1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * IBM Power Virtual Ethernet Device Driver 4 * 5 * Copyright (C) IBM Corporation, 2003, 2010 6 * 7 * Authors: Dave Larson <larson1@us.ibm.com> 8 * Santiago Leon <santil@linux.vnet.ibm.com> 9 * Brian King <brking@linux.vnet.ibm.com> 10 * Robert Jennings <rcj@linux.vnet.ibm.com> 11 * Anton Blanchard <anton@au.ibm.com> 12 */ 13 14 #include <linux/module.h> 15 #include <linux/types.h> 16 #include <linux/errno.h> 17 #include <linux/dma-mapping.h> 18 #include <linux/kernel.h> 19 #include <linux/netdevice.h> 20 #include <linux/etherdevice.h> 21 #include <linux/skbuff.h> 22 #include <linux/init.h> 23 #include <linux/interrupt.h> 24 #include <linux/mm.h> 25 #include <linux/pm.h> 26 #include <linux/ethtool.h> 27 #include <linux/in.h> 28 #include <linux/ip.h> 29 #include <linux/ipv6.h> 30 #include <linux/slab.h> 31 #include <asm/hvcall.h> 32 #include <linux/atomic.h> 33 #include <asm/vio.h> 34 #include <asm/iommu.h> 35 #include <asm/firmware.h> 36 #include <net/tcp.h> 37 #include <net/ip6_checksum.h> 38 39 #include "ibmveth.h" 40 41 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance); 42 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter); 43 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev); 44 45 static struct kobj_type ktype_veth_pool; 46 47 48 static const char ibmveth_driver_name[] = "ibmveth"; 49 static const char ibmveth_driver_string[] = "IBM Power Virtual Ethernet Driver"; 50 #define ibmveth_driver_version "1.06" 51 52 MODULE_AUTHOR("Santiago Leon <santil@linux.vnet.ibm.com>"); 53 MODULE_DESCRIPTION("IBM Power Virtual Ethernet Driver"); 54 MODULE_LICENSE("GPL"); 55 MODULE_VERSION(ibmveth_driver_version); 56 57 static unsigned int tx_copybreak __read_mostly = 128; 58 module_param(tx_copybreak, uint, 0644); 59 MODULE_PARM_DESC(tx_copybreak, 60 "Maximum size of packet that is copied to a new buffer on transmit"); 61 62 static unsigned int rx_copybreak __read_mostly = 128; 63 module_param(rx_copybreak, uint, 0644); 64 MODULE_PARM_DESC(rx_copybreak, 65 "Maximum size of packet that is copied to a new buffer on receive"); 66 67 static unsigned int rx_flush __read_mostly = 0; 68 module_param(rx_flush, uint, 0644); 69 MODULE_PARM_DESC(rx_flush, "Flush receive buffers before use"); 70 71 static bool old_large_send __read_mostly; 72 module_param(old_large_send, bool, 0444); 73 MODULE_PARM_DESC(old_large_send, 74 "Use old large send method on firmware that supports the new method"); 75 76 struct ibmveth_stat { 77 char name[ETH_GSTRING_LEN]; 78 int offset; 79 }; 80 81 #define IBMVETH_STAT_OFF(stat) offsetof(struct ibmveth_adapter, stat) 82 #define IBMVETH_GET_STAT(a, off) *((u64 *)(((unsigned long)(a)) + off)) 83 84 static struct ibmveth_stat ibmveth_stats[] = { 85 { "replenish_task_cycles", IBMVETH_STAT_OFF(replenish_task_cycles) }, 86 { "replenish_no_mem", IBMVETH_STAT_OFF(replenish_no_mem) }, 87 { "replenish_add_buff_failure", 88 IBMVETH_STAT_OFF(replenish_add_buff_failure) }, 89 { "replenish_add_buff_success", 90 IBMVETH_STAT_OFF(replenish_add_buff_success) }, 91 { "rx_invalid_buffer", IBMVETH_STAT_OFF(rx_invalid_buffer) }, 92 { "rx_no_buffer", IBMVETH_STAT_OFF(rx_no_buffer) }, 93 { "tx_map_failed", IBMVETH_STAT_OFF(tx_map_failed) }, 94 { "tx_send_failed", IBMVETH_STAT_OFF(tx_send_failed) }, 95 { "fw_enabled_ipv4_csum", IBMVETH_STAT_OFF(fw_ipv4_csum_support) }, 96 { "fw_enabled_ipv6_csum", IBMVETH_STAT_OFF(fw_ipv6_csum_support) }, 97 { "tx_large_packets", IBMVETH_STAT_OFF(tx_large_packets) }, 98 { "rx_large_packets", IBMVETH_STAT_OFF(rx_large_packets) }, 99 { "fw_enabled_large_send", IBMVETH_STAT_OFF(fw_large_send_support) } 100 }; 101 102 /* simple methods of getting data from the current rxq entry */ 103 static inline u32 ibmveth_rxq_flags(struct ibmveth_adapter *adapter) 104 { 105 return be32_to_cpu(adapter->rx_queue.queue_addr[adapter->rx_queue.index].flags_off); 106 } 107 108 static inline int ibmveth_rxq_toggle(struct ibmveth_adapter *adapter) 109 { 110 return (ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_TOGGLE) >> 111 IBMVETH_RXQ_TOGGLE_SHIFT; 112 } 113 114 static inline int ibmveth_rxq_pending_buffer(struct ibmveth_adapter *adapter) 115 { 116 return ibmveth_rxq_toggle(adapter) == adapter->rx_queue.toggle; 117 } 118 119 static inline int ibmveth_rxq_buffer_valid(struct ibmveth_adapter *adapter) 120 { 121 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_VALID; 122 } 123 124 static inline int ibmveth_rxq_frame_offset(struct ibmveth_adapter *adapter) 125 { 126 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_OFF_MASK; 127 } 128 129 static inline int ibmveth_rxq_large_packet(struct ibmveth_adapter *adapter) 130 { 131 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_LRG_PKT; 132 } 133 134 static inline int ibmveth_rxq_frame_length(struct ibmveth_adapter *adapter) 135 { 136 return be32_to_cpu(adapter->rx_queue.queue_addr[adapter->rx_queue.index].length); 137 } 138 139 static inline int ibmveth_rxq_csum_good(struct ibmveth_adapter *adapter) 140 { 141 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_CSUM_GOOD; 142 } 143 144 static unsigned int ibmveth_real_max_tx_queues(void) 145 { 146 unsigned int n_cpu = num_online_cpus(); 147 148 return min(n_cpu, IBMVETH_MAX_QUEUES); 149 } 150 151 /* setup the initial settings for a buffer pool */ 152 static void ibmveth_init_buffer_pool(struct ibmveth_buff_pool *pool, 153 u32 pool_index, u32 pool_size, 154 u32 buff_size, u32 pool_active) 155 { 156 pool->size = pool_size; 157 pool->index = pool_index; 158 pool->buff_size = buff_size; 159 pool->threshold = pool_size * 7 / 8; 160 pool->active = pool_active; 161 } 162 163 /* allocate and setup an buffer pool - called during open */ 164 static int ibmveth_alloc_buffer_pool(struct ibmveth_buff_pool *pool) 165 { 166 int i; 167 168 pool->free_map = kmalloc_array(pool->size, sizeof(u16), GFP_KERNEL); 169 170 if (!pool->free_map) 171 return -1; 172 173 pool->dma_addr = kcalloc(pool->size, sizeof(dma_addr_t), GFP_KERNEL); 174 if (!pool->dma_addr) { 175 kfree(pool->free_map); 176 pool->free_map = NULL; 177 return -1; 178 } 179 180 pool->skbuff = kcalloc(pool->size, sizeof(void *), GFP_KERNEL); 181 182 if (!pool->skbuff) { 183 kfree(pool->dma_addr); 184 pool->dma_addr = NULL; 185 186 kfree(pool->free_map); 187 pool->free_map = NULL; 188 return -1; 189 } 190 191 for (i = 0; i < pool->size; ++i) 192 pool->free_map[i] = i; 193 194 atomic_set(&pool->available, 0); 195 pool->producer_index = 0; 196 pool->consumer_index = 0; 197 198 return 0; 199 } 200 201 static inline void ibmveth_flush_buffer(void *addr, unsigned long length) 202 { 203 unsigned long offset; 204 205 for (offset = 0; offset < length; offset += SMP_CACHE_BYTES) 206 asm("dcbf %0,%1,1" :: "b" (addr), "r" (offset)); 207 } 208 209 /* replenish the buffers for a pool. note that we don't need to 210 * skb_reserve these since they are used for incoming... 211 */ 212 static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter, 213 struct ibmveth_buff_pool *pool) 214 { 215 u32 i; 216 u32 count = pool->size - atomic_read(&pool->available); 217 u32 buffers_added = 0; 218 struct sk_buff *skb; 219 unsigned int free_index, index; 220 u64 correlator; 221 unsigned long lpar_rc; 222 dma_addr_t dma_addr; 223 224 mb(); 225 226 for (i = 0; i < count; ++i) { 227 union ibmveth_buf_desc desc; 228 229 skb = netdev_alloc_skb(adapter->netdev, pool->buff_size); 230 231 if (!skb) { 232 netdev_dbg(adapter->netdev, 233 "replenish: unable to allocate skb\n"); 234 adapter->replenish_no_mem++; 235 break; 236 } 237 238 free_index = pool->consumer_index; 239 pool->consumer_index++; 240 if (pool->consumer_index >= pool->size) 241 pool->consumer_index = 0; 242 index = pool->free_map[free_index]; 243 244 BUG_ON(index == IBM_VETH_INVALID_MAP); 245 BUG_ON(pool->skbuff[index] != NULL); 246 247 dma_addr = dma_map_single(&adapter->vdev->dev, skb->data, 248 pool->buff_size, DMA_FROM_DEVICE); 249 250 if (dma_mapping_error(&adapter->vdev->dev, dma_addr)) 251 goto failure; 252 253 pool->free_map[free_index] = IBM_VETH_INVALID_MAP; 254 pool->dma_addr[index] = dma_addr; 255 pool->skbuff[index] = skb; 256 257 correlator = ((u64)pool->index << 32) | index; 258 *(u64 *)skb->data = correlator; 259 260 desc.fields.flags_len = IBMVETH_BUF_VALID | pool->buff_size; 261 desc.fields.address = dma_addr; 262 263 if (rx_flush) { 264 unsigned int len = min(pool->buff_size, 265 adapter->netdev->mtu + 266 IBMVETH_BUFF_OH); 267 ibmveth_flush_buffer(skb->data, len); 268 } 269 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, 270 desc.desc); 271 272 if (lpar_rc != H_SUCCESS) { 273 goto failure; 274 } else { 275 buffers_added++; 276 adapter->replenish_add_buff_success++; 277 } 278 } 279 280 mb(); 281 atomic_add(buffers_added, &(pool->available)); 282 return; 283 284 failure: 285 pool->free_map[free_index] = index; 286 pool->skbuff[index] = NULL; 287 if (pool->consumer_index == 0) 288 pool->consumer_index = pool->size - 1; 289 else 290 pool->consumer_index--; 291 if (!dma_mapping_error(&adapter->vdev->dev, dma_addr)) 292 dma_unmap_single(&adapter->vdev->dev, 293 pool->dma_addr[index], pool->buff_size, 294 DMA_FROM_DEVICE); 295 dev_kfree_skb_any(skb); 296 adapter->replenish_add_buff_failure++; 297 298 mb(); 299 atomic_add(buffers_added, &(pool->available)); 300 } 301 302 /* 303 * The final 8 bytes of the buffer list is a counter of frames dropped 304 * because there was not a buffer in the buffer list capable of holding 305 * the frame. 306 */ 307 static void ibmveth_update_rx_no_buffer(struct ibmveth_adapter *adapter) 308 { 309 __be64 *p = adapter->buffer_list_addr + 4096 - 8; 310 311 adapter->rx_no_buffer = be64_to_cpup(p); 312 } 313 314 /* replenish routine */ 315 static void ibmveth_replenish_task(struct ibmveth_adapter *adapter) 316 { 317 int i; 318 319 adapter->replenish_task_cycles++; 320 321 for (i = (IBMVETH_NUM_BUFF_POOLS - 1); i >= 0; i--) { 322 struct ibmveth_buff_pool *pool = &adapter->rx_buff_pool[i]; 323 324 if (pool->active && 325 (atomic_read(&pool->available) < pool->threshold)) 326 ibmveth_replenish_buffer_pool(adapter, pool); 327 } 328 329 ibmveth_update_rx_no_buffer(adapter); 330 } 331 332 /* empty and free ana buffer pool - also used to do cleanup in error paths */ 333 static void ibmveth_free_buffer_pool(struct ibmveth_adapter *adapter, 334 struct ibmveth_buff_pool *pool) 335 { 336 int i; 337 338 kfree(pool->free_map); 339 pool->free_map = NULL; 340 341 if (pool->skbuff && pool->dma_addr) { 342 for (i = 0; i < pool->size; ++i) { 343 struct sk_buff *skb = pool->skbuff[i]; 344 if (skb) { 345 dma_unmap_single(&adapter->vdev->dev, 346 pool->dma_addr[i], 347 pool->buff_size, 348 DMA_FROM_DEVICE); 349 dev_kfree_skb_any(skb); 350 pool->skbuff[i] = NULL; 351 } 352 } 353 } 354 355 if (pool->dma_addr) { 356 kfree(pool->dma_addr); 357 pool->dma_addr = NULL; 358 } 359 360 if (pool->skbuff) { 361 kfree(pool->skbuff); 362 pool->skbuff = NULL; 363 } 364 } 365 366 /* remove a buffer from a pool */ 367 static void ibmveth_remove_buffer_from_pool(struct ibmveth_adapter *adapter, 368 u64 correlator) 369 { 370 unsigned int pool = correlator >> 32; 371 unsigned int index = correlator & 0xffffffffUL; 372 unsigned int free_index; 373 struct sk_buff *skb; 374 375 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS); 376 BUG_ON(index >= adapter->rx_buff_pool[pool].size); 377 378 skb = adapter->rx_buff_pool[pool].skbuff[index]; 379 380 BUG_ON(skb == NULL); 381 382 adapter->rx_buff_pool[pool].skbuff[index] = NULL; 383 384 dma_unmap_single(&adapter->vdev->dev, 385 adapter->rx_buff_pool[pool].dma_addr[index], 386 adapter->rx_buff_pool[pool].buff_size, 387 DMA_FROM_DEVICE); 388 389 free_index = adapter->rx_buff_pool[pool].producer_index; 390 adapter->rx_buff_pool[pool].producer_index++; 391 if (adapter->rx_buff_pool[pool].producer_index >= 392 adapter->rx_buff_pool[pool].size) 393 adapter->rx_buff_pool[pool].producer_index = 0; 394 adapter->rx_buff_pool[pool].free_map[free_index] = index; 395 396 mb(); 397 398 atomic_dec(&(adapter->rx_buff_pool[pool].available)); 399 } 400 401 /* get the current buffer on the rx queue */ 402 static inline struct sk_buff *ibmveth_rxq_get_buffer(struct ibmveth_adapter *adapter) 403 { 404 u64 correlator = adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator; 405 unsigned int pool = correlator >> 32; 406 unsigned int index = correlator & 0xffffffffUL; 407 408 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS); 409 BUG_ON(index >= adapter->rx_buff_pool[pool].size); 410 411 return adapter->rx_buff_pool[pool].skbuff[index]; 412 } 413 414 /* recycle the current buffer on the rx queue */ 415 static int ibmveth_rxq_recycle_buffer(struct ibmveth_adapter *adapter) 416 { 417 u32 q_index = adapter->rx_queue.index; 418 u64 correlator = adapter->rx_queue.queue_addr[q_index].correlator; 419 unsigned int pool = correlator >> 32; 420 unsigned int index = correlator & 0xffffffffUL; 421 union ibmveth_buf_desc desc; 422 unsigned long lpar_rc; 423 int ret = 1; 424 425 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS); 426 BUG_ON(index >= adapter->rx_buff_pool[pool].size); 427 428 if (!adapter->rx_buff_pool[pool].active) { 429 ibmveth_rxq_harvest_buffer(adapter); 430 ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[pool]); 431 goto out; 432 } 433 434 desc.fields.flags_len = IBMVETH_BUF_VALID | 435 adapter->rx_buff_pool[pool].buff_size; 436 desc.fields.address = adapter->rx_buff_pool[pool].dma_addr[index]; 437 438 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc); 439 440 if (lpar_rc != H_SUCCESS) { 441 netdev_dbg(adapter->netdev, "h_add_logical_lan_buffer failed " 442 "during recycle rc=%ld", lpar_rc); 443 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator); 444 ret = 0; 445 } 446 447 if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) { 448 adapter->rx_queue.index = 0; 449 adapter->rx_queue.toggle = !adapter->rx_queue.toggle; 450 } 451 452 out: 453 return ret; 454 } 455 456 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter) 457 { 458 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator); 459 460 if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) { 461 adapter->rx_queue.index = 0; 462 adapter->rx_queue.toggle = !adapter->rx_queue.toggle; 463 } 464 } 465 466 static void ibmveth_free_tx_ltb(struct ibmveth_adapter *adapter, int idx) 467 { 468 dma_unmap_single(&adapter->vdev->dev, adapter->tx_ltb_dma[idx], 469 adapter->tx_ltb_size, DMA_TO_DEVICE); 470 kfree(adapter->tx_ltb_ptr[idx]); 471 adapter->tx_ltb_ptr[idx] = NULL; 472 } 473 474 static int ibmveth_allocate_tx_ltb(struct ibmveth_adapter *adapter, int idx) 475 { 476 adapter->tx_ltb_ptr[idx] = kzalloc(adapter->tx_ltb_size, 477 GFP_KERNEL); 478 if (!adapter->tx_ltb_ptr[idx]) { 479 netdev_err(adapter->netdev, 480 "unable to allocate tx long term buffer\n"); 481 return -ENOMEM; 482 } 483 adapter->tx_ltb_dma[idx] = dma_map_single(&adapter->vdev->dev, 484 adapter->tx_ltb_ptr[idx], 485 adapter->tx_ltb_size, 486 DMA_TO_DEVICE); 487 if (dma_mapping_error(&adapter->vdev->dev, adapter->tx_ltb_dma[idx])) { 488 netdev_err(adapter->netdev, 489 "unable to DMA map tx long term buffer\n"); 490 kfree(adapter->tx_ltb_ptr[idx]); 491 adapter->tx_ltb_ptr[idx] = NULL; 492 return -ENOMEM; 493 } 494 495 return 0; 496 } 497 498 static int ibmveth_register_logical_lan(struct ibmveth_adapter *adapter, 499 union ibmveth_buf_desc rxq_desc, u64 mac_address) 500 { 501 int rc, try_again = 1; 502 503 /* 504 * After a kexec the adapter will still be open, so our attempt to 505 * open it will fail. So if we get a failure we free the adapter and 506 * try again, but only once. 507 */ 508 retry: 509 rc = h_register_logical_lan(adapter->vdev->unit_address, 510 adapter->buffer_list_dma, rxq_desc.desc, 511 adapter->filter_list_dma, mac_address); 512 513 if (rc != H_SUCCESS && try_again) { 514 do { 515 rc = h_free_logical_lan(adapter->vdev->unit_address); 516 } while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY)); 517 518 try_again = 0; 519 goto retry; 520 } 521 522 return rc; 523 } 524 525 static int ibmveth_open(struct net_device *netdev) 526 { 527 struct ibmveth_adapter *adapter = netdev_priv(netdev); 528 u64 mac_address; 529 int rxq_entries = 1; 530 unsigned long lpar_rc; 531 int rc; 532 union ibmveth_buf_desc rxq_desc; 533 int i; 534 struct device *dev; 535 536 netdev_dbg(netdev, "open starting\n"); 537 538 napi_enable(&adapter->napi); 539 540 for(i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) 541 rxq_entries += adapter->rx_buff_pool[i].size; 542 543 rc = -ENOMEM; 544 adapter->buffer_list_addr = (void*) get_zeroed_page(GFP_KERNEL); 545 if (!adapter->buffer_list_addr) { 546 netdev_err(netdev, "unable to allocate list pages\n"); 547 goto out; 548 } 549 550 adapter->filter_list_addr = (void*) get_zeroed_page(GFP_KERNEL); 551 if (!adapter->filter_list_addr) { 552 netdev_err(netdev, "unable to allocate filter pages\n"); 553 goto out_free_buffer_list; 554 } 555 556 dev = &adapter->vdev->dev; 557 558 adapter->rx_queue.queue_len = sizeof(struct ibmveth_rx_q_entry) * 559 rxq_entries; 560 adapter->rx_queue.queue_addr = 561 dma_alloc_coherent(dev, adapter->rx_queue.queue_len, 562 &adapter->rx_queue.queue_dma, GFP_KERNEL); 563 if (!adapter->rx_queue.queue_addr) 564 goto out_free_filter_list; 565 566 adapter->buffer_list_dma = dma_map_single(dev, 567 adapter->buffer_list_addr, 4096, DMA_BIDIRECTIONAL); 568 if (dma_mapping_error(dev, adapter->buffer_list_dma)) { 569 netdev_err(netdev, "unable to map buffer list pages\n"); 570 goto out_free_queue_mem; 571 } 572 573 adapter->filter_list_dma = dma_map_single(dev, 574 adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL); 575 if (dma_mapping_error(dev, adapter->filter_list_dma)) { 576 netdev_err(netdev, "unable to map filter list pages\n"); 577 goto out_unmap_buffer_list; 578 } 579 580 for (i = 0; i < netdev->real_num_tx_queues; i++) { 581 if (ibmveth_allocate_tx_ltb(adapter, i)) 582 goto out_free_tx_ltb; 583 } 584 585 adapter->rx_queue.index = 0; 586 adapter->rx_queue.num_slots = rxq_entries; 587 adapter->rx_queue.toggle = 1; 588 589 mac_address = ether_addr_to_u64(netdev->dev_addr); 590 591 rxq_desc.fields.flags_len = IBMVETH_BUF_VALID | 592 adapter->rx_queue.queue_len; 593 rxq_desc.fields.address = adapter->rx_queue.queue_dma; 594 595 netdev_dbg(netdev, "buffer list @ 0x%p\n", adapter->buffer_list_addr); 596 netdev_dbg(netdev, "filter list @ 0x%p\n", adapter->filter_list_addr); 597 netdev_dbg(netdev, "receive q @ 0x%p\n", adapter->rx_queue.queue_addr); 598 599 h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE); 600 601 lpar_rc = ibmveth_register_logical_lan(adapter, rxq_desc, mac_address); 602 603 if (lpar_rc != H_SUCCESS) { 604 netdev_err(netdev, "h_register_logical_lan failed with %ld\n", 605 lpar_rc); 606 netdev_err(netdev, "buffer TCE:0x%llx filter TCE:0x%llx rxq " 607 "desc:0x%llx MAC:0x%llx\n", 608 adapter->buffer_list_dma, 609 adapter->filter_list_dma, 610 rxq_desc.desc, 611 mac_address); 612 rc = -ENONET; 613 goto out_unmap_filter_list; 614 } 615 616 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) { 617 if (!adapter->rx_buff_pool[i].active) 618 continue; 619 if (ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[i])) { 620 netdev_err(netdev, "unable to alloc pool\n"); 621 adapter->rx_buff_pool[i].active = 0; 622 rc = -ENOMEM; 623 goto out_free_buffer_pools; 624 } 625 } 626 627 netdev_dbg(netdev, "registering irq 0x%x\n", netdev->irq); 628 rc = request_irq(netdev->irq, ibmveth_interrupt, 0, netdev->name, 629 netdev); 630 if (rc != 0) { 631 netdev_err(netdev, "unable to request irq 0x%x, rc %d\n", 632 netdev->irq, rc); 633 do { 634 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address); 635 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY)); 636 637 goto out_free_buffer_pools; 638 } 639 640 rc = -ENOMEM; 641 642 netdev_dbg(netdev, "initial replenish cycle\n"); 643 ibmveth_interrupt(netdev->irq, netdev); 644 645 netif_tx_start_all_queues(netdev); 646 647 netdev_dbg(netdev, "open complete\n"); 648 649 return 0; 650 651 out_free_buffer_pools: 652 while (--i >= 0) { 653 if (adapter->rx_buff_pool[i].active) 654 ibmveth_free_buffer_pool(adapter, 655 &adapter->rx_buff_pool[i]); 656 } 657 out_unmap_filter_list: 658 dma_unmap_single(dev, adapter->filter_list_dma, 4096, 659 DMA_BIDIRECTIONAL); 660 661 out_free_tx_ltb: 662 while (--i >= 0) { 663 ibmveth_free_tx_ltb(adapter, i); 664 } 665 666 out_unmap_buffer_list: 667 dma_unmap_single(dev, adapter->buffer_list_dma, 4096, 668 DMA_BIDIRECTIONAL); 669 out_free_queue_mem: 670 dma_free_coherent(dev, adapter->rx_queue.queue_len, 671 adapter->rx_queue.queue_addr, 672 adapter->rx_queue.queue_dma); 673 out_free_filter_list: 674 free_page((unsigned long)adapter->filter_list_addr); 675 out_free_buffer_list: 676 free_page((unsigned long)adapter->buffer_list_addr); 677 out: 678 napi_disable(&adapter->napi); 679 return rc; 680 } 681 682 static int ibmveth_close(struct net_device *netdev) 683 { 684 struct ibmveth_adapter *adapter = netdev_priv(netdev); 685 struct device *dev = &adapter->vdev->dev; 686 long lpar_rc; 687 int i; 688 689 netdev_dbg(netdev, "close starting\n"); 690 691 napi_disable(&adapter->napi); 692 693 netif_tx_stop_all_queues(netdev); 694 695 h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE); 696 697 do { 698 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address); 699 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY)); 700 701 if (lpar_rc != H_SUCCESS) { 702 netdev_err(netdev, "h_free_logical_lan failed with %lx, " 703 "continuing with close\n", lpar_rc); 704 } 705 706 free_irq(netdev->irq, netdev); 707 708 ibmveth_update_rx_no_buffer(adapter); 709 710 dma_unmap_single(dev, adapter->buffer_list_dma, 4096, 711 DMA_BIDIRECTIONAL); 712 free_page((unsigned long)adapter->buffer_list_addr); 713 714 dma_unmap_single(dev, adapter->filter_list_dma, 4096, 715 DMA_BIDIRECTIONAL); 716 free_page((unsigned long)adapter->filter_list_addr); 717 718 dma_free_coherent(dev, adapter->rx_queue.queue_len, 719 adapter->rx_queue.queue_addr, 720 adapter->rx_queue.queue_dma); 721 722 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) 723 if (adapter->rx_buff_pool[i].active) 724 ibmveth_free_buffer_pool(adapter, 725 &adapter->rx_buff_pool[i]); 726 727 for (i = 0; i < netdev->real_num_tx_queues; i++) 728 ibmveth_free_tx_ltb(adapter, i); 729 730 netdev_dbg(netdev, "close complete\n"); 731 732 return 0; 733 } 734 735 static int ibmveth_set_link_ksettings(struct net_device *dev, 736 const struct ethtool_link_ksettings *cmd) 737 { 738 struct ibmveth_adapter *adapter = netdev_priv(dev); 739 740 return ethtool_virtdev_set_link_ksettings(dev, cmd, 741 &adapter->speed, 742 &adapter->duplex); 743 } 744 745 static int ibmveth_get_link_ksettings(struct net_device *dev, 746 struct ethtool_link_ksettings *cmd) 747 { 748 struct ibmveth_adapter *adapter = netdev_priv(dev); 749 750 cmd->base.speed = adapter->speed; 751 cmd->base.duplex = adapter->duplex; 752 cmd->base.port = PORT_OTHER; 753 754 return 0; 755 } 756 757 static void ibmveth_init_link_settings(struct net_device *dev) 758 { 759 struct ibmveth_adapter *adapter = netdev_priv(dev); 760 761 adapter->speed = SPEED_1000; 762 adapter->duplex = DUPLEX_FULL; 763 } 764 765 static void netdev_get_drvinfo(struct net_device *dev, 766 struct ethtool_drvinfo *info) 767 { 768 strscpy(info->driver, ibmveth_driver_name, sizeof(info->driver)); 769 strscpy(info->version, ibmveth_driver_version, sizeof(info->version)); 770 } 771 772 static netdev_features_t ibmveth_fix_features(struct net_device *dev, 773 netdev_features_t features) 774 { 775 /* 776 * Since the ibmveth firmware interface does not have the 777 * concept of separate tx/rx checksum offload enable, if rx 778 * checksum is disabled we also have to disable tx checksum 779 * offload. Once we disable rx checksum offload, we are no 780 * longer allowed to send tx buffers that are not properly 781 * checksummed. 782 */ 783 784 if (!(features & NETIF_F_RXCSUM)) 785 features &= ~NETIF_F_CSUM_MASK; 786 787 return features; 788 } 789 790 static int ibmveth_set_csum_offload(struct net_device *dev, u32 data) 791 { 792 struct ibmveth_adapter *adapter = netdev_priv(dev); 793 unsigned long set_attr, clr_attr, ret_attr; 794 unsigned long set_attr6, clr_attr6; 795 long ret, ret4, ret6; 796 int rc1 = 0, rc2 = 0; 797 int restart = 0; 798 799 if (netif_running(dev)) { 800 restart = 1; 801 ibmveth_close(dev); 802 } 803 804 set_attr = 0; 805 clr_attr = 0; 806 set_attr6 = 0; 807 clr_attr6 = 0; 808 809 if (data) { 810 set_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM; 811 set_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM; 812 } else { 813 clr_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM; 814 clr_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM; 815 } 816 817 ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr); 818 819 if (ret == H_SUCCESS && 820 (ret_attr & IBMVETH_ILLAN_PADDED_PKT_CSUM)) { 821 ret4 = h_illan_attributes(adapter->vdev->unit_address, clr_attr, 822 set_attr, &ret_attr); 823 824 if (ret4 != H_SUCCESS) { 825 netdev_err(dev, "unable to change IPv4 checksum " 826 "offload settings. %d rc=%ld\n", 827 data, ret4); 828 829 h_illan_attributes(adapter->vdev->unit_address, 830 set_attr, clr_attr, &ret_attr); 831 832 if (data == 1) 833 dev->features &= ~NETIF_F_IP_CSUM; 834 835 } else { 836 adapter->fw_ipv4_csum_support = data; 837 } 838 839 ret6 = h_illan_attributes(adapter->vdev->unit_address, 840 clr_attr6, set_attr6, &ret_attr); 841 842 if (ret6 != H_SUCCESS) { 843 netdev_err(dev, "unable to change IPv6 checksum " 844 "offload settings. %d rc=%ld\n", 845 data, ret6); 846 847 h_illan_attributes(adapter->vdev->unit_address, 848 set_attr6, clr_attr6, &ret_attr); 849 850 if (data == 1) 851 dev->features &= ~NETIF_F_IPV6_CSUM; 852 853 } else 854 adapter->fw_ipv6_csum_support = data; 855 856 if (ret4 == H_SUCCESS || ret6 == H_SUCCESS) 857 adapter->rx_csum = data; 858 else 859 rc1 = -EIO; 860 } else { 861 rc1 = -EIO; 862 netdev_err(dev, "unable to change checksum offload settings." 863 " %d rc=%ld ret_attr=%lx\n", data, ret, 864 ret_attr); 865 } 866 867 if (restart) 868 rc2 = ibmveth_open(dev); 869 870 return rc1 ? rc1 : rc2; 871 } 872 873 static int ibmveth_set_tso(struct net_device *dev, u32 data) 874 { 875 struct ibmveth_adapter *adapter = netdev_priv(dev); 876 unsigned long set_attr, clr_attr, ret_attr; 877 long ret1, ret2; 878 int rc1 = 0, rc2 = 0; 879 int restart = 0; 880 881 if (netif_running(dev)) { 882 restart = 1; 883 ibmveth_close(dev); 884 } 885 886 set_attr = 0; 887 clr_attr = 0; 888 889 if (data) 890 set_attr = IBMVETH_ILLAN_LRG_SR_ENABLED; 891 else 892 clr_attr = IBMVETH_ILLAN_LRG_SR_ENABLED; 893 894 ret1 = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr); 895 896 if (ret1 == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_LRG_SND_SUPPORT) && 897 !old_large_send) { 898 ret2 = h_illan_attributes(adapter->vdev->unit_address, clr_attr, 899 set_attr, &ret_attr); 900 901 if (ret2 != H_SUCCESS) { 902 netdev_err(dev, "unable to change tso settings. %d rc=%ld\n", 903 data, ret2); 904 905 h_illan_attributes(adapter->vdev->unit_address, 906 set_attr, clr_attr, &ret_attr); 907 908 if (data == 1) 909 dev->features &= ~(NETIF_F_TSO | NETIF_F_TSO6); 910 rc1 = -EIO; 911 912 } else { 913 adapter->fw_large_send_support = data; 914 adapter->large_send = data; 915 } 916 } else { 917 /* Older firmware version of large send offload does not 918 * support tcp6/ipv6 919 */ 920 if (data == 1) { 921 dev->features &= ~NETIF_F_TSO6; 922 netdev_info(dev, "TSO feature requires all partitions to have updated driver"); 923 } 924 adapter->large_send = data; 925 } 926 927 if (restart) 928 rc2 = ibmveth_open(dev); 929 930 return rc1 ? rc1 : rc2; 931 } 932 933 static int ibmveth_set_features(struct net_device *dev, 934 netdev_features_t features) 935 { 936 struct ibmveth_adapter *adapter = netdev_priv(dev); 937 int rx_csum = !!(features & NETIF_F_RXCSUM); 938 int large_send = !!(features & (NETIF_F_TSO | NETIF_F_TSO6)); 939 int rc1 = 0, rc2 = 0; 940 941 if (rx_csum != adapter->rx_csum) { 942 rc1 = ibmveth_set_csum_offload(dev, rx_csum); 943 if (rc1 && !adapter->rx_csum) 944 dev->features = 945 features & ~(NETIF_F_CSUM_MASK | 946 NETIF_F_RXCSUM); 947 } 948 949 if (large_send != adapter->large_send) { 950 rc2 = ibmveth_set_tso(dev, large_send); 951 if (rc2 && !adapter->large_send) 952 dev->features = 953 features & ~(NETIF_F_TSO | NETIF_F_TSO6); 954 } 955 956 return rc1 ? rc1 : rc2; 957 } 958 959 static void ibmveth_get_strings(struct net_device *dev, u32 stringset, u8 *data) 960 { 961 int i; 962 963 if (stringset != ETH_SS_STATS) 964 return; 965 966 for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++, data += ETH_GSTRING_LEN) 967 memcpy(data, ibmveth_stats[i].name, ETH_GSTRING_LEN); 968 } 969 970 static int ibmveth_get_sset_count(struct net_device *dev, int sset) 971 { 972 switch (sset) { 973 case ETH_SS_STATS: 974 return ARRAY_SIZE(ibmveth_stats); 975 default: 976 return -EOPNOTSUPP; 977 } 978 } 979 980 static void ibmveth_get_ethtool_stats(struct net_device *dev, 981 struct ethtool_stats *stats, u64 *data) 982 { 983 int i; 984 struct ibmveth_adapter *adapter = netdev_priv(dev); 985 986 for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++) 987 data[i] = IBMVETH_GET_STAT(adapter, ibmveth_stats[i].offset); 988 } 989 990 static void ibmveth_get_channels(struct net_device *netdev, 991 struct ethtool_channels *channels) 992 { 993 channels->max_tx = ibmveth_real_max_tx_queues(); 994 channels->tx_count = netdev->real_num_tx_queues; 995 996 channels->max_rx = netdev->real_num_rx_queues; 997 channels->rx_count = netdev->real_num_rx_queues; 998 } 999 1000 static int ibmveth_set_channels(struct net_device *netdev, 1001 struct ethtool_channels *channels) 1002 { 1003 struct ibmveth_adapter *adapter = netdev_priv(netdev); 1004 unsigned int old = netdev->real_num_tx_queues, 1005 goal = channels->tx_count; 1006 int rc, i; 1007 1008 /* If ndo_open has not been called yet then don't allocate, just set 1009 * desired netdev_queue's and return 1010 */ 1011 if (!(netdev->flags & IFF_UP)) 1012 return netif_set_real_num_tx_queues(netdev, goal); 1013 1014 /* We have IBMVETH_MAX_QUEUES netdev_queue's allocated 1015 * but we may need to alloc/free the ltb's. 1016 */ 1017 netif_tx_stop_all_queues(netdev); 1018 1019 /* Allocate any queue that we need */ 1020 for (i = old; i < goal; i++) { 1021 if (adapter->tx_ltb_ptr[i]) 1022 continue; 1023 1024 rc = ibmveth_allocate_tx_ltb(adapter, i); 1025 if (!rc) 1026 continue; 1027 1028 /* if something goes wrong, free everything we just allocated */ 1029 netdev_err(netdev, "Failed to allocate more tx queues, returning to %d queues\n", 1030 old); 1031 goal = old; 1032 old = i; 1033 break; 1034 } 1035 rc = netif_set_real_num_tx_queues(netdev, goal); 1036 if (rc) { 1037 netdev_err(netdev, "Failed to set real tx queues, returning to %d queues\n", 1038 old); 1039 goal = old; 1040 old = i; 1041 } 1042 /* Free any that are no longer needed */ 1043 for (i = old; i > goal; i--) { 1044 if (adapter->tx_ltb_ptr[i - 1]) 1045 ibmveth_free_tx_ltb(adapter, i - 1); 1046 } 1047 1048 netif_tx_wake_all_queues(netdev); 1049 1050 return rc; 1051 } 1052 1053 static const struct ethtool_ops netdev_ethtool_ops = { 1054 .get_drvinfo = netdev_get_drvinfo, 1055 .get_link = ethtool_op_get_link, 1056 .get_strings = ibmveth_get_strings, 1057 .get_sset_count = ibmveth_get_sset_count, 1058 .get_ethtool_stats = ibmveth_get_ethtool_stats, 1059 .get_link_ksettings = ibmveth_get_link_ksettings, 1060 .set_link_ksettings = ibmveth_set_link_ksettings, 1061 .get_channels = ibmveth_get_channels, 1062 .set_channels = ibmveth_set_channels 1063 }; 1064 1065 static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 1066 { 1067 return -EOPNOTSUPP; 1068 } 1069 1070 static int ibmveth_send(struct ibmveth_adapter *adapter, 1071 unsigned long desc, unsigned long mss) 1072 { 1073 unsigned long correlator; 1074 unsigned int retry_count; 1075 unsigned long ret; 1076 1077 /* 1078 * The retry count sets a maximum for the number of broadcast and 1079 * multicast destinations within the system. 1080 */ 1081 retry_count = 1024; 1082 correlator = 0; 1083 do { 1084 ret = h_send_logical_lan(adapter->vdev->unit_address, desc, 1085 correlator, &correlator, mss, 1086 adapter->fw_large_send_support); 1087 } while ((ret == H_BUSY) && (retry_count--)); 1088 1089 if (ret != H_SUCCESS && ret != H_DROPPED) { 1090 netdev_err(adapter->netdev, "tx: h_send_logical_lan failed " 1091 "with rc=%ld\n", ret); 1092 return 1; 1093 } 1094 1095 return 0; 1096 } 1097 1098 static int ibmveth_is_packet_unsupported(struct sk_buff *skb, 1099 struct net_device *netdev) 1100 { 1101 struct ethhdr *ether_header; 1102 int ret = 0; 1103 1104 ether_header = eth_hdr(skb); 1105 1106 if (ether_addr_equal(ether_header->h_dest, netdev->dev_addr)) { 1107 netdev_dbg(netdev, "veth doesn't support loopback packets, dropping packet.\n"); 1108 netdev->stats.tx_dropped++; 1109 ret = -EOPNOTSUPP; 1110 } 1111 1112 return ret; 1113 } 1114 1115 static netdev_tx_t ibmveth_start_xmit(struct sk_buff *skb, 1116 struct net_device *netdev) 1117 { 1118 struct ibmveth_adapter *adapter = netdev_priv(netdev); 1119 unsigned int desc_flags, total_bytes; 1120 union ibmveth_buf_desc desc; 1121 int i, queue_num = skb_get_queue_mapping(skb); 1122 unsigned long mss = 0; 1123 1124 if (ibmveth_is_packet_unsupported(skb, netdev)) 1125 goto out; 1126 /* veth can't checksum offload UDP */ 1127 if (skb->ip_summed == CHECKSUM_PARTIAL && 1128 ((skb->protocol == htons(ETH_P_IP) && 1129 ip_hdr(skb)->protocol != IPPROTO_TCP) || 1130 (skb->protocol == htons(ETH_P_IPV6) && 1131 ipv6_hdr(skb)->nexthdr != IPPROTO_TCP)) && 1132 skb_checksum_help(skb)) { 1133 1134 netdev_err(netdev, "tx: failed to checksum packet\n"); 1135 netdev->stats.tx_dropped++; 1136 goto out; 1137 } 1138 1139 desc_flags = IBMVETH_BUF_VALID; 1140 1141 if (skb->ip_summed == CHECKSUM_PARTIAL) { 1142 unsigned char *buf = skb_transport_header(skb) + 1143 skb->csum_offset; 1144 1145 desc_flags |= (IBMVETH_BUF_NO_CSUM | IBMVETH_BUF_CSUM_GOOD); 1146 1147 /* Need to zero out the checksum */ 1148 buf[0] = 0; 1149 buf[1] = 0; 1150 1151 if (skb_is_gso(skb) && adapter->fw_large_send_support) 1152 desc_flags |= IBMVETH_BUF_LRG_SND; 1153 } 1154 1155 if (skb->ip_summed == CHECKSUM_PARTIAL && skb_is_gso(skb)) { 1156 if (adapter->fw_large_send_support) { 1157 mss = (unsigned long)skb_shinfo(skb)->gso_size; 1158 adapter->tx_large_packets++; 1159 } else if (!skb_is_gso_v6(skb)) { 1160 /* Put -1 in the IP checksum to tell phyp it 1161 * is a largesend packet. Put the mss in 1162 * the TCP checksum. 1163 */ 1164 ip_hdr(skb)->check = 0xffff; 1165 tcp_hdr(skb)->check = 1166 cpu_to_be16(skb_shinfo(skb)->gso_size); 1167 adapter->tx_large_packets++; 1168 } 1169 } 1170 1171 /* Copy header into mapped buffer */ 1172 if (unlikely(skb->len > adapter->tx_ltb_size)) { 1173 netdev_err(adapter->netdev, "tx: packet size (%u) exceeds ltb (%u)\n", 1174 skb->len, adapter->tx_ltb_size); 1175 netdev->stats.tx_dropped++; 1176 goto out; 1177 } 1178 memcpy(adapter->tx_ltb_ptr[queue_num], skb->data, skb_headlen(skb)); 1179 total_bytes = skb_headlen(skb); 1180 /* Copy frags into mapped buffers */ 1181 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1182 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 1183 1184 memcpy(adapter->tx_ltb_ptr[queue_num] + total_bytes, 1185 skb_frag_address_safe(frag), skb_frag_size(frag)); 1186 total_bytes += skb_frag_size(frag); 1187 } 1188 1189 if (unlikely(total_bytes != skb->len)) { 1190 netdev_err(adapter->netdev, "tx: incorrect packet len copied into ltb (%u != %u)\n", 1191 skb->len, total_bytes); 1192 netdev->stats.tx_dropped++; 1193 goto out; 1194 } 1195 desc.fields.flags_len = desc_flags | skb->len; 1196 desc.fields.address = adapter->tx_ltb_dma[queue_num]; 1197 /* finish writing to long_term_buff before VIOS accessing it */ 1198 dma_wmb(); 1199 1200 if (ibmveth_send(adapter, desc.desc, mss)) { 1201 adapter->tx_send_failed++; 1202 netdev->stats.tx_dropped++; 1203 } else { 1204 netdev->stats.tx_packets++; 1205 netdev->stats.tx_bytes += skb->len; 1206 } 1207 1208 out: 1209 dev_consume_skb_any(skb); 1210 return NETDEV_TX_OK; 1211 1212 1213 } 1214 1215 static void ibmveth_rx_mss_helper(struct sk_buff *skb, u16 mss, int lrg_pkt) 1216 { 1217 struct tcphdr *tcph; 1218 int offset = 0; 1219 int hdr_len; 1220 1221 /* only TCP packets will be aggregated */ 1222 if (skb->protocol == htons(ETH_P_IP)) { 1223 struct iphdr *iph = (struct iphdr *)skb->data; 1224 1225 if (iph->protocol == IPPROTO_TCP) { 1226 offset = iph->ihl * 4; 1227 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; 1228 } else { 1229 return; 1230 } 1231 } else if (skb->protocol == htons(ETH_P_IPV6)) { 1232 struct ipv6hdr *iph6 = (struct ipv6hdr *)skb->data; 1233 1234 if (iph6->nexthdr == IPPROTO_TCP) { 1235 offset = sizeof(struct ipv6hdr); 1236 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; 1237 } else { 1238 return; 1239 } 1240 } else { 1241 return; 1242 } 1243 /* if mss is not set through Large Packet bit/mss in rx buffer, 1244 * expect that the mss will be written to the tcp header checksum. 1245 */ 1246 tcph = (struct tcphdr *)(skb->data + offset); 1247 if (lrg_pkt) { 1248 skb_shinfo(skb)->gso_size = mss; 1249 } else if (offset) { 1250 skb_shinfo(skb)->gso_size = ntohs(tcph->check); 1251 tcph->check = 0; 1252 } 1253 1254 if (skb_shinfo(skb)->gso_size) { 1255 hdr_len = offset + tcph->doff * 4; 1256 skb_shinfo(skb)->gso_segs = 1257 DIV_ROUND_UP(skb->len - hdr_len, 1258 skb_shinfo(skb)->gso_size); 1259 } 1260 } 1261 1262 static void ibmveth_rx_csum_helper(struct sk_buff *skb, 1263 struct ibmveth_adapter *adapter) 1264 { 1265 struct iphdr *iph = NULL; 1266 struct ipv6hdr *iph6 = NULL; 1267 __be16 skb_proto = 0; 1268 u16 iphlen = 0; 1269 u16 iph_proto = 0; 1270 u16 tcphdrlen = 0; 1271 1272 skb_proto = be16_to_cpu(skb->protocol); 1273 1274 if (skb_proto == ETH_P_IP) { 1275 iph = (struct iphdr *)skb->data; 1276 1277 /* If the IP checksum is not offloaded and if the packet 1278 * is large send, the checksum must be rebuilt. 1279 */ 1280 if (iph->check == 0xffff) { 1281 iph->check = 0; 1282 iph->check = ip_fast_csum((unsigned char *)iph, 1283 iph->ihl); 1284 } 1285 1286 iphlen = iph->ihl * 4; 1287 iph_proto = iph->protocol; 1288 } else if (skb_proto == ETH_P_IPV6) { 1289 iph6 = (struct ipv6hdr *)skb->data; 1290 iphlen = sizeof(struct ipv6hdr); 1291 iph_proto = iph6->nexthdr; 1292 } 1293 1294 /* When CSO is enabled the TCP checksum may have be set to NULL by 1295 * the sender given that we zeroed out TCP checksum field in 1296 * transmit path (refer ibmveth_start_xmit routine). In this case set 1297 * up CHECKSUM_PARTIAL. If the packet is forwarded, the checksum will 1298 * then be recalculated by the destination NIC (CSO must be enabled 1299 * on the destination NIC). 1300 * 1301 * In an OVS environment, when a flow is not cached, specifically for a 1302 * new TCP connection, the first packet information is passed up to 1303 * the user space for finding a flow. During this process, OVS computes 1304 * checksum on the first packet when CHECKSUM_PARTIAL flag is set. 1305 * 1306 * So, re-compute TCP pseudo header checksum. 1307 */ 1308 1309 if (iph_proto == IPPROTO_TCP) { 1310 struct tcphdr *tcph = (struct tcphdr *)(skb->data + iphlen); 1311 1312 if (tcph->check == 0x0000) { 1313 /* Recompute TCP pseudo header checksum */ 1314 tcphdrlen = skb->len - iphlen; 1315 if (skb_proto == ETH_P_IP) 1316 tcph->check = 1317 ~csum_tcpudp_magic(iph->saddr, 1318 iph->daddr, tcphdrlen, iph_proto, 0); 1319 else if (skb_proto == ETH_P_IPV6) 1320 tcph->check = 1321 ~csum_ipv6_magic(&iph6->saddr, 1322 &iph6->daddr, tcphdrlen, iph_proto, 0); 1323 /* Setup SKB fields for checksum offload */ 1324 skb_partial_csum_set(skb, iphlen, 1325 offsetof(struct tcphdr, check)); 1326 skb_reset_network_header(skb); 1327 } 1328 } 1329 } 1330 1331 static int ibmveth_poll(struct napi_struct *napi, int budget) 1332 { 1333 struct ibmveth_adapter *adapter = 1334 container_of(napi, struct ibmveth_adapter, napi); 1335 struct net_device *netdev = adapter->netdev; 1336 int frames_processed = 0; 1337 unsigned long lpar_rc; 1338 u16 mss = 0; 1339 1340 while (frames_processed < budget) { 1341 if (!ibmveth_rxq_pending_buffer(adapter)) 1342 break; 1343 1344 smp_rmb(); 1345 if (!ibmveth_rxq_buffer_valid(adapter)) { 1346 wmb(); /* suggested by larson1 */ 1347 adapter->rx_invalid_buffer++; 1348 netdev_dbg(netdev, "recycling invalid buffer\n"); 1349 ibmveth_rxq_recycle_buffer(adapter); 1350 } else { 1351 struct sk_buff *skb, *new_skb; 1352 int length = ibmveth_rxq_frame_length(adapter); 1353 int offset = ibmveth_rxq_frame_offset(adapter); 1354 int csum_good = ibmveth_rxq_csum_good(adapter); 1355 int lrg_pkt = ibmveth_rxq_large_packet(adapter); 1356 __sum16 iph_check = 0; 1357 1358 skb = ibmveth_rxq_get_buffer(adapter); 1359 1360 /* if the large packet bit is set in the rx queue 1361 * descriptor, the mss will be written by PHYP eight 1362 * bytes from the start of the rx buffer, which is 1363 * skb->data at this stage 1364 */ 1365 if (lrg_pkt) { 1366 __be64 *rxmss = (__be64 *)(skb->data + 8); 1367 1368 mss = (u16)be64_to_cpu(*rxmss); 1369 } 1370 1371 new_skb = NULL; 1372 if (length < rx_copybreak) 1373 new_skb = netdev_alloc_skb(netdev, length); 1374 1375 if (new_skb) { 1376 skb_copy_to_linear_data(new_skb, 1377 skb->data + offset, 1378 length); 1379 if (rx_flush) 1380 ibmveth_flush_buffer(skb->data, 1381 length + offset); 1382 if (!ibmveth_rxq_recycle_buffer(adapter)) 1383 kfree_skb(skb); 1384 skb = new_skb; 1385 } else { 1386 ibmveth_rxq_harvest_buffer(adapter); 1387 skb_reserve(skb, offset); 1388 } 1389 1390 skb_put(skb, length); 1391 skb->protocol = eth_type_trans(skb, netdev); 1392 1393 /* PHYP without PLSO support places a -1 in the ip 1394 * checksum for large send frames. 1395 */ 1396 if (skb->protocol == cpu_to_be16(ETH_P_IP)) { 1397 struct iphdr *iph = (struct iphdr *)skb->data; 1398 1399 iph_check = iph->check; 1400 } 1401 1402 if ((length > netdev->mtu + ETH_HLEN) || 1403 lrg_pkt || iph_check == 0xffff) { 1404 ibmveth_rx_mss_helper(skb, mss, lrg_pkt); 1405 adapter->rx_large_packets++; 1406 } 1407 1408 if (csum_good) { 1409 skb->ip_summed = CHECKSUM_UNNECESSARY; 1410 ibmveth_rx_csum_helper(skb, adapter); 1411 } 1412 1413 napi_gro_receive(napi, skb); /* send it up */ 1414 1415 netdev->stats.rx_packets++; 1416 netdev->stats.rx_bytes += length; 1417 frames_processed++; 1418 } 1419 } 1420 1421 ibmveth_replenish_task(adapter); 1422 1423 if (frames_processed < budget) { 1424 napi_complete_done(napi, frames_processed); 1425 1426 /* We think we are done - reenable interrupts, 1427 * then check once more to make sure we are done. 1428 */ 1429 lpar_rc = h_vio_signal(adapter->vdev->unit_address, 1430 VIO_IRQ_ENABLE); 1431 1432 BUG_ON(lpar_rc != H_SUCCESS); 1433 1434 if (ibmveth_rxq_pending_buffer(adapter) && 1435 napi_reschedule(napi)) { 1436 lpar_rc = h_vio_signal(adapter->vdev->unit_address, 1437 VIO_IRQ_DISABLE); 1438 } 1439 } 1440 1441 return frames_processed; 1442 } 1443 1444 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance) 1445 { 1446 struct net_device *netdev = dev_instance; 1447 struct ibmveth_adapter *adapter = netdev_priv(netdev); 1448 unsigned long lpar_rc; 1449 1450 if (napi_schedule_prep(&adapter->napi)) { 1451 lpar_rc = h_vio_signal(adapter->vdev->unit_address, 1452 VIO_IRQ_DISABLE); 1453 BUG_ON(lpar_rc != H_SUCCESS); 1454 __napi_schedule(&adapter->napi); 1455 } 1456 return IRQ_HANDLED; 1457 } 1458 1459 static void ibmveth_set_multicast_list(struct net_device *netdev) 1460 { 1461 struct ibmveth_adapter *adapter = netdev_priv(netdev); 1462 unsigned long lpar_rc; 1463 1464 if ((netdev->flags & IFF_PROMISC) || 1465 (netdev_mc_count(netdev) > adapter->mcastFilterSize)) { 1466 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address, 1467 IbmVethMcastEnableRecv | 1468 IbmVethMcastDisableFiltering, 1469 0); 1470 if (lpar_rc != H_SUCCESS) { 1471 netdev_err(netdev, "h_multicast_ctrl rc=%ld when " 1472 "entering promisc mode\n", lpar_rc); 1473 } 1474 } else { 1475 struct netdev_hw_addr *ha; 1476 /* clear the filter table & disable filtering */ 1477 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address, 1478 IbmVethMcastEnableRecv | 1479 IbmVethMcastDisableFiltering | 1480 IbmVethMcastClearFilterTable, 1481 0); 1482 if (lpar_rc != H_SUCCESS) { 1483 netdev_err(netdev, "h_multicast_ctrl rc=%ld when " 1484 "attempting to clear filter table\n", 1485 lpar_rc); 1486 } 1487 /* add the addresses to the filter table */ 1488 netdev_for_each_mc_addr(ha, netdev) { 1489 /* add the multicast address to the filter table */ 1490 u64 mcast_addr; 1491 mcast_addr = ether_addr_to_u64(ha->addr); 1492 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address, 1493 IbmVethMcastAddFilter, 1494 mcast_addr); 1495 if (lpar_rc != H_SUCCESS) { 1496 netdev_err(netdev, "h_multicast_ctrl rc=%ld " 1497 "when adding an entry to the filter " 1498 "table\n", lpar_rc); 1499 } 1500 } 1501 1502 /* re-enable filtering */ 1503 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address, 1504 IbmVethMcastEnableFiltering, 1505 0); 1506 if (lpar_rc != H_SUCCESS) { 1507 netdev_err(netdev, "h_multicast_ctrl rc=%ld when " 1508 "enabling filtering\n", lpar_rc); 1509 } 1510 } 1511 } 1512 1513 static int ibmveth_change_mtu(struct net_device *dev, int new_mtu) 1514 { 1515 struct ibmveth_adapter *adapter = netdev_priv(dev); 1516 struct vio_dev *viodev = adapter->vdev; 1517 int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH; 1518 int i, rc; 1519 int need_restart = 0; 1520 1521 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) 1522 if (new_mtu_oh <= adapter->rx_buff_pool[i].buff_size) 1523 break; 1524 1525 if (i == IBMVETH_NUM_BUFF_POOLS) 1526 return -EINVAL; 1527 1528 /* Deactivate all the buffer pools so that the next loop can activate 1529 only the buffer pools necessary to hold the new MTU */ 1530 if (netif_running(adapter->netdev)) { 1531 need_restart = 1; 1532 ibmveth_close(adapter->netdev); 1533 } 1534 1535 /* Look for an active buffer pool that can hold the new MTU */ 1536 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) { 1537 adapter->rx_buff_pool[i].active = 1; 1538 1539 if (new_mtu_oh <= adapter->rx_buff_pool[i].buff_size) { 1540 dev->mtu = new_mtu; 1541 vio_cmo_set_dev_desired(viodev, 1542 ibmveth_get_desired_dma 1543 (viodev)); 1544 if (need_restart) { 1545 return ibmveth_open(adapter->netdev); 1546 } 1547 return 0; 1548 } 1549 } 1550 1551 if (need_restart && (rc = ibmveth_open(adapter->netdev))) 1552 return rc; 1553 1554 return -EINVAL; 1555 } 1556 1557 #ifdef CONFIG_NET_POLL_CONTROLLER 1558 static void ibmveth_poll_controller(struct net_device *dev) 1559 { 1560 ibmveth_replenish_task(netdev_priv(dev)); 1561 ibmveth_interrupt(dev->irq, dev); 1562 } 1563 #endif 1564 1565 /** 1566 * ibmveth_get_desired_dma - Calculate IO memory desired by the driver 1567 * 1568 * @vdev: struct vio_dev for the device whose desired IO mem is to be returned 1569 * 1570 * Return value: 1571 * Number of bytes of IO data the driver will need to perform well. 1572 */ 1573 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev) 1574 { 1575 struct net_device *netdev = dev_get_drvdata(&vdev->dev); 1576 struct ibmveth_adapter *adapter; 1577 struct iommu_table *tbl; 1578 unsigned long ret; 1579 int i; 1580 int rxqentries = 1; 1581 1582 tbl = get_iommu_table_base(&vdev->dev); 1583 1584 /* netdev inits at probe time along with the structures we need below*/ 1585 if (netdev == NULL) 1586 return IOMMU_PAGE_ALIGN(IBMVETH_IO_ENTITLEMENT_DEFAULT, tbl); 1587 1588 adapter = netdev_priv(netdev); 1589 1590 ret = IBMVETH_BUFF_LIST_SIZE + IBMVETH_FILT_LIST_SIZE; 1591 ret += IOMMU_PAGE_ALIGN(netdev->mtu, tbl); 1592 /* add size of mapped tx buffers */ 1593 ret += IOMMU_PAGE_ALIGN(IBMVETH_MAX_TX_BUF_SIZE, tbl); 1594 1595 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) { 1596 /* add the size of the active receive buffers */ 1597 if (adapter->rx_buff_pool[i].active) 1598 ret += 1599 adapter->rx_buff_pool[i].size * 1600 IOMMU_PAGE_ALIGN(adapter->rx_buff_pool[i]. 1601 buff_size, tbl); 1602 rxqentries += adapter->rx_buff_pool[i].size; 1603 } 1604 /* add the size of the receive queue entries */ 1605 ret += IOMMU_PAGE_ALIGN( 1606 rxqentries * sizeof(struct ibmveth_rx_q_entry), tbl); 1607 1608 return ret; 1609 } 1610 1611 static int ibmveth_set_mac_addr(struct net_device *dev, void *p) 1612 { 1613 struct ibmveth_adapter *adapter = netdev_priv(dev); 1614 struct sockaddr *addr = p; 1615 u64 mac_address; 1616 int rc; 1617 1618 if (!is_valid_ether_addr(addr->sa_data)) 1619 return -EADDRNOTAVAIL; 1620 1621 mac_address = ether_addr_to_u64(addr->sa_data); 1622 rc = h_change_logical_lan_mac(adapter->vdev->unit_address, mac_address); 1623 if (rc) { 1624 netdev_err(adapter->netdev, "h_change_logical_lan_mac failed with rc=%d\n", rc); 1625 return rc; 1626 } 1627 1628 eth_hw_addr_set(dev, addr->sa_data); 1629 1630 return 0; 1631 } 1632 1633 static const struct net_device_ops ibmveth_netdev_ops = { 1634 .ndo_open = ibmveth_open, 1635 .ndo_stop = ibmveth_close, 1636 .ndo_start_xmit = ibmveth_start_xmit, 1637 .ndo_set_rx_mode = ibmveth_set_multicast_list, 1638 .ndo_eth_ioctl = ibmveth_ioctl, 1639 .ndo_change_mtu = ibmveth_change_mtu, 1640 .ndo_fix_features = ibmveth_fix_features, 1641 .ndo_set_features = ibmveth_set_features, 1642 .ndo_validate_addr = eth_validate_addr, 1643 .ndo_set_mac_address = ibmveth_set_mac_addr, 1644 #ifdef CONFIG_NET_POLL_CONTROLLER 1645 .ndo_poll_controller = ibmveth_poll_controller, 1646 #endif 1647 }; 1648 1649 static int ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id) 1650 { 1651 int rc, i, mac_len; 1652 struct net_device *netdev; 1653 struct ibmveth_adapter *adapter; 1654 unsigned char *mac_addr_p; 1655 __be32 *mcastFilterSize_p; 1656 long ret; 1657 unsigned long ret_attr; 1658 1659 dev_dbg(&dev->dev, "entering ibmveth_probe for UA 0x%x\n", 1660 dev->unit_address); 1661 1662 mac_addr_p = (unsigned char *)vio_get_attribute(dev, VETH_MAC_ADDR, 1663 &mac_len); 1664 if (!mac_addr_p) { 1665 dev_err(&dev->dev, "Can't find VETH_MAC_ADDR attribute\n"); 1666 return -EINVAL; 1667 } 1668 /* Workaround for old/broken pHyp */ 1669 if (mac_len == 8) 1670 mac_addr_p += 2; 1671 else if (mac_len != 6) { 1672 dev_err(&dev->dev, "VETH_MAC_ADDR attribute wrong len %d\n", 1673 mac_len); 1674 return -EINVAL; 1675 } 1676 1677 mcastFilterSize_p = (__be32 *)vio_get_attribute(dev, 1678 VETH_MCAST_FILTER_SIZE, 1679 NULL); 1680 if (!mcastFilterSize_p) { 1681 dev_err(&dev->dev, "Can't find VETH_MCAST_FILTER_SIZE " 1682 "attribute\n"); 1683 return -EINVAL; 1684 } 1685 1686 netdev = alloc_etherdev_mqs(sizeof(struct ibmveth_adapter), IBMVETH_MAX_QUEUES, 1); 1687 if (!netdev) 1688 return -ENOMEM; 1689 1690 adapter = netdev_priv(netdev); 1691 dev_set_drvdata(&dev->dev, netdev); 1692 1693 adapter->vdev = dev; 1694 adapter->netdev = netdev; 1695 adapter->mcastFilterSize = be32_to_cpu(*mcastFilterSize_p); 1696 ibmveth_init_link_settings(netdev); 1697 1698 netif_napi_add_weight(netdev, &adapter->napi, ibmveth_poll, 16); 1699 1700 netdev->irq = dev->irq; 1701 netdev->netdev_ops = &ibmveth_netdev_ops; 1702 netdev->ethtool_ops = &netdev_ethtool_ops; 1703 SET_NETDEV_DEV(netdev, &dev->dev); 1704 netdev->hw_features = NETIF_F_SG; 1705 if (vio_get_attribute(dev, "ibm,illan-options", NULL) != NULL) { 1706 netdev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM | 1707 NETIF_F_RXCSUM; 1708 } 1709 1710 netdev->features |= netdev->hw_features; 1711 1712 ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr); 1713 1714 /* If running older firmware, TSO should not be enabled by default */ 1715 if (ret == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_LRG_SND_SUPPORT) && 1716 !old_large_send) { 1717 netdev->hw_features |= NETIF_F_TSO | NETIF_F_TSO6; 1718 netdev->features |= netdev->hw_features; 1719 } else { 1720 netdev->hw_features |= NETIF_F_TSO; 1721 } 1722 1723 adapter->is_active_trunk = false; 1724 if (ret == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_ACTIVE_TRUNK)) { 1725 adapter->is_active_trunk = true; 1726 netdev->hw_features |= NETIF_F_FRAGLIST; 1727 netdev->features |= NETIF_F_FRAGLIST; 1728 } 1729 1730 netdev->min_mtu = IBMVETH_MIN_MTU; 1731 netdev->max_mtu = ETH_MAX_MTU - IBMVETH_BUFF_OH; 1732 1733 eth_hw_addr_set(netdev, mac_addr_p); 1734 1735 if (firmware_has_feature(FW_FEATURE_CMO)) 1736 memcpy(pool_count, pool_count_cmo, sizeof(pool_count)); 1737 1738 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) { 1739 struct kobject *kobj = &adapter->rx_buff_pool[i].kobj; 1740 int error; 1741 1742 ibmveth_init_buffer_pool(&adapter->rx_buff_pool[i], i, 1743 pool_count[i], pool_size[i], 1744 pool_active[i]); 1745 error = kobject_init_and_add(kobj, &ktype_veth_pool, 1746 &dev->dev.kobj, "pool%d", i); 1747 if (!error) 1748 kobject_uevent(kobj, KOBJ_ADD); 1749 } 1750 1751 rc = netif_set_real_num_tx_queues(netdev, min(num_online_cpus(), 1752 IBMVETH_DEFAULT_QUEUES)); 1753 if (rc) { 1754 netdev_dbg(netdev, "failed to set number of tx queues rc=%d\n", 1755 rc); 1756 free_netdev(netdev); 1757 return rc; 1758 } 1759 adapter->tx_ltb_size = PAGE_ALIGN(IBMVETH_MAX_TX_BUF_SIZE); 1760 for (i = 0; i < IBMVETH_MAX_QUEUES; i++) 1761 adapter->tx_ltb_ptr[i] = NULL; 1762 1763 netdev_dbg(netdev, "adapter @ 0x%p\n", adapter); 1764 netdev_dbg(netdev, "registering netdev...\n"); 1765 1766 ibmveth_set_features(netdev, netdev->features); 1767 1768 rc = register_netdev(netdev); 1769 1770 if (rc) { 1771 netdev_dbg(netdev, "failed to register netdev rc=%d\n", rc); 1772 free_netdev(netdev); 1773 return rc; 1774 } 1775 1776 netdev_dbg(netdev, "registered\n"); 1777 1778 return 0; 1779 } 1780 1781 static void ibmveth_remove(struct vio_dev *dev) 1782 { 1783 struct net_device *netdev = dev_get_drvdata(&dev->dev); 1784 struct ibmveth_adapter *adapter = netdev_priv(netdev); 1785 int i; 1786 1787 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) 1788 kobject_put(&adapter->rx_buff_pool[i].kobj); 1789 1790 unregister_netdev(netdev); 1791 1792 free_netdev(netdev); 1793 dev_set_drvdata(&dev->dev, NULL); 1794 } 1795 1796 static struct attribute veth_active_attr; 1797 static struct attribute veth_num_attr; 1798 static struct attribute veth_size_attr; 1799 1800 static ssize_t veth_pool_show(struct kobject *kobj, 1801 struct attribute *attr, char *buf) 1802 { 1803 struct ibmveth_buff_pool *pool = container_of(kobj, 1804 struct ibmveth_buff_pool, 1805 kobj); 1806 1807 if (attr == &veth_active_attr) 1808 return sprintf(buf, "%d\n", pool->active); 1809 else if (attr == &veth_num_attr) 1810 return sprintf(buf, "%d\n", pool->size); 1811 else if (attr == &veth_size_attr) 1812 return sprintf(buf, "%d\n", pool->buff_size); 1813 return 0; 1814 } 1815 1816 static ssize_t veth_pool_store(struct kobject *kobj, struct attribute *attr, 1817 const char *buf, size_t count) 1818 { 1819 struct ibmveth_buff_pool *pool = container_of(kobj, 1820 struct ibmveth_buff_pool, 1821 kobj); 1822 struct net_device *netdev = dev_get_drvdata(kobj_to_dev(kobj->parent)); 1823 struct ibmveth_adapter *adapter = netdev_priv(netdev); 1824 long value = simple_strtol(buf, NULL, 10); 1825 long rc; 1826 1827 if (attr == &veth_active_attr) { 1828 if (value && !pool->active) { 1829 if (netif_running(netdev)) { 1830 if (ibmveth_alloc_buffer_pool(pool)) { 1831 netdev_err(netdev, 1832 "unable to alloc pool\n"); 1833 return -ENOMEM; 1834 } 1835 pool->active = 1; 1836 ibmveth_close(netdev); 1837 if ((rc = ibmveth_open(netdev))) 1838 return rc; 1839 } else { 1840 pool->active = 1; 1841 } 1842 } else if (!value && pool->active) { 1843 int mtu = netdev->mtu + IBMVETH_BUFF_OH; 1844 int i; 1845 /* Make sure there is a buffer pool with buffers that 1846 can hold a packet of the size of the MTU */ 1847 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) { 1848 if (pool == &adapter->rx_buff_pool[i]) 1849 continue; 1850 if (!adapter->rx_buff_pool[i].active) 1851 continue; 1852 if (mtu <= adapter->rx_buff_pool[i].buff_size) 1853 break; 1854 } 1855 1856 if (i == IBMVETH_NUM_BUFF_POOLS) { 1857 netdev_err(netdev, "no active pool >= MTU\n"); 1858 return -EPERM; 1859 } 1860 1861 if (netif_running(netdev)) { 1862 ibmveth_close(netdev); 1863 pool->active = 0; 1864 if ((rc = ibmveth_open(netdev))) 1865 return rc; 1866 } 1867 pool->active = 0; 1868 } 1869 } else if (attr == &veth_num_attr) { 1870 if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT) { 1871 return -EINVAL; 1872 } else { 1873 if (netif_running(netdev)) { 1874 ibmveth_close(netdev); 1875 pool->size = value; 1876 if ((rc = ibmveth_open(netdev))) 1877 return rc; 1878 } else { 1879 pool->size = value; 1880 } 1881 } 1882 } else if (attr == &veth_size_attr) { 1883 if (value <= IBMVETH_BUFF_OH || value > IBMVETH_MAX_BUF_SIZE) { 1884 return -EINVAL; 1885 } else { 1886 if (netif_running(netdev)) { 1887 ibmveth_close(netdev); 1888 pool->buff_size = value; 1889 if ((rc = ibmveth_open(netdev))) 1890 return rc; 1891 } else { 1892 pool->buff_size = value; 1893 } 1894 } 1895 } 1896 1897 /* kick the interrupt handler to allocate/deallocate pools */ 1898 ibmveth_interrupt(netdev->irq, netdev); 1899 return count; 1900 } 1901 1902 1903 #define ATTR(_name, _mode) \ 1904 struct attribute veth_##_name##_attr = { \ 1905 .name = __stringify(_name), .mode = _mode, \ 1906 }; 1907 1908 static ATTR(active, 0644); 1909 static ATTR(num, 0644); 1910 static ATTR(size, 0644); 1911 1912 static struct attribute *veth_pool_attrs[] = { 1913 &veth_active_attr, 1914 &veth_num_attr, 1915 &veth_size_attr, 1916 NULL, 1917 }; 1918 ATTRIBUTE_GROUPS(veth_pool); 1919 1920 static const struct sysfs_ops veth_pool_ops = { 1921 .show = veth_pool_show, 1922 .store = veth_pool_store, 1923 }; 1924 1925 static struct kobj_type ktype_veth_pool = { 1926 .release = NULL, 1927 .sysfs_ops = &veth_pool_ops, 1928 .default_groups = veth_pool_groups, 1929 }; 1930 1931 static int ibmveth_resume(struct device *dev) 1932 { 1933 struct net_device *netdev = dev_get_drvdata(dev); 1934 ibmveth_interrupt(netdev->irq, netdev); 1935 return 0; 1936 } 1937 1938 static const struct vio_device_id ibmveth_device_table[] = { 1939 { "network", "IBM,l-lan"}, 1940 { "", "" } 1941 }; 1942 MODULE_DEVICE_TABLE(vio, ibmveth_device_table); 1943 1944 static const struct dev_pm_ops ibmveth_pm_ops = { 1945 .resume = ibmveth_resume 1946 }; 1947 1948 static struct vio_driver ibmveth_driver = { 1949 .id_table = ibmveth_device_table, 1950 .probe = ibmveth_probe, 1951 .remove = ibmveth_remove, 1952 .get_desired_dma = ibmveth_get_desired_dma, 1953 .name = ibmveth_driver_name, 1954 .pm = &ibmveth_pm_ops, 1955 }; 1956 1957 static int __init ibmveth_module_init(void) 1958 { 1959 printk(KERN_DEBUG "%s: %s %s\n", ibmveth_driver_name, 1960 ibmveth_driver_string, ibmveth_driver_version); 1961 1962 return vio_register_driver(&ibmveth_driver); 1963 } 1964 1965 static void __exit ibmveth_module_exit(void) 1966 { 1967 vio_unregister_driver(&ibmveth_driver); 1968 } 1969 1970 module_init(ibmveth_module_init); 1971 module_exit(ibmveth_module_exit); 1972