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_ids.h>
26 #include <linux/virtio_net.h>
27 #include <linux/scatterlist.h>
28 #include <linux/if_vlan.h>
30 static int napi_weight
= 128;
31 module_param(napi_weight
, int, 0444);
33 static int csum
= 1, gso
= 1;
34 module_param(csum
, bool, 0444);
35 module_param(gso
, bool, 0444);
37 /* FIXME: MTU in config. */
38 #define MAX_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN)
39 #define GOOD_COPY_LEN 128
41 #define VIRTNET_SEND_COMMAND_SG_MAX 2
45 struct virtio_device
*vdev
;
46 struct virtqueue
*rvq
, *svq
, *cvq
;
47 struct net_device
*dev
;
48 struct napi_struct napi
;
51 /* Number of input buffers, and max we've ever had. */
52 unsigned int num
, max
;
54 /* I like... big packets and I cannot lie! */
57 /* Host will merge rx buffers for big packets (shake it! shake it!) */
58 bool mergeable_rx_bufs
;
60 /* Receive & send queues. */
61 struct sk_buff_head recv
;
62 struct sk_buff_head send
;
64 /* Work struct for refilling if we run low on memory. */
65 struct delayed_work refill
;
67 /* Chain pages by the private ptr. */
73 struct virtio_net_hdr hdr
;
74 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(vi
->dev
, MAX_PACKET_LEN
+ NET_IP_ALIGN
);
286 if (unlikely(!skb
)) {
291 skb_reserve(skb
, NET_IP_ALIGN
);
292 skb_put(skb
, MAX_PACKET_LEN
);
294 hdr
= skb_vnet_hdr(skb
);
295 sg_set_buf(sg
, &hdr
->hdr
, sizeof(hdr
->hdr
));
297 if (vi
->big_packets
) {
298 for (i
= 0; i
< MAX_SKB_FRAGS
; i
++) {
299 skb_frag_t
*f
= &skb_shinfo(skb
)->frags
[i
];
300 f
->page
= get_a_page(vi
, gfp
);
307 skb
->data_len
+= PAGE_SIZE
;
308 skb
->len
+= PAGE_SIZE
;
310 skb_shinfo(skb
)->nr_frags
++;
314 num
= skb_to_sgvec(skb
, sg
+1, 0, skb
->len
) + 1;
315 skb_queue_head(&vi
->recv
, skb
);
317 err
= vi
->rvq
->vq_ops
->add_buf(vi
->rvq
, sg
, 0, num
, skb
);
319 skb_unlink(skb
, &vi
->recv
);
326 if (unlikely(vi
->num
> vi
->max
))
328 vi
->rvq
->vq_ops
->kick(vi
->rvq
);
332 /* Returns false if we couldn't fill entirely (OOM). */
333 static bool try_fill_recv(struct virtnet_info
*vi
, gfp_t gfp
)
336 struct scatterlist sg
[1];
340 if (!vi
->mergeable_rx_bufs
)
341 return try_fill_recv_maxbufs(vi
, gfp
);
346 skb
= netdev_alloc_skb(vi
->dev
, GOOD_COPY_LEN
+ NET_IP_ALIGN
);
347 if (unlikely(!skb
)) {
352 skb_reserve(skb
, NET_IP_ALIGN
);
354 f
= &skb_shinfo(skb
)->frags
[0];
355 f
->page
= get_a_page(vi
, gfp
);
365 skb_shinfo(skb
)->nr_frags
++;
367 sg_init_one(sg
, page_address(f
->page
), PAGE_SIZE
);
368 skb_queue_head(&vi
->recv
, skb
);
370 err
= vi
->rvq
->vq_ops
->add_buf(vi
->rvq
, sg
, 0, 1, skb
);
372 skb_unlink(skb
, &vi
->recv
);
378 if (unlikely(vi
->num
> vi
->max
))
380 vi
->rvq
->vq_ops
->kick(vi
->rvq
);
384 static void skb_recv_done(struct virtqueue
*rvq
)
386 struct virtnet_info
*vi
= rvq
->vdev
->priv
;
387 /* Schedule NAPI, Suppress further interrupts if successful. */
388 if (napi_schedule_prep(&vi
->napi
)) {
389 rvq
->vq_ops
->disable_cb(rvq
);
390 __napi_schedule(&vi
->napi
);
394 static void refill_work(struct work_struct
*work
)
396 struct virtnet_info
*vi
;
399 vi
= container_of(work
, struct virtnet_info
, refill
.work
);
400 napi_disable(&vi
->napi
);
401 try_fill_recv(vi
, GFP_KERNEL
);
402 still_empty
= (vi
->num
== 0);
403 napi_enable(&vi
->napi
);
405 /* In theory, this can happen: if we don't get any buffers in
406 * we will *never* try to fill again. */
408 schedule_delayed_work(&vi
->refill
, HZ
/2);
411 static int virtnet_poll(struct napi_struct
*napi
, int budget
)
413 struct virtnet_info
*vi
= container_of(napi
, struct virtnet_info
, napi
);
414 struct sk_buff
*skb
= NULL
;
415 unsigned int len
, received
= 0;
418 while (received
< budget
&&
419 (skb
= vi
->rvq
->vq_ops
->get_buf(vi
->rvq
, &len
)) != NULL
) {
420 __skb_unlink(skb
, &vi
->recv
);
421 receive_skb(vi
->dev
, skb
, len
);
426 if (vi
->num
< vi
->max
/ 2) {
427 if (!try_fill_recv(vi
, GFP_ATOMIC
))
428 schedule_delayed_work(&vi
->refill
, 0);
431 /* Out of packets? */
432 if (received
< budget
) {
434 if (unlikely(!vi
->rvq
->vq_ops
->enable_cb(vi
->rvq
))
435 && napi_schedule_prep(napi
)) {
436 vi
->rvq
->vq_ops
->disable_cb(vi
->rvq
);
437 __napi_schedule(napi
);
445 static void free_old_xmit_skbs(struct virtnet_info
*vi
)
450 while ((skb
= vi
->svq
->vq_ops
->get_buf(vi
->svq
, &len
)) != NULL
) {
451 pr_debug("Sent skb %p\n", skb
);
452 __skb_unlink(skb
, &vi
->send
);
453 vi
->dev
->stats
.tx_bytes
+= skb
->len
;
454 vi
->dev
->stats
.tx_packets
++;
459 static int xmit_skb(struct virtnet_info
*vi
, struct sk_buff
*skb
)
462 struct scatterlist sg
[2+MAX_SKB_FRAGS
];
463 struct skb_vnet_hdr
*hdr
= skb_vnet_hdr(skb
);
464 const unsigned char *dest
= ((struct ethhdr
*)skb
->data
)->h_dest
;
466 sg_init_table(sg
, 2+MAX_SKB_FRAGS
);
468 pr_debug("%s: xmit %p %pM\n", vi
->dev
->name
, skb
, dest
);
470 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
471 hdr
->hdr
.flags
= VIRTIO_NET_HDR_F_NEEDS_CSUM
;
472 hdr
->hdr
.csum_start
= skb
->csum_start
- skb_headroom(skb
);
473 hdr
->hdr
.csum_offset
= skb
->csum_offset
;
476 hdr
->hdr
.csum_offset
= hdr
->hdr
.csum_start
= 0;
479 if (skb_is_gso(skb
)) {
480 hdr
->hdr
.hdr_len
= skb_headlen(skb
);
481 hdr
->hdr
.gso_size
= skb_shinfo(skb
)->gso_size
;
482 if (skb_shinfo(skb
)->gso_type
& SKB_GSO_TCPV4
)
483 hdr
->hdr
.gso_type
= VIRTIO_NET_HDR_GSO_TCPV4
;
484 else if (skb_shinfo(skb
)->gso_type
& SKB_GSO_TCPV6
)
485 hdr
->hdr
.gso_type
= VIRTIO_NET_HDR_GSO_TCPV6
;
486 else if (skb_shinfo(skb
)->gso_type
& SKB_GSO_UDP
)
487 hdr
->hdr
.gso_type
= VIRTIO_NET_HDR_GSO_UDP
;
490 if (skb_shinfo(skb
)->gso_type
& SKB_GSO_TCP_ECN
)
491 hdr
->hdr
.gso_type
|= VIRTIO_NET_HDR_GSO_ECN
;
493 hdr
->hdr
.gso_type
= VIRTIO_NET_HDR_GSO_NONE
;
494 hdr
->hdr
.gso_size
= hdr
->hdr
.hdr_len
= 0;
497 hdr
->mhdr
.num_buffers
= 0;
499 /* Encode metadata header at front. */
500 if (vi
->mergeable_rx_bufs
)
501 sg_set_buf(sg
, &hdr
->mhdr
, sizeof(hdr
->mhdr
));
503 sg_set_buf(sg
, &hdr
->hdr
, sizeof(hdr
->hdr
));
505 num
= skb_to_sgvec(skb
, sg
+1, 0, skb
->len
) + 1;
506 return vi
->svq
->vq_ops
->add_buf(vi
->svq
, sg
, num
, 0, skb
);
509 static netdev_tx_t
start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
511 struct virtnet_info
*vi
= netdev_priv(dev
);
514 /* Free up any pending old buffers before queueing new ones. */
515 free_old_xmit_skbs(vi
);
517 /* Put new one in send queue and do transmit */
518 __skb_queue_head(&vi
->send
, skb
);
519 if (likely(xmit_skb(vi
, skb
) >= 0)) {
520 vi
->svq
->vq_ops
->kick(vi
->svq
);
521 /* Don't wait up for transmitted skbs to be freed. */
527 /* Ring too full for this packet, remove it from queue again. */
528 pr_debug("%s: virtio not prepared to send\n", dev
->name
);
529 __skb_unlink(skb
, &vi
->send
);
530 netif_stop_queue(dev
);
532 /* Activate callback for using skbs: if this returns false it
533 * means some were used in the meantime. */
534 if (unlikely(!vi
->svq
->vq_ops
->enable_cb(vi
->svq
))) {
535 vi
->svq
->vq_ops
->disable_cb(vi
->svq
);
536 netif_start_queue(dev
);
539 return NETDEV_TX_BUSY
;
542 static int virtnet_set_mac_address(struct net_device
*dev
, void *p
)
544 struct virtnet_info
*vi
= netdev_priv(dev
);
545 struct virtio_device
*vdev
= vi
->vdev
;
548 ret
= eth_mac_addr(dev
, p
);
552 if (virtio_has_feature(vdev
, VIRTIO_NET_F_MAC
))
553 vdev
->config
->set(vdev
, offsetof(struct virtio_net_config
, mac
),
554 dev
->dev_addr
, dev
->addr_len
);
559 #ifdef CONFIG_NET_POLL_CONTROLLER
560 static void virtnet_netpoll(struct net_device
*dev
)
562 struct virtnet_info
*vi
= netdev_priv(dev
);
564 napi_schedule(&vi
->napi
);
568 static int virtnet_open(struct net_device
*dev
)
570 struct virtnet_info
*vi
= netdev_priv(dev
);
572 napi_enable(&vi
->napi
);
574 /* If all buffers were filled by other side before we napi_enabled, we
575 * won't get another interrupt, so process any outstanding packets
576 * now. virtnet_poll wants re-enable the queue, so we disable here.
577 * We synchronize against interrupts via NAPI_STATE_SCHED */
578 if (napi_schedule_prep(&vi
->napi
)) {
579 vi
->rvq
->vq_ops
->disable_cb(vi
->rvq
);
580 __napi_schedule(&vi
->napi
);
586 * Send command via the control virtqueue and check status. Commands
587 * supported by the hypervisor, as indicated by feature bits, should
588 * never fail unless improperly formated.
590 static bool virtnet_send_command(struct virtnet_info
*vi
, u8
class, u8 cmd
,
591 struct scatterlist
*data
, int out
, int in
)
593 struct scatterlist
*s
, sg
[VIRTNET_SEND_COMMAND_SG_MAX
+ 2];
594 struct virtio_net_ctrl_hdr ctrl
;
595 virtio_net_ctrl_ack status
= ~0;
599 /* Caller should know better */
600 BUG_ON(!virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_VQ
) ||
601 (out
+ in
> VIRTNET_SEND_COMMAND_SG_MAX
));
603 out
++; /* Add header */
604 in
++; /* Add return status */
609 sg_init_table(sg
, out
+ in
);
611 sg_set_buf(&sg
[0], &ctrl
, sizeof(ctrl
));
612 for_each_sg(data
, s
, out
+ in
- 2, i
)
613 sg_set_buf(&sg
[i
+ 1], sg_virt(s
), s
->length
);
614 sg_set_buf(&sg
[out
+ in
- 1], &status
, sizeof(status
));
616 BUG_ON(vi
->cvq
->vq_ops
->add_buf(vi
->cvq
, sg
, out
, in
, vi
) < 0);
618 vi
->cvq
->vq_ops
->kick(vi
->cvq
);
621 * Spin for a response, the kick causes an ioport write, trapping
622 * into the hypervisor, so the request should be handled immediately.
624 while (!vi
->cvq
->vq_ops
->get_buf(vi
->cvq
, &tmp
))
627 return status
== VIRTIO_NET_OK
;
630 static int virtnet_close(struct net_device
*dev
)
632 struct virtnet_info
*vi
= netdev_priv(dev
);
634 napi_disable(&vi
->napi
);
639 static int virtnet_set_tx_csum(struct net_device
*dev
, u32 data
)
641 struct virtnet_info
*vi
= netdev_priv(dev
);
642 struct virtio_device
*vdev
= vi
->vdev
;
644 if (data
&& !virtio_has_feature(vdev
, VIRTIO_NET_F_CSUM
))
647 return ethtool_op_set_tx_hw_csum(dev
, data
);
650 static void virtnet_set_rx_mode(struct net_device
*dev
)
652 struct virtnet_info
*vi
= netdev_priv(dev
);
653 struct scatterlist sg
[2];
654 u8 promisc
, allmulti
;
655 struct virtio_net_ctrl_mac
*mac_data
;
656 struct dev_addr_list
*addr
;
657 struct netdev_hw_addr
*ha
;
661 /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */
662 if (!virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_RX
))
665 promisc
= ((dev
->flags
& IFF_PROMISC
) != 0);
666 allmulti
= ((dev
->flags
& IFF_ALLMULTI
) != 0);
668 sg_init_one(sg
, &promisc
, sizeof(promisc
));
670 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_RX
,
671 VIRTIO_NET_CTRL_RX_PROMISC
,
673 dev_warn(&dev
->dev
, "Failed to %sable promisc mode.\n",
674 promisc
? "en" : "dis");
676 sg_init_one(sg
, &allmulti
, sizeof(allmulti
));
678 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_RX
,
679 VIRTIO_NET_CTRL_RX_ALLMULTI
,
681 dev_warn(&dev
->dev
, "Failed to %sable allmulti mode.\n",
682 allmulti
? "en" : "dis");
684 /* MAC filter - use one buffer for both lists */
685 mac_data
= buf
= kzalloc(((dev
->uc
.count
+ dev
->mc_count
) * ETH_ALEN
) +
686 (2 * sizeof(mac_data
->entries
)), GFP_ATOMIC
);
688 dev_warn(&dev
->dev
, "No memory for MAC address buffer\n");
692 sg_init_table(sg
, 2);
694 /* Store the unicast list and count in the front of the buffer */
695 mac_data
->entries
= dev
->uc
.count
;
697 list_for_each_entry(ha
, &dev
->uc
.list
, list
)
698 memcpy(&mac_data
->macs
[i
++][0], ha
->addr
, ETH_ALEN
);
700 sg_set_buf(&sg
[0], mac_data
,
701 sizeof(mac_data
->entries
) + (dev
->uc
.count
* ETH_ALEN
));
703 /* multicast list and count fill the end */
704 mac_data
= (void *)&mac_data
->macs
[dev
->uc
.count
][0];
706 mac_data
->entries
= dev
->mc_count
;
708 for (i
= 0; i
< dev
->mc_count
; i
++, addr
= addr
->next
)
709 memcpy(&mac_data
->macs
[i
][0], addr
->da_addr
, ETH_ALEN
);
711 sg_set_buf(&sg
[1], mac_data
,
712 sizeof(mac_data
->entries
) + (dev
->mc_count
* ETH_ALEN
));
714 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_MAC
,
715 VIRTIO_NET_CTRL_MAC_TABLE_SET
,
717 dev_warn(&dev
->dev
, "Failed to set MAC fitler table.\n");
722 static void virtnet_vlan_rx_add_vid(struct net_device
*dev
, u16 vid
)
724 struct virtnet_info
*vi
= netdev_priv(dev
);
725 struct scatterlist sg
;
727 sg_init_one(&sg
, &vid
, sizeof(vid
));
729 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_VLAN
,
730 VIRTIO_NET_CTRL_VLAN_ADD
, &sg
, 1, 0))
731 dev_warn(&dev
->dev
, "Failed to add VLAN ID %d.\n", vid
);
734 static void virtnet_vlan_rx_kill_vid(struct net_device
*dev
, u16 vid
)
736 struct virtnet_info
*vi
= netdev_priv(dev
);
737 struct scatterlist sg
;
739 sg_init_one(&sg
, &vid
, sizeof(vid
));
741 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_VLAN
,
742 VIRTIO_NET_CTRL_VLAN_DEL
, &sg
, 1, 0))
743 dev_warn(&dev
->dev
, "Failed to kill VLAN ID %d.\n", vid
);
746 static const struct ethtool_ops virtnet_ethtool_ops
= {
747 .set_tx_csum
= virtnet_set_tx_csum
,
748 .set_sg
= ethtool_op_set_sg
,
749 .set_tso
= ethtool_op_set_tso
,
750 .set_ufo
= ethtool_op_set_ufo
,
751 .get_link
= ethtool_op_get_link
,
755 #define MAX_MTU 65535
757 static int virtnet_change_mtu(struct net_device
*dev
, int new_mtu
)
759 if (new_mtu
< MIN_MTU
|| new_mtu
> MAX_MTU
)
765 static const struct net_device_ops virtnet_netdev
= {
766 .ndo_open
= virtnet_open
,
767 .ndo_stop
= virtnet_close
,
768 .ndo_start_xmit
= start_xmit
,
769 .ndo_validate_addr
= eth_validate_addr
,
770 .ndo_set_mac_address
= virtnet_set_mac_address
,
771 .ndo_set_rx_mode
= virtnet_set_rx_mode
,
772 .ndo_change_mtu
= virtnet_change_mtu
,
773 .ndo_vlan_rx_add_vid
= virtnet_vlan_rx_add_vid
,
774 .ndo_vlan_rx_kill_vid
= virtnet_vlan_rx_kill_vid
,
775 #ifdef CONFIG_NET_POLL_CONTROLLER
776 .ndo_poll_controller
= virtnet_netpoll
,
780 static void virtnet_update_status(struct virtnet_info
*vi
)
784 if (!virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_STATUS
))
787 vi
->vdev
->config
->get(vi
->vdev
,
788 offsetof(struct virtio_net_config
, status
),
791 /* Ignore unknown (future) status bits */
792 v
&= VIRTIO_NET_S_LINK_UP
;
799 if (vi
->status
& VIRTIO_NET_S_LINK_UP
) {
800 netif_carrier_on(vi
->dev
);
801 netif_wake_queue(vi
->dev
);
803 netif_carrier_off(vi
->dev
);
804 netif_stop_queue(vi
->dev
);
808 static void virtnet_config_changed(struct virtio_device
*vdev
)
810 struct virtnet_info
*vi
= vdev
->priv
;
812 virtnet_update_status(vi
);
815 static int virtnet_probe(struct virtio_device
*vdev
)
818 struct net_device
*dev
;
819 struct virtnet_info
*vi
;
820 struct virtqueue
*vqs
[3];
821 vq_callback_t
*callbacks
[] = { skb_recv_done
, skb_xmit_done
, NULL
};
822 const char *names
[] = { "input", "output", "control" };
825 /* Allocate ourselves a network device with room for our info */
826 dev
= alloc_etherdev(sizeof(struct virtnet_info
));
830 /* Set up network device as normal. */
831 dev
->netdev_ops
= &virtnet_netdev
;
832 dev
->features
= NETIF_F_HIGHDMA
;
833 SET_ETHTOOL_OPS(dev
, &virtnet_ethtool_ops
);
834 SET_NETDEV_DEV(dev
, &vdev
->dev
);
836 /* Do we support "hardware" checksums? */
837 if (csum
&& virtio_has_feature(vdev
, VIRTIO_NET_F_CSUM
)) {
838 /* This opens up the world of extra features. */
839 dev
->features
|= NETIF_F_HW_CSUM
|NETIF_F_SG
|NETIF_F_FRAGLIST
;
840 if (gso
&& virtio_has_feature(vdev
, VIRTIO_NET_F_GSO
)) {
841 dev
->features
|= NETIF_F_TSO
| NETIF_F_UFO
842 | NETIF_F_TSO_ECN
| NETIF_F_TSO6
;
844 /* Individual feature bits: what can host handle? */
845 if (gso
&& virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_TSO4
))
846 dev
->features
|= NETIF_F_TSO
;
847 if (gso
&& virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_TSO6
))
848 dev
->features
|= NETIF_F_TSO6
;
849 if (gso
&& virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_ECN
))
850 dev
->features
|= NETIF_F_TSO_ECN
;
851 if (gso
&& virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_UFO
))
852 dev
->features
|= NETIF_F_UFO
;
855 /* Configuration may specify what MAC to use. Otherwise random. */
856 if (virtio_has_feature(vdev
, VIRTIO_NET_F_MAC
)) {
857 vdev
->config
->get(vdev
,
858 offsetof(struct virtio_net_config
, mac
),
859 dev
->dev_addr
, dev
->addr_len
);
861 random_ether_addr(dev
->dev_addr
);
863 /* Set up our device-specific information */
864 vi
= netdev_priv(dev
);
865 netif_napi_add(dev
, &vi
->napi
, virtnet_poll
, napi_weight
);
870 INIT_DELAYED_WORK(&vi
->refill
, refill_work
);
872 /* If we can receive ANY GSO packets, we must allocate large ones. */
873 if (virtio_has_feature(vdev
, VIRTIO_NET_F_GUEST_TSO4
)
874 || virtio_has_feature(vdev
, VIRTIO_NET_F_GUEST_TSO6
)
875 || virtio_has_feature(vdev
, VIRTIO_NET_F_GUEST_ECN
))
876 vi
->big_packets
= true;
878 if (virtio_has_feature(vdev
, VIRTIO_NET_F_MRG_RXBUF
))
879 vi
->mergeable_rx_bufs
= true;
881 /* We expect two virtqueues, receive then send,
882 * and optionally control. */
883 nvqs
= virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_VQ
) ? 3 : 2;
885 err
= vdev
->config
->find_vqs(vdev
, nvqs
, vqs
, callbacks
, names
);
892 if (virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_VQ
)) {
895 if (virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_VLAN
))
896 dev
->features
|= NETIF_F_HW_VLAN_FILTER
;
899 /* Initialize our empty receive and send queues. */
900 skb_queue_head_init(&vi
->recv
);
901 skb_queue_head_init(&vi
->send
);
903 err
= register_netdev(dev
);
905 pr_debug("virtio_net: registering device failed\n");
909 /* Last of all, set up some receive buffers. */
910 try_fill_recv(vi
, GFP_KERNEL
);
912 /* If we didn't even get one input buffer, we're useless. */
918 vi
->status
= VIRTIO_NET_S_LINK_UP
;
919 virtnet_update_status(vi
);
920 netif_carrier_on(dev
);
922 pr_debug("virtnet: registered device %s\n", dev
->name
);
926 unregister_netdev(dev
);
927 cancel_delayed_work_sync(&vi
->refill
);
929 vdev
->config
->del_vqs(vdev
);
935 static void virtnet_remove(struct virtio_device
*vdev
)
937 struct virtnet_info
*vi
= vdev
->priv
;
940 /* Stop all the virtqueues. */
941 vdev
->config
->reset(vdev
);
943 /* Free our skbs in send and recv queues, if any. */
944 while ((skb
= __skb_dequeue(&vi
->recv
)) != NULL
) {
948 __skb_queue_purge(&vi
->send
);
950 BUG_ON(vi
->num
!= 0);
952 unregister_netdev(vi
->dev
);
953 cancel_delayed_work_sync(&vi
->refill
);
955 vdev
->config
->del_vqs(vi
->vdev
);
958 __free_pages(get_a_page(vi
, GFP_KERNEL
), 0);
960 free_netdev(vi
->dev
);
963 static struct virtio_device_id id_table
[] = {
964 { VIRTIO_ID_NET
, VIRTIO_DEV_ANY_ID
},
968 static unsigned int features
[] = {
969 VIRTIO_NET_F_CSUM
, VIRTIO_NET_F_GUEST_CSUM
,
970 VIRTIO_NET_F_GSO
, VIRTIO_NET_F_MAC
,
971 VIRTIO_NET_F_HOST_TSO4
, VIRTIO_NET_F_HOST_UFO
, VIRTIO_NET_F_HOST_TSO6
,
972 VIRTIO_NET_F_HOST_ECN
, VIRTIO_NET_F_GUEST_TSO4
, VIRTIO_NET_F_GUEST_TSO6
,
973 VIRTIO_NET_F_GUEST_ECN
, VIRTIO_NET_F_GUEST_UFO
,
974 VIRTIO_NET_F_MRG_RXBUF
, VIRTIO_NET_F_STATUS
, VIRTIO_NET_F_CTRL_VQ
,
975 VIRTIO_NET_F_CTRL_RX
, VIRTIO_NET_F_CTRL_VLAN
,
978 static struct virtio_driver virtio_net
= {
979 .feature_table
= features
,
980 .feature_table_size
= ARRAY_SIZE(features
),
981 .driver
.name
= KBUILD_MODNAME
,
982 .driver
.owner
= THIS_MODULE
,
983 .id_table
= id_table
,
984 .probe
= virtnet_probe
,
985 .remove
= __devexit_p(virtnet_remove
),
986 .config_changed
= virtnet_config_changed
,
989 static int __init
init(void)
991 return register_virtio_driver(&virtio_net
);
994 static void __exit
fini(void)
996 unregister_virtio_driver(&virtio_net
);
1001 MODULE_DEVICE_TABLE(virtio
, id_table
);
1002 MODULE_DESCRIPTION("Virtio network driver");
1003 MODULE_LICENSE("GPL");