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("dcbfl %0,%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 if (!adapter->pool_config) 694 netif_tx_stop_all_queues(netdev); 695 696 h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE); 697 698 do { 699 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address); 700 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY)); 701 702 if (lpar_rc != H_SUCCESS) { 703 netdev_err(netdev, "h_free_logical_lan failed with %lx, " 704 "continuing with close\n", lpar_rc); 705 } 706 707 free_irq(netdev->irq, netdev); 708 709 ibmveth_update_rx_no_buffer(adapter); 710 711 dma_unmap_single(dev, adapter->buffer_list_dma, 4096, 712 DMA_BIDIRECTIONAL); 713 free_page((unsigned long)adapter->buffer_list_addr); 714 715 dma_unmap_single(dev, adapter->filter_list_dma, 4096, 716 DMA_BIDIRECTIONAL); 717 free_page((unsigned long)adapter->filter_list_addr); 718 719 dma_free_coherent(dev, adapter->rx_queue.queue_len, 720 adapter->rx_queue.queue_addr, 721 adapter->rx_queue.queue_dma); 722 723 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) 724 if (adapter->rx_buff_pool[i].active) 725 ibmveth_free_buffer_pool(adapter, 726 &adapter->rx_buff_pool[i]); 727 728 for (i = 0; i < netdev->real_num_tx_queues; i++) 729 ibmveth_free_tx_ltb(adapter, i); 730 731 netdev_dbg(netdev, "close complete\n"); 732 733 return 0; 734 } 735 736 static int ibmveth_set_link_ksettings(struct net_device *dev, 737 const struct ethtool_link_ksettings *cmd) 738 { 739 struct ibmveth_adapter *adapter = netdev_priv(dev); 740 741 return ethtool_virtdev_set_link_ksettings(dev, cmd, 742 &adapter->speed, 743 &adapter->duplex); 744 } 745 746 static int ibmveth_get_link_ksettings(struct net_device *dev, 747 struct ethtool_link_ksettings *cmd) 748 { 749 struct ibmveth_adapter *adapter = netdev_priv(dev); 750 751 cmd->base.speed = adapter->speed; 752 cmd->base.duplex = adapter->duplex; 753 cmd->base.port = PORT_OTHER; 754 755 return 0; 756 } 757 758 static void ibmveth_init_link_settings(struct net_device *dev) 759 { 760 struct ibmveth_adapter *adapter = netdev_priv(dev); 761 762 adapter->speed = SPEED_1000; 763 adapter->duplex = DUPLEX_FULL; 764 } 765 766 static void netdev_get_drvinfo(struct net_device *dev, 767 struct ethtool_drvinfo *info) 768 { 769 strscpy(info->driver, ibmveth_driver_name, sizeof(info->driver)); 770 strscpy(info->version, ibmveth_driver_version, sizeof(info->version)); 771 } 772 773 static netdev_features_t ibmveth_fix_features(struct net_device *dev, 774 netdev_features_t features) 775 { 776 /* 777 * Since the ibmveth firmware interface does not have the 778 * concept of separate tx/rx checksum offload enable, if rx 779 * checksum is disabled we also have to disable tx checksum 780 * offload. Once we disable rx checksum offload, we are no 781 * longer allowed to send tx buffers that are not properly 782 * checksummed. 783 */ 784 785 if (!(features & NETIF_F_RXCSUM)) 786 features &= ~NETIF_F_CSUM_MASK; 787 788 return features; 789 } 790 791 static int ibmveth_set_csum_offload(struct net_device *dev, u32 data) 792 { 793 struct ibmveth_adapter *adapter = netdev_priv(dev); 794 unsigned long set_attr, clr_attr, ret_attr; 795 unsigned long set_attr6, clr_attr6; 796 long ret, ret4, ret6; 797 int rc1 = 0, rc2 = 0; 798 int restart = 0; 799 800 if (netif_running(dev)) { 801 restart = 1; 802 adapter->pool_config = 1; 803 ibmveth_close(dev); 804 adapter->pool_config = 0; 805 } 806 807 set_attr = 0; 808 clr_attr = 0; 809 set_attr6 = 0; 810 clr_attr6 = 0; 811 812 if (data) { 813 set_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM; 814 set_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM; 815 } else { 816 clr_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM; 817 clr_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM; 818 } 819 820 ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr); 821 822 if (ret == H_SUCCESS && 823 (ret_attr & IBMVETH_ILLAN_PADDED_PKT_CSUM)) { 824 ret4 = h_illan_attributes(adapter->vdev->unit_address, clr_attr, 825 set_attr, &ret_attr); 826 827 if (ret4 != H_SUCCESS) { 828 netdev_err(dev, "unable to change IPv4 checksum " 829 "offload settings. %d rc=%ld\n", 830 data, ret4); 831 832 h_illan_attributes(adapter->vdev->unit_address, 833 set_attr, clr_attr, &ret_attr); 834 835 if (data == 1) 836 dev->features &= ~NETIF_F_IP_CSUM; 837 838 } else { 839 adapter->fw_ipv4_csum_support = data; 840 } 841 842 ret6 = h_illan_attributes(adapter->vdev->unit_address, 843 clr_attr6, set_attr6, &ret_attr); 844 845 if (ret6 != H_SUCCESS) { 846 netdev_err(dev, "unable to change IPv6 checksum " 847 "offload settings. %d rc=%ld\n", 848 data, ret6); 849 850 h_illan_attributes(adapter->vdev->unit_address, 851 set_attr6, clr_attr6, &ret_attr); 852 853 if (data == 1) 854 dev->features &= ~NETIF_F_IPV6_CSUM; 855 856 } else 857 adapter->fw_ipv6_csum_support = data; 858 859 if (ret4 == H_SUCCESS || ret6 == H_SUCCESS) 860 adapter->rx_csum = data; 861 else 862 rc1 = -EIO; 863 } else { 864 rc1 = -EIO; 865 netdev_err(dev, "unable to change checksum offload settings." 866 " %d rc=%ld ret_attr=%lx\n", data, ret, 867 ret_attr); 868 } 869 870 if (restart) 871 rc2 = ibmveth_open(dev); 872 873 return rc1 ? rc1 : rc2; 874 } 875 876 static int ibmveth_set_tso(struct net_device *dev, u32 data) 877 { 878 struct ibmveth_adapter *adapter = netdev_priv(dev); 879 unsigned long set_attr, clr_attr, ret_attr; 880 long ret1, ret2; 881 int rc1 = 0, rc2 = 0; 882 int restart = 0; 883 884 if (netif_running(dev)) { 885 restart = 1; 886 adapter->pool_config = 1; 887 ibmveth_close(dev); 888 adapter->pool_config = 0; 889 } 890 891 set_attr = 0; 892 clr_attr = 0; 893 894 if (data) 895 set_attr = IBMVETH_ILLAN_LRG_SR_ENABLED; 896 else 897 clr_attr = IBMVETH_ILLAN_LRG_SR_ENABLED; 898 899 ret1 = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr); 900 901 if (ret1 == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_LRG_SND_SUPPORT) && 902 !old_large_send) { 903 ret2 = h_illan_attributes(adapter->vdev->unit_address, clr_attr, 904 set_attr, &ret_attr); 905 906 if (ret2 != H_SUCCESS) { 907 netdev_err(dev, "unable to change tso settings. %d rc=%ld\n", 908 data, ret2); 909 910 h_illan_attributes(adapter->vdev->unit_address, 911 set_attr, clr_attr, &ret_attr); 912 913 if (data == 1) 914 dev->features &= ~(NETIF_F_TSO | NETIF_F_TSO6); 915 rc1 = -EIO; 916 917 } else { 918 adapter->fw_large_send_support = data; 919 adapter->large_send = data; 920 } 921 } else { 922 /* Older firmware version of large send offload does not 923 * support tcp6/ipv6 924 */ 925 if (data == 1) { 926 dev->features &= ~NETIF_F_TSO6; 927 netdev_info(dev, "TSO feature requires all partitions to have updated driver"); 928 } 929 adapter->large_send = data; 930 } 931 932 if (restart) 933 rc2 = ibmveth_open(dev); 934 935 return rc1 ? rc1 : rc2; 936 } 937 938 static int ibmveth_set_features(struct net_device *dev, 939 netdev_features_t features) 940 { 941 struct ibmveth_adapter *adapter = netdev_priv(dev); 942 int rx_csum = !!(features & NETIF_F_RXCSUM); 943 int large_send = !!(features & (NETIF_F_TSO | NETIF_F_TSO6)); 944 int rc1 = 0, rc2 = 0; 945 946 if (rx_csum != adapter->rx_csum) { 947 rc1 = ibmveth_set_csum_offload(dev, rx_csum); 948 if (rc1 && !adapter->rx_csum) 949 dev->features = 950 features & ~(NETIF_F_CSUM_MASK | 951 NETIF_F_RXCSUM); 952 } 953 954 if (large_send != adapter->large_send) { 955 rc2 = ibmveth_set_tso(dev, large_send); 956 if (rc2 && !adapter->large_send) 957 dev->features = 958 features & ~(NETIF_F_TSO | NETIF_F_TSO6); 959 } 960 961 return rc1 ? rc1 : rc2; 962 } 963 964 static void ibmveth_get_strings(struct net_device *dev, u32 stringset, u8 *data) 965 { 966 int i; 967 968 if (stringset != ETH_SS_STATS) 969 return; 970 971 for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++, data += ETH_GSTRING_LEN) 972 memcpy(data, ibmveth_stats[i].name, ETH_GSTRING_LEN); 973 } 974 975 static int ibmveth_get_sset_count(struct net_device *dev, int sset) 976 { 977 switch (sset) { 978 case ETH_SS_STATS: 979 return ARRAY_SIZE(ibmveth_stats); 980 default: 981 return -EOPNOTSUPP; 982 } 983 } 984 985 static void ibmveth_get_ethtool_stats(struct net_device *dev, 986 struct ethtool_stats *stats, u64 *data) 987 { 988 int i; 989 struct ibmveth_adapter *adapter = netdev_priv(dev); 990 991 for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++) 992 data[i] = IBMVETH_GET_STAT(adapter, ibmveth_stats[i].offset); 993 } 994 995 static void ibmveth_get_channels(struct net_device *netdev, 996 struct ethtool_channels *channels) 997 { 998 channels->max_tx = ibmveth_real_max_tx_queues(); 999 channels->tx_count = netdev->real_num_tx_queues; 1000 1001 channels->max_rx = netdev->real_num_rx_queues; 1002 channels->rx_count = netdev->real_num_rx_queues; 1003 } 1004 1005 static int ibmveth_set_channels(struct net_device *netdev, 1006 struct ethtool_channels *channels) 1007 { 1008 struct ibmveth_adapter *adapter = netdev_priv(netdev); 1009 unsigned int old = netdev->real_num_tx_queues, 1010 goal = channels->tx_count; 1011 int rc, i; 1012 1013 /* If ndo_open has not been called yet then don't allocate, just set 1014 * desired netdev_queue's and return 1015 */ 1016 if (!(netdev->flags & IFF_UP)) 1017 return netif_set_real_num_tx_queues(netdev, goal); 1018 1019 /* We have IBMVETH_MAX_QUEUES netdev_queue's allocated 1020 * but we may need to alloc/free the ltb's. 1021 */ 1022 netif_tx_stop_all_queues(netdev); 1023 1024 /* Allocate any queue that we need */ 1025 for (i = old; i < goal; i++) { 1026 if (adapter->tx_ltb_ptr[i]) 1027 continue; 1028 1029 rc = ibmveth_allocate_tx_ltb(adapter, i); 1030 if (!rc) 1031 continue; 1032 1033 /* if something goes wrong, free everything we just allocated */ 1034 netdev_err(netdev, "Failed to allocate more tx queues, returning to %d queues\n", 1035 old); 1036 goal = old; 1037 old = i; 1038 break; 1039 } 1040 rc = netif_set_real_num_tx_queues(netdev, goal); 1041 if (rc) { 1042 netdev_err(netdev, "Failed to set real tx queues, returning to %d queues\n", 1043 old); 1044 goal = old; 1045 old = i; 1046 } 1047 /* Free any that are no longer needed */ 1048 for (i = old; i > goal; i--) { 1049 if (adapter->tx_ltb_ptr[i - 1]) 1050 ibmveth_free_tx_ltb(adapter, i - 1); 1051 } 1052 1053 netif_tx_wake_all_queues(netdev); 1054 1055 return rc; 1056 } 1057 1058 static const struct ethtool_ops netdev_ethtool_ops = { 1059 .get_drvinfo = netdev_get_drvinfo, 1060 .get_link = ethtool_op_get_link, 1061 .get_strings = ibmveth_get_strings, 1062 .get_sset_count = ibmveth_get_sset_count, 1063 .get_ethtool_stats = ibmveth_get_ethtool_stats, 1064 .get_link_ksettings = ibmveth_get_link_ksettings, 1065 .set_link_ksettings = ibmveth_set_link_ksettings, 1066 .get_channels = ibmveth_get_channels, 1067 .set_channels = ibmveth_set_channels 1068 }; 1069 1070 static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 1071 { 1072 return -EOPNOTSUPP; 1073 } 1074 1075 static int ibmveth_send(struct ibmveth_adapter *adapter, 1076 unsigned long desc, unsigned long mss) 1077 { 1078 unsigned long correlator; 1079 unsigned int retry_count; 1080 unsigned long ret; 1081 1082 /* 1083 * The retry count sets a maximum for the number of broadcast and 1084 * multicast destinations within the system. 1085 */ 1086 retry_count = 1024; 1087 correlator = 0; 1088 do { 1089 ret = h_send_logical_lan(adapter->vdev->unit_address, desc, 1090 correlator, &correlator, mss, 1091 adapter->fw_large_send_support); 1092 } while ((ret == H_BUSY) && (retry_count--)); 1093 1094 if (ret != H_SUCCESS && ret != H_DROPPED) { 1095 netdev_err(adapter->netdev, "tx: h_send_logical_lan failed " 1096 "with rc=%ld\n", ret); 1097 return 1; 1098 } 1099 1100 return 0; 1101 } 1102 1103 static int ibmveth_is_packet_unsupported(struct sk_buff *skb, 1104 struct net_device *netdev) 1105 { 1106 struct ethhdr *ether_header; 1107 int ret = 0; 1108 1109 ether_header = eth_hdr(skb); 1110 1111 if (ether_addr_equal(ether_header->h_dest, netdev->dev_addr)) { 1112 netdev_dbg(netdev, "veth doesn't support loopback packets, dropping packet.\n"); 1113 netdev->stats.tx_dropped++; 1114 ret = -EOPNOTSUPP; 1115 } 1116 1117 return ret; 1118 } 1119 1120 static netdev_tx_t ibmveth_start_xmit(struct sk_buff *skb, 1121 struct net_device *netdev) 1122 { 1123 struct ibmveth_adapter *adapter = netdev_priv(netdev); 1124 unsigned int desc_flags, total_bytes; 1125 union ibmveth_buf_desc desc; 1126 int i, queue_num = skb_get_queue_mapping(skb); 1127 unsigned long mss = 0; 1128 1129 if (ibmveth_is_packet_unsupported(skb, netdev)) 1130 goto out; 1131 /* veth can't checksum offload UDP */ 1132 if (skb->ip_summed == CHECKSUM_PARTIAL && 1133 ((skb->protocol == htons(ETH_P_IP) && 1134 ip_hdr(skb)->protocol != IPPROTO_TCP) || 1135 (skb->protocol == htons(ETH_P_IPV6) && 1136 ipv6_hdr(skb)->nexthdr != IPPROTO_TCP)) && 1137 skb_checksum_help(skb)) { 1138 1139 netdev_err(netdev, "tx: failed to checksum packet\n"); 1140 netdev->stats.tx_dropped++; 1141 goto out; 1142 } 1143 1144 desc_flags = IBMVETH_BUF_VALID; 1145 1146 if (skb->ip_summed == CHECKSUM_PARTIAL) { 1147 unsigned char *buf = skb_transport_header(skb) + 1148 skb->csum_offset; 1149 1150 desc_flags |= (IBMVETH_BUF_NO_CSUM | IBMVETH_BUF_CSUM_GOOD); 1151 1152 /* Need to zero out the checksum */ 1153 buf[0] = 0; 1154 buf[1] = 0; 1155 1156 if (skb_is_gso(skb) && adapter->fw_large_send_support) 1157 desc_flags |= IBMVETH_BUF_LRG_SND; 1158 } 1159 1160 if (skb->ip_summed == CHECKSUM_PARTIAL && skb_is_gso(skb)) { 1161 if (adapter->fw_large_send_support) { 1162 mss = (unsigned long)skb_shinfo(skb)->gso_size; 1163 adapter->tx_large_packets++; 1164 } else if (!skb_is_gso_v6(skb)) { 1165 /* Put -1 in the IP checksum to tell phyp it 1166 * is a largesend packet. Put the mss in 1167 * the TCP checksum. 1168 */ 1169 ip_hdr(skb)->check = 0xffff; 1170 tcp_hdr(skb)->check = 1171 cpu_to_be16(skb_shinfo(skb)->gso_size); 1172 adapter->tx_large_packets++; 1173 } 1174 } 1175 1176 /* Copy header into mapped buffer */ 1177 if (unlikely(skb->len > adapter->tx_ltb_size)) { 1178 netdev_err(adapter->netdev, "tx: packet size (%u) exceeds ltb (%u)\n", 1179 skb->len, adapter->tx_ltb_size); 1180 netdev->stats.tx_dropped++; 1181 goto out; 1182 } 1183 memcpy(adapter->tx_ltb_ptr[queue_num], skb->data, skb_headlen(skb)); 1184 total_bytes = skb_headlen(skb); 1185 /* Copy frags into mapped buffers */ 1186 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1187 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 1188 1189 memcpy(adapter->tx_ltb_ptr[queue_num] + total_bytes, 1190 skb_frag_address_safe(frag), skb_frag_size(frag)); 1191 total_bytes += skb_frag_size(frag); 1192 } 1193 1194 if (unlikely(total_bytes != skb->len)) { 1195 netdev_err(adapter->netdev, "tx: incorrect packet len copied into ltb (%u != %u)\n", 1196 skb->len, total_bytes); 1197 netdev->stats.tx_dropped++; 1198 goto out; 1199 } 1200 desc.fields.flags_len = desc_flags | skb->len; 1201 desc.fields.address = adapter->tx_ltb_dma[queue_num]; 1202 /* finish writing to long_term_buff before VIOS accessing it */ 1203 dma_wmb(); 1204 1205 if (ibmveth_send(adapter, desc.desc, mss)) { 1206 adapter->tx_send_failed++; 1207 netdev->stats.tx_dropped++; 1208 } else { 1209 netdev->stats.tx_packets++; 1210 netdev->stats.tx_bytes += skb->len; 1211 } 1212 1213 out: 1214 dev_consume_skb_any(skb); 1215 return NETDEV_TX_OK; 1216 1217 1218 } 1219 1220 static void ibmveth_rx_mss_helper(struct sk_buff *skb, u16 mss, int lrg_pkt) 1221 { 1222 struct tcphdr *tcph; 1223 int offset = 0; 1224 int hdr_len; 1225 1226 /* only TCP packets will be aggregated */ 1227 if (skb->protocol == htons(ETH_P_IP)) { 1228 struct iphdr *iph = (struct iphdr *)skb->data; 1229 1230 if (iph->protocol == IPPROTO_TCP) { 1231 offset = iph->ihl * 4; 1232 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; 1233 } else { 1234 return; 1235 } 1236 } else if (skb->protocol == htons(ETH_P_IPV6)) { 1237 struct ipv6hdr *iph6 = (struct ipv6hdr *)skb->data; 1238 1239 if (iph6->nexthdr == IPPROTO_TCP) { 1240 offset = sizeof(struct ipv6hdr); 1241 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; 1242 } else { 1243 return; 1244 } 1245 } else { 1246 return; 1247 } 1248 /* if mss is not set through Large Packet bit/mss in rx buffer, 1249 * expect that the mss will be written to the tcp header checksum. 1250 */ 1251 tcph = (struct tcphdr *)(skb->data + offset); 1252 if (lrg_pkt) { 1253 skb_shinfo(skb)->gso_size = mss; 1254 } else if (offset) { 1255 skb_shinfo(skb)->gso_size = ntohs(tcph->check); 1256 tcph->check = 0; 1257 } 1258 1259 if (skb_shinfo(skb)->gso_size) { 1260 hdr_len = offset + tcph->doff * 4; 1261 skb_shinfo(skb)->gso_segs = 1262 DIV_ROUND_UP(skb->len - hdr_len, 1263 skb_shinfo(skb)->gso_size); 1264 } 1265 } 1266 1267 static void ibmveth_rx_csum_helper(struct sk_buff *skb, 1268 struct ibmveth_adapter *adapter) 1269 { 1270 struct iphdr *iph = NULL; 1271 struct ipv6hdr *iph6 = NULL; 1272 __be16 skb_proto = 0; 1273 u16 iphlen = 0; 1274 u16 iph_proto = 0; 1275 u16 tcphdrlen = 0; 1276 1277 skb_proto = be16_to_cpu(skb->protocol); 1278 1279 if (skb_proto == ETH_P_IP) { 1280 iph = (struct iphdr *)skb->data; 1281 1282 /* If the IP checksum is not offloaded and if the packet 1283 * is large send, the checksum must be rebuilt. 1284 */ 1285 if (iph->check == 0xffff) { 1286 iph->check = 0; 1287 iph->check = ip_fast_csum((unsigned char *)iph, 1288 iph->ihl); 1289 } 1290 1291 iphlen = iph->ihl * 4; 1292 iph_proto = iph->protocol; 1293 } else if (skb_proto == ETH_P_IPV6) { 1294 iph6 = (struct ipv6hdr *)skb->data; 1295 iphlen = sizeof(struct ipv6hdr); 1296 iph_proto = iph6->nexthdr; 1297 } 1298 1299 /* When CSO is enabled the TCP checksum may have be set to NULL by 1300 * the sender given that we zeroed out TCP checksum field in 1301 * transmit path (refer ibmveth_start_xmit routine). In this case set 1302 * up CHECKSUM_PARTIAL. If the packet is forwarded, the checksum will 1303 * then be recalculated by the destination NIC (CSO must be enabled 1304 * on the destination NIC). 1305 * 1306 * In an OVS environment, when a flow is not cached, specifically for a 1307 * new TCP connection, the first packet information is passed up to 1308 * the user space for finding a flow. During this process, OVS computes 1309 * checksum on the first packet when CHECKSUM_PARTIAL flag is set. 1310 * 1311 * So, re-compute TCP pseudo header checksum when configured for 1312 * trunk mode. 1313 */ 1314 if (iph_proto == IPPROTO_TCP) { 1315 struct tcphdr *tcph = (struct tcphdr *)(skb->data + iphlen); 1316 if (tcph->check == 0x0000) { 1317 /* Recompute TCP pseudo header checksum */ 1318 if (adapter->is_active_trunk) { 1319 tcphdrlen = skb->len - iphlen; 1320 if (skb_proto == ETH_P_IP) 1321 tcph->check = 1322 ~csum_tcpudp_magic(iph->saddr, 1323 iph->daddr, tcphdrlen, iph_proto, 0); 1324 else if (skb_proto == ETH_P_IPV6) 1325 tcph->check = 1326 ~csum_ipv6_magic(&iph6->saddr, 1327 &iph6->daddr, tcphdrlen, iph_proto, 0); 1328 } 1329 /* Setup SKB fields for checksum offload */ 1330 skb_partial_csum_set(skb, iphlen, 1331 offsetof(struct tcphdr, check)); 1332 skb_reset_network_header(skb); 1333 } 1334 } 1335 } 1336 1337 static int ibmveth_poll(struct napi_struct *napi, int budget) 1338 { 1339 struct ibmveth_adapter *adapter = 1340 container_of(napi, struct ibmveth_adapter, napi); 1341 struct net_device *netdev = adapter->netdev; 1342 int frames_processed = 0; 1343 unsigned long lpar_rc; 1344 u16 mss = 0; 1345 1346 while (frames_processed < budget) { 1347 if (!ibmveth_rxq_pending_buffer(adapter)) 1348 break; 1349 1350 smp_rmb(); 1351 if (!ibmveth_rxq_buffer_valid(adapter)) { 1352 wmb(); /* suggested by larson1 */ 1353 adapter->rx_invalid_buffer++; 1354 netdev_dbg(netdev, "recycling invalid buffer\n"); 1355 ibmveth_rxq_recycle_buffer(adapter); 1356 } else { 1357 struct sk_buff *skb, *new_skb; 1358 int length = ibmveth_rxq_frame_length(adapter); 1359 int offset = ibmveth_rxq_frame_offset(adapter); 1360 int csum_good = ibmveth_rxq_csum_good(adapter); 1361 int lrg_pkt = ibmveth_rxq_large_packet(adapter); 1362 __sum16 iph_check = 0; 1363 1364 skb = ibmveth_rxq_get_buffer(adapter); 1365 1366 /* if the large packet bit is set in the rx queue 1367 * descriptor, the mss will be written by PHYP eight 1368 * bytes from the start of the rx buffer, which is 1369 * skb->data at this stage 1370 */ 1371 if (lrg_pkt) { 1372 __be64 *rxmss = (__be64 *)(skb->data + 8); 1373 1374 mss = (u16)be64_to_cpu(*rxmss); 1375 } 1376 1377 new_skb = NULL; 1378 if (length < rx_copybreak) 1379 new_skb = netdev_alloc_skb(netdev, length); 1380 1381 if (new_skb) { 1382 skb_copy_to_linear_data(new_skb, 1383 skb->data + offset, 1384 length); 1385 if (rx_flush) 1386 ibmveth_flush_buffer(skb->data, 1387 length + offset); 1388 if (!ibmveth_rxq_recycle_buffer(adapter)) 1389 kfree_skb(skb); 1390 skb = new_skb; 1391 } else { 1392 ibmveth_rxq_harvest_buffer(adapter); 1393 skb_reserve(skb, offset); 1394 } 1395 1396 skb_put(skb, length); 1397 skb->protocol = eth_type_trans(skb, netdev); 1398 1399 /* PHYP without PLSO support places a -1 in the ip 1400 * checksum for large send frames. 1401 */ 1402 if (skb->protocol == cpu_to_be16(ETH_P_IP)) { 1403 struct iphdr *iph = (struct iphdr *)skb->data; 1404 1405 iph_check = iph->check; 1406 } 1407 1408 if ((length > netdev->mtu + ETH_HLEN) || 1409 lrg_pkt || iph_check == 0xffff) { 1410 ibmveth_rx_mss_helper(skb, mss, lrg_pkt); 1411 adapter->rx_large_packets++; 1412 } 1413 1414 if (csum_good) { 1415 skb->ip_summed = CHECKSUM_UNNECESSARY; 1416 ibmveth_rx_csum_helper(skb, adapter); 1417 } 1418 1419 napi_gro_receive(napi, skb); /* send it up */ 1420 1421 netdev->stats.rx_packets++; 1422 netdev->stats.rx_bytes += length; 1423 frames_processed++; 1424 } 1425 } 1426 1427 ibmveth_replenish_task(adapter); 1428 1429 if (frames_processed < budget) { 1430 napi_complete_done(napi, frames_processed); 1431 1432 /* We think we are done - reenable interrupts, 1433 * then check once more to make sure we are done. 1434 */ 1435 lpar_rc = h_vio_signal(adapter->vdev->unit_address, 1436 VIO_IRQ_ENABLE); 1437 1438 BUG_ON(lpar_rc != H_SUCCESS); 1439 1440 if (ibmveth_rxq_pending_buffer(adapter) && 1441 napi_reschedule(napi)) { 1442 lpar_rc = h_vio_signal(adapter->vdev->unit_address, 1443 VIO_IRQ_DISABLE); 1444 } 1445 } 1446 1447 return frames_processed; 1448 } 1449 1450 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance) 1451 { 1452 struct net_device *netdev = dev_instance; 1453 struct ibmveth_adapter *adapter = netdev_priv(netdev); 1454 unsigned long lpar_rc; 1455 1456 if (napi_schedule_prep(&adapter->napi)) { 1457 lpar_rc = h_vio_signal(adapter->vdev->unit_address, 1458 VIO_IRQ_DISABLE); 1459 BUG_ON(lpar_rc != H_SUCCESS); 1460 __napi_schedule(&adapter->napi); 1461 } 1462 return IRQ_HANDLED; 1463 } 1464 1465 static void ibmveth_set_multicast_list(struct net_device *netdev) 1466 { 1467 struct ibmveth_adapter *adapter = netdev_priv(netdev); 1468 unsigned long lpar_rc; 1469 1470 if ((netdev->flags & IFF_PROMISC) || 1471 (netdev_mc_count(netdev) > adapter->mcastFilterSize)) { 1472 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address, 1473 IbmVethMcastEnableRecv | 1474 IbmVethMcastDisableFiltering, 1475 0); 1476 if (lpar_rc != H_SUCCESS) { 1477 netdev_err(netdev, "h_multicast_ctrl rc=%ld when " 1478 "entering promisc mode\n", lpar_rc); 1479 } 1480 } else { 1481 struct netdev_hw_addr *ha; 1482 /* clear the filter table & disable filtering */ 1483 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address, 1484 IbmVethMcastEnableRecv | 1485 IbmVethMcastDisableFiltering | 1486 IbmVethMcastClearFilterTable, 1487 0); 1488 if (lpar_rc != H_SUCCESS) { 1489 netdev_err(netdev, "h_multicast_ctrl rc=%ld when " 1490 "attempting to clear filter table\n", 1491 lpar_rc); 1492 } 1493 /* add the addresses to the filter table */ 1494 netdev_for_each_mc_addr(ha, netdev) { 1495 /* add the multicast address to the filter table */ 1496 u64 mcast_addr; 1497 mcast_addr = ether_addr_to_u64(ha->addr); 1498 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address, 1499 IbmVethMcastAddFilter, 1500 mcast_addr); 1501 if (lpar_rc != H_SUCCESS) { 1502 netdev_err(netdev, "h_multicast_ctrl rc=%ld " 1503 "when adding an entry to the filter " 1504 "table\n", lpar_rc); 1505 } 1506 } 1507 1508 /* re-enable filtering */ 1509 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address, 1510 IbmVethMcastEnableFiltering, 1511 0); 1512 if (lpar_rc != H_SUCCESS) { 1513 netdev_err(netdev, "h_multicast_ctrl rc=%ld when " 1514 "enabling filtering\n", lpar_rc); 1515 } 1516 } 1517 } 1518 1519 static int ibmveth_change_mtu(struct net_device *dev, int new_mtu) 1520 { 1521 struct ibmveth_adapter *adapter = netdev_priv(dev); 1522 struct vio_dev *viodev = adapter->vdev; 1523 int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH; 1524 int i, rc; 1525 int need_restart = 0; 1526 1527 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) 1528 if (new_mtu_oh <= adapter->rx_buff_pool[i].buff_size) 1529 break; 1530 1531 if (i == IBMVETH_NUM_BUFF_POOLS) 1532 return -EINVAL; 1533 1534 /* Deactivate all the buffer pools so that the next loop can activate 1535 only the buffer pools necessary to hold the new MTU */ 1536 if (netif_running(adapter->netdev)) { 1537 need_restart = 1; 1538 adapter->pool_config = 1; 1539 ibmveth_close(adapter->netdev); 1540 adapter->pool_config = 0; 1541 } 1542 1543 /* Look for an active buffer pool that can hold the new MTU */ 1544 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) { 1545 adapter->rx_buff_pool[i].active = 1; 1546 1547 if (new_mtu_oh <= adapter->rx_buff_pool[i].buff_size) { 1548 dev->mtu = new_mtu; 1549 vio_cmo_set_dev_desired(viodev, 1550 ibmveth_get_desired_dma 1551 (viodev)); 1552 if (need_restart) { 1553 return ibmveth_open(adapter->netdev); 1554 } 1555 return 0; 1556 } 1557 } 1558 1559 if (need_restart && (rc = ibmveth_open(adapter->netdev))) 1560 return rc; 1561 1562 return -EINVAL; 1563 } 1564 1565 #ifdef CONFIG_NET_POLL_CONTROLLER 1566 static void ibmveth_poll_controller(struct net_device *dev) 1567 { 1568 ibmveth_replenish_task(netdev_priv(dev)); 1569 ibmveth_interrupt(dev->irq, dev); 1570 } 1571 #endif 1572 1573 /** 1574 * ibmveth_get_desired_dma - Calculate IO memory desired by the driver 1575 * 1576 * @vdev: struct vio_dev for the device whose desired IO mem is to be returned 1577 * 1578 * Return value: 1579 * Number of bytes of IO data the driver will need to perform well. 1580 */ 1581 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev) 1582 { 1583 struct net_device *netdev = dev_get_drvdata(&vdev->dev); 1584 struct ibmveth_adapter *adapter; 1585 struct iommu_table *tbl; 1586 unsigned long ret; 1587 int i; 1588 int rxqentries = 1; 1589 1590 tbl = get_iommu_table_base(&vdev->dev); 1591 1592 /* netdev inits at probe time along with the structures we need below*/ 1593 if (netdev == NULL) 1594 return IOMMU_PAGE_ALIGN(IBMVETH_IO_ENTITLEMENT_DEFAULT, tbl); 1595 1596 adapter = netdev_priv(netdev); 1597 1598 ret = IBMVETH_BUFF_LIST_SIZE + IBMVETH_FILT_LIST_SIZE; 1599 ret += IOMMU_PAGE_ALIGN(netdev->mtu, tbl); 1600 /* add size of mapped tx buffers */ 1601 ret += IOMMU_PAGE_ALIGN(IBMVETH_MAX_TX_BUF_SIZE, tbl); 1602 1603 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) { 1604 /* add the size of the active receive buffers */ 1605 if (adapter->rx_buff_pool[i].active) 1606 ret += 1607 adapter->rx_buff_pool[i].size * 1608 IOMMU_PAGE_ALIGN(adapter->rx_buff_pool[i]. 1609 buff_size, tbl); 1610 rxqentries += adapter->rx_buff_pool[i].size; 1611 } 1612 /* add the size of the receive queue entries */ 1613 ret += IOMMU_PAGE_ALIGN( 1614 rxqentries * sizeof(struct ibmveth_rx_q_entry), tbl); 1615 1616 return ret; 1617 } 1618 1619 static int ibmveth_set_mac_addr(struct net_device *dev, void *p) 1620 { 1621 struct ibmveth_adapter *adapter = netdev_priv(dev); 1622 struct sockaddr *addr = p; 1623 u64 mac_address; 1624 int rc; 1625 1626 if (!is_valid_ether_addr(addr->sa_data)) 1627 return -EADDRNOTAVAIL; 1628 1629 mac_address = ether_addr_to_u64(addr->sa_data); 1630 rc = h_change_logical_lan_mac(adapter->vdev->unit_address, mac_address); 1631 if (rc) { 1632 netdev_err(adapter->netdev, "h_change_logical_lan_mac failed with rc=%d\n", rc); 1633 return rc; 1634 } 1635 1636 eth_hw_addr_set(dev, addr->sa_data); 1637 1638 return 0; 1639 } 1640 1641 static const struct net_device_ops ibmveth_netdev_ops = { 1642 .ndo_open = ibmveth_open, 1643 .ndo_stop = ibmveth_close, 1644 .ndo_start_xmit = ibmveth_start_xmit, 1645 .ndo_set_rx_mode = ibmveth_set_multicast_list, 1646 .ndo_eth_ioctl = ibmveth_ioctl, 1647 .ndo_change_mtu = ibmveth_change_mtu, 1648 .ndo_fix_features = ibmveth_fix_features, 1649 .ndo_set_features = ibmveth_set_features, 1650 .ndo_validate_addr = eth_validate_addr, 1651 .ndo_set_mac_address = ibmveth_set_mac_addr, 1652 #ifdef CONFIG_NET_POLL_CONTROLLER 1653 .ndo_poll_controller = ibmveth_poll_controller, 1654 #endif 1655 }; 1656 1657 static int ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id) 1658 { 1659 int rc, i, mac_len; 1660 struct net_device *netdev; 1661 struct ibmveth_adapter *adapter; 1662 unsigned char *mac_addr_p; 1663 __be32 *mcastFilterSize_p; 1664 long ret; 1665 unsigned long ret_attr; 1666 1667 dev_dbg(&dev->dev, "entering ibmveth_probe for UA 0x%x\n", 1668 dev->unit_address); 1669 1670 mac_addr_p = (unsigned char *)vio_get_attribute(dev, VETH_MAC_ADDR, 1671 &mac_len); 1672 if (!mac_addr_p) { 1673 dev_err(&dev->dev, "Can't find VETH_MAC_ADDR attribute\n"); 1674 return -EINVAL; 1675 } 1676 /* Workaround for old/broken pHyp */ 1677 if (mac_len == 8) 1678 mac_addr_p += 2; 1679 else if (mac_len != 6) { 1680 dev_err(&dev->dev, "VETH_MAC_ADDR attribute wrong len %d\n", 1681 mac_len); 1682 return -EINVAL; 1683 } 1684 1685 mcastFilterSize_p = (__be32 *)vio_get_attribute(dev, 1686 VETH_MCAST_FILTER_SIZE, 1687 NULL); 1688 if (!mcastFilterSize_p) { 1689 dev_err(&dev->dev, "Can't find VETH_MCAST_FILTER_SIZE " 1690 "attribute\n"); 1691 return -EINVAL; 1692 } 1693 1694 netdev = alloc_etherdev_mqs(sizeof(struct ibmveth_adapter), IBMVETH_MAX_QUEUES, 1); 1695 if (!netdev) 1696 return -ENOMEM; 1697 1698 adapter = netdev_priv(netdev); 1699 dev_set_drvdata(&dev->dev, netdev); 1700 1701 adapter->vdev = dev; 1702 adapter->netdev = netdev; 1703 adapter->mcastFilterSize = be32_to_cpu(*mcastFilterSize_p); 1704 adapter->pool_config = 0; 1705 ibmveth_init_link_settings(netdev); 1706 1707 netif_napi_add_weight(netdev, &adapter->napi, ibmveth_poll, 16); 1708 1709 netdev->irq = dev->irq; 1710 netdev->netdev_ops = &ibmveth_netdev_ops; 1711 netdev->ethtool_ops = &netdev_ethtool_ops; 1712 SET_NETDEV_DEV(netdev, &dev->dev); 1713 netdev->hw_features = NETIF_F_SG; 1714 if (vio_get_attribute(dev, "ibm,illan-options", NULL) != NULL) { 1715 netdev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM | 1716 NETIF_F_RXCSUM; 1717 } 1718 1719 netdev->features |= netdev->hw_features; 1720 1721 ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr); 1722 1723 /* If running older firmware, TSO should not be enabled by default */ 1724 if (ret == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_LRG_SND_SUPPORT) && 1725 !old_large_send) { 1726 netdev->hw_features |= NETIF_F_TSO | NETIF_F_TSO6; 1727 netdev->features |= netdev->hw_features; 1728 } else { 1729 netdev->hw_features |= NETIF_F_TSO; 1730 } 1731 1732 adapter->is_active_trunk = false; 1733 if (ret == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_ACTIVE_TRUNK)) { 1734 adapter->is_active_trunk = true; 1735 netdev->hw_features |= NETIF_F_FRAGLIST; 1736 netdev->features |= NETIF_F_FRAGLIST; 1737 } 1738 1739 netdev->min_mtu = IBMVETH_MIN_MTU; 1740 netdev->max_mtu = ETH_MAX_MTU - IBMVETH_BUFF_OH; 1741 1742 eth_hw_addr_set(netdev, mac_addr_p); 1743 1744 if (firmware_has_feature(FW_FEATURE_CMO)) 1745 memcpy(pool_count, pool_count_cmo, sizeof(pool_count)); 1746 1747 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) { 1748 struct kobject *kobj = &adapter->rx_buff_pool[i].kobj; 1749 int error; 1750 1751 ibmveth_init_buffer_pool(&adapter->rx_buff_pool[i], i, 1752 pool_count[i], pool_size[i], 1753 pool_active[i]); 1754 error = kobject_init_and_add(kobj, &ktype_veth_pool, 1755 &dev->dev.kobj, "pool%d", i); 1756 if (!error) 1757 kobject_uevent(kobj, KOBJ_ADD); 1758 } 1759 1760 rc = netif_set_real_num_tx_queues(netdev, min(num_online_cpus(), 1761 IBMVETH_DEFAULT_QUEUES)); 1762 if (rc) { 1763 netdev_dbg(netdev, "failed to set number of tx queues rc=%d\n", 1764 rc); 1765 free_netdev(netdev); 1766 return rc; 1767 } 1768 adapter->tx_ltb_size = PAGE_ALIGN(IBMVETH_MAX_TX_BUF_SIZE); 1769 for (i = 0; i < IBMVETH_MAX_QUEUES; i++) 1770 adapter->tx_ltb_ptr[i] = NULL; 1771 1772 netdev_dbg(netdev, "adapter @ 0x%p\n", adapter); 1773 netdev_dbg(netdev, "registering netdev...\n"); 1774 1775 ibmveth_set_features(netdev, netdev->features); 1776 1777 rc = register_netdev(netdev); 1778 1779 if (rc) { 1780 netdev_dbg(netdev, "failed to register netdev rc=%d\n", rc); 1781 free_netdev(netdev); 1782 return rc; 1783 } 1784 1785 netdev_dbg(netdev, "registered\n"); 1786 1787 return 0; 1788 } 1789 1790 static void ibmveth_remove(struct vio_dev *dev) 1791 { 1792 struct net_device *netdev = dev_get_drvdata(&dev->dev); 1793 struct ibmveth_adapter *adapter = netdev_priv(netdev); 1794 int i; 1795 1796 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) 1797 kobject_put(&adapter->rx_buff_pool[i].kobj); 1798 1799 unregister_netdev(netdev); 1800 1801 free_netdev(netdev); 1802 dev_set_drvdata(&dev->dev, NULL); 1803 } 1804 1805 static struct attribute veth_active_attr; 1806 static struct attribute veth_num_attr; 1807 static struct attribute veth_size_attr; 1808 1809 static ssize_t veth_pool_show(struct kobject *kobj, 1810 struct attribute *attr, char *buf) 1811 { 1812 struct ibmveth_buff_pool *pool = container_of(kobj, 1813 struct ibmveth_buff_pool, 1814 kobj); 1815 1816 if (attr == &veth_active_attr) 1817 return sprintf(buf, "%d\n", pool->active); 1818 else if (attr == &veth_num_attr) 1819 return sprintf(buf, "%d\n", pool->size); 1820 else if (attr == &veth_size_attr) 1821 return sprintf(buf, "%d\n", pool->buff_size); 1822 return 0; 1823 } 1824 1825 static ssize_t veth_pool_store(struct kobject *kobj, struct attribute *attr, 1826 const char *buf, size_t count) 1827 { 1828 struct ibmveth_buff_pool *pool = container_of(kobj, 1829 struct ibmveth_buff_pool, 1830 kobj); 1831 struct net_device *netdev = dev_get_drvdata(kobj_to_dev(kobj->parent)); 1832 struct ibmveth_adapter *adapter = netdev_priv(netdev); 1833 long value = simple_strtol(buf, NULL, 10); 1834 long rc; 1835 1836 if (attr == &veth_active_attr) { 1837 if (value && !pool->active) { 1838 if (netif_running(netdev)) { 1839 if (ibmveth_alloc_buffer_pool(pool)) { 1840 netdev_err(netdev, 1841 "unable to alloc pool\n"); 1842 return -ENOMEM; 1843 } 1844 pool->active = 1; 1845 adapter->pool_config = 1; 1846 ibmveth_close(netdev); 1847 adapter->pool_config = 0; 1848 if ((rc = ibmveth_open(netdev))) 1849 return rc; 1850 } else { 1851 pool->active = 1; 1852 } 1853 } else if (!value && pool->active) { 1854 int mtu = netdev->mtu + IBMVETH_BUFF_OH; 1855 int i; 1856 /* Make sure there is a buffer pool with buffers that 1857 can hold a packet of the size of the MTU */ 1858 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) { 1859 if (pool == &adapter->rx_buff_pool[i]) 1860 continue; 1861 if (!adapter->rx_buff_pool[i].active) 1862 continue; 1863 if (mtu <= adapter->rx_buff_pool[i].buff_size) 1864 break; 1865 } 1866 1867 if (i == IBMVETH_NUM_BUFF_POOLS) { 1868 netdev_err(netdev, "no active pool >= MTU\n"); 1869 return -EPERM; 1870 } 1871 1872 if (netif_running(netdev)) { 1873 adapter->pool_config = 1; 1874 ibmveth_close(netdev); 1875 pool->active = 0; 1876 adapter->pool_config = 0; 1877 if ((rc = ibmveth_open(netdev))) 1878 return rc; 1879 } 1880 pool->active = 0; 1881 } 1882 } else if (attr == &veth_num_attr) { 1883 if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT) { 1884 return -EINVAL; 1885 } else { 1886 if (netif_running(netdev)) { 1887 adapter->pool_config = 1; 1888 ibmveth_close(netdev); 1889 adapter->pool_config = 0; 1890 pool->size = value; 1891 if ((rc = ibmveth_open(netdev))) 1892 return rc; 1893 } else { 1894 pool->size = value; 1895 } 1896 } 1897 } else if (attr == &veth_size_attr) { 1898 if (value <= IBMVETH_BUFF_OH || value > IBMVETH_MAX_BUF_SIZE) { 1899 return -EINVAL; 1900 } else { 1901 if (netif_running(netdev)) { 1902 adapter->pool_config = 1; 1903 ibmveth_close(netdev); 1904 adapter->pool_config = 0; 1905 pool->buff_size = value; 1906 if ((rc = ibmveth_open(netdev))) 1907 return rc; 1908 } else { 1909 pool->buff_size = value; 1910 } 1911 } 1912 } 1913 1914 /* kick the interrupt handler to allocate/deallocate pools */ 1915 ibmveth_interrupt(netdev->irq, netdev); 1916 return count; 1917 } 1918 1919 1920 #define ATTR(_name, _mode) \ 1921 struct attribute veth_##_name##_attr = { \ 1922 .name = __stringify(_name), .mode = _mode, \ 1923 }; 1924 1925 static ATTR(active, 0644); 1926 static ATTR(num, 0644); 1927 static ATTR(size, 0644); 1928 1929 static struct attribute *veth_pool_attrs[] = { 1930 &veth_active_attr, 1931 &veth_num_attr, 1932 &veth_size_attr, 1933 NULL, 1934 }; 1935 ATTRIBUTE_GROUPS(veth_pool); 1936 1937 static const struct sysfs_ops veth_pool_ops = { 1938 .show = veth_pool_show, 1939 .store = veth_pool_store, 1940 }; 1941 1942 static struct kobj_type ktype_veth_pool = { 1943 .release = NULL, 1944 .sysfs_ops = &veth_pool_ops, 1945 .default_groups = veth_pool_groups, 1946 }; 1947 1948 static int ibmveth_resume(struct device *dev) 1949 { 1950 struct net_device *netdev = dev_get_drvdata(dev); 1951 ibmveth_interrupt(netdev->irq, netdev); 1952 return 0; 1953 } 1954 1955 static const struct vio_device_id ibmveth_device_table[] = { 1956 { "network", "IBM,l-lan"}, 1957 { "", "" } 1958 }; 1959 MODULE_DEVICE_TABLE(vio, ibmveth_device_table); 1960 1961 static const struct dev_pm_ops ibmveth_pm_ops = { 1962 .resume = ibmveth_resume 1963 }; 1964 1965 static struct vio_driver ibmveth_driver = { 1966 .id_table = ibmveth_device_table, 1967 .probe = ibmveth_probe, 1968 .remove = ibmveth_remove, 1969 .get_desired_dma = ibmveth_get_desired_dma, 1970 .name = ibmveth_driver_name, 1971 .pm = &ibmveth_pm_ops, 1972 }; 1973 1974 static int __init ibmveth_module_init(void) 1975 { 1976 printk(KERN_DEBUG "%s: %s %s\n", ibmveth_driver_name, 1977 ibmveth_driver_string, ibmveth_driver_version); 1978 1979 return vio_register_driver(&ibmveth_driver); 1980 } 1981 1982 static void __exit ibmveth_module_exit(void) 1983 { 1984 vio_unregister_driver(&ibmveth_driver); 1985 } 1986 1987 module_init(ibmveth_module_init); 1988 module_exit(ibmveth_module_exit); 1989