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 irqreturn_t
xenvif_tx_interrupt(int irq
, void *dev_id
)
82 struct xenvif_queue
*queue
= dev_id
;
84 if (RING_HAS_UNCONSUMED_REQUESTS(&queue
->tx
))
85 napi_schedule(&queue
->napi
);
90 static int xenvif_poll(struct napi_struct
*napi
, int budget
)
92 struct xenvif_queue
*queue
=
93 container_of(napi
, struct xenvif_queue
, napi
);
96 /* This vif is rogue, we pretend we've there is nothing to do
97 * for this vif to deschedule it from NAPI. But this interface
98 * will be turned off in thread context later.
100 if (unlikely(queue
->vif
->disabled
)) {
105 work_done
= xenvif_tx_action(queue
, budget
);
107 if (work_done
< budget
) {
108 napi_complete_done(napi
, work_done
);
109 /* If the queue is rate-limited, it shall be
110 * rescheduled in the timer callback.
112 if (likely(!queue
->rate_limited
))
113 xenvif_napi_schedule_or_enable_events(queue
);
119 static irqreturn_t
xenvif_rx_interrupt(int irq
, void *dev_id
)
121 struct xenvif_queue
*queue
= dev_id
;
123 xenvif_kick_thread(queue
);
128 irqreturn_t
xenvif_interrupt(int irq
, void *dev_id
)
130 xenvif_tx_interrupt(irq
, dev_id
);
131 xenvif_rx_interrupt(irq
, dev_id
);
136 int xenvif_queue_stopped(struct xenvif_queue
*queue
)
138 struct net_device
*dev
= queue
->vif
->dev
;
139 unsigned int id
= queue
->id
;
140 return netif_tx_queue_stopped(netdev_get_tx_queue(dev
, id
));
143 void xenvif_wake_queue(struct xenvif_queue
*queue
)
145 struct net_device
*dev
= queue
->vif
->dev
;
146 unsigned int id
= queue
->id
;
147 netif_tx_wake_queue(netdev_get_tx_queue(dev
, id
));
150 static u16
xenvif_select_queue(struct net_device
*dev
, struct sk_buff
*skb
,
152 select_queue_fallback_t fallback
)
154 struct xenvif
*vif
= netdev_priv(dev
);
155 unsigned int size
= vif
->hash
.size
;
157 if (vif
->hash
.alg
== XEN_NETIF_CTRL_HASH_ALGORITHM_NONE
)
158 return fallback(dev
, skb
) % dev
->real_num_tx_queues
;
160 xenvif_set_skb_hash(vif
, skb
);
163 return skb_get_hash_raw(skb
) % dev
->real_num_tx_queues
;
165 return vif
->hash
.mapping
[skb_get_hash_raw(skb
) % size
];
168 static int xenvif_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
170 struct xenvif
*vif
= netdev_priv(dev
);
171 struct xenvif_queue
*queue
= NULL
;
172 unsigned int num_queues
;
174 struct xenvif_rx_cb
*cb
;
176 BUG_ON(skb
->dev
!= dev
);
178 /* Drop the packet if queues are not set up.
179 * This handler should be called inside an RCU read section
180 * so we don't need to enter it here explicitly.
182 num_queues
= READ_ONCE(vif
->num_queues
);
186 /* Obtain the queue to be used to transmit this packet */
187 index
= skb_get_queue_mapping(skb
);
188 if (index
>= num_queues
) {
189 pr_warn_ratelimited("Invalid queue %hu for packet on interface %s\n",
190 index
, vif
->dev
->name
);
193 queue
= &vif
->queues
[index
];
195 /* Drop the packet if queue is not ready */
196 if (queue
->task
== NULL
||
197 queue
->dealloc_task
== NULL
||
198 !xenvif_schedulable(vif
))
201 if (vif
->multicast_control
&& skb
->pkt_type
== PACKET_MULTICAST
) {
202 struct ethhdr
*eth
= (struct ethhdr
*)skb
->data
;
204 if (!xenvif_mcast_match(vif
, eth
->h_dest
))
208 cb
= XENVIF_RX_CB(skb
);
209 cb
->expires
= jiffies
+ vif
->drain_timeout
;
211 /* If there is no hash algorithm configured then make sure there
212 * is no hash information in the socket buffer otherwise it
213 * would be incorrectly forwarded to the frontend.
215 if (vif
->hash
.alg
== XEN_NETIF_CTRL_HASH_ALGORITHM_NONE
)
218 xenvif_rx_queue_tail(queue
, skb
);
219 xenvif_kick_thread(queue
);
224 vif
->dev
->stats
.tx_dropped
++;
229 static struct net_device_stats
*xenvif_get_stats(struct net_device
*dev
)
231 struct xenvif
*vif
= netdev_priv(dev
);
232 struct xenvif_queue
*queue
= NULL
;
233 unsigned int num_queues
;
241 num_queues
= READ_ONCE(vif
->num_queues
);
243 /* Aggregate tx and rx stats from each queue */
244 for (index
= 0; index
< num_queues
; ++index
) {
245 queue
= &vif
->queues
[index
];
246 rx_bytes
+= queue
->stats
.rx_bytes
;
247 rx_packets
+= queue
->stats
.rx_packets
;
248 tx_bytes
+= queue
->stats
.tx_bytes
;
249 tx_packets
+= queue
->stats
.tx_packets
;
254 vif
->dev
->stats
.rx_bytes
= rx_bytes
;
255 vif
->dev
->stats
.rx_packets
= rx_packets
;
256 vif
->dev
->stats
.tx_bytes
= tx_bytes
;
257 vif
->dev
->stats
.tx_packets
= tx_packets
;
259 return &vif
->dev
->stats
;
262 static void xenvif_up(struct xenvif
*vif
)
264 struct xenvif_queue
*queue
= NULL
;
265 unsigned int num_queues
= vif
->num_queues
;
266 unsigned int queue_index
;
268 for (queue_index
= 0; queue_index
< num_queues
; ++queue_index
) {
269 queue
= &vif
->queues
[queue_index
];
270 napi_enable(&queue
->napi
);
271 enable_irq(queue
->tx_irq
);
272 if (queue
->tx_irq
!= queue
->rx_irq
)
273 enable_irq(queue
->rx_irq
);
274 xenvif_napi_schedule_or_enable_events(queue
);
278 static void xenvif_down(struct xenvif
*vif
)
280 struct xenvif_queue
*queue
= NULL
;
281 unsigned int num_queues
= vif
->num_queues
;
282 unsigned int queue_index
;
284 for (queue_index
= 0; queue_index
< num_queues
; ++queue_index
) {
285 queue
= &vif
->queues
[queue_index
];
286 disable_irq(queue
->tx_irq
);
287 if (queue
->tx_irq
!= queue
->rx_irq
)
288 disable_irq(queue
->rx_irq
);
289 napi_disable(&queue
->napi
);
290 del_timer_sync(&queue
->credit_timeout
);
294 static int xenvif_open(struct net_device
*dev
)
296 struct xenvif
*vif
= netdev_priv(dev
);
297 if (test_bit(VIF_STATUS_CONNECTED
, &vif
->status
))
299 netif_tx_start_all_queues(dev
);
303 static int xenvif_close(struct net_device
*dev
)
305 struct xenvif
*vif
= netdev_priv(dev
);
306 if (test_bit(VIF_STATUS_CONNECTED
, &vif
->status
))
308 netif_tx_stop_all_queues(dev
);
312 static int xenvif_change_mtu(struct net_device
*dev
, int mtu
)
314 struct xenvif
*vif
= netdev_priv(dev
);
315 int max
= vif
->can_sg
? ETH_MAX_MTU
- VLAN_ETH_HLEN
: ETH_DATA_LEN
;
323 static netdev_features_t
xenvif_fix_features(struct net_device
*dev
,
324 netdev_features_t features
)
326 struct xenvif
*vif
= netdev_priv(dev
);
329 features
&= ~NETIF_F_SG
;
330 if (~(vif
->gso_mask
) & GSO_BIT(TCPV4
))
331 features
&= ~NETIF_F_TSO
;
332 if (~(vif
->gso_mask
) & GSO_BIT(TCPV6
))
333 features
&= ~NETIF_F_TSO6
;
335 features
&= ~NETIF_F_IP_CSUM
;
337 features
&= ~NETIF_F_IPV6_CSUM
;
342 static const struct xenvif_stat
{
343 char name
[ETH_GSTRING_LEN
];
347 "rx_gso_checksum_fixup",
348 offsetof(struct xenvif_stats
, rx_gso_checksum_fixup
)
350 /* If (sent != success + fail), there are probably packets never
355 offsetof(struct xenvif_stats
, tx_zerocopy_sent
),
358 "tx_zerocopy_success",
359 offsetof(struct xenvif_stats
, tx_zerocopy_success
),
363 offsetof(struct xenvif_stats
, tx_zerocopy_fail
)
365 /* Number of packets exceeding MAX_SKB_FRAG slots. You should use
366 * a guest with the same MAX_SKB_FRAG
370 offsetof(struct xenvif_stats
, tx_frag_overflow
)
374 static int xenvif_get_sset_count(struct net_device
*dev
, int string_set
)
376 switch (string_set
) {
378 return ARRAY_SIZE(xenvif_stats
);
384 static void xenvif_get_ethtool_stats(struct net_device
*dev
,
385 struct ethtool_stats
*stats
, u64
* data
)
387 struct xenvif
*vif
= netdev_priv(dev
);
388 unsigned int num_queues
;
390 unsigned int queue_index
;
393 num_queues
= READ_ONCE(vif
->num_queues
);
395 for (i
= 0; i
< ARRAY_SIZE(xenvif_stats
); i
++) {
396 unsigned long accum
= 0;
397 for (queue_index
= 0; queue_index
< num_queues
; ++queue_index
) {
398 void *vif_stats
= &vif
->queues
[queue_index
].stats
;
399 accum
+= *(unsigned long *)(vif_stats
+ xenvif_stats
[i
].offset
);
407 static void xenvif_get_strings(struct net_device
*dev
, u32 stringset
, u8
* data
)
413 for (i
= 0; i
< ARRAY_SIZE(xenvif_stats
); i
++)
414 memcpy(data
+ i
* ETH_GSTRING_LEN
,
415 xenvif_stats
[i
].name
, ETH_GSTRING_LEN
);
420 static const struct ethtool_ops xenvif_ethtool_ops
= {
421 .get_link
= ethtool_op_get_link
,
423 .get_sset_count
= xenvif_get_sset_count
,
424 .get_ethtool_stats
= xenvif_get_ethtool_stats
,
425 .get_strings
= xenvif_get_strings
,
428 static const struct net_device_ops xenvif_netdev_ops
= {
429 .ndo_select_queue
= xenvif_select_queue
,
430 .ndo_start_xmit
= xenvif_start_xmit
,
431 .ndo_get_stats
= xenvif_get_stats
,
432 .ndo_open
= xenvif_open
,
433 .ndo_stop
= xenvif_close
,
434 .ndo_change_mtu
= xenvif_change_mtu
,
435 .ndo_fix_features
= xenvif_fix_features
,
436 .ndo_set_mac_address
= eth_mac_addr
,
437 .ndo_validate_addr
= eth_validate_addr
,
440 struct xenvif
*xenvif_alloc(struct device
*parent
, domid_t domid
,
444 struct net_device
*dev
;
446 char name
[IFNAMSIZ
] = {};
448 snprintf(name
, IFNAMSIZ
- 1, "vif%u.%u", domid
, handle
);
449 /* Allocate a netdev with the max. supported number of queues.
450 * When the guest selects the desired number, it will be updated
451 * via netif_set_real_num_*_queues().
453 dev
= alloc_netdev_mq(sizeof(struct xenvif
), name
, NET_NAME_UNKNOWN
,
454 ether_setup
, xenvif_max_queues
);
456 pr_warn("Could not allocate netdev for %s\n", name
);
457 return ERR_PTR(-ENOMEM
);
460 SET_NETDEV_DEV(dev
, parent
);
462 vif
= netdev_priv(dev
);
465 vif
->handle
= handle
;
469 vif
->disabled
= false;
470 vif
->drain_timeout
= msecs_to_jiffies(rx_drain_timeout_msecs
);
471 vif
->stall_timeout
= msecs_to_jiffies(rx_stall_timeout_msecs
);
473 /* Start out with no queues. */
477 spin_lock_init(&vif
->lock
);
478 INIT_LIST_HEAD(&vif
->fe_mcast_addr
);
480 dev
->netdev_ops
= &xenvif_netdev_ops
;
481 dev
->hw_features
= NETIF_F_SG
|
482 NETIF_F_IP_CSUM
| NETIF_F_IPV6_CSUM
|
483 NETIF_F_TSO
| NETIF_F_TSO6
| NETIF_F_FRAGLIST
;
484 dev
->features
= dev
->hw_features
| NETIF_F_RXCSUM
;
485 dev
->ethtool_ops
= &xenvif_ethtool_ops
;
487 dev
->tx_queue_len
= XENVIF_QUEUE_LENGTH
;
489 dev
->min_mtu
= ETH_MIN_MTU
;
490 dev
->max_mtu
= ETH_MAX_MTU
- VLAN_ETH_HLEN
;
493 * Initialise a dummy MAC address. We choose the numerically
494 * largest non-broadcast address to prevent the address getting
495 * stolen by an Ethernet bridge for STP purposes.
496 * (FE:FF:FF:FF:FF:FF)
498 eth_broadcast_addr(dev
->dev_addr
);
499 dev
->dev_addr
[0] &= ~0x01;
501 netif_carrier_off(dev
);
503 err
= register_netdev(dev
);
505 netdev_warn(dev
, "Could not register device: err=%d\n", err
);
510 netdev_dbg(dev
, "Successfully created xenvif\n");
512 __module_get(THIS_MODULE
);
517 int xenvif_init_queue(struct xenvif_queue
*queue
)
521 queue
->credit_bytes
= queue
->remaining_credit
= ~0UL;
522 queue
->credit_usec
= 0UL;
523 timer_setup(&queue
->credit_timeout
, xenvif_tx_credit_callback
, 0);
524 queue
->credit_window_start
= get_jiffies_64();
526 queue
->rx_queue_max
= XENVIF_RX_QUEUE_BYTES
;
528 skb_queue_head_init(&queue
->rx_queue
);
529 skb_queue_head_init(&queue
->tx_queue
);
531 queue
->pending_cons
= 0;
532 queue
->pending_prod
= MAX_PENDING_REQS
;
533 for (i
= 0; i
< MAX_PENDING_REQS
; ++i
)
534 queue
->pending_ring
[i
] = i
;
536 spin_lock_init(&queue
->callback_lock
);
537 spin_lock_init(&queue
->response_lock
);
539 /* If ballooning is disabled, this will consume real memory, so you
540 * better enable it. The long term solution would be to use just a
541 * bunch of valid page descriptors, without dependency on ballooning
543 err
= gnttab_alloc_pages(MAX_PENDING_REQS
,
546 netdev_err(queue
->vif
->dev
, "Could not reserve mmap_pages\n");
550 for (i
= 0; i
< MAX_PENDING_REQS
; i
++) {
551 queue
->pending_tx_info
[i
].callback_struct
= (struct ubuf_info
)
552 { .callback
= xenvif_zerocopy_callback
,
555 queue
->grant_tx_handle
[i
] = NETBACK_INVALID_HANDLE
;
561 void xenvif_carrier_on(struct xenvif
*vif
)
564 if (!vif
->can_sg
&& vif
->dev
->mtu
> ETH_DATA_LEN
)
565 dev_set_mtu(vif
->dev
, ETH_DATA_LEN
);
566 netdev_update_features(vif
->dev
);
567 set_bit(VIF_STATUS_CONNECTED
, &vif
->status
);
568 if (netif_running(vif
->dev
))
573 int xenvif_connect_ctrl(struct xenvif
*vif
, grant_ref_t ring_ref
,
576 struct net_device
*dev
= vif
->dev
;
578 struct xen_netif_ctrl_sring
*shared
;
581 err
= xenbus_map_ring_valloc(xenvif_to_xenbus_device(vif
),
582 &ring_ref
, 1, &addr
);
586 shared
= (struct xen_netif_ctrl_sring
*)addr
;
587 BACK_RING_INIT(&vif
->ctrl
, shared
, XEN_PAGE_SIZE
);
589 err
= bind_interdomain_evtchn_to_irq(vif
->domid
, evtchn
);
595 xenvif_init_hash(vif
);
597 err
= request_threaded_irq(vif
->ctrl_irq
, NULL
, xenvif_ctrl_irq_fn
,
598 IRQF_ONESHOT
, "xen-netback-ctrl", vif
);
600 pr_warn("Could not setup irq handler for %s\n", dev
->name
);
607 xenvif_deinit_hash(vif
);
608 unbind_from_irqhandler(vif
->ctrl_irq
, vif
);
612 xenbus_unmap_ring_vfree(xenvif_to_xenbus_device(vif
),
614 vif
->ctrl
.sring
= NULL
;
620 int xenvif_connect_data(struct xenvif_queue
*queue
,
621 unsigned long tx_ring_ref
,
622 unsigned long rx_ring_ref
,
623 unsigned int tx_evtchn
,
624 unsigned int rx_evtchn
)
626 struct task_struct
*task
;
629 BUG_ON(queue
->tx_irq
);
631 BUG_ON(queue
->dealloc_task
);
633 err
= xenvif_map_frontend_data_rings(queue
, tx_ring_ref
,
638 init_waitqueue_head(&queue
->wq
);
639 init_waitqueue_head(&queue
->dealloc_wq
);
640 atomic_set(&queue
->inflight_packets
, 0);
642 netif_napi_add(queue
->vif
->dev
, &queue
->napi
, xenvif_poll
,
645 if (tx_evtchn
== rx_evtchn
) {
646 /* feature-split-event-channels == 0 */
647 err
= bind_interdomain_evtchn_to_irqhandler(
648 queue
->vif
->domid
, tx_evtchn
, xenvif_interrupt
, 0,
652 queue
->tx_irq
= queue
->rx_irq
= err
;
653 disable_irq(queue
->tx_irq
);
655 /* feature-split-event-channels == 1 */
656 snprintf(queue
->tx_irq_name
, sizeof(queue
->tx_irq_name
),
657 "%s-tx", queue
->name
);
658 err
= bind_interdomain_evtchn_to_irqhandler(
659 queue
->vif
->domid
, tx_evtchn
, xenvif_tx_interrupt
, 0,
660 queue
->tx_irq_name
, queue
);
664 disable_irq(queue
->tx_irq
);
666 snprintf(queue
->rx_irq_name
, sizeof(queue
->rx_irq_name
),
667 "%s-rx", queue
->name
);
668 err
= bind_interdomain_evtchn_to_irqhandler(
669 queue
->vif
->domid
, rx_evtchn
, xenvif_rx_interrupt
, 0,
670 queue
->rx_irq_name
, queue
);
674 disable_irq(queue
->rx_irq
);
677 queue
->stalled
= true;
679 task
= kthread_create(xenvif_kthread_guest_rx
,
680 (void *)queue
, "%s-guest-rx", queue
->name
);
682 pr_warn("Could not allocate kthread for %s\n", queue
->name
);
687 get_task_struct(task
);
689 task
= kthread_create(xenvif_dealloc_kthread
,
690 (void *)queue
, "%s-dealloc", queue
->name
);
692 pr_warn("Could not allocate kthread for %s\n", queue
->name
);
696 queue
->dealloc_task
= task
;
698 wake_up_process(queue
->task
);
699 wake_up_process(queue
->dealloc_task
);
704 unbind_from_irqhandler(queue
->rx_irq
, queue
);
707 unbind_from_irqhandler(queue
->tx_irq
, queue
);
710 xenvif_unmap_frontend_data_rings(queue
);
711 netif_napi_del(&queue
->napi
);
713 module_put(THIS_MODULE
);
717 void xenvif_carrier_off(struct xenvif
*vif
)
719 struct net_device
*dev
= vif
->dev
;
722 if (test_and_clear_bit(VIF_STATUS_CONNECTED
, &vif
->status
)) {
723 netif_carrier_off(dev
); /* discard queued packets */
724 if (netif_running(dev
))
730 void xenvif_disconnect_data(struct xenvif
*vif
)
732 struct xenvif_queue
*queue
= NULL
;
733 unsigned int num_queues
= vif
->num_queues
;
734 unsigned int queue_index
;
736 xenvif_carrier_off(vif
);
738 for (queue_index
= 0; queue_index
< num_queues
; ++queue_index
) {
739 queue
= &vif
->queues
[queue_index
];
741 netif_napi_del(&queue
->napi
);
744 kthread_stop(queue
->task
);
745 put_task_struct(queue
->task
);
749 if (queue
->dealloc_task
) {
750 kthread_stop(queue
->dealloc_task
);
751 queue
->dealloc_task
= NULL
;
755 if (queue
->tx_irq
== queue
->rx_irq
)
756 unbind_from_irqhandler(queue
->tx_irq
, queue
);
758 unbind_from_irqhandler(queue
->tx_irq
, queue
);
759 unbind_from_irqhandler(queue
->rx_irq
, queue
);
764 xenvif_unmap_frontend_data_rings(queue
);
767 xenvif_mcast_addr_list_free(vif
);
770 void xenvif_disconnect_ctrl(struct xenvif
*vif
)
773 xenvif_deinit_hash(vif
);
774 unbind_from_irqhandler(vif
->ctrl_irq
, vif
);
778 if (vif
->ctrl
.sring
) {
779 xenbus_unmap_ring_vfree(xenvif_to_xenbus_device(vif
),
781 vif
->ctrl
.sring
= NULL
;
785 /* Reverse the relevant parts of xenvif_init_queue().
786 * Used for queue teardown from xenvif_free(), and on the
787 * error handling paths in xenbus.c:connect().
789 void xenvif_deinit_queue(struct xenvif_queue
*queue
)
791 gnttab_free_pages(MAX_PENDING_REQS
, queue
->mmap_pages
);
794 void xenvif_free(struct xenvif
*vif
)
796 struct xenvif_queue
*queues
= vif
->queues
;
797 unsigned int num_queues
= vif
->num_queues
;
798 unsigned int queue_index
;
800 unregister_netdev(vif
->dev
);
801 free_netdev(vif
->dev
);
803 for (queue_index
= 0; queue_index
< num_queues
; ++queue_index
)
804 xenvif_deinit_queue(&queues
[queue_index
]);
807 module_put(THIS_MODULE
);