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