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>
27 #include <linux/if_vlan.h>
29 static int napi_weight
= 128;
30 module_param(napi_weight
, int, 0444);
32 static int csum
= 1, gso
= 1;
33 module_param(csum
, bool, 0444);
34 module_param(gso
, bool, 0444);
36 /* FIXME: MTU in config. */
37 #define MAX_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN)
38 #define GOOD_COPY_LEN 128
40 #define VIRTNET_SEND_COMMAND_SG_MAX 2
44 struct virtio_device
*vdev
;
45 struct virtqueue
*rvq
, *svq
, *cvq
;
46 struct net_device
*dev
;
47 struct napi_struct napi
;
50 /* The skb we couldn't send because buffers were full. */
51 struct sk_buff
*last_xmit_skb
;
53 /* If we need to free in a timer, this is it. */
54 struct timer_list xmit_free_timer
;
56 /* Number of input buffers, and max we've ever had. */
57 unsigned int num
, max
;
59 /* For cleaning up after transmission. */
60 struct tasklet_struct tasklet
;
63 /* I like... big packets and I cannot lie! */
66 /* Host will merge rx buffers for big packets (shake it! shake it!) */
67 bool mergeable_rx_bufs
;
69 /* Receive & send queues. */
70 struct sk_buff_head recv
;
71 struct sk_buff_head send
;
73 /* Work struct for refilling if we run low on memory. */
74 struct delayed_work refill
;
76 /* Chain pages by the private ptr. */
80 static inline void *skb_vnet_hdr(struct sk_buff
*skb
)
82 return (struct virtio_net_hdr
*)skb
->cb
;
85 static void give_a_page(struct virtnet_info
*vi
, struct page
*page
)
87 page
->private = (unsigned long)vi
->pages
;
91 static void trim_pages(struct virtnet_info
*vi
, struct sk_buff
*skb
)
95 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++)
96 give_a_page(vi
, skb_shinfo(skb
)->frags
[i
].page
);
97 skb_shinfo(skb
)->nr_frags
= 0;
101 static struct page
*get_a_page(struct virtnet_info
*vi
, gfp_t gfp_mask
)
103 struct page
*p
= vi
->pages
;
106 vi
->pages
= (struct page
*)p
->private;
108 p
= alloc_page(gfp_mask
);
112 static void skb_xmit_done(struct virtqueue
*svq
)
114 struct virtnet_info
*vi
= svq
->vdev
->priv
;
116 /* Suppress further interrupts. */
117 svq
->vq_ops
->disable_cb(svq
);
119 /* We were probably waiting for more output buffers. */
120 netif_wake_queue(vi
->dev
);
122 /* Make sure we re-xmit last_xmit_skb: if there are no more packets
123 * queued, start_xmit won't be called. */
124 tasklet_schedule(&vi
->tasklet
);
127 static void receive_skb(struct net_device
*dev
, struct sk_buff
*skb
,
130 struct virtnet_info
*vi
= netdev_priv(dev
);
131 struct virtio_net_hdr
*hdr
= skb_vnet_hdr(skb
);
135 if (unlikely(len
< sizeof(struct virtio_net_hdr
) + ETH_HLEN
)) {
136 pr_debug("%s: short packet %i\n", dev
->name
, len
);
137 dev
->stats
.rx_length_errors
++;
141 if (vi
->mergeable_rx_bufs
) {
142 struct virtio_net_hdr_mrg_rxbuf
*mhdr
= skb_vnet_hdr(skb
);
144 char *p
= page_address(skb_shinfo(skb
)->frags
[0].page
);
148 len
-= sizeof(struct virtio_net_hdr_mrg_rxbuf
);
150 memcpy(hdr
, p
, sizeof(*mhdr
));
154 if (copy
> skb_tailroom(skb
))
155 copy
= skb_tailroom(skb
);
157 memcpy(skb_put(skb
, copy
), p
, copy
);
162 give_a_page(vi
, skb_shinfo(skb
)->frags
[0].page
);
163 skb_shinfo(skb
)->nr_frags
--;
165 skb_shinfo(skb
)->frags
[0].page_offset
+=
166 sizeof(*mhdr
) + copy
;
167 skb_shinfo(skb
)->frags
[0].size
= len
;
168 skb
->data_len
+= len
;
172 while (--mhdr
->num_buffers
) {
173 struct sk_buff
*nskb
;
175 i
= skb_shinfo(skb
)->nr_frags
;
176 if (i
>= MAX_SKB_FRAGS
) {
177 pr_debug("%s: packet too long %d\n", dev
->name
,
179 dev
->stats
.rx_length_errors
++;
183 nskb
= vi
->rvq
->vq_ops
->get_buf(vi
->rvq
, &len
);
185 pr_debug("%s: rx error: %d buffers missing\n",
186 dev
->name
, mhdr
->num_buffers
);
187 dev
->stats
.rx_length_errors
++;
191 __skb_unlink(nskb
, &vi
->recv
);
194 skb_shinfo(skb
)->frags
[i
] = skb_shinfo(nskb
)->frags
[0];
195 skb_shinfo(nskb
)->nr_frags
= 0;
201 skb_shinfo(skb
)->frags
[i
].size
= len
;
202 skb_shinfo(skb
)->nr_frags
++;
203 skb
->data_len
+= len
;
207 len
-= sizeof(struct virtio_net_hdr
);
209 if (len
<= MAX_PACKET_LEN
)
212 err
= pskb_trim(skb
, len
);
214 pr_debug("%s: pskb_trim failed %i %d\n", dev
->name
,
216 dev
->stats
.rx_dropped
++;
221 skb
->truesize
+= skb
->data_len
;
222 dev
->stats
.rx_bytes
+= skb
->len
;
223 dev
->stats
.rx_packets
++;
225 if (hdr
->flags
& VIRTIO_NET_HDR_F_NEEDS_CSUM
) {
226 pr_debug("Needs csum!\n");
227 if (!skb_partial_csum_set(skb
,hdr
->csum_start
,hdr
->csum_offset
))
231 skb
->protocol
= eth_type_trans(skb
, dev
);
232 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
233 ntohs(skb
->protocol
), skb
->len
, skb
->pkt_type
);
235 if (hdr
->gso_type
!= VIRTIO_NET_HDR_GSO_NONE
) {
237 switch (hdr
->gso_type
& ~VIRTIO_NET_HDR_GSO_ECN
) {
238 case VIRTIO_NET_HDR_GSO_TCPV4
:
239 skb_shinfo(skb
)->gso_type
= SKB_GSO_TCPV4
;
241 case VIRTIO_NET_HDR_GSO_UDP
:
242 skb_shinfo(skb
)->gso_type
= SKB_GSO_UDP
;
244 case VIRTIO_NET_HDR_GSO_TCPV6
:
245 skb_shinfo(skb
)->gso_type
= SKB_GSO_TCPV6
;
249 printk(KERN_WARNING
"%s: bad gso type %u.\n",
250 dev
->name
, hdr
->gso_type
);
254 if (hdr
->gso_type
& VIRTIO_NET_HDR_GSO_ECN
)
255 skb_shinfo(skb
)->gso_type
|= SKB_GSO_TCP_ECN
;
257 skb_shinfo(skb
)->gso_size
= hdr
->gso_size
;
258 if (skb_shinfo(skb
)->gso_size
== 0) {
260 printk(KERN_WARNING
"%s: zero gso size.\n",
265 /* Header must be checked, and gso_segs computed. */
266 skb_shinfo(skb
)->gso_type
|= SKB_GSO_DODGY
;
267 skb_shinfo(skb
)->gso_segs
= 0;
270 netif_receive_skb(skb
);
274 dev
->stats
.rx_frame_errors
++;
279 static bool try_fill_recv_maxbufs(struct virtnet_info
*vi
, gfp_t gfp
)
282 struct scatterlist sg
[2+MAX_SKB_FRAGS
];
286 sg_init_table(sg
, 2+MAX_SKB_FRAGS
);
288 struct virtio_net_hdr
*hdr
;
290 skb
= netdev_alloc_skb(vi
->dev
, MAX_PACKET_LEN
+ NET_IP_ALIGN
);
291 if (unlikely(!skb
)) {
296 skb_reserve(skb
, NET_IP_ALIGN
);
297 skb_put(skb
, MAX_PACKET_LEN
);
299 hdr
= skb_vnet_hdr(skb
);
300 sg_set_buf(sg
, hdr
, sizeof(*hdr
));
302 if (vi
->big_packets
) {
303 for (i
= 0; i
< MAX_SKB_FRAGS
; i
++) {
304 skb_frag_t
*f
= &skb_shinfo(skb
)->frags
[i
];
305 f
->page
= get_a_page(vi
, gfp
);
312 skb
->data_len
+= PAGE_SIZE
;
313 skb
->len
+= PAGE_SIZE
;
315 skb_shinfo(skb
)->nr_frags
++;
319 num
= skb_to_sgvec(skb
, sg
+1, 0, skb
->len
) + 1;
320 skb_queue_head(&vi
->recv
, skb
);
322 err
= vi
->rvq
->vq_ops
->add_buf(vi
->rvq
, sg
, 0, num
, skb
);
324 skb_unlink(skb
, &vi
->recv
);
331 if (unlikely(vi
->num
> vi
->max
))
333 vi
->rvq
->vq_ops
->kick(vi
->rvq
);
337 /* Returns false if we couldn't fill entirely (OOM). */
338 static bool try_fill_recv(struct virtnet_info
*vi
, gfp_t gfp
)
341 struct scatterlist sg
[1];
345 if (!vi
->mergeable_rx_bufs
)
346 return try_fill_recv_maxbufs(vi
, gfp
);
351 skb
= netdev_alloc_skb(vi
->dev
, GOOD_COPY_LEN
+ NET_IP_ALIGN
);
352 if (unlikely(!skb
)) {
357 skb_reserve(skb
, NET_IP_ALIGN
);
359 f
= &skb_shinfo(skb
)->frags
[0];
360 f
->page
= get_a_page(vi
, gfp
);
370 skb_shinfo(skb
)->nr_frags
++;
372 sg_init_one(sg
, page_address(f
->page
), PAGE_SIZE
);
373 skb_queue_head(&vi
->recv
, skb
);
375 err
= vi
->rvq
->vq_ops
->add_buf(vi
->rvq
, sg
, 0, 1, skb
);
377 skb_unlink(skb
, &vi
->recv
);
383 if (unlikely(vi
->num
> vi
->max
))
385 vi
->rvq
->vq_ops
->kick(vi
->rvq
);
389 static void skb_recv_done(struct virtqueue
*rvq
)
391 struct virtnet_info
*vi
= rvq
->vdev
->priv
;
392 /* Schedule NAPI, Suppress further interrupts if successful. */
393 if (napi_schedule_prep(&vi
->napi
)) {
394 rvq
->vq_ops
->disable_cb(rvq
);
395 __napi_schedule(&vi
->napi
);
399 static void refill_work(struct work_struct
*work
)
401 struct virtnet_info
*vi
;
404 vi
= container_of(work
, struct virtnet_info
, refill
.work
);
405 napi_disable(&vi
->napi
);
406 try_fill_recv(vi
, GFP_KERNEL
);
407 still_empty
= (vi
->num
== 0);
408 napi_enable(&vi
->napi
);
410 /* In theory, this can happen: if we don't get any buffers in
411 * we will *never* try to fill again. */
413 schedule_delayed_work(&vi
->refill
, HZ
/2);
416 static int virtnet_poll(struct napi_struct
*napi
, int budget
)
418 struct virtnet_info
*vi
= container_of(napi
, struct virtnet_info
, napi
);
419 struct sk_buff
*skb
= NULL
;
420 unsigned int len
, received
= 0;
423 while (received
< budget
&&
424 (skb
= vi
->rvq
->vq_ops
->get_buf(vi
->rvq
, &len
)) != NULL
) {
425 __skb_unlink(skb
, &vi
->recv
);
426 receive_skb(vi
->dev
, skb
, len
);
431 if (vi
->num
< vi
->max
/ 2) {
432 if (!try_fill_recv(vi
, GFP_ATOMIC
))
433 schedule_delayed_work(&vi
->refill
, 0);
436 /* Out of packets? */
437 if (received
< budget
) {
439 if (unlikely(!vi
->rvq
->vq_ops
->enable_cb(vi
->rvq
))
440 && napi_schedule_prep(napi
)) {
441 vi
->rvq
->vq_ops
->disable_cb(vi
->rvq
);
442 __napi_schedule(napi
);
450 static void free_old_xmit_skbs(struct virtnet_info
*vi
)
455 while ((skb
= vi
->svq
->vq_ops
->get_buf(vi
->svq
, &len
)) != NULL
) {
456 pr_debug("Sent skb %p\n", skb
);
457 __skb_unlink(skb
, &vi
->send
);
458 vi
->dev
->stats
.tx_bytes
+= skb
->len
;
459 vi
->dev
->stats
.tx_packets
++;
464 /* If the virtio transport doesn't always notify us when all in-flight packets
465 * are consumed, we fall back to using this function on a timer to free them. */
466 static void xmit_free(unsigned long data
)
468 struct virtnet_info
*vi
= (void *)data
;
470 netif_tx_lock(vi
->dev
);
472 free_old_xmit_skbs(vi
);
474 if (!skb_queue_empty(&vi
->send
))
475 mod_timer(&vi
->xmit_free_timer
, jiffies
+ (HZ
/10));
477 netif_tx_unlock(vi
->dev
);
480 static int xmit_skb(struct virtnet_info
*vi
, struct sk_buff
*skb
)
483 struct scatterlist sg
[2+MAX_SKB_FRAGS
];
484 struct virtio_net_hdr_mrg_rxbuf
*mhdr
= skb_vnet_hdr(skb
);
485 struct virtio_net_hdr
*hdr
= skb_vnet_hdr(skb
);
486 const unsigned char *dest
= ((struct ethhdr
*)skb
->data
)->h_dest
;
488 sg_init_table(sg
, 2+MAX_SKB_FRAGS
);
490 pr_debug("%s: xmit %p %pM\n", vi
->dev
->name
, skb
, dest
);
492 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
493 hdr
->flags
= VIRTIO_NET_HDR_F_NEEDS_CSUM
;
494 hdr
->csum_start
= skb
->csum_start
- skb_headroom(skb
);
495 hdr
->csum_offset
= skb
->csum_offset
;
498 hdr
->csum_offset
= hdr
->csum_start
= 0;
501 if (skb_is_gso(skb
)) {
502 hdr
->hdr_len
= skb_headlen(skb
);
503 hdr
->gso_size
= skb_shinfo(skb
)->gso_size
;
504 if (skb_shinfo(skb
)->gso_type
& SKB_GSO_TCPV4
)
505 hdr
->gso_type
= VIRTIO_NET_HDR_GSO_TCPV4
;
506 else if (skb_shinfo(skb
)->gso_type
& SKB_GSO_TCPV6
)
507 hdr
->gso_type
= VIRTIO_NET_HDR_GSO_TCPV6
;
508 else if (skb_shinfo(skb
)->gso_type
& SKB_GSO_UDP
)
509 hdr
->gso_type
= VIRTIO_NET_HDR_GSO_UDP
;
512 if (skb_shinfo(skb
)->gso_type
& SKB_GSO_TCP_ECN
)
513 hdr
->gso_type
|= VIRTIO_NET_HDR_GSO_ECN
;
515 hdr
->gso_type
= VIRTIO_NET_HDR_GSO_NONE
;
516 hdr
->gso_size
= hdr
->hdr_len
= 0;
519 mhdr
->num_buffers
= 0;
521 /* Encode metadata header at front. */
522 if (vi
->mergeable_rx_bufs
)
523 sg_set_buf(sg
, mhdr
, sizeof(*mhdr
));
525 sg_set_buf(sg
, hdr
, sizeof(*hdr
));
527 num
= skb_to_sgvec(skb
, sg
+1, 0, skb
->len
) + 1;
529 err
= vi
->svq
->vq_ops
->add_buf(vi
->svq
, sg
, num
, 0, skb
);
530 if (!err
&& !vi
->free_in_tasklet
)
531 mod_timer(&vi
->xmit_free_timer
, jiffies
+ (HZ
/10));
536 static void xmit_tasklet(unsigned long data
)
538 struct virtnet_info
*vi
= (void *)data
;
540 netif_tx_lock_bh(vi
->dev
);
541 if (vi
->last_xmit_skb
&& xmit_skb(vi
, vi
->last_xmit_skb
) == 0) {
542 vi
->svq
->vq_ops
->kick(vi
->svq
);
543 vi
->last_xmit_skb
= NULL
;
545 if (vi
->free_in_tasklet
)
546 free_old_xmit_skbs(vi
);
547 netif_tx_unlock_bh(vi
->dev
);
550 static netdev_tx_t
start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
552 struct virtnet_info
*vi
= netdev_priv(dev
);
555 /* Free up any pending old buffers before queueing new ones. */
556 free_old_xmit_skbs(vi
);
558 /* If we has a buffer left over from last time, send it now. */
559 if (unlikely(vi
->last_xmit_skb
) &&
560 xmit_skb(vi
, vi
->last_xmit_skb
) != 0)
563 vi
->last_xmit_skb
= NULL
;
565 /* Put new one in send queue and do transmit */
567 __skb_queue_head(&vi
->send
, skb
);
568 if (xmit_skb(vi
, skb
) != 0) {
569 vi
->last_xmit_skb
= skb
;
575 vi
->svq
->vq_ops
->kick(vi
->svq
);
579 pr_debug("%s: virtio not prepared to send\n", dev
->name
);
580 netif_stop_queue(dev
);
582 /* Activate callback for using skbs: if this returns false it
583 * means some were used in the meantime. */
584 if (unlikely(!vi
->svq
->vq_ops
->enable_cb(vi
->svq
))) {
585 vi
->svq
->vq_ops
->disable_cb(vi
->svq
);
586 netif_start_queue(dev
);
590 /* Drop this skb: we only queue one. */
591 vi
->dev
->stats
.tx_dropped
++;
597 static int virtnet_set_mac_address(struct net_device
*dev
, void *p
)
599 struct virtnet_info
*vi
= netdev_priv(dev
);
600 struct virtio_device
*vdev
= vi
->vdev
;
603 ret
= eth_mac_addr(dev
, p
);
607 if (virtio_has_feature(vdev
, VIRTIO_NET_F_MAC
))
608 vdev
->config
->set(vdev
, offsetof(struct virtio_net_config
, mac
),
609 dev
->dev_addr
, dev
->addr_len
);
614 #ifdef CONFIG_NET_POLL_CONTROLLER
615 static void virtnet_netpoll(struct net_device
*dev
)
617 struct virtnet_info
*vi
= netdev_priv(dev
);
619 napi_schedule(&vi
->napi
);
623 static int virtnet_open(struct net_device
*dev
)
625 struct virtnet_info
*vi
= netdev_priv(dev
);
627 napi_enable(&vi
->napi
);
629 /* If all buffers were filled by other side before we napi_enabled, we
630 * won't get another interrupt, so process any outstanding packets
631 * now. virtnet_poll wants re-enable the queue, so we disable here.
632 * We synchronize against interrupts via NAPI_STATE_SCHED */
633 if (napi_schedule_prep(&vi
->napi
)) {
634 vi
->rvq
->vq_ops
->disable_cb(vi
->rvq
);
635 __napi_schedule(&vi
->napi
);
641 * Send command via the control virtqueue and check status. Commands
642 * supported by the hypervisor, as indicated by feature bits, should
643 * never fail unless improperly formated.
645 static bool virtnet_send_command(struct virtnet_info
*vi
, u8
class, u8 cmd
,
646 struct scatterlist
*data
, int out
, int in
)
648 struct scatterlist
*s
, sg
[VIRTNET_SEND_COMMAND_SG_MAX
+ 2];
649 struct virtio_net_ctrl_hdr ctrl
;
650 virtio_net_ctrl_ack status
= ~0;
654 /* Caller should know better */
655 BUG_ON(!virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_VQ
) ||
656 (out
+ in
> VIRTNET_SEND_COMMAND_SG_MAX
));
658 out
++; /* Add header */
659 in
++; /* Add return status */
664 sg_init_table(sg
, out
+ in
);
666 sg_set_buf(&sg
[0], &ctrl
, sizeof(ctrl
));
667 for_each_sg(data
, s
, out
+ in
- 2, i
)
668 sg_set_buf(&sg
[i
+ 1], sg_virt(s
), s
->length
);
669 sg_set_buf(&sg
[out
+ in
- 1], &status
, sizeof(status
));
671 BUG_ON(vi
->cvq
->vq_ops
->add_buf(vi
->cvq
, sg
, out
, in
, vi
));
673 vi
->cvq
->vq_ops
->kick(vi
->cvq
);
676 * Spin for a response, the kick causes an ioport write, trapping
677 * into the hypervisor, so the request should be handled immediately.
679 while (!vi
->cvq
->vq_ops
->get_buf(vi
->cvq
, &tmp
))
682 return status
== VIRTIO_NET_OK
;
685 static int virtnet_close(struct net_device
*dev
)
687 struct virtnet_info
*vi
= netdev_priv(dev
);
689 napi_disable(&vi
->napi
);
694 static int virtnet_set_tx_csum(struct net_device
*dev
, u32 data
)
696 struct virtnet_info
*vi
= netdev_priv(dev
);
697 struct virtio_device
*vdev
= vi
->vdev
;
699 if (data
&& !virtio_has_feature(vdev
, VIRTIO_NET_F_CSUM
))
702 return ethtool_op_set_tx_hw_csum(dev
, data
);
705 static void virtnet_set_rx_mode(struct net_device
*dev
)
707 struct virtnet_info
*vi
= netdev_priv(dev
);
708 struct scatterlist sg
[2];
709 u8 promisc
, allmulti
;
710 struct virtio_net_ctrl_mac
*mac_data
;
711 struct dev_addr_list
*addr
;
712 struct netdev_hw_addr
*ha
;
716 /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */
717 if (!virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_RX
))
720 promisc
= ((dev
->flags
& IFF_PROMISC
) != 0);
721 allmulti
= ((dev
->flags
& IFF_ALLMULTI
) != 0);
723 sg_init_one(sg
, &promisc
, sizeof(promisc
));
725 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_RX
,
726 VIRTIO_NET_CTRL_RX_PROMISC
,
728 dev_warn(&dev
->dev
, "Failed to %sable promisc mode.\n",
729 promisc
? "en" : "dis");
731 sg_init_one(sg
, &allmulti
, sizeof(allmulti
));
733 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_RX
,
734 VIRTIO_NET_CTRL_RX_ALLMULTI
,
736 dev_warn(&dev
->dev
, "Failed to %sable allmulti mode.\n",
737 allmulti
? "en" : "dis");
739 /* MAC filter - use one buffer for both lists */
740 mac_data
= buf
= kzalloc(((dev
->uc
.count
+ dev
->mc_count
) * ETH_ALEN
) +
741 (2 * sizeof(mac_data
->entries
)), GFP_ATOMIC
);
743 dev_warn(&dev
->dev
, "No memory for MAC address buffer\n");
747 sg_init_table(sg
, 2);
749 /* Store the unicast list and count in the front of the buffer */
750 mac_data
->entries
= dev
->uc
.count
;
752 list_for_each_entry(ha
, &dev
->uc
.list
, list
)
753 memcpy(&mac_data
->macs
[i
++][0], ha
->addr
, ETH_ALEN
);
755 sg_set_buf(&sg
[0], mac_data
,
756 sizeof(mac_data
->entries
) + (dev
->uc
.count
* ETH_ALEN
));
758 /* multicast list and count fill the end */
759 mac_data
= (void *)&mac_data
->macs
[dev
->uc
.count
][0];
761 mac_data
->entries
= dev
->mc_count
;
763 for (i
= 0; i
< dev
->mc_count
; i
++, addr
= addr
->next
)
764 memcpy(&mac_data
->macs
[i
][0], addr
->da_addr
, ETH_ALEN
);
766 sg_set_buf(&sg
[1], mac_data
,
767 sizeof(mac_data
->entries
) + (dev
->mc_count
* ETH_ALEN
));
769 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_MAC
,
770 VIRTIO_NET_CTRL_MAC_TABLE_SET
,
772 dev_warn(&dev
->dev
, "Failed to set MAC fitler table.\n");
777 static void virtnet_vlan_rx_add_vid(struct net_device
*dev
, u16 vid
)
779 struct virtnet_info
*vi
= netdev_priv(dev
);
780 struct scatterlist sg
;
782 sg_init_one(&sg
, &vid
, sizeof(vid
));
784 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_VLAN
,
785 VIRTIO_NET_CTRL_VLAN_ADD
, &sg
, 1, 0))
786 dev_warn(&dev
->dev
, "Failed to add VLAN ID %d.\n", vid
);
789 static void virtnet_vlan_rx_kill_vid(struct net_device
*dev
, u16 vid
)
791 struct virtnet_info
*vi
= netdev_priv(dev
);
792 struct scatterlist sg
;
794 sg_init_one(&sg
, &vid
, sizeof(vid
));
796 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_VLAN
,
797 VIRTIO_NET_CTRL_VLAN_DEL
, &sg
, 1, 0))
798 dev_warn(&dev
->dev
, "Failed to kill VLAN ID %d.\n", vid
);
801 static struct ethtool_ops virtnet_ethtool_ops
= {
802 .set_tx_csum
= virtnet_set_tx_csum
,
803 .set_sg
= ethtool_op_set_sg
,
804 .set_tso
= ethtool_op_set_tso
,
805 .set_ufo
= ethtool_op_set_ufo
,
806 .get_link
= ethtool_op_get_link
,
810 #define MAX_MTU 65535
812 static int virtnet_change_mtu(struct net_device
*dev
, int new_mtu
)
814 if (new_mtu
< MIN_MTU
|| new_mtu
> MAX_MTU
)
820 static const struct net_device_ops virtnet_netdev
= {
821 .ndo_open
= virtnet_open
,
822 .ndo_stop
= virtnet_close
,
823 .ndo_start_xmit
= start_xmit
,
824 .ndo_validate_addr
= eth_validate_addr
,
825 .ndo_set_mac_address
= virtnet_set_mac_address
,
826 .ndo_set_rx_mode
= virtnet_set_rx_mode
,
827 .ndo_change_mtu
= virtnet_change_mtu
,
828 .ndo_vlan_rx_add_vid
= virtnet_vlan_rx_add_vid
,
829 .ndo_vlan_rx_kill_vid
= virtnet_vlan_rx_kill_vid
,
830 #ifdef CONFIG_NET_POLL_CONTROLLER
831 .ndo_poll_controller
= virtnet_netpoll
,
835 static void virtnet_update_status(struct virtnet_info
*vi
)
839 if (!virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_STATUS
))
842 vi
->vdev
->config
->get(vi
->vdev
,
843 offsetof(struct virtio_net_config
, status
),
846 /* Ignore unknown (future) status bits */
847 v
&= VIRTIO_NET_S_LINK_UP
;
854 if (vi
->status
& VIRTIO_NET_S_LINK_UP
) {
855 netif_carrier_on(vi
->dev
);
856 netif_wake_queue(vi
->dev
);
858 netif_carrier_off(vi
->dev
);
859 netif_stop_queue(vi
->dev
);
863 static void virtnet_config_changed(struct virtio_device
*vdev
)
865 struct virtnet_info
*vi
= vdev
->priv
;
867 virtnet_update_status(vi
);
870 static int virtnet_probe(struct virtio_device
*vdev
)
873 struct net_device
*dev
;
874 struct virtnet_info
*vi
;
875 struct virtqueue
*vqs
[3];
876 vq_callback_t
*callbacks
[] = { skb_recv_done
, skb_xmit_done
, NULL
};
877 const char *names
[] = { "input", "output", "control" };
880 /* Allocate ourselves a network device with room for our info */
881 dev
= alloc_etherdev(sizeof(struct virtnet_info
));
885 /* Set up network device as normal. */
886 dev
->netdev_ops
= &virtnet_netdev
;
887 dev
->features
= NETIF_F_HIGHDMA
;
888 SET_ETHTOOL_OPS(dev
, &virtnet_ethtool_ops
);
889 SET_NETDEV_DEV(dev
, &vdev
->dev
);
891 /* Do we support "hardware" checksums? */
892 if (csum
&& virtio_has_feature(vdev
, VIRTIO_NET_F_CSUM
)) {
893 /* This opens up the world of extra features. */
894 dev
->features
|= NETIF_F_HW_CSUM
|NETIF_F_SG
|NETIF_F_FRAGLIST
;
895 if (gso
&& virtio_has_feature(vdev
, VIRTIO_NET_F_GSO
)) {
896 dev
->features
|= NETIF_F_TSO
| NETIF_F_UFO
897 | NETIF_F_TSO_ECN
| NETIF_F_TSO6
;
899 /* Individual feature bits: what can host handle? */
900 if (gso
&& virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_TSO4
))
901 dev
->features
|= NETIF_F_TSO
;
902 if (gso
&& virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_TSO6
))
903 dev
->features
|= NETIF_F_TSO6
;
904 if (gso
&& virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_ECN
))
905 dev
->features
|= NETIF_F_TSO_ECN
;
906 if (gso
&& virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_UFO
))
907 dev
->features
|= NETIF_F_UFO
;
910 /* Configuration may specify what MAC to use. Otherwise random. */
911 if (virtio_has_feature(vdev
, VIRTIO_NET_F_MAC
)) {
912 vdev
->config
->get(vdev
,
913 offsetof(struct virtio_net_config
, mac
),
914 dev
->dev_addr
, dev
->addr_len
);
916 random_ether_addr(dev
->dev_addr
);
918 /* Set up our device-specific information */
919 vi
= netdev_priv(dev
);
920 netif_napi_add(dev
, &vi
->napi
, virtnet_poll
, napi_weight
);
925 INIT_DELAYED_WORK(&vi
->refill
, refill_work
);
927 /* If they give us a callback when all buffers are done, we don't need
929 vi
->free_in_tasklet
= virtio_has_feature(vdev
,VIRTIO_F_NOTIFY_ON_EMPTY
);
931 /* If we can receive ANY GSO packets, we must allocate large ones. */
932 if (virtio_has_feature(vdev
, VIRTIO_NET_F_GUEST_TSO4
)
933 || virtio_has_feature(vdev
, VIRTIO_NET_F_GUEST_TSO6
)
934 || virtio_has_feature(vdev
, VIRTIO_NET_F_GUEST_ECN
))
935 vi
->big_packets
= true;
937 if (virtio_has_feature(vdev
, VIRTIO_NET_F_MRG_RXBUF
))
938 vi
->mergeable_rx_bufs
= true;
940 /* We expect two virtqueues, receive then send,
941 * and optionally control. */
942 nvqs
= virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_VQ
) ? 3 : 2;
944 err
= vdev
->config
->find_vqs(vdev
, nvqs
, vqs
, callbacks
, names
);
951 if (virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_VQ
)) {
954 if (virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_VLAN
))
955 dev
->features
|= NETIF_F_HW_VLAN_FILTER
;
958 /* Initialize our empty receive and send queues. */
959 skb_queue_head_init(&vi
->recv
);
960 skb_queue_head_init(&vi
->send
);
962 tasklet_init(&vi
->tasklet
, xmit_tasklet
, (unsigned long)vi
);
964 if (!vi
->free_in_tasklet
)
965 setup_timer(&vi
->xmit_free_timer
, xmit_free
, (unsigned long)vi
);
967 err
= register_netdev(dev
);
969 pr_debug("virtio_net: registering device failed\n");
973 /* Last of all, set up some receive buffers. */
974 try_fill_recv(vi
, GFP_KERNEL
);
976 /* If we didn't even get one input buffer, we're useless. */
982 vi
->status
= VIRTIO_NET_S_LINK_UP
;
983 virtnet_update_status(vi
);
984 netif_carrier_on(dev
);
986 pr_debug("virtnet: registered device %s\n", dev
->name
);
990 unregister_netdev(dev
);
991 cancel_delayed_work_sync(&vi
->refill
);
993 vdev
->config
->del_vqs(vdev
);
999 static void virtnet_remove(struct virtio_device
*vdev
)
1001 struct virtnet_info
*vi
= vdev
->priv
;
1002 struct sk_buff
*skb
;
1004 /* Stop all the virtqueues. */
1005 vdev
->config
->reset(vdev
);
1007 if (!vi
->free_in_tasklet
)
1008 del_timer_sync(&vi
->xmit_free_timer
);
1010 /* Free our skbs in send and recv queues, if any. */
1011 while ((skb
= __skb_dequeue(&vi
->recv
)) != NULL
) {
1015 __skb_queue_purge(&vi
->send
);
1017 BUG_ON(vi
->num
!= 0);
1019 unregister_netdev(vi
->dev
);
1020 cancel_delayed_work_sync(&vi
->refill
);
1022 vdev
->config
->del_vqs(vi
->vdev
);
1025 __free_pages(get_a_page(vi
, GFP_KERNEL
), 0);
1027 free_netdev(vi
->dev
);
1030 static struct virtio_device_id id_table
[] = {
1031 { VIRTIO_ID_NET
, VIRTIO_DEV_ANY_ID
},
1035 static unsigned int features
[] = {
1036 VIRTIO_NET_F_CSUM
, VIRTIO_NET_F_GUEST_CSUM
,
1037 VIRTIO_NET_F_GSO
, VIRTIO_NET_F_MAC
,
1038 VIRTIO_NET_F_HOST_TSO4
, VIRTIO_NET_F_HOST_UFO
, VIRTIO_NET_F_HOST_TSO6
,
1039 VIRTIO_NET_F_HOST_ECN
, VIRTIO_NET_F_GUEST_TSO4
, VIRTIO_NET_F_GUEST_TSO6
,
1040 VIRTIO_NET_F_GUEST_ECN
, VIRTIO_NET_F_GUEST_UFO
,
1041 VIRTIO_NET_F_MRG_RXBUF
, VIRTIO_NET_F_STATUS
, VIRTIO_NET_F_CTRL_VQ
,
1042 VIRTIO_NET_F_CTRL_RX
, VIRTIO_NET_F_CTRL_VLAN
,
1043 VIRTIO_F_NOTIFY_ON_EMPTY
,
1046 static struct virtio_driver virtio_net
= {
1047 .feature_table
= features
,
1048 .feature_table_size
= ARRAY_SIZE(features
),
1049 .driver
.name
= KBUILD_MODNAME
,
1050 .driver
.owner
= THIS_MODULE
,
1051 .id_table
= id_table
,
1052 .probe
= virtnet_probe
,
1053 .remove
= __devexit_p(virtnet_remove
),
1054 .config_changed
= virtnet_config_changed
,
1057 static int __init
init(void)
1059 return register_virtio_driver(&virtio_net
);
1062 static void __exit
fini(void)
1064 unregister_virtio_driver(&virtio_net
);
1069 MODULE_DEVICE_TABLE(virtio
, id_table
);
1070 MODULE_DESCRIPTION("Virtio network driver");
1071 MODULE_LICENSE("GPL");