1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /**************************************************************************/ 3 /* */ 4 /* IBM System i and System p Virtual NIC Device Driver */ 5 /* Copyright (C) 2014 IBM Corp. */ 6 /* Santiago Leon (santi_leon@yahoo.com) */ 7 /* Thomas Falcon (tlfalcon@linux.vnet.ibm.com) */ 8 /* John Allen (jallen@linux.vnet.ibm.com) */ 9 /* */ 10 /* */ 11 /* This module contains the implementation of a virtual ethernet device */ 12 /* for use with IBM i/p Series LPAR Linux. It utilizes the logical LAN */ 13 /* option of the RS/6000 Platform Architecture to interface with virtual */ 14 /* ethernet NICs that are presented to the partition by the hypervisor. */ 15 /* */ 16 /* Messages are passed between the VNIC driver and the VNIC server using */ 17 /* Command/Response Queues (CRQs) and sub CRQs (sCRQs). CRQs are used to */ 18 /* issue and receive commands that initiate communication with the server */ 19 /* on driver initialization. Sub CRQs (sCRQs) are similar to CRQs, but */ 20 /* are used by the driver to notify the server that a packet is */ 21 /* ready for transmission or that a buffer has been added to receive a */ 22 /* packet. Subsequently, sCRQs are used by the server to notify the */ 23 /* driver that a packet transmission has been completed or that a packet */ 24 /* has been received and placed in a waiting buffer. */ 25 /* */ 26 /* In lieu of a more conventional "on-the-fly" DMA mapping strategy in */ 27 /* which skbs are DMA mapped and immediately unmapped when the transmit */ 28 /* or receive has been completed, the VNIC driver is required to use */ 29 /* "long term mapping". This entails that large, continuous DMA mapped */ 30 /* buffers are allocated on driver initialization and these buffers are */ 31 /* then continuously reused to pass skbs to and from the VNIC server. */ 32 /* */ 33 /**************************************************************************/ 34 35 #include <linux/module.h> 36 #include <linux/moduleparam.h> 37 #include <linux/types.h> 38 #include <linux/errno.h> 39 #include <linux/completion.h> 40 #include <linux/ioport.h> 41 #include <linux/dma-mapping.h> 42 #include <linux/kernel.h> 43 #include <linux/netdevice.h> 44 #include <linux/etherdevice.h> 45 #include <linux/skbuff.h> 46 #include <linux/init.h> 47 #include <linux/delay.h> 48 #include <linux/mm.h> 49 #include <linux/ethtool.h> 50 #include <linux/proc_fs.h> 51 #include <linux/if_arp.h> 52 #include <linux/in.h> 53 #include <linux/ip.h> 54 #include <linux/ipv6.h> 55 #include <linux/irq.h> 56 #include <linux/irqdomain.h> 57 #include <linux/kthread.h> 58 #include <linux/seq_file.h> 59 #include <linux/interrupt.h> 60 #include <net/net_namespace.h> 61 #include <asm/hvcall.h> 62 #include <linux/atomic.h> 63 #include <asm/vio.h> 64 #include <asm/xive.h> 65 #include <asm/iommu.h> 66 #include <linux/uaccess.h> 67 #include <asm/firmware.h> 68 #include <linux/workqueue.h> 69 #include <linux/if_vlan.h> 70 #include <linux/utsname.h> 71 #include <linux/cpu.h> 72 73 #include "ibmvnic.h" 74 75 static const char ibmvnic_driver_name[] = "ibmvnic"; 76 static const char ibmvnic_driver_string[] = "IBM System i/p Virtual NIC Driver"; 77 78 MODULE_AUTHOR("Santiago Leon"); 79 MODULE_DESCRIPTION("IBM System i/p Virtual NIC Driver"); 80 MODULE_LICENSE("GPL"); 81 MODULE_VERSION(IBMVNIC_DRIVER_VERSION); 82 83 static int ibmvnic_version = IBMVNIC_INITIAL_VERSION; 84 static void release_sub_crqs(struct ibmvnic_adapter *, bool); 85 static int ibmvnic_reset_crq(struct ibmvnic_adapter *); 86 static int ibmvnic_send_crq_init(struct ibmvnic_adapter *); 87 static int ibmvnic_reenable_crq_queue(struct ibmvnic_adapter *); 88 static int ibmvnic_send_crq(struct ibmvnic_adapter *, union ibmvnic_crq *); 89 static int send_subcrq_indirect(struct ibmvnic_adapter *, u64, u64, u64); 90 static irqreturn_t ibmvnic_interrupt_rx(int irq, void *instance); 91 static int enable_scrq_irq(struct ibmvnic_adapter *, 92 struct ibmvnic_sub_crq_queue *); 93 static int disable_scrq_irq(struct ibmvnic_adapter *, 94 struct ibmvnic_sub_crq_queue *); 95 static int pending_scrq(struct ibmvnic_adapter *, 96 struct ibmvnic_sub_crq_queue *); 97 static union sub_crq *ibmvnic_next_scrq(struct ibmvnic_adapter *, 98 struct ibmvnic_sub_crq_queue *); 99 static int ibmvnic_poll(struct napi_struct *napi, int data); 100 static void send_query_map(struct ibmvnic_adapter *adapter); 101 static int send_request_map(struct ibmvnic_adapter *, dma_addr_t, u32, u8); 102 static int send_request_unmap(struct ibmvnic_adapter *, u8); 103 static int send_login(struct ibmvnic_adapter *adapter); 104 static void send_query_cap(struct ibmvnic_adapter *adapter); 105 static int init_sub_crqs(struct ibmvnic_adapter *); 106 static int init_sub_crq_irqs(struct ibmvnic_adapter *adapter); 107 static int ibmvnic_reset_init(struct ibmvnic_adapter *, bool reset); 108 static void release_crq_queue(struct ibmvnic_adapter *); 109 static int __ibmvnic_set_mac(struct net_device *, u8 *); 110 static int init_crq_queue(struct ibmvnic_adapter *adapter); 111 static int send_query_phys_parms(struct ibmvnic_adapter *adapter); 112 static void ibmvnic_tx_scrq_clean_buffer(struct ibmvnic_adapter *adapter, 113 struct ibmvnic_sub_crq_queue *tx_scrq); 114 static void free_long_term_buff(struct ibmvnic_adapter *adapter, 115 struct ibmvnic_long_term_buff *ltb); 116 static void ibmvnic_disable_irqs(struct ibmvnic_adapter *adapter); 117 118 struct ibmvnic_stat { 119 char name[ETH_GSTRING_LEN]; 120 int offset; 121 }; 122 123 #define IBMVNIC_STAT_OFF(stat) (offsetof(struct ibmvnic_adapter, stats) + \ 124 offsetof(struct ibmvnic_statistics, stat)) 125 #define IBMVNIC_GET_STAT(a, off) (*((u64 *)(((unsigned long)(a)) + (off)))) 126 127 static const struct ibmvnic_stat ibmvnic_stats[] = { 128 {"rx_packets", IBMVNIC_STAT_OFF(rx_packets)}, 129 {"rx_bytes", IBMVNIC_STAT_OFF(rx_bytes)}, 130 {"tx_packets", IBMVNIC_STAT_OFF(tx_packets)}, 131 {"tx_bytes", IBMVNIC_STAT_OFF(tx_bytes)}, 132 {"ucast_tx_packets", IBMVNIC_STAT_OFF(ucast_tx_packets)}, 133 {"ucast_rx_packets", IBMVNIC_STAT_OFF(ucast_rx_packets)}, 134 {"mcast_tx_packets", IBMVNIC_STAT_OFF(mcast_tx_packets)}, 135 {"mcast_rx_packets", IBMVNIC_STAT_OFF(mcast_rx_packets)}, 136 {"bcast_tx_packets", IBMVNIC_STAT_OFF(bcast_tx_packets)}, 137 {"bcast_rx_packets", IBMVNIC_STAT_OFF(bcast_rx_packets)}, 138 {"align_errors", IBMVNIC_STAT_OFF(align_errors)}, 139 {"fcs_errors", IBMVNIC_STAT_OFF(fcs_errors)}, 140 {"single_collision_frames", IBMVNIC_STAT_OFF(single_collision_frames)}, 141 {"multi_collision_frames", IBMVNIC_STAT_OFF(multi_collision_frames)}, 142 {"sqe_test_errors", IBMVNIC_STAT_OFF(sqe_test_errors)}, 143 {"deferred_tx", IBMVNIC_STAT_OFF(deferred_tx)}, 144 {"late_collisions", IBMVNIC_STAT_OFF(late_collisions)}, 145 {"excess_collisions", IBMVNIC_STAT_OFF(excess_collisions)}, 146 {"internal_mac_tx_errors", IBMVNIC_STAT_OFF(internal_mac_tx_errors)}, 147 {"carrier_sense", IBMVNIC_STAT_OFF(carrier_sense)}, 148 {"too_long_frames", IBMVNIC_STAT_OFF(too_long_frames)}, 149 {"internal_mac_rx_errors", IBMVNIC_STAT_OFF(internal_mac_rx_errors)}, 150 }; 151 152 static int send_crq_init_complete(struct ibmvnic_adapter *adapter) 153 { 154 union ibmvnic_crq crq; 155 156 memset(&crq, 0, sizeof(crq)); 157 crq.generic.first = IBMVNIC_CRQ_INIT_CMD; 158 crq.generic.cmd = IBMVNIC_CRQ_INIT_COMPLETE; 159 160 return ibmvnic_send_crq(adapter, &crq); 161 } 162 163 static int send_version_xchg(struct ibmvnic_adapter *adapter) 164 { 165 union ibmvnic_crq crq; 166 167 memset(&crq, 0, sizeof(crq)); 168 crq.version_exchange.first = IBMVNIC_CRQ_CMD; 169 crq.version_exchange.cmd = VERSION_EXCHANGE; 170 crq.version_exchange.version = cpu_to_be16(ibmvnic_version); 171 172 return ibmvnic_send_crq(adapter, &crq); 173 } 174 175 static void ibmvnic_clean_queue_affinity(struct ibmvnic_adapter *adapter, 176 struct ibmvnic_sub_crq_queue *queue) 177 { 178 if (!(queue && queue->irq)) 179 return; 180 181 cpumask_clear(queue->affinity_mask); 182 183 if (irq_set_affinity_and_hint(queue->irq, NULL)) 184 netdev_warn(adapter->netdev, 185 "%s: Clear affinity failed, queue addr = %p, IRQ = %d\n", 186 __func__, queue, queue->irq); 187 } 188 189 static void ibmvnic_clean_affinity(struct ibmvnic_adapter *adapter) 190 { 191 struct ibmvnic_sub_crq_queue **rxqs; 192 struct ibmvnic_sub_crq_queue **txqs; 193 int num_rxqs, num_txqs; 194 int rc, i; 195 196 rc = 0; 197 rxqs = adapter->rx_scrq; 198 txqs = adapter->tx_scrq; 199 num_txqs = adapter->num_active_tx_scrqs; 200 num_rxqs = adapter->num_active_rx_scrqs; 201 202 netdev_dbg(adapter->netdev, "%s: Cleaning irq affinity hints", __func__); 203 if (txqs) { 204 for (i = 0; i < num_txqs; i++) 205 ibmvnic_clean_queue_affinity(adapter, txqs[i]); 206 } 207 if (rxqs) { 208 for (i = 0; i < num_rxqs; i++) 209 ibmvnic_clean_queue_affinity(adapter, rxqs[i]); 210 } 211 } 212 213 static int ibmvnic_set_queue_affinity(struct ibmvnic_sub_crq_queue *queue, 214 unsigned int *cpu, int *stragglers, 215 int stride) 216 { 217 cpumask_var_t mask; 218 int i; 219 int rc = 0; 220 221 if (!(queue && queue->irq)) 222 return rc; 223 224 /* cpumask_var_t is either a pointer or array, allocation works here */ 225 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) 226 return -ENOMEM; 227 228 /* while we have extra cpu give one extra to this irq */ 229 if (*stragglers) { 230 stride++; 231 (*stragglers)--; 232 } 233 /* atomic write is safer than writing bit by bit directly */ 234 for (i = 0; i < stride; i++) { 235 cpumask_set_cpu(*cpu, mask); 236 *cpu = cpumask_next_wrap(*cpu, cpu_online_mask, 237 nr_cpu_ids, false); 238 } 239 /* set queue affinity mask */ 240 cpumask_copy(queue->affinity_mask, mask); 241 rc = irq_set_affinity_and_hint(queue->irq, queue->affinity_mask); 242 free_cpumask_var(mask); 243 244 return rc; 245 } 246 247 /* assumes cpu read lock is held */ 248 static void ibmvnic_set_affinity(struct ibmvnic_adapter *adapter) 249 { 250 struct ibmvnic_sub_crq_queue **rxqs = adapter->rx_scrq; 251 struct ibmvnic_sub_crq_queue **txqs = adapter->tx_scrq; 252 struct ibmvnic_sub_crq_queue *queue; 253 int num_rxqs = adapter->num_active_rx_scrqs, i_rxqs = 0; 254 int num_txqs = adapter->num_active_tx_scrqs, i_txqs = 0; 255 int total_queues, stride, stragglers, i; 256 unsigned int num_cpu, cpu; 257 bool is_rx_queue; 258 int rc = 0; 259 260 netdev_dbg(adapter->netdev, "%s: Setting irq affinity hints", __func__); 261 if (!(adapter->rx_scrq && adapter->tx_scrq)) { 262 netdev_warn(adapter->netdev, 263 "%s: Set affinity failed, queues not allocated\n", 264 __func__); 265 return; 266 } 267 268 total_queues = num_rxqs + num_txqs; 269 num_cpu = num_online_cpus(); 270 /* number of cpu's assigned per irq */ 271 stride = max_t(int, num_cpu / total_queues, 1); 272 /* number of leftover cpu's */ 273 stragglers = num_cpu >= total_queues ? num_cpu % total_queues : 0; 274 /* next available cpu to assign irq to */ 275 cpu = cpumask_next(-1, cpu_online_mask); 276 277 for (i = 0; i < total_queues; i++) { 278 is_rx_queue = false; 279 /* balance core load by alternating rx and tx assignments 280 * ex: TX0 -> RX0 -> TX1 -> RX1 etc. 281 */ 282 if ((i % 2 == 1 && i_rxqs < num_rxqs) || i_txqs == num_txqs) { 283 queue = rxqs[i_rxqs++]; 284 is_rx_queue = true; 285 } else { 286 queue = txqs[i_txqs++]; 287 } 288 289 rc = ibmvnic_set_queue_affinity(queue, &cpu, &stragglers, 290 stride); 291 if (rc) 292 goto out; 293 294 if (!queue || is_rx_queue) 295 continue; 296 297 rc = __netif_set_xps_queue(adapter->netdev, 298 cpumask_bits(queue->affinity_mask), 299 i_txqs - 1, XPS_CPUS); 300 if (rc) 301 netdev_warn(adapter->netdev, "%s: Set XPS on queue %d failed, rc = %d.\n", 302 __func__, i_txqs - 1, rc); 303 } 304 305 out: 306 if (rc) { 307 netdev_warn(adapter->netdev, 308 "%s: Set affinity failed, queue addr = %p, IRQ = %d, rc = %d.\n", 309 __func__, queue, queue->irq, rc); 310 ibmvnic_clean_affinity(adapter); 311 } 312 } 313 314 static int ibmvnic_cpu_online(unsigned int cpu, struct hlist_node *node) 315 { 316 struct ibmvnic_adapter *adapter; 317 318 adapter = hlist_entry_safe(node, struct ibmvnic_adapter, node); 319 ibmvnic_set_affinity(adapter); 320 return 0; 321 } 322 323 static int ibmvnic_cpu_dead(unsigned int cpu, struct hlist_node *node) 324 { 325 struct ibmvnic_adapter *adapter; 326 327 adapter = hlist_entry_safe(node, struct ibmvnic_adapter, node_dead); 328 ibmvnic_set_affinity(adapter); 329 return 0; 330 } 331 332 static int ibmvnic_cpu_down_prep(unsigned int cpu, struct hlist_node *node) 333 { 334 struct ibmvnic_adapter *adapter; 335 336 adapter = hlist_entry_safe(node, struct ibmvnic_adapter, node); 337 ibmvnic_clean_affinity(adapter); 338 return 0; 339 } 340 341 static enum cpuhp_state ibmvnic_online; 342 343 static int ibmvnic_cpu_notif_add(struct ibmvnic_adapter *adapter) 344 { 345 int ret; 346 347 ret = cpuhp_state_add_instance_nocalls(ibmvnic_online, &adapter->node); 348 if (ret) 349 return ret; 350 ret = cpuhp_state_add_instance_nocalls(CPUHP_IBMVNIC_DEAD, 351 &adapter->node_dead); 352 if (!ret) 353 return ret; 354 cpuhp_state_remove_instance_nocalls(ibmvnic_online, &adapter->node); 355 return ret; 356 } 357 358 static void ibmvnic_cpu_notif_remove(struct ibmvnic_adapter *adapter) 359 { 360 cpuhp_state_remove_instance_nocalls(ibmvnic_online, &adapter->node); 361 cpuhp_state_remove_instance_nocalls(CPUHP_IBMVNIC_DEAD, 362 &adapter->node_dead); 363 } 364 365 static long h_reg_sub_crq(unsigned long unit_address, unsigned long token, 366 unsigned long length, unsigned long *number, 367 unsigned long *irq) 368 { 369 unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; 370 long rc; 371 372 rc = plpar_hcall(H_REG_SUB_CRQ, retbuf, unit_address, token, length); 373 *number = retbuf[0]; 374 *irq = retbuf[1]; 375 376 return rc; 377 } 378 379 /** 380 * ibmvnic_wait_for_completion - Check device state and wait for completion 381 * @adapter: private device data 382 * @comp_done: completion structure to wait for 383 * @timeout: time to wait in milliseconds 384 * 385 * Wait for a completion signal or until the timeout limit is reached 386 * while checking that the device is still active. 387 */ 388 static int ibmvnic_wait_for_completion(struct ibmvnic_adapter *adapter, 389 struct completion *comp_done, 390 unsigned long timeout) 391 { 392 struct net_device *netdev; 393 unsigned long div_timeout; 394 u8 retry; 395 396 netdev = adapter->netdev; 397 retry = 5; 398 div_timeout = msecs_to_jiffies(timeout / retry); 399 while (true) { 400 if (!adapter->crq.active) { 401 netdev_err(netdev, "Device down!\n"); 402 return -ENODEV; 403 } 404 if (!retry--) 405 break; 406 if (wait_for_completion_timeout(comp_done, div_timeout)) 407 return 0; 408 } 409 netdev_err(netdev, "Operation timed out.\n"); 410 return -ETIMEDOUT; 411 } 412 413 /** 414 * reuse_ltb() - Check if a long term buffer can be reused 415 * @ltb: The long term buffer to be checked 416 * @size: The size of the long term buffer. 417 * 418 * An LTB can be reused unless its size has changed. 419 * 420 * Return: Return true if the LTB can be reused, false otherwise. 421 */ 422 static bool reuse_ltb(struct ibmvnic_long_term_buff *ltb, int size) 423 { 424 return (ltb->buff && ltb->size == size); 425 } 426 427 /** 428 * alloc_long_term_buff() - Allocate a long term buffer (LTB) 429 * 430 * @adapter: ibmvnic adapter associated to the LTB 431 * @ltb: container object for the LTB 432 * @size: size of the LTB 433 * 434 * Allocate an LTB of the specified size and notify VIOS. 435 * 436 * If the given @ltb already has the correct size, reuse it. Otherwise if 437 * its non-NULL, free it. Then allocate a new one of the correct size. 438 * Notify the VIOS either way since we may now be working with a new VIOS. 439 * 440 * Allocating larger chunks of memory during resets, specially LPM or under 441 * low memory situations can cause resets to fail/timeout and for LPAR to 442 * lose connectivity. So hold onto the LTB even if we fail to communicate 443 * with the VIOS and reuse it on next open. Free LTB when adapter is closed. 444 * 445 * Return: 0 if we were able to allocate the LTB and notify the VIOS and 446 * a negative value otherwise. 447 */ 448 static int alloc_long_term_buff(struct ibmvnic_adapter *adapter, 449 struct ibmvnic_long_term_buff *ltb, int size) 450 { 451 struct device *dev = &adapter->vdev->dev; 452 u64 prev = 0; 453 int rc; 454 455 if (!reuse_ltb(ltb, size)) { 456 dev_dbg(dev, 457 "LTB size changed from 0x%llx to 0x%x, reallocating\n", 458 ltb->size, size); 459 prev = ltb->size; 460 free_long_term_buff(adapter, ltb); 461 } 462 463 if (ltb->buff) { 464 dev_dbg(dev, "Reusing LTB [map %d, size 0x%llx]\n", 465 ltb->map_id, ltb->size); 466 } else { 467 ltb->buff = dma_alloc_coherent(dev, size, <b->addr, 468 GFP_KERNEL); 469 if (!ltb->buff) { 470 dev_err(dev, "Couldn't alloc long term buffer\n"); 471 return -ENOMEM; 472 } 473 ltb->size = size; 474 475 ltb->map_id = find_first_zero_bit(adapter->map_ids, 476 MAX_MAP_ID); 477 bitmap_set(adapter->map_ids, ltb->map_id, 1); 478 479 dev_dbg(dev, 480 "Allocated new LTB [map %d, size 0x%llx was 0x%llx]\n", 481 ltb->map_id, ltb->size, prev); 482 } 483 484 /* Ensure ltb is zeroed - specially when reusing it. */ 485 memset(ltb->buff, 0, ltb->size); 486 487 mutex_lock(&adapter->fw_lock); 488 adapter->fw_done_rc = 0; 489 reinit_completion(&adapter->fw_done); 490 491 rc = send_request_map(adapter, ltb->addr, ltb->size, ltb->map_id); 492 if (rc) { 493 dev_err(dev, "send_request_map failed, rc = %d\n", rc); 494 goto out; 495 } 496 497 rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000); 498 if (rc) { 499 dev_err(dev, "LTB map request aborted or timed out, rc = %d\n", 500 rc); 501 goto out; 502 } 503 504 if (adapter->fw_done_rc) { 505 dev_err(dev, "Couldn't map LTB, rc = %d\n", 506 adapter->fw_done_rc); 507 rc = -EIO; 508 goto out; 509 } 510 rc = 0; 511 out: 512 /* don't free LTB on communication error - see function header */ 513 mutex_unlock(&adapter->fw_lock); 514 return rc; 515 } 516 517 static void free_long_term_buff(struct ibmvnic_adapter *adapter, 518 struct ibmvnic_long_term_buff *ltb) 519 { 520 struct device *dev = &adapter->vdev->dev; 521 522 if (!ltb->buff) 523 return; 524 525 /* VIOS automatically unmaps the long term buffer at remote 526 * end for the following resets: 527 * FAILOVER, MOBILITY, TIMEOUT. 528 */ 529 if (adapter->reset_reason != VNIC_RESET_FAILOVER && 530 adapter->reset_reason != VNIC_RESET_MOBILITY && 531 adapter->reset_reason != VNIC_RESET_TIMEOUT) 532 send_request_unmap(adapter, ltb->map_id); 533 534 dma_free_coherent(dev, ltb->size, ltb->buff, ltb->addr); 535 536 ltb->buff = NULL; 537 /* mark this map_id free */ 538 bitmap_clear(adapter->map_ids, ltb->map_id, 1); 539 ltb->map_id = 0; 540 } 541 542 /** 543 * free_ltb_set - free the given set of long term buffers (LTBS) 544 * @adapter: The ibmvnic adapter containing this ltb set 545 * @ltb_set: The ltb_set to be freed 546 * 547 * Free the set of LTBs in the given set. 548 */ 549 550 static void free_ltb_set(struct ibmvnic_adapter *adapter, 551 struct ibmvnic_ltb_set *ltb_set) 552 { 553 int i; 554 555 for (i = 0; i < ltb_set->num_ltbs; i++) 556 free_long_term_buff(adapter, <b_set->ltbs[i]); 557 558 kfree(ltb_set->ltbs); 559 ltb_set->ltbs = NULL; 560 ltb_set->num_ltbs = 0; 561 } 562 563 /** 564 * alloc_ltb_set() - Allocate a set of long term buffers (LTBs) 565 * 566 * @adapter: ibmvnic adapter associated to the LTB 567 * @ltb_set: container object for the set of LTBs 568 * @num_buffs: Number of buffers in the LTB 569 * @buff_size: Size of each buffer in the LTB 570 * 571 * Allocate a set of LTBs to accommodate @num_buffs buffers of @buff_size 572 * each. We currently cap size each LTB to IBMVNIC_ONE_LTB_SIZE. If the 573 * new set of LTBs have fewer LTBs than the old set, free the excess LTBs. 574 * If new set needs more than in old set, allocate the remaining ones. 575 * Try and reuse as many LTBs as possible and avoid reallocation. 576 * 577 * Any changes to this allocation strategy must be reflected in 578 * map_rxpool_buff_to_ltb() and map_txpool_buff_to_ltb(). 579 */ 580 static int alloc_ltb_set(struct ibmvnic_adapter *adapter, 581 struct ibmvnic_ltb_set *ltb_set, int num_buffs, 582 int buff_size) 583 { 584 struct device *dev = &adapter->vdev->dev; 585 struct ibmvnic_ltb_set old_set; 586 struct ibmvnic_ltb_set new_set; 587 int rem_size; 588 int tot_size; /* size of all ltbs */ 589 int ltb_size; /* size of one ltb */ 590 int nltbs; 591 int rc; 592 int n; 593 int i; 594 595 dev_dbg(dev, "%s() num_buffs %d, buff_size %d\n", __func__, num_buffs, 596 buff_size); 597 598 ltb_size = rounddown(IBMVNIC_ONE_LTB_SIZE, buff_size); 599 tot_size = num_buffs * buff_size; 600 601 if (ltb_size > tot_size) 602 ltb_size = tot_size; 603 604 nltbs = tot_size / ltb_size; 605 if (tot_size % ltb_size) 606 nltbs++; 607 608 old_set = *ltb_set; 609 610 if (old_set.num_ltbs == nltbs) { 611 new_set = old_set; 612 } else { 613 int tmp = nltbs * sizeof(struct ibmvnic_long_term_buff); 614 615 new_set.ltbs = kzalloc(tmp, GFP_KERNEL); 616 if (!new_set.ltbs) 617 return -ENOMEM; 618 619 new_set.num_ltbs = nltbs; 620 621 /* Free any excess ltbs in old set */ 622 for (i = new_set.num_ltbs; i < old_set.num_ltbs; i++) 623 free_long_term_buff(adapter, &old_set.ltbs[i]); 624 625 /* Copy remaining ltbs to new set. All LTBs except the 626 * last one are of the same size. alloc_long_term_buff() 627 * will realloc if the size changes. 628 */ 629 n = min(old_set.num_ltbs, new_set.num_ltbs); 630 for (i = 0; i < n; i++) 631 new_set.ltbs[i] = old_set.ltbs[i]; 632 633 /* Any additional ltbs in new set will have NULL ltbs for 634 * now and will be allocated in alloc_long_term_buff(). 635 */ 636 637 /* We no longer need the old_set so free it. Note that we 638 * may have reused some ltbs from old set and freed excess 639 * ltbs above. So we only need to free the container now 640 * not the LTBs themselves. (i.e. dont free_ltb_set()!) 641 */ 642 kfree(old_set.ltbs); 643 old_set.ltbs = NULL; 644 old_set.num_ltbs = 0; 645 646 /* Install the new set. If allocations fail below, we will 647 * retry later and know what size LTBs we need. 648 */ 649 *ltb_set = new_set; 650 } 651 652 i = 0; 653 rem_size = tot_size; 654 while (rem_size) { 655 if (ltb_size > rem_size) 656 ltb_size = rem_size; 657 658 rem_size -= ltb_size; 659 660 rc = alloc_long_term_buff(adapter, &new_set.ltbs[i], ltb_size); 661 if (rc) 662 goto out; 663 i++; 664 } 665 666 WARN_ON(i != new_set.num_ltbs); 667 668 return 0; 669 out: 670 /* We may have allocated one/more LTBs before failing and we 671 * want to try and reuse on next reset. So don't free ltb set. 672 */ 673 return rc; 674 } 675 676 /** 677 * map_rxpool_buf_to_ltb - Map given rxpool buffer to offset in an LTB. 678 * @rxpool: The receive buffer pool containing buffer 679 * @bufidx: Index of buffer in rxpool 680 * @ltbp: (Output) pointer to the long term buffer containing the buffer 681 * @offset: (Output) offset of buffer in the LTB from @ltbp 682 * 683 * Map the given buffer identified by [rxpool, bufidx] to an LTB in the 684 * pool and its corresponding offset. Assume for now that each LTB is of 685 * different size but could possibly be optimized based on the allocation 686 * strategy in alloc_ltb_set(). 687 */ 688 static void map_rxpool_buf_to_ltb(struct ibmvnic_rx_pool *rxpool, 689 unsigned int bufidx, 690 struct ibmvnic_long_term_buff **ltbp, 691 unsigned int *offset) 692 { 693 struct ibmvnic_long_term_buff *ltb; 694 int nbufs; /* # of buffers in one ltb */ 695 int i; 696 697 WARN_ON(bufidx >= rxpool->size); 698 699 for (i = 0; i < rxpool->ltb_set.num_ltbs; i++) { 700 ltb = &rxpool->ltb_set.ltbs[i]; 701 nbufs = ltb->size / rxpool->buff_size; 702 if (bufidx < nbufs) 703 break; 704 bufidx -= nbufs; 705 } 706 707 *ltbp = ltb; 708 *offset = bufidx * rxpool->buff_size; 709 } 710 711 /** 712 * map_txpool_buf_to_ltb - Map given txpool buffer to offset in an LTB. 713 * @txpool: The transmit buffer pool containing buffer 714 * @bufidx: Index of buffer in txpool 715 * @ltbp: (Output) pointer to the long term buffer (LTB) containing the buffer 716 * @offset: (Output) offset of buffer in the LTB from @ltbp 717 * 718 * Map the given buffer identified by [txpool, bufidx] to an LTB in the 719 * pool and its corresponding offset. 720 */ 721 static void map_txpool_buf_to_ltb(struct ibmvnic_tx_pool *txpool, 722 unsigned int bufidx, 723 struct ibmvnic_long_term_buff **ltbp, 724 unsigned int *offset) 725 { 726 struct ibmvnic_long_term_buff *ltb; 727 int nbufs; /* # of buffers in one ltb */ 728 int i; 729 730 WARN_ON_ONCE(bufidx >= txpool->num_buffers); 731 732 for (i = 0; i < txpool->ltb_set.num_ltbs; i++) { 733 ltb = &txpool->ltb_set.ltbs[i]; 734 nbufs = ltb->size / txpool->buf_size; 735 if (bufidx < nbufs) 736 break; 737 bufidx -= nbufs; 738 } 739 740 *ltbp = ltb; 741 *offset = bufidx * txpool->buf_size; 742 } 743 744 static void deactivate_rx_pools(struct ibmvnic_adapter *adapter) 745 { 746 int i; 747 748 for (i = 0; i < adapter->num_active_rx_pools; i++) 749 adapter->rx_pool[i].active = 0; 750 } 751 752 static void replenish_rx_pool(struct ibmvnic_adapter *adapter, 753 struct ibmvnic_rx_pool *pool) 754 { 755 int count = pool->size - atomic_read(&pool->available); 756 u64 handle = adapter->rx_scrq[pool->index]->handle; 757 struct device *dev = &adapter->vdev->dev; 758 struct ibmvnic_ind_xmit_queue *ind_bufp; 759 struct ibmvnic_sub_crq_queue *rx_scrq; 760 struct ibmvnic_long_term_buff *ltb; 761 union sub_crq *sub_crq; 762 int buffers_added = 0; 763 unsigned long lpar_rc; 764 struct sk_buff *skb; 765 unsigned int offset; 766 dma_addr_t dma_addr; 767 unsigned char *dst; 768 int shift = 0; 769 int bufidx; 770 int i; 771 772 if (!pool->active) 773 return; 774 775 rx_scrq = adapter->rx_scrq[pool->index]; 776 ind_bufp = &rx_scrq->ind_buf; 777 778 /* netdev_skb_alloc() could have failed after we saved a few skbs 779 * in the indir_buf and we would not have sent them to VIOS yet. 780 * To account for them, start the loop at ind_bufp->index rather 781 * than 0. If we pushed all the skbs to VIOS, ind_bufp->index will 782 * be 0. 783 */ 784 for (i = ind_bufp->index; i < count; ++i) { 785 bufidx = pool->free_map[pool->next_free]; 786 787 /* We maybe reusing the skb from earlier resets. Allocate 788 * only if necessary. But since the LTB may have changed 789 * during reset (see init_rx_pools()), update LTB below 790 * even if reusing skb. 791 */ 792 skb = pool->rx_buff[bufidx].skb; 793 if (!skb) { 794 skb = netdev_alloc_skb(adapter->netdev, 795 pool->buff_size); 796 if (!skb) { 797 dev_err(dev, "Couldn't replenish rx buff\n"); 798 adapter->replenish_no_mem++; 799 break; 800 } 801 } 802 803 pool->free_map[pool->next_free] = IBMVNIC_INVALID_MAP; 804 pool->next_free = (pool->next_free + 1) % pool->size; 805 806 /* Copy the skb to the long term mapped DMA buffer */ 807 map_rxpool_buf_to_ltb(pool, bufidx, <b, &offset); 808 dst = ltb->buff + offset; 809 memset(dst, 0, pool->buff_size); 810 dma_addr = ltb->addr + offset; 811 812 /* add the skb to an rx_buff in the pool */ 813 pool->rx_buff[bufidx].data = dst; 814 pool->rx_buff[bufidx].dma = dma_addr; 815 pool->rx_buff[bufidx].skb = skb; 816 pool->rx_buff[bufidx].pool_index = pool->index; 817 pool->rx_buff[bufidx].size = pool->buff_size; 818 819 /* queue the rx_buff for the next send_subcrq_indirect */ 820 sub_crq = &ind_bufp->indir_arr[ind_bufp->index++]; 821 memset(sub_crq, 0, sizeof(*sub_crq)); 822 sub_crq->rx_add.first = IBMVNIC_CRQ_CMD; 823 sub_crq->rx_add.correlator = 824 cpu_to_be64((u64)&pool->rx_buff[bufidx]); 825 sub_crq->rx_add.ioba = cpu_to_be32(dma_addr); 826 sub_crq->rx_add.map_id = ltb->map_id; 827 828 /* The length field of the sCRQ is defined to be 24 bits so the 829 * buffer size needs to be left shifted by a byte before it is 830 * converted to big endian to prevent the last byte from being 831 * truncated. 832 */ 833 #ifdef __LITTLE_ENDIAN__ 834 shift = 8; 835 #endif 836 sub_crq->rx_add.len = cpu_to_be32(pool->buff_size << shift); 837 838 /* if send_subcrq_indirect queue is full, flush to VIOS */ 839 if (ind_bufp->index == IBMVNIC_MAX_IND_DESCS || 840 i == count - 1) { 841 lpar_rc = 842 send_subcrq_indirect(adapter, handle, 843 (u64)ind_bufp->indir_dma, 844 (u64)ind_bufp->index); 845 if (lpar_rc != H_SUCCESS) 846 goto failure; 847 buffers_added += ind_bufp->index; 848 adapter->replenish_add_buff_success += ind_bufp->index; 849 ind_bufp->index = 0; 850 } 851 } 852 atomic_add(buffers_added, &pool->available); 853 return; 854 855 failure: 856 if (lpar_rc != H_PARAMETER && lpar_rc != H_CLOSED) 857 dev_err_ratelimited(dev, "rx: replenish packet buffer failed\n"); 858 for (i = ind_bufp->index - 1; i >= 0; --i) { 859 struct ibmvnic_rx_buff *rx_buff; 860 861 pool->next_free = pool->next_free == 0 ? 862 pool->size - 1 : pool->next_free - 1; 863 sub_crq = &ind_bufp->indir_arr[i]; 864 rx_buff = (struct ibmvnic_rx_buff *) 865 be64_to_cpu(sub_crq->rx_add.correlator); 866 bufidx = (int)(rx_buff - pool->rx_buff); 867 pool->free_map[pool->next_free] = bufidx; 868 dev_kfree_skb_any(pool->rx_buff[bufidx].skb); 869 pool->rx_buff[bufidx].skb = NULL; 870 } 871 adapter->replenish_add_buff_failure += ind_bufp->index; 872 atomic_add(buffers_added, &pool->available); 873 ind_bufp->index = 0; 874 if (lpar_rc == H_CLOSED || adapter->failover_pending) { 875 /* Disable buffer pool replenishment and report carrier off if 876 * queue is closed or pending failover. 877 * Firmware guarantees that a signal will be sent to the 878 * driver, triggering a reset. 879 */ 880 deactivate_rx_pools(adapter); 881 netif_carrier_off(adapter->netdev); 882 } 883 } 884 885 static void replenish_pools(struct ibmvnic_adapter *adapter) 886 { 887 int i; 888 889 adapter->replenish_task_cycles++; 890 for (i = 0; i < adapter->num_active_rx_pools; i++) { 891 if (adapter->rx_pool[i].active) 892 replenish_rx_pool(adapter, &adapter->rx_pool[i]); 893 } 894 895 netdev_dbg(adapter->netdev, "Replenished %d pools\n", i); 896 } 897 898 static void release_stats_buffers(struct ibmvnic_adapter *adapter) 899 { 900 kfree(adapter->tx_stats_buffers); 901 kfree(adapter->rx_stats_buffers); 902 adapter->tx_stats_buffers = NULL; 903 adapter->rx_stats_buffers = NULL; 904 } 905 906 static int init_stats_buffers(struct ibmvnic_adapter *adapter) 907 { 908 adapter->tx_stats_buffers = 909 kcalloc(IBMVNIC_MAX_QUEUES, 910 sizeof(struct ibmvnic_tx_queue_stats), 911 GFP_KERNEL); 912 if (!adapter->tx_stats_buffers) 913 return -ENOMEM; 914 915 adapter->rx_stats_buffers = 916 kcalloc(IBMVNIC_MAX_QUEUES, 917 sizeof(struct ibmvnic_rx_queue_stats), 918 GFP_KERNEL); 919 if (!adapter->rx_stats_buffers) 920 return -ENOMEM; 921 922 return 0; 923 } 924 925 static void release_stats_token(struct ibmvnic_adapter *adapter) 926 { 927 struct device *dev = &adapter->vdev->dev; 928 929 if (!adapter->stats_token) 930 return; 931 932 dma_unmap_single(dev, adapter->stats_token, 933 sizeof(struct ibmvnic_statistics), 934 DMA_FROM_DEVICE); 935 adapter->stats_token = 0; 936 } 937 938 static int init_stats_token(struct ibmvnic_adapter *adapter) 939 { 940 struct device *dev = &adapter->vdev->dev; 941 dma_addr_t stok; 942 int rc; 943 944 stok = dma_map_single(dev, &adapter->stats, 945 sizeof(struct ibmvnic_statistics), 946 DMA_FROM_DEVICE); 947 rc = dma_mapping_error(dev, stok); 948 if (rc) { 949 dev_err(dev, "Couldn't map stats buffer, rc = %d\n", rc); 950 return rc; 951 } 952 953 adapter->stats_token = stok; 954 netdev_dbg(adapter->netdev, "Stats token initialized (%llx)\n", stok); 955 return 0; 956 } 957 958 /** 959 * release_rx_pools() - Release any rx pools attached to @adapter. 960 * @adapter: ibmvnic adapter 961 * 962 * Safe to call this multiple times - even if no pools are attached. 963 */ 964 static void release_rx_pools(struct ibmvnic_adapter *adapter) 965 { 966 struct ibmvnic_rx_pool *rx_pool; 967 int i, j; 968 969 if (!adapter->rx_pool) 970 return; 971 972 for (i = 0; i < adapter->num_active_rx_pools; i++) { 973 rx_pool = &adapter->rx_pool[i]; 974 975 netdev_dbg(adapter->netdev, "Releasing rx_pool[%d]\n", i); 976 977 kfree(rx_pool->free_map); 978 979 free_ltb_set(adapter, &rx_pool->ltb_set); 980 981 if (!rx_pool->rx_buff) 982 continue; 983 984 for (j = 0; j < rx_pool->size; j++) { 985 if (rx_pool->rx_buff[j].skb) { 986 dev_kfree_skb_any(rx_pool->rx_buff[j].skb); 987 rx_pool->rx_buff[j].skb = NULL; 988 } 989 } 990 991 kfree(rx_pool->rx_buff); 992 } 993 994 kfree(adapter->rx_pool); 995 adapter->rx_pool = NULL; 996 adapter->num_active_rx_pools = 0; 997 adapter->prev_rx_pool_size = 0; 998 } 999 1000 /** 1001 * reuse_rx_pools() - Check if the existing rx pools can be reused. 1002 * @adapter: ibmvnic adapter 1003 * 1004 * Check if the existing rx pools in the adapter can be reused. The 1005 * pools can be reused if the pool parameters (number of pools, 1006 * number of buffers in the pool and size of each buffer) have not 1007 * changed. 1008 * 1009 * NOTE: This assumes that all pools have the same number of buffers 1010 * which is the case currently. If that changes, we must fix this. 1011 * 1012 * Return: true if the rx pools can be reused, false otherwise. 1013 */ 1014 static bool reuse_rx_pools(struct ibmvnic_adapter *adapter) 1015 { 1016 u64 old_num_pools, new_num_pools; 1017 u64 old_pool_size, new_pool_size; 1018 u64 old_buff_size, new_buff_size; 1019 1020 if (!adapter->rx_pool) 1021 return false; 1022 1023 old_num_pools = adapter->num_active_rx_pools; 1024 new_num_pools = adapter->req_rx_queues; 1025 1026 old_pool_size = adapter->prev_rx_pool_size; 1027 new_pool_size = adapter->req_rx_add_entries_per_subcrq; 1028 1029 old_buff_size = adapter->prev_rx_buf_sz; 1030 new_buff_size = adapter->cur_rx_buf_sz; 1031 1032 if (old_buff_size != new_buff_size || 1033 old_num_pools != new_num_pools || 1034 old_pool_size != new_pool_size) 1035 return false; 1036 1037 return true; 1038 } 1039 1040 /** 1041 * init_rx_pools(): Initialize the set of receiver pools in the adapter. 1042 * @netdev: net device associated with the vnic interface 1043 * 1044 * Initialize the set of receiver pools in the ibmvnic adapter associated 1045 * with the net_device @netdev. If possible, reuse the existing rx pools. 1046 * Otherwise free any existing pools and allocate a new set of pools 1047 * before initializing them. 1048 * 1049 * Return: 0 on success and negative value on error. 1050 */ 1051 static int init_rx_pools(struct net_device *netdev) 1052 { 1053 struct ibmvnic_adapter *adapter = netdev_priv(netdev); 1054 struct device *dev = &adapter->vdev->dev; 1055 struct ibmvnic_rx_pool *rx_pool; 1056 u64 num_pools; 1057 u64 pool_size; /* # of buffers in one pool */ 1058 u64 buff_size; 1059 int i, j, rc; 1060 1061 pool_size = adapter->req_rx_add_entries_per_subcrq; 1062 num_pools = adapter->req_rx_queues; 1063 buff_size = adapter->cur_rx_buf_sz; 1064 1065 if (reuse_rx_pools(adapter)) { 1066 dev_dbg(dev, "Reusing rx pools\n"); 1067 goto update_ltb; 1068 } 1069 1070 /* Allocate/populate the pools. */ 1071 release_rx_pools(adapter); 1072 1073 adapter->rx_pool = kcalloc(num_pools, 1074 sizeof(struct ibmvnic_rx_pool), 1075 GFP_KERNEL); 1076 if (!adapter->rx_pool) { 1077 dev_err(dev, "Failed to allocate rx pools\n"); 1078 return -ENOMEM; 1079 } 1080 1081 /* Set num_active_rx_pools early. If we fail below after partial 1082 * allocation, release_rx_pools() will know how many to look for. 1083 */ 1084 adapter->num_active_rx_pools = num_pools; 1085 1086 for (i = 0; i < num_pools; i++) { 1087 rx_pool = &adapter->rx_pool[i]; 1088 1089 netdev_dbg(adapter->netdev, 1090 "Initializing rx_pool[%d], %lld buffs, %lld bytes each\n", 1091 i, pool_size, buff_size); 1092 1093 rx_pool->size = pool_size; 1094 rx_pool->index = i; 1095 rx_pool->buff_size = ALIGN(buff_size, L1_CACHE_BYTES); 1096 1097 rx_pool->free_map = kcalloc(rx_pool->size, sizeof(int), 1098 GFP_KERNEL); 1099 if (!rx_pool->free_map) { 1100 dev_err(dev, "Couldn't alloc free_map %d\n", i); 1101 rc = -ENOMEM; 1102 goto out_release; 1103 } 1104 1105 rx_pool->rx_buff = kcalloc(rx_pool->size, 1106 sizeof(struct ibmvnic_rx_buff), 1107 GFP_KERNEL); 1108 if (!rx_pool->rx_buff) { 1109 dev_err(dev, "Couldn't alloc rx buffers\n"); 1110 rc = -ENOMEM; 1111 goto out_release; 1112 } 1113 } 1114 1115 adapter->prev_rx_pool_size = pool_size; 1116 adapter->prev_rx_buf_sz = adapter->cur_rx_buf_sz; 1117 1118 update_ltb: 1119 for (i = 0; i < num_pools; i++) { 1120 rx_pool = &adapter->rx_pool[i]; 1121 dev_dbg(dev, "Updating LTB for rx pool %d [%d, %d]\n", 1122 i, rx_pool->size, rx_pool->buff_size); 1123 1124 rc = alloc_ltb_set(adapter, &rx_pool->ltb_set, 1125 rx_pool->size, rx_pool->buff_size); 1126 if (rc) 1127 goto out; 1128 1129 for (j = 0; j < rx_pool->size; ++j) { 1130 struct ibmvnic_rx_buff *rx_buff; 1131 1132 rx_pool->free_map[j] = j; 1133 1134 /* NOTE: Don't clear rx_buff->skb here - will leak 1135 * memory! replenish_rx_pool() will reuse skbs or 1136 * allocate as necessary. 1137 */ 1138 rx_buff = &rx_pool->rx_buff[j]; 1139 rx_buff->dma = 0; 1140 rx_buff->data = 0; 1141 rx_buff->size = 0; 1142 rx_buff->pool_index = 0; 1143 } 1144 1145 /* Mark pool "empty" so replenish_rx_pools() will 1146 * update the LTB info for each buffer 1147 */ 1148 atomic_set(&rx_pool->available, 0); 1149 rx_pool->next_alloc = 0; 1150 rx_pool->next_free = 0; 1151 /* replenish_rx_pool() may have called deactivate_rx_pools() 1152 * on failover. Ensure pool is active now. 1153 */ 1154 rx_pool->active = 1; 1155 } 1156 return 0; 1157 out_release: 1158 release_rx_pools(adapter); 1159 out: 1160 /* We failed to allocate one or more LTBs or map them on the VIOS. 1161 * Hold onto the pools and any LTBs that we did allocate/map. 1162 */ 1163 return rc; 1164 } 1165 1166 static void release_vpd_data(struct ibmvnic_adapter *adapter) 1167 { 1168 if (!adapter->vpd) 1169 return; 1170 1171 kfree(adapter->vpd->buff); 1172 kfree(adapter->vpd); 1173 1174 adapter->vpd = NULL; 1175 } 1176 1177 static void release_one_tx_pool(struct ibmvnic_adapter *adapter, 1178 struct ibmvnic_tx_pool *tx_pool) 1179 { 1180 kfree(tx_pool->tx_buff); 1181 kfree(tx_pool->free_map); 1182 free_ltb_set(adapter, &tx_pool->ltb_set); 1183 } 1184 1185 /** 1186 * release_tx_pools() - Release any tx pools attached to @adapter. 1187 * @adapter: ibmvnic adapter 1188 * 1189 * Safe to call this multiple times - even if no pools are attached. 1190 */ 1191 static void release_tx_pools(struct ibmvnic_adapter *adapter) 1192 { 1193 int i; 1194 1195 /* init_tx_pools() ensures that ->tx_pool and ->tso_pool are 1196 * both NULL or both non-NULL. So we only need to check one. 1197 */ 1198 if (!adapter->tx_pool) 1199 return; 1200 1201 for (i = 0; i < adapter->num_active_tx_pools; i++) { 1202 release_one_tx_pool(adapter, &adapter->tx_pool[i]); 1203 release_one_tx_pool(adapter, &adapter->tso_pool[i]); 1204 } 1205 1206 kfree(adapter->tx_pool); 1207 adapter->tx_pool = NULL; 1208 kfree(adapter->tso_pool); 1209 adapter->tso_pool = NULL; 1210 adapter->num_active_tx_pools = 0; 1211 adapter->prev_tx_pool_size = 0; 1212 } 1213 1214 static int init_one_tx_pool(struct net_device *netdev, 1215 struct ibmvnic_tx_pool *tx_pool, 1216 int pool_size, int buf_size) 1217 { 1218 int i; 1219 1220 tx_pool->tx_buff = kcalloc(pool_size, 1221 sizeof(struct ibmvnic_tx_buff), 1222 GFP_KERNEL); 1223 if (!tx_pool->tx_buff) 1224 return -ENOMEM; 1225 1226 tx_pool->free_map = kcalloc(pool_size, sizeof(int), GFP_KERNEL); 1227 if (!tx_pool->free_map) { 1228 kfree(tx_pool->tx_buff); 1229 tx_pool->tx_buff = NULL; 1230 return -ENOMEM; 1231 } 1232 1233 for (i = 0; i < pool_size; i++) 1234 tx_pool->free_map[i] = i; 1235 1236 tx_pool->consumer_index = 0; 1237 tx_pool->producer_index = 0; 1238 tx_pool->num_buffers = pool_size; 1239 tx_pool->buf_size = buf_size; 1240 1241 return 0; 1242 } 1243 1244 /** 1245 * reuse_tx_pools() - Check if the existing tx pools can be reused. 1246 * @adapter: ibmvnic adapter 1247 * 1248 * Check if the existing tx pools in the adapter can be reused. The 1249 * pools can be reused if the pool parameters (number of pools, 1250 * number of buffers in the pool and mtu) have not changed. 1251 * 1252 * NOTE: This assumes that all pools have the same number of buffers 1253 * which is the case currently. If that changes, we must fix this. 1254 * 1255 * Return: true if the tx pools can be reused, false otherwise. 1256 */ 1257 static bool reuse_tx_pools(struct ibmvnic_adapter *adapter) 1258 { 1259 u64 old_num_pools, new_num_pools; 1260 u64 old_pool_size, new_pool_size; 1261 u64 old_mtu, new_mtu; 1262 1263 if (!adapter->tx_pool) 1264 return false; 1265 1266 old_num_pools = adapter->num_active_tx_pools; 1267 new_num_pools = adapter->num_active_tx_scrqs; 1268 old_pool_size = adapter->prev_tx_pool_size; 1269 new_pool_size = adapter->req_tx_entries_per_subcrq; 1270 old_mtu = adapter->prev_mtu; 1271 new_mtu = adapter->req_mtu; 1272 1273 if (old_mtu != new_mtu || 1274 old_num_pools != new_num_pools || 1275 old_pool_size != new_pool_size) 1276 return false; 1277 1278 return true; 1279 } 1280 1281 /** 1282 * init_tx_pools(): Initialize the set of transmit pools in the adapter. 1283 * @netdev: net device associated with the vnic interface 1284 * 1285 * Initialize the set of transmit pools in the ibmvnic adapter associated 1286 * with the net_device @netdev. If possible, reuse the existing tx pools. 1287 * Otherwise free any existing pools and allocate a new set of pools 1288 * before initializing them. 1289 * 1290 * Return: 0 on success and negative value on error. 1291 */ 1292 static int init_tx_pools(struct net_device *netdev) 1293 { 1294 struct ibmvnic_adapter *adapter = netdev_priv(netdev); 1295 struct device *dev = &adapter->vdev->dev; 1296 int num_pools; 1297 u64 pool_size; /* # of buffers in pool */ 1298 u64 buff_size; 1299 int i, j, rc; 1300 1301 num_pools = adapter->req_tx_queues; 1302 1303 /* We must notify the VIOS about the LTB on all resets - but we only 1304 * need to alloc/populate pools if either the number of buffers or 1305 * size of each buffer in the pool has changed. 1306 */ 1307 if (reuse_tx_pools(adapter)) { 1308 netdev_dbg(netdev, "Reusing tx pools\n"); 1309 goto update_ltb; 1310 } 1311 1312 /* Allocate/populate the pools. */ 1313 release_tx_pools(adapter); 1314 1315 pool_size = adapter->req_tx_entries_per_subcrq; 1316 num_pools = adapter->num_active_tx_scrqs; 1317 1318 adapter->tx_pool = kcalloc(num_pools, 1319 sizeof(struct ibmvnic_tx_pool), GFP_KERNEL); 1320 if (!adapter->tx_pool) 1321 return -ENOMEM; 1322 1323 adapter->tso_pool = kcalloc(num_pools, 1324 sizeof(struct ibmvnic_tx_pool), GFP_KERNEL); 1325 /* To simplify release_tx_pools() ensure that ->tx_pool and 1326 * ->tso_pool are either both NULL or both non-NULL. 1327 */ 1328 if (!adapter->tso_pool) { 1329 kfree(adapter->tx_pool); 1330 adapter->tx_pool = NULL; 1331 return -ENOMEM; 1332 } 1333 1334 /* Set num_active_tx_pools early. If we fail below after partial 1335 * allocation, release_tx_pools() will know how many to look for. 1336 */ 1337 adapter->num_active_tx_pools = num_pools; 1338 1339 buff_size = adapter->req_mtu + VLAN_HLEN; 1340 buff_size = ALIGN(buff_size, L1_CACHE_BYTES); 1341 1342 for (i = 0; i < num_pools; i++) { 1343 dev_dbg(dev, "Init tx pool %d [%llu, %llu]\n", 1344 i, adapter->req_tx_entries_per_subcrq, buff_size); 1345 1346 rc = init_one_tx_pool(netdev, &adapter->tx_pool[i], 1347 pool_size, buff_size); 1348 if (rc) 1349 goto out_release; 1350 1351 rc = init_one_tx_pool(netdev, &adapter->tso_pool[i], 1352 IBMVNIC_TSO_BUFS, 1353 IBMVNIC_TSO_BUF_SZ); 1354 if (rc) 1355 goto out_release; 1356 } 1357 1358 adapter->prev_tx_pool_size = pool_size; 1359 adapter->prev_mtu = adapter->req_mtu; 1360 1361 update_ltb: 1362 /* NOTE: All tx_pools have the same number of buffers (which is 1363 * same as pool_size). All tso_pools have IBMVNIC_TSO_BUFS 1364 * buffers (see calls init_one_tx_pool() for these). 1365 * For consistency, we use tx_pool->num_buffers and 1366 * tso_pool->num_buffers below. 1367 */ 1368 rc = -1; 1369 for (i = 0; i < num_pools; i++) { 1370 struct ibmvnic_tx_pool *tso_pool; 1371 struct ibmvnic_tx_pool *tx_pool; 1372 1373 tx_pool = &adapter->tx_pool[i]; 1374 1375 dev_dbg(dev, "Updating LTB for tx pool %d [%d, %d]\n", 1376 i, tx_pool->num_buffers, tx_pool->buf_size); 1377 1378 rc = alloc_ltb_set(adapter, &tx_pool->ltb_set, 1379 tx_pool->num_buffers, tx_pool->buf_size); 1380 if (rc) 1381 goto out; 1382 1383 tx_pool->consumer_index = 0; 1384 tx_pool->producer_index = 0; 1385 1386 for (j = 0; j < tx_pool->num_buffers; j++) 1387 tx_pool->free_map[j] = j; 1388 1389 tso_pool = &adapter->tso_pool[i]; 1390 1391 dev_dbg(dev, "Updating LTB for tso pool %d [%d, %d]\n", 1392 i, tso_pool->num_buffers, tso_pool->buf_size); 1393 1394 rc = alloc_ltb_set(adapter, &tso_pool->ltb_set, 1395 tso_pool->num_buffers, tso_pool->buf_size); 1396 if (rc) 1397 goto out; 1398 1399 tso_pool->consumer_index = 0; 1400 tso_pool->producer_index = 0; 1401 1402 for (j = 0; j < tso_pool->num_buffers; j++) 1403 tso_pool->free_map[j] = j; 1404 } 1405 1406 return 0; 1407 out_release: 1408 release_tx_pools(adapter); 1409 out: 1410 /* We failed to allocate one or more LTBs or map them on the VIOS. 1411 * Hold onto the pools and any LTBs that we did allocate/map. 1412 */ 1413 return rc; 1414 } 1415 1416 static void ibmvnic_napi_enable(struct ibmvnic_adapter *adapter) 1417 { 1418 int i; 1419 1420 if (adapter->napi_enabled) 1421 return; 1422 1423 for (i = 0; i < adapter->req_rx_queues; i++) 1424 napi_enable(&adapter->napi[i]); 1425 1426 adapter->napi_enabled = true; 1427 } 1428 1429 static void ibmvnic_napi_disable(struct ibmvnic_adapter *adapter) 1430 { 1431 int i; 1432 1433 if (!adapter->napi_enabled) 1434 return; 1435 1436 for (i = 0; i < adapter->req_rx_queues; i++) { 1437 netdev_dbg(adapter->netdev, "Disabling napi[%d]\n", i); 1438 napi_disable(&adapter->napi[i]); 1439 } 1440 1441 adapter->napi_enabled = false; 1442 } 1443 1444 static int init_napi(struct ibmvnic_adapter *adapter) 1445 { 1446 int i; 1447 1448 adapter->napi = kcalloc(adapter->req_rx_queues, 1449 sizeof(struct napi_struct), GFP_KERNEL); 1450 if (!adapter->napi) 1451 return -ENOMEM; 1452 1453 for (i = 0; i < adapter->req_rx_queues; i++) { 1454 netdev_dbg(adapter->netdev, "Adding napi[%d]\n", i); 1455 netif_napi_add(adapter->netdev, &adapter->napi[i], 1456 ibmvnic_poll); 1457 } 1458 1459 adapter->num_active_rx_napi = adapter->req_rx_queues; 1460 return 0; 1461 } 1462 1463 static void release_napi(struct ibmvnic_adapter *adapter) 1464 { 1465 int i; 1466 1467 if (!adapter->napi) 1468 return; 1469 1470 for (i = 0; i < adapter->num_active_rx_napi; i++) { 1471 netdev_dbg(adapter->netdev, "Releasing napi[%d]\n", i); 1472 netif_napi_del(&adapter->napi[i]); 1473 } 1474 1475 kfree(adapter->napi); 1476 adapter->napi = NULL; 1477 adapter->num_active_rx_napi = 0; 1478 adapter->napi_enabled = false; 1479 } 1480 1481 static const char *adapter_state_to_string(enum vnic_state state) 1482 { 1483 switch (state) { 1484 case VNIC_PROBING: 1485 return "PROBING"; 1486 case VNIC_PROBED: 1487 return "PROBED"; 1488 case VNIC_OPENING: 1489 return "OPENING"; 1490 case VNIC_OPEN: 1491 return "OPEN"; 1492 case VNIC_CLOSING: 1493 return "CLOSING"; 1494 case VNIC_CLOSED: 1495 return "CLOSED"; 1496 case VNIC_REMOVING: 1497 return "REMOVING"; 1498 case VNIC_REMOVED: 1499 return "REMOVED"; 1500 case VNIC_DOWN: 1501 return "DOWN"; 1502 } 1503 return "UNKNOWN"; 1504 } 1505 1506 static int ibmvnic_login(struct net_device *netdev) 1507 { 1508 struct ibmvnic_adapter *adapter = netdev_priv(netdev); 1509 unsigned long timeout = msecs_to_jiffies(20000); 1510 int retry_count = 0; 1511 int retries = 10; 1512 bool retry; 1513 int rc; 1514 1515 do { 1516 retry = false; 1517 if (retry_count > retries) { 1518 netdev_warn(netdev, "Login attempts exceeded\n"); 1519 return -EACCES; 1520 } 1521 1522 adapter->init_done_rc = 0; 1523 reinit_completion(&adapter->init_done); 1524 rc = send_login(adapter); 1525 if (rc) 1526 return rc; 1527 1528 if (!wait_for_completion_timeout(&adapter->init_done, 1529 timeout)) { 1530 netdev_warn(netdev, "Login timed out, retrying...\n"); 1531 retry = true; 1532 adapter->init_done_rc = 0; 1533 retry_count++; 1534 continue; 1535 } 1536 1537 if (adapter->init_done_rc == ABORTED) { 1538 netdev_warn(netdev, "Login aborted, retrying...\n"); 1539 retry = true; 1540 adapter->init_done_rc = 0; 1541 retry_count++; 1542 /* FW or device may be busy, so 1543 * wait a bit before retrying login 1544 */ 1545 msleep(500); 1546 } else if (adapter->init_done_rc == PARTIALSUCCESS) { 1547 retry_count++; 1548 release_sub_crqs(adapter, 1); 1549 1550 retry = true; 1551 netdev_dbg(netdev, 1552 "Received partial success, retrying...\n"); 1553 adapter->init_done_rc = 0; 1554 reinit_completion(&adapter->init_done); 1555 send_query_cap(adapter); 1556 if (!wait_for_completion_timeout(&adapter->init_done, 1557 timeout)) { 1558 netdev_warn(netdev, 1559 "Capabilities query timed out\n"); 1560 return -ETIMEDOUT; 1561 } 1562 1563 rc = init_sub_crqs(adapter); 1564 if (rc) { 1565 netdev_warn(netdev, 1566 "SCRQ initialization failed\n"); 1567 return rc; 1568 } 1569 1570 rc = init_sub_crq_irqs(adapter); 1571 if (rc) { 1572 netdev_warn(netdev, 1573 "SCRQ irq initialization failed\n"); 1574 return rc; 1575 } 1576 } else if (adapter->init_done_rc) { 1577 netdev_warn(netdev, "Adapter login failed, init_done_rc = %d\n", 1578 adapter->init_done_rc); 1579 return -EIO; 1580 } 1581 } while (retry); 1582 1583 __ibmvnic_set_mac(netdev, adapter->mac_addr); 1584 1585 netdev_dbg(netdev, "[S:%s] Login succeeded\n", adapter_state_to_string(adapter->state)); 1586 return 0; 1587 } 1588 1589 static void release_login_buffer(struct ibmvnic_adapter *adapter) 1590 { 1591 kfree(adapter->login_buf); 1592 adapter->login_buf = NULL; 1593 } 1594 1595 static void release_login_rsp_buffer(struct ibmvnic_adapter *adapter) 1596 { 1597 kfree(adapter->login_rsp_buf); 1598 adapter->login_rsp_buf = NULL; 1599 } 1600 1601 static void release_resources(struct ibmvnic_adapter *adapter) 1602 { 1603 release_vpd_data(adapter); 1604 1605 release_napi(adapter); 1606 release_login_buffer(adapter); 1607 release_login_rsp_buffer(adapter); 1608 } 1609 1610 static int set_link_state(struct ibmvnic_adapter *adapter, u8 link_state) 1611 { 1612 struct net_device *netdev = adapter->netdev; 1613 unsigned long timeout = msecs_to_jiffies(20000); 1614 union ibmvnic_crq crq; 1615 bool resend; 1616 int rc; 1617 1618 netdev_dbg(netdev, "setting link state %d\n", link_state); 1619 1620 memset(&crq, 0, sizeof(crq)); 1621 crq.logical_link_state.first = IBMVNIC_CRQ_CMD; 1622 crq.logical_link_state.cmd = LOGICAL_LINK_STATE; 1623 crq.logical_link_state.link_state = link_state; 1624 1625 do { 1626 resend = false; 1627 1628 reinit_completion(&adapter->init_done); 1629 rc = ibmvnic_send_crq(adapter, &crq); 1630 if (rc) { 1631 netdev_err(netdev, "Failed to set link state\n"); 1632 return rc; 1633 } 1634 1635 if (!wait_for_completion_timeout(&adapter->init_done, 1636 timeout)) { 1637 netdev_err(netdev, "timeout setting link state\n"); 1638 return -ETIMEDOUT; 1639 } 1640 1641 if (adapter->init_done_rc == PARTIALSUCCESS) { 1642 /* Partuial success, delay and re-send */ 1643 mdelay(1000); 1644 resend = true; 1645 } else if (adapter->init_done_rc) { 1646 netdev_warn(netdev, "Unable to set link state, rc=%d\n", 1647 adapter->init_done_rc); 1648 return adapter->init_done_rc; 1649 } 1650 } while (resend); 1651 1652 return 0; 1653 } 1654 1655 static int set_real_num_queues(struct net_device *netdev) 1656 { 1657 struct ibmvnic_adapter *adapter = netdev_priv(netdev); 1658 int rc; 1659 1660 netdev_dbg(netdev, "Setting real tx/rx queues (%llx/%llx)\n", 1661 adapter->req_tx_queues, adapter->req_rx_queues); 1662 1663 rc = netif_set_real_num_tx_queues(netdev, adapter->req_tx_queues); 1664 if (rc) { 1665 netdev_err(netdev, "failed to set the number of tx queues\n"); 1666 return rc; 1667 } 1668 1669 rc = netif_set_real_num_rx_queues(netdev, adapter->req_rx_queues); 1670 if (rc) 1671 netdev_err(netdev, "failed to set the number of rx queues\n"); 1672 1673 return rc; 1674 } 1675 1676 static int ibmvnic_get_vpd(struct ibmvnic_adapter *adapter) 1677 { 1678 struct device *dev = &adapter->vdev->dev; 1679 union ibmvnic_crq crq; 1680 int len = 0; 1681 int rc; 1682 1683 if (adapter->vpd->buff) 1684 len = adapter->vpd->len; 1685 1686 mutex_lock(&adapter->fw_lock); 1687 adapter->fw_done_rc = 0; 1688 reinit_completion(&adapter->fw_done); 1689 1690 crq.get_vpd_size.first = IBMVNIC_CRQ_CMD; 1691 crq.get_vpd_size.cmd = GET_VPD_SIZE; 1692 rc = ibmvnic_send_crq(adapter, &crq); 1693 if (rc) { 1694 mutex_unlock(&adapter->fw_lock); 1695 return rc; 1696 } 1697 1698 rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000); 1699 if (rc) { 1700 dev_err(dev, "Could not retrieve VPD size, rc = %d\n", rc); 1701 mutex_unlock(&adapter->fw_lock); 1702 return rc; 1703 } 1704 mutex_unlock(&adapter->fw_lock); 1705 1706 if (!adapter->vpd->len) 1707 return -ENODATA; 1708 1709 if (!adapter->vpd->buff) 1710 adapter->vpd->buff = kzalloc(adapter->vpd->len, GFP_KERNEL); 1711 else if (adapter->vpd->len != len) 1712 adapter->vpd->buff = 1713 krealloc(adapter->vpd->buff, 1714 adapter->vpd->len, GFP_KERNEL); 1715 1716 if (!adapter->vpd->buff) { 1717 dev_err(dev, "Could allocate VPD buffer\n"); 1718 return -ENOMEM; 1719 } 1720 1721 adapter->vpd->dma_addr = 1722 dma_map_single(dev, adapter->vpd->buff, adapter->vpd->len, 1723 DMA_FROM_DEVICE); 1724 if (dma_mapping_error(dev, adapter->vpd->dma_addr)) { 1725 dev_err(dev, "Could not map VPD buffer\n"); 1726 kfree(adapter->vpd->buff); 1727 adapter->vpd->buff = NULL; 1728 return -ENOMEM; 1729 } 1730 1731 mutex_lock(&adapter->fw_lock); 1732 adapter->fw_done_rc = 0; 1733 reinit_completion(&adapter->fw_done); 1734 1735 crq.get_vpd.first = IBMVNIC_CRQ_CMD; 1736 crq.get_vpd.cmd = GET_VPD; 1737 crq.get_vpd.ioba = cpu_to_be32(adapter->vpd->dma_addr); 1738 crq.get_vpd.len = cpu_to_be32((u32)adapter->vpd->len); 1739 rc = ibmvnic_send_crq(adapter, &crq); 1740 if (rc) { 1741 kfree(adapter->vpd->buff); 1742 adapter->vpd->buff = NULL; 1743 mutex_unlock(&adapter->fw_lock); 1744 return rc; 1745 } 1746 1747 rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000); 1748 if (rc) { 1749 dev_err(dev, "Unable to retrieve VPD, rc = %d\n", rc); 1750 kfree(adapter->vpd->buff); 1751 adapter->vpd->buff = NULL; 1752 mutex_unlock(&adapter->fw_lock); 1753 return rc; 1754 } 1755 1756 mutex_unlock(&adapter->fw_lock); 1757 return 0; 1758 } 1759 1760 static int init_resources(struct ibmvnic_adapter *adapter) 1761 { 1762 struct net_device *netdev = adapter->netdev; 1763 int rc; 1764 1765 rc = set_real_num_queues(netdev); 1766 if (rc) 1767 return rc; 1768 1769 adapter->vpd = kzalloc(sizeof(*adapter->vpd), GFP_KERNEL); 1770 if (!adapter->vpd) 1771 return -ENOMEM; 1772 1773 /* Vital Product Data (VPD) */ 1774 rc = ibmvnic_get_vpd(adapter); 1775 if (rc) { 1776 netdev_err(netdev, "failed to initialize Vital Product Data (VPD)\n"); 1777 return rc; 1778 } 1779 1780 rc = init_napi(adapter); 1781 if (rc) 1782 return rc; 1783 1784 send_query_map(adapter); 1785 1786 rc = init_rx_pools(netdev); 1787 if (rc) 1788 return rc; 1789 1790 rc = init_tx_pools(netdev); 1791 return rc; 1792 } 1793 1794 static int __ibmvnic_open(struct net_device *netdev) 1795 { 1796 struct ibmvnic_adapter *adapter = netdev_priv(netdev); 1797 enum vnic_state prev_state = adapter->state; 1798 int i, rc; 1799 1800 adapter->state = VNIC_OPENING; 1801 replenish_pools(adapter); 1802 ibmvnic_napi_enable(adapter); 1803 1804 /* We're ready to receive frames, enable the sub-crq interrupts and 1805 * set the logical link state to up 1806 */ 1807 for (i = 0; i < adapter->req_rx_queues; i++) { 1808 netdev_dbg(netdev, "Enabling rx_scrq[%d] irq\n", i); 1809 if (prev_state == VNIC_CLOSED) 1810 enable_irq(adapter->rx_scrq[i]->irq); 1811 enable_scrq_irq(adapter, adapter->rx_scrq[i]); 1812 } 1813 1814 for (i = 0; i < adapter->req_tx_queues; i++) { 1815 netdev_dbg(netdev, "Enabling tx_scrq[%d] irq\n", i); 1816 if (prev_state == VNIC_CLOSED) 1817 enable_irq(adapter->tx_scrq[i]->irq); 1818 enable_scrq_irq(adapter, adapter->tx_scrq[i]); 1819 /* netdev_tx_reset_queue will reset dql stats. During NON_FATAL 1820 * resets, don't reset the stats because there could be batched 1821 * skb's waiting to be sent. If we reset dql stats, we risk 1822 * num_completed being greater than num_queued. This will cause 1823 * a BUG_ON in dql_completed(). 1824 */ 1825 if (adapter->reset_reason != VNIC_RESET_NON_FATAL) 1826 netdev_tx_reset_queue(netdev_get_tx_queue(netdev, i)); 1827 } 1828 1829 rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_UP); 1830 if (rc) { 1831 ibmvnic_napi_disable(adapter); 1832 ibmvnic_disable_irqs(adapter); 1833 return rc; 1834 } 1835 1836 adapter->tx_queues_active = true; 1837 1838 /* Since queues were stopped until now, there shouldn't be any 1839 * one in ibmvnic_complete_tx() or ibmvnic_xmit() so maybe we 1840 * don't need the synchronize_rcu()? Leaving it for consistency 1841 * with setting ->tx_queues_active = false. 1842 */ 1843 synchronize_rcu(); 1844 1845 netif_tx_start_all_queues(netdev); 1846 1847 if (prev_state == VNIC_CLOSED) { 1848 for (i = 0; i < adapter->req_rx_queues; i++) 1849 napi_schedule(&adapter->napi[i]); 1850 } 1851 1852 adapter->state = VNIC_OPEN; 1853 return rc; 1854 } 1855 1856 static int ibmvnic_open(struct net_device *netdev) 1857 { 1858 struct ibmvnic_adapter *adapter = netdev_priv(netdev); 1859 int rc; 1860 1861 ASSERT_RTNL(); 1862 1863 /* If device failover is pending or we are about to reset, just set 1864 * device state and return. Device operation will be handled by reset 1865 * routine. 1866 * 1867 * It should be safe to overwrite the adapter->state here. Since 1868 * we hold the rtnl, either the reset has not actually started or 1869 * the rtnl got dropped during the set_link_state() in do_reset(). 1870 * In the former case, no one else is changing the state (again we 1871 * have the rtnl) and in the latter case, do_reset() will detect and 1872 * honor our setting below. 1873 */ 1874 if (adapter->failover_pending || (test_bit(0, &adapter->resetting))) { 1875 netdev_dbg(netdev, "[S:%s FOP:%d] Resetting, deferring open\n", 1876 adapter_state_to_string(adapter->state), 1877 adapter->failover_pending); 1878 adapter->state = VNIC_OPEN; 1879 rc = 0; 1880 goto out; 1881 } 1882 1883 if (adapter->state != VNIC_CLOSED) { 1884 rc = ibmvnic_login(netdev); 1885 if (rc) 1886 goto out; 1887 1888 rc = init_resources(adapter); 1889 if (rc) { 1890 netdev_err(netdev, "failed to initialize resources\n"); 1891 goto out; 1892 } 1893 } 1894 1895 rc = __ibmvnic_open(netdev); 1896 1897 out: 1898 /* If open failed and there is a pending failover or in-progress reset, 1899 * set device state and return. Device operation will be handled by 1900 * reset routine. See also comments above regarding rtnl. 1901 */ 1902 if (rc && 1903 (adapter->failover_pending || (test_bit(0, &adapter->resetting)))) { 1904 adapter->state = VNIC_OPEN; 1905 rc = 0; 1906 } 1907 1908 if (rc) { 1909 release_resources(adapter); 1910 release_rx_pools(adapter); 1911 release_tx_pools(adapter); 1912 } 1913 1914 return rc; 1915 } 1916 1917 static void clean_rx_pools(struct ibmvnic_adapter *adapter) 1918 { 1919 struct ibmvnic_rx_pool *rx_pool; 1920 struct ibmvnic_rx_buff *rx_buff; 1921 u64 rx_entries; 1922 int rx_scrqs; 1923 int i, j; 1924 1925 if (!adapter->rx_pool) 1926 return; 1927 1928 rx_scrqs = adapter->num_active_rx_pools; 1929 rx_entries = adapter->req_rx_add_entries_per_subcrq; 1930 1931 /* Free any remaining skbs in the rx buffer pools */ 1932 for (i = 0; i < rx_scrqs; i++) { 1933 rx_pool = &adapter->rx_pool[i]; 1934 if (!rx_pool || !rx_pool->rx_buff) 1935 continue; 1936 1937 netdev_dbg(adapter->netdev, "Cleaning rx_pool[%d]\n", i); 1938 for (j = 0; j < rx_entries; j++) { 1939 rx_buff = &rx_pool->rx_buff[j]; 1940 if (rx_buff && rx_buff->skb) { 1941 dev_kfree_skb_any(rx_buff->skb); 1942 rx_buff->skb = NULL; 1943 } 1944 } 1945 } 1946 } 1947 1948 static void clean_one_tx_pool(struct ibmvnic_adapter *adapter, 1949 struct ibmvnic_tx_pool *tx_pool) 1950 { 1951 struct ibmvnic_tx_buff *tx_buff; 1952 u64 tx_entries; 1953 int i; 1954 1955 if (!tx_pool || !tx_pool->tx_buff) 1956 return; 1957 1958 tx_entries = tx_pool->num_buffers; 1959 1960 for (i = 0; i < tx_entries; i++) { 1961 tx_buff = &tx_pool->tx_buff[i]; 1962 if (tx_buff && tx_buff->skb) { 1963 dev_kfree_skb_any(tx_buff->skb); 1964 tx_buff->skb = NULL; 1965 } 1966 } 1967 } 1968 1969 static void clean_tx_pools(struct ibmvnic_adapter *adapter) 1970 { 1971 int tx_scrqs; 1972 int i; 1973 1974 if (!adapter->tx_pool || !adapter->tso_pool) 1975 return; 1976 1977 tx_scrqs = adapter->num_active_tx_pools; 1978 1979 /* Free any remaining skbs in the tx buffer pools */ 1980 for (i = 0; i < tx_scrqs; i++) { 1981 netdev_dbg(adapter->netdev, "Cleaning tx_pool[%d]\n", i); 1982 clean_one_tx_pool(adapter, &adapter->tx_pool[i]); 1983 clean_one_tx_pool(adapter, &adapter->tso_pool[i]); 1984 } 1985 } 1986 1987 static void ibmvnic_disable_irqs(struct ibmvnic_adapter *adapter) 1988 { 1989 struct net_device *netdev = adapter->netdev; 1990 int i; 1991 1992 if (adapter->tx_scrq) { 1993 for (i = 0; i < adapter->req_tx_queues; i++) 1994 if (adapter->tx_scrq[i]->irq) { 1995 netdev_dbg(netdev, 1996 "Disabling tx_scrq[%d] irq\n", i); 1997 disable_scrq_irq(adapter, adapter->tx_scrq[i]); 1998 disable_irq(adapter->tx_scrq[i]->irq); 1999 } 2000 } 2001 2002 if (adapter->rx_scrq) { 2003 for (i = 0; i < adapter->req_rx_queues; i++) { 2004 if (adapter->rx_scrq[i]->irq) { 2005 netdev_dbg(netdev, 2006 "Disabling rx_scrq[%d] irq\n", i); 2007 disable_scrq_irq(adapter, adapter->rx_scrq[i]); 2008 disable_irq(adapter->rx_scrq[i]->irq); 2009 } 2010 } 2011 } 2012 } 2013 2014 static void ibmvnic_cleanup(struct net_device *netdev) 2015 { 2016 struct ibmvnic_adapter *adapter = netdev_priv(netdev); 2017 2018 /* ensure that transmissions are stopped if called by do_reset */ 2019 2020 adapter->tx_queues_active = false; 2021 2022 /* Ensure complete_tx() and ibmvnic_xmit() see ->tx_queues_active 2023 * update so they don't restart a queue after we stop it below. 2024 */ 2025 synchronize_rcu(); 2026 2027 if (test_bit(0, &adapter->resetting)) 2028 netif_tx_disable(netdev); 2029 else 2030 netif_tx_stop_all_queues(netdev); 2031 2032 ibmvnic_napi_disable(adapter); 2033 ibmvnic_disable_irqs(adapter); 2034 } 2035 2036 static int __ibmvnic_close(struct net_device *netdev) 2037 { 2038 struct ibmvnic_adapter *adapter = netdev_priv(netdev); 2039 int rc = 0; 2040 2041 adapter->state = VNIC_CLOSING; 2042 rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_DN); 2043 adapter->state = VNIC_CLOSED; 2044 return rc; 2045 } 2046 2047 static int ibmvnic_close(struct net_device *netdev) 2048 { 2049 struct ibmvnic_adapter *adapter = netdev_priv(netdev); 2050 int rc; 2051 2052 netdev_dbg(netdev, "[S:%s FOP:%d FRR:%d] Closing\n", 2053 adapter_state_to_string(adapter->state), 2054 adapter->failover_pending, 2055 adapter->force_reset_recovery); 2056 2057 /* If device failover is pending, just set device state and return. 2058 * Device operation will be handled by reset routine. 2059 */ 2060 if (adapter->failover_pending) { 2061 adapter->state = VNIC_CLOSED; 2062 return 0; 2063 } 2064 2065 rc = __ibmvnic_close(netdev); 2066 ibmvnic_cleanup(netdev); 2067 clean_rx_pools(adapter); 2068 clean_tx_pools(adapter); 2069 2070 return rc; 2071 } 2072 2073 /** 2074 * build_hdr_data - creates L2/L3/L4 header data buffer 2075 * @hdr_field: bitfield determining needed headers 2076 * @skb: socket buffer 2077 * @hdr_len: array of header lengths 2078 * @hdr_data: buffer to write the header to 2079 * 2080 * Reads hdr_field to determine which headers are needed by firmware. 2081 * Builds a buffer containing these headers. Saves individual header 2082 * lengths and total buffer length to be used to build descriptors. 2083 */ 2084 static int build_hdr_data(u8 hdr_field, struct sk_buff *skb, 2085 int *hdr_len, u8 *hdr_data) 2086 { 2087 int len = 0; 2088 u8 *hdr; 2089 2090 if (skb_vlan_tagged(skb) && !skb_vlan_tag_present(skb)) 2091 hdr_len[0] = sizeof(struct vlan_ethhdr); 2092 else 2093 hdr_len[0] = sizeof(struct ethhdr); 2094 2095 if (skb->protocol == htons(ETH_P_IP)) { 2096 hdr_len[1] = ip_hdr(skb)->ihl * 4; 2097 if (ip_hdr(skb)->protocol == IPPROTO_TCP) 2098 hdr_len[2] = tcp_hdrlen(skb); 2099 else if (ip_hdr(skb)->protocol == IPPROTO_UDP) 2100 hdr_len[2] = sizeof(struct udphdr); 2101 } else if (skb->protocol == htons(ETH_P_IPV6)) { 2102 hdr_len[1] = sizeof(struct ipv6hdr); 2103 if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP) 2104 hdr_len[2] = tcp_hdrlen(skb); 2105 else if (ipv6_hdr(skb)->nexthdr == IPPROTO_UDP) 2106 hdr_len[2] = sizeof(struct udphdr); 2107 } else if (skb->protocol == htons(ETH_P_ARP)) { 2108 hdr_len[1] = arp_hdr_len(skb->dev); 2109 hdr_len[2] = 0; 2110 } 2111 2112 memset(hdr_data, 0, 120); 2113 if ((hdr_field >> 6) & 1) { 2114 hdr = skb_mac_header(skb); 2115 memcpy(hdr_data, hdr, hdr_len[0]); 2116 len += hdr_len[0]; 2117 } 2118 2119 if ((hdr_field >> 5) & 1) { 2120 hdr = skb_network_header(skb); 2121 memcpy(hdr_data + len, hdr, hdr_len[1]); 2122 len += hdr_len[1]; 2123 } 2124 2125 if ((hdr_field >> 4) & 1) { 2126 hdr = skb_transport_header(skb); 2127 memcpy(hdr_data + len, hdr, hdr_len[2]); 2128 len += hdr_len[2]; 2129 } 2130 return len; 2131 } 2132 2133 /** 2134 * create_hdr_descs - create header and header extension descriptors 2135 * @hdr_field: bitfield determining needed headers 2136 * @hdr_data: buffer containing header data 2137 * @len: length of data buffer 2138 * @hdr_len: array of individual header lengths 2139 * @scrq_arr: descriptor array 2140 * 2141 * Creates header and, if needed, header extension descriptors and 2142 * places them in a descriptor array, scrq_arr 2143 */ 2144 2145 static int create_hdr_descs(u8 hdr_field, u8 *hdr_data, int len, int *hdr_len, 2146 union sub_crq *scrq_arr) 2147 { 2148 union sub_crq hdr_desc; 2149 int tmp_len = len; 2150 int num_descs = 0; 2151 u8 *data, *cur; 2152 int tmp; 2153 2154 while (tmp_len > 0) { 2155 cur = hdr_data + len - tmp_len; 2156 2157 memset(&hdr_desc, 0, sizeof(hdr_desc)); 2158 if (cur != hdr_data) { 2159 data = hdr_desc.hdr_ext.data; 2160 tmp = tmp_len > 29 ? 29 : tmp_len; 2161 hdr_desc.hdr_ext.first = IBMVNIC_CRQ_CMD; 2162 hdr_desc.hdr_ext.type = IBMVNIC_HDR_EXT_DESC; 2163 hdr_desc.hdr_ext.len = tmp; 2164 } else { 2165 data = hdr_desc.hdr.data; 2166 tmp = tmp_len > 24 ? 24 : tmp_len; 2167 hdr_desc.hdr.first = IBMVNIC_CRQ_CMD; 2168 hdr_desc.hdr.type = IBMVNIC_HDR_DESC; 2169 hdr_desc.hdr.len = tmp; 2170 hdr_desc.hdr.l2_len = (u8)hdr_len[0]; 2171 hdr_desc.hdr.l3_len = cpu_to_be16((u16)hdr_len[1]); 2172 hdr_desc.hdr.l4_len = (u8)hdr_len[2]; 2173 hdr_desc.hdr.flag = hdr_field << 1; 2174 } 2175 memcpy(data, cur, tmp); 2176 tmp_len -= tmp; 2177 *scrq_arr = hdr_desc; 2178 scrq_arr++; 2179 num_descs++; 2180 } 2181 2182 return num_descs; 2183 } 2184 2185 /** 2186 * build_hdr_descs_arr - build a header descriptor array 2187 * @skb: tx socket buffer 2188 * @indir_arr: indirect array 2189 * @num_entries: number of descriptors to be sent 2190 * @hdr_field: bit field determining which headers will be sent 2191 * 2192 * This function will build a TX descriptor array with applicable 2193 * L2/L3/L4 packet header descriptors to be sent by send_subcrq_indirect. 2194 */ 2195 2196 static void build_hdr_descs_arr(struct sk_buff *skb, 2197 union sub_crq *indir_arr, 2198 int *num_entries, u8 hdr_field) 2199 { 2200 int hdr_len[3] = {0, 0, 0}; 2201 u8 hdr_data[140] = {0}; 2202 int tot_len; 2203 2204 tot_len = build_hdr_data(hdr_field, skb, hdr_len, 2205 hdr_data); 2206 *num_entries += create_hdr_descs(hdr_field, hdr_data, tot_len, hdr_len, 2207 indir_arr + 1); 2208 } 2209 2210 static int ibmvnic_xmit_workarounds(struct sk_buff *skb, 2211 struct net_device *netdev) 2212 { 2213 /* For some backing devices, mishandling of small packets 2214 * can result in a loss of connection or TX stall. Device 2215 * architects recommend that no packet should be smaller 2216 * than the minimum MTU value provided to the driver, so 2217 * pad any packets to that length 2218 */ 2219 if (skb->len < netdev->min_mtu) 2220 return skb_put_padto(skb, netdev->min_mtu); 2221 2222 return 0; 2223 } 2224 2225 static void ibmvnic_tx_scrq_clean_buffer(struct ibmvnic_adapter *adapter, 2226 struct ibmvnic_sub_crq_queue *tx_scrq) 2227 { 2228 struct ibmvnic_ind_xmit_queue *ind_bufp; 2229 struct ibmvnic_tx_buff *tx_buff; 2230 struct ibmvnic_tx_pool *tx_pool; 2231 union sub_crq tx_scrq_entry; 2232 int queue_num; 2233 int entries; 2234 int index; 2235 int i; 2236 2237 ind_bufp = &tx_scrq->ind_buf; 2238 entries = (u64)ind_bufp->index; 2239 queue_num = tx_scrq->pool_index; 2240 2241 for (i = entries - 1; i >= 0; --i) { 2242 tx_scrq_entry = ind_bufp->indir_arr[i]; 2243 if (tx_scrq_entry.v1.type != IBMVNIC_TX_DESC) 2244 continue; 2245 index = be32_to_cpu(tx_scrq_entry.v1.correlator); 2246 if (index & IBMVNIC_TSO_POOL_MASK) { 2247 tx_pool = &adapter->tso_pool[queue_num]; 2248 index &= ~IBMVNIC_TSO_POOL_MASK; 2249 } else { 2250 tx_pool = &adapter->tx_pool[queue_num]; 2251 } 2252 tx_pool->free_map[tx_pool->consumer_index] = index; 2253 tx_pool->consumer_index = tx_pool->consumer_index == 0 ? 2254 tx_pool->num_buffers - 1 : 2255 tx_pool->consumer_index - 1; 2256 tx_buff = &tx_pool->tx_buff[index]; 2257 adapter->netdev->stats.tx_packets--; 2258 adapter->netdev->stats.tx_bytes -= tx_buff->skb->len; 2259 adapter->tx_stats_buffers[queue_num].packets--; 2260 adapter->tx_stats_buffers[queue_num].bytes -= 2261 tx_buff->skb->len; 2262 dev_kfree_skb_any(tx_buff->skb); 2263 tx_buff->skb = NULL; 2264 adapter->netdev->stats.tx_dropped++; 2265 } 2266 2267 ind_bufp->index = 0; 2268 2269 if (atomic_sub_return(entries, &tx_scrq->used) <= 2270 (adapter->req_tx_entries_per_subcrq / 2) && 2271 __netif_subqueue_stopped(adapter->netdev, queue_num)) { 2272 rcu_read_lock(); 2273 2274 if (adapter->tx_queues_active) { 2275 netif_wake_subqueue(adapter->netdev, queue_num); 2276 netdev_dbg(adapter->netdev, "Started queue %d\n", 2277 queue_num); 2278 } 2279 2280 rcu_read_unlock(); 2281 } 2282 } 2283 2284 static int ibmvnic_tx_scrq_flush(struct ibmvnic_adapter *adapter, 2285 struct ibmvnic_sub_crq_queue *tx_scrq) 2286 { 2287 struct ibmvnic_ind_xmit_queue *ind_bufp; 2288 u64 dma_addr; 2289 u64 entries; 2290 u64 handle; 2291 int rc; 2292 2293 ind_bufp = &tx_scrq->ind_buf; 2294 dma_addr = (u64)ind_bufp->indir_dma; 2295 entries = (u64)ind_bufp->index; 2296 handle = tx_scrq->handle; 2297 2298 if (!entries) 2299 return 0; 2300 rc = send_subcrq_indirect(adapter, handle, dma_addr, entries); 2301 if (rc) 2302 ibmvnic_tx_scrq_clean_buffer(adapter, tx_scrq); 2303 else 2304 ind_bufp->index = 0; 2305 return 0; 2306 } 2307 2308 static netdev_tx_t ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev) 2309 { 2310 struct ibmvnic_adapter *adapter = netdev_priv(netdev); 2311 int queue_num = skb_get_queue_mapping(skb); 2312 u8 *hdrs = (u8 *)&adapter->tx_rx_desc_req; 2313 struct device *dev = &adapter->vdev->dev; 2314 struct ibmvnic_ind_xmit_queue *ind_bufp; 2315 struct ibmvnic_tx_buff *tx_buff = NULL; 2316 struct ibmvnic_sub_crq_queue *tx_scrq; 2317 struct ibmvnic_long_term_buff *ltb; 2318 struct ibmvnic_tx_pool *tx_pool; 2319 unsigned int tx_send_failed = 0; 2320 netdev_tx_t ret = NETDEV_TX_OK; 2321 unsigned int tx_map_failed = 0; 2322 union sub_crq indir_arr[16]; 2323 unsigned int tx_dropped = 0; 2324 unsigned int tx_packets = 0; 2325 unsigned int tx_bytes = 0; 2326 dma_addr_t data_dma_addr; 2327 struct netdev_queue *txq; 2328 unsigned long lpar_rc; 2329 union sub_crq tx_crq; 2330 unsigned int offset; 2331 int num_entries = 1; 2332 unsigned char *dst; 2333 int bufidx = 0; 2334 u8 proto = 0; 2335 2336 /* If a reset is in progress, drop the packet since 2337 * the scrqs may get torn down. Otherwise use the 2338 * rcu to ensure reset waits for us to complete. 2339 */ 2340 rcu_read_lock(); 2341 if (!adapter->tx_queues_active) { 2342 dev_kfree_skb_any(skb); 2343 2344 tx_send_failed++; 2345 tx_dropped++; 2346 ret = NETDEV_TX_OK; 2347 goto out; 2348 } 2349 2350 tx_scrq = adapter->tx_scrq[queue_num]; 2351 txq = netdev_get_tx_queue(netdev, queue_num); 2352 ind_bufp = &tx_scrq->ind_buf; 2353 2354 if (ibmvnic_xmit_workarounds(skb, netdev)) { 2355 tx_dropped++; 2356 tx_send_failed++; 2357 ret = NETDEV_TX_OK; 2358 ibmvnic_tx_scrq_flush(adapter, tx_scrq); 2359 goto out; 2360 } 2361 2362 if (skb_is_gso(skb)) 2363 tx_pool = &adapter->tso_pool[queue_num]; 2364 else 2365 tx_pool = &adapter->tx_pool[queue_num]; 2366 2367 bufidx = tx_pool->free_map[tx_pool->consumer_index]; 2368 2369 if (bufidx == IBMVNIC_INVALID_MAP) { 2370 dev_kfree_skb_any(skb); 2371 tx_send_failed++; 2372 tx_dropped++; 2373 ibmvnic_tx_scrq_flush(adapter, tx_scrq); 2374 ret = NETDEV_TX_OK; 2375 goto out; 2376 } 2377 2378 tx_pool->free_map[tx_pool->consumer_index] = IBMVNIC_INVALID_MAP; 2379 2380 map_txpool_buf_to_ltb(tx_pool, bufidx, <b, &offset); 2381 2382 dst = ltb->buff + offset; 2383 memset(dst, 0, tx_pool->buf_size); 2384 data_dma_addr = ltb->addr + offset; 2385 2386 if (skb_shinfo(skb)->nr_frags) { 2387 int cur, i; 2388 2389 /* Copy the head */ 2390 skb_copy_from_linear_data(skb, dst, skb_headlen(skb)); 2391 cur = skb_headlen(skb); 2392 2393 /* Copy the frags */ 2394 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 2395 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 2396 2397 memcpy(dst + cur, skb_frag_address(frag), 2398 skb_frag_size(frag)); 2399 cur += skb_frag_size(frag); 2400 } 2401 } else { 2402 skb_copy_from_linear_data(skb, dst, skb->len); 2403 } 2404 2405 /* post changes to long_term_buff *dst before VIOS accessing it */ 2406 dma_wmb(); 2407 2408 tx_pool->consumer_index = 2409 (tx_pool->consumer_index + 1) % tx_pool->num_buffers; 2410 2411 tx_buff = &tx_pool->tx_buff[bufidx]; 2412 tx_buff->skb = skb; 2413 tx_buff->index = bufidx; 2414 tx_buff->pool_index = queue_num; 2415 2416 memset(&tx_crq, 0, sizeof(tx_crq)); 2417 tx_crq.v1.first = IBMVNIC_CRQ_CMD; 2418 tx_crq.v1.type = IBMVNIC_TX_DESC; 2419 tx_crq.v1.n_crq_elem = 1; 2420 tx_crq.v1.n_sge = 1; 2421 tx_crq.v1.flags1 = IBMVNIC_TX_COMP_NEEDED; 2422 2423 if (skb_is_gso(skb)) 2424 tx_crq.v1.correlator = 2425 cpu_to_be32(bufidx | IBMVNIC_TSO_POOL_MASK); 2426 else 2427 tx_crq.v1.correlator = cpu_to_be32(bufidx); 2428 tx_crq.v1.dma_reg = cpu_to_be16(ltb->map_id); 2429 tx_crq.v1.sge_len = cpu_to_be32(skb->len); 2430 tx_crq.v1.ioba = cpu_to_be64(data_dma_addr); 2431 2432 if (adapter->vlan_header_insertion && skb_vlan_tag_present(skb)) { 2433 tx_crq.v1.flags2 |= IBMVNIC_TX_VLAN_INSERT; 2434 tx_crq.v1.vlan_id = cpu_to_be16(skb->vlan_tci); 2435 } 2436 2437 if (skb->protocol == htons(ETH_P_IP)) { 2438 tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_IPV4; 2439 proto = ip_hdr(skb)->protocol; 2440 } else if (skb->protocol == htons(ETH_P_IPV6)) { 2441 tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_IPV6; 2442 proto = ipv6_hdr(skb)->nexthdr; 2443 } 2444 2445 if (proto == IPPROTO_TCP) 2446 tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_TCP; 2447 else if (proto == IPPROTO_UDP) 2448 tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_UDP; 2449 2450 if (skb->ip_summed == CHECKSUM_PARTIAL) { 2451 tx_crq.v1.flags1 |= IBMVNIC_TX_CHKSUM_OFFLOAD; 2452 hdrs += 2; 2453 } 2454 if (skb_is_gso(skb)) { 2455 tx_crq.v1.flags1 |= IBMVNIC_TX_LSO; 2456 tx_crq.v1.mss = cpu_to_be16(skb_shinfo(skb)->gso_size); 2457 hdrs += 2; 2458 } 2459 2460 if ((*hdrs >> 7) & 1) 2461 build_hdr_descs_arr(skb, indir_arr, &num_entries, *hdrs); 2462 2463 tx_crq.v1.n_crq_elem = num_entries; 2464 tx_buff->num_entries = num_entries; 2465 /* flush buffer if current entry can not fit */ 2466 if (num_entries + ind_bufp->index > IBMVNIC_MAX_IND_DESCS) { 2467 lpar_rc = ibmvnic_tx_scrq_flush(adapter, tx_scrq); 2468 if (lpar_rc != H_SUCCESS) 2469 goto tx_flush_err; 2470 } 2471 2472 indir_arr[0] = tx_crq; 2473 memcpy(&ind_bufp->indir_arr[ind_bufp->index], &indir_arr[0], 2474 num_entries * sizeof(struct ibmvnic_generic_scrq)); 2475 ind_bufp->index += num_entries; 2476 if (__netdev_tx_sent_queue(txq, skb->len, 2477 netdev_xmit_more() && 2478 ind_bufp->index < IBMVNIC_MAX_IND_DESCS)) { 2479 lpar_rc = ibmvnic_tx_scrq_flush(adapter, tx_scrq); 2480 if (lpar_rc != H_SUCCESS) 2481 goto tx_err; 2482 } 2483 2484 if (atomic_add_return(num_entries, &tx_scrq->used) 2485 >= adapter->req_tx_entries_per_subcrq) { 2486 netdev_dbg(netdev, "Stopping queue %d\n", queue_num); 2487 netif_stop_subqueue(netdev, queue_num); 2488 } 2489 2490 tx_packets++; 2491 tx_bytes += skb->len; 2492 txq_trans_cond_update(txq); 2493 ret = NETDEV_TX_OK; 2494 goto out; 2495 2496 tx_flush_err: 2497 dev_kfree_skb_any(skb); 2498 tx_buff->skb = NULL; 2499 tx_pool->consumer_index = tx_pool->consumer_index == 0 ? 2500 tx_pool->num_buffers - 1 : 2501 tx_pool->consumer_index - 1; 2502 tx_dropped++; 2503 tx_err: 2504 if (lpar_rc != H_CLOSED && lpar_rc != H_PARAMETER) 2505 dev_err_ratelimited(dev, "tx: send failed\n"); 2506 2507 if (lpar_rc == H_CLOSED || adapter->failover_pending) { 2508 /* Disable TX and report carrier off if queue is closed 2509 * or pending failover. 2510 * Firmware guarantees that a signal will be sent to the 2511 * driver, triggering a reset or some other action. 2512 */ 2513 netif_tx_stop_all_queues(netdev); 2514 netif_carrier_off(netdev); 2515 } 2516 out: 2517 rcu_read_unlock(); 2518 netdev->stats.tx_dropped += tx_dropped; 2519 netdev->stats.tx_bytes += tx_bytes; 2520 netdev->stats.tx_packets += tx_packets; 2521 adapter->tx_send_failed += tx_send_failed; 2522 adapter->tx_map_failed += tx_map_failed; 2523 adapter->tx_stats_buffers[queue_num].packets += tx_packets; 2524 adapter->tx_stats_buffers[queue_num].bytes += tx_bytes; 2525 adapter->tx_stats_buffers[queue_num].dropped_packets += tx_dropped; 2526 2527 return ret; 2528 } 2529 2530 static void ibmvnic_set_multi(struct net_device *netdev) 2531 { 2532 struct ibmvnic_adapter *adapter = netdev_priv(netdev); 2533 struct netdev_hw_addr *ha; 2534 union ibmvnic_crq crq; 2535 2536 memset(&crq, 0, sizeof(crq)); 2537 crq.request_capability.first = IBMVNIC_CRQ_CMD; 2538 crq.request_capability.cmd = REQUEST_CAPABILITY; 2539 2540 if (netdev->flags & IFF_PROMISC) { 2541 if (!adapter->promisc_supported) 2542 return; 2543 } else { 2544 if (netdev->flags & IFF_ALLMULTI) { 2545 /* Accept all multicast */ 2546 memset(&crq, 0, sizeof(crq)); 2547 crq.multicast_ctrl.first = IBMVNIC_CRQ_CMD; 2548 crq.multicast_ctrl.cmd = MULTICAST_CTRL; 2549 crq.multicast_ctrl.flags = IBMVNIC_ENABLE_ALL; 2550 ibmvnic_send_crq(adapter, &crq); 2551 } else if (netdev_mc_empty(netdev)) { 2552 /* Reject all multicast */ 2553 memset(&crq, 0, sizeof(crq)); 2554 crq.multicast_ctrl.first = IBMVNIC_CRQ_CMD; 2555 crq.multicast_ctrl.cmd = MULTICAST_CTRL; 2556 crq.multicast_ctrl.flags = IBMVNIC_DISABLE_ALL; 2557 ibmvnic_send_crq(adapter, &crq); 2558 } else { 2559 /* Accept one or more multicast(s) */ 2560 netdev_for_each_mc_addr(ha, netdev) { 2561 memset(&crq, 0, sizeof(crq)); 2562 crq.multicast_ctrl.first = IBMVNIC_CRQ_CMD; 2563 crq.multicast_ctrl.cmd = MULTICAST_CTRL; 2564 crq.multicast_ctrl.flags = IBMVNIC_ENABLE_MC; 2565 ether_addr_copy(&crq.multicast_ctrl.mac_addr[0], 2566 ha->addr); 2567 ibmvnic_send_crq(adapter, &crq); 2568 } 2569 } 2570 } 2571 } 2572 2573 static int __ibmvnic_set_mac(struct net_device *netdev, u8 *dev_addr) 2574 { 2575 struct ibmvnic_adapter *adapter = netdev_priv(netdev); 2576 union ibmvnic_crq crq; 2577 int rc; 2578 2579 if (!is_valid_ether_addr(dev_addr)) { 2580 rc = -EADDRNOTAVAIL; 2581 goto err; 2582 } 2583 2584 memset(&crq, 0, sizeof(crq)); 2585 crq.change_mac_addr.first = IBMVNIC_CRQ_CMD; 2586 crq.change_mac_addr.cmd = CHANGE_MAC_ADDR; 2587 ether_addr_copy(&crq.change_mac_addr.mac_addr[0], dev_addr); 2588 2589 mutex_lock(&adapter->fw_lock); 2590 adapter->fw_done_rc = 0; 2591 reinit_completion(&adapter->fw_done); 2592 2593 rc = ibmvnic_send_crq(adapter, &crq); 2594 if (rc) { 2595 rc = -EIO; 2596 mutex_unlock(&adapter->fw_lock); 2597 goto err; 2598 } 2599 2600 rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000); 2601 /* netdev->dev_addr is changed in handle_change_mac_rsp function */ 2602 if (rc || adapter->fw_done_rc) { 2603 rc = -EIO; 2604 mutex_unlock(&adapter->fw_lock); 2605 goto err; 2606 } 2607 mutex_unlock(&adapter->fw_lock); 2608 return 0; 2609 err: 2610 ether_addr_copy(adapter->mac_addr, netdev->dev_addr); 2611 return rc; 2612 } 2613 2614 static int ibmvnic_set_mac(struct net_device *netdev, void *p) 2615 { 2616 struct ibmvnic_adapter *adapter = netdev_priv(netdev); 2617 struct sockaddr *addr = p; 2618 int rc; 2619 2620 rc = 0; 2621 if (!is_valid_ether_addr(addr->sa_data)) 2622 return -EADDRNOTAVAIL; 2623 2624 ether_addr_copy(adapter->mac_addr, addr->sa_data); 2625 if (adapter->state != VNIC_PROBED) 2626 rc = __ibmvnic_set_mac(netdev, addr->sa_data); 2627 2628 return rc; 2629 } 2630 2631 static const char *reset_reason_to_string(enum ibmvnic_reset_reason reason) 2632 { 2633 switch (reason) { 2634 case VNIC_RESET_FAILOVER: 2635 return "FAILOVER"; 2636 case VNIC_RESET_MOBILITY: 2637 return "MOBILITY"; 2638 case VNIC_RESET_FATAL: 2639 return "FATAL"; 2640 case VNIC_RESET_NON_FATAL: 2641 return "NON_FATAL"; 2642 case VNIC_RESET_TIMEOUT: 2643 return "TIMEOUT"; 2644 case VNIC_RESET_CHANGE_PARAM: 2645 return "CHANGE_PARAM"; 2646 case VNIC_RESET_PASSIVE_INIT: 2647 return "PASSIVE_INIT"; 2648 } 2649 return "UNKNOWN"; 2650 } 2651 2652 /* 2653 * Initialize the init_done completion and return code values. We 2654 * can get a transport event just after registering the CRQ and the 2655 * tasklet will use this to communicate the transport event. To ensure 2656 * we don't miss the notification/error, initialize these _before_ 2657 * regisering the CRQ. 2658 */ 2659 static inline void reinit_init_done(struct ibmvnic_adapter *adapter) 2660 { 2661 reinit_completion(&adapter->init_done); 2662 adapter->init_done_rc = 0; 2663 } 2664 2665 /* 2666 * do_reset returns zero if we are able to keep processing reset events, or 2667 * non-zero if we hit a fatal error and must halt. 2668 */ 2669 static int do_reset(struct ibmvnic_adapter *adapter, 2670 struct ibmvnic_rwi *rwi, u32 reset_state) 2671 { 2672 struct net_device *netdev = adapter->netdev; 2673 u64 old_num_rx_queues, old_num_tx_queues; 2674 u64 old_num_rx_slots, old_num_tx_slots; 2675 int rc; 2676 2677 netdev_dbg(adapter->netdev, 2678 "[S:%s FOP:%d] Reset reason: %s, reset_state: %s\n", 2679 adapter_state_to_string(adapter->state), 2680 adapter->failover_pending, 2681 reset_reason_to_string(rwi->reset_reason), 2682 adapter_state_to_string(reset_state)); 2683 2684 adapter->reset_reason = rwi->reset_reason; 2685 /* requestor of VNIC_RESET_CHANGE_PARAM already has the rtnl lock */ 2686 if (!(adapter->reset_reason == VNIC_RESET_CHANGE_PARAM)) 2687 rtnl_lock(); 2688 2689 /* Now that we have the rtnl lock, clear any pending failover. 2690 * This will ensure ibmvnic_open() has either completed or will 2691 * block until failover is complete. 2692 */ 2693 if (rwi->reset_reason == VNIC_RESET_FAILOVER) 2694 adapter->failover_pending = false; 2695 2696 /* read the state and check (again) after getting rtnl */ 2697 reset_state = adapter->state; 2698 2699 if (reset_state == VNIC_REMOVING || reset_state == VNIC_REMOVED) { 2700 rc = -EBUSY; 2701 goto out; 2702 } 2703 2704 netif_carrier_off(netdev); 2705 2706 old_num_rx_queues = adapter->req_rx_queues; 2707 old_num_tx_queues = adapter->req_tx_queues; 2708 old_num_rx_slots = adapter->req_rx_add_entries_per_subcrq; 2709 old_num_tx_slots = adapter->req_tx_entries_per_subcrq; 2710 2711 ibmvnic_cleanup(netdev); 2712 2713 if (reset_state == VNIC_OPEN && 2714 adapter->reset_reason != VNIC_RESET_MOBILITY && 2715 adapter->reset_reason != VNIC_RESET_FAILOVER) { 2716 if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) { 2717 rc = __ibmvnic_close(netdev); 2718 if (rc) 2719 goto out; 2720 } else { 2721 adapter->state = VNIC_CLOSING; 2722 2723 /* Release the RTNL lock before link state change and 2724 * re-acquire after the link state change to allow 2725 * linkwatch_event to grab the RTNL lock and run during 2726 * a reset. 2727 */ 2728 rtnl_unlock(); 2729 rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_DN); 2730 rtnl_lock(); 2731 if (rc) 2732 goto out; 2733 2734 if (adapter->state == VNIC_OPEN) { 2735 /* When we dropped rtnl, ibmvnic_open() got 2736 * it and noticed that we are resetting and 2737 * set the adapter state to OPEN. Update our 2738 * new "target" state, and resume the reset 2739 * from VNIC_CLOSING state. 2740 */ 2741 netdev_dbg(netdev, 2742 "Open changed state from %s, updating.\n", 2743 adapter_state_to_string(reset_state)); 2744 reset_state = VNIC_OPEN; 2745 adapter->state = VNIC_CLOSING; 2746 } 2747 2748 if (adapter->state != VNIC_CLOSING) { 2749 /* If someone else changed the adapter state 2750 * when we dropped the rtnl, fail the reset 2751 */ 2752 rc = -EAGAIN; 2753 goto out; 2754 } 2755 adapter->state = VNIC_CLOSED; 2756 } 2757 } 2758 2759 if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) { 2760 release_resources(adapter); 2761 release_sub_crqs(adapter, 1); 2762 release_crq_queue(adapter); 2763 } 2764 2765 if (adapter->reset_reason != VNIC_RESET_NON_FATAL) { 2766 /* remove the closed state so when we call open it appears 2767 * we are coming from the probed state. 2768 */ 2769 adapter->state = VNIC_PROBED; 2770 2771 reinit_init_done(adapter); 2772 2773 if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) { 2774 rc = init_crq_queue(adapter); 2775 } else if (adapter->reset_reason == VNIC_RESET_MOBILITY) { 2776 rc = ibmvnic_reenable_crq_queue(adapter); 2777 release_sub_crqs(adapter, 1); 2778 } else { 2779 rc = ibmvnic_reset_crq(adapter); 2780 if (rc == H_CLOSED || rc == H_SUCCESS) { 2781 rc = vio_enable_interrupts(adapter->vdev); 2782 if (rc) 2783 netdev_err(adapter->netdev, 2784 "Reset failed to enable interrupts. rc=%d\n", 2785 rc); 2786 } 2787 } 2788 2789 if (rc) { 2790 netdev_err(adapter->netdev, 2791 "Reset couldn't initialize crq. rc=%d\n", rc); 2792 goto out; 2793 } 2794 2795 rc = ibmvnic_reset_init(adapter, true); 2796 if (rc) 2797 goto out; 2798 2799 /* If the adapter was in PROBE or DOWN state prior to the reset, 2800 * exit here. 2801 */ 2802 if (reset_state == VNIC_PROBED || reset_state == VNIC_DOWN) { 2803 rc = 0; 2804 goto out; 2805 } 2806 2807 rc = ibmvnic_login(netdev); 2808 if (rc) 2809 goto out; 2810 2811 if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) { 2812 rc = init_resources(adapter); 2813 if (rc) 2814 goto out; 2815 } else if (adapter->req_rx_queues != old_num_rx_queues || 2816 adapter->req_tx_queues != old_num_tx_queues || 2817 adapter->req_rx_add_entries_per_subcrq != 2818 old_num_rx_slots || 2819 adapter->req_tx_entries_per_subcrq != 2820 old_num_tx_slots || 2821 !adapter->rx_pool || 2822 !adapter->tso_pool || 2823 !adapter->tx_pool) { 2824 release_napi(adapter); 2825 release_vpd_data(adapter); 2826 2827 rc = init_resources(adapter); 2828 if (rc) 2829 goto out; 2830 2831 } else { 2832 rc = init_tx_pools(netdev); 2833 if (rc) { 2834 netdev_dbg(netdev, 2835 "init tx pools failed (%d)\n", 2836 rc); 2837 goto out; 2838 } 2839 2840 rc = init_rx_pools(netdev); 2841 if (rc) { 2842 netdev_dbg(netdev, 2843 "init rx pools failed (%d)\n", 2844 rc); 2845 goto out; 2846 } 2847 } 2848 ibmvnic_disable_irqs(adapter); 2849 } 2850 adapter->state = VNIC_CLOSED; 2851 2852 if (reset_state == VNIC_CLOSED) { 2853 rc = 0; 2854 goto out; 2855 } 2856 2857 rc = __ibmvnic_open(netdev); 2858 if (rc) { 2859 rc = IBMVNIC_OPEN_FAILED; 2860 goto out; 2861 } 2862 2863 /* refresh device's multicast list */ 2864 ibmvnic_set_multi(netdev); 2865 2866 if (adapter->reset_reason == VNIC_RESET_FAILOVER || 2867 adapter->reset_reason == VNIC_RESET_MOBILITY) 2868 __netdev_notify_peers(netdev); 2869 2870 rc = 0; 2871 2872 out: 2873 /* restore the adapter state if reset failed */ 2874 if (rc) 2875 adapter->state = reset_state; 2876 /* requestor of VNIC_RESET_CHANGE_PARAM should still hold the rtnl lock */ 2877 if (!(adapter->reset_reason == VNIC_RESET_CHANGE_PARAM)) 2878 rtnl_unlock(); 2879 2880 netdev_dbg(adapter->netdev, "[S:%s FOP:%d] Reset done, rc %d\n", 2881 adapter_state_to_string(adapter->state), 2882 adapter->failover_pending, rc); 2883 return rc; 2884 } 2885 2886 static int do_hard_reset(struct ibmvnic_adapter *adapter, 2887 struct ibmvnic_rwi *rwi, u32 reset_state) 2888 { 2889 struct net_device *netdev = adapter->netdev; 2890 int rc; 2891 2892 netdev_dbg(adapter->netdev, "Hard resetting driver (%s)\n", 2893 reset_reason_to_string(rwi->reset_reason)); 2894 2895 /* read the state and check (again) after getting rtnl */ 2896 reset_state = adapter->state; 2897 2898 if (reset_state == VNIC_REMOVING || reset_state == VNIC_REMOVED) { 2899 rc = -EBUSY; 2900 goto out; 2901 } 2902 2903 netif_carrier_off(netdev); 2904 adapter->reset_reason = rwi->reset_reason; 2905 2906 ibmvnic_cleanup(netdev); 2907 release_resources(adapter); 2908 release_sub_crqs(adapter, 0); 2909 release_crq_queue(adapter); 2910 2911 /* remove the closed state so when we call open it appears 2912 * we are coming from the probed state. 2913 */ 2914 adapter->state = VNIC_PROBED; 2915 2916 reinit_init_done(adapter); 2917 2918 rc = init_crq_queue(adapter); 2919 if (rc) { 2920 netdev_err(adapter->netdev, 2921 "Couldn't initialize crq. rc=%d\n", rc); 2922 goto out; 2923 } 2924 2925 rc = ibmvnic_reset_init(adapter, false); 2926 if (rc) 2927 goto out; 2928 2929 /* If the adapter was in PROBE or DOWN state prior to the reset, 2930 * exit here. 2931 */ 2932 if (reset_state == VNIC_PROBED || reset_state == VNIC_DOWN) 2933 goto out; 2934 2935 rc = ibmvnic_login(netdev); 2936 if (rc) 2937 goto out; 2938 2939 rc = init_resources(adapter); 2940 if (rc) 2941 goto out; 2942 2943 ibmvnic_disable_irqs(adapter); 2944 adapter->state = VNIC_CLOSED; 2945 2946 if (reset_state == VNIC_CLOSED) 2947 goto out; 2948 2949 rc = __ibmvnic_open(netdev); 2950 if (rc) { 2951 rc = IBMVNIC_OPEN_FAILED; 2952 goto out; 2953 } 2954 2955 __netdev_notify_peers(netdev); 2956 out: 2957 /* restore adapter state if reset failed */ 2958 if (rc) 2959 adapter->state = reset_state; 2960 netdev_dbg(adapter->netdev, "[S:%s FOP:%d] Hard reset done, rc %d\n", 2961 adapter_state_to_string(adapter->state), 2962 adapter->failover_pending, rc); 2963 return rc; 2964 } 2965 2966 static struct ibmvnic_rwi *get_next_rwi(struct ibmvnic_adapter *adapter) 2967 { 2968 struct ibmvnic_rwi *rwi; 2969 unsigned long flags; 2970 2971 spin_lock_irqsave(&adapter->rwi_lock, flags); 2972 2973 if (!list_empty(&adapter->rwi_list)) { 2974 rwi = list_first_entry(&adapter->rwi_list, struct ibmvnic_rwi, 2975 list); 2976 list_del(&rwi->list); 2977 } else { 2978 rwi = NULL; 2979 } 2980 2981 spin_unlock_irqrestore(&adapter->rwi_lock, flags); 2982 return rwi; 2983 } 2984 2985 /** 2986 * do_passive_init - complete probing when partner device is detected. 2987 * @adapter: ibmvnic_adapter struct 2988 * 2989 * If the ibmvnic device does not have a partner device to communicate with at boot 2990 * and that partner device comes online at a later time, this function is called 2991 * to complete the initialization process of ibmvnic device. 2992 * Caller is expected to hold rtnl_lock(). 2993 * 2994 * Returns non-zero if sub-CRQs are not initialized properly leaving the device 2995 * in the down state. 2996 * Returns 0 upon success and the device is in PROBED state. 2997 */ 2998 2999 static int do_passive_init(struct ibmvnic_adapter *adapter) 3000 { 3001 unsigned long timeout = msecs_to_jiffies(30000); 3002 struct net_device *netdev = adapter->netdev; 3003 struct device *dev = &adapter->vdev->dev; 3004 int rc; 3005 3006 netdev_dbg(netdev, "Partner device found, probing.\n"); 3007 3008 adapter->state = VNIC_PROBING; 3009 reinit_completion(&adapter->init_done); 3010 adapter->init_done_rc = 0; 3011 adapter->crq.active = true; 3012 3013 rc = send_crq_init_complete(adapter); 3014 if (rc) 3015 goto out; 3016 3017 rc = send_version_xchg(adapter); 3018 if (rc) 3019 netdev_dbg(adapter->netdev, "send_version_xchg failed, rc=%d\n", rc); 3020 3021 if (!wait_for_completion_timeout(&adapter->init_done, timeout)) { 3022 dev_err(dev, "Initialization sequence timed out\n"); 3023 rc = -ETIMEDOUT; 3024 goto out; 3025 } 3026 3027 rc = init_sub_crqs(adapter); 3028 if (rc) { 3029 dev_err(dev, "Initialization of sub crqs failed, rc=%d\n", rc); 3030 goto out; 3031 } 3032 3033 rc = init_sub_crq_irqs(adapter); 3034 if (rc) { 3035 dev_err(dev, "Failed to initialize sub crq irqs\n, rc=%d", rc); 3036 goto init_failed; 3037 } 3038 3039 netdev->mtu = adapter->req_mtu - ETH_HLEN; 3040 netdev->min_mtu = adapter->min_mtu - ETH_HLEN; 3041 netdev->max_mtu = adapter->max_mtu - ETH_HLEN; 3042 3043 adapter->state = VNIC_PROBED; 3044 netdev_dbg(netdev, "Probed successfully. Waiting for signal from partner device.\n"); 3045 3046 return 0; 3047 3048 init_failed: 3049 release_sub_crqs(adapter, 1); 3050 out: 3051 adapter->state = VNIC_DOWN; 3052 return rc; 3053 } 3054 3055 static void __ibmvnic_reset(struct work_struct *work) 3056 { 3057 struct ibmvnic_adapter *adapter; 3058 unsigned int timeout = 5000; 3059 struct ibmvnic_rwi *tmprwi; 3060 bool saved_state = false; 3061 struct ibmvnic_rwi *rwi; 3062 unsigned long flags; 3063 struct device *dev; 3064 bool need_reset; 3065 int num_fails = 0; 3066 u32 reset_state; 3067 int rc = 0; 3068 3069 adapter = container_of(work, struct ibmvnic_adapter, ibmvnic_reset); 3070 dev = &adapter->vdev->dev; 3071 3072 /* Wait for ibmvnic_probe() to complete. If probe is taking too long 3073 * or if another reset is in progress, defer work for now. If probe 3074 * eventually fails it will flush and terminate our work. 3075 * 3076 * Three possibilities here: 3077 * 1. Adpater being removed - just return 3078 * 2. Timed out on probe or another reset in progress - delay the work 3079 * 3. Completed probe - perform any resets in queue 3080 */ 3081 if (adapter->state == VNIC_PROBING && 3082 !wait_for_completion_timeout(&adapter->probe_done, timeout)) { 3083 dev_err(dev, "Reset thread timed out on probe"); 3084 queue_delayed_work(system_long_wq, 3085 &adapter->ibmvnic_delayed_reset, 3086 IBMVNIC_RESET_DELAY); 3087 return; 3088 } 3089 3090 /* adapter is done with probe (i.e state is never VNIC_PROBING now) */ 3091 if (adapter->state == VNIC_REMOVING) 3092 return; 3093 3094 /* ->rwi_list is stable now (no one else is removing entries) */ 3095 3096 /* ibmvnic_probe() may have purged the reset queue after we were 3097 * scheduled to process a reset so there maybe no resets to process. 3098 * Before setting the ->resetting bit though, we have to make sure 3099 * that there is infact a reset to process. Otherwise we may race 3100 * with ibmvnic_open() and end up leaving the vnic down: 3101 * 3102 * __ibmvnic_reset() ibmvnic_open() 3103 * ----------------- -------------- 3104 * 3105 * set ->resetting bit 3106 * find ->resetting bit is set 3107 * set ->state to IBMVNIC_OPEN (i.e 3108 * assume reset will open device) 3109 * return 3110 * find reset queue empty 3111 * return 3112 * 3113 * Neither performed vnic login/open and vnic stays down 3114 * 3115 * If we hold the lock and conditionally set the bit, either we 3116 * or ibmvnic_open() will complete the open. 3117 */ 3118 need_reset = false; 3119 spin_lock(&adapter->rwi_lock); 3120 if (!list_empty(&adapter->rwi_list)) { 3121 if (test_and_set_bit_lock(0, &adapter->resetting)) { 3122 queue_delayed_work(system_long_wq, 3123 &adapter->ibmvnic_delayed_reset, 3124 IBMVNIC_RESET_DELAY); 3125 } else { 3126 need_reset = true; 3127 } 3128 } 3129 spin_unlock(&adapter->rwi_lock); 3130 3131 if (!need_reset) 3132 return; 3133 3134 rwi = get_next_rwi(adapter); 3135 while (rwi) { 3136 spin_lock_irqsave(&adapter->state_lock, flags); 3137 3138 if (adapter->state == VNIC_REMOVING || 3139 adapter->state == VNIC_REMOVED) { 3140 spin_unlock_irqrestore(&adapter->state_lock, flags); 3141 kfree(rwi); 3142 rc = EBUSY; 3143 break; 3144 } 3145 3146 if (!saved_state) { 3147 reset_state = adapter->state; 3148 saved_state = true; 3149 } 3150 spin_unlock_irqrestore(&adapter->state_lock, flags); 3151 3152 if (rwi->reset_reason == VNIC_RESET_PASSIVE_INIT) { 3153 rtnl_lock(); 3154 rc = do_passive_init(adapter); 3155 rtnl_unlock(); 3156 if (!rc) 3157 netif_carrier_on(adapter->netdev); 3158 } else if (adapter->force_reset_recovery) { 3159 /* Since we are doing a hard reset now, clear the 3160 * failover_pending flag so we don't ignore any 3161 * future MOBILITY or other resets. 3162 */ 3163 adapter->failover_pending = false; 3164 3165 /* Transport event occurred during previous reset */ 3166 if (adapter->wait_for_reset) { 3167 /* Previous was CHANGE_PARAM; caller locked */ 3168 adapter->force_reset_recovery = false; 3169 rc = do_hard_reset(adapter, rwi, reset_state); 3170 } else { 3171 rtnl_lock(); 3172 adapter->force_reset_recovery = false; 3173 rc = do_hard_reset(adapter, rwi, reset_state); 3174 rtnl_unlock(); 3175 } 3176 if (rc) 3177 num_fails++; 3178 else 3179 num_fails = 0; 3180 3181 /* If auto-priority-failover is enabled we can get 3182 * back to back failovers during resets, resulting 3183 * in at least two failed resets (from high-priority 3184 * backing device to low-priority one and then back) 3185 * If resets continue to fail beyond that, give the 3186 * adapter some time to settle down before retrying. 3187 */ 3188 if (num_fails >= 3) { 3189 netdev_dbg(adapter->netdev, 3190 "[S:%s] Hard reset failed %d times, waiting 60 secs\n", 3191 adapter_state_to_string(adapter->state), 3192 num_fails); 3193 set_current_state(TASK_UNINTERRUPTIBLE); 3194 schedule_timeout(60 * HZ); 3195 } 3196 } else { 3197 rc = do_reset(adapter, rwi, reset_state); 3198 } 3199 tmprwi = rwi; 3200 adapter->last_reset_time = jiffies; 3201 3202 if (rc) 3203 netdev_dbg(adapter->netdev, "Reset failed, rc=%d\n", rc); 3204 3205 rwi = get_next_rwi(adapter); 3206 3207 /* 3208 * If there are no resets queued and the previous reset failed, 3209 * the adapter would be in an undefined state. So retry the 3210 * previous reset as a hard reset. 3211 * 3212 * Else, free the previous rwi and, if there is another reset 3213 * queued, process the new reset even if previous reset failed 3214 * (the previous reset could have failed because of a fail 3215 * over for instance, so process the fail over). 3216 */ 3217 if (!rwi && rc) 3218 rwi = tmprwi; 3219 else 3220 kfree(tmprwi); 3221 3222 if (rwi && (rwi->reset_reason == VNIC_RESET_FAILOVER || 3223 rwi->reset_reason == VNIC_RESET_MOBILITY || rc)) 3224 adapter->force_reset_recovery = true; 3225 } 3226 3227 if (adapter->wait_for_reset) { 3228 adapter->reset_done_rc = rc; 3229 complete(&adapter->reset_done); 3230 } 3231 3232 clear_bit_unlock(0, &adapter->resetting); 3233 3234 netdev_dbg(adapter->netdev, 3235 "[S:%s FRR:%d WFR:%d] Done processing resets\n", 3236 adapter_state_to_string(adapter->state), 3237 adapter->force_reset_recovery, 3238 adapter->wait_for_reset); 3239 } 3240 3241 static void __ibmvnic_delayed_reset(struct work_struct *work) 3242 { 3243 struct ibmvnic_adapter *adapter; 3244 3245 adapter = container_of(work, struct ibmvnic_adapter, 3246 ibmvnic_delayed_reset.work); 3247 __ibmvnic_reset(&adapter->ibmvnic_reset); 3248 } 3249 3250 static void flush_reset_queue(struct ibmvnic_adapter *adapter) 3251 { 3252 struct list_head *entry, *tmp_entry; 3253 3254 if (!list_empty(&adapter->rwi_list)) { 3255 list_for_each_safe(entry, tmp_entry, &adapter->rwi_list) { 3256 list_del(entry); 3257 kfree(list_entry(entry, struct ibmvnic_rwi, list)); 3258 } 3259 } 3260 } 3261 3262 static int ibmvnic_reset(struct ibmvnic_adapter *adapter, 3263 enum ibmvnic_reset_reason reason) 3264 { 3265 struct net_device *netdev = adapter->netdev; 3266 struct ibmvnic_rwi *rwi, *tmp; 3267 unsigned long flags; 3268 int ret; 3269 3270 spin_lock_irqsave(&adapter->rwi_lock, flags); 3271 3272 /* If failover is pending don't schedule any other reset. 3273 * Instead let the failover complete. If there is already a 3274 * a failover reset scheduled, we will detect and drop the 3275 * duplicate reset when walking the ->rwi_list below. 3276 */ 3277 if (adapter->state == VNIC_REMOVING || 3278 adapter->state == VNIC_REMOVED || 3279 (adapter->failover_pending && reason != VNIC_RESET_FAILOVER)) { 3280 ret = EBUSY; 3281 netdev_dbg(netdev, "Adapter removing or pending failover, skipping reset\n"); 3282 goto err; 3283 } 3284 3285 list_for_each_entry(tmp, &adapter->rwi_list, list) { 3286 if (tmp->reset_reason == reason) { 3287 netdev_dbg(netdev, "Skipping matching reset, reason=%s\n", 3288 reset_reason_to_string(reason)); 3289 ret = EBUSY; 3290 goto err; 3291 } 3292 } 3293 3294 rwi = kzalloc(sizeof(*rwi), GFP_ATOMIC); 3295 if (!rwi) { 3296 ret = ENOMEM; 3297 goto err; 3298 } 3299 /* if we just received a transport event, 3300 * flush reset queue and process this reset 3301 */ 3302 if (adapter->force_reset_recovery) 3303 flush_reset_queue(adapter); 3304 3305 rwi->reset_reason = reason; 3306 list_add_tail(&rwi->list, &adapter->rwi_list); 3307 netdev_dbg(adapter->netdev, "Scheduling reset (reason %s)\n", 3308 reset_reason_to_string(reason)); 3309 queue_work(system_long_wq, &adapter->ibmvnic_reset); 3310 3311 ret = 0; 3312 err: 3313 /* ibmvnic_close() below can block, so drop the lock first */ 3314 spin_unlock_irqrestore(&adapter->rwi_lock, flags); 3315 3316 if (ret == ENOMEM) 3317 ibmvnic_close(netdev); 3318 3319 return -ret; 3320 } 3321 3322 static void ibmvnic_tx_timeout(struct net_device *dev, unsigned int txqueue) 3323 { 3324 struct ibmvnic_adapter *adapter = netdev_priv(dev); 3325 3326 if (test_bit(0, &adapter->resetting)) { 3327 netdev_err(adapter->netdev, 3328 "Adapter is resetting, skip timeout reset\n"); 3329 return; 3330 } 3331 /* No queuing up reset until at least 5 seconds (default watchdog val) 3332 * after last reset 3333 */ 3334 if (time_before(jiffies, (adapter->last_reset_time + dev->watchdog_timeo))) { 3335 netdev_dbg(dev, "Not yet time to tx timeout.\n"); 3336 return; 3337 } 3338 ibmvnic_reset(adapter, VNIC_RESET_TIMEOUT); 3339 } 3340 3341 static void remove_buff_from_pool(struct ibmvnic_adapter *adapter, 3342 struct ibmvnic_rx_buff *rx_buff) 3343 { 3344 struct ibmvnic_rx_pool *pool = &adapter->rx_pool[rx_buff->pool_index]; 3345 3346 rx_buff->skb = NULL; 3347 3348 pool->free_map[pool->next_alloc] = (int)(rx_buff - pool->rx_buff); 3349 pool->next_alloc = (pool->next_alloc + 1) % pool->size; 3350 3351 atomic_dec(&pool->available); 3352 } 3353 3354 static int ibmvnic_poll(struct napi_struct *napi, int budget) 3355 { 3356 struct ibmvnic_sub_crq_queue *rx_scrq; 3357 struct ibmvnic_adapter *adapter; 3358 struct net_device *netdev; 3359 int frames_processed; 3360 int scrq_num; 3361 3362 netdev = napi->dev; 3363 adapter = netdev_priv(netdev); 3364 scrq_num = (int)(napi - adapter->napi); 3365 frames_processed = 0; 3366 rx_scrq = adapter->rx_scrq[scrq_num]; 3367 3368 restart_poll: 3369 while (frames_processed < budget) { 3370 struct sk_buff *skb; 3371 struct ibmvnic_rx_buff *rx_buff; 3372 union sub_crq *next; 3373 u32 length; 3374 u16 offset; 3375 u8 flags = 0; 3376 3377 if (unlikely(test_bit(0, &adapter->resetting) && 3378 adapter->reset_reason != VNIC_RESET_NON_FATAL)) { 3379 enable_scrq_irq(adapter, rx_scrq); 3380 napi_complete_done(napi, frames_processed); 3381 return frames_processed; 3382 } 3383 3384 if (!pending_scrq(adapter, rx_scrq)) 3385 break; 3386 next = ibmvnic_next_scrq(adapter, rx_scrq); 3387 rx_buff = (struct ibmvnic_rx_buff *) 3388 be64_to_cpu(next->rx_comp.correlator); 3389 /* do error checking */ 3390 if (next->rx_comp.rc) { 3391 netdev_dbg(netdev, "rx buffer returned with rc %x\n", 3392 be16_to_cpu(next->rx_comp.rc)); 3393 /* free the entry */ 3394 next->rx_comp.first = 0; 3395 dev_kfree_skb_any(rx_buff->skb); 3396 remove_buff_from_pool(adapter, rx_buff); 3397 continue; 3398 } else if (!rx_buff->skb) { 3399 /* free the entry */ 3400 next->rx_comp.first = 0; 3401 remove_buff_from_pool(adapter, rx_buff); 3402 continue; 3403 } 3404 3405 length = be32_to_cpu(next->rx_comp.len); 3406 offset = be16_to_cpu(next->rx_comp.off_frame_data); 3407 flags = next->rx_comp.flags; 3408 skb = rx_buff->skb; 3409 /* load long_term_buff before copying to skb */ 3410 dma_rmb(); 3411 skb_copy_to_linear_data(skb, rx_buff->data + offset, 3412 length); 3413 3414 /* VLAN Header has been stripped by the system firmware and 3415 * needs to be inserted by the driver 3416 */ 3417 if (adapter->rx_vlan_header_insertion && 3418 (flags & IBMVNIC_VLAN_STRIPPED)) 3419 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), 3420 ntohs(next->rx_comp.vlan_tci)); 3421 3422 /* free the entry */ 3423 next->rx_comp.first = 0; 3424 remove_buff_from_pool(adapter, rx_buff); 3425 3426 skb_put(skb, length); 3427 skb->protocol = eth_type_trans(skb, netdev); 3428 skb_record_rx_queue(skb, scrq_num); 3429 3430 if (flags & IBMVNIC_IP_CHKSUM_GOOD && 3431 flags & IBMVNIC_TCP_UDP_CHKSUM_GOOD) { 3432 skb->ip_summed = CHECKSUM_UNNECESSARY; 3433 } 3434 3435 length = skb->len; 3436 napi_gro_receive(napi, skb); /* send it up */ 3437 netdev->stats.rx_packets++; 3438 netdev->stats.rx_bytes += length; 3439 adapter->rx_stats_buffers[scrq_num].packets++; 3440 adapter->rx_stats_buffers[scrq_num].bytes += length; 3441 frames_processed++; 3442 } 3443 3444 if (adapter->state != VNIC_CLOSING && 3445 ((atomic_read(&adapter->rx_pool[scrq_num].available) < 3446 adapter->req_rx_add_entries_per_subcrq / 2) || 3447 frames_processed < budget)) 3448 replenish_rx_pool(adapter, &adapter->rx_pool[scrq_num]); 3449 if (frames_processed < budget) { 3450 if (napi_complete_done(napi, frames_processed)) { 3451 enable_scrq_irq(adapter, rx_scrq); 3452 if (pending_scrq(adapter, rx_scrq)) { 3453 if (napi_reschedule(napi)) { 3454 disable_scrq_irq(adapter, rx_scrq); 3455 goto restart_poll; 3456 } 3457 } 3458 } 3459 } 3460 return frames_processed; 3461 } 3462 3463 static int wait_for_reset(struct ibmvnic_adapter *adapter) 3464 { 3465 int rc, ret; 3466 3467 adapter->fallback.mtu = adapter->req_mtu; 3468 adapter->fallback.rx_queues = adapter->req_rx_queues; 3469 adapter->fallback.tx_queues = adapter->req_tx_queues; 3470 adapter->fallback.rx_entries = adapter->req_rx_add_entries_per_subcrq; 3471 adapter->fallback.tx_entries = adapter->req_tx_entries_per_subcrq; 3472 3473 reinit_completion(&adapter->reset_done); 3474 adapter->wait_for_reset = true; 3475 rc = ibmvnic_reset(adapter, VNIC_RESET_CHANGE_PARAM); 3476 3477 if (rc) { 3478 ret = rc; 3479 goto out; 3480 } 3481 rc = ibmvnic_wait_for_completion(adapter, &adapter->reset_done, 60000); 3482 if (rc) { 3483 ret = -ENODEV; 3484 goto out; 3485 } 3486 3487 ret = 0; 3488 if (adapter->reset_done_rc) { 3489 ret = -EIO; 3490 adapter->desired.mtu = adapter->fallback.mtu; 3491 adapter->desired.rx_queues = adapter->fallback.rx_queues; 3492 adapter->desired.tx_queues = adapter->fallback.tx_queues; 3493 adapter->desired.rx_entries = adapter->fallback.rx_entries; 3494 adapter->desired.tx_entries = adapter->fallback.tx_entries; 3495 3496 reinit_completion(&adapter->reset_done); 3497 adapter->wait_for_reset = true; 3498 rc = ibmvnic_reset(adapter, VNIC_RESET_CHANGE_PARAM); 3499 if (rc) { 3500 ret = rc; 3501 goto out; 3502 } 3503 rc = ibmvnic_wait_for_completion(adapter, &adapter->reset_done, 3504 60000); 3505 if (rc) { 3506 ret = -ENODEV; 3507 goto out; 3508 } 3509 } 3510 out: 3511 adapter->wait_for_reset = false; 3512 3513 return ret; 3514 } 3515 3516 static int ibmvnic_change_mtu(struct net_device *netdev, int new_mtu) 3517 { 3518 struct ibmvnic_adapter *adapter = netdev_priv(netdev); 3519 3520 adapter->desired.mtu = new_mtu + ETH_HLEN; 3521 3522 return wait_for_reset(adapter); 3523 } 3524 3525 static netdev_features_t ibmvnic_features_check(struct sk_buff *skb, 3526 struct net_device *dev, 3527 netdev_features_t features) 3528 { 3529 /* Some backing hardware adapters can not 3530 * handle packets with a MSS less than 224 3531 * or with only one segment. 3532 */ 3533 if (skb_is_gso(skb)) { 3534 if (skb_shinfo(skb)->gso_size < 224 || 3535 skb_shinfo(skb)->gso_segs == 1) 3536 features &= ~NETIF_F_GSO_MASK; 3537 } 3538 3539 return features; 3540 } 3541 3542 static const struct net_device_ops ibmvnic_netdev_ops = { 3543 .ndo_open = ibmvnic_open, 3544 .ndo_stop = ibmvnic_close, 3545 .ndo_start_xmit = ibmvnic_xmit, 3546 .ndo_set_rx_mode = ibmvnic_set_multi, 3547 .ndo_set_mac_address = ibmvnic_set_mac, 3548 .ndo_validate_addr = eth_validate_addr, 3549 .ndo_tx_timeout = ibmvnic_tx_timeout, 3550 .ndo_change_mtu = ibmvnic_change_mtu, 3551 .ndo_features_check = ibmvnic_features_check, 3552 }; 3553 3554 /* ethtool functions */ 3555 3556 static int ibmvnic_get_link_ksettings(struct net_device *netdev, 3557 struct ethtool_link_ksettings *cmd) 3558 { 3559 struct ibmvnic_adapter *adapter = netdev_priv(netdev); 3560 int rc; 3561 3562 rc = send_query_phys_parms(adapter); 3563 if (rc) { 3564 adapter->speed = SPEED_UNKNOWN; 3565 adapter->duplex = DUPLEX_UNKNOWN; 3566 } 3567 cmd->base.speed = adapter->speed; 3568 cmd->base.duplex = adapter->duplex; 3569 cmd->base.port = PORT_FIBRE; 3570 cmd->base.phy_address = 0; 3571 cmd->base.autoneg = AUTONEG_ENABLE; 3572 3573 return 0; 3574 } 3575 3576 static void ibmvnic_get_drvinfo(struct net_device *netdev, 3577 struct ethtool_drvinfo *info) 3578 { 3579 struct ibmvnic_adapter *adapter = netdev_priv(netdev); 3580 3581 strscpy(info->driver, ibmvnic_driver_name, sizeof(info->driver)); 3582 strscpy(info->version, IBMVNIC_DRIVER_VERSION, sizeof(info->version)); 3583 strscpy(info->fw_version, adapter->fw_version, 3584 sizeof(info->fw_version)); 3585 } 3586 3587 static u32 ibmvnic_get_msglevel(struct net_device *netdev) 3588 { 3589 struct ibmvnic_adapter *adapter = netdev_priv(netdev); 3590 3591 return adapter->msg_enable; 3592 } 3593 3594 static void ibmvnic_set_msglevel(struct net_device *netdev, u32 data) 3595 { 3596 struct ibmvnic_adapter *adapter = netdev_priv(netdev); 3597 3598 adapter->msg_enable = data; 3599 } 3600 3601 static u32 ibmvnic_get_link(struct net_device *netdev) 3602 { 3603 struct ibmvnic_adapter *adapter = netdev_priv(netdev); 3604 3605 /* Don't need to send a query because we request a logical link up at 3606 * init and then we wait for link state indications 3607 */ 3608 return adapter->logical_link_state; 3609 } 3610 3611 static void ibmvnic_get_ringparam(struct net_device *netdev, 3612 struct ethtool_ringparam *ring, 3613 struct kernel_ethtool_ringparam *kernel_ring, 3614 struct netlink_ext_ack *extack) 3615 { 3616 struct ibmvnic_adapter *adapter = netdev_priv(netdev); 3617 3618 ring->rx_max_pending = adapter->max_rx_add_entries_per_subcrq; 3619 ring->tx_max_pending = adapter->max_tx_entries_per_subcrq; 3620 ring->rx_mini_max_pending = 0; 3621 ring->rx_jumbo_max_pending = 0; 3622 ring->rx_pending = adapter->req_rx_add_entries_per_subcrq; 3623 ring->tx_pending = adapter->req_tx_entries_per_subcrq; 3624 ring->rx_mini_pending = 0; 3625 ring->rx_jumbo_pending = 0; 3626 } 3627 3628 static int ibmvnic_set_ringparam(struct net_device *netdev, 3629 struct ethtool_ringparam *ring, 3630 struct kernel_ethtool_ringparam *kernel_ring, 3631 struct netlink_ext_ack *extack) 3632 { 3633 struct ibmvnic_adapter *adapter = netdev_priv(netdev); 3634 3635 if (ring->rx_pending > adapter->max_rx_add_entries_per_subcrq || 3636 ring->tx_pending > adapter->max_tx_entries_per_subcrq) { 3637 netdev_err(netdev, "Invalid request.\n"); 3638 netdev_err(netdev, "Max tx buffers = %llu\n", 3639 adapter->max_rx_add_entries_per_subcrq); 3640 netdev_err(netdev, "Max rx buffers = %llu\n", 3641 adapter->max_tx_entries_per_subcrq); 3642 return -EINVAL; 3643 } 3644 3645 adapter->desired.rx_entries = ring->rx_pending; 3646 adapter->desired.tx_entries = ring->tx_pending; 3647 3648 return wait_for_reset(adapter); 3649 } 3650 3651 static void ibmvnic_get_channels(struct net_device *netdev, 3652 struct ethtool_channels *channels) 3653 { 3654 struct ibmvnic_adapter *adapter = netdev_priv(netdev); 3655 3656 channels->max_rx = adapter->max_rx_queues; 3657 channels->max_tx = adapter->max_tx_queues; 3658 channels->max_other = 0; 3659 channels->max_combined = 0; 3660 channels->rx_count = adapter->req_rx_queues; 3661 channels->tx_count = adapter->req_tx_queues; 3662 channels->other_count = 0; 3663 channels->combined_count = 0; 3664 } 3665 3666 static int ibmvnic_set_channels(struct net_device *netdev, 3667 struct ethtool_channels *channels) 3668 { 3669 struct ibmvnic_adapter *adapter = netdev_priv(netdev); 3670 3671 adapter->desired.rx_queues = channels->rx_count; 3672 adapter->desired.tx_queues = channels->tx_count; 3673 3674 return wait_for_reset(adapter); 3675 } 3676 3677 static void ibmvnic_get_strings(struct net_device *dev, u32 stringset, u8 *data) 3678 { 3679 struct ibmvnic_adapter *adapter = netdev_priv(dev); 3680 int i; 3681 3682 if (stringset != ETH_SS_STATS) 3683 return; 3684 3685 for (i = 0; i < ARRAY_SIZE(ibmvnic_stats); i++, data += ETH_GSTRING_LEN) 3686 memcpy(data, ibmvnic_stats[i].name, ETH_GSTRING_LEN); 3687 3688 for (i = 0; i < adapter->req_tx_queues; i++) { 3689 snprintf(data, ETH_GSTRING_LEN, "tx%d_packets", i); 3690 data += ETH_GSTRING_LEN; 3691 3692 snprintf(data, ETH_GSTRING_LEN, "tx%d_bytes", i); 3693 data += ETH_GSTRING_LEN; 3694 3695 snprintf(data, ETH_GSTRING_LEN, "tx%d_dropped_packets", i); 3696 data += ETH_GSTRING_LEN; 3697 } 3698 3699 for (i = 0; i < adapter->req_rx_queues; i++) { 3700 snprintf(data, ETH_GSTRING_LEN, "rx%d_packets", i); 3701 data += ETH_GSTRING_LEN; 3702 3703 snprintf(data, ETH_GSTRING_LEN, "rx%d_bytes", i); 3704 data += ETH_GSTRING_LEN; 3705 3706 snprintf(data, ETH_GSTRING_LEN, "rx%d_interrupts", i); 3707 data += ETH_GSTRING_LEN; 3708 } 3709 } 3710 3711 static int ibmvnic_get_sset_count(struct net_device *dev, int sset) 3712 { 3713 struct ibmvnic_adapter *adapter = netdev_priv(dev); 3714 3715 switch (sset) { 3716 case ETH_SS_STATS: 3717 return ARRAY_SIZE(ibmvnic_stats) + 3718 adapter->req_tx_queues * NUM_TX_STATS + 3719 adapter->req_rx_queues * NUM_RX_STATS; 3720 default: 3721 return -EOPNOTSUPP; 3722 } 3723 } 3724 3725 static void ibmvnic_get_ethtool_stats(struct net_device *dev, 3726 struct ethtool_stats *stats, u64 *data) 3727 { 3728 struct ibmvnic_adapter *adapter = netdev_priv(dev); 3729 union ibmvnic_crq crq; 3730 int i, j; 3731 int rc; 3732 3733 memset(&crq, 0, sizeof(crq)); 3734 crq.request_statistics.first = IBMVNIC_CRQ_CMD; 3735 crq.request_statistics.cmd = REQUEST_STATISTICS; 3736 crq.request_statistics.ioba = cpu_to_be32(adapter->stats_token); 3737 crq.request_statistics.len = 3738 cpu_to_be32(sizeof(struct ibmvnic_statistics)); 3739 3740 /* Wait for data to be written */ 3741 reinit_completion(&adapter->stats_done); 3742 rc = ibmvnic_send_crq(adapter, &crq); 3743 if (rc) 3744 return; 3745 rc = ibmvnic_wait_for_completion(adapter, &adapter->stats_done, 10000); 3746 if (rc) 3747 return; 3748 3749 for (i = 0; i < ARRAY_SIZE(ibmvnic_stats); i++) 3750 data[i] = be64_to_cpu(IBMVNIC_GET_STAT 3751 (adapter, ibmvnic_stats[i].offset)); 3752 3753 for (j = 0; j < adapter->req_tx_queues; j++) { 3754 data[i] = adapter->tx_stats_buffers[j].packets; 3755 i++; 3756 data[i] = adapter->tx_stats_buffers[j].bytes; 3757 i++; 3758 data[i] = adapter->tx_stats_buffers[j].dropped_packets; 3759 i++; 3760 } 3761 3762 for (j = 0; j < adapter->req_rx_queues; j++) { 3763 data[i] = adapter->rx_stats_buffers[j].packets; 3764 i++; 3765 data[i] = adapter->rx_stats_buffers[j].bytes; 3766 i++; 3767 data[i] = adapter->rx_stats_buffers[j].interrupts; 3768 i++; 3769 } 3770 } 3771 3772 static const struct ethtool_ops ibmvnic_ethtool_ops = { 3773 .get_drvinfo = ibmvnic_get_drvinfo, 3774 .get_msglevel = ibmvnic_get_msglevel, 3775 .set_msglevel = ibmvnic_set_msglevel, 3776 .get_link = ibmvnic_get_link, 3777 .get_ringparam = ibmvnic_get_ringparam, 3778 .set_ringparam = ibmvnic_set_ringparam, 3779 .get_channels = ibmvnic_get_channels, 3780 .set_channels = ibmvnic_set_channels, 3781 .get_strings = ibmvnic_get_strings, 3782 .get_sset_count = ibmvnic_get_sset_count, 3783 .get_ethtool_stats = ibmvnic_get_ethtool_stats, 3784 .get_link_ksettings = ibmvnic_get_link_ksettings, 3785 }; 3786 3787 /* Routines for managing CRQs/sCRQs */ 3788 3789 static int reset_one_sub_crq_queue(struct ibmvnic_adapter *adapter, 3790 struct ibmvnic_sub_crq_queue *scrq) 3791 { 3792 int rc; 3793 3794 if (!scrq) { 3795 netdev_dbg(adapter->netdev, "Invalid scrq reset.\n"); 3796 return -EINVAL; 3797 } 3798 3799 if (scrq->irq) { 3800 free_irq(scrq->irq, scrq); 3801 irq_dispose_mapping(scrq->irq); 3802 scrq->irq = 0; 3803 } 3804 3805 if (scrq->msgs) { 3806 memset(scrq->msgs, 0, 4 * PAGE_SIZE); 3807 atomic_set(&scrq->used, 0); 3808 scrq->cur = 0; 3809 scrq->ind_buf.index = 0; 3810 } else { 3811 netdev_dbg(adapter->netdev, "Invalid scrq reset\n"); 3812 return -EINVAL; 3813 } 3814 3815 rc = h_reg_sub_crq(adapter->vdev->unit_address, scrq->msg_token, 3816 4 * PAGE_SIZE, &scrq->crq_num, &scrq->hw_irq); 3817 return rc; 3818 } 3819 3820 static int reset_sub_crq_queues(struct ibmvnic_adapter *adapter) 3821 { 3822 int i, rc; 3823 3824 if (!adapter->tx_scrq || !adapter->rx_scrq) 3825 return -EINVAL; 3826 3827 ibmvnic_clean_affinity(adapter); 3828 3829 for (i = 0; i < adapter->req_tx_queues; i++) { 3830 netdev_dbg(adapter->netdev, "Re-setting tx_scrq[%d]\n", i); 3831 rc = reset_one_sub_crq_queue(adapter, adapter->tx_scrq[i]); 3832 if (rc) 3833 return rc; 3834 } 3835 3836 for (i = 0; i < adapter->req_rx_queues; i++) { 3837 netdev_dbg(adapter->netdev, "Re-setting rx_scrq[%d]\n", i); 3838 rc = reset_one_sub_crq_queue(adapter, adapter->rx_scrq[i]); 3839 if (rc) 3840 return rc; 3841 } 3842 3843 return rc; 3844 } 3845 3846 static void release_sub_crq_queue(struct ibmvnic_adapter *adapter, 3847 struct ibmvnic_sub_crq_queue *scrq, 3848 bool do_h_free) 3849 { 3850 struct device *dev = &adapter->vdev->dev; 3851 long rc; 3852 3853 netdev_dbg(adapter->netdev, "Releasing sub-CRQ\n"); 3854 3855 if (do_h_free) { 3856 /* Close the sub-crqs */ 3857 do { 3858 rc = plpar_hcall_norets(H_FREE_SUB_CRQ, 3859 adapter->vdev->unit_address, 3860 scrq->crq_num); 3861 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); 3862 3863 if (rc) { 3864 netdev_err(adapter->netdev, 3865 "Failed to release sub-CRQ %16lx, rc = %ld\n", 3866 scrq->crq_num, rc); 3867 } 3868 } 3869 3870 dma_free_coherent(dev, 3871 IBMVNIC_IND_ARR_SZ, 3872 scrq->ind_buf.indir_arr, 3873 scrq->ind_buf.indir_dma); 3874 3875 dma_unmap_single(dev, scrq->msg_token, 4 * PAGE_SIZE, 3876 DMA_BIDIRECTIONAL); 3877 free_pages((unsigned long)scrq->msgs, 2); 3878 free_cpumask_var(scrq->affinity_mask); 3879 kfree(scrq); 3880 } 3881 3882 static struct ibmvnic_sub_crq_queue *init_sub_crq_queue(struct ibmvnic_adapter 3883 *adapter) 3884 { 3885 struct device *dev = &adapter->vdev->dev; 3886 struct ibmvnic_sub_crq_queue *scrq; 3887 int rc; 3888 3889 scrq = kzalloc(sizeof(*scrq), GFP_KERNEL); 3890 if (!scrq) 3891 return NULL; 3892 3893 scrq->msgs = 3894 (union sub_crq *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 2); 3895 if (!scrq->msgs) { 3896 dev_warn(dev, "Couldn't allocate crq queue messages page\n"); 3897 goto zero_page_failed; 3898 } 3899 if (!zalloc_cpumask_var(&scrq->affinity_mask, GFP_KERNEL)) 3900 goto cpumask_alloc_failed; 3901 3902 scrq->msg_token = dma_map_single(dev, scrq->msgs, 4 * PAGE_SIZE, 3903 DMA_BIDIRECTIONAL); 3904 if (dma_mapping_error(dev, scrq->msg_token)) { 3905 dev_warn(dev, "Couldn't map crq queue messages page\n"); 3906 goto map_failed; 3907 } 3908 3909 rc = h_reg_sub_crq(adapter->vdev->unit_address, scrq->msg_token, 3910 4 * PAGE_SIZE, &scrq->crq_num, &scrq->hw_irq); 3911 3912 if (rc == H_RESOURCE) 3913 rc = ibmvnic_reset_crq(adapter); 3914 3915 if (rc == H_CLOSED) { 3916 dev_warn(dev, "Partner adapter not ready, waiting.\n"); 3917 } else if (rc) { 3918 dev_warn(dev, "Error %d registering sub-crq\n", rc); 3919 goto reg_failed; 3920 } 3921 3922 scrq->adapter = adapter; 3923 scrq->size = 4 * PAGE_SIZE / sizeof(*scrq->msgs); 3924 scrq->ind_buf.index = 0; 3925 3926 scrq->ind_buf.indir_arr = 3927 dma_alloc_coherent(dev, 3928 IBMVNIC_IND_ARR_SZ, 3929 &scrq->ind_buf.indir_dma, 3930 GFP_KERNEL); 3931 3932 if (!scrq->ind_buf.indir_arr) 3933 goto indir_failed; 3934 3935 spin_lock_init(&scrq->lock); 3936 3937 netdev_dbg(adapter->netdev, 3938 "sub-crq initialized, num %lx, hw_irq=%lx, irq=%x\n", 3939 scrq->crq_num, scrq->hw_irq, scrq->irq); 3940 3941 return scrq; 3942 3943 indir_failed: 3944 do { 3945 rc = plpar_hcall_norets(H_FREE_SUB_CRQ, 3946 adapter->vdev->unit_address, 3947 scrq->crq_num); 3948 } while (rc == H_BUSY || rc == H_IS_LONG_BUSY(rc)); 3949 reg_failed: 3950 dma_unmap_single(dev, scrq->msg_token, 4 * PAGE_SIZE, 3951 DMA_BIDIRECTIONAL); 3952 map_failed: 3953 free_cpumask_var(scrq->affinity_mask); 3954 cpumask_alloc_failed: 3955 free_pages((unsigned long)scrq->msgs, 2); 3956 zero_page_failed: 3957 kfree(scrq); 3958 3959 return NULL; 3960 } 3961 3962 static void release_sub_crqs(struct ibmvnic_adapter *adapter, bool do_h_free) 3963 { 3964 int i; 3965 3966 ibmvnic_clean_affinity(adapter); 3967 if (adapter->tx_scrq) { 3968 for (i = 0; i < adapter->num_active_tx_scrqs; i++) { 3969 if (!adapter->tx_scrq[i]) 3970 continue; 3971 3972 netdev_dbg(adapter->netdev, "Releasing tx_scrq[%d]\n", 3973 i); 3974 ibmvnic_tx_scrq_clean_buffer(adapter, adapter->tx_scrq[i]); 3975 if (adapter->tx_scrq[i]->irq) { 3976 free_irq(adapter->tx_scrq[i]->irq, 3977 adapter->tx_scrq[i]); 3978 irq_dispose_mapping(adapter->tx_scrq[i]->irq); 3979 adapter->tx_scrq[i]->irq = 0; 3980 } 3981 3982 release_sub_crq_queue(adapter, adapter->tx_scrq[i], 3983 do_h_free); 3984 } 3985 3986 kfree(adapter->tx_scrq); 3987 adapter->tx_scrq = NULL; 3988 adapter->num_active_tx_scrqs = 0; 3989 } 3990 3991 if (adapter->rx_scrq) { 3992 for (i = 0; i < adapter->num_active_rx_scrqs; i++) { 3993 if (!adapter->rx_scrq[i]) 3994 continue; 3995 3996 netdev_dbg(adapter->netdev, "Releasing rx_scrq[%d]\n", 3997 i); 3998 if (adapter->rx_scrq[i]->irq) { 3999 free_irq(adapter->rx_scrq[i]->irq, 4000 adapter->rx_scrq[i]); 4001 irq_dispose_mapping(adapter->rx_scrq[i]->irq); 4002 adapter->rx_scrq[i]->irq = 0; 4003 } 4004 4005 release_sub_crq_queue(adapter, adapter->rx_scrq[i], 4006 do_h_free); 4007 } 4008 4009 kfree(adapter->rx_scrq); 4010 adapter->rx_scrq = NULL; 4011 adapter->num_active_rx_scrqs = 0; 4012 } 4013 } 4014 4015 static int disable_scrq_irq(struct ibmvnic_adapter *adapter, 4016 struct ibmvnic_sub_crq_queue *scrq) 4017 { 4018 struct device *dev = &adapter->vdev->dev; 4019 unsigned long rc; 4020 4021 rc = plpar_hcall_norets(H_VIOCTL, adapter->vdev->unit_address, 4022 H_DISABLE_VIO_INTERRUPT, scrq->hw_irq, 0, 0); 4023 if (rc) 4024 dev_err(dev, "Couldn't disable scrq irq 0x%lx. rc=%ld\n", 4025 scrq->hw_irq, rc); 4026 return rc; 4027 } 4028 4029 /* We can not use the IRQ chip EOI handler because that has the 4030 * unintended effect of changing the interrupt priority. 4031 */ 4032 static void ibmvnic_xics_eoi(struct device *dev, struct ibmvnic_sub_crq_queue *scrq) 4033 { 4034 u64 val = 0xff000000 | scrq->hw_irq; 4035 unsigned long rc; 4036 4037 rc = plpar_hcall_norets(H_EOI, val); 4038 if (rc) 4039 dev_err(dev, "H_EOI FAILED irq 0x%llx. rc=%ld\n", val, rc); 4040 } 4041 4042 /* Due to a firmware bug, the hypervisor can send an interrupt to a 4043 * transmit or receive queue just prior to a partition migration. 4044 * Force an EOI after migration. 4045 */ 4046 static void ibmvnic_clear_pending_interrupt(struct device *dev, 4047 struct ibmvnic_sub_crq_queue *scrq) 4048 { 4049 if (!xive_enabled()) 4050 ibmvnic_xics_eoi(dev, scrq); 4051 } 4052 4053 static int enable_scrq_irq(struct ibmvnic_adapter *adapter, 4054 struct ibmvnic_sub_crq_queue *scrq) 4055 { 4056 struct device *dev = &adapter->vdev->dev; 4057 unsigned long rc; 4058 4059 if (scrq->hw_irq > 0x100000000ULL) { 4060 dev_err(dev, "bad hw_irq = %lx\n", scrq->hw_irq); 4061 return 1; 4062 } 4063 4064 if (test_bit(0, &adapter->resetting) && 4065 adapter->reset_reason == VNIC_RESET_MOBILITY) { 4066 ibmvnic_clear_pending_interrupt(dev, scrq); 4067 } 4068 4069 rc = plpar_hcall_norets(H_VIOCTL, adapter->vdev->unit_address, 4070 H_ENABLE_VIO_INTERRUPT, scrq->hw_irq, 0, 0); 4071 if (rc) 4072 dev_err(dev, "Couldn't enable scrq irq 0x%lx. rc=%ld\n", 4073 scrq->hw_irq, rc); 4074 return rc; 4075 } 4076 4077 static int ibmvnic_complete_tx(struct ibmvnic_adapter *adapter, 4078 struct ibmvnic_sub_crq_queue *scrq) 4079 { 4080 struct device *dev = &adapter->vdev->dev; 4081 struct ibmvnic_tx_pool *tx_pool; 4082 struct ibmvnic_tx_buff *txbuff; 4083 struct netdev_queue *txq; 4084 union sub_crq *next; 4085 int index; 4086 int i; 4087 4088 restart_loop: 4089 while (pending_scrq(adapter, scrq)) { 4090 unsigned int pool = scrq->pool_index; 4091 int num_entries = 0; 4092 int total_bytes = 0; 4093 int num_packets = 0; 4094 4095 next = ibmvnic_next_scrq(adapter, scrq); 4096 for (i = 0; i < next->tx_comp.num_comps; i++) { 4097 index = be32_to_cpu(next->tx_comp.correlators[i]); 4098 if (index & IBMVNIC_TSO_POOL_MASK) { 4099 tx_pool = &adapter->tso_pool[pool]; 4100 index &= ~IBMVNIC_TSO_POOL_MASK; 4101 } else { 4102 tx_pool = &adapter->tx_pool[pool]; 4103 } 4104 4105 txbuff = &tx_pool->tx_buff[index]; 4106 num_packets++; 4107 num_entries += txbuff->num_entries; 4108 if (txbuff->skb) { 4109 total_bytes += txbuff->skb->len; 4110 if (next->tx_comp.rcs[i]) { 4111 dev_err(dev, "tx error %x\n", 4112 next->tx_comp.rcs[i]); 4113 dev_kfree_skb_irq(txbuff->skb); 4114 } else { 4115 dev_consume_skb_irq(txbuff->skb); 4116 } 4117 txbuff->skb = NULL; 4118 } else { 4119 netdev_warn(adapter->netdev, 4120 "TX completion received with NULL socket buffer\n"); 4121 } 4122 tx_pool->free_map[tx_pool->producer_index] = index; 4123 tx_pool->producer_index = 4124 (tx_pool->producer_index + 1) % 4125 tx_pool->num_buffers; 4126 } 4127 /* remove tx_comp scrq*/ 4128 next->tx_comp.first = 0; 4129 4130 txq = netdev_get_tx_queue(adapter->netdev, scrq->pool_index); 4131 netdev_tx_completed_queue(txq, num_packets, total_bytes); 4132 4133 if (atomic_sub_return(num_entries, &scrq->used) <= 4134 (adapter->req_tx_entries_per_subcrq / 2) && 4135 __netif_subqueue_stopped(adapter->netdev, 4136 scrq->pool_index)) { 4137 rcu_read_lock(); 4138 if (adapter->tx_queues_active) { 4139 netif_wake_subqueue(adapter->netdev, 4140 scrq->pool_index); 4141 netdev_dbg(adapter->netdev, 4142 "Started queue %d\n", 4143 scrq->pool_index); 4144 } 4145 rcu_read_unlock(); 4146 } 4147 } 4148 4149 enable_scrq_irq(adapter, scrq); 4150 4151 if (pending_scrq(adapter, scrq)) { 4152 disable_scrq_irq(adapter, scrq); 4153 goto restart_loop; 4154 } 4155 4156 return 0; 4157 } 4158 4159 static irqreturn_t ibmvnic_interrupt_tx(int irq, void *instance) 4160 { 4161 struct ibmvnic_sub_crq_queue *scrq = instance; 4162 struct ibmvnic_adapter *adapter = scrq->adapter; 4163 4164 disable_scrq_irq(adapter, scrq); 4165 ibmvnic_complete_tx(adapter, scrq); 4166 4167 return IRQ_HANDLED; 4168 } 4169 4170 static irqreturn_t ibmvnic_interrupt_rx(int irq, void *instance) 4171 { 4172 struct ibmvnic_sub_crq_queue *scrq = instance; 4173 struct ibmvnic_adapter *adapter = scrq->adapter; 4174 4175 /* When booting a kdump kernel we can hit pending interrupts 4176 * prior to completing driver initialization. 4177 */ 4178 if (unlikely(adapter->state != VNIC_OPEN)) 4179 return IRQ_NONE; 4180 4181 adapter->rx_stats_buffers[scrq->scrq_num].interrupts++; 4182 4183 if (napi_schedule_prep(&adapter->napi[scrq->scrq_num])) { 4184 disable_scrq_irq(adapter, scrq); 4185 __napi_schedule(&adapter->napi[scrq->scrq_num]); 4186 } 4187 4188 return IRQ_HANDLED; 4189 } 4190 4191 static int init_sub_crq_irqs(struct ibmvnic_adapter *adapter) 4192 { 4193 struct device *dev = &adapter->vdev->dev; 4194 struct ibmvnic_sub_crq_queue *scrq; 4195 int i = 0, j = 0; 4196 int rc = 0; 4197 4198 for (i = 0; i < adapter->req_tx_queues; i++) { 4199 netdev_dbg(adapter->netdev, "Initializing tx_scrq[%d] irq\n", 4200 i); 4201 scrq = adapter->tx_scrq[i]; 4202 scrq->irq = irq_create_mapping(NULL, scrq->hw_irq); 4203 4204 if (!scrq->irq) { 4205 rc = -EINVAL; 4206 dev_err(dev, "Error mapping irq\n"); 4207 goto req_tx_irq_failed; 4208 } 4209 4210 snprintf(scrq->name, sizeof(scrq->name), "ibmvnic-%x-tx%d", 4211 adapter->vdev->unit_address, i); 4212 rc = request_irq(scrq->irq, ibmvnic_interrupt_tx, 4213 0, scrq->name, scrq); 4214 4215 if (rc) { 4216 dev_err(dev, "Couldn't register tx irq 0x%x. rc=%d\n", 4217 scrq->irq, rc); 4218 irq_dispose_mapping(scrq->irq); 4219 goto req_tx_irq_failed; 4220 } 4221 } 4222 4223 for (i = 0; i < adapter->req_rx_queues; i++) { 4224 netdev_dbg(adapter->netdev, "Initializing rx_scrq[%d] irq\n", 4225 i); 4226 scrq = adapter->rx_scrq[i]; 4227 scrq->irq = irq_create_mapping(NULL, scrq->hw_irq); 4228 if (!scrq->irq) { 4229 rc = -EINVAL; 4230 dev_err(dev, "Error mapping irq\n"); 4231 goto req_rx_irq_failed; 4232 } 4233 snprintf(scrq->name, sizeof(scrq->name), "ibmvnic-%x-rx%d", 4234 adapter->vdev->unit_address, i); 4235 rc = request_irq(scrq->irq, ibmvnic_interrupt_rx, 4236 0, scrq->name, scrq); 4237 if (rc) { 4238 dev_err(dev, "Couldn't register rx irq 0x%x. rc=%d\n", 4239 scrq->irq, rc); 4240 irq_dispose_mapping(scrq->irq); 4241 goto req_rx_irq_failed; 4242 } 4243 } 4244 4245 cpus_read_lock(); 4246 ibmvnic_set_affinity(adapter); 4247 cpus_read_unlock(); 4248 4249 return rc; 4250 4251 req_rx_irq_failed: 4252 for (j = 0; j < i; j++) { 4253 free_irq(adapter->rx_scrq[j]->irq, adapter->rx_scrq[j]); 4254 irq_dispose_mapping(adapter->rx_scrq[j]->irq); 4255 } 4256 i = adapter->req_tx_queues; 4257 req_tx_irq_failed: 4258 for (j = 0; j < i; j++) { 4259 free_irq(adapter->tx_scrq[j]->irq, adapter->tx_scrq[j]); 4260 irq_dispose_mapping(adapter->tx_scrq[j]->irq); 4261 } 4262 release_sub_crqs(adapter, 1); 4263 return rc; 4264 } 4265 4266 static int init_sub_crqs(struct ibmvnic_adapter *adapter) 4267 { 4268 struct device *dev = &adapter->vdev->dev; 4269 struct ibmvnic_sub_crq_queue **allqueues; 4270 int registered_queues = 0; 4271 int total_queues; 4272 int more = 0; 4273 int i; 4274 4275 total_queues = adapter->req_tx_queues + adapter->req_rx_queues; 4276 4277 allqueues = kcalloc(total_queues, sizeof(*allqueues), GFP_KERNEL); 4278 if (!allqueues) 4279 return -ENOMEM; 4280 4281 for (i = 0; i < total_queues; i++) { 4282 allqueues[i] = init_sub_crq_queue(adapter); 4283 if (!allqueues[i]) { 4284 dev_warn(dev, "Couldn't allocate all sub-crqs\n"); 4285 break; 4286 } 4287 registered_queues++; 4288 } 4289 4290 /* Make sure we were able to register the minimum number of queues */ 4291 if (registered_queues < 4292 adapter->min_tx_queues + adapter->min_rx_queues) { 4293 dev_err(dev, "Fatal: Couldn't init min number of sub-crqs\n"); 4294 goto tx_failed; 4295 } 4296 4297 /* Distribute the failed allocated queues*/ 4298 for (i = 0; i < total_queues - registered_queues + more ; i++) { 4299 netdev_dbg(adapter->netdev, "Reducing number of queues\n"); 4300 switch (i % 3) { 4301 case 0: 4302 if (adapter->req_rx_queues > adapter->min_rx_queues) 4303 adapter->req_rx_queues--; 4304 else 4305 more++; 4306 break; 4307 case 1: 4308 if (adapter->req_tx_queues > adapter->min_tx_queues) 4309 adapter->req_tx_queues--; 4310 else 4311 more++; 4312 break; 4313 } 4314 } 4315 4316 adapter->tx_scrq = kcalloc(adapter->req_tx_queues, 4317 sizeof(*adapter->tx_scrq), GFP_KERNEL); 4318 if (!adapter->tx_scrq) 4319 goto tx_failed; 4320 4321 for (i = 0; i < adapter->req_tx_queues; i++) { 4322 adapter->tx_scrq[i] = allqueues[i]; 4323 adapter->tx_scrq[i]->pool_index = i; 4324 adapter->num_active_tx_scrqs++; 4325 } 4326 4327 adapter->rx_scrq = kcalloc(adapter->req_rx_queues, 4328 sizeof(*adapter->rx_scrq), GFP_KERNEL); 4329 if (!adapter->rx_scrq) 4330 goto rx_failed; 4331 4332 for (i = 0; i < adapter->req_rx_queues; i++) { 4333 adapter->rx_scrq[i] = allqueues[i + adapter->req_tx_queues]; 4334 adapter->rx_scrq[i]->scrq_num = i; 4335 adapter->num_active_rx_scrqs++; 4336 } 4337 4338 kfree(allqueues); 4339 return 0; 4340 4341 rx_failed: 4342 kfree(adapter->tx_scrq); 4343 adapter->tx_scrq = NULL; 4344 tx_failed: 4345 for (i = 0; i < registered_queues; i++) 4346 release_sub_crq_queue(adapter, allqueues[i], 1); 4347 kfree(allqueues); 4348 return -ENOMEM; 4349 } 4350 4351 static void send_request_cap(struct ibmvnic_adapter *adapter, int retry) 4352 { 4353 struct device *dev = &adapter->vdev->dev; 4354 union ibmvnic_crq crq; 4355 int max_entries; 4356 int cap_reqs; 4357 4358 /* We send out 6 or 7 REQUEST_CAPABILITY CRQs below (depending on 4359 * the PROMISC flag). Initialize this count upfront. When the tasklet 4360 * receives a response to all of these, it will send the next protocol 4361 * message (QUERY_IP_OFFLOAD). 4362 */ 4363 if (!(adapter->netdev->flags & IFF_PROMISC) || 4364 adapter->promisc_supported) 4365 cap_reqs = 7; 4366 else 4367 cap_reqs = 6; 4368 4369 if (!retry) { 4370 /* Sub-CRQ entries are 32 byte long */ 4371 int entries_page = 4 * PAGE_SIZE / (sizeof(u64) * 4); 4372 4373 atomic_set(&adapter->running_cap_crqs, cap_reqs); 4374 4375 if (adapter->min_tx_entries_per_subcrq > entries_page || 4376 adapter->min_rx_add_entries_per_subcrq > entries_page) { 4377 dev_err(dev, "Fatal, invalid entries per sub-crq\n"); 4378 return; 4379 } 4380 4381 if (adapter->desired.mtu) 4382 adapter->req_mtu = adapter->desired.mtu; 4383 else 4384 adapter->req_mtu = adapter->netdev->mtu + ETH_HLEN; 4385 4386 if (!adapter->desired.tx_entries) 4387 adapter->desired.tx_entries = 4388 adapter->max_tx_entries_per_subcrq; 4389 if (!adapter->desired.rx_entries) 4390 adapter->desired.rx_entries = 4391 adapter->max_rx_add_entries_per_subcrq; 4392 4393 max_entries = IBMVNIC_LTB_SET_SIZE / 4394 (adapter->req_mtu + IBMVNIC_BUFFER_HLEN); 4395 4396 if ((adapter->req_mtu + IBMVNIC_BUFFER_HLEN) * 4397 adapter->desired.tx_entries > IBMVNIC_LTB_SET_SIZE) { 4398 adapter->desired.tx_entries = max_entries; 4399 } 4400 4401 if ((adapter->req_mtu + IBMVNIC_BUFFER_HLEN) * 4402 adapter->desired.rx_entries > IBMVNIC_LTB_SET_SIZE) { 4403 adapter->desired.rx_entries = max_entries; 4404 } 4405 4406 if (adapter->desired.tx_entries) 4407 adapter->req_tx_entries_per_subcrq = 4408 adapter->desired.tx_entries; 4409 else 4410 adapter->req_tx_entries_per_subcrq = 4411 adapter->max_tx_entries_per_subcrq; 4412 4413 if (adapter->desired.rx_entries) 4414 adapter->req_rx_add_entries_per_subcrq = 4415 adapter->desired.rx_entries; 4416 else 4417 adapter->req_rx_add_entries_per_subcrq = 4418 adapter->max_rx_add_entries_per_subcrq; 4419 4420 if (adapter->desired.tx_queues) 4421 adapter->req_tx_queues = 4422 adapter->desired.tx_queues; 4423 else 4424 adapter->req_tx_queues = 4425 adapter->opt_tx_comp_sub_queues; 4426 4427 if (adapter->desired.rx_queues) 4428 adapter->req_rx_queues = 4429 adapter->desired.rx_queues; 4430 else 4431 adapter->req_rx_queues = 4432 adapter->opt_rx_comp_queues; 4433 4434 adapter->req_rx_add_queues = adapter->max_rx_add_queues; 4435 } else { 4436 atomic_add(cap_reqs, &adapter->running_cap_crqs); 4437 } 4438 memset(&crq, 0, sizeof(crq)); 4439 crq.request_capability.first = IBMVNIC_CRQ_CMD; 4440 crq.request_capability.cmd = REQUEST_CAPABILITY; 4441 4442 crq.request_capability.capability = cpu_to_be16(REQ_TX_QUEUES); 4443 crq.request_capability.number = cpu_to_be64(adapter->req_tx_queues); 4444 cap_reqs--; 4445 ibmvnic_send_crq(adapter, &crq); 4446 4447 crq.request_capability.capability = cpu_to_be16(REQ_RX_QUEUES); 4448 crq.request_capability.number = cpu_to_be64(adapter->req_rx_queues); 4449 cap_reqs--; 4450 ibmvnic_send_crq(adapter, &crq); 4451 4452 crq.request_capability.capability = cpu_to_be16(REQ_RX_ADD_QUEUES); 4453 crq.request_capability.number = cpu_to_be64(adapter->req_rx_add_queues); 4454 cap_reqs--; 4455 ibmvnic_send_crq(adapter, &crq); 4456 4457 crq.request_capability.capability = 4458 cpu_to_be16(REQ_TX_ENTRIES_PER_SUBCRQ); 4459 crq.request_capability.number = 4460 cpu_to_be64(adapter->req_tx_entries_per_subcrq); 4461 cap_reqs--; 4462 ibmvnic_send_crq(adapter, &crq); 4463 4464 crq.request_capability.capability = 4465 cpu_to_be16(REQ_RX_ADD_ENTRIES_PER_SUBCRQ); 4466 crq.request_capability.number = 4467 cpu_to_be64(adapter->req_rx_add_entries_per_subcrq); 4468 cap_reqs--; 4469 ibmvnic_send_crq(adapter, &crq); 4470 4471 crq.request_capability.capability = cpu_to_be16(REQ_MTU); 4472 crq.request_capability.number = cpu_to_be64(adapter->req_mtu); 4473 cap_reqs--; 4474 ibmvnic_send_crq(adapter, &crq); 4475 4476 if (adapter->netdev->flags & IFF_PROMISC) { 4477 if (adapter->promisc_supported) { 4478 crq.request_capability.capability = 4479 cpu_to_be16(PROMISC_REQUESTED); 4480 crq.request_capability.number = cpu_to_be64(1); 4481 cap_reqs--; 4482 ibmvnic_send_crq(adapter, &crq); 4483 } 4484 } else { 4485 crq.request_capability.capability = 4486 cpu_to_be16(PROMISC_REQUESTED); 4487 crq.request_capability.number = cpu_to_be64(0); 4488 cap_reqs--; 4489 ibmvnic_send_crq(adapter, &crq); 4490 } 4491 4492 /* Keep at end to catch any discrepancy between expected and actual 4493 * CRQs sent. 4494 */ 4495 WARN_ON(cap_reqs != 0); 4496 } 4497 4498 static int pending_scrq(struct ibmvnic_adapter *adapter, 4499 struct ibmvnic_sub_crq_queue *scrq) 4500 { 4501 union sub_crq *entry = &scrq->msgs[scrq->cur]; 4502 int rc; 4503 4504 rc = !!(entry->generic.first & IBMVNIC_CRQ_CMD_RSP); 4505 4506 /* Ensure that the SCRQ valid flag is loaded prior to loading the 4507 * contents of the SCRQ descriptor 4508 */ 4509 dma_rmb(); 4510 4511 return rc; 4512 } 4513 4514 static union sub_crq *ibmvnic_next_scrq(struct ibmvnic_adapter *adapter, 4515 struct ibmvnic_sub_crq_queue *scrq) 4516 { 4517 union sub_crq *entry; 4518 unsigned long flags; 4519 4520 spin_lock_irqsave(&scrq->lock, flags); 4521 entry = &scrq->msgs[scrq->cur]; 4522 if (entry->generic.first & IBMVNIC_CRQ_CMD_RSP) { 4523 if (++scrq->cur == scrq->size) 4524 scrq->cur = 0; 4525 } else { 4526 entry = NULL; 4527 } 4528 spin_unlock_irqrestore(&scrq->lock, flags); 4529 4530 /* Ensure that the SCRQ valid flag is loaded prior to loading the 4531 * contents of the SCRQ descriptor 4532 */ 4533 dma_rmb(); 4534 4535 return entry; 4536 } 4537 4538 static union ibmvnic_crq *ibmvnic_next_crq(struct ibmvnic_adapter *adapter) 4539 { 4540 struct ibmvnic_crq_queue *queue = &adapter->crq; 4541 union ibmvnic_crq *crq; 4542 4543 crq = &queue->msgs[queue->cur]; 4544 if (crq->generic.first & IBMVNIC_CRQ_CMD_RSP) { 4545 if (++queue->cur == queue->size) 4546 queue->cur = 0; 4547 } else { 4548 crq = NULL; 4549 } 4550 4551 return crq; 4552 } 4553 4554 static void print_subcrq_error(struct device *dev, int rc, const char *func) 4555 { 4556 switch (rc) { 4557 case H_PARAMETER: 4558 dev_warn_ratelimited(dev, 4559 "%s failed: Send request is malformed or adapter failover pending. (rc=%d)\n", 4560 func, rc); 4561 break; 4562 case H_CLOSED: 4563 dev_warn_ratelimited(dev, 4564 "%s failed: Backing queue closed. Adapter is down or failover pending. (rc=%d)\n", 4565 func, rc); 4566 break; 4567 default: 4568 dev_err_ratelimited(dev, "%s failed: (rc=%d)\n", func, rc); 4569 break; 4570 } 4571 } 4572 4573 static int send_subcrq_indirect(struct ibmvnic_adapter *adapter, 4574 u64 remote_handle, u64 ioba, u64 num_entries) 4575 { 4576 unsigned int ua = adapter->vdev->unit_address; 4577 struct device *dev = &adapter->vdev->dev; 4578 int rc; 4579 4580 /* Make sure the hypervisor sees the complete request */ 4581 dma_wmb(); 4582 rc = plpar_hcall_norets(H_SEND_SUB_CRQ_INDIRECT, ua, 4583 cpu_to_be64(remote_handle), 4584 ioba, num_entries); 4585 4586 if (rc) 4587 print_subcrq_error(dev, rc, __func__); 4588 4589 return rc; 4590 } 4591 4592 static int ibmvnic_send_crq(struct ibmvnic_adapter *adapter, 4593 union ibmvnic_crq *crq) 4594 { 4595 unsigned int ua = adapter->vdev->unit_address; 4596 struct device *dev = &adapter->vdev->dev; 4597 u64 *u64_crq = (u64 *)crq; 4598 int rc; 4599 4600 netdev_dbg(adapter->netdev, "Sending CRQ: %016lx %016lx\n", 4601 (unsigned long)cpu_to_be64(u64_crq[0]), 4602 (unsigned long)cpu_to_be64(u64_crq[1])); 4603 4604 if (!adapter->crq.active && 4605 crq->generic.first != IBMVNIC_CRQ_INIT_CMD) { 4606 dev_warn(dev, "Invalid request detected while CRQ is inactive, possible device state change during reset\n"); 4607 return -EINVAL; 4608 } 4609 4610 /* Make sure the hypervisor sees the complete request */ 4611 dma_wmb(); 4612 4613 rc = plpar_hcall_norets(H_SEND_CRQ, ua, 4614 cpu_to_be64(u64_crq[0]), 4615 cpu_to_be64(u64_crq[1])); 4616 4617 if (rc) { 4618 if (rc == H_CLOSED) { 4619 dev_warn(dev, "CRQ Queue closed\n"); 4620 /* do not reset, report the fail, wait for passive init from server */ 4621 } 4622 4623 dev_warn(dev, "Send error (rc=%d)\n", rc); 4624 } 4625 4626 return rc; 4627 } 4628 4629 static int ibmvnic_send_crq_init(struct ibmvnic_adapter *adapter) 4630 { 4631 struct device *dev = &adapter->vdev->dev; 4632 union ibmvnic_crq crq; 4633 int retries = 100; 4634 int rc; 4635 4636 memset(&crq, 0, sizeof(crq)); 4637 crq.generic.first = IBMVNIC_CRQ_INIT_CMD; 4638 crq.generic.cmd = IBMVNIC_CRQ_INIT; 4639 netdev_dbg(adapter->netdev, "Sending CRQ init\n"); 4640 4641 do { 4642 rc = ibmvnic_send_crq(adapter, &crq); 4643 if (rc != H_CLOSED) 4644 break; 4645 retries--; 4646 msleep(50); 4647 4648 } while (retries > 0); 4649 4650 if (rc) { 4651 dev_err(dev, "Failed to send init request, rc = %d\n", rc); 4652 return rc; 4653 } 4654 4655 return 0; 4656 } 4657 4658 struct vnic_login_client_data { 4659 u8 type; 4660 __be16 len; 4661 char name[]; 4662 } __packed; 4663 4664 static int vnic_client_data_len(struct ibmvnic_adapter *adapter) 4665 { 4666 int len; 4667 4668 /* Calculate the amount of buffer space needed for the 4669 * vnic client data in the login buffer. There are four entries, 4670 * OS name, LPAR name, device name, and a null last entry. 4671 */ 4672 len = 4 * sizeof(struct vnic_login_client_data); 4673 len += 6; /* "Linux" plus NULL */ 4674 len += strlen(utsname()->nodename) + 1; 4675 len += strlen(adapter->netdev->name) + 1; 4676 4677 return len; 4678 } 4679 4680 static void vnic_add_client_data(struct ibmvnic_adapter *adapter, 4681 struct vnic_login_client_data *vlcd) 4682 { 4683 const char *os_name = "Linux"; 4684 int len; 4685 4686 /* Type 1 - LPAR OS */ 4687 vlcd->type = 1; 4688 len = strlen(os_name) + 1; 4689 vlcd->len = cpu_to_be16(len); 4690 strscpy(vlcd->name, os_name, len); 4691 vlcd = (struct vnic_login_client_data *)(vlcd->name + len); 4692 4693 /* Type 2 - LPAR name */ 4694 vlcd->type = 2; 4695 len = strlen(utsname()->nodename) + 1; 4696 vlcd->len = cpu_to_be16(len); 4697 strscpy(vlcd->name, utsname()->nodename, len); 4698 vlcd = (struct vnic_login_client_data *)(vlcd->name + len); 4699 4700 /* Type 3 - device name */ 4701 vlcd->type = 3; 4702 len = strlen(adapter->netdev->name) + 1; 4703 vlcd->len = cpu_to_be16(len); 4704 strscpy(vlcd->name, adapter->netdev->name, len); 4705 } 4706 4707 static int send_login(struct ibmvnic_adapter *adapter) 4708 { 4709 struct ibmvnic_login_rsp_buffer *login_rsp_buffer; 4710 struct ibmvnic_login_buffer *login_buffer; 4711 struct device *dev = &adapter->vdev->dev; 4712 struct vnic_login_client_data *vlcd; 4713 dma_addr_t rsp_buffer_token; 4714 dma_addr_t buffer_token; 4715 size_t rsp_buffer_size; 4716 union ibmvnic_crq crq; 4717 int client_data_len; 4718 size_t buffer_size; 4719 __be64 *tx_list_p; 4720 __be64 *rx_list_p; 4721 int rc; 4722 int i; 4723 4724 if (!adapter->tx_scrq || !adapter->rx_scrq) { 4725 netdev_err(adapter->netdev, 4726 "RX or TX queues are not allocated, device login failed\n"); 4727 return -ENOMEM; 4728 } 4729 4730 release_login_buffer(adapter); 4731 release_login_rsp_buffer(adapter); 4732 4733 client_data_len = vnic_client_data_len(adapter); 4734 4735 buffer_size = 4736 sizeof(struct ibmvnic_login_buffer) + 4737 sizeof(u64) * (adapter->req_tx_queues + adapter->req_rx_queues) + 4738 client_data_len; 4739 4740 login_buffer = kzalloc(buffer_size, GFP_ATOMIC); 4741 if (!login_buffer) 4742 goto buf_alloc_failed; 4743 4744 buffer_token = dma_map_single(dev, login_buffer, buffer_size, 4745 DMA_TO_DEVICE); 4746 if (dma_mapping_error(dev, buffer_token)) { 4747 dev_err(dev, "Couldn't map login buffer\n"); 4748 goto buf_map_failed; 4749 } 4750 4751 rsp_buffer_size = sizeof(struct ibmvnic_login_rsp_buffer) + 4752 sizeof(u64) * adapter->req_tx_queues + 4753 sizeof(u64) * adapter->req_rx_queues + 4754 sizeof(u64) * adapter->req_rx_queues + 4755 sizeof(u8) * IBMVNIC_TX_DESC_VERSIONS; 4756 4757 login_rsp_buffer = kmalloc(rsp_buffer_size, GFP_ATOMIC); 4758 if (!login_rsp_buffer) 4759 goto buf_rsp_alloc_failed; 4760 4761 rsp_buffer_token = dma_map_single(dev, login_rsp_buffer, 4762 rsp_buffer_size, DMA_FROM_DEVICE); 4763 if (dma_mapping_error(dev, rsp_buffer_token)) { 4764 dev_err(dev, "Couldn't map login rsp buffer\n"); 4765 goto buf_rsp_map_failed; 4766 } 4767 4768 adapter->login_buf = login_buffer; 4769 adapter->login_buf_token = buffer_token; 4770 adapter->login_buf_sz = buffer_size; 4771 adapter->login_rsp_buf = login_rsp_buffer; 4772 adapter->login_rsp_buf_token = rsp_buffer_token; 4773 adapter->login_rsp_buf_sz = rsp_buffer_size; 4774 4775 login_buffer->len = cpu_to_be32(buffer_size); 4776 login_buffer->version = cpu_to_be32(INITIAL_VERSION_LB); 4777 login_buffer->num_txcomp_subcrqs = cpu_to_be32(adapter->req_tx_queues); 4778 login_buffer->off_txcomp_subcrqs = 4779 cpu_to_be32(sizeof(struct ibmvnic_login_buffer)); 4780 login_buffer->num_rxcomp_subcrqs = cpu_to_be32(adapter->req_rx_queues); 4781 login_buffer->off_rxcomp_subcrqs = 4782 cpu_to_be32(sizeof(struct ibmvnic_login_buffer) + 4783 sizeof(u64) * adapter->req_tx_queues); 4784 login_buffer->login_rsp_ioba = cpu_to_be32(rsp_buffer_token); 4785 login_buffer->login_rsp_len = cpu_to_be32(rsp_buffer_size); 4786 4787 tx_list_p = (__be64 *)((char *)login_buffer + 4788 sizeof(struct ibmvnic_login_buffer)); 4789 rx_list_p = (__be64 *)((char *)login_buffer + 4790 sizeof(struct ibmvnic_login_buffer) + 4791 sizeof(u64) * adapter->req_tx_queues); 4792 4793 for (i = 0; i < adapter->req_tx_queues; i++) { 4794 if (adapter->tx_scrq[i]) { 4795 tx_list_p[i] = 4796 cpu_to_be64(adapter->tx_scrq[i]->crq_num); 4797 } 4798 } 4799 4800 for (i = 0; i < adapter->req_rx_queues; i++) { 4801 if (adapter->rx_scrq[i]) { 4802 rx_list_p[i] = 4803 cpu_to_be64(adapter->rx_scrq[i]->crq_num); 4804 } 4805 } 4806 4807 /* Insert vNIC login client data */ 4808 vlcd = (struct vnic_login_client_data *) 4809 ((char *)rx_list_p + (sizeof(u64) * adapter->req_rx_queues)); 4810 login_buffer->client_data_offset = 4811 cpu_to_be32((char *)vlcd - (char *)login_buffer); 4812 login_buffer->client_data_len = cpu_to_be32(client_data_len); 4813 4814 vnic_add_client_data(adapter, vlcd); 4815 4816 netdev_dbg(adapter->netdev, "Login Buffer:\n"); 4817 for (i = 0; i < (adapter->login_buf_sz - 1) / 8 + 1; i++) { 4818 netdev_dbg(adapter->netdev, "%016lx\n", 4819 ((unsigned long *)(adapter->login_buf))[i]); 4820 } 4821 4822 memset(&crq, 0, sizeof(crq)); 4823 crq.login.first = IBMVNIC_CRQ_CMD; 4824 crq.login.cmd = LOGIN; 4825 crq.login.ioba = cpu_to_be32(buffer_token); 4826 crq.login.len = cpu_to_be32(buffer_size); 4827 4828 adapter->login_pending = true; 4829 rc = ibmvnic_send_crq(adapter, &crq); 4830 if (rc) { 4831 adapter->login_pending = false; 4832 netdev_err(adapter->netdev, "Failed to send login, rc=%d\n", rc); 4833 goto buf_rsp_map_failed; 4834 } 4835 4836 return 0; 4837 4838 buf_rsp_map_failed: 4839 kfree(login_rsp_buffer); 4840 adapter->login_rsp_buf = NULL; 4841 buf_rsp_alloc_failed: 4842 dma_unmap_single(dev, buffer_token, buffer_size, DMA_TO_DEVICE); 4843 buf_map_failed: 4844 kfree(login_buffer); 4845 adapter->login_buf = NULL; 4846 buf_alloc_failed: 4847 return -ENOMEM; 4848 } 4849 4850 static int send_request_map(struct ibmvnic_adapter *adapter, dma_addr_t addr, 4851 u32 len, u8 map_id) 4852 { 4853 union ibmvnic_crq crq; 4854 4855 memset(&crq, 0, sizeof(crq)); 4856 crq.request_map.first = IBMVNIC_CRQ_CMD; 4857 crq.request_map.cmd = REQUEST_MAP; 4858 crq.request_map.map_id = map_id; 4859 crq.request_map.ioba = cpu_to_be32(addr); 4860 crq.request_map.len = cpu_to_be32(len); 4861 return ibmvnic_send_crq(adapter, &crq); 4862 } 4863 4864 static int send_request_unmap(struct ibmvnic_adapter *adapter, u8 map_id) 4865 { 4866 union ibmvnic_crq crq; 4867 4868 memset(&crq, 0, sizeof(crq)); 4869 crq.request_unmap.first = IBMVNIC_CRQ_CMD; 4870 crq.request_unmap.cmd = REQUEST_UNMAP; 4871 crq.request_unmap.map_id = map_id; 4872 return ibmvnic_send_crq(adapter, &crq); 4873 } 4874 4875 static void send_query_map(struct ibmvnic_adapter *adapter) 4876 { 4877 union ibmvnic_crq crq; 4878 4879 memset(&crq, 0, sizeof(crq)); 4880 crq.query_map.first = IBMVNIC_CRQ_CMD; 4881 crq.query_map.cmd = QUERY_MAP; 4882 ibmvnic_send_crq(adapter, &crq); 4883 } 4884 4885 /* Send a series of CRQs requesting various capabilities of the VNIC server */ 4886 static void send_query_cap(struct ibmvnic_adapter *adapter) 4887 { 4888 union ibmvnic_crq crq; 4889 int cap_reqs; 4890 4891 /* We send out 25 QUERY_CAPABILITY CRQs below. Initialize this count 4892 * upfront. When the tasklet receives a response to all of these, it 4893 * can send out the next protocol messaage (REQUEST_CAPABILITY). 4894 */ 4895 cap_reqs = 25; 4896 4897 atomic_set(&adapter->running_cap_crqs, cap_reqs); 4898 4899 memset(&crq, 0, sizeof(crq)); 4900 crq.query_capability.first = IBMVNIC_CRQ_CMD; 4901 crq.query_capability.cmd = QUERY_CAPABILITY; 4902 4903 crq.query_capability.capability = cpu_to_be16(MIN_TX_QUEUES); 4904 ibmvnic_send_crq(adapter, &crq); 4905 cap_reqs--; 4906 4907 crq.query_capability.capability = cpu_to_be16(MIN_RX_QUEUES); 4908 ibmvnic_send_crq(adapter, &crq); 4909 cap_reqs--; 4910 4911 crq.query_capability.capability = cpu_to_be16(MIN_RX_ADD_QUEUES); 4912 ibmvnic_send_crq(adapter, &crq); 4913 cap_reqs--; 4914 4915 crq.query_capability.capability = cpu_to_be16(MAX_TX_QUEUES); 4916 ibmvnic_send_crq(adapter, &crq); 4917 cap_reqs--; 4918 4919 crq.query_capability.capability = cpu_to_be16(MAX_RX_QUEUES); 4920 ibmvnic_send_crq(adapter, &crq); 4921 cap_reqs--; 4922 4923 crq.query_capability.capability = cpu_to_be16(MAX_RX_ADD_QUEUES); 4924 ibmvnic_send_crq(adapter, &crq); 4925 cap_reqs--; 4926 4927 crq.query_capability.capability = 4928 cpu_to_be16(MIN_TX_ENTRIES_PER_SUBCRQ); 4929 ibmvnic_send_crq(adapter, &crq); 4930 cap_reqs--; 4931 4932 crq.query_capability.capability = 4933 cpu_to_be16(MIN_RX_ADD_ENTRIES_PER_SUBCRQ); 4934 ibmvnic_send_crq(adapter, &crq); 4935 cap_reqs--; 4936 4937 crq.query_capability.capability = 4938 cpu_to_be16(MAX_TX_ENTRIES_PER_SUBCRQ); 4939 ibmvnic_send_crq(adapter, &crq); 4940 cap_reqs--; 4941 4942 crq.query_capability.capability = 4943 cpu_to_be16(MAX_RX_ADD_ENTRIES_PER_SUBCRQ); 4944 ibmvnic_send_crq(adapter, &crq); 4945 cap_reqs--; 4946 4947 crq.query_capability.capability = cpu_to_be16(TCP_IP_OFFLOAD); 4948 ibmvnic_send_crq(adapter, &crq); 4949 cap_reqs--; 4950 4951 crq.query_capability.capability = cpu_to_be16(PROMISC_SUPPORTED); 4952 ibmvnic_send_crq(adapter, &crq); 4953 cap_reqs--; 4954 4955 crq.query_capability.capability = cpu_to_be16(MIN_MTU); 4956 ibmvnic_send_crq(adapter, &crq); 4957 cap_reqs--; 4958 4959 crq.query_capability.capability = cpu_to_be16(MAX_MTU); 4960 ibmvnic_send_crq(adapter, &crq); 4961 cap_reqs--; 4962 4963 crq.query_capability.capability = cpu_to_be16(MAX_MULTICAST_FILTERS); 4964 ibmvnic_send_crq(adapter, &crq); 4965 cap_reqs--; 4966 4967 crq.query_capability.capability = cpu_to_be16(VLAN_HEADER_INSERTION); 4968 ibmvnic_send_crq(adapter, &crq); 4969 cap_reqs--; 4970 4971 crq.query_capability.capability = cpu_to_be16(RX_VLAN_HEADER_INSERTION); 4972 ibmvnic_send_crq(adapter, &crq); 4973 cap_reqs--; 4974 4975 crq.query_capability.capability = cpu_to_be16(MAX_TX_SG_ENTRIES); 4976 ibmvnic_send_crq(adapter, &crq); 4977 cap_reqs--; 4978 4979 crq.query_capability.capability = cpu_to_be16(RX_SG_SUPPORTED); 4980 ibmvnic_send_crq(adapter, &crq); 4981 cap_reqs--; 4982 4983 crq.query_capability.capability = cpu_to_be16(OPT_TX_COMP_SUB_QUEUES); 4984 ibmvnic_send_crq(adapter, &crq); 4985 cap_reqs--; 4986 4987 crq.query_capability.capability = cpu_to_be16(OPT_RX_COMP_QUEUES); 4988 ibmvnic_send_crq(adapter, &crq); 4989 cap_reqs--; 4990 4991 crq.query_capability.capability = 4992 cpu_to_be16(OPT_RX_BUFADD_Q_PER_RX_COMP_Q); 4993 ibmvnic_send_crq(adapter, &crq); 4994 cap_reqs--; 4995 4996 crq.query_capability.capability = 4997 cpu_to_be16(OPT_TX_ENTRIES_PER_SUBCRQ); 4998 ibmvnic_send_crq(adapter, &crq); 4999 cap_reqs--; 5000 5001 crq.query_capability.capability = 5002 cpu_to_be16(OPT_RXBA_ENTRIES_PER_SUBCRQ); 5003 ibmvnic_send_crq(adapter, &crq); 5004 cap_reqs--; 5005 5006 crq.query_capability.capability = cpu_to_be16(TX_RX_DESC_REQ); 5007 5008 ibmvnic_send_crq(adapter, &crq); 5009 cap_reqs--; 5010 5011 /* Keep at end to catch any discrepancy between expected and actual 5012 * CRQs sent. 5013 */ 5014 WARN_ON(cap_reqs != 0); 5015 } 5016 5017 static void send_query_ip_offload(struct ibmvnic_adapter *adapter) 5018 { 5019 int buf_sz = sizeof(struct ibmvnic_query_ip_offload_buffer); 5020 struct device *dev = &adapter->vdev->dev; 5021 union ibmvnic_crq crq; 5022 5023 adapter->ip_offload_tok = 5024 dma_map_single(dev, 5025 &adapter->ip_offload_buf, 5026 buf_sz, 5027 DMA_FROM_DEVICE); 5028 5029 if (dma_mapping_error(dev, adapter->ip_offload_tok)) { 5030 if (!firmware_has_feature(FW_FEATURE_CMO)) 5031 dev_err(dev, "Couldn't map offload buffer\n"); 5032 return; 5033 } 5034 5035 memset(&crq, 0, sizeof(crq)); 5036 crq.query_ip_offload.first = IBMVNIC_CRQ_CMD; 5037 crq.query_ip_offload.cmd = QUERY_IP_OFFLOAD; 5038 crq.query_ip_offload.len = cpu_to_be32(buf_sz); 5039 crq.query_ip_offload.ioba = 5040 cpu_to_be32(adapter->ip_offload_tok); 5041 5042 ibmvnic_send_crq(adapter, &crq); 5043 } 5044 5045 static void send_control_ip_offload(struct ibmvnic_adapter *adapter) 5046 { 5047 struct ibmvnic_control_ip_offload_buffer *ctrl_buf = &adapter->ip_offload_ctrl; 5048 struct ibmvnic_query_ip_offload_buffer *buf = &adapter->ip_offload_buf; 5049 struct device *dev = &adapter->vdev->dev; 5050 netdev_features_t old_hw_features = 0; 5051 union ibmvnic_crq crq; 5052 5053 adapter->ip_offload_ctrl_tok = 5054 dma_map_single(dev, 5055 ctrl_buf, 5056 sizeof(adapter->ip_offload_ctrl), 5057 DMA_TO_DEVICE); 5058 5059 if (dma_mapping_error(dev, adapter->ip_offload_ctrl_tok)) { 5060 dev_err(dev, "Couldn't map ip offload control buffer\n"); 5061 return; 5062 } 5063 5064 ctrl_buf->len = cpu_to_be32(sizeof(adapter->ip_offload_ctrl)); 5065 ctrl_buf->version = cpu_to_be32(INITIAL_VERSION_IOB); 5066 ctrl_buf->ipv4_chksum = buf->ipv4_chksum; 5067 ctrl_buf->ipv6_chksum = buf->ipv6_chksum; 5068 ctrl_buf->tcp_ipv4_chksum = buf->tcp_ipv4_chksum; 5069 ctrl_buf->udp_ipv4_chksum = buf->udp_ipv4_chksum; 5070 ctrl_buf->tcp_ipv6_chksum = buf->tcp_ipv6_chksum; 5071 ctrl_buf->udp_ipv6_chksum = buf->udp_ipv6_chksum; 5072 ctrl_buf->large_tx_ipv4 = buf->large_tx_ipv4; 5073 ctrl_buf->large_tx_ipv6 = buf->large_tx_ipv6; 5074 5075 /* large_rx disabled for now, additional features needed */ 5076 ctrl_buf->large_rx_ipv4 = 0; 5077 ctrl_buf->large_rx_ipv6 = 0; 5078 5079 if (adapter->state != VNIC_PROBING) { 5080 old_hw_features = adapter->netdev->hw_features; 5081 adapter->netdev->hw_features = 0; 5082 } 5083 5084 adapter->netdev->hw_features = NETIF_F_SG | NETIF_F_GSO | NETIF_F_GRO; 5085 5086 if (buf->tcp_ipv4_chksum || buf->udp_ipv4_chksum) 5087 adapter->netdev->hw_features |= NETIF_F_IP_CSUM; 5088 5089 if (buf->tcp_ipv6_chksum || buf->udp_ipv6_chksum) 5090 adapter->netdev->hw_features |= NETIF_F_IPV6_CSUM; 5091 5092 if ((adapter->netdev->features & 5093 (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM))) 5094 adapter->netdev->hw_features |= NETIF_F_RXCSUM; 5095 5096 if (buf->large_tx_ipv4) 5097 adapter->netdev->hw_features |= NETIF_F_TSO; 5098 if (buf->large_tx_ipv6) 5099 adapter->netdev->hw_features |= NETIF_F_TSO6; 5100 5101 if (adapter->state == VNIC_PROBING) { 5102 adapter->netdev->features |= adapter->netdev->hw_features; 5103 } else if (old_hw_features != adapter->netdev->hw_features) { 5104 netdev_features_t tmp = 0; 5105 5106 /* disable features no longer supported */ 5107 adapter->netdev->features &= adapter->netdev->hw_features; 5108 /* turn on features now supported if previously enabled */ 5109 tmp = (old_hw_features ^ adapter->netdev->hw_features) & 5110 adapter->netdev->hw_features; 5111 adapter->netdev->features |= 5112 tmp & adapter->netdev->wanted_features; 5113 } 5114 5115 memset(&crq, 0, sizeof(crq)); 5116 crq.control_ip_offload.first = IBMVNIC_CRQ_CMD; 5117 crq.control_ip_offload.cmd = CONTROL_IP_OFFLOAD; 5118 crq.control_ip_offload.len = 5119 cpu_to_be32(sizeof(adapter->ip_offload_ctrl)); 5120 crq.control_ip_offload.ioba = cpu_to_be32(adapter->ip_offload_ctrl_tok); 5121 ibmvnic_send_crq(adapter, &crq); 5122 } 5123 5124 static void handle_vpd_size_rsp(union ibmvnic_crq *crq, 5125 struct ibmvnic_adapter *adapter) 5126 { 5127 struct device *dev = &adapter->vdev->dev; 5128 5129 if (crq->get_vpd_size_rsp.rc.code) { 5130 dev_err(dev, "Error retrieving VPD size, rc=%x\n", 5131 crq->get_vpd_size_rsp.rc.code); 5132 complete(&adapter->fw_done); 5133 return; 5134 } 5135 5136 adapter->vpd->len = be64_to_cpu(crq->get_vpd_size_rsp.len); 5137 complete(&adapter->fw_done); 5138 } 5139 5140 static void handle_vpd_rsp(union ibmvnic_crq *crq, 5141 struct ibmvnic_adapter *adapter) 5142 { 5143 struct device *dev = &adapter->vdev->dev; 5144 unsigned char *substr = NULL; 5145 u8 fw_level_len = 0; 5146 5147 memset(adapter->fw_version, 0, 32); 5148 5149 dma_unmap_single(dev, adapter->vpd->dma_addr, adapter->vpd->len, 5150 DMA_FROM_DEVICE); 5151 5152 if (crq->get_vpd_rsp.rc.code) { 5153 dev_err(dev, "Error retrieving VPD from device, rc=%x\n", 5154 crq->get_vpd_rsp.rc.code); 5155 goto complete; 5156 } 5157 5158 /* get the position of the firmware version info 5159 * located after the ASCII 'RM' substring in the buffer 5160 */ 5161 substr = strnstr(adapter->vpd->buff, "RM", adapter->vpd->len); 5162 if (!substr) { 5163 dev_info(dev, "Warning - No FW level has been provided in the VPD buffer by the VIOS Server\n"); 5164 goto complete; 5165 } 5166 5167 /* get length of firmware level ASCII substring */ 5168 if ((substr + 2) < (adapter->vpd->buff + adapter->vpd->len)) { 5169 fw_level_len = *(substr + 2); 5170 } else { 5171 dev_info(dev, "Length of FW substr extrapolated VDP buff\n"); 5172 goto complete; 5173 } 5174 5175 /* copy firmware version string from vpd into adapter */ 5176 if ((substr + 3 + fw_level_len) < 5177 (adapter->vpd->buff + adapter->vpd->len)) { 5178 strncpy((char *)adapter->fw_version, substr + 3, fw_level_len); 5179 } else { 5180 dev_info(dev, "FW substr extrapolated VPD buff\n"); 5181 } 5182 5183 complete: 5184 if (adapter->fw_version[0] == '\0') 5185 strscpy((char *)adapter->fw_version, "N/A", sizeof(adapter->fw_version)); 5186 complete(&adapter->fw_done); 5187 } 5188 5189 static void handle_query_ip_offload_rsp(struct ibmvnic_adapter *adapter) 5190 { 5191 struct device *dev = &adapter->vdev->dev; 5192 struct ibmvnic_query_ip_offload_buffer *buf = &adapter->ip_offload_buf; 5193 int i; 5194 5195 dma_unmap_single(dev, adapter->ip_offload_tok, 5196 sizeof(adapter->ip_offload_buf), DMA_FROM_DEVICE); 5197 5198 netdev_dbg(adapter->netdev, "Query IP Offload Buffer:\n"); 5199 for (i = 0; i < (sizeof(adapter->ip_offload_buf) - 1) / 8 + 1; i++) 5200 netdev_dbg(adapter->netdev, "%016lx\n", 5201 ((unsigned long *)(buf))[i]); 5202 5203 netdev_dbg(adapter->netdev, "ipv4_chksum = %d\n", buf->ipv4_chksum); 5204 netdev_dbg(adapter->netdev, "ipv6_chksum = %d\n", buf->ipv6_chksum); 5205 netdev_dbg(adapter->netdev, "tcp_ipv4_chksum = %d\n", 5206 buf->tcp_ipv4_chksum); 5207 netdev_dbg(adapter->netdev, "tcp_ipv6_chksum = %d\n", 5208 buf->tcp_ipv6_chksum); 5209 netdev_dbg(adapter->netdev, "udp_ipv4_chksum = %d\n", 5210 buf->udp_ipv4_chksum); 5211 netdev_dbg(adapter->netdev, "udp_ipv6_chksum = %d\n", 5212 buf->udp_ipv6_chksum); 5213 netdev_dbg(adapter->netdev, "large_tx_ipv4 = %d\n", 5214 buf->large_tx_ipv4); 5215 netdev_dbg(adapter->netdev, "large_tx_ipv6 = %d\n", 5216 buf->large_tx_ipv6); 5217 netdev_dbg(adapter->netdev, "large_rx_ipv4 = %d\n", 5218 buf->large_rx_ipv4); 5219 netdev_dbg(adapter->netdev, "large_rx_ipv6 = %d\n", 5220 buf->large_rx_ipv6); 5221 netdev_dbg(adapter->netdev, "max_ipv4_hdr_sz = %d\n", 5222 buf->max_ipv4_header_size); 5223 netdev_dbg(adapter->netdev, "max_ipv6_hdr_sz = %d\n", 5224 buf->max_ipv6_header_size); 5225 netdev_dbg(adapter->netdev, "max_tcp_hdr_size = %d\n", 5226 buf->max_tcp_header_size); 5227 netdev_dbg(adapter->netdev, "max_udp_hdr_size = %d\n", 5228 buf->max_udp_header_size); 5229 netdev_dbg(adapter->netdev, "max_large_tx_size = %d\n", 5230 buf->max_large_tx_size); 5231 netdev_dbg(adapter->netdev, "max_large_rx_size = %d\n", 5232 buf->max_large_rx_size); 5233 netdev_dbg(adapter->netdev, "ipv6_ext_hdr = %d\n", 5234 buf->ipv6_extension_header); 5235 netdev_dbg(adapter->netdev, "tcp_pseudosum_req = %d\n", 5236 buf->tcp_pseudosum_req); 5237 netdev_dbg(adapter->netdev, "num_ipv6_ext_hd = %d\n", 5238 buf->num_ipv6_ext_headers); 5239 netdev_dbg(adapter->netdev, "off_ipv6_ext_hd = %d\n", 5240 buf->off_ipv6_ext_headers); 5241 5242 send_control_ip_offload(adapter); 5243 } 5244 5245 static const char *ibmvnic_fw_err_cause(u16 cause) 5246 { 5247 switch (cause) { 5248 case ADAPTER_PROBLEM: 5249 return "adapter problem"; 5250 case BUS_PROBLEM: 5251 return "bus problem"; 5252 case FW_PROBLEM: 5253 return "firmware problem"; 5254 case DD_PROBLEM: 5255 return "device driver problem"; 5256 case EEH_RECOVERY: 5257 return "EEH recovery"; 5258 case FW_UPDATED: 5259 return "firmware updated"; 5260 case LOW_MEMORY: 5261 return "low Memory"; 5262 default: 5263 return "unknown"; 5264 } 5265 } 5266 5267 static void handle_error_indication(union ibmvnic_crq *crq, 5268 struct ibmvnic_adapter *adapter) 5269 { 5270 struct device *dev = &adapter->vdev->dev; 5271 u16 cause; 5272 5273 cause = be16_to_cpu(crq->error_indication.error_cause); 5274 5275 dev_warn_ratelimited(dev, 5276 "Firmware reports %serror, cause: %s. Starting recovery...\n", 5277 crq->error_indication.flags 5278 & IBMVNIC_FATAL_ERROR ? "FATAL " : "", 5279 ibmvnic_fw_err_cause(cause)); 5280 5281 if (crq->error_indication.flags & IBMVNIC_FATAL_ERROR) 5282 ibmvnic_reset(adapter, VNIC_RESET_FATAL); 5283 else 5284 ibmvnic_reset(adapter, VNIC_RESET_NON_FATAL); 5285 } 5286 5287 static int handle_change_mac_rsp(union ibmvnic_crq *crq, 5288 struct ibmvnic_adapter *adapter) 5289 { 5290 struct net_device *netdev = adapter->netdev; 5291 struct device *dev = &adapter->vdev->dev; 5292 long rc; 5293 5294 rc = crq->change_mac_addr_rsp.rc.code; 5295 if (rc) { 5296 dev_err(dev, "Error %ld in CHANGE_MAC_ADDR_RSP\n", rc); 5297 goto out; 5298 } 5299 /* crq->change_mac_addr.mac_addr is the requested one 5300 * crq->change_mac_addr_rsp.mac_addr is the returned valid one. 5301 */ 5302 eth_hw_addr_set(netdev, &crq->change_mac_addr_rsp.mac_addr[0]); 5303 ether_addr_copy(adapter->mac_addr, 5304 &crq->change_mac_addr_rsp.mac_addr[0]); 5305 out: 5306 complete(&adapter->fw_done); 5307 return rc; 5308 } 5309 5310 static void handle_request_cap_rsp(union ibmvnic_crq *crq, 5311 struct ibmvnic_adapter *adapter) 5312 { 5313 struct device *dev = &adapter->vdev->dev; 5314 u64 *req_value; 5315 char *name; 5316 5317 atomic_dec(&adapter->running_cap_crqs); 5318 netdev_dbg(adapter->netdev, "Outstanding request-caps: %d\n", 5319 atomic_read(&adapter->running_cap_crqs)); 5320 switch (be16_to_cpu(crq->request_capability_rsp.capability)) { 5321 case REQ_TX_QUEUES: 5322 req_value = &adapter->req_tx_queues; 5323 name = "tx"; 5324 break; 5325 case REQ_RX_QUEUES: 5326 req_value = &adapter->req_rx_queues; 5327 name = "rx"; 5328 break; 5329 case REQ_RX_ADD_QUEUES: 5330 req_value = &adapter->req_rx_add_queues; 5331 name = "rx_add"; 5332 break; 5333 case REQ_TX_ENTRIES_PER_SUBCRQ: 5334 req_value = &adapter->req_tx_entries_per_subcrq; 5335 name = "tx_entries_per_subcrq"; 5336 break; 5337 case REQ_RX_ADD_ENTRIES_PER_SUBCRQ: 5338 req_value = &adapter->req_rx_add_entries_per_subcrq; 5339 name = "rx_add_entries_per_subcrq"; 5340 break; 5341 case REQ_MTU: 5342 req_value = &adapter->req_mtu; 5343 name = "mtu"; 5344 break; 5345 case PROMISC_REQUESTED: 5346 req_value = &adapter->promisc; 5347 name = "promisc"; 5348 break; 5349 default: 5350 dev_err(dev, "Got invalid cap request rsp %d\n", 5351 crq->request_capability.capability); 5352 return; 5353 } 5354 5355 switch (crq->request_capability_rsp.rc.code) { 5356 case SUCCESS: 5357 break; 5358 case PARTIALSUCCESS: 5359 dev_info(dev, "req=%lld, rsp=%ld in %s queue, retrying.\n", 5360 *req_value, 5361 (long)be64_to_cpu(crq->request_capability_rsp.number), 5362 name); 5363 5364 if (be16_to_cpu(crq->request_capability_rsp.capability) == 5365 REQ_MTU) { 5366 pr_err("mtu of %llu is not supported. Reverting.\n", 5367 *req_value); 5368 *req_value = adapter->fallback.mtu; 5369 } else { 5370 *req_value = 5371 be64_to_cpu(crq->request_capability_rsp.number); 5372 } 5373 5374 send_request_cap(adapter, 1); 5375 return; 5376 default: 5377 dev_err(dev, "Error %d in request cap rsp\n", 5378 crq->request_capability_rsp.rc.code); 5379 return; 5380 } 5381 5382 /* Done receiving requested capabilities, query IP offload support */ 5383 if (atomic_read(&adapter->running_cap_crqs) == 0) 5384 send_query_ip_offload(adapter); 5385 } 5386 5387 static int handle_login_rsp(union ibmvnic_crq *login_rsp_crq, 5388 struct ibmvnic_adapter *adapter) 5389 { 5390 struct device *dev = &adapter->vdev->dev; 5391 struct net_device *netdev = adapter->netdev; 5392 struct ibmvnic_login_rsp_buffer *login_rsp = adapter->login_rsp_buf; 5393 struct ibmvnic_login_buffer *login = adapter->login_buf; 5394 u64 *tx_handle_array; 5395 u64 *rx_handle_array; 5396 int num_tx_pools; 5397 int num_rx_pools; 5398 u64 *size_array; 5399 int i; 5400 5401 /* CHECK: Test/set of login_pending does not need to be atomic 5402 * because only ibmvnic_tasklet tests/clears this. 5403 */ 5404 if (!adapter->login_pending) { 5405 netdev_warn(netdev, "Ignoring unexpected login response\n"); 5406 return 0; 5407 } 5408 adapter->login_pending = false; 5409 5410 dma_unmap_single(dev, adapter->login_buf_token, adapter->login_buf_sz, 5411 DMA_TO_DEVICE); 5412 dma_unmap_single(dev, adapter->login_rsp_buf_token, 5413 adapter->login_rsp_buf_sz, DMA_FROM_DEVICE); 5414 5415 /* If the number of queues requested can't be allocated by the 5416 * server, the login response will return with code 1. We will need 5417 * to resend the login buffer with fewer queues requested. 5418 */ 5419 if (login_rsp_crq->generic.rc.code) { 5420 adapter->init_done_rc = login_rsp_crq->generic.rc.code; 5421 complete(&adapter->init_done); 5422 return 0; 5423 } 5424 5425 if (adapter->failover_pending) { 5426 adapter->init_done_rc = -EAGAIN; 5427 netdev_dbg(netdev, "Failover pending, ignoring login response\n"); 5428 complete(&adapter->init_done); 5429 /* login response buffer will be released on reset */ 5430 return 0; 5431 } 5432 5433 netdev->mtu = adapter->req_mtu - ETH_HLEN; 5434 5435 netdev_dbg(adapter->netdev, "Login Response Buffer:\n"); 5436 for (i = 0; i < (adapter->login_rsp_buf_sz - 1) / 8 + 1; i++) { 5437 netdev_dbg(adapter->netdev, "%016lx\n", 5438 ((unsigned long *)(adapter->login_rsp_buf))[i]); 5439 } 5440 5441 /* Sanity checks */ 5442 if (login->num_txcomp_subcrqs != login_rsp->num_txsubm_subcrqs || 5443 (be32_to_cpu(login->num_rxcomp_subcrqs) * 5444 adapter->req_rx_add_queues != 5445 be32_to_cpu(login_rsp->num_rxadd_subcrqs))) { 5446 dev_err(dev, "FATAL: Inconsistent login and login rsp\n"); 5447 ibmvnic_reset(adapter, VNIC_RESET_FATAL); 5448 return -EIO; 5449 } 5450 size_array = (u64 *)((u8 *)(adapter->login_rsp_buf) + 5451 be32_to_cpu(adapter->login_rsp_buf->off_rxadd_buff_size)); 5452 /* variable buffer sizes are not supported, so just read the 5453 * first entry. 5454 */ 5455 adapter->cur_rx_buf_sz = be64_to_cpu(size_array[0]); 5456 5457 num_tx_pools = be32_to_cpu(adapter->login_rsp_buf->num_txsubm_subcrqs); 5458 num_rx_pools = be32_to_cpu(adapter->login_rsp_buf->num_rxadd_subcrqs); 5459 5460 tx_handle_array = (u64 *)((u8 *)(adapter->login_rsp_buf) + 5461 be32_to_cpu(adapter->login_rsp_buf->off_txsubm_subcrqs)); 5462 rx_handle_array = (u64 *)((u8 *)(adapter->login_rsp_buf) + 5463 be32_to_cpu(adapter->login_rsp_buf->off_rxadd_subcrqs)); 5464 5465 for (i = 0; i < num_tx_pools; i++) 5466 adapter->tx_scrq[i]->handle = tx_handle_array[i]; 5467 5468 for (i = 0; i < num_rx_pools; i++) 5469 adapter->rx_scrq[i]->handle = rx_handle_array[i]; 5470 5471 adapter->num_active_tx_scrqs = num_tx_pools; 5472 adapter->num_active_rx_scrqs = num_rx_pools; 5473 release_login_rsp_buffer(adapter); 5474 release_login_buffer(adapter); 5475 complete(&adapter->init_done); 5476 5477 return 0; 5478 } 5479 5480 static void handle_request_unmap_rsp(union ibmvnic_crq *crq, 5481 struct ibmvnic_adapter *adapter) 5482 { 5483 struct device *dev = &adapter->vdev->dev; 5484 long rc; 5485 5486 rc = crq->request_unmap_rsp.rc.code; 5487 if (rc) 5488 dev_err(dev, "Error %ld in REQUEST_UNMAP_RSP\n", rc); 5489 } 5490 5491 static void handle_query_map_rsp(union ibmvnic_crq *crq, 5492 struct ibmvnic_adapter *adapter) 5493 { 5494 struct net_device *netdev = adapter->netdev; 5495 struct device *dev = &adapter->vdev->dev; 5496 long rc; 5497 5498 rc = crq->query_map_rsp.rc.code; 5499 if (rc) { 5500 dev_err(dev, "Error %ld in QUERY_MAP_RSP\n", rc); 5501 return; 5502 } 5503 netdev_dbg(netdev, "page_size = %d\ntot_pages = %u\nfree_pages = %u\n", 5504 crq->query_map_rsp.page_size, 5505 __be32_to_cpu(crq->query_map_rsp.tot_pages), 5506 __be32_to_cpu(crq->query_map_rsp.free_pages)); 5507 } 5508 5509 static void handle_query_cap_rsp(union ibmvnic_crq *crq, 5510 struct ibmvnic_adapter *adapter) 5511 { 5512 struct net_device *netdev = adapter->netdev; 5513 struct device *dev = &adapter->vdev->dev; 5514 long rc; 5515 5516 atomic_dec(&adapter->running_cap_crqs); 5517 netdev_dbg(netdev, "Outstanding queries: %d\n", 5518 atomic_read(&adapter->running_cap_crqs)); 5519 rc = crq->query_capability.rc.code; 5520 if (rc) { 5521 dev_err(dev, "Error %ld in QUERY_CAP_RSP\n", rc); 5522 goto out; 5523 } 5524 5525 switch (be16_to_cpu(crq->query_capability.capability)) { 5526 case MIN_TX_QUEUES: 5527 adapter->min_tx_queues = 5528 be64_to_cpu(crq->query_capability.number); 5529 netdev_dbg(netdev, "min_tx_queues = %lld\n", 5530 adapter->min_tx_queues); 5531 break; 5532 case MIN_RX_QUEUES: 5533 adapter->min_rx_queues = 5534 be64_to_cpu(crq->query_capability.number); 5535 netdev_dbg(netdev, "min_rx_queues = %lld\n", 5536 adapter->min_rx_queues); 5537 break; 5538 case MIN_RX_ADD_QUEUES: 5539 adapter->min_rx_add_queues = 5540 be64_to_cpu(crq->query_capability.number); 5541 netdev_dbg(netdev, "min_rx_add_queues = %lld\n", 5542 adapter->min_rx_add_queues); 5543 break; 5544 case MAX_TX_QUEUES: 5545 adapter->max_tx_queues = 5546 be64_to_cpu(crq->query_capability.number); 5547 netdev_dbg(netdev, "max_tx_queues = %lld\n", 5548 adapter->max_tx_queues); 5549 break; 5550 case MAX_RX_QUEUES: 5551 adapter->max_rx_queues = 5552 be64_to_cpu(crq->query_capability.number); 5553 netdev_dbg(netdev, "max_rx_queues = %lld\n", 5554 adapter->max_rx_queues); 5555 break; 5556 case MAX_RX_ADD_QUEUES: 5557 adapter->max_rx_add_queues = 5558 be64_to_cpu(crq->query_capability.number); 5559 netdev_dbg(netdev, "max_rx_add_queues = %lld\n", 5560 adapter->max_rx_add_queues); 5561 break; 5562 case MIN_TX_ENTRIES_PER_SUBCRQ: 5563 adapter->min_tx_entries_per_subcrq = 5564 be64_to_cpu(crq->query_capability.number); 5565 netdev_dbg(netdev, "min_tx_entries_per_subcrq = %lld\n", 5566 adapter->min_tx_entries_per_subcrq); 5567 break; 5568 case MIN_RX_ADD_ENTRIES_PER_SUBCRQ: 5569 adapter->min_rx_add_entries_per_subcrq = 5570 be64_to_cpu(crq->query_capability.number); 5571 netdev_dbg(netdev, "min_rx_add_entrs_per_subcrq = %lld\n", 5572 adapter->min_rx_add_entries_per_subcrq); 5573 break; 5574 case MAX_TX_ENTRIES_PER_SUBCRQ: 5575 adapter->max_tx_entries_per_subcrq = 5576 be64_to_cpu(crq->query_capability.number); 5577 netdev_dbg(netdev, "max_tx_entries_per_subcrq = %lld\n", 5578 adapter->max_tx_entries_per_subcrq); 5579 break; 5580 case MAX_RX_ADD_ENTRIES_PER_SUBCRQ: 5581 adapter->max_rx_add_entries_per_subcrq = 5582 be64_to_cpu(crq->query_capability.number); 5583 netdev_dbg(netdev, "max_rx_add_entrs_per_subcrq = %lld\n", 5584 adapter->max_rx_add_entries_per_subcrq); 5585 break; 5586 case TCP_IP_OFFLOAD: 5587 adapter->tcp_ip_offload = 5588 be64_to_cpu(crq->query_capability.number); 5589 netdev_dbg(netdev, "tcp_ip_offload = %lld\n", 5590 adapter->tcp_ip_offload); 5591 break; 5592 case PROMISC_SUPPORTED: 5593 adapter->promisc_supported = 5594 be64_to_cpu(crq->query_capability.number); 5595 netdev_dbg(netdev, "promisc_supported = %lld\n", 5596 adapter->promisc_supported); 5597 break; 5598 case MIN_MTU: 5599 adapter->min_mtu = be64_to_cpu(crq->query_capability.number); 5600 netdev->min_mtu = adapter->min_mtu - ETH_HLEN; 5601 netdev_dbg(netdev, "min_mtu = %lld\n", adapter->min_mtu); 5602 break; 5603 case MAX_MTU: 5604 adapter->max_mtu = be64_to_cpu(crq->query_capability.number); 5605 netdev->max_mtu = adapter->max_mtu - ETH_HLEN; 5606 netdev_dbg(netdev, "max_mtu = %lld\n", adapter->max_mtu); 5607 break; 5608 case MAX_MULTICAST_FILTERS: 5609 adapter->max_multicast_filters = 5610 be64_to_cpu(crq->query_capability.number); 5611 netdev_dbg(netdev, "max_multicast_filters = %lld\n", 5612 adapter->max_multicast_filters); 5613 break; 5614 case VLAN_HEADER_INSERTION: 5615 adapter->vlan_header_insertion = 5616 be64_to_cpu(crq->query_capability.number); 5617 if (adapter->vlan_header_insertion) 5618 netdev->features |= NETIF_F_HW_VLAN_STAG_TX; 5619 netdev_dbg(netdev, "vlan_header_insertion = %lld\n", 5620 adapter->vlan_header_insertion); 5621 break; 5622 case RX_VLAN_HEADER_INSERTION: 5623 adapter->rx_vlan_header_insertion = 5624 be64_to_cpu(crq->query_capability.number); 5625 netdev_dbg(netdev, "rx_vlan_header_insertion = %lld\n", 5626 adapter->rx_vlan_header_insertion); 5627 break; 5628 case MAX_TX_SG_ENTRIES: 5629 adapter->max_tx_sg_entries = 5630 be64_to_cpu(crq->query_capability.number); 5631 netdev_dbg(netdev, "max_tx_sg_entries = %lld\n", 5632 adapter->max_tx_sg_entries); 5633 break; 5634 case RX_SG_SUPPORTED: 5635 adapter->rx_sg_supported = 5636 be64_to_cpu(crq->query_capability.number); 5637 netdev_dbg(netdev, "rx_sg_supported = %lld\n", 5638 adapter->rx_sg_supported); 5639 break; 5640 case OPT_TX_COMP_SUB_QUEUES: 5641 adapter->opt_tx_comp_sub_queues = 5642 be64_to_cpu(crq->query_capability.number); 5643 netdev_dbg(netdev, "opt_tx_comp_sub_queues = %lld\n", 5644 adapter->opt_tx_comp_sub_queues); 5645 break; 5646 case OPT_RX_COMP_QUEUES: 5647 adapter->opt_rx_comp_queues = 5648 be64_to_cpu(crq->query_capability.number); 5649 netdev_dbg(netdev, "opt_rx_comp_queues = %lld\n", 5650 adapter->opt_rx_comp_queues); 5651 break; 5652 case OPT_RX_BUFADD_Q_PER_RX_COMP_Q: 5653 adapter->opt_rx_bufadd_q_per_rx_comp_q = 5654 be64_to_cpu(crq->query_capability.number); 5655 netdev_dbg(netdev, "opt_rx_bufadd_q_per_rx_comp_q = %lld\n", 5656 adapter->opt_rx_bufadd_q_per_rx_comp_q); 5657 break; 5658 case OPT_TX_ENTRIES_PER_SUBCRQ: 5659 adapter->opt_tx_entries_per_subcrq = 5660 be64_to_cpu(crq->query_capability.number); 5661 netdev_dbg(netdev, "opt_tx_entries_per_subcrq = %lld\n", 5662 adapter->opt_tx_entries_per_subcrq); 5663 break; 5664 case OPT_RXBA_ENTRIES_PER_SUBCRQ: 5665 adapter->opt_rxba_entries_per_subcrq = 5666 be64_to_cpu(crq->query_capability.number); 5667 netdev_dbg(netdev, "opt_rxba_entries_per_subcrq = %lld\n", 5668 adapter->opt_rxba_entries_per_subcrq); 5669 break; 5670 case TX_RX_DESC_REQ: 5671 adapter->tx_rx_desc_req = crq->query_capability.number; 5672 netdev_dbg(netdev, "tx_rx_desc_req = %llx\n", 5673 adapter->tx_rx_desc_req); 5674 break; 5675 5676 default: 5677 netdev_err(netdev, "Got invalid cap rsp %d\n", 5678 crq->query_capability.capability); 5679 } 5680 5681 out: 5682 if (atomic_read(&adapter->running_cap_crqs) == 0) 5683 send_request_cap(adapter, 0); 5684 } 5685 5686 static int send_query_phys_parms(struct ibmvnic_adapter *adapter) 5687 { 5688 union ibmvnic_crq crq; 5689 int rc; 5690 5691 memset(&crq, 0, sizeof(crq)); 5692 crq.query_phys_parms.first = IBMVNIC_CRQ_CMD; 5693 crq.query_phys_parms.cmd = QUERY_PHYS_PARMS; 5694 5695 mutex_lock(&adapter->fw_lock); 5696 adapter->fw_done_rc = 0; 5697 reinit_completion(&adapter->fw_done); 5698 5699 rc = ibmvnic_send_crq(adapter, &crq); 5700 if (rc) { 5701 mutex_unlock(&adapter->fw_lock); 5702 return rc; 5703 } 5704 5705 rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000); 5706 if (rc) { 5707 mutex_unlock(&adapter->fw_lock); 5708 return rc; 5709 } 5710 5711 mutex_unlock(&adapter->fw_lock); 5712 return adapter->fw_done_rc ? -EIO : 0; 5713 } 5714 5715 static int handle_query_phys_parms_rsp(union ibmvnic_crq *crq, 5716 struct ibmvnic_adapter *adapter) 5717 { 5718 struct net_device *netdev = adapter->netdev; 5719 int rc; 5720 __be32 rspeed = cpu_to_be32(crq->query_phys_parms_rsp.speed); 5721 5722 rc = crq->query_phys_parms_rsp.rc.code; 5723 if (rc) { 5724 netdev_err(netdev, "Error %d in QUERY_PHYS_PARMS\n", rc); 5725 return rc; 5726 } 5727 switch (rspeed) { 5728 case IBMVNIC_10MBPS: 5729 adapter->speed = SPEED_10; 5730 break; 5731 case IBMVNIC_100MBPS: 5732 adapter->speed = SPEED_100; 5733 break; 5734 case IBMVNIC_1GBPS: 5735 adapter->speed = SPEED_1000; 5736 break; 5737 case IBMVNIC_10GBPS: 5738 adapter->speed = SPEED_10000; 5739 break; 5740 case IBMVNIC_25GBPS: 5741 adapter->speed = SPEED_25000; 5742 break; 5743 case IBMVNIC_40GBPS: 5744 adapter->speed = SPEED_40000; 5745 break; 5746 case IBMVNIC_50GBPS: 5747 adapter->speed = SPEED_50000; 5748 break; 5749 case IBMVNIC_100GBPS: 5750 adapter->speed = SPEED_100000; 5751 break; 5752 case IBMVNIC_200GBPS: 5753 adapter->speed = SPEED_200000; 5754 break; 5755 default: 5756 if (netif_carrier_ok(netdev)) 5757 netdev_warn(netdev, "Unknown speed 0x%08x\n", rspeed); 5758 adapter->speed = SPEED_UNKNOWN; 5759 } 5760 if (crq->query_phys_parms_rsp.flags1 & IBMVNIC_FULL_DUPLEX) 5761 adapter->duplex = DUPLEX_FULL; 5762 else if (crq->query_phys_parms_rsp.flags1 & IBMVNIC_HALF_DUPLEX) 5763 adapter->duplex = DUPLEX_HALF; 5764 else 5765 adapter->duplex = DUPLEX_UNKNOWN; 5766 5767 return rc; 5768 } 5769 5770 static void ibmvnic_handle_crq(union ibmvnic_crq *crq, 5771 struct ibmvnic_adapter *adapter) 5772 { 5773 struct ibmvnic_generic_crq *gen_crq = &crq->generic; 5774 struct net_device *netdev = adapter->netdev; 5775 struct device *dev = &adapter->vdev->dev; 5776 u64 *u64_crq = (u64 *)crq; 5777 long rc; 5778 5779 netdev_dbg(netdev, "Handling CRQ: %016lx %016lx\n", 5780 (unsigned long)cpu_to_be64(u64_crq[0]), 5781 (unsigned long)cpu_to_be64(u64_crq[1])); 5782 switch (gen_crq->first) { 5783 case IBMVNIC_CRQ_INIT_RSP: 5784 switch (gen_crq->cmd) { 5785 case IBMVNIC_CRQ_INIT: 5786 dev_info(dev, "Partner initialized\n"); 5787 adapter->from_passive_init = true; 5788 /* Discard any stale login responses from prev reset. 5789 * CHECK: should we clear even on INIT_COMPLETE? 5790 */ 5791 adapter->login_pending = false; 5792 5793 if (adapter->state == VNIC_DOWN) 5794 rc = ibmvnic_reset(adapter, VNIC_RESET_PASSIVE_INIT); 5795 else 5796 rc = ibmvnic_reset(adapter, VNIC_RESET_FAILOVER); 5797 5798 if (rc && rc != -EBUSY) { 5799 /* We were unable to schedule the failover 5800 * reset either because the adapter was still 5801 * probing (eg: during kexec) or we could not 5802 * allocate memory. Clear the failover_pending 5803 * flag since no one else will. We ignore 5804 * EBUSY because it means either FAILOVER reset 5805 * is already scheduled or the adapter is 5806 * being removed. 5807 */ 5808 netdev_err(netdev, 5809 "Error %ld scheduling failover reset\n", 5810 rc); 5811 adapter->failover_pending = false; 5812 } 5813 5814 if (!completion_done(&adapter->init_done)) { 5815 if (!adapter->init_done_rc) 5816 adapter->init_done_rc = -EAGAIN; 5817 complete(&adapter->init_done); 5818 } 5819 5820 break; 5821 case IBMVNIC_CRQ_INIT_COMPLETE: 5822 dev_info(dev, "Partner initialization complete\n"); 5823 adapter->crq.active = true; 5824 send_version_xchg(adapter); 5825 break; 5826 default: 5827 dev_err(dev, "Unknown crq cmd: %d\n", gen_crq->cmd); 5828 } 5829 return; 5830 case IBMVNIC_CRQ_XPORT_EVENT: 5831 netif_carrier_off(netdev); 5832 adapter->crq.active = false; 5833 /* terminate any thread waiting for a response 5834 * from the device 5835 */ 5836 if (!completion_done(&adapter->fw_done)) { 5837 adapter->fw_done_rc = -EIO; 5838 complete(&adapter->fw_done); 5839 } 5840 5841 /* if we got here during crq-init, retry crq-init */ 5842 if (!completion_done(&adapter->init_done)) { 5843 adapter->init_done_rc = -EAGAIN; 5844 complete(&adapter->init_done); 5845 } 5846 5847 if (!completion_done(&adapter->stats_done)) 5848 complete(&adapter->stats_done); 5849 if (test_bit(0, &adapter->resetting)) 5850 adapter->force_reset_recovery = true; 5851 if (gen_crq->cmd == IBMVNIC_PARTITION_MIGRATED) { 5852 dev_info(dev, "Migrated, re-enabling adapter\n"); 5853 ibmvnic_reset(adapter, VNIC_RESET_MOBILITY); 5854 } else if (gen_crq->cmd == IBMVNIC_DEVICE_FAILOVER) { 5855 dev_info(dev, "Backing device failover detected\n"); 5856 adapter->failover_pending = true; 5857 } else { 5858 /* The adapter lost the connection */ 5859 dev_err(dev, "Virtual Adapter failed (rc=%d)\n", 5860 gen_crq->cmd); 5861 ibmvnic_reset(adapter, VNIC_RESET_FATAL); 5862 } 5863 return; 5864 case IBMVNIC_CRQ_CMD_RSP: 5865 break; 5866 default: 5867 dev_err(dev, "Got an invalid msg type 0x%02x\n", 5868 gen_crq->first); 5869 return; 5870 } 5871 5872 switch (gen_crq->cmd) { 5873 case VERSION_EXCHANGE_RSP: 5874 rc = crq->version_exchange_rsp.rc.code; 5875 if (rc) { 5876 dev_err(dev, "Error %ld in VERSION_EXCHG_RSP\n", rc); 5877 break; 5878 } 5879 ibmvnic_version = 5880 be16_to_cpu(crq->version_exchange_rsp.version); 5881 dev_info(dev, "Partner protocol version is %d\n", 5882 ibmvnic_version); 5883 send_query_cap(adapter); 5884 break; 5885 case QUERY_CAPABILITY_RSP: 5886 handle_query_cap_rsp(crq, adapter); 5887 break; 5888 case QUERY_MAP_RSP: 5889 handle_query_map_rsp(crq, adapter); 5890 break; 5891 case REQUEST_MAP_RSP: 5892 adapter->fw_done_rc = crq->request_map_rsp.rc.code; 5893 complete(&adapter->fw_done); 5894 break; 5895 case REQUEST_UNMAP_RSP: 5896 handle_request_unmap_rsp(crq, adapter); 5897 break; 5898 case REQUEST_CAPABILITY_RSP: 5899 handle_request_cap_rsp(crq, adapter); 5900 break; 5901 case LOGIN_RSP: 5902 netdev_dbg(netdev, "Got Login Response\n"); 5903 handle_login_rsp(crq, adapter); 5904 break; 5905 case LOGICAL_LINK_STATE_RSP: 5906 netdev_dbg(netdev, 5907 "Got Logical Link State Response, state: %d rc: %d\n", 5908 crq->logical_link_state_rsp.link_state, 5909 crq->logical_link_state_rsp.rc.code); 5910 adapter->logical_link_state = 5911 crq->logical_link_state_rsp.link_state; 5912 adapter->init_done_rc = crq->logical_link_state_rsp.rc.code; 5913 complete(&adapter->init_done); 5914 break; 5915 case LINK_STATE_INDICATION: 5916 netdev_dbg(netdev, "Got Logical Link State Indication\n"); 5917 adapter->phys_link_state = 5918 crq->link_state_indication.phys_link_state; 5919 adapter->logical_link_state = 5920 crq->link_state_indication.logical_link_state; 5921 if (adapter->phys_link_state && adapter->logical_link_state) 5922 netif_carrier_on(netdev); 5923 else 5924 netif_carrier_off(netdev); 5925 break; 5926 case CHANGE_MAC_ADDR_RSP: 5927 netdev_dbg(netdev, "Got MAC address change Response\n"); 5928 adapter->fw_done_rc = handle_change_mac_rsp(crq, adapter); 5929 break; 5930 case ERROR_INDICATION: 5931 netdev_dbg(netdev, "Got Error Indication\n"); 5932 handle_error_indication(crq, adapter); 5933 break; 5934 case REQUEST_STATISTICS_RSP: 5935 netdev_dbg(netdev, "Got Statistics Response\n"); 5936 complete(&adapter->stats_done); 5937 break; 5938 case QUERY_IP_OFFLOAD_RSP: 5939 netdev_dbg(netdev, "Got Query IP offload Response\n"); 5940 handle_query_ip_offload_rsp(adapter); 5941 break; 5942 case MULTICAST_CTRL_RSP: 5943 netdev_dbg(netdev, "Got multicast control Response\n"); 5944 break; 5945 case CONTROL_IP_OFFLOAD_RSP: 5946 netdev_dbg(netdev, "Got Control IP offload Response\n"); 5947 dma_unmap_single(dev, adapter->ip_offload_ctrl_tok, 5948 sizeof(adapter->ip_offload_ctrl), 5949 DMA_TO_DEVICE); 5950 complete(&adapter->init_done); 5951 break; 5952 case COLLECT_FW_TRACE_RSP: 5953 netdev_dbg(netdev, "Got Collect firmware trace Response\n"); 5954 complete(&adapter->fw_done); 5955 break; 5956 case GET_VPD_SIZE_RSP: 5957 handle_vpd_size_rsp(crq, adapter); 5958 break; 5959 case GET_VPD_RSP: 5960 handle_vpd_rsp(crq, adapter); 5961 break; 5962 case QUERY_PHYS_PARMS_RSP: 5963 adapter->fw_done_rc = handle_query_phys_parms_rsp(crq, adapter); 5964 complete(&adapter->fw_done); 5965 break; 5966 default: 5967 netdev_err(netdev, "Got an invalid cmd type 0x%02x\n", 5968 gen_crq->cmd); 5969 } 5970 } 5971 5972 static irqreturn_t ibmvnic_interrupt(int irq, void *instance) 5973 { 5974 struct ibmvnic_adapter *adapter = instance; 5975 5976 tasklet_schedule(&adapter->tasklet); 5977 return IRQ_HANDLED; 5978 } 5979 5980 static void ibmvnic_tasklet(struct tasklet_struct *t) 5981 { 5982 struct ibmvnic_adapter *adapter = from_tasklet(adapter, t, tasklet); 5983 struct ibmvnic_crq_queue *queue = &adapter->crq; 5984 union ibmvnic_crq *crq; 5985 unsigned long flags; 5986 5987 spin_lock_irqsave(&queue->lock, flags); 5988 5989 /* Pull all the valid messages off the CRQ */ 5990 while ((crq = ibmvnic_next_crq(adapter)) != NULL) { 5991 /* This barrier makes sure ibmvnic_next_crq()'s 5992 * crq->generic.first & IBMVNIC_CRQ_CMD_RSP is loaded 5993 * before ibmvnic_handle_crq()'s 5994 * switch(gen_crq->first) and switch(gen_crq->cmd). 5995 */ 5996 dma_rmb(); 5997 ibmvnic_handle_crq(crq, adapter); 5998 crq->generic.first = 0; 5999 } 6000 6001 spin_unlock_irqrestore(&queue->lock, flags); 6002 } 6003 6004 static int ibmvnic_reenable_crq_queue(struct ibmvnic_adapter *adapter) 6005 { 6006 struct vio_dev *vdev = adapter->vdev; 6007 int rc; 6008 6009 do { 6010 rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address); 6011 } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc)); 6012 6013 if (rc) 6014 dev_err(&vdev->dev, "Error enabling adapter (rc=%d)\n", rc); 6015 6016 return rc; 6017 } 6018 6019 static int ibmvnic_reset_crq(struct ibmvnic_adapter *adapter) 6020 { 6021 struct ibmvnic_crq_queue *crq = &adapter->crq; 6022 struct device *dev = &adapter->vdev->dev; 6023 struct vio_dev *vdev = adapter->vdev; 6024 int rc; 6025 6026 /* Close the CRQ */ 6027 do { 6028 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); 6029 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); 6030 6031 /* Clean out the queue */ 6032 if (!crq->msgs) 6033 return -EINVAL; 6034 6035 memset(crq->msgs, 0, PAGE_SIZE); 6036 crq->cur = 0; 6037 crq->active = false; 6038 6039 /* And re-open it again */ 6040 rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address, 6041 crq->msg_token, PAGE_SIZE); 6042 6043 if (rc == H_CLOSED) 6044 /* Adapter is good, but other end is not ready */ 6045 dev_warn(dev, "Partner adapter not ready\n"); 6046 else if (rc != 0) 6047 dev_warn(dev, "Couldn't register crq (rc=%d)\n", rc); 6048 6049 return rc; 6050 } 6051 6052 static void release_crq_queue(struct ibmvnic_adapter *adapter) 6053 { 6054 struct ibmvnic_crq_queue *crq = &adapter->crq; 6055 struct vio_dev *vdev = adapter->vdev; 6056 long rc; 6057 6058 if (!crq->msgs) 6059 return; 6060 6061 netdev_dbg(adapter->netdev, "Releasing CRQ\n"); 6062 free_irq(vdev->irq, adapter); 6063 tasklet_kill(&adapter->tasklet); 6064 do { 6065 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); 6066 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); 6067 6068 dma_unmap_single(&vdev->dev, crq->msg_token, PAGE_SIZE, 6069 DMA_BIDIRECTIONAL); 6070 free_page((unsigned long)crq->msgs); 6071 crq->msgs = NULL; 6072 crq->active = false; 6073 } 6074 6075 static int init_crq_queue(struct ibmvnic_adapter *adapter) 6076 { 6077 struct ibmvnic_crq_queue *crq = &adapter->crq; 6078 struct device *dev = &adapter->vdev->dev; 6079 struct vio_dev *vdev = adapter->vdev; 6080 int rc, retrc = -ENOMEM; 6081 6082 if (crq->msgs) 6083 return 0; 6084 6085 crq->msgs = (union ibmvnic_crq *)get_zeroed_page(GFP_KERNEL); 6086 /* Should we allocate more than one page? */ 6087 6088 if (!crq->msgs) 6089 return -ENOMEM; 6090 6091 crq->size = PAGE_SIZE / sizeof(*crq->msgs); 6092 crq->msg_token = dma_map_single(dev, crq->msgs, PAGE_SIZE, 6093 DMA_BIDIRECTIONAL); 6094 if (dma_mapping_error(dev, crq->msg_token)) 6095 goto map_failed; 6096 6097 rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address, 6098 crq->msg_token, PAGE_SIZE); 6099 6100 if (rc == H_RESOURCE) 6101 /* maybe kexecing and resource is busy. try a reset */ 6102 rc = ibmvnic_reset_crq(adapter); 6103 retrc = rc; 6104 6105 if (rc == H_CLOSED) { 6106 dev_warn(dev, "Partner adapter not ready\n"); 6107 } else if (rc) { 6108 dev_warn(dev, "Error %d opening adapter\n", rc); 6109 goto reg_crq_failed; 6110 } 6111 6112 retrc = 0; 6113 6114 tasklet_setup(&adapter->tasklet, (void *)ibmvnic_tasklet); 6115 6116 netdev_dbg(adapter->netdev, "registering irq 0x%x\n", vdev->irq); 6117 snprintf(crq->name, sizeof(crq->name), "ibmvnic-%x", 6118 adapter->vdev->unit_address); 6119 rc = request_irq(vdev->irq, ibmvnic_interrupt, 0, crq->name, adapter); 6120 if (rc) { 6121 dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", 6122 vdev->irq, rc); 6123 goto req_irq_failed; 6124 } 6125 6126 rc = vio_enable_interrupts(vdev); 6127 if (rc) { 6128 dev_err(dev, "Error %d enabling interrupts\n", rc); 6129 goto req_irq_failed; 6130 } 6131 6132 crq->cur = 0; 6133 spin_lock_init(&crq->lock); 6134 6135 /* process any CRQs that were queued before we enabled interrupts */ 6136 tasklet_schedule(&adapter->tasklet); 6137 6138 return retrc; 6139 6140 req_irq_failed: 6141 tasklet_kill(&adapter->tasklet); 6142 do { 6143 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); 6144 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); 6145 reg_crq_failed: 6146 dma_unmap_single(dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL); 6147 map_failed: 6148 free_page((unsigned long)crq->msgs); 6149 crq->msgs = NULL; 6150 return retrc; 6151 } 6152 6153 static int ibmvnic_reset_init(struct ibmvnic_adapter *adapter, bool reset) 6154 { 6155 struct device *dev = &adapter->vdev->dev; 6156 unsigned long timeout = msecs_to_jiffies(20000); 6157 u64 old_num_rx_queues = adapter->req_rx_queues; 6158 u64 old_num_tx_queues = adapter->req_tx_queues; 6159 int rc; 6160 6161 adapter->from_passive_init = false; 6162 6163 rc = ibmvnic_send_crq_init(adapter); 6164 if (rc) { 6165 dev_err(dev, "Send crq init failed with error %d\n", rc); 6166 return rc; 6167 } 6168 6169 if (!wait_for_completion_timeout(&adapter->init_done, timeout)) { 6170 dev_err(dev, "Initialization sequence timed out\n"); 6171 return -ETIMEDOUT; 6172 } 6173 6174 if (adapter->init_done_rc) { 6175 release_crq_queue(adapter); 6176 dev_err(dev, "CRQ-init failed, %d\n", adapter->init_done_rc); 6177 return adapter->init_done_rc; 6178 } 6179 6180 if (adapter->from_passive_init) { 6181 adapter->state = VNIC_OPEN; 6182 adapter->from_passive_init = false; 6183 dev_err(dev, "CRQ-init failed, passive-init\n"); 6184 return -EINVAL; 6185 } 6186 6187 if (reset && 6188 test_bit(0, &adapter->resetting) && !adapter->wait_for_reset && 6189 adapter->reset_reason != VNIC_RESET_MOBILITY) { 6190 if (adapter->req_rx_queues != old_num_rx_queues || 6191 adapter->req_tx_queues != old_num_tx_queues) { 6192 release_sub_crqs(adapter, 0); 6193 rc = init_sub_crqs(adapter); 6194 } else { 6195 /* no need to reinitialize completely, but we do 6196 * need to clean up transmits that were in flight 6197 * when we processed the reset. Failure to do so 6198 * will confound the upper layer, usually TCP, by 6199 * creating the illusion of transmits that are 6200 * awaiting completion. 6201 */ 6202 clean_tx_pools(adapter); 6203 6204 rc = reset_sub_crq_queues(adapter); 6205 } 6206 } else { 6207 rc = init_sub_crqs(adapter); 6208 } 6209 6210 if (rc) { 6211 dev_err(dev, "Initialization of sub crqs failed\n"); 6212 release_crq_queue(adapter); 6213 return rc; 6214 } 6215 6216 rc = init_sub_crq_irqs(adapter); 6217 if (rc) { 6218 dev_err(dev, "Failed to initialize sub crq irqs\n"); 6219 release_crq_queue(adapter); 6220 } 6221 6222 return rc; 6223 } 6224 6225 static struct device_attribute dev_attr_failover; 6226 6227 static int ibmvnic_probe(struct vio_dev *dev, const struct vio_device_id *id) 6228 { 6229 struct ibmvnic_adapter *adapter; 6230 struct net_device *netdev; 6231 unsigned char *mac_addr_p; 6232 unsigned long flags; 6233 bool init_success; 6234 int rc; 6235 6236 dev_dbg(&dev->dev, "entering ibmvnic_probe for UA 0x%x\n", 6237 dev->unit_address); 6238 6239 mac_addr_p = (unsigned char *)vio_get_attribute(dev, 6240 VETH_MAC_ADDR, NULL); 6241 if (!mac_addr_p) { 6242 dev_err(&dev->dev, 6243 "(%s:%3.3d) ERROR: Can't find MAC_ADDR attribute\n", 6244 __FILE__, __LINE__); 6245 return 0; 6246 } 6247 6248 netdev = alloc_etherdev_mq(sizeof(struct ibmvnic_adapter), 6249 IBMVNIC_MAX_QUEUES); 6250 if (!netdev) 6251 return -ENOMEM; 6252 6253 adapter = netdev_priv(netdev); 6254 adapter->state = VNIC_PROBING; 6255 dev_set_drvdata(&dev->dev, netdev); 6256 adapter->vdev = dev; 6257 adapter->netdev = netdev; 6258 adapter->login_pending = false; 6259 memset(&adapter->map_ids, 0, sizeof(adapter->map_ids)); 6260 /* map_ids start at 1, so ensure map_id 0 is always "in-use" */ 6261 bitmap_set(adapter->map_ids, 0, 1); 6262 6263 ether_addr_copy(adapter->mac_addr, mac_addr_p); 6264 eth_hw_addr_set(netdev, adapter->mac_addr); 6265 netdev->irq = dev->irq; 6266 netdev->netdev_ops = &ibmvnic_netdev_ops; 6267 netdev->ethtool_ops = &ibmvnic_ethtool_ops; 6268 SET_NETDEV_DEV(netdev, &dev->dev); 6269 6270 INIT_WORK(&adapter->ibmvnic_reset, __ibmvnic_reset); 6271 INIT_DELAYED_WORK(&adapter->ibmvnic_delayed_reset, 6272 __ibmvnic_delayed_reset); 6273 INIT_LIST_HEAD(&adapter->rwi_list); 6274 spin_lock_init(&adapter->rwi_lock); 6275 spin_lock_init(&adapter->state_lock); 6276 mutex_init(&adapter->fw_lock); 6277 init_completion(&adapter->probe_done); 6278 init_completion(&adapter->init_done); 6279 init_completion(&adapter->fw_done); 6280 init_completion(&adapter->reset_done); 6281 init_completion(&adapter->stats_done); 6282 clear_bit(0, &adapter->resetting); 6283 adapter->prev_rx_buf_sz = 0; 6284 adapter->prev_mtu = 0; 6285 6286 init_success = false; 6287 do { 6288 reinit_init_done(adapter); 6289 6290 /* clear any failovers we got in the previous pass 6291 * since we are reinitializing the CRQ 6292 */ 6293 adapter->failover_pending = false; 6294 6295 /* If we had already initialized CRQ, we may have one or 6296 * more resets queued already. Discard those and release 6297 * the CRQ before initializing the CRQ again. 6298 */ 6299 release_crq_queue(adapter); 6300 6301 /* Since we are still in PROBING state, __ibmvnic_reset() 6302 * will not access the ->rwi_list and since we released CRQ, 6303 * we won't get _new_ transport events. But there maybe an 6304 * ongoing ibmvnic_reset() call. So serialize access to 6305 * rwi_list. If we win the race, ibvmnic_reset() could add 6306 * a reset after we purged but thats ok - we just may end 6307 * up with an extra reset (i.e similar to having two or more 6308 * resets in the queue at once). 6309 * CHECK. 6310 */ 6311 spin_lock_irqsave(&adapter->rwi_lock, flags); 6312 flush_reset_queue(adapter); 6313 spin_unlock_irqrestore(&adapter->rwi_lock, flags); 6314 6315 rc = init_crq_queue(adapter); 6316 if (rc) { 6317 dev_err(&dev->dev, "Couldn't initialize crq. rc=%d\n", 6318 rc); 6319 goto ibmvnic_init_fail; 6320 } 6321 6322 rc = ibmvnic_reset_init(adapter, false); 6323 } while (rc == -EAGAIN); 6324 6325 /* We are ignoring the error from ibmvnic_reset_init() assuming that the 6326 * partner is not ready. CRQ is not active. When the partner becomes 6327 * ready, we will do the passive init reset. 6328 */ 6329 6330 if (!rc) 6331 init_success = true; 6332 6333 rc = init_stats_buffers(adapter); 6334 if (rc) 6335 goto ibmvnic_init_fail; 6336 6337 rc = init_stats_token(adapter); 6338 if (rc) 6339 goto ibmvnic_stats_fail; 6340 6341 rc = device_create_file(&dev->dev, &dev_attr_failover); 6342 if (rc) 6343 goto ibmvnic_dev_file_err; 6344 6345 netif_carrier_off(netdev); 6346 6347 if (init_success) { 6348 adapter->state = VNIC_PROBED; 6349 netdev->mtu = adapter->req_mtu - ETH_HLEN; 6350 netdev->min_mtu = adapter->min_mtu - ETH_HLEN; 6351 netdev->max_mtu = adapter->max_mtu - ETH_HLEN; 6352 } else { 6353 adapter->state = VNIC_DOWN; 6354 } 6355 6356 adapter->wait_for_reset = false; 6357 adapter->last_reset_time = jiffies; 6358 6359 rc = register_netdev(netdev); 6360 if (rc) { 6361 dev_err(&dev->dev, "failed to register netdev rc=%d\n", rc); 6362 goto ibmvnic_register_fail; 6363 } 6364 dev_info(&dev->dev, "ibmvnic registered\n"); 6365 6366 rc = ibmvnic_cpu_notif_add(adapter); 6367 if (rc) { 6368 netdev_err(netdev, "Registering cpu notifier failed\n"); 6369 goto cpu_notif_add_failed; 6370 } 6371 6372 complete(&adapter->probe_done); 6373 6374 return 0; 6375 6376 cpu_notif_add_failed: 6377 unregister_netdev(netdev); 6378 6379 ibmvnic_register_fail: 6380 device_remove_file(&dev->dev, &dev_attr_failover); 6381 6382 ibmvnic_dev_file_err: 6383 release_stats_token(adapter); 6384 6385 ibmvnic_stats_fail: 6386 release_stats_buffers(adapter); 6387 6388 ibmvnic_init_fail: 6389 release_sub_crqs(adapter, 1); 6390 release_crq_queue(adapter); 6391 6392 /* cleanup worker thread after releasing CRQ so we don't get 6393 * transport events (i.e new work items for the worker thread). 6394 */ 6395 adapter->state = VNIC_REMOVING; 6396 complete(&adapter->probe_done); 6397 flush_work(&adapter->ibmvnic_reset); 6398 flush_delayed_work(&adapter->ibmvnic_delayed_reset); 6399 6400 flush_reset_queue(adapter); 6401 6402 mutex_destroy(&adapter->fw_lock); 6403 free_netdev(netdev); 6404 6405 return rc; 6406 } 6407 6408 static void ibmvnic_remove(struct vio_dev *dev) 6409 { 6410 struct net_device *netdev = dev_get_drvdata(&dev->dev); 6411 struct ibmvnic_adapter *adapter = netdev_priv(netdev); 6412 unsigned long flags; 6413 6414 spin_lock_irqsave(&adapter->state_lock, flags); 6415 6416 /* If ibmvnic_reset() is scheduling a reset, wait for it to 6417 * finish. Then, set the state to REMOVING to prevent it from 6418 * scheduling any more work and to have reset functions ignore 6419 * any resets that have already been scheduled. Drop the lock 6420 * after setting state, so __ibmvnic_reset() which is called 6421 * from the flush_work() below, can make progress. 6422 */ 6423 spin_lock(&adapter->rwi_lock); 6424 adapter->state = VNIC_REMOVING; 6425 spin_unlock(&adapter->rwi_lock); 6426 6427 spin_unlock_irqrestore(&adapter->state_lock, flags); 6428 6429 ibmvnic_cpu_notif_remove(adapter); 6430 6431 flush_work(&adapter->ibmvnic_reset); 6432 flush_delayed_work(&adapter->ibmvnic_delayed_reset); 6433 6434 rtnl_lock(); 6435 unregister_netdevice(netdev); 6436 6437 release_resources(adapter); 6438 release_rx_pools(adapter); 6439 release_tx_pools(adapter); 6440 release_sub_crqs(adapter, 1); 6441 release_crq_queue(adapter); 6442 6443 release_stats_token(adapter); 6444 release_stats_buffers(adapter); 6445 6446 adapter->state = VNIC_REMOVED; 6447 6448 rtnl_unlock(); 6449 mutex_destroy(&adapter->fw_lock); 6450 device_remove_file(&dev->dev, &dev_attr_failover); 6451 free_netdev(netdev); 6452 dev_set_drvdata(&dev->dev, NULL); 6453 } 6454 6455 static ssize_t failover_store(struct device *dev, struct device_attribute *attr, 6456 const char *buf, size_t count) 6457 { 6458 struct net_device *netdev = dev_get_drvdata(dev); 6459 struct ibmvnic_adapter *adapter = netdev_priv(netdev); 6460 unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; 6461 __be64 session_token; 6462 long rc; 6463 6464 if (!sysfs_streq(buf, "1")) 6465 return -EINVAL; 6466 6467 rc = plpar_hcall(H_VIOCTL, retbuf, adapter->vdev->unit_address, 6468 H_GET_SESSION_TOKEN, 0, 0, 0); 6469 if (rc) { 6470 netdev_err(netdev, "Couldn't retrieve session token, rc %ld\n", 6471 rc); 6472 goto last_resort; 6473 } 6474 6475 session_token = (__be64)retbuf[0]; 6476 netdev_dbg(netdev, "Initiating client failover, session id %llx\n", 6477 be64_to_cpu(session_token)); 6478 rc = plpar_hcall_norets(H_VIOCTL, adapter->vdev->unit_address, 6479 H_SESSION_ERR_DETECTED, session_token, 0, 0); 6480 if (rc) { 6481 netdev_err(netdev, 6482 "H_VIOCTL initiated failover failed, rc %ld\n", 6483 rc); 6484 goto last_resort; 6485 } 6486 6487 return count; 6488 6489 last_resort: 6490 netdev_dbg(netdev, "Trying to send CRQ_CMD, the last resort\n"); 6491 ibmvnic_reset(adapter, VNIC_RESET_FAILOVER); 6492 6493 return count; 6494 } 6495 static DEVICE_ATTR_WO(failover); 6496 6497 static unsigned long ibmvnic_get_desired_dma(struct vio_dev *vdev) 6498 { 6499 struct net_device *netdev = dev_get_drvdata(&vdev->dev); 6500 struct ibmvnic_adapter *adapter; 6501 struct iommu_table *tbl; 6502 unsigned long ret = 0; 6503 int i; 6504 6505 tbl = get_iommu_table_base(&vdev->dev); 6506 6507 /* netdev inits at probe time along with the structures we need below*/ 6508 if (!netdev) 6509 return IOMMU_PAGE_ALIGN(IBMVNIC_IO_ENTITLEMENT_DEFAULT, tbl); 6510 6511 adapter = netdev_priv(netdev); 6512 6513 ret += PAGE_SIZE; /* the crq message queue */ 6514 ret += IOMMU_PAGE_ALIGN(sizeof(struct ibmvnic_statistics), tbl); 6515 6516 for (i = 0; i < adapter->req_tx_queues + adapter->req_rx_queues; i++) 6517 ret += 4 * PAGE_SIZE; /* the scrq message queue */ 6518 6519 for (i = 0; i < adapter->num_active_rx_pools; i++) 6520 ret += adapter->rx_pool[i].size * 6521 IOMMU_PAGE_ALIGN(adapter->rx_pool[i].buff_size, tbl); 6522 6523 return ret; 6524 } 6525 6526 static int ibmvnic_resume(struct device *dev) 6527 { 6528 struct net_device *netdev = dev_get_drvdata(dev); 6529 struct ibmvnic_adapter *adapter = netdev_priv(netdev); 6530 6531 if (adapter->state != VNIC_OPEN) 6532 return 0; 6533 6534 tasklet_schedule(&adapter->tasklet); 6535 6536 return 0; 6537 } 6538 6539 static const struct vio_device_id ibmvnic_device_table[] = { 6540 {"network", "IBM,vnic"}, 6541 {"", "" } 6542 }; 6543 MODULE_DEVICE_TABLE(vio, ibmvnic_device_table); 6544 6545 static const struct dev_pm_ops ibmvnic_pm_ops = { 6546 .resume = ibmvnic_resume 6547 }; 6548 6549 static struct vio_driver ibmvnic_driver = { 6550 .id_table = ibmvnic_device_table, 6551 .probe = ibmvnic_probe, 6552 .remove = ibmvnic_remove, 6553 .get_desired_dma = ibmvnic_get_desired_dma, 6554 .name = ibmvnic_driver_name, 6555 .pm = &ibmvnic_pm_ops, 6556 }; 6557 6558 /* module functions */ 6559 static int __init ibmvnic_module_init(void) 6560 { 6561 int ret; 6562 6563 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "net/ibmvnic:online", 6564 ibmvnic_cpu_online, 6565 ibmvnic_cpu_down_prep); 6566 if (ret < 0) 6567 goto out; 6568 ibmvnic_online = ret; 6569 ret = cpuhp_setup_state_multi(CPUHP_IBMVNIC_DEAD, "net/ibmvnic:dead", 6570 NULL, ibmvnic_cpu_dead); 6571 if (ret) 6572 goto err_dead; 6573 6574 ret = vio_register_driver(&ibmvnic_driver); 6575 if (ret) 6576 goto err_vio_register; 6577 6578 pr_info("%s: %s %s\n", ibmvnic_driver_name, ibmvnic_driver_string, 6579 IBMVNIC_DRIVER_VERSION); 6580 6581 return 0; 6582 err_vio_register: 6583 cpuhp_remove_multi_state(CPUHP_IBMVNIC_DEAD); 6584 err_dead: 6585 cpuhp_remove_multi_state(ibmvnic_online); 6586 out: 6587 return ret; 6588 } 6589 6590 static void __exit ibmvnic_module_exit(void) 6591 { 6592 vio_unregister_driver(&ibmvnic_driver); 6593 cpuhp_remove_multi_state(CPUHP_IBMVNIC_DEAD); 6594 cpuhp_remove_multi_state(ibmvnic_online); 6595 } 6596 6597 module_init(ibmvnic_module_init); 6598 module_exit(ibmvnic_module_exit); 6599