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 /* Wake the dealloc thread _after_ decrementing inflight_packets so 66 * that if kthread_stop() has already been called, the dealloc thread 67 * does not wait forever with nothing to wake it. 68 */ 69 wake_up(&queue->dealloc_wq); 70 } 71 72 int xenvif_schedulable(struct xenvif *vif) 73 { 74 return netif_running(vif->dev) && 75 test_bit(VIF_STATUS_CONNECTED, &vif->status) && 76 !vif->disabled; 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 static 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; 117 118 xenvif_kick_thread(queue); 119 120 return IRQ_HANDLED; 121 } 122 123 irqreturn_t xenvif_interrupt(int irq, void *dev_id) 124 { 125 xenvif_tx_interrupt(irq, dev_id); 126 xenvif_rx_interrupt(irq, dev_id); 127 128 return IRQ_HANDLED; 129 } 130 131 irqreturn_t xenvif_ctrl_interrupt(int irq, void *dev_id) 132 { 133 struct xenvif *vif = dev_id; 134 135 wake_up(&vif->ctrl_wq); 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 static u16 xenvif_select_queue(struct net_device *dev, struct sk_buff *skb, 155 void *accel_priv, 156 select_queue_fallback_t fallback) 157 { 158 struct xenvif *vif = netdev_priv(dev); 159 unsigned int size = vif->hash.size; 160 161 if (vif->hash.alg == XEN_NETIF_CTRL_HASH_ALGORITHM_NONE) { 162 u16 index = fallback(dev, skb) % dev->real_num_tx_queues; 163 164 /* Make sure there is no hash information in the socket 165 * buffer otherwise it would be incorrectly forwarded 166 * to the frontend. 167 */ 168 skb_clear_hash(skb); 169 170 return index; 171 } 172 173 xenvif_set_skb_hash(vif, skb); 174 175 if (size == 0) 176 return skb_get_hash_raw(skb) % dev->real_num_tx_queues; 177 178 return vif->hash.mapping[skb_get_hash_raw(skb) % size]; 179 } 180 181 static int xenvif_start_xmit(struct sk_buff *skb, struct net_device *dev) 182 { 183 struct xenvif *vif = netdev_priv(dev); 184 struct xenvif_queue *queue = NULL; 185 unsigned int num_queues = vif->num_queues; 186 u16 index; 187 struct xenvif_rx_cb *cb; 188 189 BUG_ON(skb->dev != dev); 190 191 /* Drop the packet if queues are not set up */ 192 if (num_queues < 1) 193 goto drop; 194 195 /* Obtain the queue to be used to transmit this packet */ 196 index = skb_get_queue_mapping(skb); 197 if (index >= num_queues) { 198 pr_warn_ratelimited("Invalid queue %hu for packet on interface %s\n.", 199 index, vif->dev->name); 200 index %= num_queues; 201 } 202 queue = &vif->queues[index]; 203 204 /* Drop the packet if queue is not ready */ 205 if (queue->task == NULL || 206 queue->dealloc_task == NULL || 207 !xenvif_schedulable(vif)) 208 goto drop; 209 210 if (vif->multicast_control && skb->pkt_type == PACKET_MULTICAST) { 211 struct ethhdr *eth = (struct ethhdr *)skb->data; 212 213 if (!xenvif_mcast_match(vif, eth->h_dest)) 214 goto drop; 215 } 216 217 cb = XENVIF_RX_CB(skb); 218 cb->expires = jiffies + vif->drain_timeout; 219 220 xenvif_rx_queue_tail(queue, skb); 221 xenvif_kick_thread(queue); 222 223 return NETDEV_TX_OK; 224 225 drop: 226 vif->dev->stats.tx_dropped++; 227 dev_kfree_skb(skb); 228 return NETDEV_TX_OK; 229 } 230 231 static struct net_device_stats *xenvif_get_stats(struct net_device *dev) 232 { 233 struct xenvif *vif = netdev_priv(dev); 234 struct xenvif_queue *queue = NULL; 235 unsigned int num_queues = vif->num_queues; 236 unsigned long rx_bytes = 0; 237 unsigned long rx_packets = 0; 238 unsigned long tx_bytes = 0; 239 unsigned long tx_packets = 0; 240 unsigned int index; 241 242 if (vif->queues == NULL) 243 goto out; 244 245 /* Aggregate tx and rx stats from each queue */ 246 for (index = 0; index < num_queues; ++index) { 247 queue = &vif->queues[index]; 248 rx_bytes += queue->stats.rx_bytes; 249 rx_packets += queue->stats.rx_packets; 250 tx_bytes += queue->stats.tx_bytes; 251 tx_packets += queue->stats.tx_packets; 252 } 253 254 out: 255 vif->dev->stats.rx_bytes = rx_bytes; 256 vif->dev->stats.rx_packets = rx_packets; 257 vif->dev->stats.tx_bytes = tx_bytes; 258 vif->dev->stats.tx_packets = tx_packets; 259 260 return &vif->dev->stats; 261 } 262 263 static void xenvif_up(struct xenvif *vif) 264 { 265 struct xenvif_queue *queue = NULL; 266 unsigned int num_queues = vif->num_queues; 267 unsigned int queue_index; 268 269 for (queue_index = 0; queue_index < num_queues; ++queue_index) { 270 queue = &vif->queues[queue_index]; 271 napi_enable(&queue->napi); 272 enable_irq(queue->tx_irq); 273 if (queue->tx_irq != queue->rx_irq) 274 enable_irq(queue->rx_irq); 275 xenvif_napi_schedule_or_enable_events(queue); 276 } 277 } 278 279 static void xenvif_down(struct xenvif *vif) 280 { 281 struct xenvif_queue *queue = NULL; 282 unsigned int num_queues = vif->num_queues; 283 unsigned int queue_index; 284 285 for (queue_index = 0; queue_index < num_queues; ++queue_index) { 286 queue = &vif->queues[queue_index]; 287 disable_irq(queue->tx_irq); 288 if (queue->tx_irq != queue->rx_irq) 289 disable_irq(queue->rx_irq); 290 napi_disable(&queue->napi); 291 del_timer_sync(&queue->credit_timeout); 292 } 293 } 294 295 static int xenvif_open(struct net_device *dev) 296 { 297 struct xenvif *vif = netdev_priv(dev); 298 if (test_bit(VIF_STATUS_CONNECTED, &vif->status)) 299 xenvif_up(vif); 300 netif_tx_start_all_queues(dev); 301 return 0; 302 } 303 304 static int xenvif_close(struct net_device *dev) 305 { 306 struct xenvif *vif = netdev_priv(dev); 307 if (test_bit(VIF_STATUS_CONNECTED, &vif->status)) 308 xenvif_down(vif); 309 netif_tx_stop_all_queues(dev); 310 return 0; 311 } 312 313 static int xenvif_change_mtu(struct net_device *dev, int mtu) 314 { 315 struct xenvif *vif = netdev_priv(dev); 316 int max = vif->can_sg ? 65535 - VLAN_ETH_HLEN : ETH_DATA_LEN; 317 318 if (mtu > max) 319 return -EINVAL; 320 dev->mtu = mtu; 321 return 0; 322 } 323 324 static netdev_features_t xenvif_fix_features(struct net_device *dev, 325 netdev_features_t features) 326 { 327 struct xenvif *vif = netdev_priv(dev); 328 329 if (!vif->can_sg) 330 features &= ~NETIF_F_SG; 331 if (~(vif->gso_mask | vif->gso_prefix_mask) & GSO_BIT(TCPV4)) 332 features &= ~NETIF_F_TSO; 333 if (~(vif->gso_mask | vif->gso_prefix_mask) & GSO_BIT(TCPV6)) 334 features &= ~NETIF_F_TSO6; 335 if (!vif->ip_csum) 336 features &= ~NETIF_F_IP_CSUM; 337 if (!vif->ipv6_csum) 338 features &= ~NETIF_F_IPV6_CSUM; 339 340 return features; 341 } 342 343 static const struct xenvif_stat { 344 char name[ETH_GSTRING_LEN]; 345 u16 offset; 346 } xenvif_stats[] = { 347 { 348 "rx_gso_checksum_fixup", 349 offsetof(struct xenvif_stats, rx_gso_checksum_fixup) 350 }, 351 /* If (sent != success + fail), there are probably packets never 352 * freed up properly! 353 */ 354 { 355 "tx_zerocopy_sent", 356 offsetof(struct xenvif_stats, tx_zerocopy_sent), 357 }, 358 { 359 "tx_zerocopy_success", 360 offsetof(struct xenvif_stats, tx_zerocopy_success), 361 }, 362 { 363 "tx_zerocopy_fail", 364 offsetof(struct xenvif_stats, tx_zerocopy_fail) 365 }, 366 /* Number of packets exceeding MAX_SKB_FRAG slots. You should use 367 * a guest with the same MAX_SKB_FRAG 368 */ 369 { 370 "tx_frag_overflow", 371 offsetof(struct xenvif_stats, tx_frag_overflow) 372 }, 373 }; 374 375 static int xenvif_get_sset_count(struct net_device *dev, int string_set) 376 { 377 switch (string_set) { 378 case ETH_SS_STATS: 379 return ARRAY_SIZE(xenvif_stats); 380 default: 381 return -EINVAL; 382 } 383 } 384 385 static void xenvif_get_ethtool_stats(struct net_device *dev, 386 struct ethtool_stats *stats, u64 * data) 387 { 388 struct xenvif *vif = netdev_priv(dev); 389 unsigned int num_queues = vif->num_queues; 390 int i; 391 unsigned int queue_index; 392 393 for (i = 0; i < ARRAY_SIZE(xenvif_stats); i++) { 394 unsigned long accum = 0; 395 for (queue_index = 0; queue_index < num_queues; ++queue_index) { 396 void *vif_stats = &vif->queues[queue_index].stats; 397 accum += *(unsigned long *)(vif_stats + xenvif_stats[i].offset); 398 } 399 data[i] = accum; 400 } 401 } 402 403 static void xenvif_get_strings(struct net_device *dev, u32 stringset, u8 * data) 404 { 405 int i; 406 407 switch (stringset) { 408 case ETH_SS_STATS: 409 for (i = 0; i < ARRAY_SIZE(xenvif_stats); i++) 410 memcpy(data + i * ETH_GSTRING_LEN, 411 xenvif_stats[i].name, ETH_GSTRING_LEN); 412 break; 413 } 414 } 415 416 static const struct ethtool_ops xenvif_ethtool_ops = { 417 .get_link = ethtool_op_get_link, 418 419 .get_sset_count = xenvif_get_sset_count, 420 .get_ethtool_stats = xenvif_get_ethtool_stats, 421 .get_strings = xenvif_get_strings, 422 }; 423 424 static const struct net_device_ops xenvif_netdev_ops = { 425 .ndo_select_queue = xenvif_select_queue, 426 .ndo_start_xmit = xenvif_start_xmit, 427 .ndo_get_stats = xenvif_get_stats, 428 .ndo_open = xenvif_open, 429 .ndo_stop = xenvif_close, 430 .ndo_change_mtu = xenvif_change_mtu, 431 .ndo_fix_features = xenvif_fix_features, 432 .ndo_set_mac_address = eth_mac_addr, 433 .ndo_validate_addr = eth_validate_addr, 434 }; 435 436 struct xenvif *xenvif_alloc(struct device *parent, domid_t domid, 437 unsigned int handle) 438 { 439 int err; 440 struct net_device *dev; 441 struct xenvif *vif; 442 char name[IFNAMSIZ] = {}; 443 444 snprintf(name, IFNAMSIZ - 1, "vif%u.%u", domid, handle); 445 /* Allocate a netdev with the max. supported number of queues. 446 * When the guest selects the desired number, it will be updated 447 * via netif_set_real_num_*_queues(). 448 */ 449 dev = alloc_netdev_mq(sizeof(struct xenvif), name, NET_NAME_UNKNOWN, 450 ether_setup, xenvif_max_queues); 451 if (dev == NULL) { 452 pr_warn("Could not allocate netdev for %s\n", name); 453 return ERR_PTR(-ENOMEM); 454 } 455 456 SET_NETDEV_DEV(dev, parent); 457 458 vif = netdev_priv(dev); 459 460 vif->domid = domid; 461 vif->handle = handle; 462 vif->can_sg = 1; 463 vif->ip_csum = 1; 464 vif->dev = dev; 465 vif->disabled = false; 466 vif->drain_timeout = msecs_to_jiffies(rx_drain_timeout_msecs); 467 vif->stall_timeout = msecs_to_jiffies(rx_stall_timeout_msecs); 468 469 /* Start out with no queues. */ 470 vif->queues = NULL; 471 vif->num_queues = 0; 472 473 spin_lock_init(&vif->lock); 474 INIT_LIST_HEAD(&vif->fe_mcast_addr); 475 476 dev->netdev_ops = &xenvif_netdev_ops; 477 dev->hw_features = NETIF_F_SG | 478 NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM | 479 NETIF_F_TSO | NETIF_F_TSO6; 480 dev->features = dev->hw_features | NETIF_F_RXCSUM; 481 dev->ethtool_ops = &xenvif_ethtool_ops; 482 483 dev->tx_queue_len = XENVIF_QUEUE_LENGTH; 484 485 /* 486 * Initialise a dummy MAC address. We choose the numerically 487 * largest non-broadcast address to prevent the address getting 488 * stolen by an Ethernet bridge for STP purposes. 489 * (FE:FF:FF:FF:FF:FF) 490 */ 491 eth_broadcast_addr(dev->dev_addr); 492 dev->dev_addr[0] &= ~0x01; 493 494 netif_carrier_off(dev); 495 496 err = register_netdev(dev); 497 if (err) { 498 netdev_warn(dev, "Could not register device: err=%d\n", err); 499 free_netdev(dev); 500 return ERR_PTR(err); 501 } 502 503 netdev_dbg(dev, "Successfully created xenvif\n"); 504 505 __module_get(THIS_MODULE); 506 507 return vif; 508 } 509 510 int xenvif_init_queue(struct xenvif_queue *queue) 511 { 512 int err, i; 513 514 queue->credit_bytes = queue->remaining_credit = ~0UL; 515 queue->credit_usec = 0UL; 516 init_timer(&queue->credit_timeout); 517 queue->credit_timeout.function = xenvif_tx_credit_callback; 518 queue->credit_window_start = get_jiffies_64(); 519 520 queue->rx_queue_max = XENVIF_RX_QUEUE_BYTES; 521 522 skb_queue_head_init(&queue->rx_queue); 523 skb_queue_head_init(&queue->tx_queue); 524 525 queue->pending_cons = 0; 526 queue->pending_prod = MAX_PENDING_REQS; 527 for (i = 0; i < MAX_PENDING_REQS; ++i) 528 queue->pending_ring[i] = i; 529 530 spin_lock_init(&queue->callback_lock); 531 spin_lock_init(&queue->response_lock); 532 533 /* If ballooning is disabled, this will consume real memory, so you 534 * better enable it. The long term solution would be to use just a 535 * bunch of valid page descriptors, without dependency on ballooning 536 */ 537 err = gnttab_alloc_pages(MAX_PENDING_REQS, 538 queue->mmap_pages); 539 if (err) { 540 netdev_err(queue->vif->dev, "Could not reserve mmap_pages\n"); 541 return -ENOMEM; 542 } 543 544 for (i = 0; i < MAX_PENDING_REQS; i++) { 545 queue->pending_tx_info[i].callback_struct = (struct ubuf_info) 546 { .callback = xenvif_zerocopy_callback, 547 .ctx = NULL, 548 .desc = i }; 549 queue->grant_tx_handle[i] = NETBACK_INVALID_HANDLE; 550 } 551 552 return 0; 553 } 554 555 void xenvif_carrier_on(struct xenvif *vif) 556 { 557 rtnl_lock(); 558 if (!vif->can_sg && vif->dev->mtu > ETH_DATA_LEN) 559 dev_set_mtu(vif->dev, ETH_DATA_LEN); 560 netdev_update_features(vif->dev); 561 set_bit(VIF_STATUS_CONNECTED, &vif->status); 562 if (netif_running(vif->dev)) 563 xenvif_up(vif); 564 rtnl_unlock(); 565 } 566 567 int xenvif_connect_ctrl(struct xenvif *vif, grant_ref_t ring_ref, 568 unsigned int evtchn) 569 { 570 struct net_device *dev = vif->dev; 571 void *addr; 572 struct xen_netif_ctrl_sring *shared; 573 struct task_struct *task; 574 int err = -ENOMEM; 575 576 err = xenbus_map_ring_valloc(xenvif_to_xenbus_device(vif), 577 &ring_ref, 1, &addr); 578 if (err) 579 goto err; 580 581 shared = (struct xen_netif_ctrl_sring *)addr; 582 BACK_RING_INIT(&vif->ctrl, shared, XEN_PAGE_SIZE); 583 584 init_waitqueue_head(&vif->ctrl_wq); 585 586 err = bind_interdomain_evtchn_to_irqhandler(vif->domid, evtchn, 587 xenvif_ctrl_interrupt, 588 0, dev->name, vif); 589 if (err < 0) 590 goto err_unmap; 591 592 vif->ctrl_irq = err; 593 594 xenvif_init_hash(vif); 595 596 task = kthread_create(xenvif_ctrl_kthread, (void *)vif, 597 "%s-control", dev->name); 598 if (IS_ERR(task)) { 599 pr_warn("Could not allocate kthread for %s\n", dev->name); 600 err = PTR_ERR(task); 601 goto err_deinit; 602 } 603 604 get_task_struct(task); 605 vif->ctrl_task = task; 606 607 wake_up_process(vif->ctrl_task); 608 609 return 0; 610 611 err_deinit: 612 xenvif_deinit_hash(vif); 613 unbind_from_irqhandler(vif->ctrl_irq, vif); 614 vif->ctrl_irq = 0; 615 616 err_unmap: 617 xenbus_unmap_ring_vfree(xenvif_to_xenbus_device(vif), 618 vif->ctrl.sring); 619 vif->ctrl.sring = NULL; 620 621 err: 622 return err; 623 } 624 625 int xenvif_connect_data(struct xenvif_queue *queue, 626 unsigned long tx_ring_ref, 627 unsigned long rx_ring_ref, 628 unsigned int tx_evtchn, 629 unsigned int rx_evtchn) 630 { 631 struct task_struct *task; 632 int err = -ENOMEM; 633 634 BUG_ON(queue->tx_irq); 635 BUG_ON(queue->task); 636 BUG_ON(queue->dealloc_task); 637 638 err = xenvif_map_frontend_data_rings(queue, tx_ring_ref, 639 rx_ring_ref); 640 if (err < 0) 641 goto err; 642 643 init_waitqueue_head(&queue->wq); 644 init_waitqueue_head(&queue->dealloc_wq); 645 atomic_set(&queue->inflight_packets, 0); 646 647 netif_napi_add(queue->vif->dev, &queue->napi, xenvif_poll, 648 XENVIF_NAPI_WEIGHT); 649 650 if (tx_evtchn == rx_evtchn) { 651 /* feature-split-event-channels == 0 */ 652 err = bind_interdomain_evtchn_to_irqhandler( 653 queue->vif->domid, tx_evtchn, xenvif_interrupt, 0, 654 queue->name, queue); 655 if (err < 0) 656 goto err_unmap; 657 queue->tx_irq = queue->rx_irq = err; 658 disable_irq(queue->tx_irq); 659 } else { 660 /* feature-split-event-channels == 1 */ 661 snprintf(queue->tx_irq_name, sizeof(queue->tx_irq_name), 662 "%s-tx", queue->name); 663 err = bind_interdomain_evtchn_to_irqhandler( 664 queue->vif->domid, tx_evtchn, xenvif_tx_interrupt, 0, 665 queue->tx_irq_name, queue); 666 if (err < 0) 667 goto err_unmap; 668 queue->tx_irq = err; 669 disable_irq(queue->tx_irq); 670 671 snprintf(queue->rx_irq_name, sizeof(queue->rx_irq_name), 672 "%s-rx", queue->name); 673 err = bind_interdomain_evtchn_to_irqhandler( 674 queue->vif->domid, rx_evtchn, xenvif_rx_interrupt, 0, 675 queue->rx_irq_name, queue); 676 if (err < 0) 677 goto err_tx_unbind; 678 queue->rx_irq = err; 679 disable_irq(queue->rx_irq); 680 } 681 682 queue->stalled = true; 683 684 task = kthread_create(xenvif_kthread_guest_rx, 685 (void *)queue, "%s-guest-rx", queue->name); 686 if (IS_ERR(task)) { 687 pr_warn("Could not allocate kthread for %s\n", queue->name); 688 err = PTR_ERR(task); 689 goto err_rx_unbind; 690 } 691 queue->task = task; 692 get_task_struct(task); 693 694 task = kthread_create(xenvif_dealloc_kthread, 695 (void *)queue, "%s-dealloc", queue->name); 696 if (IS_ERR(task)) { 697 pr_warn("Could not allocate kthread for %s\n", queue->name); 698 err = PTR_ERR(task); 699 goto err_rx_unbind; 700 } 701 queue->dealloc_task = task; 702 703 wake_up_process(queue->task); 704 wake_up_process(queue->dealloc_task); 705 706 return 0; 707 708 err_rx_unbind: 709 unbind_from_irqhandler(queue->rx_irq, queue); 710 queue->rx_irq = 0; 711 err_tx_unbind: 712 unbind_from_irqhandler(queue->tx_irq, queue); 713 queue->tx_irq = 0; 714 err_unmap: 715 xenvif_unmap_frontend_data_rings(queue); 716 netif_napi_del(&queue->napi); 717 err: 718 module_put(THIS_MODULE); 719 return err; 720 } 721 722 void xenvif_carrier_off(struct xenvif *vif) 723 { 724 struct net_device *dev = vif->dev; 725 726 rtnl_lock(); 727 if (test_and_clear_bit(VIF_STATUS_CONNECTED, &vif->status)) { 728 netif_carrier_off(dev); /* discard queued packets */ 729 if (netif_running(dev)) 730 xenvif_down(vif); 731 } 732 rtnl_unlock(); 733 } 734 735 void xenvif_disconnect_data(struct xenvif *vif) 736 { 737 struct xenvif_queue *queue = NULL; 738 unsigned int num_queues = vif->num_queues; 739 unsigned int queue_index; 740 741 xenvif_carrier_off(vif); 742 743 for (queue_index = 0; queue_index < num_queues; ++queue_index) { 744 queue = &vif->queues[queue_index]; 745 746 netif_napi_del(&queue->napi); 747 748 if (queue->task) { 749 kthread_stop(queue->task); 750 put_task_struct(queue->task); 751 queue->task = NULL; 752 } 753 754 if (queue->dealloc_task) { 755 kthread_stop(queue->dealloc_task); 756 queue->dealloc_task = NULL; 757 } 758 759 if (queue->tx_irq) { 760 if (queue->tx_irq == queue->rx_irq) 761 unbind_from_irqhandler(queue->tx_irq, queue); 762 else { 763 unbind_from_irqhandler(queue->tx_irq, queue); 764 unbind_from_irqhandler(queue->rx_irq, queue); 765 } 766 queue->tx_irq = 0; 767 } 768 769 xenvif_unmap_frontend_data_rings(queue); 770 } 771 772 xenvif_mcast_addr_list_free(vif); 773 } 774 775 void xenvif_disconnect_ctrl(struct xenvif *vif) 776 { 777 if (vif->ctrl_task) { 778 kthread_stop(vif->ctrl_task); 779 put_task_struct(vif->ctrl_task); 780 vif->ctrl_task = NULL; 781 } 782 783 if (vif->ctrl_irq) { 784 xenvif_deinit_hash(vif); 785 unbind_from_irqhandler(vif->ctrl_irq, vif); 786 vif->ctrl_irq = 0; 787 } 788 789 if (vif->ctrl.sring) { 790 xenbus_unmap_ring_vfree(xenvif_to_xenbus_device(vif), 791 vif->ctrl.sring); 792 vif->ctrl.sring = NULL; 793 } 794 } 795 796 /* Reverse the relevant parts of xenvif_init_queue(). 797 * Used for queue teardown from xenvif_free(), and on the 798 * error handling paths in xenbus.c:connect(). 799 */ 800 void xenvif_deinit_queue(struct xenvif_queue *queue) 801 { 802 gnttab_free_pages(MAX_PENDING_REQS, queue->mmap_pages); 803 } 804 805 void xenvif_free(struct xenvif *vif) 806 { 807 struct xenvif_queue *queues = vif->queues; 808 unsigned int num_queues = vif->num_queues; 809 unsigned int queue_index; 810 811 unregister_netdev(vif->dev); 812 free_netdev(vif->dev); 813 814 for (queue_index = 0; queue_index < num_queues; ++queue_index) 815 xenvif_deinit_queue(&queues[queue_index]); 816 vfree(queues); 817 818 module_put(THIS_MODULE); 819 } 820