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 /* This function is used to set SKBTX_DEV_ZEROCOPY as well as 47 * increasing the inflight counter. We need to increase the inflight 48 * counter because core driver calls into xenvif_zerocopy_callback 49 * which calls xenvif_skb_zerocopy_complete. 50 */ 51 void xenvif_skb_zerocopy_prepare(struct xenvif_queue *queue, 52 struct sk_buff *skb) 53 { 54 skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY; 55 atomic_inc(&queue->inflight_packets); 56 } 57 58 void xenvif_skb_zerocopy_complete(struct xenvif_queue *queue) 59 { 60 atomic_dec(&queue->inflight_packets); 61 } 62 63 static inline void xenvif_stop_queue(struct xenvif_queue *queue) 64 { 65 struct net_device *dev = queue->vif->dev; 66 67 if (!queue->vif->can_queue) 68 return; 69 70 netif_tx_stop_queue(netdev_get_tx_queue(dev, queue->id)); 71 } 72 73 int xenvif_schedulable(struct xenvif *vif) 74 { 75 return netif_running(vif->dev) && 76 test_bit(VIF_STATUS_CONNECTED, &vif->status); 77 } 78 79 static irqreturn_t xenvif_tx_interrupt(int irq, void *dev_id) 80 { 81 struct xenvif_queue *queue = dev_id; 82 83 if (RING_HAS_UNCONSUMED_REQUESTS(&queue->tx)) 84 napi_schedule(&queue->napi); 85 86 return IRQ_HANDLED; 87 } 88 89 int xenvif_poll(struct napi_struct *napi, int budget) 90 { 91 struct xenvif_queue *queue = 92 container_of(napi, struct xenvif_queue, napi); 93 int work_done; 94 95 /* This vif is rogue, we pretend we've there is nothing to do 96 * for this vif to deschedule it from NAPI. But this interface 97 * will be turned off in thread context later. 98 */ 99 if (unlikely(queue->vif->disabled)) { 100 napi_complete(napi); 101 return 0; 102 } 103 104 work_done = xenvif_tx_action(queue, budget); 105 106 if (work_done < budget) { 107 napi_complete(napi); 108 xenvif_napi_schedule_or_enable_events(queue); 109 } 110 111 return work_done; 112 } 113 114 static irqreturn_t xenvif_rx_interrupt(int irq, void *dev_id) 115 { 116 struct xenvif_queue *queue = dev_id; 117 struct netdev_queue *net_queue = 118 netdev_get_tx_queue(queue->vif->dev, queue->id); 119 120 /* QUEUE_STATUS_RX_PURGE_EVENT is only set if either QDisc was off OR 121 * the carrier went down and this queue was previously blocked 122 */ 123 if (unlikely(netif_tx_queue_stopped(net_queue) || 124 (!netif_carrier_ok(queue->vif->dev) && 125 test_bit(QUEUE_STATUS_RX_STALLED, &queue->status)))) 126 set_bit(QUEUE_STATUS_RX_PURGE_EVENT, &queue->status); 127 xenvif_kick_thread(queue); 128 129 return IRQ_HANDLED; 130 } 131 132 irqreturn_t xenvif_interrupt(int irq, void *dev_id) 133 { 134 xenvif_tx_interrupt(irq, dev_id); 135 xenvif_rx_interrupt(irq, dev_id); 136 137 return IRQ_HANDLED; 138 } 139 140 int xenvif_queue_stopped(struct xenvif_queue *queue) 141 { 142 struct net_device *dev = queue->vif->dev; 143 unsigned int id = queue->id; 144 return netif_tx_queue_stopped(netdev_get_tx_queue(dev, id)); 145 } 146 147 void xenvif_wake_queue(struct xenvif_queue *queue) 148 { 149 struct net_device *dev = queue->vif->dev; 150 unsigned int id = queue->id; 151 netif_tx_wake_queue(netdev_get_tx_queue(dev, id)); 152 } 153 154 /* Callback to wake the queue's thread and turn the carrier off on timeout */ 155 static void xenvif_rx_stalled(unsigned long data) 156 { 157 struct xenvif_queue *queue = (struct xenvif_queue *)data; 158 159 if (xenvif_queue_stopped(queue)) { 160 set_bit(QUEUE_STATUS_RX_PURGE_EVENT, &queue->status); 161 xenvif_kick_thread(queue); 162 } 163 } 164 165 static int xenvif_start_xmit(struct sk_buff *skb, struct net_device *dev) 166 { 167 struct xenvif *vif = netdev_priv(dev); 168 struct xenvif_queue *queue = NULL; 169 unsigned int num_queues = vif->num_queues; 170 u16 index; 171 int min_slots_needed; 172 173 BUG_ON(skb->dev != dev); 174 175 /* Drop the packet if queues are not set up */ 176 if (num_queues < 1) 177 goto drop; 178 179 /* Obtain the queue to be used to transmit this packet */ 180 index = skb_get_queue_mapping(skb); 181 if (index >= num_queues) { 182 pr_warn_ratelimited("Invalid queue %hu for packet on interface %s\n.", 183 index, vif->dev->name); 184 index %= num_queues; 185 } 186 queue = &vif->queues[index]; 187 188 /* Drop the packet if queue is not ready */ 189 if (queue->task == NULL || 190 queue->dealloc_task == NULL || 191 !xenvif_schedulable(vif)) 192 goto drop; 193 194 /* At best we'll need one slot for the header and one for each 195 * frag. 196 */ 197 min_slots_needed = 1 + skb_shinfo(skb)->nr_frags; 198 199 /* If the skb is GSO then we'll also need an extra slot for the 200 * metadata. 201 */ 202 if (skb_is_gso(skb)) 203 min_slots_needed++; 204 205 /* If the skb can't possibly fit in the remaining slots 206 * then turn off the queue to give the ring a chance to 207 * drain. 208 */ 209 if (!xenvif_rx_ring_slots_available(queue, min_slots_needed)) { 210 queue->rx_stalled.function = xenvif_rx_stalled; 211 queue->rx_stalled.data = (unsigned long)queue; 212 xenvif_stop_queue(queue); 213 mod_timer(&queue->rx_stalled, 214 jiffies + rx_drain_timeout_jiffies); 215 } 216 217 skb_queue_tail(&queue->rx_queue, skb); 218 xenvif_kick_thread(queue); 219 220 return NETDEV_TX_OK; 221 222 drop: 223 vif->dev->stats.tx_dropped++; 224 dev_kfree_skb(skb); 225 return NETDEV_TX_OK; 226 } 227 228 static struct net_device_stats *xenvif_get_stats(struct net_device *dev) 229 { 230 struct xenvif *vif = netdev_priv(dev); 231 struct xenvif_queue *queue = NULL; 232 unsigned int num_queues = vif->num_queues; 233 unsigned long rx_bytes = 0; 234 unsigned long rx_packets = 0; 235 unsigned long tx_bytes = 0; 236 unsigned long tx_packets = 0; 237 unsigned int index; 238 239 if (vif->queues == NULL) 240 goto out; 241 242 /* Aggregate tx and rx stats from each queue */ 243 for (index = 0; index < num_queues; ++index) { 244 queue = &vif->queues[index]; 245 rx_bytes += queue->stats.rx_bytes; 246 rx_packets += queue->stats.rx_packets; 247 tx_bytes += queue->stats.tx_bytes; 248 tx_packets += queue->stats.tx_packets; 249 } 250 251 out: 252 vif->dev->stats.rx_bytes = rx_bytes; 253 vif->dev->stats.rx_packets = rx_packets; 254 vif->dev->stats.tx_bytes = tx_bytes; 255 vif->dev->stats.tx_packets = tx_packets; 256 257 return &vif->dev->stats; 258 } 259 260 static void xenvif_up(struct xenvif *vif) 261 { 262 struct xenvif_queue *queue = NULL; 263 unsigned int num_queues = vif->num_queues; 264 unsigned int queue_index; 265 266 for (queue_index = 0; queue_index < num_queues; ++queue_index) { 267 queue = &vif->queues[queue_index]; 268 napi_enable(&queue->napi); 269 enable_irq(queue->tx_irq); 270 if (queue->tx_irq != queue->rx_irq) 271 enable_irq(queue->rx_irq); 272 xenvif_napi_schedule_or_enable_events(queue); 273 } 274 } 275 276 static void xenvif_down(struct xenvif *vif) 277 { 278 struct xenvif_queue *queue = NULL; 279 unsigned int num_queues = vif->num_queues; 280 unsigned int queue_index; 281 282 for (queue_index = 0; queue_index < num_queues; ++queue_index) { 283 queue = &vif->queues[queue_index]; 284 napi_disable(&queue->napi); 285 disable_irq(queue->tx_irq); 286 if (queue->tx_irq != queue->rx_irq) 287 disable_irq(queue->rx_irq); 288 del_timer_sync(&queue->credit_timeout); 289 } 290 } 291 292 static int xenvif_open(struct net_device *dev) 293 { 294 struct xenvif *vif = netdev_priv(dev); 295 if (test_bit(VIF_STATUS_CONNECTED, &vif->status)) 296 xenvif_up(vif); 297 netif_tx_start_all_queues(dev); 298 return 0; 299 } 300 301 static int xenvif_close(struct net_device *dev) 302 { 303 struct xenvif *vif = netdev_priv(dev); 304 if (test_bit(VIF_STATUS_CONNECTED, &vif->status)) 305 xenvif_down(vif); 306 netif_tx_stop_all_queues(dev); 307 return 0; 308 } 309 310 static int xenvif_change_mtu(struct net_device *dev, int mtu) 311 { 312 struct xenvif *vif = netdev_priv(dev); 313 int max = vif->can_sg ? 65535 - VLAN_ETH_HLEN : ETH_DATA_LEN; 314 315 if (mtu > max) 316 return -EINVAL; 317 dev->mtu = mtu; 318 return 0; 319 } 320 321 static netdev_features_t xenvif_fix_features(struct net_device *dev, 322 netdev_features_t features) 323 { 324 struct xenvif *vif = netdev_priv(dev); 325 326 if (!vif->can_sg) 327 features &= ~NETIF_F_SG; 328 if (~(vif->gso_mask | vif->gso_prefix_mask) & GSO_BIT(TCPV4)) 329 features &= ~NETIF_F_TSO; 330 if (~(vif->gso_mask | vif->gso_prefix_mask) & GSO_BIT(TCPV6)) 331 features &= ~NETIF_F_TSO6; 332 if (!vif->ip_csum) 333 features &= ~NETIF_F_IP_CSUM; 334 if (!vif->ipv6_csum) 335 features &= ~NETIF_F_IPV6_CSUM; 336 337 return features; 338 } 339 340 static const struct xenvif_stat { 341 char name[ETH_GSTRING_LEN]; 342 u16 offset; 343 } xenvif_stats[] = { 344 { 345 "rx_gso_checksum_fixup", 346 offsetof(struct xenvif_stats, rx_gso_checksum_fixup) 347 }, 348 /* If (sent != success + fail), there are probably packets never 349 * freed up properly! 350 */ 351 { 352 "tx_zerocopy_sent", 353 offsetof(struct xenvif_stats, tx_zerocopy_sent), 354 }, 355 { 356 "tx_zerocopy_success", 357 offsetof(struct xenvif_stats, tx_zerocopy_success), 358 }, 359 { 360 "tx_zerocopy_fail", 361 offsetof(struct xenvif_stats, tx_zerocopy_fail) 362 }, 363 /* Number of packets exceeding MAX_SKB_FRAG slots. You should use 364 * a guest with the same MAX_SKB_FRAG 365 */ 366 { 367 "tx_frag_overflow", 368 offsetof(struct xenvif_stats, tx_frag_overflow) 369 }, 370 }; 371 372 static int xenvif_get_sset_count(struct net_device *dev, int string_set) 373 { 374 switch (string_set) { 375 case ETH_SS_STATS: 376 return ARRAY_SIZE(xenvif_stats); 377 default: 378 return -EINVAL; 379 } 380 } 381 382 static void xenvif_get_ethtool_stats(struct net_device *dev, 383 struct ethtool_stats *stats, u64 * data) 384 { 385 struct xenvif *vif = netdev_priv(dev); 386 unsigned int num_queues = vif->num_queues; 387 int i; 388 unsigned int queue_index; 389 struct xenvif_stats *vif_stats; 390 391 for (i = 0; i < ARRAY_SIZE(xenvif_stats); i++) { 392 unsigned long accum = 0; 393 for (queue_index = 0; queue_index < num_queues; ++queue_index) { 394 vif_stats = &vif->queues[queue_index].stats; 395 accum += *(unsigned long *)(vif_stats + xenvif_stats[i].offset); 396 } 397 data[i] = accum; 398 } 399 } 400 401 static void xenvif_get_strings(struct net_device *dev, u32 stringset, u8 * data) 402 { 403 int i; 404 405 switch (stringset) { 406 case ETH_SS_STATS: 407 for (i = 0; i < ARRAY_SIZE(xenvif_stats); i++) 408 memcpy(data + i * ETH_GSTRING_LEN, 409 xenvif_stats[i].name, ETH_GSTRING_LEN); 410 break; 411 } 412 } 413 414 static const struct ethtool_ops xenvif_ethtool_ops = { 415 .get_link = ethtool_op_get_link, 416 417 .get_sset_count = xenvif_get_sset_count, 418 .get_ethtool_stats = xenvif_get_ethtool_stats, 419 .get_strings = xenvif_get_strings, 420 }; 421 422 static const struct net_device_ops xenvif_netdev_ops = { 423 .ndo_start_xmit = xenvif_start_xmit, 424 .ndo_get_stats = xenvif_get_stats, 425 .ndo_open = xenvif_open, 426 .ndo_stop = xenvif_close, 427 .ndo_change_mtu = xenvif_change_mtu, 428 .ndo_fix_features = xenvif_fix_features, 429 .ndo_set_mac_address = eth_mac_addr, 430 .ndo_validate_addr = eth_validate_addr, 431 }; 432 433 struct xenvif *xenvif_alloc(struct device *parent, domid_t domid, 434 unsigned int handle) 435 { 436 int err; 437 struct net_device *dev; 438 struct xenvif *vif; 439 char name[IFNAMSIZ] = {}; 440 441 snprintf(name, IFNAMSIZ - 1, "vif%u.%u", domid, handle); 442 /* Allocate a netdev with the max. supported number of queues. 443 * When the guest selects the desired number, it will be updated 444 * via netif_set_real_num_*_queues(). 445 */ 446 dev = alloc_netdev_mq(sizeof(struct xenvif), name, NET_NAME_UNKNOWN, 447 ether_setup, xenvif_max_queues); 448 if (dev == NULL) { 449 pr_warn("Could not allocate netdev for %s\n", name); 450 return ERR_PTR(-ENOMEM); 451 } 452 453 SET_NETDEV_DEV(dev, parent); 454 455 vif = netdev_priv(dev); 456 457 vif->domid = domid; 458 vif->handle = handle; 459 vif->can_sg = 1; 460 vif->ip_csum = 1; 461 vif->dev = dev; 462 vif->disabled = false; 463 464 /* Start out with no queues. */ 465 vif->queues = NULL; 466 vif->num_queues = 0; 467 468 dev->netdev_ops = &xenvif_netdev_ops; 469 dev->hw_features = NETIF_F_SG | 470 NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM | 471 NETIF_F_TSO | NETIF_F_TSO6; 472 dev->features = dev->hw_features | NETIF_F_RXCSUM; 473 dev->ethtool_ops = &xenvif_ethtool_ops; 474 475 dev->tx_queue_len = XENVIF_QUEUE_LENGTH; 476 477 /* 478 * Initialise a dummy MAC address. We choose the numerically 479 * largest non-broadcast address to prevent the address getting 480 * stolen by an Ethernet bridge for STP purposes. 481 * (FE:FF:FF:FF:FF:FF) 482 */ 483 memset(dev->dev_addr, 0xFF, ETH_ALEN); 484 dev->dev_addr[0] &= ~0x01; 485 486 netif_carrier_off(dev); 487 488 err = register_netdev(dev); 489 if (err) { 490 netdev_warn(dev, "Could not register device: err=%d\n", err); 491 free_netdev(dev); 492 return ERR_PTR(err); 493 } 494 495 netdev_dbg(dev, "Successfully created xenvif\n"); 496 497 __module_get(THIS_MODULE); 498 499 return vif; 500 } 501 502 int xenvif_init_queue(struct xenvif_queue *queue) 503 { 504 int err, i; 505 506 queue->credit_bytes = queue->remaining_credit = ~0UL; 507 queue->credit_usec = 0UL; 508 init_timer(&queue->credit_timeout); 509 queue->credit_window_start = get_jiffies_64(); 510 511 skb_queue_head_init(&queue->rx_queue); 512 skb_queue_head_init(&queue->tx_queue); 513 514 queue->pending_cons = 0; 515 queue->pending_prod = MAX_PENDING_REQS; 516 for (i = 0; i < MAX_PENDING_REQS; ++i) 517 queue->pending_ring[i] = i; 518 519 spin_lock_init(&queue->callback_lock); 520 spin_lock_init(&queue->response_lock); 521 522 /* If ballooning is disabled, this will consume real memory, so you 523 * better enable it. The long term solution would be to use just a 524 * bunch of valid page descriptors, without dependency on ballooning 525 */ 526 err = alloc_xenballooned_pages(MAX_PENDING_REQS, 527 queue->mmap_pages, 528 false); 529 if (err) { 530 netdev_err(queue->vif->dev, "Could not reserve mmap_pages\n"); 531 return -ENOMEM; 532 } 533 534 for (i = 0; i < MAX_PENDING_REQS; i++) { 535 queue->pending_tx_info[i].callback_struct = (struct ubuf_info) 536 { .callback = xenvif_zerocopy_callback, 537 .ctx = NULL, 538 .desc = i }; 539 queue->grant_tx_handle[i] = NETBACK_INVALID_HANDLE; 540 } 541 542 init_timer(&queue->rx_stalled); 543 544 return 0; 545 } 546 547 void xenvif_carrier_on(struct xenvif *vif) 548 { 549 rtnl_lock(); 550 if (!vif->can_sg && vif->dev->mtu > ETH_DATA_LEN) 551 dev_set_mtu(vif->dev, ETH_DATA_LEN); 552 netdev_update_features(vif->dev); 553 set_bit(VIF_STATUS_CONNECTED, &vif->status); 554 netif_carrier_on(vif->dev); 555 if (netif_running(vif->dev)) 556 xenvif_up(vif); 557 rtnl_unlock(); 558 } 559 560 int xenvif_connect(struct xenvif_queue *queue, unsigned long tx_ring_ref, 561 unsigned long rx_ring_ref, unsigned int tx_evtchn, 562 unsigned int rx_evtchn) 563 { 564 struct task_struct *task; 565 int err = -ENOMEM; 566 567 BUG_ON(queue->tx_irq); 568 BUG_ON(queue->task); 569 BUG_ON(queue->dealloc_task); 570 571 err = xenvif_map_frontend_rings(queue, tx_ring_ref, rx_ring_ref); 572 if (err < 0) 573 goto err; 574 575 init_waitqueue_head(&queue->wq); 576 init_waitqueue_head(&queue->dealloc_wq); 577 atomic_set(&queue->inflight_packets, 0); 578 579 if (tx_evtchn == rx_evtchn) { 580 /* feature-split-event-channels == 0 */ 581 err = bind_interdomain_evtchn_to_irqhandler( 582 queue->vif->domid, tx_evtchn, xenvif_interrupt, 0, 583 queue->name, queue); 584 if (err < 0) 585 goto err_unmap; 586 queue->tx_irq = queue->rx_irq = err; 587 disable_irq(queue->tx_irq); 588 } else { 589 /* feature-split-event-channels == 1 */ 590 snprintf(queue->tx_irq_name, sizeof(queue->tx_irq_name), 591 "%s-tx", queue->name); 592 err = bind_interdomain_evtchn_to_irqhandler( 593 queue->vif->domid, tx_evtchn, xenvif_tx_interrupt, 0, 594 queue->tx_irq_name, queue); 595 if (err < 0) 596 goto err_unmap; 597 queue->tx_irq = err; 598 disable_irq(queue->tx_irq); 599 600 snprintf(queue->rx_irq_name, sizeof(queue->rx_irq_name), 601 "%s-rx", queue->name); 602 err = bind_interdomain_evtchn_to_irqhandler( 603 queue->vif->domid, rx_evtchn, xenvif_rx_interrupt, 0, 604 queue->rx_irq_name, queue); 605 if (err < 0) 606 goto err_tx_unbind; 607 queue->rx_irq = err; 608 disable_irq(queue->rx_irq); 609 } 610 611 task = kthread_create(xenvif_kthread_guest_rx, 612 (void *)queue, "%s-guest-rx", queue->name); 613 if (IS_ERR(task)) { 614 pr_warn("Could not allocate kthread for %s\n", queue->name); 615 err = PTR_ERR(task); 616 goto err_rx_unbind; 617 } 618 queue->task = task; 619 620 task = kthread_create(xenvif_dealloc_kthread, 621 (void *)queue, "%s-dealloc", queue->name); 622 if (IS_ERR(task)) { 623 pr_warn("Could not allocate kthread for %s\n", queue->name); 624 err = PTR_ERR(task); 625 goto err_rx_unbind; 626 } 627 queue->dealloc_task = task; 628 629 wake_up_process(queue->task); 630 wake_up_process(queue->dealloc_task); 631 632 netif_napi_add(queue->vif->dev, &queue->napi, xenvif_poll, 633 XENVIF_NAPI_WEIGHT); 634 635 return 0; 636 637 err_rx_unbind: 638 unbind_from_irqhandler(queue->rx_irq, queue); 639 queue->rx_irq = 0; 640 err_tx_unbind: 641 unbind_from_irqhandler(queue->tx_irq, queue); 642 queue->tx_irq = 0; 643 err_unmap: 644 xenvif_unmap_frontend_rings(queue); 645 err: 646 module_put(THIS_MODULE); 647 return err; 648 } 649 650 void xenvif_carrier_off(struct xenvif *vif) 651 { 652 struct net_device *dev = vif->dev; 653 654 rtnl_lock(); 655 if (test_and_clear_bit(VIF_STATUS_CONNECTED, &vif->status)) { 656 netif_carrier_off(dev); /* discard queued packets */ 657 if (netif_running(dev)) 658 xenvif_down(vif); 659 } 660 rtnl_unlock(); 661 } 662 663 void xenvif_disconnect(struct xenvif *vif) 664 { 665 struct xenvif_queue *queue = NULL; 666 unsigned int num_queues = vif->num_queues; 667 unsigned int queue_index; 668 669 xenvif_carrier_off(vif); 670 671 for (queue_index = 0; queue_index < num_queues; ++queue_index) { 672 queue = &vif->queues[queue_index]; 673 674 netif_napi_del(&queue->napi); 675 676 if (queue->task) { 677 del_timer_sync(&queue->rx_stalled); 678 kthread_stop(queue->task); 679 queue->task = NULL; 680 } 681 682 if (queue->dealloc_task) { 683 kthread_stop(queue->dealloc_task); 684 queue->dealloc_task = NULL; 685 } 686 687 if (queue->tx_irq) { 688 if (queue->tx_irq == queue->rx_irq) 689 unbind_from_irqhandler(queue->tx_irq, queue); 690 else { 691 unbind_from_irqhandler(queue->tx_irq, queue); 692 unbind_from_irqhandler(queue->rx_irq, queue); 693 } 694 queue->tx_irq = 0; 695 } 696 697 xenvif_unmap_frontend_rings(queue); 698 } 699 } 700 701 /* Reverse the relevant parts of xenvif_init_queue(). 702 * Used for queue teardown from xenvif_free(), and on the 703 * error handling paths in xenbus.c:connect(). 704 */ 705 void xenvif_deinit_queue(struct xenvif_queue *queue) 706 { 707 free_xenballooned_pages(MAX_PENDING_REQS, queue->mmap_pages); 708 } 709 710 void xenvif_free(struct xenvif *vif) 711 { 712 struct xenvif_queue *queue = NULL; 713 unsigned int num_queues = vif->num_queues; 714 unsigned int queue_index; 715 716 unregister_netdev(vif->dev); 717 718 for (queue_index = 0; queue_index < num_queues; ++queue_index) { 719 queue = &vif->queues[queue_index]; 720 xenvif_deinit_queue(queue); 721 } 722 723 vfree(vif->queues); 724 vif->queues = NULL; 725 vif->num_queues = 0; 726 727 free_netdev(vif->dev); 728 729 module_put(THIS_MODULE); 730 } 731