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/ethtool.h>
35 #include <linux/rtnetlink.h>
36 #include <linux/if_vlan.h>
37 #include <linux/vmalloc.h>
39 #include <xen/events.h>
40 #include <asm/xen/hypercall.h>
41 #include <xen/balloon.h>
43 #define XENVIF_QUEUE_LENGTH 32
44 #define XENVIF_NAPI_WEIGHT 64
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)
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.
54 void xenvif_skb_zerocopy_prepare(struct xenvif_queue
*queue
,
57 skb_shinfo(skb
)->tx_flags
|= SKBTX_DEV_ZEROCOPY
;
58 atomic_inc(&queue
->inflight_packets
);
61 void xenvif_skb_zerocopy_complete(struct xenvif_queue
*queue
)
63 atomic_dec(&queue
->inflight_packets
);
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.
69 wake_up(&queue
->dealloc_wq
);
72 int xenvif_schedulable(struct xenvif
*vif
)
74 return netif_running(vif
->dev
) &&
75 test_bit(VIF_STATUS_CONNECTED
, &vif
->status
) &&
79 static irqreturn_t
xenvif_tx_interrupt(int irq
, void *dev_id
)
81 struct xenvif_queue
*queue
= dev_id
;
83 if (RING_HAS_UNCONSUMED_REQUESTS(&queue
->tx
))
84 napi_schedule(&queue
->napi
);
89 static int xenvif_poll(struct napi_struct
*napi
, int budget
)
91 struct xenvif_queue
*queue
=
92 container_of(napi
, struct xenvif_queue
, napi
);
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.
99 if (unlikely(queue
->vif
->disabled
)) {
104 work_done
= xenvif_tx_action(queue
, budget
);
106 if (work_done
< budget
) {
108 xenvif_napi_schedule_or_enable_events(queue
);
114 static irqreturn_t
xenvif_rx_interrupt(int irq
, void *dev_id
)
116 struct xenvif_queue
*queue
= dev_id
;
118 xenvif_kick_thread(queue
);
123 irqreturn_t
xenvif_interrupt(int irq
, void *dev_id
)
125 xenvif_tx_interrupt(irq
, dev_id
);
126 xenvif_rx_interrupt(irq
, dev_id
);
131 int xenvif_queue_stopped(struct xenvif_queue
*queue
)
133 struct net_device
*dev
= queue
->vif
->dev
;
134 unsigned int id
= queue
->id
;
135 return netif_tx_queue_stopped(netdev_get_tx_queue(dev
, id
));
138 void xenvif_wake_queue(struct xenvif_queue
*queue
)
140 struct net_device
*dev
= queue
->vif
->dev
;
141 unsigned int id
= queue
->id
;
142 netif_tx_wake_queue(netdev_get_tx_queue(dev
, id
));
145 static u16
xenvif_select_queue(struct net_device
*dev
, struct sk_buff
*skb
,
147 select_queue_fallback_t fallback
)
149 struct xenvif
*vif
= netdev_priv(dev
);
150 unsigned int size
= vif
->hash
.size
;
152 if (vif
->hash
.alg
== XEN_NETIF_CTRL_HASH_ALGORITHM_NONE
)
153 return fallback(dev
, skb
) % dev
->real_num_tx_queues
;
155 xenvif_set_skb_hash(vif
, skb
);
158 return skb_get_hash_raw(skb
) % dev
->real_num_tx_queues
;
160 return vif
->hash
.mapping
[skb_get_hash_raw(skb
) % size
];
163 static int xenvif_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
165 struct xenvif
*vif
= netdev_priv(dev
);
166 struct xenvif_queue
*queue
= NULL
;
167 unsigned int num_queues
= vif
->num_queues
;
169 struct xenvif_rx_cb
*cb
;
171 BUG_ON(skb
->dev
!= dev
);
173 /* Drop the packet if queues are not set up */
177 /* Obtain the queue to be used to transmit this packet */
178 index
= skb_get_queue_mapping(skb
);
179 if (index
>= num_queues
) {
180 pr_warn_ratelimited("Invalid queue %hu for packet on interface %s\n.",
181 index
, vif
->dev
->name
);
184 queue
= &vif
->queues
[index
];
186 /* Drop the packet if queue is not ready */
187 if (queue
->task
== NULL
||
188 queue
->dealloc_task
== NULL
||
189 !xenvif_schedulable(vif
))
192 if (vif
->multicast_control
&& skb
->pkt_type
== PACKET_MULTICAST
) {
193 struct ethhdr
*eth
= (struct ethhdr
*)skb
->data
;
195 if (!xenvif_mcast_match(vif
, eth
->h_dest
))
199 cb
= XENVIF_RX_CB(skb
);
200 cb
->expires
= jiffies
+ vif
->drain_timeout
;
202 /* If there is no hash algorithm configured then make sure there
203 * is no hash information in the socket buffer otherwise it
204 * would be incorrectly forwarded to the frontend.
206 if (vif
->hash
.alg
== XEN_NETIF_CTRL_HASH_ALGORITHM_NONE
)
209 xenvif_rx_queue_tail(queue
, skb
);
210 xenvif_kick_thread(queue
);
215 vif
->dev
->stats
.tx_dropped
++;
220 static struct net_device_stats
*xenvif_get_stats(struct net_device
*dev
)
222 struct xenvif
*vif
= netdev_priv(dev
);
223 struct xenvif_queue
*queue
= NULL
;
224 unsigned long rx_bytes
= 0;
225 unsigned long rx_packets
= 0;
226 unsigned long tx_bytes
= 0;
227 unsigned long tx_packets
= 0;
230 spin_lock(&vif
->lock
);
231 if (vif
->queues
== NULL
)
234 /* Aggregate tx and rx stats from each queue */
235 for (index
= 0; index
< vif
->num_queues
; ++index
) {
236 queue
= &vif
->queues
[index
];
237 rx_bytes
+= queue
->stats
.rx_bytes
;
238 rx_packets
+= queue
->stats
.rx_packets
;
239 tx_bytes
+= queue
->stats
.tx_bytes
;
240 tx_packets
+= queue
->stats
.tx_packets
;
244 spin_unlock(&vif
->lock
);
246 vif
->dev
->stats
.rx_bytes
= rx_bytes
;
247 vif
->dev
->stats
.rx_packets
= rx_packets
;
248 vif
->dev
->stats
.tx_bytes
= tx_bytes
;
249 vif
->dev
->stats
.tx_packets
= tx_packets
;
251 return &vif
->dev
->stats
;
254 static void xenvif_up(struct xenvif
*vif
)
256 struct xenvif_queue
*queue
= NULL
;
257 unsigned int num_queues
= vif
->num_queues
;
258 unsigned int queue_index
;
260 for (queue_index
= 0; queue_index
< num_queues
; ++queue_index
) {
261 queue
= &vif
->queues
[queue_index
];
262 napi_enable(&queue
->napi
);
263 enable_irq(queue
->tx_irq
);
264 if (queue
->tx_irq
!= queue
->rx_irq
)
265 enable_irq(queue
->rx_irq
);
266 xenvif_napi_schedule_or_enable_events(queue
);
270 static void xenvif_down(struct xenvif
*vif
)
272 struct xenvif_queue
*queue
= NULL
;
273 unsigned int num_queues
= vif
->num_queues
;
274 unsigned int queue_index
;
276 for (queue_index
= 0; queue_index
< num_queues
; ++queue_index
) {
277 queue
= &vif
->queues
[queue_index
];
278 disable_irq(queue
->tx_irq
);
279 if (queue
->tx_irq
!= queue
->rx_irq
)
280 disable_irq(queue
->rx_irq
);
281 napi_disable(&queue
->napi
);
282 del_timer_sync(&queue
->credit_timeout
);
286 static int xenvif_open(struct net_device
*dev
)
288 struct xenvif
*vif
= netdev_priv(dev
);
289 if (test_bit(VIF_STATUS_CONNECTED
, &vif
->status
))
291 netif_tx_start_all_queues(dev
);
295 static int xenvif_close(struct net_device
*dev
)
297 struct xenvif
*vif
= netdev_priv(dev
);
298 if (test_bit(VIF_STATUS_CONNECTED
, &vif
->status
))
300 netif_tx_stop_all_queues(dev
);
304 static int xenvif_change_mtu(struct net_device
*dev
, int mtu
)
306 struct xenvif
*vif
= netdev_priv(dev
);
307 int max
= vif
->can_sg
? ETH_MAX_MTU
- VLAN_ETH_HLEN
: ETH_DATA_LEN
;
315 static netdev_features_t
xenvif_fix_features(struct net_device
*dev
,
316 netdev_features_t features
)
318 struct xenvif
*vif
= netdev_priv(dev
);
321 features
&= ~NETIF_F_SG
;
322 if (~(vif
->gso_mask
) & GSO_BIT(TCPV4
))
323 features
&= ~NETIF_F_TSO
;
324 if (~(vif
->gso_mask
) & GSO_BIT(TCPV6
))
325 features
&= ~NETIF_F_TSO6
;
327 features
&= ~NETIF_F_IP_CSUM
;
329 features
&= ~NETIF_F_IPV6_CSUM
;
334 static const struct xenvif_stat
{
335 char name
[ETH_GSTRING_LEN
];
339 "rx_gso_checksum_fixup",
340 offsetof(struct xenvif_stats
, rx_gso_checksum_fixup
)
342 /* If (sent != success + fail), there are probably packets never
347 offsetof(struct xenvif_stats
, tx_zerocopy_sent
),
350 "tx_zerocopy_success",
351 offsetof(struct xenvif_stats
, tx_zerocopy_success
),
355 offsetof(struct xenvif_stats
, tx_zerocopy_fail
)
357 /* Number of packets exceeding MAX_SKB_FRAG slots. You should use
358 * a guest with the same MAX_SKB_FRAG
362 offsetof(struct xenvif_stats
, tx_frag_overflow
)
366 static int xenvif_get_sset_count(struct net_device
*dev
, int string_set
)
368 switch (string_set
) {
370 return ARRAY_SIZE(xenvif_stats
);
376 static void xenvif_get_ethtool_stats(struct net_device
*dev
,
377 struct ethtool_stats
*stats
, u64
* data
)
379 struct xenvif
*vif
= netdev_priv(dev
);
380 unsigned int num_queues
= vif
->num_queues
;
382 unsigned int queue_index
;
384 for (i
= 0; i
< ARRAY_SIZE(xenvif_stats
); i
++) {
385 unsigned long accum
= 0;
386 for (queue_index
= 0; queue_index
< num_queues
; ++queue_index
) {
387 void *vif_stats
= &vif
->queues
[queue_index
].stats
;
388 accum
+= *(unsigned long *)(vif_stats
+ xenvif_stats
[i
].offset
);
394 static void xenvif_get_strings(struct net_device
*dev
, u32 stringset
, u8
* data
)
400 for (i
= 0; i
< ARRAY_SIZE(xenvif_stats
); i
++)
401 memcpy(data
+ i
* ETH_GSTRING_LEN
,
402 xenvif_stats
[i
].name
, ETH_GSTRING_LEN
);
407 static const struct ethtool_ops xenvif_ethtool_ops
= {
408 .get_link
= ethtool_op_get_link
,
410 .get_sset_count
= xenvif_get_sset_count
,
411 .get_ethtool_stats
= xenvif_get_ethtool_stats
,
412 .get_strings
= xenvif_get_strings
,
415 static const struct net_device_ops xenvif_netdev_ops
= {
416 .ndo_select_queue
= xenvif_select_queue
,
417 .ndo_start_xmit
= xenvif_start_xmit
,
418 .ndo_get_stats
= xenvif_get_stats
,
419 .ndo_open
= xenvif_open
,
420 .ndo_stop
= xenvif_close
,
421 .ndo_change_mtu
= xenvif_change_mtu
,
422 .ndo_fix_features
= xenvif_fix_features
,
423 .ndo_set_mac_address
= eth_mac_addr
,
424 .ndo_validate_addr
= eth_validate_addr
,
427 struct xenvif
*xenvif_alloc(struct device
*parent
, domid_t domid
,
431 struct net_device
*dev
;
433 char name
[IFNAMSIZ
] = {};
435 snprintf(name
, IFNAMSIZ
- 1, "vif%u.%u", domid
, handle
);
436 /* Allocate a netdev with the max. supported number of queues.
437 * When the guest selects the desired number, it will be updated
438 * via netif_set_real_num_*_queues().
440 dev
= alloc_netdev_mq(sizeof(struct xenvif
), name
, NET_NAME_UNKNOWN
,
441 ether_setup
, xenvif_max_queues
);
443 pr_warn("Could not allocate netdev for %s\n", name
);
444 return ERR_PTR(-ENOMEM
);
447 SET_NETDEV_DEV(dev
, parent
);
449 vif
= netdev_priv(dev
);
452 vif
->handle
= handle
;
456 vif
->disabled
= false;
457 vif
->drain_timeout
= msecs_to_jiffies(rx_drain_timeout_msecs
);
458 vif
->stall_timeout
= msecs_to_jiffies(rx_stall_timeout_msecs
);
460 /* Start out with no queues. */
464 spin_lock_init(&vif
->lock
);
465 INIT_LIST_HEAD(&vif
->fe_mcast_addr
);
467 dev
->netdev_ops
= &xenvif_netdev_ops
;
468 dev
->hw_features
= NETIF_F_SG
|
469 NETIF_F_IP_CSUM
| NETIF_F_IPV6_CSUM
|
470 NETIF_F_TSO
| NETIF_F_TSO6
| NETIF_F_FRAGLIST
;
471 dev
->features
= dev
->hw_features
| NETIF_F_RXCSUM
;
472 dev
->ethtool_ops
= &xenvif_ethtool_ops
;
474 dev
->tx_queue_len
= XENVIF_QUEUE_LENGTH
;
477 dev
->max_mtu
= ETH_MAX_MTU
- VLAN_ETH_HLEN
;
480 * Initialise a dummy MAC address. We choose the numerically
481 * largest non-broadcast address to prevent the address getting
482 * stolen by an Ethernet bridge for STP purposes.
483 * (FE:FF:FF:FF:FF:FF)
485 eth_broadcast_addr(dev
->dev_addr
);
486 dev
->dev_addr
[0] &= ~0x01;
488 netif_carrier_off(dev
);
490 err
= register_netdev(dev
);
492 netdev_warn(dev
, "Could not register device: err=%d\n", err
);
497 netdev_dbg(dev
, "Successfully created xenvif\n");
499 __module_get(THIS_MODULE
);
504 int xenvif_init_queue(struct xenvif_queue
*queue
)
508 queue
->credit_bytes
= queue
->remaining_credit
= ~0UL;
509 queue
->credit_usec
= 0UL;
510 init_timer(&queue
->credit_timeout
);
511 queue
->credit_timeout
.function
= xenvif_tx_credit_callback
;
512 queue
->credit_window_start
= get_jiffies_64();
514 queue
->rx_queue_max
= XENVIF_RX_QUEUE_BYTES
;
516 skb_queue_head_init(&queue
->rx_queue
);
517 skb_queue_head_init(&queue
->tx_queue
);
519 queue
->pending_cons
= 0;
520 queue
->pending_prod
= MAX_PENDING_REQS
;
521 for (i
= 0; i
< MAX_PENDING_REQS
; ++i
)
522 queue
->pending_ring
[i
] = i
;
524 spin_lock_init(&queue
->callback_lock
);
525 spin_lock_init(&queue
->response_lock
);
527 /* If ballooning is disabled, this will consume real memory, so you
528 * better enable it. The long term solution would be to use just a
529 * bunch of valid page descriptors, without dependency on ballooning
531 err
= gnttab_alloc_pages(MAX_PENDING_REQS
,
534 netdev_err(queue
->vif
->dev
, "Could not reserve mmap_pages\n");
538 for (i
= 0; i
< MAX_PENDING_REQS
; i
++) {
539 queue
->pending_tx_info
[i
].callback_struct
= (struct ubuf_info
)
540 { .callback
= xenvif_zerocopy_callback
,
543 queue
->grant_tx_handle
[i
] = NETBACK_INVALID_HANDLE
;
549 void xenvif_carrier_on(struct xenvif
*vif
)
552 if (!vif
->can_sg
&& vif
->dev
->mtu
> ETH_DATA_LEN
)
553 dev_set_mtu(vif
->dev
, ETH_DATA_LEN
);
554 netdev_update_features(vif
->dev
);
555 set_bit(VIF_STATUS_CONNECTED
, &vif
->status
);
556 if (netif_running(vif
->dev
))
561 int xenvif_connect_ctrl(struct xenvif
*vif
, grant_ref_t ring_ref
,
564 struct net_device
*dev
= vif
->dev
;
566 struct xen_netif_ctrl_sring
*shared
;
569 err
= xenbus_map_ring_valloc(xenvif_to_xenbus_device(vif
),
570 &ring_ref
, 1, &addr
);
574 shared
= (struct xen_netif_ctrl_sring
*)addr
;
575 BACK_RING_INIT(&vif
->ctrl
, shared
, XEN_PAGE_SIZE
);
577 err
= bind_interdomain_evtchn_to_irq(vif
->domid
, evtchn
);
583 xenvif_init_hash(vif
);
585 err
= request_threaded_irq(vif
->ctrl_irq
, NULL
, xenvif_ctrl_irq_fn
,
586 IRQF_ONESHOT
, "xen-netback-ctrl", vif
);
588 pr_warn("Could not setup irq handler for %s\n", dev
->name
);
595 xenvif_deinit_hash(vif
);
596 unbind_from_irqhandler(vif
->ctrl_irq
, vif
);
600 xenbus_unmap_ring_vfree(xenvif_to_xenbus_device(vif
),
602 vif
->ctrl
.sring
= NULL
;
608 int xenvif_connect_data(struct xenvif_queue
*queue
,
609 unsigned long tx_ring_ref
,
610 unsigned long rx_ring_ref
,
611 unsigned int tx_evtchn
,
612 unsigned int rx_evtchn
)
614 struct task_struct
*task
;
617 BUG_ON(queue
->tx_irq
);
619 BUG_ON(queue
->dealloc_task
);
621 err
= xenvif_map_frontend_data_rings(queue
, tx_ring_ref
,
626 init_waitqueue_head(&queue
->wq
);
627 init_waitqueue_head(&queue
->dealloc_wq
);
628 atomic_set(&queue
->inflight_packets
, 0);
630 netif_napi_add(queue
->vif
->dev
, &queue
->napi
, xenvif_poll
,
633 if (tx_evtchn
== rx_evtchn
) {
634 /* feature-split-event-channels == 0 */
635 err
= bind_interdomain_evtchn_to_irqhandler(
636 queue
->vif
->domid
, tx_evtchn
, xenvif_interrupt
, 0,
640 queue
->tx_irq
= queue
->rx_irq
= err
;
641 disable_irq(queue
->tx_irq
);
643 /* feature-split-event-channels == 1 */
644 snprintf(queue
->tx_irq_name
, sizeof(queue
->tx_irq_name
),
645 "%s-tx", queue
->name
);
646 err
= bind_interdomain_evtchn_to_irqhandler(
647 queue
->vif
->domid
, tx_evtchn
, xenvif_tx_interrupt
, 0,
648 queue
->tx_irq_name
, queue
);
652 disable_irq(queue
->tx_irq
);
654 snprintf(queue
->rx_irq_name
, sizeof(queue
->rx_irq_name
),
655 "%s-rx", queue
->name
);
656 err
= bind_interdomain_evtchn_to_irqhandler(
657 queue
->vif
->domid
, rx_evtchn
, xenvif_rx_interrupt
, 0,
658 queue
->rx_irq_name
, queue
);
662 disable_irq(queue
->rx_irq
);
665 queue
->stalled
= true;
667 task
= kthread_create(xenvif_kthread_guest_rx
,
668 (void *)queue
, "%s-guest-rx", queue
->name
);
670 pr_warn("Could not allocate kthread for %s\n", queue
->name
);
675 get_task_struct(task
);
677 task
= kthread_create(xenvif_dealloc_kthread
,
678 (void *)queue
, "%s-dealloc", queue
->name
);
680 pr_warn("Could not allocate kthread for %s\n", queue
->name
);
684 queue
->dealloc_task
= task
;
686 wake_up_process(queue
->task
);
687 wake_up_process(queue
->dealloc_task
);
692 unbind_from_irqhandler(queue
->rx_irq
, queue
);
695 unbind_from_irqhandler(queue
->tx_irq
, queue
);
698 xenvif_unmap_frontend_data_rings(queue
);
699 netif_napi_del(&queue
->napi
);
701 module_put(THIS_MODULE
);
705 void xenvif_carrier_off(struct xenvif
*vif
)
707 struct net_device
*dev
= vif
->dev
;
710 if (test_and_clear_bit(VIF_STATUS_CONNECTED
, &vif
->status
)) {
711 netif_carrier_off(dev
); /* discard queued packets */
712 if (netif_running(dev
))
718 void xenvif_disconnect_data(struct xenvif
*vif
)
720 struct xenvif_queue
*queue
= NULL
;
721 unsigned int num_queues
= vif
->num_queues
;
722 unsigned int queue_index
;
724 xenvif_carrier_off(vif
);
726 for (queue_index
= 0; queue_index
< num_queues
; ++queue_index
) {
727 queue
= &vif
->queues
[queue_index
];
729 netif_napi_del(&queue
->napi
);
732 kthread_stop(queue
->task
);
733 put_task_struct(queue
->task
);
737 if (queue
->dealloc_task
) {
738 kthread_stop(queue
->dealloc_task
);
739 queue
->dealloc_task
= NULL
;
743 if (queue
->tx_irq
== queue
->rx_irq
)
744 unbind_from_irqhandler(queue
->tx_irq
, queue
);
746 unbind_from_irqhandler(queue
->tx_irq
, queue
);
747 unbind_from_irqhandler(queue
->rx_irq
, queue
);
752 xenvif_unmap_frontend_data_rings(queue
);
755 xenvif_mcast_addr_list_free(vif
);
758 void xenvif_disconnect_ctrl(struct xenvif
*vif
)
761 xenvif_deinit_hash(vif
);
762 unbind_from_irqhandler(vif
->ctrl_irq
, vif
);
766 if (vif
->ctrl
.sring
) {
767 xenbus_unmap_ring_vfree(xenvif_to_xenbus_device(vif
),
769 vif
->ctrl
.sring
= NULL
;
773 /* Reverse the relevant parts of xenvif_init_queue().
774 * Used for queue teardown from xenvif_free(), and on the
775 * error handling paths in xenbus.c:connect().
777 void xenvif_deinit_queue(struct xenvif_queue
*queue
)
779 gnttab_free_pages(MAX_PENDING_REQS
, queue
->mmap_pages
);
782 void xenvif_free(struct xenvif
*vif
)
784 struct xenvif_queue
*queues
= vif
->queues
;
785 unsigned int num_queues
= vif
->num_queues
;
786 unsigned int queue_index
;
788 unregister_netdev(vif
->dev
);
789 free_netdev(vif
->dev
);
791 for (queue_index
= 0; queue_index
< num_queues
; ++queue_index
)
792 xenvif_deinit_queue(&queues
[queue_index
]);
795 module_put(THIS_MODULE
);