2 * Network-device interface management.
4 * Copyright (c) 2004-2005, Keir Fraser
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:
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:
19 * The above copyright notice and this permission notice shall be included in
20 * all copies or substantial portions of the Software.
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
33 #include <linux/kthread.h>
34 #include <linux/sched/task.h>
35 #include <linux/ethtool.h>
36 #include <linux/rtnetlink.h>
37 #include <linux/if_vlan.h>
38 #include <linux/vmalloc.h>
40 #include <xen/events.h>
41 #include <asm/xen/hypercall.h>
42 #include <xen/balloon.h>
44 #define XENVIF_QUEUE_LENGTH 32
45 #define XENVIF_NAPI_WEIGHT 64
47 /* Number of bytes allowed on the internal guest Rx queue. */
48 #define XENVIF_RX_QUEUE_BYTES (XEN_NETIF_RX_RING_SIZE/2 * PAGE_SIZE)
50 /* This function is used to set SKBTX_DEV_ZEROCOPY as well as
51 * increasing the inflight counter. We need to increase the inflight
52 * counter because core driver calls into xenvif_zerocopy_callback
53 * which calls xenvif_skb_zerocopy_complete.
55 void xenvif_skb_zerocopy_prepare(struct xenvif_queue *queue,
58 skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY;
59 atomic_inc(&queue->inflight_packets);
62 void xenvif_skb_zerocopy_complete(struct xenvif_queue *queue)
64 atomic_dec(&queue->inflight_packets);
66 /* Wake the dealloc thread _after_ decrementing inflight_packets so
67 * that if kthread_stop() has already been called, the dealloc thread
68 * does not wait forever with nothing to wake it.
70 wake_up(&queue->dealloc_wq);
73 int xenvif_schedulable(struct xenvif *vif)
75 return netif_running(vif->dev) &&
76 test_bit(VIF_STATUS_CONNECTED, &vif->status) &&
80 static bool xenvif_handle_tx_interrupt(struct xenvif_queue *queue)
84 rc = RING_HAS_UNCONSUMED_REQUESTS(&queue->tx);
86 napi_schedule(&queue->napi);
90 static irqreturn_t xenvif_tx_interrupt(int irq, void *dev_id)
92 struct xenvif_queue *queue = dev_id;
95 old = atomic_fetch_or(NETBK_TX_EOI, &queue->eoi_pending);
96 WARN(old & NETBK_TX_EOI, "Interrupt while EOI pending\n");
98 if (!xenvif_handle_tx_interrupt(queue)) {
99 atomic_andnot(NETBK_TX_EOI, &queue->eoi_pending);
100 xen_irq_lateeoi(irq, XEN_EOI_FLAG_SPURIOUS);
106 static int xenvif_poll(struct napi_struct *napi, int budget)
108 struct xenvif_queue *queue =
109 container_of(napi, struct xenvif_queue, napi);
112 /* This vif is rogue, we pretend we've there is nothing to do
113 * for this vif to deschedule it from NAPI. But this interface
114 * will be turned off in thread context later.
116 if (unlikely(queue->vif->disabled)) {
121 work_done = xenvif_tx_action(queue, budget);
123 if (work_done < budget) {
124 napi_complete_done(napi, work_done);
125 /* If the queue is rate-limited, it shall be
126 * rescheduled in the timer callback.
128 if (likely(!queue->rate_limited))
129 xenvif_napi_schedule_or_enable_events(queue);
135 static bool xenvif_handle_rx_interrupt(struct xenvif_queue *queue)
139 rc = xenvif_have_rx_work(queue, false);
141 xenvif_kick_thread(queue);
145 static irqreturn_t xenvif_rx_interrupt(int irq, void *dev_id)
147 struct xenvif_queue *queue = dev_id;
150 old = atomic_fetch_or(NETBK_RX_EOI, &queue->eoi_pending);
151 WARN(old & NETBK_RX_EOI, "Interrupt while EOI pending\n");
153 if (!xenvif_handle_rx_interrupt(queue)) {
154 atomic_andnot(NETBK_RX_EOI, &queue->eoi_pending);
155 xen_irq_lateeoi(irq, XEN_EOI_FLAG_SPURIOUS);
161 irqreturn_t xenvif_interrupt(int irq, void *dev_id)
163 struct xenvif_queue *queue = dev_id;
166 old = atomic_fetch_or(NETBK_COMMON_EOI, &queue->eoi_pending);
167 WARN(old, "Interrupt while EOI pending\n");
169 /* Use bitwise or as we need to call both functions. */
170 if ((!xenvif_handle_tx_interrupt(queue) |
171 !xenvif_handle_rx_interrupt(queue))) {
172 atomic_andnot(NETBK_COMMON_EOI, &queue->eoi_pending);
173 xen_irq_lateeoi(irq, XEN_EOI_FLAG_SPURIOUS);
179 int xenvif_queue_stopped(struct xenvif_queue *queue)
181 struct net_device *dev = queue->vif->dev;
182 unsigned int id = queue->id;
183 return netif_tx_queue_stopped(netdev_get_tx_queue(dev, id));
186 void xenvif_wake_queue(struct xenvif_queue *queue)
188 struct net_device *dev = queue->vif->dev;
189 unsigned int id = queue->id;
190 netif_tx_wake_queue(netdev_get_tx_queue(dev, id));
193 static u16 xenvif_select_queue(struct net_device *dev, struct sk_buff *skb,
194 struct net_device *sb_dev)
196 struct xenvif *vif = netdev_priv(dev);
197 unsigned int size = vif->hash.size;
198 unsigned int num_queues;
200 /* If queues are not set up internally - always return 0
201 * as the packet going to be dropped anyway */
202 num_queues = READ_ONCE(vif->num_queues);
206 if (vif->hash.alg == XEN_NETIF_CTRL_HASH_ALGORITHM_NONE)
207 return netdev_pick_tx(dev, skb, NULL) %
208 dev->real_num_tx_queues;
210 xenvif_set_skb_hash(vif, skb);
213 return skb_get_hash_raw(skb) % dev->real_num_tx_queues;
215 return vif->hash.mapping[vif->hash.mapping_sel]
216 [skb_get_hash_raw(skb) % size];
220 xenvif_start_xmit(struct sk_buff *skb, struct net_device *dev)
222 struct xenvif *vif = netdev_priv(dev);
223 struct xenvif_queue *queue = NULL;
224 unsigned int num_queues;
226 struct xenvif_rx_cb *cb;
228 BUG_ON(skb->dev != dev);
230 /* Drop the packet if queues are not set up.
231 * This handler should be called inside an RCU read section
232 * so we don't need to enter it here explicitly.
234 num_queues = READ_ONCE(vif->num_queues);
238 /* Obtain the queue to be used to transmit this packet */
239 index = skb_get_queue_mapping(skb);
240 if (index >= num_queues) {
241 pr_warn_ratelimited("Invalid queue %hu for packet on interface %s\n",
242 index, vif->dev->name);
245 queue = &vif->queues[index];
247 /* Drop the packet if queue is not ready */
248 if (queue->task == NULL ||
249 queue->dealloc_task == NULL ||
250 !xenvif_schedulable(vif))
253 if (vif->multicast_control && skb->pkt_type == PACKET_MULTICAST) {
254 struct ethhdr *eth = (struct ethhdr *)skb->data;
256 if (!xenvif_mcast_match(vif, eth->h_dest))
260 cb = XENVIF_RX_CB(skb);
261 cb->expires = jiffies + vif->drain_timeout;
263 /* If there is no hash algorithm configured then make sure there
264 * is no hash information in the socket buffer otherwise it
265 * would be incorrectly forwarded to the frontend.
267 if (vif->hash.alg == XEN_NETIF_CTRL_HASH_ALGORITHM_NONE)
270 xenvif_rx_queue_tail(queue, skb);
271 xenvif_kick_thread(queue);
276 vif->dev->stats.tx_dropped++;
281 static struct net_device_stats *xenvif_get_stats(struct net_device *dev)
283 struct xenvif *vif = netdev_priv(dev);
284 struct xenvif_queue *queue = NULL;
285 unsigned int num_queues;
293 num_queues = READ_ONCE(vif->num_queues);
295 /* Aggregate tx and rx stats from each queue */
296 for (index = 0; index < num_queues; ++index) {
297 queue = &vif->queues[index];
298 rx_bytes += queue->stats.rx_bytes;
299 rx_packets += queue->stats.rx_packets;
300 tx_bytes += queue->stats.tx_bytes;
301 tx_packets += queue->stats.tx_packets;
306 vif->dev->stats.rx_bytes = rx_bytes;
307 vif->dev->stats.rx_packets = rx_packets;
308 vif->dev->stats.tx_bytes = tx_bytes;
309 vif->dev->stats.tx_packets = tx_packets;
311 return &vif->dev->stats;
314 static void xenvif_up(struct xenvif *vif)
316 struct xenvif_queue *queue = NULL;
317 unsigned int num_queues = vif->num_queues;
318 unsigned int queue_index;
320 for (queue_index = 0; queue_index < num_queues; ++queue_index) {
321 queue = &vif->queues[queue_index];
322 napi_enable(&queue->napi);
323 enable_irq(queue->tx_irq);
324 if (queue->tx_irq != queue->rx_irq)
325 enable_irq(queue->rx_irq);
326 xenvif_napi_schedule_or_enable_events(queue);
330 static void xenvif_down(struct xenvif *vif)
332 struct xenvif_queue *queue = NULL;
333 unsigned int num_queues = vif->num_queues;
334 unsigned int queue_index;
336 for (queue_index = 0; queue_index < num_queues; ++queue_index) {
337 queue = &vif->queues[queue_index];
338 disable_irq(queue->tx_irq);
339 if (queue->tx_irq != queue->rx_irq)
340 disable_irq(queue->rx_irq);
341 napi_disable(&queue->napi);
342 del_timer_sync(&queue->credit_timeout);
346 static int xenvif_open(struct net_device *dev)
348 struct xenvif *vif = netdev_priv(dev);
349 if (test_bit(VIF_STATUS_CONNECTED, &vif->status))
351 netif_tx_start_all_queues(dev);
355 static int xenvif_close(struct net_device *dev)
357 struct xenvif *vif = netdev_priv(dev);
358 if (test_bit(VIF_STATUS_CONNECTED, &vif->status))
360 netif_tx_stop_all_queues(dev);
364 static int xenvif_change_mtu(struct net_device *dev, int mtu)
366 struct xenvif *vif = netdev_priv(dev);
367 int max = vif->can_sg ? ETH_MAX_MTU - VLAN_ETH_HLEN : ETH_DATA_LEN;
375 static netdev_features_t xenvif_fix_features(struct net_device *dev,
376 netdev_features_t features)
378 struct xenvif *vif = netdev_priv(dev);
381 features &= ~NETIF_F_SG;
382 if (~(vif->gso_mask) & GSO_BIT(TCPV4))
383 features &= ~NETIF_F_TSO;
384 if (~(vif->gso_mask) & GSO_BIT(TCPV6))
385 features &= ~NETIF_F_TSO6;
387 features &= ~NETIF_F_IP_CSUM;
389 features &= ~NETIF_F_IPV6_CSUM;
394 static const struct xenvif_stat {
395 char name[ETH_GSTRING_LEN];
399 "rx_gso_checksum_fixup",
400 offsetof(struct xenvif_stats, rx_gso_checksum_fixup)
402 /* If (sent != success + fail), there are probably packets never
407 offsetof(struct xenvif_stats, tx_zerocopy_sent),
410 "tx_zerocopy_success",
411 offsetof(struct xenvif_stats, tx_zerocopy_success),
415 offsetof(struct xenvif_stats, tx_zerocopy_fail)
417 /* Number of packets exceeding MAX_SKB_FRAG slots. You should use
418 * a guest with the same MAX_SKB_FRAG
422 offsetof(struct xenvif_stats, tx_frag_overflow)
426 static int xenvif_get_sset_count(struct net_device *dev, int string_set)
428 switch (string_set) {
430 return ARRAY_SIZE(xenvif_stats);
436 static void xenvif_get_ethtool_stats(struct net_device *dev,
437 struct ethtool_stats *stats, u64 * data)
439 struct xenvif *vif = netdev_priv(dev);
440 unsigned int num_queues;
442 unsigned int queue_index;
445 num_queues = READ_ONCE(vif->num_queues);
447 for (i = 0; i < ARRAY_SIZE(xenvif_stats); i++) {
448 unsigned long accum = 0;
449 for (queue_index = 0; queue_index < num_queues; ++queue_index) {
450 void *vif_stats = &vif->queues[queue_index].stats;
451 accum += *(unsigned long *)(vif_stats + xenvif_stats[i].offset);
459 static void xenvif_get_strings(struct net_device *dev, u32 stringset, u8 * data)
465 for (i = 0; i < ARRAY_SIZE(xenvif_stats); i++)
466 memcpy(data + i * ETH_GSTRING_LEN,
467 xenvif_stats[i].name, ETH_GSTRING_LEN);
472 static const struct ethtool_ops xenvif_ethtool_ops = {
473 .get_link = ethtool_op_get_link,
475 .get_sset_count = xenvif_get_sset_count,
476 .get_ethtool_stats = xenvif_get_ethtool_stats,
477 .get_strings = xenvif_get_strings,
480 static const struct net_device_ops xenvif_netdev_ops = {
481 .ndo_select_queue = xenvif_select_queue,
482 .ndo_start_xmit = xenvif_start_xmit,
483 .ndo_get_stats = xenvif_get_stats,
484 .ndo_open = xenvif_open,
485 .ndo_stop = xenvif_close,
486 .ndo_change_mtu = xenvif_change_mtu,
487 .ndo_fix_features = xenvif_fix_features,
488 .ndo_set_mac_address = eth_mac_addr,
489 .ndo_validate_addr = eth_validate_addr,
492 struct xenvif *xenvif_alloc(struct device *parent, domid_t domid,
496 struct net_device *dev;
498 char name[IFNAMSIZ] = {};
500 snprintf(name, IFNAMSIZ - 1, "vif%u.%u", domid, handle);
501 /* Allocate a netdev with the max. supported number of queues.
502 * When the guest selects the desired number, it will be updated
503 * via netif_set_real_num_*_queues().
505 dev = alloc_netdev_mq(sizeof(struct xenvif), name, NET_NAME_UNKNOWN,
506 ether_setup, xenvif_max_queues);
508 pr_warn("Could not allocate netdev for %s\n", name);
509 return ERR_PTR(-ENOMEM);
512 SET_NETDEV_DEV(dev, parent);
514 vif = netdev_priv(dev);
517 vif->handle = handle;
521 vif->disabled = false;
522 vif->drain_timeout = msecs_to_jiffies(rx_drain_timeout_msecs);
523 vif->stall_timeout = msecs_to_jiffies(rx_stall_timeout_msecs);
525 /* Start out with no queues. */
529 vif->xdp_headroom = 0;
531 spin_lock_init(&vif->lock);
532 INIT_LIST_HEAD(&vif->fe_mcast_addr);
534 dev->netdev_ops = &xenvif_netdev_ops;
535 dev->hw_features = NETIF_F_SG |
536 NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
537 NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_FRAGLIST;
538 dev->features = dev->hw_features | NETIF_F_RXCSUM;
539 dev->ethtool_ops = &xenvif_ethtool_ops;
541 dev->tx_queue_len = XENVIF_QUEUE_LENGTH;
543 dev->min_mtu = ETH_MIN_MTU;
544 dev->max_mtu = ETH_MAX_MTU - VLAN_ETH_HLEN;
547 * Initialise a dummy MAC address. We choose the numerically
548 * largest non-broadcast address to prevent the address getting
549 * stolen by an Ethernet bridge for STP purposes.
550 * (FE:FF:FF:FF:FF:FF)
552 eth_broadcast_addr(dev->dev_addr);
553 dev->dev_addr[0] &= ~0x01;
555 netif_carrier_off(dev);
557 err = register_netdev(dev);
559 netdev_warn(dev, "Could not register device: err=%d\n", err);
564 netdev_dbg(dev, "Successfully created xenvif\n");
566 __module_get(THIS_MODULE);
571 int xenvif_init_queue(struct xenvif_queue *queue)
575 queue->credit_bytes = queue->remaining_credit = ~0UL;
576 queue->credit_usec = 0UL;
577 timer_setup(&queue->credit_timeout, xenvif_tx_credit_callback, 0);
578 queue->credit_window_start = get_jiffies_64();
580 queue->rx_queue_max = XENVIF_RX_QUEUE_BYTES;
582 skb_queue_head_init(&queue->rx_queue);
583 skb_queue_head_init(&queue->tx_queue);
585 queue->pending_cons = 0;
586 queue->pending_prod = MAX_PENDING_REQS;
587 for (i = 0; i < MAX_PENDING_REQS; ++i)
588 queue->pending_ring[i] = i;
590 spin_lock_init(&queue->callback_lock);
591 spin_lock_init(&queue->response_lock);
593 /* If ballooning is disabled, this will consume real memory, so you
594 * better enable it. The long term solution would be to use just a
595 * bunch of valid page descriptors, without dependency on ballooning
597 err = gnttab_alloc_pages(MAX_PENDING_REQS,
600 netdev_err(queue->vif->dev, "Could not reserve mmap_pages\n");
604 for (i = 0; i < MAX_PENDING_REQS; i++) {
605 queue->pending_tx_info[i].callback_struct = (struct ubuf_info)
606 { .callback = xenvif_zerocopy_callback,
609 queue->grant_tx_handle[i] = NETBACK_INVALID_HANDLE;
615 void xenvif_carrier_on(struct xenvif *vif)
618 if (!vif->can_sg && vif->dev->mtu > ETH_DATA_LEN)
619 dev_set_mtu(vif->dev, ETH_DATA_LEN);
620 netdev_update_features(vif->dev);
621 set_bit(VIF_STATUS_CONNECTED, &vif->status);
622 if (netif_running(vif->dev))
627 int xenvif_connect_ctrl(struct xenvif *vif, grant_ref_t ring_ref,
630 struct net_device *dev = vif->dev;
632 struct xen_netif_ctrl_sring *shared;
633 RING_IDX rsp_prod, req_prod;
636 err = xenbus_map_ring_valloc(xenvif_to_xenbus_device(vif),
637 &ring_ref, 1, &addr);
641 shared = (struct xen_netif_ctrl_sring *)addr;
642 rsp_prod = READ_ONCE(shared->rsp_prod);
643 req_prod = READ_ONCE(shared->req_prod);
645 BACK_RING_ATTACH(&vif->ctrl, shared, rsp_prod, XEN_PAGE_SIZE);
648 if (req_prod - rsp_prod > RING_SIZE(&vif->ctrl))
651 err = bind_interdomain_evtchn_to_irq_lateeoi(vif->domid, evtchn);
657 xenvif_init_hash(vif);
659 err = request_threaded_irq(vif->ctrl_irq, NULL, xenvif_ctrl_irq_fn,
660 IRQF_ONESHOT, "xen-netback-ctrl", vif);
662 pr_warn("Could not setup irq handler for %s\n", dev->name);
669 xenvif_deinit_hash(vif);
670 unbind_from_irqhandler(vif->ctrl_irq, vif);
674 xenbus_unmap_ring_vfree(xenvif_to_xenbus_device(vif),
676 vif->ctrl.sring = NULL;
682 static void xenvif_disconnect_queue(struct xenvif_queue *queue)
685 kthread_stop(queue->task);
689 if (queue->dealloc_task) {
690 kthread_stop(queue->dealloc_task);
691 queue->dealloc_task = NULL;
694 if (queue->napi.poll) {
695 netif_napi_del(&queue->napi);
696 queue->napi.poll = NULL;
700 unbind_from_irqhandler(queue->tx_irq, queue);
701 if (queue->tx_irq == queue->rx_irq)
707 unbind_from_irqhandler(queue->rx_irq, queue);
711 xenvif_unmap_frontend_data_rings(queue);
714 int xenvif_connect_data(struct xenvif_queue *queue,
715 unsigned long tx_ring_ref,
716 unsigned long rx_ring_ref,
717 unsigned int tx_evtchn,
718 unsigned int rx_evtchn)
720 struct task_struct *task;
723 BUG_ON(queue->tx_irq);
725 BUG_ON(queue->dealloc_task);
727 err = xenvif_map_frontend_data_rings(queue, tx_ring_ref,
732 init_waitqueue_head(&queue->wq);
733 init_waitqueue_head(&queue->dealloc_wq);
734 atomic_set(&queue->inflight_packets, 0);
736 netif_napi_add(queue->vif->dev, &queue->napi, xenvif_poll,
739 queue->stalled = true;
741 task = kthread_run(xenvif_kthread_guest_rx, queue,
742 "%s-guest-rx", queue->name);
747 task = kthread_run(xenvif_dealloc_kthread, queue,
748 "%s-dealloc", queue->name);
751 queue->dealloc_task = task;
753 if (tx_evtchn == rx_evtchn) {
754 /* feature-split-event-channels == 0 */
755 err = bind_interdomain_evtchn_to_irqhandler_lateeoi(
756 queue->vif->domid, tx_evtchn, xenvif_interrupt, 0,
760 queue->tx_irq = queue->rx_irq = err;
761 disable_irq(queue->tx_irq);
763 /* feature-split-event-channels == 1 */
764 snprintf(queue->tx_irq_name, sizeof(queue->tx_irq_name),
765 "%s-tx", queue->name);
766 err = bind_interdomain_evtchn_to_irqhandler_lateeoi(
767 queue->vif->domid, tx_evtchn, xenvif_tx_interrupt, 0,
768 queue->tx_irq_name, queue);
772 disable_irq(queue->tx_irq);
774 snprintf(queue->rx_irq_name, sizeof(queue->rx_irq_name),
775 "%s-rx", queue->name);
776 err = bind_interdomain_evtchn_to_irqhandler_lateeoi(
777 queue->vif->domid, rx_evtchn, xenvif_rx_interrupt, 0,
778 queue->rx_irq_name, queue);
782 disable_irq(queue->rx_irq);
788 pr_warn("Could not allocate kthread for %s\n", queue->name);
791 xenvif_disconnect_queue(queue);
795 void xenvif_carrier_off(struct xenvif *vif)
797 struct net_device *dev = vif->dev;
800 if (test_and_clear_bit(VIF_STATUS_CONNECTED, &vif->status)) {
801 netif_carrier_off(dev); /* discard queued packets */
802 if (netif_running(dev))
808 void xenvif_disconnect_data(struct xenvif *vif)
810 struct xenvif_queue *queue = NULL;
811 unsigned int num_queues = vif->num_queues;
812 unsigned int queue_index;
814 xenvif_carrier_off(vif);
816 for (queue_index = 0; queue_index < num_queues; ++queue_index) {
817 queue = &vif->queues[queue_index];
819 xenvif_disconnect_queue(queue);
822 xenvif_mcast_addr_list_free(vif);
825 void xenvif_disconnect_ctrl(struct xenvif *vif)
828 xenvif_deinit_hash(vif);
829 unbind_from_irqhandler(vif->ctrl_irq, vif);
833 if (vif->ctrl.sring) {
834 xenbus_unmap_ring_vfree(xenvif_to_xenbus_device(vif),
836 vif->ctrl.sring = NULL;
840 /* Reverse the relevant parts of xenvif_init_queue().
841 * Used for queue teardown from xenvif_free(), and on the
842 * error handling paths in xenbus.c:connect().
844 void xenvif_deinit_queue(struct xenvif_queue *queue)
846 gnttab_free_pages(MAX_PENDING_REQS, queue->mmap_pages);
849 void xenvif_free(struct xenvif *vif)
851 struct xenvif_queue *queues = vif->queues;
852 unsigned int num_queues = vif->num_queues;
853 unsigned int queue_index;
855 unregister_netdev(vif->dev);
856 free_netdev(vif->dev);
858 for (queue_index = 0; queue_index < num_queues; ++queue_index)
859 xenvif_deinit_queue(&queues[queue_index]);
862 module_put(THIS_MODULE);