1 /* 2 * Network-device interface management. 3 * 4 * Copyright (c) 2004-2005, Keir Fraser 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License version 2 8 * as published by the Free Software Foundation; or, when distributed 9 * separately from the Linux kernel or incorporated into other 10 * software packages, subject to the following license: 11 * 12 * Permission is hereby granted, free of charge, to any person obtaining a copy 13 * of this source file (the "Software"), to deal in the Software without 14 * restriction, including without limitation the rights to use, copy, modify, 15 * merge, publish, distribute, sublicense, and/or sell copies of the Software, 16 * and to permit persons to whom the Software is furnished to do so, subject to 17 * the following conditions: 18 * 19 * The above copyright notice and this permission notice shall be included in 20 * all copies or substantial portions of the Software. 21 * 22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 23 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 24 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 25 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 26 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 27 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 28 * IN THE SOFTWARE. 29 */ 30 31 #include "common.h" 32 33 #include <linux/kthread.h> 34 #include <linux/ethtool.h> 35 #include <linux/rtnetlink.h> 36 #include <linux/if_vlan.h> 37 #include <linux/vmalloc.h> 38 39 #include <xen/events.h> 40 #include <asm/xen/hypercall.h> 41 #include <xen/balloon.h> 42 43 #define XENVIF_QUEUE_LENGTH 32 44 #define XENVIF_NAPI_WEIGHT 64 45 46 /* Number of bytes allowed on the internal guest Rx queue. */ 47 #define XENVIF_RX_QUEUE_BYTES (XEN_NETIF_RX_RING_SIZE/2 * PAGE_SIZE) 48 49 /* This function is used to set SKBTX_DEV_ZEROCOPY as well as 50 * increasing the inflight counter. We need to increase the inflight 51 * counter because core driver calls into xenvif_zerocopy_callback 52 * which calls xenvif_skb_zerocopy_complete. 53 */ 54 void xenvif_skb_zerocopy_prepare(struct xenvif_queue *queue, 55 struct sk_buff *skb) 56 { 57 skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY; 58 atomic_inc(&queue->inflight_packets); 59 } 60 61 void xenvif_skb_zerocopy_complete(struct xenvif_queue *queue) 62 { 63 atomic_dec(&queue->inflight_packets); 64 } 65 66 int xenvif_schedulable(struct xenvif *vif) 67 { 68 return netif_running(vif->dev) && 69 test_bit(VIF_STATUS_CONNECTED, &vif->status) && 70 !vif->disabled; 71 } 72 73 static irqreturn_t xenvif_tx_interrupt(int irq, void *dev_id) 74 { 75 struct xenvif_queue *queue = dev_id; 76 77 if (RING_HAS_UNCONSUMED_REQUESTS(&queue->tx)) 78 napi_schedule(&queue->napi); 79 80 return IRQ_HANDLED; 81 } 82 83 int xenvif_poll(struct napi_struct *napi, int budget) 84 { 85 struct xenvif_queue *queue = 86 container_of(napi, struct xenvif_queue, napi); 87 int work_done; 88 89 /* This vif is rogue, we pretend we've there is nothing to do 90 * for this vif to deschedule it from NAPI. But this interface 91 * will be turned off in thread context later. 92 */ 93 if (unlikely(queue->vif->disabled)) { 94 napi_complete(napi); 95 return 0; 96 } 97 98 work_done = xenvif_tx_action(queue, budget); 99 100 if (work_done < budget) { 101 napi_complete(napi); 102 xenvif_napi_schedule_or_enable_events(queue); 103 } 104 105 return work_done; 106 } 107 108 static irqreturn_t xenvif_rx_interrupt(int irq, void *dev_id) 109 { 110 struct xenvif_queue *queue = dev_id; 111 112 xenvif_kick_thread(queue); 113 114 return IRQ_HANDLED; 115 } 116 117 irqreturn_t xenvif_interrupt(int irq, void *dev_id) 118 { 119 xenvif_tx_interrupt(irq, dev_id); 120 xenvif_rx_interrupt(irq, dev_id); 121 122 return IRQ_HANDLED; 123 } 124 125 int xenvif_queue_stopped(struct xenvif_queue *queue) 126 { 127 struct net_device *dev = queue->vif->dev; 128 unsigned int id = queue->id; 129 return netif_tx_queue_stopped(netdev_get_tx_queue(dev, id)); 130 } 131 132 void xenvif_wake_queue(struct xenvif_queue *queue) 133 { 134 struct net_device *dev = queue->vif->dev; 135 unsigned int id = queue->id; 136 netif_tx_wake_queue(netdev_get_tx_queue(dev, id)); 137 } 138 139 static int xenvif_start_xmit(struct sk_buff *skb, struct net_device *dev) 140 { 141 struct xenvif *vif = netdev_priv(dev); 142 struct xenvif_queue *queue = NULL; 143 unsigned int num_queues = vif->num_queues; 144 u16 index; 145 struct xenvif_rx_cb *cb; 146 147 BUG_ON(skb->dev != dev); 148 149 /* Drop the packet if queues are not set up */ 150 if (num_queues < 1) 151 goto drop; 152 153 /* Obtain the queue to be used to transmit this packet */ 154 index = skb_get_queue_mapping(skb); 155 if (index >= num_queues) { 156 pr_warn_ratelimited("Invalid queue %hu for packet on interface %s\n.", 157 index, vif->dev->name); 158 index %= num_queues; 159 } 160 queue = &vif->queues[index]; 161 162 /* Drop the packet if queue is not ready */ 163 if (queue->task == NULL || 164 queue->dealloc_task == NULL || 165 !xenvif_schedulable(vif)) 166 goto drop; 167 168 cb = XENVIF_RX_CB(skb); 169 cb->expires = jiffies + rx_drain_timeout_jiffies; 170 171 xenvif_rx_queue_tail(queue, skb); 172 xenvif_kick_thread(queue); 173 174 return NETDEV_TX_OK; 175 176 drop: 177 vif->dev->stats.tx_dropped++; 178 dev_kfree_skb(skb); 179 return NETDEV_TX_OK; 180 } 181 182 static struct net_device_stats *xenvif_get_stats(struct net_device *dev) 183 { 184 struct xenvif *vif = netdev_priv(dev); 185 struct xenvif_queue *queue = NULL; 186 unsigned int num_queues = vif->num_queues; 187 unsigned long rx_bytes = 0; 188 unsigned long rx_packets = 0; 189 unsigned long tx_bytes = 0; 190 unsigned long tx_packets = 0; 191 unsigned int index; 192 193 if (vif->queues == NULL) 194 goto out; 195 196 /* Aggregate tx and rx stats from each queue */ 197 for (index = 0; index < num_queues; ++index) { 198 queue = &vif->queues[index]; 199 rx_bytes += queue->stats.rx_bytes; 200 rx_packets += queue->stats.rx_packets; 201 tx_bytes += queue->stats.tx_bytes; 202 tx_packets += queue->stats.tx_packets; 203 } 204 205 out: 206 vif->dev->stats.rx_bytes = rx_bytes; 207 vif->dev->stats.rx_packets = rx_packets; 208 vif->dev->stats.tx_bytes = tx_bytes; 209 vif->dev->stats.tx_packets = tx_packets; 210 211 return &vif->dev->stats; 212 } 213 214 static void xenvif_up(struct xenvif *vif) 215 { 216 struct xenvif_queue *queue = NULL; 217 unsigned int num_queues = vif->num_queues; 218 unsigned int queue_index; 219 220 for (queue_index = 0; queue_index < num_queues; ++queue_index) { 221 queue = &vif->queues[queue_index]; 222 napi_enable(&queue->napi); 223 enable_irq(queue->tx_irq); 224 if (queue->tx_irq != queue->rx_irq) 225 enable_irq(queue->rx_irq); 226 xenvif_napi_schedule_or_enable_events(queue); 227 } 228 } 229 230 static void xenvif_down(struct xenvif *vif) 231 { 232 struct xenvif_queue *queue = NULL; 233 unsigned int num_queues = vif->num_queues; 234 unsigned int queue_index; 235 236 for (queue_index = 0; queue_index < num_queues; ++queue_index) { 237 queue = &vif->queues[queue_index]; 238 napi_disable(&queue->napi); 239 disable_irq(queue->tx_irq); 240 if (queue->tx_irq != queue->rx_irq) 241 disable_irq(queue->rx_irq); 242 del_timer_sync(&queue->credit_timeout); 243 } 244 } 245 246 static int xenvif_open(struct net_device *dev) 247 { 248 struct xenvif *vif = netdev_priv(dev); 249 if (test_bit(VIF_STATUS_CONNECTED, &vif->status)) 250 xenvif_up(vif); 251 netif_tx_start_all_queues(dev); 252 return 0; 253 } 254 255 static int xenvif_close(struct net_device *dev) 256 { 257 struct xenvif *vif = netdev_priv(dev); 258 if (test_bit(VIF_STATUS_CONNECTED, &vif->status)) 259 xenvif_down(vif); 260 netif_tx_stop_all_queues(dev); 261 return 0; 262 } 263 264 static int xenvif_change_mtu(struct net_device *dev, int mtu) 265 { 266 struct xenvif *vif = netdev_priv(dev); 267 int max = vif->can_sg ? 65535 - VLAN_ETH_HLEN : ETH_DATA_LEN; 268 269 if (mtu > max) 270 return -EINVAL; 271 dev->mtu = mtu; 272 return 0; 273 } 274 275 static netdev_features_t xenvif_fix_features(struct net_device *dev, 276 netdev_features_t features) 277 { 278 struct xenvif *vif = netdev_priv(dev); 279 280 if (!vif->can_sg) 281 features &= ~NETIF_F_SG; 282 if (~(vif->gso_mask | vif->gso_prefix_mask) & GSO_BIT(TCPV4)) 283 features &= ~NETIF_F_TSO; 284 if (~(vif->gso_mask | vif->gso_prefix_mask) & GSO_BIT(TCPV6)) 285 features &= ~NETIF_F_TSO6; 286 if (!vif->ip_csum) 287 features &= ~NETIF_F_IP_CSUM; 288 if (!vif->ipv6_csum) 289 features &= ~NETIF_F_IPV6_CSUM; 290 291 return features; 292 } 293 294 static const struct xenvif_stat { 295 char name[ETH_GSTRING_LEN]; 296 u16 offset; 297 } xenvif_stats[] = { 298 { 299 "rx_gso_checksum_fixup", 300 offsetof(struct xenvif_stats, rx_gso_checksum_fixup) 301 }, 302 /* If (sent != success + fail), there are probably packets never 303 * freed up properly! 304 */ 305 { 306 "tx_zerocopy_sent", 307 offsetof(struct xenvif_stats, tx_zerocopy_sent), 308 }, 309 { 310 "tx_zerocopy_success", 311 offsetof(struct xenvif_stats, tx_zerocopy_success), 312 }, 313 { 314 "tx_zerocopy_fail", 315 offsetof(struct xenvif_stats, tx_zerocopy_fail) 316 }, 317 /* Number of packets exceeding MAX_SKB_FRAG slots. You should use 318 * a guest with the same MAX_SKB_FRAG 319 */ 320 { 321 "tx_frag_overflow", 322 offsetof(struct xenvif_stats, tx_frag_overflow) 323 }, 324 }; 325 326 static int xenvif_get_sset_count(struct net_device *dev, int string_set) 327 { 328 switch (string_set) { 329 case ETH_SS_STATS: 330 return ARRAY_SIZE(xenvif_stats); 331 default: 332 return -EINVAL; 333 } 334 } 335 336 static void xenvif_get_ethtool_stats(struct net_device *dev, 337 struct ethtool_stats *stats, u64 * data) 338 { 339 struct xenvif *vif = netdev_priv(dev); 340 unsigned int num_queues = vif->num_queues; 341 int i; 342 unsigned int queue_index; 343 struct xenvif_stats *vif_stats; 344 345 for (i = 0; i < ARRAY_SIZE(xenvif_stats); i++) { 346 unsigned long accum = 0; 347 for (queue_index = 0; queue_index < num_queues; ++queue_index) { 348 vif_stats = &vif->queues[queue_index].stats; 349 accum += *(unsigned long *)(vif_stats + xenvif_stats[i].offset); 350 } 351 data[i] = accum; 352 } 353 } 354 355 static void xenvif_get_strings(struct net_device *dev, u32 stringset, u8 * data) 356 { 357 int i; 358 359 switch (stringset) { 360 case ETH_SS_STATS: 361 for (i = 0; i < ARRAY_SIZE(xenvif_stats); i++) 362 memcpy(data + i * ETH_GSTRING_LEN, 363 xenvif_stats[i].name, ETH_GSTRING_LEN); 364 break; 365 } 366 } 367 368 static const struct ethtool_ops xenvif_ethtool_ops = { 369 .get_link = ethtool_op_get_link, 370 371 .get_sset_count = xenvif_get_sset_count, 372 .get_ethtool_stats = xenvif_get_ethtool_stats, 373 .get_strings = xenvif_get_strings, 374 }; 375 376 static const struct net_device_ops xenvif_netdev_ops = { 377 .ndo_start_xmit = xenvif_start_xmit, 378 .ndo_get_stats = xenvif_get_stats, 379 .ndo_open = xenvif_open, 380 .ndo_stop = xenvif_close, 381 .ndo_change_mtu = xenvif_change_mtu, 382 .ndo_fix_features = xenvif_fix_features, 383 .ndo_set_mac_address = eth_mac_addr, 384 .ndo_validate_addr = eth_validate_addr, 385 }; 386 387 struct xenvif *xenvif_alloc(struct device *parent, domid_t domid, 388 unsigned int handle) 389 { 390 int err; 391 struct net_device *dev; 392 struct xenvif *vif; 393 char name[IFNAMSIZ] = {}; 394 395 snprintf(name, IFNAMSIZ - 1, "vif%u.%u", domid, handle); 396 /* Allocate a netdev with the max. supported number of queues. 397 * When the guest selects the desired number, it will be updated 398 * via netif_set_real_num_*_queues(). 399 */ 400 dev = alloc_netdev_mq(sizeof(struct xenvif), name, NET_NAME_UNKNOWN, 401 ether_setup, xenvif_max_queues); 402 if (dev == NULL) { 403 pr_warn("Could not allocate netdev for %s\n", name); 404 return ERR_PTR(-ENOMEM); 405 } 406 407 SET_NETDEV_DEV(dev, parent); 408 409 vif = netdev_priv(dev); 410 411 vif->domid = domid; 412 vif->handle = handle; 413 vif->can_sg = 1; 414 vif->ip_csum = 1; 415 vif->dev = dev; 416 vif->disabled = false; 417 418 /* Start out with no queues. */ 419 vif->queues = NULL; 420 vif->num_queues = 0; 421 422 spin_lock_init(&vif->lock); 423 424 dev->netdev_ops = &xenvif_netdev_ops; 425 dev->hw_features = NETIF_F_SG | 426 NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM | 427 NETIF_F_TSO | NETIF_F_TSO6; 428 dev->features = dev->hw_features | NETIF_F_RXCSUM; 429 dev->ethtool_ops = &xenvif_ethtool_ops; 430 431 dev->tx_queue_len = XENVIF_QUEUE_LENGTH; 432 433 /* 434 * Initialise a dummy MAC address. We choose the numerically 435 * largest non-broadcast address to prevent the address getting 436 * stolen by an Ethernet bridge for STP purposes. 437 * (FE:FF:FF:FF:FF:FF) 438 */ 439 memset(dev->dev_addr, 0xFF, ETH_ALEN); 440 dev->dev_addr[0] &= ~0x01; 441 442 netif_carrier_off(dev); 443 444 err = register_netdev(dev); 445 if (err) { 446 netdev_warn(dev, "Could not register device: err=%d\n", err); 447 free_netdev(dev); 448 return ERR_PTR(err); 449 } 450 451 netdev_dbg(dev, "Successfully created xenvif\n"); 452 453 __module_get(THIS_MODULE); 454 455 return vif; 456 } 457 458 int xenvif_init_queue(struct xenvif_queue *queue) 459 { 460 int err, i; 461 462 queue->credit_bytes = queue->remaining_credit = ~0UL; 463 queue->credit_usec = 0UL; 464 init_timer(&queue->credit_timeout); 465 queue->credit_window_start = get_jiffies_64(); 466 467 queue->rx_queue_max = XENVIF_RX_QUEUE_BYTES; 468 469 skb_queue_head_init(&queue->rx_queue); 470 skb_queue_head_init(&queue->tx_queue); 471 472 queue->pending_cons = 0; 473 queue->pending_prod = MAX_PENDING_REQS; 474 for (i = 0; i < MAX_PENDING_REQS; ++i) 475 queue->pending_ring[i] = i; 476 477 spin_lock_init(&queue->callback_lock); 478 spin_lock_init(&queue->response_lock); 479 480 /* If ballooning is disabled, this will consume real memory, so you 481 * better enable it. The long term solution would be to use just a 482 * bunch of valid page descriptors, without dependency on ballooning 483 */ 484 err = alloc_xenballooned_pages(MAX_PENDING_REQS, 485 queue->mmap_pages, 486 false); 487 if (err) { 488 netdev_err(queue->vif->dev, "Could not reserve mmap_pages\n"); 489 return -ENOMEM; 490 } 491 492 for (i = 0; i < MAX_PENDING_REQS; i++) { 493 queue->pending_tx_info[i].callback_struct = (struct ubuf_info) 494 { .callback = xenvif_zerocopy_callback, 495 .ctx = NULL, 496 .desc = i }; 497 queue->grant_tx_handle[i] = NETBACK_INVALID_HANDLE; 498 } 499 500 return 0; 501 } 502 503 void xenvif_carrier_on(struct xenvif *vif) 504 { 505 rtnl_lock(); 506 if (!vif->can_sg && vif->dev->mtu > ETH_DATA_LEN) 507 dev_set_mtu(vif->dev, ETH_DATA_LEN); 508 netdev_update_features(vif->dev); 509 set_bit(VIF_STATUS_CONNECTED, &vif->status); 510 if (netif_running(vif->dev)) 511 xenvif_up(vif); 512 rtnl_unlock(); 513 } 514 515 int xenvif_connect(struct xenvif_queue *queue, unsigned long tx_ring_ref, 516 unsigned long rx_ring_ref, unsigned int tx_evtchn, 517 unsigned int rx_evtchn) 518 { 519 struct task_struct *task; 520 int err = -ENOMEM; 521 522 BUG_ON(queue->tx_irq); 523 BUG_ON(queue->task); 524 BUG_ON(queue->dealloc_task); 525 526 err = xenvif_map_frontend_rings(queue, tx_ring_ref, rx_ring_ref); 527 if (err < 0) 528 goto err; 529 530 init_waitqueue_head(&queue->wq); 531 init_waitqueue_head(&queue->dealloc_wq); 532 atomic_set(&queue->inflight_packets, 0); 533 534 netif_napi_add(queue->vif->dev, &queue->napi, xenvif_poll, 535 XENVIF_NAPI_WEIGHT); 536 537 if (tx_evtchn == rx_evtchn) { 538 /* feature-split-event-channels == 0 */ 539 err = bind_interdomain_evtchn_to_irqhandler( 540 queue->vif->domid, tx_evtchn, xenvif_interrupt, 0, 541 queue->name, queue); 542 if (err < 0) 543 goto err_unmap; 544 queue->tx_irq = queue->rx_irq = err; 545 disable_irq(queue->tx_irq); 546 } else { 547 /* feature-split-event-channels == 1 */ 548 snprintf(queue->tx_irq_name, sizeof(queue->tx_irq_name), 549 "%s-tx", queue->name); 550 err = bind_interdomain_evtchn_to_irqhandler( 551 queue->vif->domid, tx_evtchn, xenvif_tx_interrupt, 0, 552 queue->tx_irq_name, queue); 553 if (err < 0) 554 goto err_unmap; 555 queue->tx_irq = err; 556 disable_irq(queue->tx_irq); 557 558 snprintf(queue->rx_irq_name, sizeof(queue->rx_irq_name), 559 "%s-rx", queue->name); 560 err = bind_interdomain_evtchn_to_irqhandler( 561 queue->vif->domid, rx_evtchn, xenvif_rx_interrupt, 0, 562 queue->rx_irq_name, queue); 563 if (err < 0) 564 goto err_tx_unbind; 565 queue->rx_irq = err; 566 disable_irq(queue->rx_irq); 567 } 568 569 queue->stalled = true; 570 571 task = kthread_create(xenvif_kthread_guest_rx, 572 (void *)queue, "%s-guest-rx", queue->name); 573 if (IS_ERR(task)) { 574 pr_warn("Could not allocate kthread for %s\n", queue->name); 575 err = PTR_ERR(task); 576 goto err_rx_unbind; 577 } 578 queue->task = task; 579 580 task = kthread_create(xenvif_dealloc_kthread, 581 (void *)queue, "%s-dealloc", queue->name); 582 if (IS_ERR(task)) { 583 pr_warn("Could not allocate kthread for %s\n", queue->name); 584 err = PTR_ERR(task); 585 goto err_rx_unbind; 586 } 587 queue->dealloc_task = task; 588 589 wake_up_process(queue->task); 590 wake_up_process(queue->dealloc_task); 591 592 return 0; 593 594 err_rx_unbind: 595 unbind_from_irqhandler(queue->rx_irq, queue); 596 queue->rx_irq = 0; 597 err_tx_unbind: 598 unbind_from_irqhandler(queue->tx_irq, queue); 599 queue->tx_irq = 0; 600 err_unmap: 601 xenvif_unmap_frontend_rings(queue); 602 err: 603 module_put(THIS_MODULE); 604 return err; 605 } 606 607 void xenvif_carrier_off(struct xenvif *vif) 608 { 609 struct net_device *dev = vif->dev; 610 611 rtnl_lock(); 612 if (test_and_clear_bit(VIF_STATUS_CONNECTED, &vif->status)) { 613 netif_carrier_off(dev); /* discard queued packets */ 614 if (netif_running(dev)) 615 xenvif_down(vif); 616 } 617 rtnl_unlock(); 618 } 619 620 void xenvif_disconnect(struct xenvif *vif) 621 { 622 struct xenvif_queue *queue = NULL; 623 unsigned int num_queues = vif->num_queues; 624 unsigned int queue_index; 625 626 xenvif_carrier_off(vif); 627 628 for (queue_index = 0; queue_index < num_queues; ++queue_index) { 629 queue = &vif->queues[queue_index]; 630 631 netif_napi_del(&queue->napi); 632 633 if (queue->task) { 634 kthread_stop(queue->task); 635 queue->task = NULL; 636 } 637 638 if (queue->dealloc_task) { 639 kthread_stop(queue->dealloc_task); 640 queue->dealloc_task = NULL; 641 } 642 643 if (queue->tx_irq) { 644 if (queue->tx_irq == queue->rx_irq) 645 unbind_from_irqhandler(queue->tx_irq, queue); 646 else { 647 unbind_from_irqhandler(queue->tx_irq, queue); 648 unbind_from_irqhandler(queue->rx_irq, queue); 649 } 650 queue->tx_irq = 0; 651 } 652 653 xenvif_unmap_frontend_rings(queue); 654 } 655 } 656 657 /* Reverse the relevant parts of xenvif_init_queue(). 658 * Used for queue teardown from xenvif_free(), and on the 659 * error handling paths in xenbus.c:connect(). 660 */ 661 void xenvif_deinit_queue(struct xenvif_queue *queue) 662 { 663 free_xenballooned_pages(MAX_PENDING_REQS, queue->mmap_pages); 664 } 665 666 void xenvif_free(struct xenvif *vif) 667 { 668 struct xenvif_queue *queue = NULL; 669 unsigned int num_queues = vif->num_queues; 670 unsigned int queue_index; 671 672 unregister_netdev(vif->dev); 673 674 for (queue_index = 0; queue_index < num_queues; ++queue_index) { 675 queue = &vif->queues[queue_index]; 676 xenvif_deinit_queue(queue); 677 } 678 679 vfree(vif->queues); 680 vif->queues = NULL; 681 vif->num_queues = 0; 682 683 free_netdev(vif->dev); 684 685 module_put(THIS_MODULE); 686 } 687