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