1/* 2 * IBM Power Virtual Ethernet Device Driver 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2 of the License, or 7 * (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, see <http://www.gnu.org/licenses/>. 16 * 17 * Copyright (C) IBM Corporation, 2003, 2010 18 * 19 * Authors: Dave Larson <larson1@us.ibm.com> 20 * Santiago Leon <santil@linux.vnet.ibm.com> 21 * Brian King <brking@linux.vnet.ibm.com> 22 * Robert Jennings <rcj@linux.vnet.ibm.com> 23 * Anton Blanchard <anton@au.ibm.com> 24 */ 25 26#include <linux/module.h> 27#include <linux/moduleparam.h> 28#include <linux/types.h> 29#include <linux/errno.h> 30#include <linux/dma-mapping.h> 31#include <linux/kernel.h> 32#include <linux/netdevice.h> 33#include <linux/etherdevice.h> 34#include <linux/skbuff.h> 35#include <linux/init.h> 36#include <linux/interrupt.h> 37#include <linux/mm.h> 38#include <linux/pm.h> 39#include <linux/ethtool.h> 40#include <linux/in.h> 41#include <linux/ip.h> 42#include <linux/ipv6.h> 43#include <linux/slab.h> 44#include <asm/hvcall.h> 45#include <linux/atomic.h> 46#include <asm/vio.h> 47#include <asm/iommu.h> 48#include <asm/firmware.h> 49 50#include "ibmveth.h" 51 52static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance); 53static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter); 54static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev); 55 56static struct kobj_type ktype_veth_pool; 57 58 59static const char ibmveth_driver_name[] = "ibmveth"; 60static const char ibmveth_driver_string[] = "IBM Power Virtual Ethernet Driver"; 61#define ibmveth_driver_version "1.04" 62 63MODULE_AUTHOR("Santiago Leon <santil@linux.vnet.ibm.com>"); 64MODULE_DESCRIPTION("IBM Power Virtual Ethernet Driver"); 65MODULE_LICENSE("GPL"); 66MODULE_VERSION(ibmveth_driver_version); 67 68static unsigned int tx_copybreak __read_mostly = 128; 69module_param(tx_copybreak, uint, 0644); 70MODULE_PARM_DESC(tx_copybreak, 71 "Maximum size of packet that is copied to a new buffer on transmit"); 72 73static unsigned int rx_copybreak __read_mostly = 128; 74module_param(rx_copybreak, uint, 0644); 75MODULE_PARM_DESC(rx_copybreak, 76 "Maximum size of packet that is copied to a new buffer on receive"); 77 78static unsigned int rx_flush __read_mostly = 0; 79module_param(rx_flush, uint, 0644); 80MODULE_PARM_DESC(rx_flush, "Flush receive buffers before use"); 81 82struct ibmveth_stat { 83 char name[ETH_GSTRING_LEN]; 84 int offset; 85}; 86 87#define IBMVETH_STAT_OFF(stat) offsetof(struct ibmveth_adapter, stat) 88#define IBMVETH_GET_STAT(a, off) *((u64 *)(((unsigned long)(a)) + off)) 89 90struct ibmveth_stat ibmveth_stats[] = { 91 { "replenish_task_cycles", IBMVETH_STAT_OFF(replenish_task_cycles) }, 92 { "replenish_no_mem", IBMVETH_STAT_OFF(replenish_no_mem) }, 93 { "replenish_add_buff_failure", 94 IBMVETH_STAT_OFF(replenish_add_buff_failure) }, 95 { "replenish_add_buff_success", 96 IBMVETH_STAT_OFF(replenish_add_buff_success) }, 97 { "rx_invalid_buffer", IBMVETH_STAT_OFF(rx_invalid_buffer) }, 98 { "rx_no_buffer", IBMVETH_STAT_OFF(rx_no_buffer) }, 99 { "tx_map_failed", IBMVETH_STAT_OFF(tx_map_failed) }, 100 { "tx_send_failed", IBMVETH_STAT_OFF(tx_send_failed) }, 101 { "fw_enabled_ipv4_csum", IBMVETH_STAT_OFF(fw_ipv4_csum_support) }, 102 { "fw_enabled_ipv6_csum", IBMVETH_STAT_OFF(fw_ipv6_csum_support) }, 103}; 104 105/* simple methods of getting data from the current rxq entry */ 106static inline u32 ibmveth_rxq_flags(struct ibmveth_adapter *adapter) 107{ 108 return be32_to_cpu(adapter->rx_queue.queue_addr[adapter->rx_queue.index].flags_off); 109} 110 111static inline int ibmveth_rxq_toggle(struct ibmveth_adapter *adapter) 112{ 113 return (ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_TOGGLE) >> 114 IBMVETH_RXQ_TOGGLE_SHIFT; 115} 116 117static inline int ibmveth_rxq_pending_buffer(struct ibmveth_adapter *adapter) 118{ 119 return ibmveth_rxq_toggle(adapter) == adapter->rx_queue.toggle; 120} 121 122static inline int ibmveth_rxq_buffer_valid(struct ibmveth_adapter *adapter) 123{ 124 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_VALID; 125} 126 127static inline int ibmveth_rxq_frame_offset(struct ibmveth_adapter *adapter) 128{ 129 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_OFF_MASK; 130} 131 132static inline int ibmveth_rxq_frame_length(struct ibmveth_adapter *adapter) 133{ 134 return be32_to_cpu(adapter->rx_queue.queue_addr[adapter->rx_queue.index].length); 135} 136 137static inline int ibmveth_rxq_csum_good(struct ibmveth_adapter *adapter) 138{ 139 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_CSUM_GOOD; 140} 141 142/* setup the initial settings for a buffer pool */ 143static void ibmveth_init_buffer_pool(struct ibmveth_buff_pool *pool, 144 u32 pool_index, u32 pool_size, 145 u32 buff_size, u32 pool_active) 146{ 147 pool->size = pool_size; 148 pool->index = pool_index; 149 pool->buff_size = buff_size; 150 pool->threshold = pool_size * 7 / 8; 151 pool->active = pool_active; 152} 153 154/* allocate and setup an buffer pool - called during open */ 155static int ibmveth_alloc_buffer_pool(struct ibmveth_buff_pool *pool) 156{ 157 int i; 158 159 pool->free_map = kmalloc(sizeof(u16) * pool->size, GFP_KERNEL); 160 161 if (!pool->free_map) 162 return -1; 163 164 pool->dma_addr = kmalloc(sizeof(dma_addr_t) * pool->size, GFP_KERNEL); 165 if (!pool->dma_addr) { 166 kfree(pool->free_map); 167 pool->free_map = NULL; 168 return -1; 169 } 170 171 pool->skbuff = kcalloc(pool->size, sizeof(void *), GFP_KERNEL); 172 173 if (!pool->skbuff) { 174 kfree(pool->dma_addr); 175 pool->dma_addr = NULL; 176 177 kfree(pool->free_map); 178 pool->free_map = NULL; 179 return -1; 180 } 181 182 memset(pool->dma_addr, 0, sizeof(dma_addr_t) * pool->size); 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 194static 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 */ 205static 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 277failure: 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 */ 300static 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 */ 308static 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 */ 326static 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 */ 360static 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 */ 395static 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 */ 408static 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 445out: 446 return ret; 447} 448 449static 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 459static void ibmveth_cleanup(struct ibmveth_adapter *adapter) 460{ 461 int i; 462 struct device *dev = &adapter->vdev->dev; 463 464 if (adapter->buffer_list_addr != NULL) { 465 if (!dma_mapping_error(dev, adapter->buffer_list_dma)) { 466 dma_unmap_single(dev, adapter->buffer_list_dma, 4096, 467 DMA_BIDIRECTIONAL); 468 adapter->buffer_list_dma = DMA_ERROR_CODE; 469 } 470 free_page((unsigned long)adapter->buffer_list_addr); 471 adapter->buffer_list_addr = NULL; 472 } 473 474 if (adapter->filter_list_addr != NULL) { 475 if (!dma_mapping_error(dev, adapter->filter_list_dma)) { 476 dma_unmap_single(dev, adapter->filter_list_dma, 4096, 477 DMA_BIDIRECTIONAL); 478 adapter->filter_list_dma = DMA_ERROR_CODE; 479 } 480 free_page((unsigned long)adapter->filter_list_addr); 481 adapter->filter_list_addr = NULL; 482 } 483 484 if (adapter->rx_queue.queue_addr != NULL) { 485 dma_free_coherent(dev, adapter->rx_queue.queue_len, 486 adapter->rx_queue.queue_addr, 487 adapter->rx_queue.queue_dma); 488 adapter->rx_queue.queue_addr = NULL; 489 } 490 491 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) 492 if (adapter->rx_buff_pool[i].active) 493 ibmveth_free_buffer_pool(adapter, 494 &adapter->rx_buff_pool[i]); 495 496 if (adapter->bounce_buffer != NULL) { 497 if (!dma_mapping_error(dev, adapter->bounce_buffer_dma)) { 498 dma_unmap_single(&adapter->vdev->dev, 499 adapter->bounce_buffer_dma, 500 adapter->netdev->mtu + IBMVETH_BUFF_OH, 501 DMA_BIDIRECTIONAL); 502 adapter->bounce_buffer_dma = DMA_ERROR_CODE; 503 } 504 kfree(adapter->bounce_buffer); 505 adapter->bounce_buffer = NULL; 506 } 507} 508 509static int ibmveth_register_logical_lan(struct ibmveth_adapter *adapter, 510 union ibmveth_buf_desc rxq_desc, u64 mac_address) 511{ 512 int rc, try_again = 1; 513 514 /* 515 * After a kexec the adapter will still be open, so our attempt to 516 * open it will fail. So if we get a failure we free the adapter and 517 * try again, but only once. 518 */ 519retry: 520 rc = h_register_logical_lan(adapter->vdev->unit_address, 521 adapter->buffer_list_dma, rxq_desc.desc, 522 adapter->filter_list_dma, mac_address); 523 524 if (rc != H_SUCCESS && try_again) { 525 do { 526 rc = h_free_logical_lan(adapter->vdev->unit_address); 527 } while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY)); 528 529 try_again = 0; 530 goto retry; 531 } 532 533 return rc; 534} 535 536static u64 ibmveth_encode_mac_addr(u8 *mac) 537{ 538 int i; 539 u64 encoded = 0; 540 541 for (i = 0; i < ETH_ALEN; i++) 542 encoded = (encoded << 8) | mac[i]; 543 544 return encoded; 545} 546 547static int ibmveth_open(struct net_device *netdev) 548{ 549 struct ibmveth_adapter *adapter = netdev_priv(netdev); 550 u64 mac_address; 551 int rxq_entries = 1; 552 unsigned long lpar_rc; 553 int rc; 554 union ibmveth_buf_desc rxq_desc; 555 int i; 556 struct device *dev; 557 558 netdev_dbg(netdev, "open starting\n"); 559 560 napi_enable(&adapter->napi); 561 562 for(i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) 563 rxq_entries += adapter->rx_buff_pool[i].size; 564 565 adapter->buffer_list_addr = (void*) get_zeroed_page(GFP_KERNEL); 566 adapter->filter_list_addr = (void*) get_zeroed_page(GFP_KERNEL); 567 568 if (!adapter->buffer_list_addr || !adapter->filter_list_addr) { 569 netdev_err(netdev, "unable to allocate filter or buffer list " 570 "pages\n"); 571 rc = -ENOMEM; 572 goto err_out; 573 } 574 575 dev = &adapter->vdev->dev; 576 577 adapter->rx_queue.queue_len = sizeof(struct ibmveth_rx_q_entry) * 578 rxq_entries; 579 adapter->rx_queue.queue_addr = 580 dma_alloc_coherent(dev, adapter->rx_queue.queue_len, 581 &adapter->rx_queue.queue_dma, GFP_KERNEL); 582 if (!adapter->rx_queue.queue_addr) { 583 rc = -ENOMEM; 584 goto err_out; 585 } 586 587 adapter->buffer_list_dma = dma_map_single(dev, 588 adapter->buffer_list_addr, 4096, DMA_BIDIRECTIONAL); 589 adapter->filter_list_dma = dma_map_single(dev, 590 adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL); 591 592 if ((dma_mapping_error(dev, adapter->buffer_list_dma)) || 593 (dma_mapping_error(dev, adapter->filter_list_dma))) { 594 netdev_err(netdev, "unable to map filter or buffer list " 595 "pages\n"); 596 rc = -ENOMEM; 597 goto err_out; 598 } 599 600 adapter->rx_queue.index = 0; 601 adapter->rx_queue.num_slots = rxq_entries; 602 adapter->rx_queue.toggle = 1; 603 604 mac_address = ibmveth_encode_mac_addr(netdev->dev_addr); 605 606 rxq_desc.fields.flags_len = IBMVETH_BUF_VALID | 607 adapter->rx_queue.queue_len; 608 rxq_desc.fields.address = adapter->rx_queue.queue_dma; 609 610 netdev_dbg(netdev, "buffer list @ 0x%p\n", adapter->buffer_list_addr); 611 netdev_dbg(netdev, "filter list @ 0x%p\n", adapter->filter_list_addr); 612 netdev_dbg(netdev, "receive q @ 0x%p\n", adapter->rx_queue.queue_addr); 613 614 h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE); 615 616 lpar_rc = ibmveth_register_logical_lan(adapter, rxq_desc, mac_address); 617 618 if (lpar_rc != H_SUCCESS) { 619 netdev_err(netdev, "h_register_logical_lan failed with %ld\n", 620 lpar_rc); 621 netdev_err(netdev, "buffer TCE:0x%llx filter TCE:0x%llx rxq " 622 "desc:0x%llx MAC:0x%llx\n", 623 adapter->buffer_list_dma, 624 adapter->filter_list_dma, 625 rxq_desc.desc, 626 mac_address); 627 rc = -ENONET; 628 goto err_out; 629 } 630 631 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) { 632 if (!adapter->rx_buff_pool[i].active) 633 continue; 634 if (ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[i])) { 635 netdev_err(netdev, "unable to alloc pool\n"); 636 adapter->rx_buff_pool[i].active = 0; 637 rc = -ENOMEM; 638 goto err_out; 639 } 640 } 641 642 netdev_dbg(netdev, "registering irq 0x%x\n", netdev->irq); 643 rc = request_irq(netdev->irq, ibmveth_interrupt, 0, netdev->name, 644 netdev); 645 if (rc != 0) { 646 netdev_err(netdev, "unable to request irq 0x%x, rc %d\n", 647 netdev->irq, rc); 648 do { 649 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address); 650 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY)); 651 652 goto err_out; 653 } 654 655 adapter->bounce_buffer = 656 kmalloc(netdev->mtu + IBMVETH_BUFF_OH, GFP_KERNEL); 657 if (!adapter->bounce_buffer) { 658 rc = -ENOMEM; 659 goto err_out_free_irq; 660 } 661 adapter->bounce_buffer_dma = 662 dma_map_single(&adapter->vdev->dev, adapter->bounce_buffer, 663 netdev->mtu + IBMVETH_BUFF_OH, DMA_BIDIRECTIONAL); 664 if (dma_mapping_error(dev, adapter->bounce_buffer_dma)) { 665 netdev_err(netdev, "unable to map bounce buffer\n"); 666 rc = -ENOMEM; 667 goto err_out_free_irq; 668 } 669 670 netdev_dbg(netdev, "initial replenish cycle\n"); 671 ibmveth_interrupt(netdev->irq, netdev); 672 673 netif_start_queue(netdev); 674 675 netdev_dbg(netdev, "open complete\n"); 676 677 return 0; 678 679err_out_free_irq: 680 free_irq(netdev->irq, netdev); 681err_out: 682 ibmveth_cleanup(adapter); 683 napi_disable(&adapter->napi); 684 return rc; 685} 686 687static int ibmveth_close(struct net_device *netdev) 688{ 689 struct ibmveth_adapter *adapter = netdev_priv(netdev); 690 long lpar_rc; 691 692 netdev_dbg(netdev, "close starting\n"); 693 694 napi_disable(&adapter->napi); 695 696 if (!adapter->pool_config) 697 netif_stop_queue(netdev); 698 699 h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE); 700 701 do { 702 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address); 703 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY)); 704 705 if (lpar_rc != H_SUCCESS) { 706 netdev_err(netdev, "h_free_logical_lan failed with %lx, " 707 "continuing with close\n", lpar_rc); 708 } 709 710 free_irq(netdev->irq, netdev); 711 712 ibmveth_update_rx_no_buffer(adapter); 713 714 ibmveth_cleanup(adapter); 715 716 netdev_dbg(netdev, "close complete\n"); 717 718 return 0; 719} 720 721static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) 722{ 723 cmd->supported = (SUPPORTED_1000baseT_Full | SUPPORTED_Autoneg | 724 SUPPORTED_FIBRE); 725 cmd->advertising = (ADVERTISED_1000baseT_Full | ADVERTISED_Autoneg | 726 ADVERTISED_FIBRE); 727 ethtool_cmd_speed_set(cmd, SPEED_1000); 728 cmd->duplex = DUPLEX_FULL; 729 cmd->port = PORT_FIBRE; 730 cmd->phy_address = 0; 731 cmd->transceiver = XCVR_INTERNAL; 732 cmd->autoneg = AUTONEG_ENABLE; 733 cmd->maxtxpkt = 0; 734 cmd->maxrxpkt = 1; 735 return 0; 736} 737 738static void netdev_get_drvinfo(struct net_device *dev, 739 struct ethtool_drvinfo *info) 740{ 741 strlcpy(info->driver, ibmveth_driver_name, sizeof(info->driver)); 742 strlcpy(info->version, ibmveth_driver_version, sizeof(info->version)); 743} 744 745static netdev_features_t ibmveth_fix_features(struct net_device *dev, 746 netdev_features_t features) 747{ 748 /* 749 * Since the ibmveth firmware interface does not have the 750 * concept of separate tx/rx checksum offload enable, if rx 751 * checksum is disabled we also have to disable tx checksum 752 * offload. Once we disable rx checksum offload, we are no 753 * longer allowed to send tx buffers that are not properly 754 * checksummed. 755 */ 756 757 if (!(features & NETIF_F_RXCSUM)) 758 features &= ~NETIF_F_ALL_CSUM; 759 760 return features; 761} 762 763static int ibmveth_set_csum_offload(struct net_device *dev, u32 data) 764{ 765 struct ibmveth_adapter *adapter = netdev_priv(dev); 766 unsigned long set_attr, clr_attr, ret_attr; 767 unsigned long set_attr6, clr_attr6; 768 long ret, ret4, ret6; 769 int rc1 = 0, rc2 = 0; 770 int restart = 0; 771 772 if (netif_running(dev)) { 773 restart = 1; 774 adapter->pool_config = 1; 775 ibmveth_close(dev); 776 adapter->pool_config = 0; 777 } 778 779 set_attr = 0; 780 clr_attr = 0; 781 set_attr6 = 0; 782 clr_attr6 = 0; 783 784 if (data) { 785 set_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM; 786 set_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM; 787 } else { 788 clr_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM; 789 clr_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM; 790 } 791 792 ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr); 793 794 if (ret == H_SUCCESS && !(ret_attr & IBMVETH_ILLAN_ACTIVE_TRUNK) && 795 !(ret_attr & IBMVETH_ILLAN_TRUNK_PRI_MASK) && 796 (ret_attr & IBMVETH_ILLAN_PADDED_PKT_CSUM)) { 797 ret4 = h_illan_attributes(adapter->vdev->unit_address, clr_attr, 798 set_attr, &ret_attr); 799 800 if (ret4 != H_SUCCESS) { 801 netdev_err(dev, "unable to change IPv4 checksum " 802 "offload settings. %d rc=%ld\n", 803 data, ret4); 804 805 h_illan_attributes(adapter->vdev->unit_address, 806 set_attr, clr_attr, &ret_attr); 807 808 if (data == 1) 809 dev->features &= ~NETIF_F_IP_CSUM; 810 811 } else { 812 adapter->fw_ipv4_csum_support = data; 813 } 814 815 ret6 = h_illan_attributes(adapter->vdev->unit_address, 816 clr_attr6, set_attr6, &ret_attr); 817 818 if (ret6 != H_SUCCESS) { 819 netdev_err(dev, "unable to change IPv6 checksum " 820 "offload settings. %d rc=%ld\n", 821 data, ret6); 822 823 h_illan_attributes(adapter->vdev->unit_address, 824 set_attr6, clr_attr6, &ret_attr); 825 826 if (data == 1) 827 dev->features &= ~NETIF_F_IPV6_CSUM; 828 829 } else 830 adapter->fw_ipv6_csum_support = data; 831 832 if (ret4 == H_SUCCESS || ret6 == H_SUCCESS) 833 adapter->rx_csum = data; 834 else 835 rc1 = -EIO; 836 } else { 837 rc1 = -EIO; 838 netdev_err(dev, "unable to change checksum offload settings." 839 " %d rc=%ld ret_attr=%lx\n", data, ret, 840 ret_attr); 841 } 842 843 if (restart) 844 rc2 = ibmveth_open(dev); 845 846 return rc1 ? rc1 : rc2; 847} 848 849static int ibmveth_set_features(struct net_device *dev, 850 netdev_features_t features) 851{ 852 struct ibmveth_adapter *adapter = netdev_priv(dev); 853 int rx_csum = !!(features & NETIF_F_RXCSUM); 854 int rc; 855 856 if (rx_csum == adapter->rx_csum) 857 return 0; 858 859 rc = ibmveth_set_csum_offload(dev, rx_csum); 860 if (rc && !adapter->rx_csum) 861 dev->features = features & ~(NETIF_F_ALL_CSUM | NETIF_F_RXCSUM); 862 863 return rc; 864} 865 866static void ibmveth_get_strings(struct net_device *dev, u32 stringset, u8 *data) 867{ 868 int i; 869 870 if (stringset != ETH_SS_STATS) 871 return; 872 873 for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++, data += ETH_GSTRING_LEN) 874 memcpy(data, ibmveth_stats[i].name, ETH_GSTRING_LEN); 875} 876 877static int ibmveth_get_sset_count(struct net_device *dev, int sset) 878{ 879 switch (sset) { 880 case ETH_SS_STATS: 881 return ARRAY_SIZE(ibmveth_stats); 882 default: 883 return -EOPNOTSUPP; 884 } 885} 886 887static void ibmveth_get_ethtool_stats(struct net_device *dev, 888 struct ethtool_stats *stats, u64 *data) 889{ 890 int i; 891 struct ibmveth_adapter *adapter = netdev_priv(dev); 892 893 for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++) 894 data[i] = IBMVETH_GET_STAT(adapter, ibmveth_stats[i].offset); 895} 896 897static const struct ethtool_ops netdev_ethtool_ops = { 898 .get_drvinfo = netdev_get_drvinfo, 899 .get_settings = netdev_get_settings, 900 .get_link = ethtool_op_get_link, 901 .get_strings = ibmveth_get_strings, 902 .get_sset_count = ibmveth_get_sset_count, 903 .get_ethtool_stats = ibmveth_get_ethtool_stats, 904}; 905 906static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 907{ 908 return -EOPNOTSUPP; 909} 910 911#define page_offset(v) ((unsigned long)(v) & ((1 << 12) - 1)) 912 913static int ibmveth_send(struct ibmveth_adapter *adapter, 914 union ibmveth_buf_desc *descs) 915{ 916 unsigned long correlator; 917 unsigned int retry_count; 918 unsigned long ret; 919 920 /* 921 * The retry count sets a maximum for the number of broadcast and 922 * multicast destinations within the system. 923 */ 924 retry_count = 1024; 925 correlator = 0; 926 do { 927 ret = h_send_logical_lan(adapter->vdev->unit_address, 928 descs[0].desc, descs[1].desc, 929 descs[2].desc, descs[3].desc, 930 descs[4].desc, descs[5].desc, 931 correlator, &correlator); 932 } while ((ret == H_BUSY) && (retry_count--)); 933 934 if (ret != H_SUCCESS && ret != H_DROPPED) { 935 netdev_err(adapter->netdev, "tx: h_send_logical_lan failed " 936 "with rc=%ld\n", ret); 937 return 1; 938 } 939 940 return 0; 941} 942 943static netdev_tx_t ibmveth_start_xmit(struct sk_buff *skb, 944 struct net_device *netdev) 945{ 946 struct ibmveth_adapter *adapter = netdev_priv(netdev); 947 unsigned int desc_flags; 948 union ibmveth_buf_desc descs[6]; 949 int last, i; 950 int force_bounce = 0; 951 dma_addr_t dma_addr; 952 953 /* 954 * veth handles a maximum of 6 segments including the header, so 955 * we have to linearize the skb if there are more than this. 956 */ 957 if (skb_shinfo(skb)->nr_frags > 5 && __skb_linearize(skb)) { 958 netdev->stats.tx_dropped++; 959 goto out; 960 } 961 962 /* veth can't checksum offload UDP */ 963 if (skb->ip_summed == CHECKSUM_PARTIAL && 964 ((skb->protocol == htons(ETH_P_IP) && 965 ip_hdr(skb)->protocol != IPPROTO_TCP) || 966 (skb->protocol == htons(ETH_P_IPV6) && 967 ipv6_hdr(skb)->nexthdr != IPPROTO_TCP)) && 968 skb_checksum_help(skb)) { 969 970 netdev_err(netdev, "tx: failed to checksum packet\n"); 971 netdev->stats.tx_dropped++; 972 goto out; 973 } 974 975 desc_flags = IBMVETH_BUF_VALID; 976 977 if (skb->ip_summed == CHECKSUM_PARTIAL) { 978 unsigned char *buf = skb_transport_header(skb) + 979 skb->csum_offset; 980 981 desc_flags |= (IBMVETH_BUF_NO_CSUM | IBMVETH_BUF_CSUM_GOOD); 982 983 /* Need to zero out the checksum */ 984 buf[0] = 0; 985 buf[1] = 0; 986 } 987 988retry_bounce: 989 memset(descs, 0, sizeof(descs)); 990 991 /* 992 * If a linear packet is below the rx threshold then 993 * copy it into the static bounce buffer. This avoids the 994 * cost of a TCE insert and remove. 995 */ 996 if (force_bounce || (!skb_is_nonlinear(skb) && 997 (skb->len < tx_copybreak))) { 998 skb_copy_from_linear_data(skb, adapter->bounce_buffer, 999 skb->len); 1000 1001 descs[0].fields.flags_len = desc_flags | skb->len; 1002 descs[0].fields.address = adapter->bounce_buffer_dma; 1003 1004 if (ibmveth_send(adapter, descs)) { 1005 adapter->tx_send_failed++; 1006 netdev->stats.tx_dropped++; 1007 } else { 1008 netdev->stats.tx_packets++; 1009 netdev->stats.tx_bytes += skb->len; 1010 } 1011 1012 goto out; 1013 } 1014 1015 /* Map the header */ 1016 dma_addr = dma_map_single(&adapter->vdev->dev, skb->data, 1017 skb_headlen(skb), DMA_TO_DEVICE); 1018 if (dma_mapping_error(&adapter->vdev->dev, dma_addr)) 1019 goto map_failed; 1020 1021 descs[0].fields.flags_len = desc_flags | skb_headlen(skb); 1022 descs[0].fields.address = dma_addr; 1023 1024 /* Map the frags */ 1025 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1026 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 1027 1028 dma_addr = skb_frag_dma_map(&adapter->vdev->dev, frag, 0, 1029 skb_frag_size(frag), DMA_TO_DEVICE); 1030 1031 if (dma_mapping_error(&adapter->vdev->dev, dma_addr)) 1032 goto map_failed_frags; 1033 1034 descs[i+1].fields.flags_len = desc_flags | skb_frag_size(frag); 1035 descs[i+1].fields.address = dma_addr; 1036 } 1037 1038 if (ibmveth_send(adapter, descs)) { 1039 adapter->tx_send_failed++; 1040 netdev->stats.tx_dropped++; 1041 } else { 1042 netdev->stats.tx_packets++; 1043 netdev->stats.tx_bytes += skb->len; 1044 } 1045 1046 dma_unmap_single(&adapter->vdev->dev, 1047 descs[0].fields.address, 1048 descs[0].fields.flags_len & IBMVETH_BUF_LEN_MASK, 1049 DMA_TO_DEVICE); 1050 1051 for (i = 1; i < skb_shinfo(skb)->nr_frags + 1; i++) 1052 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address, 1053 descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK, 1054 DMA_TO_DEVICE); 1055 1056out: 1057 dev_consume_skb_any(skb); 1058 return NETDEV_TX_OK; 1059 1060map_failed_frags: 1061 last = i+1; 1062 for (i = 0; i < last; i++) 1063 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address, 1064 descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK, 1065 DMA_TO_DEVICE); 1066 1067map_failed: 1068 if (!firmware_has_feature(FW_FEATURE_CMO)) 1069 netdev_err(netdev, "tx: unable to map xmit buffer\n"); 1070 adapter->tx_map_failed++; 1071 skb_linearize(skb); 1072 force_bounce = 1; 1073 goto retry_bounce; 1074} 1075 1076static int ibmveth_poll(struct napi_struct *napi, int budget) 1077{ 1078 struct ibmveth_adapter *adapter = 1079 container_of(napi, struct ibmveth_adapter, napi); 1080 struct net_device *netdev = adapter->netdev; 1081 int frames_processed = 0; 1082 unsigned long lpar_rc; 1083 1084restart_poll: 1085 while (frames_processed < budget) { 1086 if (!ibmveth_rxq_pending_buffer(adapter)) 1087 break; 1088 1089 smp_rmb(); 1090 if (!ibmveth_rxq_buffer_valid(adapter)) { 1091 wmb(); /* suggested by larson1 */ 1092 adapter->rx_invalid_buffer++; 1093 netdev_dbg(netdev, "recycling invalid buffer\n"); 1094 ibmveth_rxq_recycle_buffer(adapter); 1095 } else { 1096 struct sk_buff *skb, *new_skb; 1097 int length = ibmveth_rxq_frame_length(adapter); 1098 int offset = ibmveth_rxq_frame_offset(adapter); 1099 int csum_good = ibmveth_rxq_csum_good(adapter); 1100 1101 skb = ibmveth_rxq_get_buffer(adapter); 1102 1103 new_skb = NULL; 1104 if (length < rx_copybreak) 1105 new_skb = netdev_alloc_skb(netdev, length); 1106 1107 if (new_skb) { 1108 skb_copy_to_linear_data(new_skb, 1109 skb->data + offset, 1110 length); 1111 if (rx_flush) 1112 ibmveth_flush_buffer(skb->data, 1113 length + offset); 1114 if (!ibmveth_rxq_recycle_buffer(adapter)) 1115 kfree_skb(skb); 1116 skb = new_skb; 1117 } else { 1118 ibmveth_rxq_harvest_buffer(adapter); 1119 skb_reserve(skb, offset); 1120 } 1121 1122 skb_put(skb, length); 1123 skb->protocol = eth_type_trans(skb, netdev); 1124 1125 if (csum_good) 1126 skb->ip_summed = CHECKSUM_UNNECESSARY; 1127 1128 netif_receive_skb(skb); /* send it up */ 1129 1130 netdev->stats.rx_packets++; 1131 netdev->stats.rx_bytes += length; 1132 frames_processed++; 1133 } 1134 } 1135 1136 ibmveth_replenish_task(adapter); 1137 1138 if (frames_processed < budget) { 1139 /* We think we are done - reenable interrupts, 1140 * then check once more to make sure we are done. 1141 */ 1142 lpar_rc = h_vio_signal(adapter->vdev->unit_address, 1143 VIO_IRQ_ENABLE); 1144 1145 BUG_ON(lpar_rc != H_SUCCESS); 1146 1147 napi_complete(napi); 1148 1149 if (ibmveth_rxq_pending_buffer(adapter) && 1150 napi_reschedule(napi)) { 1151 lpar_rc = h_vio_signal(adapter->vdev->unit_address, 1152 VIO_IRQ_DISABLE); 1153 goto restart_poll; 1154 } 1155 } 1156 1157 return frames_processed; 1158} 1159 1160static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance) 1161{ 1162 struct net_device *netdev = dev_instance; 1163 struct ibmveth_adapter *adapter = netdev_priv(netdev); 1164 unsigned long lpar_rc; 1165 1166 if (napi_schedule_prep(&adapter->napi)) { 1167 lpar_rc = h_vio_signal(adapter->vdev->unit_address, 1168 VIO_IRQ_DISABLE); 1169 BUG_ON(lpar_rc != H_SUCCESS); 1170 __napi_schedule(&adapter->napi); 1171 } 1172 return IRQ_HANDLED; 1173} 1174 1175static void ibmveth_set_multicast_list(struct net_device *netdev) 1176{ 1177 struct ibmveth_adapter *adapter = netdev_priv(netdev); 1178 unsigned long lpar_rc; 1179 1180 if ((netdev->flags & IFF_PROMISC) || 1181 (netdev_mc_count(netdev) > adapter->mcastFilterSize)) { 1182 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address, 1183 IbmVethMcastEnableRecv | 1184 IbmVethMcastDisableFiltering, 1185 0); 1186 if (lpar_rc != H_SUCCESS) { 1187 netdev_err(netdev, "h_multicast_ctrl rc=%ld when " 1188 "entering promisc mode\n", lpar_rc); 1189 } 1190 } else { 1191 struct netdev_hw_addr *ha; 1192 /* clear the filter table & disable filtering */ 1193 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address, 1194 IbmVethMcastEnableRecv | 1195 IbmVethMcastDisableFiltering | 1196 IbmVethMcastClearFilterTable, 1197 0); 1198 if (lpar_rc != H_SUCCESS) { 1199 netdev_err(netdev, "h_multicast_ctrl rc=%ld when " 1200 "attempting to clear filter table\n", 1201 lpar_rc); 1202 } 1203 /* add the addresses to the filter table */ 1204 netdev_for_each_mc_addr(ha, netdev) { 1205 /* add the multicast address to the filter table */ 1206 u64 mcast_addr; 1207 mcast_addr = ibmveth_encode_mac_addr(ha->addr); 1208 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address, 1209 IbmVethMcastAddFilter, 1210 mcast_addr); 1211 if (lpar_rc != H_SUCCESS) { 1212 netdev_err(netdev, "h_multicast_ctrl rc=%ld " 1213 "when adding an entry to the filter " 1214 "table\n", lpar_rc); 1215 } 1216 } 1217 1218 /* re-enable filtering */ 1219 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address, 1220 IbmVethMcastEnableFiltering, 1221 0); 1222 if (lpar_rc != H_SUCCESS) { 1223 netdev_err(netdev, "h_multicast_ctrl rc=%ld when " 1224 "enabling filtering\n", lpar_rc); 1225 } 1226 } 1227} 1228 1229static int ibmveth_change_mtu(struct net_device *dev, int new_mtu) 1230{ 1231 struct ibmveth_adapter *adapter = netdev_priv(dev); 1232 struct vio_dev *viodev = adapter->vdev; 1233 int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH; 1234 int i, rc; 1235 int need_restart = 0; 1236 1237 if (new_mtu < IBMVETH_MIN_MTU) 1238 return -EINVAL; 1239 1240 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) 1241 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size) 1242 break; 1243 1244 if (i == IBMVETH_NUM_BUFF_POOLS) 1245 return -EINVAL; 1246 1247 /* Deactivate all the buffer pools so that the next loop can activate 1248 only the buffer pools necessary to hold the new MTU */ 1249 if (netif_running(adapter->netdev)) { 1250 need_restart = 1; 1251 adapter->pool_config = 1; 1252 ibmveth_close(adapter->netdev); 1253 adapter->pool_config = 0; 1254 } 1255 1256 /* Look for an active buffer pool that can hold the new MTU */ 1257 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) { 1258 adapter->rx_buff_pool[i].active = 1; 1259 1260 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size) { 1261 dev->mtu = new_mtu; 1262 vio_cmo_set_dev_desired(viodev, 1263 ibmveth_get_desired_dma 1264 (viodev)); 1265 if (need_restart) { 1266 return ibmveth_open(adapter->netdev); 1267 } 1268 return 0; 1269 } 1270 } 1271 1272 if (need_restart && (rc = ibmveth_open(adapter->netdev))) 1273 return rc; 1274 1275 return -EINVAL; 1276} 1277 1278#ifdef CONFIG_NET_POLL_CONTROLLER 1279static void ibmveth_poll_controller(struct net_device *dev) 1280{ 1281 ibmveth_replenish_task(netdev_priv(dev)); 1282 ibmveth_interrupt(dev->irq, dev); 1283} 1284#endif 1285 1286/** 1287 * ibmveth_get_desired_dma - Calculate IO memory desired by the driver 1288 * 1289 * @vdev: struct vio_dev for the device whose desired IO mem is to be returned 1290 * 1291 * Return value: 1292 * Number of bytes of IO data the driver will need to perform well. 1293 */ 1294static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev) 1295{ 1296 struct net_device *netdev = dev_get_drvdata(&vdev->dev); 1297 struct ibmveth_adapter *adapter; 1298 struct iommu_table *tbl; 1299 unsigned long ret; 1300 int i; 1301 int rxqentries = 1; 1302 1303 tbl = get_iommu_table_base(&vdev->dev); 1304 1305 /* netdev inits at probe time along with the structures we need below*/ 1306 if (netdev == NULL) 1307 return IOMMU_PAGE_ALIGN(IBMVETH_IO_ENTITLEMENT_DEFAULT, tbl); 1308 1309 adapter = netdev_priv(netdev); 1310 1311 ret = IBMVETH_BUFF_LIST_SIZE + IBMVETH_FILT_LIST_SIZE; 1312 ret += IOMMU_PAGE_ALIGN(netdev->mtu, tbl); 1313 1314 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) { 1315 /* add the size of the active receive buffers */ 1316 if (adapter->rx_buff_pool[i].active) 1317 ret += 1318 adapter->rx_buff_pool[i].size * 1319 IOMMU_PAGE_ALIGN(adapter->rx_buff_pool[i]. 1320 buff_size, tbl); 1321 rxqentries += adapter->rx_buff_pool[i].size; 1322 } 1323 /* add the size of the receive queue entries */ 1324 ret += IOMMU_PAGE_ALIGN( 1325 rxqentries * sizeof(struct ibmveth_rx_q_entry), tbl); 1326 1327 return ret; 1328} 1329 1330static const struct net_device_ops ibmveth_netdev_ops = { 1331 .ndo_open = ibmveth_open, 1332 .ndo_stop = ibmveth_close, 1333 .ndo_start_xmit = ibmveth_start_xmit, 1334 .ndo_set_rx_mode = ibmveth_set_multicast_list, 1335 .ndo_do_ioctl = ibmveth_ioctl, 1336 .ndo_change_mtu = ibmveth_change_mtu, 1337 .ndo_fix_features = ibmveth_fix_features, 1338 .ndo_set_features = ibmveth_set_features, 1339 .ndo_validate_addr = eth_validate_addr, 1340 .ndo_set_mac_address = eth_mac_addr, 1341#ifdef CONFIG_NET_POLL_CONTROLLER 1342 .ndo_poll_controller = ibmveth_poll_controller, 1343#endif 1344}; 1345 1346static int ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id) 1347{ 1348 int rc, i, mac_len; 1349 struct net_device *netdev; 1350 struct ibmveth_adapter *adapter; 1351 unsigned char *mac_addr_p; 1352 unsigned int *mcastFilterSize_p; 1353 1354 dev_dbg(&dev->dev, "entering ibmveth_probe for UA 0x%x\n", 1355 dev->unit_address); 1356 1357 mac_addr_p = (unsigned char *)vio_get_attribute(dev, VETH_MAC_ADDR, 1358 &mac_len); 1359 if (!mac_addr_p) { 1360 dev_err(&dev->dev, "Can't find VETH_MAC_ADDR attribute\n"); 1361 return -EINVAL; 1362 } 1363 /* Workaround for old/broken pHyp */ 1364 if (mac_len == 8) 1365 mac_addr_p += 2; 1366 else if (mac_len != 6) { 1367 dev_err(&dev->dev, "VETH_MAC_ADDR attribute wrong len %d\n", 1368 mac_len); 1369 return -EINVAL; 1370 } 1371 1372 mcastFilterSize_p = (unsigned int *)vio_get_attribute(dev, 1373 VETH_MCAST_FILTER_SIZE, NULL); 1374 if (!mcastFilterSize_p) { 1375 dev_err(&dev->dev, "Can't find VETH_MCAST_FILTER_SIZE " 1376 "attribute\n"); 1377 return -EINVAL; 1378 } 1379 1380 netdev = alloc_etherdev(sizeof(struct ibmveth_adapter)); 1381 1382 if (!netdev) 1383 return -ENOMEM; 1384 1385 adapter = netdev_priv(netdev); 1386 dev_set_drvdata(&dev->dev, netdev); 1387 1388 adapter->vdev = dev; 1389 adapter->netdev = netdev; 1390 adapter->mcastFilterSize = *mcastFilterSize_p; 1391 adapter->pool_config = 0; 1392 1393 netif_napi_add(netdev, &adapter->napi, ibmveth_poll, 16); 1394 1395 netdev->irq = dev->irq; 1396 netdev->netdev_ops = &ibmveth_netdev_ops; 1397 netdev->ethtool_ops = &netdev_ethtool_ops; 1398 SET_NETDEV_DEV(netdev, &dev->dev); 1399 netdev->hw_features = NETIF_F_SG | NETIF_F_RXCSUM | 1400 NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM; 1401 netdev->features |= netdev->hw_features; 1402 1403 memcpy(netdev->dev_addr, mac_addr_p, ETH_ALEN); 1404 1405 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) { 1406 struct kobject *kobj = &adapter->rx_buff_pool[i].kobj; 1407 int error; 1408 1409 ibmveth_init_buffer_pool(&adapter->rx_buff_pool[i], i, 1410 pool_count[i], pool_size[i], 1411 pool_active[i]); 1412 error = kobject_init_and_add(kobj, &ktype_veth_pool, 1413 &dev->dev.kobj, "pool%d", i); 1414 if (!error) 1415 kobject_uevent(kobj, KOBJ_ADD); 1416 } 1417 1418 netdev_dbg(netdev, "adapter @ 0x%p\n", adapter); 1419 1420 adapter->buffer_list_dma = DMA_ERROR_CODE; 1421 adapter->filter_list_dma = DMA_ERROR_CODE; 1422 adapter->rx_queue.queue_dma = DMA_ERROR_CODE; 1423 1424 netdev_dbg(netdev, "registering netdev...\n"); 1425 1426 ibmveth_set_features(netdev, netdev->features); 1427 1428 rc = register_netdev(netdev); 1429 1430 if (rc) { 1431 netdev_dbg(netdev, "failed to register netdev rc=%d\n", rc); 1432 free_netdev(netdev); 1433 return rc; 1434 } 1435 1436 netdev_dbg(netdev, "registered\n"); 1437 1438 return 0; 1439} 1440 1441static int ibmveth_remove(struct vio_dev *dev) 1442{ 1443 struct net_device *netdev = dev_get_drvdata(&dev->dev); 1444 struct ibmveth_adapter *adapter = netdev_priv(netdev); 1445 int i; 1446 1447 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) 1448 kobject_put(&adapter->rx_buff_pool[i].kobj); 1449 1450 unregister_netdev(netdev); 1451 1452 free_netdev(netdev); 1453 dev_set_drvdata(&dev->dev, NULL); 1454 1455 return 0; 1456} 1457 1458static struct attribute veth_active_attr; 1459static struct attribute veth_num_attr; 1460static struct attribute veth_size_attr; 1461 1462static ssize_t veth_pool_show(struct kobject *kobj, 1463 struct attribute *attr, char *buf) 1464{ 1465 struct ibmveth_buff_pool *pool = container_of(kobj, 1466 struct ibmveth_buff_pool, 1467 kobj); 1468 1469 if (attr == &veth_active_attr) 1470 return sprintf(buf, "%d\n", pool->active); 1471 else if (attr == &veth_num_attr) 1472 return sprintf(buf, "%d\n", pool->size); 1473 else if (attr == &veth_size_attr) 1474 return sprintf(buf, "%d\n", pool->buff_size); 1475 return 0; 1476} 1477 1478static ssize_t veth_pool_store(struct kobject *kobj, struct attribute *attr, 1479 const char *buf, size_t count) 1480{ 1481 struct ibmveth_buff_pool *pool = container_of(kobj, 1482 struct ibmveth_buff_pool, 1483 kobj); 1484 struct net_device *netdev = dev_get_drvdata( 1485 container_of(kobj->parent, struct device, kobj)); 1486 struct ibmveth_adapter *adapter = netdev_priv(netdev); 1487 long value = simple_strtol(buf, NULL, 10); 1488 long rc; 1489 1490 if (attr == &veth_active_attr) { 1491 if (value && !pool->active) { 1492 if (netif_running(netdev)) { 1493 if (ibmveth_alloc_buffer_pool(pool)) { 1494 netdev_err(netdev, 1495 "unable to alloc pool\n"); 1496 return -ENOMEM; 1497 } 1498 pool->active = 1; 1499 adapter->pool_config = 1; 1500 ibmveth_close(netdev); 1501 adapter->pool_config = 0; 1502 if ((rc = ibmveth_open(netdev))) 1503 return rc; 1504 } else { 1505 pool->active = 1; 1506 } 1507 } else if (!value && pool->active) { 1508 int mtu = netdev->mtu + IBMVETH_BUFF_OH; 1509 int i; 1510 /* Make sure there is a buffer pool with buffers that 1511 can hold a packet of the size of the MTU */ 1512 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) { 1513 if (pool == &adapter->rx_buff_pool[i]) 1514 continue; 1515 if (!adapter->rx_buff_pool[i].active) 1516 continue; 1517 if (mtu <= adapter->rx_buff_pool[i].buff_size) 1518 break; 1519 } 1520 1521 if (i == IBMVETH_NUM_BUFF_POOLS) { 1522 netdev_err(netdev, "no active pool >= MTU\n"); 1523 return -EPERM; 1524 } 1525 1526 if (netif_running(netdev)) { 1527 adapter->pool_config = 1; 1528 ibmveth_close(netdev); 1529 pool->active = 0; 1530 adapter->pool_config = 0; 1531 if ((rc = ibmveth_open(netdev))) 1532 return rc; 1533 } 1534 pool->active = 0; 1535 } 1536 } else if (attr == &veth_num_attr) { 1537 if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT) { 1538 return -EINVAL; 1539 } else { 1540 if (netif_running(netdev)) { 1541 adapter->pool_config = 1; 1542 ibmveth_close(netdev); 1543 adapter->pool_config = 0; 1544 pool->size = value; 1545 if ((rc = ibmveth_open(netdev))) 1546 return rc; 1547 } else { 1548 pool->size = value; 1549 } 1550 } 1551 } else if (attr == &veth_size_attr) { 1552 if (value <= IBMVETH_BUFF_OH || value > IBMVETH_MAX_BUF_SIZE) { 1553 return -EINVAL; 1554 } else { 1555 if (netif_running(netdev)) { 1556 adapter->pool_config = 1; 1557 ibmveth_close(netdev); 1558 adapter->pool_config = 0; 1559 pool->buff_size = value; 1560 if ((rc = ibmveth_open(netdev))) 1561 return rc; 1562 } else { 1563 pool->buff_size = value; 1564 } 1565 } 1566 } 1567 1568 /* kick the interrupt handler to allocate/deallocate pools */ 1569 ibmveth_interrupt(netdev->irq, netdev); 1570 return count; 1571} 1572 1573 1574#define ATTR(_name, _mode) \ 1575 struct attribute veth_##_name##_attr = { \ 1576 .name = __stringify(_name), .mode = _mode, \ 1577 }; 1578 1579static ATTR(active, 0644); 1580static ATTR(num, 0644); 1581static ATTR(size, 0644); 1582 1583static struct attribute *veth_pool_attrs[] = { 1584 &veth_active_attr, 1585 &veth_num_attr, 1586 &veth_size_attr, 1587 NULL, 1588}; 1589 1590static const struct sysfs_ops veth_pool_ops = { 1591 .show = veth_pool_show, 1592 .store = veth_pool_store, 1593}; 1594 1595static struct kobj_type ktype_veth_pool = { 1596 .release = NULL, 1597 .sysfs_ops = &veth_pool_ops, 1598 .default_attrs = veth_pool_attrs, 1599}; 1600 1601static int ibmveth_resume(struct device *dev) 1602{ 1603 struct net_device *netdev = dev_get_drvdata(dev); 1604 ibmveth_interrupt(netdev->irq, netdev); 1605 return 0; 1606} 1607 1608static struct vio_device_id ibmveth_device_table[] = { 1609 { "network", "IBM,l-lan"}, 1610 { "", "" } 1611}; 1612MODULE_DEVICE_TABLE(vio, ibmveth_device_table); 1613 1614static struct dev_pm_ops ibmveth_pm_ops = { 1615 .resume = ibmveth_resume 1616}; 1617 1618static struct vio_driver ibmveth_driver = { 1619 .id_table = ibmveth_device_table, 1620 .probe = ibmveth_probe, 1621 .remove = ibmveth_remove, 1622 .get_desired_dma = ibmveth_get_desired_dma, 1623 .name = ibmveth_driver_name, 1624 .pm = &ibmveth_pm_ops, 1625}; 1626 1627static int __init ibmveth_module_init(void) 1628{ 1629 printk(KERN_DEBUG "%s: %s %s\n", ibmveth_driver_name, 1630 ibmveth_driver_string, ibmveth_driver_version); 1631 1632 return vio_register_driver(&ibmveth_driver); 1633} 1634 1635static void __exit ibmveth_module_exit(void) 1636{ 1637 vio_unregister_driver(&ibmveth_driver); 1638} 1639 1640module_init(ibmveth_module_init); 1641module_exit(ibmveth_module_exit); 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