1 /* A 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 /* Number of input buffers, and max we've ever had. */
51 unsigned int num
, max
;
53 /* I like... big packets and I cannot lie! */
56 /* Host will merge rx buffers for big packets (shake it! shake it!) */
57 bool mergeable_rx_bufs
;
59 /* Receive & send queues. */
60 struct sk_buff_head recv
;
61 struct sk_buff_head send
;
63 /* Work struct for refilling if we run low on memory. */
64 struct delayed_work refill
;
66 /* Chain pages by the private ptr. */
72 struct virtio_net_hdr hdr
;
73 struct virtio_net_hdr_mrg_rxbuf mhdr
;
78 static inline struct skb_vnet_hdr
*skb_vnet_hdr(struct sk_buff
*skb
)
80 return (struct skb_vnet_hdr
*)skb
->cb
;
83 static void give_a_page(struct virtnet_info
*vi
, struct page
*page
)
85 page
->private = (unsigned long)vi
->pages
;
89 static void trim_pages(struct virtnet_info
*vi
, struct sk_buff
*skb
)
93 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++)
94 give_a_page(vi
, skb_shinfo(skb
)->frags
[i
].page
);
95 skb_shinfo(skb
)->nr_frags
= 0;
99 static struct page
*get_a_page(struct virtnet_info
*vi
, gfp_t gfp_mask
)
101 struct page
*p
= vi
->pages
;
104 vi
->pages
= (struct page
*)p
->private;
106 p
= alloc_page(gfp_mask
);
110 static void skb_xmit_done(struct virtqueue
*svq
)
112 struct virtnet_info
*vi
= svq
->vdev
->priv
;
114 /* Suppress further interrupts. */
115 svq
->vq_ops
->disable_cb(svq
);
117 /* We were probably waiting for more output buffers. */
118 netif_wake_queue(vi
->dev
);
121 static void receive_skb(struct net_device
*dev
, struct sk_buff
*skb
,
124 struct virtnet_info
*vi
= netdev_priv(dev
);
125 struct skb_vnet_hdr
*hdr
= skb_vnet_hdr(skb
);
129 if (unlikely(len
< sizeof(struct virtio_net_hdr
) + ETH_HLEN
)) {
130 pr_debug("%s: short packet %i\n", dev
->name
, len
);
131 dev
->stats
.rx_length_errors
++;
135 if (vi
->mergeable_rx_bufs
) {
137 char *p
= page_address(skb_shinfo(skb
)->frags
[0].page
);
141 len
-= sizeof(struct virtio_net_hdr_mrg_rxbuf
);
143 memcpy(&hdr
->mhdr
, p
, sizeof(hdr
->mhdr
));
144 p
+= sizeof(hdr
->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(hdr
->mhdr
) + copy
;
160 skb_shinfo(skb
)->frags
[0].size
= len
;
161 skb
->data_len
+= len
;
165 while (--hdr
->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
, hdr
->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(hdr
->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
->hdr
.flags
& VIRTIO_NET_HDR_F_NEEDS_CSUM
) {
219 pr_debug("Needs csum!\n");
220 if (!skb_partial_csum_set(skb
,
222 hdr
->hdr
.csum_offset
))
226 skb
->protocol
= eth_type_trans(skb
, dev
);
227 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
228 ntohs(skb
->protocol
), skb
->len
, skb
->pkt_type
);
230 if (hdr
->hdr
.gso_type
!= VIRTIO_NET_HDR_GSO_NONE
) {
232 switch (hdr
->hdr
.gso_type
& ~VIRTIO_NET_HDR_GSO_ECN
) {
233 case VIRTIO_NET_HDR_GSO_TCPV4
:
234 skb_shinfo(skb
)->gso_type
= SKB_GSO_TCPV4
;
236 case VIRTIO_NET_HDR_GSO_UDP
:
237 skb_shinfo(skb
)->gso_type
= SKB_GSO_UDP
;
239 case VIRTIO_NET_HDR_GSO_TCPV6
:
240 skb_shinfo(skb
)->gso_type
= SKB_GSO_TCPV6
;
244 printk(KERN_WARNING
"%s: bad gso type %u.\n",
245 dev
->name
, hdr
->hdr
.gso_type
);
249 if (hdr
->hdr
.gso_type
& VIRTIO_NET_HDR_GSO_ECN
)
250 skb_shinfo(skb
)->gso_type
|= SKB_GSO_TCP_ECN
;
252 skb_shinfo(skb
)->gso_size
= hdr
->hdr
.gso_size
;
253 if (skb_shinfo(skb
)->gso_size
== 0) {
255 printk(KERN_WARNING
"%s: zero gso size.\n",
260 /* Header must be checked, and gso_segs computed. */
261 skb_shinfo(skb
)->gso_type
|= SKB_GSO_DODGY
;
262 skb_shinfo(skb
)->gso_segs
= 0;
265 netif_receive_skb(skb
);
269 dev
->stats
.rx_frame_errors
++;
274 static bool try_fill_recv_maxbufs(struct virtnet_info
*vi
, gfp_t gfp
)
277 struct scatterlist sg
[2+MAX_SKB_FRAGS
];
281 sg_init_table(sg
, 2+MAX_SKB_FRAGS
);
283 struct skb_vnet_hdr
*hdr
;
285 skb
= netdev_alloc_skb_ip_align(vi
->dev
, MAX_PACKET_LEN
);
286 if (unlikely(!skb
)) {
291 skb_put(skb
, MAX_PACKET_LEN
);
293 hdr
= skb_vnet_hdr(skb
);
294 sg_set_buf(sg
, &hdr
->hdr
, sizeof(hdr
->hdr
));
296 if (vi
->big_packets
) {
297 for (i
= 0; i
< MAX_SKB_FRAGS
; i
++) {
298 skb_frag_t
*f
= &skb_shinfo(skb
)->frags
[i
];
299 f
->page
= get_a_page(vi
, gfp
);
306 skb
->data_len
+= PAGE_SIZE
;
307 skb
->len
+= PAGE_SIZE
;
309 skb_shinfo(skb
)->nr_frags
++;
313 num
= skb_to_sgvec(skb
, sg
+1, 0, skb
->len
) + 1;
314 skb_queue_head(&vi
->recv
, skb
);
316 err
= vi
->rvq
->vq_ops
->add_buf(vi
->rvq
, sg
, 0, num
, skb
);
318 skb_unlink(skb
, &vi
->recv
);
324 } while (err
>= num
);
325 if (unlikely(vi
->num
> vi
->max
))
327 vi
->rvq
->vq_ops
->kick(vi
->rvq
);
331 /* Returns false if we couldn't fill entirely (OOM). */
332 static bool try_fill_recv(struct virtnet_info
*vi
, gfp_t gfp
)
335 struct scatterlist sg
[1];
339 if (!vi
->mergeable_rx_bufs
)
340 return try_fill_recv_maxbufs(vi
, gfp
);
345 skb
= netdev_alloc_skb_ip_align(vi
->dev
, GOOD_COPY_LEN
);
346 if (unlikely(!skb
)) {
351 f
= &skb_shinfo(skb
)->frags
[0];
352 f
->page
= get_a_page(vi
, gfp
);
362 skb_shinfo(skb
)->nr_frags
++;
364 sg_init_one(sg
, page_address(f
->page
), PAGE_SIZE
);
365 skb_queue_head(&vi
->recv
, skb
);
367 err
= vi
->rvq
->vq_ops
->add_buf(vi
->rvq
, sg
, 0, 1, skb
);
369 skb_unlink(skb
, &vi
->recv
);
375 if (unlikely(vi
->num
> vi
->max
))
377 vi
->rvq
->vq_ops
->kick(vi
->rvq
);
381 static void skb_recv_done(struct virtqueue
*rvq
)
383 struct virtnet_info
*vi
= rvq
->vdev
->priv
;
384 /* Schedule NAPI, Suppress further interrupts if successful. */
385 if (napi_schedule_prep(&vi
->napi
)) {
386 rvq
->vq_ops
->disable_cb(rvq
);
387 __napi_schedule(&vi
->napi
);
391 static void refill_work(struct work_struct
*work
)
393 struct virtnet_info
*vi
;
396 vi
= container_of(work
, struct virtnet_info
, refill
.work
);
397 napi_disable(&vi
->napi
);
398 try_fill_recv(vi
, GFP_KERNEL
);
399 still_empty
= (vi
->num
== 0);
400 napi_enable(&vi
->napi
);
402 /* In theory, this can happen: if we don't get any buffers in
403 * we will *never* try to fill again. */
405 schedule_delayed_work(&vi
->refill
, HZ
/2);
408 static int virtnet_poll(struct napi_struct
*napi
, int budget
)
410 struct virtnet_info
*vi
= container_of(napi
, struct virtnet_info
, napi
);
411 struct sk_buff
*skb
= NULL
;
412 unsigned int len
, received
= 0;
415 while (received
< budget
&&
416 (skb
= vi
->rvq
->vq_ops
->get_buf(vi
->rvq
, &len
)) != NULL
) {
417 __skb_unlink(skb
, &vi
->recv
);
418 receive_skb(vi
->dev
, skb
, len
);
423 if (vi
->num
< vi
->max
/ 2) {
424 if (!try_fill_recv(vi
, GFP_ATOMIC
))
425 schedule_delayed_work(&vi
->refill
, 0);
428 /* Out of packets? */
429 if (received
< budget
) {
431 if (unlikely(!vi
->rvq
->vq_ops
->enable_cb(vi
->rvq
)) &&
432 napi_schedule_prep(napi
)) {
433 vi
->rvq
->vq_ops
->disable_cb(vi
->rvq
);
434 __napi_schedule(napi
);
442 static unsigned int free_old_xmit_skbs(struct virtnet_info
*vi
)
445 unsigned int len
, tot_sgs
= 0;
447 while ((skb
= vi
->svq
->vq_ops
->get_buf(vi
->svq
, &len
)) != NULL
) {
448 pr_debug("Sent skb %p\n", skb
);
449 __skb_unlink(skb
, &vi
->send
);
450 vi
->dev
->stats
.tx_bytes
+= skb
->len
;
451 vi
->dev
->stats
.tx_packets
++;
452 tot_sgs
+= skb_vnet_hdr(skb
)->num_sg
;
453 dev_kfree_skb_any(skb
);
458 static int xmit_skb(struct virtnet_info
*vi
, struct sk_buff
*skb
)
460 struct scatterlist sg
[2+MAX_SKB_FRAGS
];
461 struct skb_vnet_hdr
*hdr
= skb_vnet_hdr(skb
);
462 const unsigned char *dest
= ((struct ethhdr
*)skb
->data
)->h_dest
;
464 sg_init_table(sg
, 2+MAX_SKB_FRAGS
);
466 pr_debug("%s: xmit %p %pM\n", vi
->dev
->name
, skb
, dest
);
468 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
469 hdr
->hdr
.flags
= VIRTIO_NET_HDR_F_NEEDS_CSUM
;
470 hdr
->hdr
.csum_start
= skb
->csum_start
- skb_headroom(skb
);
471 hdr
->hdr
.csum_offset
= skb
->csum_offset
;
474 hdr
->hdr
.csum_offset
= hdr
->hdr
.csum_start
= 0;
477 if (skb_is_gso(skb
)) {
478 hdr
->hdr
.hdr_len
= skb_headlen(skb
);
479 hdr
->hdr
.gso_size
= skb_shinfo(skb
)->gso_size
;
480 if (skb_shinfo(skb
)->gso_type
& SKB_GSO_TCPV4
)
481 hdr
->hdr
.gso_type
= VIRTIO_NET_HDR_GSO_TCPV4
;
482 else if (skb_shinfo(skb
)->gso_type
& SKB_GSO_TCPV6
)
483 hdr
->hdr
.gso_type
= VIRTIO_NET_HDR_GSO_TCPV6
;
484 else if (skb_shinfo(skb
)->gso_type
& SKB_GSO_UDP
)
485 hdr
->hdr
.gso_type
= VIRTIO_NET_HDR_GSO_UDP
;
488 if (skb_shinfo(skb
)->gso_type
& SKB_GSO_TCP_ECN
)
489 hdr
->hdr
.gso_type
|= VIRTIO_NET_HDR_GSO_ECN
;
491 hdr
->hdr
.gso_type
= VIRTIO_NET_HDR_GSO_NONE
;
492 hdr
->hdr
.gso_size
= hdr
->hdr
.hdr_len
= 0;
495 hdr
->mhdr
.num_buffers
= 0;
497 /* Encode metadata header at front. */
498 if (vi
->mergeable_rx_bufs
)
499 sg_set_buf(sg
, &hdr
->mhdr
, sizeof(hdr
->mhdr
));
501 sg_set_buf(sg
, &hdr
->hdr
, sizeof(hdr
->hdr
));
503 hdr
->num_sg
= skb_to_sgvec(skb
, sg
+1, 0, skb
->len
) + 1;
504 return vi
->svq
->vq_ops
->add_buf(vi
->svq
, sg
, hdr
->num_sg
, 0, skb
);
507 static netdev_tx_t
start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
509 struct virtnet_info
*vi
= netdev_priv(dev
);
513 /* Free up any pending old buffers before queueing new ones. */
514 free_old_xmit_skbs(vi
);
516 /* Try to transmit */
517 capacity
= xmit_skb(vi
, skb
);
519 /* This can happen with OOM and indirect buffers. */
520 if (unlikely(capacity
< 0)) {
521 netif_stop_queue(dev
);
522 dev_warn(&dev
->dev
, "Unexpected full queue\n");
523 if (unlikely(!vi
->svq
->vq_ops
->enable_cb(vi
->svq
))) {
524 vi
->svq
->vq_ops
->disable_cb(vi
->svq
);
525 netif_start_queue(dev
);
528 return NETDEV_TX_BUSY
;
530 vi
->svq
->vq_ops
->kick(vi
->svq
);
533 * Put new one in send queue. You'd expect we'd need this before
534 * xmit_skb calls add_buf(), since the callback can be triggered
535 * immediately after that. But since the callback just triggers
536 * another call back here, normal network xmit locking prevents the
539 __skb_queue_head(&vi
->send
, skb
);
541 /* Don't wait up for transmitted skbs to be freed. */
545 /* Apparently nice girls don't return TX_BUSY; stop the queue
546 * before it gets out of hand. Naturally, this wastes entries. */
547 if (capacity
< 2+MAX_SKB_FRAGS
) {
548 netif_stop_queue(dev
);
549 if (unlikely(!vi
->svq
->vq_ops
->enable_cb(vi
->svq
))) {
550 /* More just got used, free them then recheck. */
551 capacity
+= free_old_xmit_skbs(vi
);
552 if (capacity
>= 2+MAX_SKB_FRAGS
) {
553 netif_start_queue(dev
);
554 vi
->svq
->vq_ops
->disable_cb(vi
->svq
);
562 static int virtnet_set_mac_address(struct net_device
*dev
, void *p
)
564 struct virtnet_info
*vi
= netdev_priv(dev
);
565 struct virtio_device
*vdev
= vi
->vdev
;
568 ret
= eth_mac_addr(dev
, p
);
572 if (virtio_has_feature(vdev
, VIRTIO_NET_F_MAC
))
573 vdev
->config
->set(vdev
, offsetof(struct virtio_net_config
, mac
),
574 dev
->dev_addr
, dev
->addr_len
);
579 #ifdef CONFIG_NET_POLL_CONTROLLER
580 static void virtnet_netpoll(struct net_device
*dev
)
582 struct virtnet_info
*vi
= netdev_priv(dev
);
584 napi_schedule(&vi
->napi
);
588 static int virtnet_open(struct net_device
*dev
)
590 struct virtnet_info
*vi
= netdev_priv(dev
);
592 napi_enable(&vi
->napi
);
594 /* If all buffers were filled by other side before we napi_enabled, we
595 * won't get another interrupt, so process any outstanding packets
596 * now. virtnet_poll wants re-enable the queue, so we disable here.
597 * We synchronize against interrupts via NAPI_STATE_SCHED */
598 if (napi_schedule_prep(&vi
->napi
)) {
599 vi
->rvq
->vq_ops
->disable_cb(vi
->rvq
);
600 __napi_schedule(&vi
->napi
);
606 * Send command via the control virtqueue and check status. Commands
607 * supported by the hypervisor, as indicated by feature bits, should
608 * never fail unless improperly formated.
610 static bool virtnet_send_command(struct virtnet_info
*vi
, u8
class, u8 cmd
,
611 struct scatterlist
*data
, int out
, int in
)
613 struct scatterlist
*s
, sg
[VIRTNET_SEND_COMMAND_SG_MAX
+ 2];
614 struct virtio_net_ctrl_hdr ctrl
;
615 virtio_net_ctrl_ack status
= ~0;
619 /* Caller should know better */
620 BUG_ON(!virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_VQ
) ||
621 (out
+ in
> VIRTNET_SEND_COMMAND_SG_MAX
));
623 out
++; /* Add header */
624 in
++; /* Add return status */
629 sg_init_table(sg
, out
+ in
);
631 sg_set_buf(&sg
[0], &ctrl
, sizeof(ctrl
));
632 for_each_sg(data
, s
, out
+ in
- 2, i
)
633 sg_set_buf(&sg
[i
+ 1], sg_virt(s
), s
->length
);
634 sg_set_buf(&sg
[out
+ in
- 1], &status
, sizeof(status
));
636 BUG_ON(vi
->cvq
->vq_ops
->add_buf(vi
->cvq
, sg
, out
, in
, vi
) < 0);
638 vi
->cvq
->vq_ops
->kick(vi
->cvq
);
641 * Spin for a response, the kick causes an ioport write, trapping
642 * into the hypervisor, so the request should be handled immediately.
644 while (!vi
->cvq
->vq_ops
->get_buf(vi
->cvq
, &tmp
))
647 return status
== VIRTIO_NET_OK
;
650 static int virtnet_close(struct net_device
*dev
)
652 struct virtnet_info
*vi
= netdev_priv(dev
);
654 napi_disable(&vi
->napi
);
659 static int virtnet_set_tx_csum(struct net_device
*dev
, u32 data
)
661 struct virtnet_info
*vi
= netdev_priv(dev
);
662 struct virtio_device
*vdev
= vi
->vdev
;
664 if (data
&& !virtio_has_feature(vdev
, VIRTIO_NET_F_CSUM
))
667 return ethtool_op_set_tx_hw_csum(dev
, data
);
670 static void virtnet_set_rx_mode(struct net_device
*dev
)
672 struct virtnet_info
*vi
= netdev_priv(dev
);
673 struct scatterlist sg
[2];
674 u8 promisc
, allmulti
;
675 struct virtio_net_ctrl_mac
*mac_data
;
676 struct dev_addr_list
*addr
;
677 struct netdev_hw_addr
*ha
;
681 /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */
682 if (!virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_RX
))
685 promisc
= ((dev
->flags
& IFF_PROMISC
) != 0);
686 allmulti
= ((dev
->flags
& IFF_ALLMULTI
) != 0);
688 sg_init_one(sg
, &promisc
, sizeof(promisc
));
690 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_RX
,
691 VIRTIO_NET_CTRL_RX_PROMISC
,
693 dev_warn(&dev
->dev
, "Failed to %sable promisc mode.\n",
694 promisc
? "en" : "dis");
696 sg_init_one(sg
, &allmulti
, sizeof(allmulti
));
698 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_RX
,
699 VIRTIO_NET_CTRL_RX_ALLMULTI
,
701 dev_warn(&dev
->dev
, "Failed to %sable allmulti mode.\n",
702 allmulti
? "en" : "dis");
704 /* MAC filter - use one buffer for both lists */
705 mac_data
= buf
= kzalloc(((dev
->uc
.count
+ dev
->mc_count
) * ETH_ALEN
) +
706 (2 * sizeof(mac_data
->entries
)), GFP_ATOMIC
);
708 dev_warn(&dev
->dev
, "No memory for MAC address buffer\n");
712 sg_init_table(sg
, 2);
714 /* Store the unicast list and count in the front of the buffer */
715 mac_data
->entries
= dev
->uc
.count
;
717 list_for_each_entry(ha
, &dev
->uc
.list
, list
)
718 memcpy(&mac_data
->macs
[i
++][0], ha
->addr
, ETH_ALEN
);
720 sg_set_buf(&sg
[0], mac_data
,
721 sizeof(mac_data
->entries
) + (dev
->uc
.count
* ETH_ALEN
));
723 /* multicast list and count fill the end */
724 mac_data
= (void *)&mac_data
->macs
[dev
->uc
.count
][0];
726 mac_data
->entries
= dev
->mc_count
;
728 for (i
= 0; i
< dev
->mc_count
; i
++, addr
= addr
->next
)
729 memcpy(&mac_data
->macs
[i
][0], addr
->da_addr
, ETH_ALEN
);
731 sg_set_buf(&sg
[1], mac_data
,
732 sizeof(mac_data
->entries
) + (dev
->mc_count
* ETH_ALEN
));
734 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_MAC
,
735 VIRTIO_NET_CTRL_MAC_TABLE_SET
,
737 dev_warn(&dev
->dev
, "Failed to set MAC fitler table.\n");
742 static void virtnet_vlan_rx_add_vid(struct net_device
*dev
, u16 vid
)
744 struct virtnet_info
*vi
= netdev_priv(dev
);
745 struct scatterlist sg
;
747 sg_init_one(&sg
, &vid
, sizeof(vid
));
749 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_VLAN
,
750 VIRTIO_NET_CTRL_VLAN_ADD
, &sg
, 1, 0))
751 dev_warn(&dev
->dev
, "Failed to add VLAN ID %d.\n", vid
);
754 static void virtnet_vlan_rx_kill_vid(struct net_device
*dev
, u16 vid
)
756 struct virtnet_info
*vi
= netdev_priv(dev
);
757 struct scatterlist sg
;
759 sg_init_one(&sg
, &vid
, sizeof(vid
));
761 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_VLAN
,
762 VIRTIO_NET_CTRL_VLAN_DEL
, &sg
, 1, 0))
763 dev_warn(&dev
->dev
, "Failed to kill VLAN ID %d.\n", vid
);
766 static const struct ethtool_ops virtnet_ethtool_ops
= {
767 .set_tx_csum
= virtnet_set_tx_csum
,
768 .set_sg
= ethtool_op_set_sg
,
769 .set_tso
= ethtool_op_set_tso
,
770 .set_ufo
= ethtool_op_set_ufo
,
771 .get_link
= ethtool_op_get_link
,
775 #define MAX_MTU 65535
777 static int virtnet_change_mtu(struct net_device
*dev
, int new_mtu
)
779 if (new_mtu
< MIN_MTU
|| new_mtu
> MAX_MTU
)
785 static const struct net_device_ops virtnet_netdev
= {
786 .ndo_open
= virtnet_open
,
787 .ndo_stop
= virtnet_close
,
788 .ndo_start_xmit
= start_xmit
,
789 .ndo_validate_addr
= eth_validate_addr
,
790 .ndo_set_mac_address
= virtnet_set_mac_address
,
791 .ndo_set_rx_mode
= virtnet_set_rx_mode
,
792 .ndo_change_mtu
= virtnet_change_mtu
,
793 .ndo_vlan_rx_add_vid
= virtnet_vlan_rx_add_vid
,
794 .ndo_vlan_rx_kill_vid
= virtnet_vlan_rx_kill_vid
,
795 #ifdef CONFIG_NET_POLL_CONTROLLER
796 .ndo_poll_controller
= virtnet_netpoll
,
800 static void virtnet_update_status(struct virtnet_info
*vi
)
804 if (!virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_STATUS
))
807 vi
->vdev
->config
->get(vi
->vdev
,
808 offsetof(struct virtio_net_config
, status
),
811 /* Ignore unknown (future) status bits */
812 v
&= VIRTIO_NET_S_LINK_UP
;
819 if (vi
->status
& VIRTIO_NET_S_LINK_UP
) {
820 netif_carrier_on(vi
->dev
);
821 netif_wake_queue(vi
->dev
);
823 netif_carrier_off(vi
->dev
);
824 netif_stop_queue(vi
->dev
);
828 static void virtnet_config_changed(struct virtio_device
*vdev
)
830 struct virtnet_info
*vi
= vdev
->priv
;
832 virtnet_update_status(vi
);
835 static int virtnet_probe(struct virtio_device
*vdev
)
838 struct net_device
*dev
;
839 struct virtnet_info
*vi
;
840 struct virtqueue
*vqs
[3];
841 vq_callback_t
*callbacks
[] = { skb_recv_done
, skb_xmit_done
, NULL
};
842 const char *names
[] = { "input", "output", "control" };
845 /* Allocate ourselves a network device with room for our info */
846 dev
= alloc_etherdev(sizeof(struct virtnet_info
));
850 /* Set up network device as normal. */
851 dev
->netdev_ops
= &virtnet_netdev
;
852 dev
->features
= NETIF_F_HIGHDMA
;
853 SET_ETHTOOL_OPS(dev
, &virtnet_ethtool_ops
);
854 SET_NETDEV_DEV(dev
, &vdev
->dev
);
856 /* Do we support "hardware" checksums? */
857 if (csum
&& virtio_has_feature(vdev
, VIRTIO_NET_F_CSUM
)) {
858 /* This opens up the world of extra features. */
859 dev
->features
|= NETIF_F_HW_CSUM
|NETIF_F_SG
|NETIF_F_FRAGLIST
;
860 if (gso
&& virtio_has_feature(vdev
, VIRTIO_NET_F_GSO
)) {
861 dev
->features
|= NETIF_F_TSO
| NETIF_F_UFO
862 | NETIF_F_TSO_ECN
| NETIF_F_TSO6
;
864 /* Individual feature bits: what can host handle? */
865 if (gso
&& virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_TSO4
))
866 dev
->features
|= NETIF_F_TSO
;
867 if (gso
&& virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_TSO6
))
868 dev
->features
|= NETIF_F_TSO6
;
869 if (gso
&& virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_ECN
))
870 dev
->features
|= NETIF_F_TSO_ECN
;
871 if (gso
&& virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_UFO
))
872 dev
->features
|= NETIF_F_UFO
;
875 /* Configuration may specify what MAC to use. Otherwise random. */
876 if (virtio_has_feature(vdev
, VIRTIO_NET_F_MAC
)) {
877 vdev
->config
->get(vdev
,
878 offsetof(struct virtio_net_config
, mac
),
879 dev
->dev_addr
, dev
->addr_len
);
881 random_ether_addr(dev
->dev_addr
);
883 /* Set up our device-specific information */
884 vi
= netdev_priv(dev
);
885 netif_napi_add(dev
, &vi
->napi
, virtnet_poll
, napi_weight
);
890 INIT_DELAYED_WORK(&vi
->refill
, refill_work
);
892 /* If we can receive ANY GSO packets, we must allocate large ones. */
893 if (virtio_has_feature(vdev
, VIRTIO_NET_F_GUEST_TSO4
) ||
894 virtio_has_feature(vdev
, VIRTIO_NET_F_GUEST_TSO6
) ||
895 virtio_has_feature(vdev
, VIRTIO_NET_F_GUEST_ECN
))
896 vi
->big_packets
= true;
898 if (virtio_has_feature(vdev
, VIRTIO_NET_F_MRG_RXBUF
))
899 vi
->mergeable_rx_bufs
= true;
901 /* We expect two virtqueues, receive then send,
902 * and optionally control. */
903 nvqs
= virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_VQ
) ? 3 : 2;
905 err
= vdev
->config
->find_vqs(vdev
, nvqs
, vqs
, callbacks
, names
);
912 if (virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_VQ
)) {
915 if (virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_VLAN
))
916 dev
->features
|= NETIF_F_HW_VLAN_FILTER
;
919 /* Initialize our empty receive and send queues. */
920 skb_queue_head_init(&vi
->recv
);
921 skb_queue_head_init(&vi
->send
);
923 err
= register_netdev(dev
);
925 pr_debug("virtio_net: registering device failed\n");
929 /* Last of all, set up some receive buffers. */
930 try_fill_recv(vi
, GFP_KERNEL
);
932 /* If we didn't even get one input buffer, we're useless. */
938 vi
->status
= VIRTIO_NET_S_LINK_UP
;
939 virtnet_update_status(vi
);
940 netif_carrier_on(dev
);
942 pr_debug("virtnet: registered device %s\n", dev
->name
);
946 unregister_netdev(dev
);
947 cancel_delayed_work_sync(&vi
->refill
);
949 vdev
->config
->del_vqs(vdev
);
955 static void __devexit
virtnet_remove(struct virtio_device
*vdev
)
957 struct virtnet_info
*vi
= vdev
->priv
;
960 /* Stop all the virtqueues. */
961 vdev
->config
->reset(vdev
);
963 /* Free our skbs in send and recv queues, if any. */
964 while ((skb
= __skb_dequeue(&vi
->recv
)) != NULL
) {
968 __skb_queue_purge(&vi
->send
);
970 BUG_ON(vi
->num
!= 0);
972 unregister_netdev(vi
->dev
);
973 cancel_delayed_work_sync(&vi
->refill
);
975 vdev
->config
->del_vqs(vi
->vdev
);
978 __free_pages(get_a_page(vi
, GFP_KERNEL
), 0);
980 free_netdev(vi
->dev
);
983 static struct virtio_device_id id_table
[] = {
984 { VIRTIO_ID_NET
, VIRTIO_DEV_ANY_ID
},
988 static unsigned int features
[] = {
989 VIRTIO_NET_F_CSUM
, VIRTIO_NET_F_GUEST_CSUM
,
990 VIRTIO_NET_F_GSO
, VIRTIO_NET_F_MAC
,
991 VIRTIO_NET_F_HOST_TSO4
, VIRTIO_NET_F_HOST_UFO
, VIRTIO_NET_F_HOST_TSO6
,
992 VIRTIO_NET_F_HOST_ECN
, VIRTIO_NET_F_GUEST_TSO4
, VIRTIO_NET_F_GUEST_TSO6
,
993 VIRTIO_NET_F_GUEST_ECN
, VIRTIO_NET_F_GUEST_UFO
,
994 VIRTIO_NET_F_MRG_RXBUF
, VIRTIO_NET_F_STATUS
, VIRTIO_NET_F_CTRL_VQ
,
995 VIRTIO_NET_F_CTRL_RX
, VIRTIO_NET_F_CTRL_VLAN
,
998 static struct virtio_driver virtio_net_driver
= {
999 .feature_table
= features
,
1000 .feature_table_size
= ARRAY_SIZE(features
),
1001 .driver
.name
= KBUILD_MODNAME
,
1002 .driver
.owner
= THIS_MODULE
,
1003 .id_table
= id_table
,
1004 .probe
= virtnet_probe
,
1005 .remove
= __devexit_p(virtnet_remove
),
1006 .config_changed
= virtnet_config_changed
,
1009 static int __init
init(void)
1011 return register_virtio_driver(&virtio_net_driver
);
1014 static void __exit
fini(void)
1016 unregister_virtio_driver(&virtio_net_driver
);
1021 MODULE_DEVICE_TABLE(virtio
, id_table
);
1022 MODULE_DESCRIPTION("Virtio network driver");
1023 MODULE_LICENSE("GPL");