1 /* A simple network driver using virtio.
3 * Copyright 2007 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 #include <linux/netdevice.h>
21 #include <linux/etherdevice.h>
22 #include <linux/ethtool.h>
23 #include <linux/module.h>
24 #include <linux/virtio.h>
25 #include <linux/virtio_net.h>
26 #include <linux/scatterlist.h>
28 static int napi_weight
= 128;
29 module_param(napi_weight
, int, 0444);
31 static int csum
= 1, gso
= 1;
32 module_param(csum
, bool, 0444);
33 module_param(gso
, bool, 0444);
35 /* FIXME: MTU in config. */
36 #define MAX_PACKET_LEN (ETH_HLEN+ETH_DATA_LEN)
37 #define GOOD_COPY_LEN 128
41 struct virtio_device
*vdev
;
42 struct virtqueue
*rvq
, *svq
;
43 struct net_device
*dev
;
44 struct napi_struct napi
;
46 /* The skb we couldn't send because buffers were full. */
47 struct sk_buff
*last_xmit_skb
;
49 /* If we need to free in a timer, this is it. */
50 struct timer_list xmit_free_timer
;
52 /* Number of input buffers, and max we've ever had. */
53 unsigned int num
, max
;
55 /* For cleaning up after transmission. */
56 struct tasklet_struct tasklet
;
59 /* I like... big packets and I cannot lie! */
62 /* Host will merge rx buffers for big packets (shake it! shake it!) */
63 bool mergeable_rx_bufs
;
65 /* Receive & send queues. */
66 struct sk_buff_head recv
;
67 struct sk_buff_head send
;
69 /* Chain pages by the private ptr. */
73 static inline void *skb_vnet_hdr(struct sk_buff
*skb
)
75 return (struct virtio_net_hdr
*)skb
->cb
;
78 static void give_a_page(struct virtnet_info
*vi
, struct page
*page
)
80 page
->private = (unsigned long)vi
->pages
;
84 static void trim_pages(struct virtnet_info
*vi
, struct sk_buff
*skb
)
88 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++)
89 give_a_page(vi
, skb_shinfo(skb
)->frags
[i
].page
);
90 skb_shinfo(skb
)->nr_frags
= 0;
94 static struct page
*get_a_page(struct virtnet_info
*vi
, gfp_t gfp_mask
)
96 struct page
*p
= vi
->pages
;
99 vi
->pages
= (struct page
*)p
->private;
101 p
= alloc_page(gfp_mask
);
105 static void skb_xmit_done(struct virtqueue
*svq
)
107 struct virtnet_info
*vi
= svq
->vdev
->priv
;
109 /* Suppress further interrupts. */
110 svq
->vq_ops
->disable_cb(svq
);
112 /* We were probably waiting for more output buffers. */
113 netif_wake_queue(vi
->dev
);
115 /* Make sure we re-xmit last_xmit_skb: if there are no more packets
116 * queued, start_xmit won't be called. */
117 tasklet_schedule(&vi
->tasklet
);
120 static void receive_skb(struct net_device
*dev
, struct sk_buff
*skb
,
123 struct virtnet_info
*vi
= netdev_priv(dev
);
124 struct virtio_net_hdr
*hdr
= skb_vnet_hdr(skb
);
128 if (unlikely(len
< sizeof(struct virtio_net_hdr
) + ETH_HLEN
)) {
129 pr_debug("%s: short packet %i\n", dev
->name
, len
);
130 dev
->stats
.rx_length_errors
++;
134 if (vi
->mergeable_rx_bufs
) {
135 struct virtio_net_hdr_mrg_rxbuf
*mhdr
= skb_vnet_hdr(skb
);
137 char *p
= page_address(skb_shinfo(skb
)->frags
[0].page
);
141 len
-= sizeof(struct virtio_net_hdr_mrg_rxbuf
);
143 memcpy(hdr
, p
, sizeof(*mhdr
));
147 if (copy
> skb_tailroom(skb
))
148 copy
= skb_tailroom(skb
);
150 memcpy(skb_put(skb
, copy
), p
, copy
);
155 give_a_page(vi
, skb_shinfo(skb
)->frags
[0].page
);
156 skb_shinfo(skb
)->nr_frags
--;
158 skb_shinfo(skb
)->frags
[0].page_offset
+=
159 sizeof(*mhdr
) + copy
;
160 skb_shinfo(skb
)->frags
[0].size
= len
;
161 skb
->data_len
+= len
;
165 while (--mhdr
->num_buffers
) {
166 struct sk_buff
*nskb
;
168 i
= skb_shinfo(skb
)->nr_frags
;
169 if (i
>= MAX_SKB_FRAGS
) {
170 pr_debug("%s: packet too long %d\n", dev
->name
,
172 dev
->stats
.rx_length_errors
++;
176 nskb
= vi
->rvq
->vq_ops
->get_buf(vi
->rvq
, &len
);
178 pr_debug("%s: rx error: %d buffers missing\n",
179 dev
->name
, mhdr
->num_buffers
);
180 dev
->stats
.rx_length_errors
++;
184 __skb_unlink(nskb
, &vi
->recv
);
187 skb_shinfo(skb
)->frags
[i
] = skb_shinfo(nskb
)->frags
[0];
188 skb_shinfo(nskb
)->nr_frags
= 0;
194 skb_shinfo(skb
)->frags
[i
].size
= len
;
195 skb_shinfo(skb
)->nr_frags
++;
196 skb
->data_len
+= len
;
200 len
-= sizeof(struct virtio_net_hdr
);
202 if (len
<= MAX_PACKET_LEN
)
205 err
= pskb_trim(skb
, len
);
207 pr_debug("%s: pskb_trim failed %i %d\n", dev
->name
,
209 dev
->stats
.rx_dropped
++;
214 skb
->truesize
+= skb
->data_len
;
215 dev
->stats
.rx_bytes
+= skb
->len
;
216 dev
->stats
.rx_packets
++;
218 if (hdr
->flags
& VIRTIO_NET_HDR_F_NEEDS_CSUM
) {
219 pr_debug("Needs csum!\n");
220 if (!skb_partial_csum_set(skb
,hdr
->csum_start
,hdr
->csum_offset
))
224 skb
->protocol
= eth_type_trans(skb
, dev
);
225 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
226 ntohs(skb
->protocol
), skb
->len
, skb
->pkt_type
);
228 if (hdr
->gso_type
!= VIRTIO_NET_HDR_GSO_NONE
) {
230 switch (hdr
->gso_type
& ~VIRTIO_NET_HDR_GSO_ECN
) {
231 case VIRTIO_NET_HDR_GSO_TCPV4
:
232 skb_shinfo(skb
)->gso_type
= SKB_GSO_TCPV4
;
234 case VIRTIO_NET_HDR_GSO_UDP
:
235 skb_shinfo(skb
)->gso_type
= SKB_GSO_UDP
;
237 case VIRTIO_NET_HDR_GSO_TCPV6
:
238 skb_shinfo(skb
)->gso_type
= SKB_GSO_TCPV6
;
242 printk(KERN_WARNING
"%s: bad gso type %u.\n",
243 dev
->name
, hdr
->gso_type
);
247 if (hdr
->gso_type
& VIRTIO_NET_HDR_GSO_ECN
)
248 skb_shinfo(skb
)->gso_type
|= SKB_GSO_TCP_ECN
;
250 skb_shinfo(skb
)->gso_size
= hdr
->gso_size
;
251 if (skb_shinfo(skb
)->gso_size
== 0) {
253 printk(KERN_WARNING
"%s: zero gso size.\n",
258 /* Header must be checked, and gso_segs computed. */
259 skb_shinfo(skb
)->gso_type
|= SKB_GSO_DODGY
;
260 skb_shinfo(skb
)->gso_segs
= 0;
263 netif_receive_skb(skb
);
267 dev
->stats
.rx_frame_errors
++;
272 static void try_fill_recv_maxbufs(struct virtnet_info
*vi
)
275 struct scatterlist sg
[2+MAX_SKB_FRAGS
];
278 sg_init_table(sg
, 2+MAX_SKB_FRAGS
);
280 struct virtio_net_hdr
*hdr
;
282 skb
= netdev_alloc_skb(vi
->dev
, MAX_PACKET_LEN
);
286 skb_put(skb
, MAX_PACKET_LEN
);
288 hdr
= skb_vnet_hdr(skb
);
289 sg_init_one(sg
, hdr
, sizeof(*hdr
));
291 if (vi
->big_packets
) {
292 for (i
= 0; i
< MAX_SKB_FRAGS
; i
++) {
293 skb_frag_t
*f
= &skb_shinfo(skb
)->frags
[i
];
294 f
->page
= get_a_page(vi
, GFP_ATOMIC
);
301 skb
->data_len
+= PAGE_SIZE
;
302 skb
->len
+= PAGE_SIZE
;
304 skb_shinfo(skb
)->nr_frags
++;
308 num
= skb_to_sgvec(skb
, sg
+1, 0, skb
->len
) + 1;
309 skb_queue_head(&vi
->recv
, skb
);
311 err
= vi
->rvq
->vq_ops
->add_buf(vi
->rvq
, sg
, 0, num
, skb
);
313 skb_unlink(skb
, &vi
->recv
);
320 if (unlikely(vi
->num
> vi
->max
))
322 vi
->rvq
->vq_ops
->kick(vi
->rvq
);
325 static void try_fill_recv(struct virtnet_info
*vi
)
328 struct scatterlist sg
[1];
331 if (!vi
->mergeable_rx_bufs
) {
332 try_fill_recv_maxbufs(vi
);
339 skb
= netdev_alloc_skb(vi
->dev
, GOOD_COPY_LEN
+ NET_IP_ALIGN
);
343 skb_reserve(skb
, NET_IP_ALIGN
);
345 f
= &skb_shinfo(skb
)->frags
[0];
346 f
->page
= get_a_page(vi
, GFP_ATOMIC
);
355 skb_shinfo(skb
)->nr_frags
++;
357 sg_init_one(sg
, page_address(f
->page
), PAGE_SIZE
);
358 skb_queue_head(&vi
->recv
, skb
);
360 err
= vi
->rvq
->vq_ops
->add_buf(vi
->rvq
, sg
, 0, 1, skb
);
362 skb_unlink(skb
, &vi
->recv
);
368 if (unlikely(vi
->num
> vi
->max
))
370 vi
->rvq
->vq_ops
->kick(vi
->rvq
);
373 static void skb_recv_done(struct virtqueue
*rvq
)
375 struct virtnet_info
*vi
= rvq
->vdev
->priv
;
376 /* Schedule NAPI, Suppress further interrupts if successful. */
377 if (napi_schedule_prep(&vi
->napi
)) {
378 rvq
->vq_ops
->disable_cb(rvq
);
379 __napi_schedule(&vi
->napi
);
383 static int virtnet_poll(struct napi_struct
*napi
, int budget
)
385 struct virtnet_info
*vi
= container_of(napi
, struct virtnet_info
, napi
);
386 struct sk_buff
*skb
= NULL
;
387 unsigned int len
, received
= 0;
390 while (received
< budget
&&
391 (skb
= vi
->rvq
->vq_ops
->get_buf(vi
->rvq
, &len
)) != NULL
) {
392 __skb_unlink(skb
, &vi
->recv
);
393 receive_skb(vi
->dev
, skb
, len
);
398 /* FIXME: If we oom and completely run out of inbufs, we need
399 * to start a timer trying to fill more. */
400 if (vi
->num
< vi
->max
/ 2)
403 /* Out of packets? */
404 if (received
< budget
) {
406 if (unlikely(!vi
->rvq
->vq_ops
->enable_cb(vi
->rvq
))
407 && napi_schedule_prep(napi
)) {
408 vi
->rvq
->vq_ops
->disable_cb(vi
->rvq
);
409 __napi_schedule(napi
);
417 static void free_old_xmit_skbs(struct virtnet_info
*vi
)
422 while ((skb
= vi
->svq
->vq_ops
->get_buf(vi
->svq
, &len
)) != NULL
) {
423 pr_debug("Sent skb %p\n", skb
);
424 __skb_unlink(skb
, &vi
->send
);
425 vi
->dev
->stats
.tx_bytes
+= skb
->len
;
426 vi
->dev
->stats
.tx_packets
++;
431 /* If the virtio transport doesn't always notify us when all in-flight packets
432 * are consumed, we fall back to using this function on a timer to free them. */
433 static void xmit_free(unsigned long data
)
435 struct virtnet_info
*vi
= (void *)data
;
437 netif_tx_lock(vi
->dev
);
439 free_old_xmit_skbs(vi
);
441 if (!skb_queue_empty(&vi
->send
))
442 mod_timer(&vi
->xmit_free_timer
, jiffies
+ (HZ
/10));
444 netif_tx_unlock(vi
->dev
);
447 static int xmit_skb(struct virtnet_info
*vi
, struct sk_buff
*skb
)
450 struct scatterlist sg
[2+MAX_SKB_FRAGS
];
451 struct virtio_net_hdr_mrg_rxbuf
*mhdr
= skb_vnet_hdr(skb
);
452 struct virtio_net_hdr
*hdr
= skb_vnet_hdr(skb
);
453 const unsigned char *dest
= ((struct ethhdr
*)skb
->data
)->h_dest
;
455 sg_init_table(sg
, 2+MAX_SKB_FRAGS
);
457 pr_debug("%s: xmit %p %pM\n", vi
->dev
->name
, skb
, dest
);
459 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
460 hdr
->flags
= VIRTIO_NET_HDR_F_NEEDS_CSUM
;
461 hdr
->csum_start
= skb
->csum_start
- skb_headroom(skb
);
462 hdr
->csum_offset
= skb
->csum_offset
;
465 hdr
->csum_offset
= hdr
->csum_start
= 0;
468 if (skb_is_gso(skb
)) {
469 hdr
->hdr_len
= skb_transport_header(skb
) - skb
->data
;
470 hdr
->gso_size
= skb_shinfo(skb
)->gso_size
;
471 if (skb_shinfo(skb
)->gso_type
& SKB_GSO_TCPV4
)
472 hdr
->gso_type
= VIRTIO_NET_HDR_GSO_TCPV4
;
473 else if (skb_shinfo(skb
)->gso_type
& SKB_GSO_TCPV6
)
474 hdr
->gso_type
= VIRTIO_NET_HDR_GSO_TCPV6
;
475 else if (skb_shinfo(skb
)->gso_type
& SKB_GSO_UDP
)
476 hdr
->gso_type
= VIRTIO_NET_HDR_GSO_UDP
;
479 if (skb_shinfo(skb
)->gso_type
& SKB_GSO_TCP_ECN
)
480 hdr
->gso_type
|= VIRTIO_NET_HDR_GSO_ECN
;
482 hdr
->gso_type
= VIRTIO_NET_HDR_GSO_NONE
;
483 hdr
->gso_size
= hdr
->hdr_len
= 0;
486 mhdr
->num_buffers
= 0;
488 /* Encode metadata header at front. */
489 if (vi
->mergeable_rx_bufs
)
490 sg_init_one(sg
, mhdr
, sizeof(*mhdr
));
492 sg_init_one(sg
, hdr
, sizeof(*hdr
));
494 num
= skb_to_sgvec(skb
, sg
+1, 0, skb
->len
) + 1;
496 err
= vi
->svq
->vq_ops
->add_buf(vi
->svq
, sg
, num
, 0, skb
);
497 if (!err
&& !vi
->free_in_tasklet
)
498 mod_timer(&vi
->xmit_free_timer
, jiffies
+ (HZ
/10));
503 static void xmit_tasklet(unsigned long data
)
505 struct virtnet_info
*vi
= (void *)data
;
507 netif_tx_lock_bh(vi
->dev
);
508 if (vi
->last_xmit_skb
&& xmit_skb(vi
, vi
->last_xmit_skb
) == 0) {
509 vi
->svq
->vq_ops
->kick(vi
->svq
);
510 vi
->last_xmit_skb
= NULL
;
512 if (vi
->free_in_tasklet
)
513 free_old_xmit_skbs(vi
);
514 netif_tx_unlock_bh(vi
->dev
);
517 static int start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
519 struct virtnet_info
*vi
= netdev_priv(dev
);
522 /* Free up any pending old buffers before queueing new ones. */
523 free_old_xmit_skbs(vi
);
525 /* If we has a buffer left over from last time, send it now. */
526 if (unlikely(vi
->last_xmit_skb
) &&
527 xmit_skb(vi
, vi
->last_xmit_skb
) != 0)
530 vi
->last_xmit_skb
= NULL
;
532 /* Put new one in send queue and do transmit */
534 __skb_queue_head(&vi
->send
, skb
);
535 if (xmit_skb(vi
, skb
) != 0) {
536 vi
->last_xmit_skb
= skb
;
542 vi
->svq
->vq_ops
->kick(vi
->svq
);
546 pr_debug("%s: virtio not prepared to send\n", dev
->name
);
547 netif_stop_queue(dev
);
549 /* Activate callback for using skbs: if this returns false it
550 * means some were used in the meantime. */
551 if (unlikely(!vi
->svq
->vq_ops
->enable_cb(vi
->svq
))) {
552 vi
->svq
->vq_ops
->disable_cb(vi
->svq
);
553 netif_start_queue(dev
);
557 /* Drop this skb: we only queue one. */
558 vi
->dev
->stats
.tx_dropped
++;
564 #ifdef CONFIG_NET_POLL_CONTROLLER
565 static void virtnet_netpoll(struct net_device
*dev
)
567 struct virtnet_info
*vi
= netdev_priv(dev
);
569 napi_schedule(&vi
->napi
);
573 static int virtnet_open(struct net_device
*dev
)
575 struct virtnet_info
*vi
= netdev_priv(dev
);
577 napi_enable(&vi
->napi
);
579 /* If all buffers were filled by other side before we napi_enabled, we
580 * won't get another interrupt, so process any outstanding packets
581 * now. virtnet_poll wants re-enable the queue, so we disable here.
582 * We synchronize against interrupts via NAPI_STATE_SCHED */
583 if (napi_schedule_prep(&vi
->napi
)) {
584 vi
->rvq
->vq_ops
->disable_cb(vi
->rvq
);
585 __napi_schedule(&vi
->napi
);
590 static int virtnet_close(struct net_device
*dev
)
592 struct virtnet_info
*vi
= netdev_priv(dev
);
594 napi_disable(&vi
->napi
);
599 static int virtnet_set_tx_csum(struct net_device
*dev
, u32 data
)
601 struct virtnet_info
*vi
= netdev_priv(dev
);
602 struct virtio_device
*vdev
= vi
->vdev
;
604 if (data
&& !virtio_has_feature(vdev
, VIRTIO_NET_F_CSUM
))
607 return ethtool_op_set_tx_hw_csum(dev
, data
);
610 static struct ethtool_ops virtnet_ethtool_ops
= {
611 .set_tx_csum
= virtnet_set_tx_csum
,
612 .set_sg
= ethtool_op_set_sg
,
613 .set_tso
= ethtool_op_set_tso
,
617 #define MAX_MTU 65535
619 static int virtnet_change_mtu(struct net_device
*dev
, int new_mtu
)
621 if (new_mtu
< MIN_MTU
|| new_mtu
> MAX_MTU
)
627 static const struct net_device_ops virtnet_netdev
= {
628 .ndo_open
= virtnet_open
,
629 .ndo_stop
= virtnet_close
,
630 .ndo_start_xmit
= start_xmit
,
631 .ndo_validate_addr
= eth_validate_addr
,
632 .ndo_set_mac_address
= eth_mac_addr
,
633 .ndo_change_mtu
= virtnet_change_mtu
,
634 #ifdef CONFIG_NET_POLL_CONTROLLER
635 .ndo_poll_controller
= virtnet_netpoll
,
639 static int virtnet_probe(struct virtio_device
*vdev
)
642 struct net_device
*dev
;
643 struct virtnet_info
*vi
;
645 /* Allocate ourselves a network device with room for our info */
646 dev
= alloc_etherdev(sizeof(struct virtnet_info
));
650 /* Set up network device as normal. */
651 dev
->netdev_ops
= &virtnet_netdev
;
652 dev
->features
= NETIF_F_HIGHDMA
;
653 SET_ETHTOOL_OPS(dev
, &virtnet_ethtool_ops
);
654 SET_NETDEV_DEV(dev
, &vdev
->dev
);
656 /* Do we support "hardware" checksums? */
657 if (csum
&& virtio_has_feature(vdev
, VIRTIO_NET_F_CSUM
)) {
658 /* This opens up the world of extra features. */
659 dev
->features
|= NETIF_F_HW_CSUM
|NETIF_F_SG
|NETIF_F_FRAGLIST
;
660 if (gso
&& virtio_has_feature(vdev
, VIRTIO_NET_F_GSO
)) {
661 dev
->features
|= NETIF_F_TSO
| NETIF_F_UFO
662 | NETIF_F_TSO_ECN
| NETIF_F_TSO6
;
664 /* Individual feature bits: what can host handle? */
665 if (gso
&& virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_TSO4
))
666 dev
->features
|= NETIF_F_TSO
;
667 if (gso
&& virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_TSO6
))
668 dev
->features
|= NETIF_F_TSO6
;
669 if (gso
&& virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_ECN
))
670 dev
->features
|= NETIF_F_TSO_ECN
;
671 if (gso
&& virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_UFO
))
672 dev
->features
|= NETIF_F_UFO
;
675 /* Configuration may specify what MAC to use. Otherwise random. */
676 if (virtio_has_feature(vdev
, VIRTIO_NET_F_MAC
)) {
677 vdev
->config
->get(vdev
,
678 offsetof(struct virtio_net_config
, mac
),
679 dev
->dev_addr
, dev
->addr_len
);
681 random_ether_addr(dev
->dev_addr
);
683 /* Set up our device-specific information */
684 vi
= netdev_priv(dev
);
685 netif_napi_add(dev
, &vi
->napi
, virtnet_poll
, napi_weight
);
691 /* If they give us a callback when all buffers are done, we don't need
693 vi
->free_in_tasklet
= virtio_has_feature(vdev
,VIRTIO_F_NOTIFY_ON_EMPTY
);
695 /* If we can receive ANY GSO packets, we must allocate large ones. */
696 if (virtio_has_feature(vdev
, VIRTIO_NET_F_GUEST_TSO4
)
697 || virtio_has_feature(vdev
, VIRTIO_NET_F_GUEST_TSO6
)
698 || virtio_has_feature(vdev
, VIRTIO_NET_F_GUEST_ECN
))
699 vi
->big_packets
= true;
701 if (virtio_has_feature(vdev
, VIRTIO_NET_F_MRG_RXBUF
))
702 vi
->mergeable_rx_bufs
= true;
704 /* We expect two virtqueues, receive then send. */
705 vi
->rvq
= vdev
->config
->find_vq(vdev
, 0, skb_recv_done
);
706 if (IS_ERR(vi
->rvq
)) {
707 err
= PTR_ERR(vi
->rvq
);
711 vi
->svq
= vdev
->config
->find_vq(vdev
, 1, skb_xmit_done
);
712 if (IS_ERR(vi
->svq
)) {
713 err
= PTR_ERR(vi
->svq
);
717 /* Initialize our empty receive and send queues. */
718 skb_queue_head_init(&vi
->recv
);
719 skb_queue_head_init(&vi
->send
);
721 tasklet_init(&vi
->tasklet
, xmit_tasklet
, (unsigned long)vi
);
723 if (!vi
->free_in_tasklet
)
724 setup_timer(&vi
->xmit_free_timer
, xmit_free
, (unsigned long)vi
);
726 err
= register_netdev(dev
);
728 pr_debug("virtio_net: registering device failed\n");
732 /* Last of all, set up some receive buffers. */
735 /* If we didn't even get one input buffer, we're useless. */
741 pr_debug("virtnet: registered device %s\n", dev
->name
);
745 unregister_netdev(dev
);
747 vdev
->config
->del_vq(vi
->svq
);
749 vdev
->config
->del_vq(vi
->rvq
);
755 static void virtnet_remove(struct virtio_device
*vdev
)
757 struct virtnet_info
*vi
= vdev
->priv
;
760 /* Stop all the virtqueues. */
761 vdev
->config
->reset(vdev
);
763 if (!vi
->free_in_tasklet
)
764 del_timer_sync(&vi
->xmit_free_timer
);
766 /* Free our skbs in send and recv queues, if any. */
767 while ((skb
= __skb_dequeue(&vi
->recv
)) != NULL
) {
771 __skb_queue_purge(&vi
->send
);
773 BUG_ON(vi
->num
!= 0);
775 vdev
->config
->del_vq(vi
->svq
);
776 vdev
->config
->del_vq(vi
->rvq
);
777 unregister_netdev(vi
->dev
);
780 __free_pages(get_a_page(vi
, GFP_KERNEL
), 0);
782 free_netdev(vi
->dev
);
785 static struct virtio_device_id id_table
[] = {
786 { VIRTIO_ID_NET
, VIRTIO_DEV_ANY_ID
},
790 static unsigned int features
[] = {
791 VIRTIO_NET_F_CSUM
, VIRTIO_NET_F_GUEST_CSUM
,
792 VIRTIO_NET_F_GSO
, VIRTIO_NET_F_MAC
,
793 VIRTIO_NET_F_HOST_TSO4
, VIRTIO_NET_F_HOST_UFO
, VIRTIO_NET_F_HOST_TSO6
,
794 VIRTIO_NET_F_HOST_ECN
, VIRTIO_NET_F_GUEST_TSO4
, VIRTIO_NET_F_GUEST_TSO6
,
795 VIRTIO_NET_F_GUEST_ECN
, /* We don't yet handle UFO input. */
796 VIRTIO_NET_F_MRG_RXBUF
,
797 VIRTIO_F_NOTIFY_ON_EMPTY
,
800 static struct virtio_driver virtio_net
= {
801 .feature_table
= features
,
802 .feature_table_size
= ARRAY_SIZE(features
),
803 .driver
.name
= KBUILD_MODNAME
,
804 .driver
.owner
= THIS_MODULE
,
805 .id_table
= id_table
,
806 .probe
= virtnet_probe
,
807 .remove
= __devexit_p(virtnet_remove
),
810 static int __init
init(void)
812 return register_virtio_driver(&virtio_net
);
815 static void __exit
fini(void)
817 unregister_virtio_driver(&virtio_net
);
822 MODULE_DEVICE_TABLE(virtio
, id_table
);
823 MODULE_DESCRIPTION("Virtio network driver");
824 MODULE_LICENSE("GPL");