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>
28 #include <linux/slab.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 /* Work struct for refilling if we run low on memory. */
61 struct delayed_work refill
;
63 /* Chain pages by the private ptr. */
69 struct virtio_net_hdr hdr
;
70 struct virtio_net_hdr_mrg_rxbuf mhdr
;
75 struct padded_vnet_hdr
{
76 struct virtio_net_hdr hdr
;
78 * virtio_net_hdr should be in a separated sg buffer because of a
79 * QEMU bug, and data sg buffer shares same page with this header sg.
80 * This padding makes next sg 16 byte aligned after virtio_net_hdr.
85 static inline struct skb_vnet_hdr
*skb_vnet_hdr(struct sk_buff
*skb
)
87 return (struct skb_vnet_hdr
*)skb
->cb
;
91 * private is used to chain pages for big packets, put the whole
92 * most recent used list in the beginning for reuse
94 static void give_pages(struct virtnet_info
*vi
, struct page
*page
)
98 /* Find end of list, sew whole thing into vi->pages. */
99 for (end
= page
; end
->private; end
= (struct page
*)end
->private);
100 end
->private = (unsigned long)vi
->pages
;
104 static struct page
*get_a_page(struct virtnet_info
*vi
, gfp_t gfp_mask
)
106 struct page
*p
= vi
->pages
;
109 vi
->pages
= (struct page
*)p
->private;
110 /* clear private here, it is used to chain pages */
113 p
= alloc_page(gfp_mask
);
117 static void skb_xmit_done(struct virtqueue
*svq
)
119 struct virtnet_info
*vi
= svq
->vdev
->priv
;
121 /* Suppress further interrupts. */
122 svq
->vq_ops
->disable_cb(svq
);
124 /* We were probably waiting for more output buffers. */
125 netif_wake_queue(vi
->dev
);
128 static void set_skb_frag(struct sk_buff
*skb
, struct page
*page
,
129 unsigned int offset
, unsigned int *len
)
131 int i
= skb_shinfo(skb
)->nr_frags
;
134 f
= &skb_shinfo(skb
)->frags
[i
];
135 f
->size
= min((unsigned)PAGE_SIZE
- offset
, *len
);
136 f
->page_offset
= offset
;
139 skb
->data_len
+= f
->size
;
141 skb_shinfo(skb
)->nr_frags
++;
145 static struct sk_buff
*page_to_skb(struct virtnet_info
*vi
,
146 struct page
*page
, unsigned int len
)
149 struct skb_vnet_hdr
*hdr
;
150 unsigned int copy
, hdr_len
, offset
;
153 p
= page_address(page
);
155 /* copy small packet so we can reuse these pages for small data */
156 skb
= netdev_alloc_skb_ip_align(vi
->dev
, GOOD_COPY_LEN
);
160 hdr
= skb_vnet_hdr(skb
);
162 if (vi
->mergeable_rx_bufs
) {
163 hdr_len
= sizeof hdr
->mhdr
;
166 hdr_len
= sizeof hdr
->hdr
;
167 offset
= sizeof(struct padded_vnet_hdr
);
170 memcpy(hdr
, p
, hdr_len
);
176 if (copy
> skb_tailroom(skb
))
177 copy
= skb_tailroom(skb
);
178 memcpy(skb_put(skb
, copy
), p
, copy
);
184 set_skb_frag(skb
, page
, offset
, &len
);
185 page
= (struct page
*)page
->private;
190 give_pages(vi
, page
);
195 static int receive_mergeable(struct virtnet_info
*vi
, struct sk_buff
*skb
)
197 struct skb_vnet_hdr
*hdr
= skb_vnet_hdr(skb
);
201 num_buf
= hdr
->mhdr
.num_buffers
;
203 i
= skb_shinfo(skb
)->nr_frags
;
204 if (i
>= MAX_SKB_FRAGS
) {
205 pr_debug("%s: packet too long\n", skb
->dev
->name
);
206 skb
->dev
->stats
.rx_length_errors
++;
210 page
= vi
->rvq
->vq_ops
->get_buf(vi
->rvq
, &len
);
212 pr_debug("%s: rx error: %d buffers missing\n",
213 skb
->dev
->name
, hdr
->mhdr
.num_buffers
);
214 skb
->dev
->stats
.rx_length_errors
++;
220 set_skb_frag(skb
, page
, 0, &len
);
227 static void receive_buf(struct net_device
*dev
, void *buf
, unsigned int len
)
229 struct virtnet_info
*vi
= netdev_priv(dev
);
232 struct skb_vnet_hdr
*hdr
;
234 if (unlikely(len
< sizeof(struct virtio_net_hdr
) + ETH_HLEN
)) {
235 pr_debug("%s: short packet %i\n", dev
->name
, len
);
236 dev
->stats
.rx_length_errors
++;
237 if (vi
->mergeable_rx_bufs
|| vi
->big_packets
)
244 if (!vi
->mergeable_rx_bufs
&& !vi
->big_packets
) {
246 len
-= sizeof(struct virtio_net_hdr
);
250 skb
= page_to_skb(vi
, page
, len
);
251 if (unlikely(!skb
)) {
252 dev
->stats
.rx_dropped
++;
253 give_pages(vi
, page
);
256 if (vi
->mergeable_rx_bufs
)
257 if (receive_mergeable(vi
, skb
)) {
263 hdr
= skb_vnet_hdr(skb
);
264 skb
->truesize
+= skb
->data_len
;
265 dev
->stats
.rx_bytes
+= skb
->len
;
266 dev
->stats
.rx_packets
++;
268 if (hdr
->hdr
.flags
& VIRTIO_NET_HDR_F_NEEDS_CSUM
) {
269 pr_debug("Needs csum!\n");
270 if (!skb_partial_csum_set(skb
,
272 hdr
->hdr
.csum_offset
))
276 skb
->protocol
= eth_type_trans(skb
, dev
);
277 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
278 ntohs(skb
->protocol
), skb
->len
, skb
->pkt_type
);
280 if (hdr
->hdr
.gso_type
!= VIRTIO_NET_HDR_GSO_NONE
) {
282 switch (hdr
->hdr
.gso_type
& ~VIRTIO_NET_HDR_GSO_ECN
) {
283 case VIRTIO_NET_HDR_GSO_TCPV4
:
284 skb_shinfo(skb
)->gso_type
= SKB_GSO_TCPV4
;
286 case VIRTIO_NET_HDR_GSO_UDP
:
287 skb_shinfo(skb
)->gso_type
= SKB_GSO_UDP
;
289 case VIRTIO_NET_HDR_GSO_TCPV6
:
290 skb_shinfo(skb
)->gso_type
= SKB_GSO_TCPV6
;
294 printk(KERN_WARNING
"%s: bad gso type %u.\n",
295 dev
->name
, hdr
->hdr
.gso_type
);
299 if (hdr
->hdr
.gso_type
& VIRTIO_NET_HDR_GSO_ECN
)
300 skb_shinfo(skb
)->gso_type
|= SKB_GSO_TCP_ECN
;
302 skb_shinfo(skb
)->gso_size
= hdr
->hdr
.gso_size
;
303 if (skb_shinfo(skb
)->gso_size
== 0) {
305 printk(KERN_WARNING
"%s: zero gso size.\n",
310 /* Header must be checked, and gso_segs computed. */
311 skb_shinfo(skb
)->gso_type
|= SKB_GSO_DODGY
;
312 skb_shinfo(skb
)->gso_segs
= 0;
315 netif_receive_skb(skb
);
319 dev
->stats
.rx_frame_errors
++;
323 static int add_recvbuf_small(struct virtnet_info
*vi
, gfp_t gfp
)
326 struct skb_vnet_hdr
*hdr
;
327 struct scatterlist sg
[2];
330 skb
= netdev_alloc_skb_ip_align(vi
->dev
, MAX_PACKET_LEN
);
334 skb_put(skb
, MAX_PACKET_LEN
);
336 hdr
= skb_vnet_hdr(skb
);
337 sg_set_buf(sg
, &hdr
->hdr
, sizeof hdr
->hdr
);
339 skb_to_sgvec(skb
, sg
+ 1, 0, skb
->len
);
341 err
= vi
->rvq
->vq_ops
->add_buf(vi
->rvq
, sg
, 0, 2, skb
);
348 static int add_recvbuf_big(struct virtnet_info
*vi
, gfp_t gfp
)
350 struct scatterlist sg
[MAX_SKB_FRAGS
+ 2];
351 struct page
*first
, *list
= NULL
;
355 /* page in sg[MAX_SKB_FRAGS + 1] is list tail */
356 for (i
= MAX_SKB_FRAGS
+ 1; i
> 1; --i
) {
357 first
= get_a_page(vi
, gfp
);
360 give_pages(vi
, list
);
363 sg_set_buf(&sg
[i
], page_address(first
), PAGE_SIZE
);
365 /* chain new page in list head to match sg */
366 first
->private = (unsigned long)list
;
370 first
= get_a_page(vi
, gfp
);
372 give_pages(vi
, list
);
375 p
= page_address(first
);
377 /* sg[0], sg[1] share the same page */
378 /* a separated sg[0] for virtio_net_hdr only during to QEMU bug*/
379 sg_set_buf(&sg
[0], p
, sizeof(struct virtio_net_hdr
));
381 /* sg[1] for data packet, from offset */
382 offset
= sizeof(struct padded_vnet_hdr
);
383 sg_set_buf(&sg
[1], p
+ offset
, PAGE_SIZE
- offset
);
385 /* chain first in list head */
386 first
->private = (unsigned long)list
;
387 err
= vi
->rvq
->vq_ops
->add_buf(vi
->rvq
, sg
, 0, MAX_SKB_FRAGS
+ 2,
390 give_pages(vi
, first
);
395 static int add_recvbuf_mergeable(struct virtnet_info
*vi
, gfp_t gfp
)
398 struct scatterlist sg
;
401 page
= get_a_page(vi
, gfp
);
405 sg_init_one(&sg
, page_address(page
), PAGE_SIZE
);
407 err
= vi
->rvq
->vq_ops
->add_buf(vi
->rvq
, &sg
, 0, 1, page
);
409 give_pages(vi
, page
);
414 /* Returns false if we couldn't fill entirely (OOM). */
415 static bool try_fill_recv(struct virtnet_info
*vi
, gfp_t gfp
)
421 if (vi
->mergeable_rx_bufs
)
422 err
= add_recvbuf_mergeable(vi
, gfp
);
423 else if (vi
->big_packets
)
424 err
= add_recvbuf_big(vi
, gfp
);
426 err
= add_recvbuf_small(vi
, gfp
);
434 if (unlikely(vi
->num
> vi
->max
))
436 vi
->rvq
->vq_ops
->kick(vi
->rvq
);
440 static void skb_recv_done(struct virtqueue
*rvq
)
442 struct virtnet_info
*vi
= rvq
->vdev
->priv
;
443 /* Schedule NAPI, Suppress further interrupts if successful. */
444 if (napi_schedule_prep(&vi
->napi
)) {
445 rvq
->vq_ops
->disable_cb(rvq
);
446 __napi_schedule(&vi
->napi
);
450 static void refill_work(struct work_struct
*work
)
452 struct virtnet_info
*vi
;
455 vi
= container_of(work
, struct virtnet_info
, refill
.work
);
456 napi_disable(&vi
->napi
);
457 still_empty
= !try_fill_recv(vi
, GFP_KERNEL
);
458 napi_enable(&vi
->napi
);
460 /* In theory, this can happen: if we don't get any buffers in
461 * we will *never* try to fill again. */
463 schedule_delayed_work(&vi
->refill
, HZ
/2);
466 static int virtnet_poll(struct napi_struct
*napi
, int budget
)
468 struct virtnet_info
*vi
= container_of(napi
, struct virtnet_info
, napi
);
470 unsigned int len
, received
= 0;
473 while (received
< budget
&&
474 (buf
= vi
->rvq
->vq_ops
->get_buf(vi
->rvq
, &len
)) != NULL
) {
475 receive_buf(vi
->dev
, buf
, len
);
480 if (vi
->num
< vi
->max
/ 2) {
481 if (!try_fill_recv(vi
, GFP_ATOMIC
))
482 schedule_delayed_work(&vi
->refill
, 0);
485 /* Out of packets? */
486 if (received
< budget
) {
488 if (unlikely(!vi
->rvq
->vq_ops
->enable_cb(vi
->rvq
)) &&
489 napi_schedule_prep(napi
)) {
490 vi
->rvq
->vq_ops
->disable_cb(vi
->rvq
);
491 __napi_schedule(napi
);
499 static unsigned int free_old_xmit_skbs(struct virtnet_info
*vi
)
502 unsigned int len
, tot_sgs
= 0;
504 while ((skb
= vi
->svq
->vq_ops
->get_buf(vi
->svq
, &len
)) != NULL
) {
505 pr_debug("Sent skb %p\n", skb
);
506 vi
->dev
->stats
.tx_bytes
+= skb
->len
;
507 vi
->dev
->stats
.tx_packets
++;
508 tot_sgs
+= skb_vnet_hdr(skb
)->num_sg
;
509 dev_kfree_skb_any(skb
);
514 static int xmit_skb(struct virtnet_info
*vi
, struct sk_buff
*skb
)
516 struct scatterlist sg
[2+MAX_SKB_FRAGS
];
517 struct skb_vnet_hdr
*hdr
= skb_vnet_hdr(skb
);
518 const unsigned char *dest
= ((struct ethhdr
*)skb
->data
)->h_dest
;
520 sg_init_table(sg
, 2+MAX_SKB_FRAGS
);
522 pr_debug("%s: xmit %p %pM\n", vi
->dev
->name
, skb
, dest
);
524 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
525 hdr
->hdr
.flags
= VIRTIO_NET_HDR_F_NEEDS_CSUM
;
526 hdr
->hdr
.csum_start
= skb
->csum_start
- skb_headroom(skb
);
527 hdr
->hdr
.csum_offset
= skb
->csum_offset
;
530 hdr
->hdr
.csum_offset
= hdr
->hdr
.csum_start
= 0;
533 if (skb_is_gso(skb
)) {
534 hdr
->hdr
.hdr_len
= skb_headlen(skb
);
535 hdr
->hdr
.gso_size
= skb_shinfo(skb
)->gso_size
;
536 if (skb_shinfo(skb
)->gso_type
& SKB_GSO_TCPV4
)
537 hdr
->hdr
.gso_type
= VIRTIO_NET_HDR_GSO_TCPV4
;
538 else if (skb_shinfo(skb
)->gso_type
& SKB_GSO_TCPV6
)
539 hdr
->hdr
.gso_type
= VIRTIO_NET_HDR_GSO_TCPV6
;
540 else if (skb_shinfo(skb
)->gso_type
& SKB_GSO_UDP
)
541 hdr
->hdr
.gso_type
= VIRTIO_NET_HDR_GSO_UDP
;
544 if (skb_shinfo(skb
)->gso_type
& SKB_GSO_TCP_ECN
)
545 hdr
->hdr
.gso_type
|= VIRTIO_NET_HDR_GSO_ECN
;
547 hdr
->hdr
.gso_type
= VIRTIO_NET_HDR_GSO_NONE
;
548 hdr
->hdr
.gso_size
= hdr
->hdr
.hdr_len
= 0;
551 hdr
->mhdr
.num_buffers
= 0;
553 /* Encode metadata header at front. */
554 if (vi
->mergeable_rx_bufs
)
555 sg_set_buf(sg
, &hdr
->mhdr
, sizeof hdr
->mhdr
);
557 sg_set_buf(sg
, &hdr
->hdr
, sizeof hdr
->hdr
);
559 hdr
->num_sg
= skb_to_sgvec(skb
, sg
+1, 0, skb
->len
) + 1;
560 return vi
->svq
->vq_ops
->add_buf(vi
->svq
, sg
, hdr
->num_sg
, 0, skb
);
563 static netdev_tx_t
start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
565 struct virtnet_info
*vi
= netdev_priv(dev
);
569 /* Free up any pending old buffers before queueing new ones. */
570 free_old_xmit_skbs(vi
);
572 /* Try to transmit */
573 capacity
= xmit_skb(vi
, skb
);
575 /* This can happen with OOM and indirect buffers. */
576 if (unlikely(capacity
< 0)) {
577 netif_stop_queue(dev
);
578 dev_warn(&dev
->dev
, "Unexpected full queue\n");
579 if (unlikely(!vi
->svq
->vq_ops
->enable_cb(vi
->svq
))) {
580 vi
->svq
->vq_ops
->disable_cb(vi
->svq
);
581 netif_start_queue(dev
);
584 return NETDEV_TX_BUSY
;
586 vi
->svq
->vq_ops
->kick(vi
->svq
);
588 /* Don't wait up for transmitted skbs to be freed. */
592 /* Apparently nice girls don't return TX_BUSY; stop the queue
593 * before it gets out of hand. Naturally, this wastes entries. */
594 if (capacity
< 2+MAX_SKB_FRAGS
) {
595 netif_stop_queue(dev
);
596 if (unlikely(!vi
->svq
->vq_ops
->enable_cb(vi
->svq
))) {
597 /* More just got used, free them then recheck. */
598 capacity
+= free_old_xmit_skbs(vi
);
599 if (capacity
>= 2+MAX_SKB_FRAGS
) {
600 netif_start_queue(dev
);
601 vi
->svq
->vq_ops
->disable_cb(vi
->svq
);
609 static int virtnet_set_mac_address(struct net_device
*dev
, void *p
)
611 struct virtnet_info
*vi
= netdev_priv(dev
);
612 struct virtio_device
*vdev
= vi
->vdev
;
615 ret
= eth_mac_addr(dev
, p
);
619 if (virtio_has_feature(vdev
, VIRTIO_NET_F_MAC
))
620 vdev
->config
->set(vdev
, offsetof(struct virtio_net_config
, mac
),
621 dev
->dev_addr
, dev
->addr_len
);
626 #ifdef CONFIG_NET_POLL_CONTROLLER
627 static void virtnet_netpoll(struct net_device
*dev
)
629 struct virtnet_info
*vi
= netdev_priv(dev
);
631 napi_schedule(&vi
->napi
);
635 static int virtnet_open(struct net_device
*dev
)
637 struct virtnet_info
*vi
= netdev_priv(dev
);
639 napi_enable(&vi
->napi
);
641 /* If all buffers were filled by other side before we napi_enabled, we
642 * won't get another interrupt, so process any outstanding packets
643 * now. virtnet_poll wants re-enable the queue, so we disable here.
644 * We synchronize against interrupts via NAPI_STATE_SCHED */
645 if (napi_schedule_prep(&vi
->napi
)) {
646 vi
->rvq
->vq_ops
->disable_cb(vi
->rvq
);
647 __napi_schedule(&vi
->napi
);
653 * Send command via the control virtqueue and check status. Commands
654 * supported by the hypervisor, as indicated by feature bits, should
655 * never fail unless improperly formated.
657 static bool virtnet_send_command(struct virtnet_info
*vi
, u8
class, u8 cmd
,
658 struct scatterlist
*data
, int out
, int in
)
660 struct scatterlist
*s
, sg
[VIRTNET_SEND_COMMAND_SG_MAX
+ 2];
661 struct virtio_net_ctrl_hdr ctrl
;
662 virtio_net_ctrl_ack status
= ~0;
666 /* Caller should know better */
667 BUG_ON(!virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_VQ
) ||
668 (out
+ in
> VIRTNET_SEND_COMMAND_SG_MAX
));
670 out
++; /* Add header */
671 in
++; /* Add return status */
676 sg_init_table(sg
, out
+ in
);
678 sg_set_buf(&sg
[0], &ctrl
, sizeof(ctrl
));
679 for_each_sg(data
, s
, out
+ in
- 2, i
)
680 sg_set_buf(&sg
[i
+ 1], sg_virt(s
), s
->length
);
681 sg_set_buf(&sg
[out
+ in
- 1], &status
, sizeof(status
));
683 BUG_ON(vi
->cvq
->vq_ops
->add_buf(vi
->cvq
, sg
, out
, in
, vi
) < 0);
685 vi
->cvq
->vq_ops
->kick(vi
->cvq
);
688 * Spin for a response, the kick causes an ioport write, trapping
689 * into the hypervisor, so the request should be handled immediately.
691 while (!vi
->cvq
->vq_ops
->get_buf(vi
->cvq
, &tmp
))
694 return status
== VIRTIO_NET_OK
;
697 static int virtnet_close(struct net_device
*dev
)
699 struct virtnet_info
*vi
= netdev_priv(dev
);
701 napi_disable(&vi
->napi
);
706 static int virtnet_set_tx_csum(struct net_device
*dev
, u32 data
)
708 struct virtnet_info
*vi
= netdev_priv(dev
);
709 struct virtio_device
*vdev
= vi
->vdev
;
711 if (data
&& !virtio_has_feature(vdev
, VIRTIO_NET_F_CSUM
))
714 return ethtool_op_set_tx_hw_csum(dev
, data
);
717 static void virtnet_set_rx_mode(struct net_device
*dev
)
719 struct virtnet_info
*vi
= netdev_priv(dev
);
720 struct scatterlist sg
[2];
721 u8 promisc
, allmulti
;
722 struct virtio_net_ctrl_mac
*mac_data
;
723 struct dev_addr_list
*addr
;
724 struct netdev_hw_addr
*ha
;
730 /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */
731 if (!virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_RX
))
734 promisc
= ((dev
->flags
& IFF_PROMISC
) != 0);
735 allmulti
= ((dev
->flags
& IFF_ALLMULTI
) != 0);
737 sg_init_one(sg
, &promisc
, sizeof(promisc
));
739 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_RX
,
740 VIRTIO_NET_CTRL_RX_PROMISC
,
742 dev_warn(&dev
->dev
, "Failed to %sable promisc mode.\n",
743 promisc
? "en" : "dis");
745 sg_init_one(sg
, &allmulti
, sizeof(allmulti
));
747 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_RX
,
748 VIRTIO_NET_CTRL_RX_ALLMULTI
,
750 dev_warn(&dev
->dev
, "Failed to %sable allmulti mode.\n",
751 allmulti
? "en" : "dis");
753 uc_count
= netdev_uc_count(dev
);
754 mc_count
= netdev_mc_count(dev
);
755 /* MAC filter - use one buffer for both lists */
756 buf
= kzalloc(((uc_count
+ mc_count
) * ETH_ALEN
) +
757 (2 * sizeof(mac_data
->entries
)), GFP_ATOMIC
);
760 dev_warn(&dev
->dev
, "No memory for MAC address buffer\n");
764 sg_init_table(sg
, 2);
766 /* Store the unicast list and count in the front of the buffer */
767 mac_data
->entries
= uc_count
;
769 netdev_for_each_uc_addr(ha
, dev
)
770 memcpy(&mac_data
->macs
[i
++][0], ha
->addr
, ETH_ALEN
);
772 sg_set_buf(&sg
[0], mac_data
,
773 sizeof(mac_data
->entries
) + (uc_count
* ETH_ALEN
));
775 /* multicast list and count fill the end */
776 mac_data
= (void *)&mac_data
->macs
[uc_count
][0];
778 mac_data
->entries
= mc_count
;
780 netdev_for_each_mc_addr(addr
, dev
)
781 memcpy(&mac_data
->macs
[i
++][0], addr
->da_addr
, ETH_ALEN
);
783 sg_set_buf(&sg
[1], mac_data
,
784 sizeof(mac_data
->entries
) + (mc_count
* ETH_ALEN
));
786 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_MAC
,
787 VIRTIO_NET_CTRL_MAC_TABLE_SET
,
789 dev_warn(&dev
->dev
, "Failed to set MAC fitler table.\n");
794 static void virtnet_vlan_rx_add_vid(struct net_device
*dev
, u16 vid
)
796 struct virtnet_info
*vi
= netdev_priv(dev
);
797 struct scatterlist sg
;
799 sg_init_one(&sg
, &vid
, sizeof(vid
));
801 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_VLAN
,
802 VIRTIO_NET_CTRL_VLAN_ADD
, &sg
, 1, 0))
803 dev_warn(&dev
->dev
, "Failed to add VLAN ID %d.\n", vid
);
806 static void virtnet_vlan_rx_kill_vid(struct net_device
*dev
, u16 vid
)
808 struct virtnet_info
*vi
= netdev_priv(dev
);
809 struct scatterlist sg
;
811 sg_init_one(&sg
, &vid
, sizeof(vid
));
813 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_VLAN
,
814 VIRTIO_NET_CTRL_VLAN_DEL
, &sg
, 1, 0))
815 dev_warn(&dev
->dev
, "Failed to kill VLAN ID %d.\n", vid
);
818 static const struct ethtool_ops virtnet_ethtool_ops
= {
819 .set_tx_csum
= virtnet_set_tx_csum
,
820 .set_sg
= ethtool_op_set_sg
,
821 .set_tso
= ethtool_op_set_tso
,
822 .set_ufo
= ethtool_op_set_ufo
,
823 .get_link
= ethtool_op_get_link
,
827 #define MAX_MTU 65535
829 static int virtnet_change_mtu(struct net_device
*dev
, int new_mtu
)
831 if (new_mtu
< MIN_MTU
|| new_mtu
> MAX_MTU
)
837 static const struct net_device_ops virtnet_netdev
= {
838 .ndo_open
= virtnet_open
,
839 .ndo_stop
= virtnet_close
,
840 .ndo_start_xmit
= start_xmit
,
841 .ndo_validate_addr
= eth_validate_addr
,
842 .ndo_set_mac_address
= virtnet_set_mac_address
,
843 .ndo_set_rx_mode
= virtnet_set_rx_mode
,
844 .ndo_change_mtu
= virtnet_change_mtu
,
845 .ndo_vlan_rx_add_vid
= virtnet_vlan_rx_add_vid
,
846 .ndo_vlan_rx_kill_vid
= virtnet_vlan_rx_kill_vid
,
847 #ifdef CONFIG_NET_POLL_CONTROLLER
848 .ndo_poll_controller
= virtnet_netpoll
,
852 static void virtnet_update_status(struct virtnet_info
*vi
)
856 if (!virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_STATUS
))
859 vi
->vdev
->config
->get(vi
->vdev
,
860 offsetof(struct virtio_net_config
, status
),
863 /* Ignore unknown (future) status bits */
864 v
&= VIRTIO_NET_S_LINK_UP
;
871 if (vi
->status
& VIRTIO_NET_S_LINK_UP
) {
872 netif_carrier_on(vi
->dev
);
873 netif_wake_queue(vi
->dev
);
875 netif_carrier_off(vi
->dev
);
876 netif_stop_queue(vi
->dev
);
880 static void virtnet_config_changed(struct virtio_device
*vdev
)
882 struct virtnet_info
*vi
= vdev
->priv
;
884 virtnet_update_status(vi
);
887 static int virtnet_probe(struct virtio_device
*vdev
)
890 struct net_device
*dev
;
891 struct virtnet_info
*vi
;
892 struct virtqueue
*vqs
[3];
893 vq_callback_t
*callbacks
[] = { skb_recv_done
, skb_xmit_done
, NULL
};
894 const char *names
[] = { "input", "output", "control" };
897 /* Allocate ourselves a network device with room for our info */
898 dev
= alloc_etherdev(sizeof(struct virtnet_info
));
902 /* Set up network device as normal. */
903 dev
->netdev_ops
= &virtnet_netdev
;
904 dev
->features
= NETIF_F_HIGHDMA
;
905 SET_ETHTOOL_OPS(dev
, &virtnet_ethtool_ops
);
906 SET_NETDEV_DEV(dev
, &vdev
->dev
);
908 /* Do we support "hardware" checksums? */
909 if (csum
&& virtio_has_feature(vdev
, VIRTIO_NET_F_CSUM
)) {
910 /* This opens up the world of extra features. */
911 dev
->features
|= NETIF_F_HW_CSUM
|NETIF_F_SG
|NETIF_F_FRAGLIST
;
912 if (gso
&& virtio_has_feature(vdev
, VIRTIO_NET_F_GSO
)) {
913 dev
->features
|= NETIF_F_TSO
| NETIF_F_UFO
914 | NETIF_F_TSO_ECN
| NETIF_F_TSO6
;
916 /* Individual feature bits: what can host handle? */
917 if (gso
&& virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_TSO4
))
918 dev
->features
|= NETIF_F_TSO
;
919 if (gso
&& virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_TSO6
))
920 dev
->features
|= NETIF_F_TSO6
;
921 if (gso
&& virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_ECN
))
922 dev
->features
|= NETIF_F_TSO_ECN
;
923 if (gso
&& virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_UFO
))
924 dev
->features
|= NETIF_F_UFO
;
927 /* Configuration may specify what MAC to use. Otherwise random. */
928 if (virtio_has_feature(vdev
, VIRTIO_NET_F_MAC
)) {
929 vdev
->config
->get(vdev
,
930 offsetof(struct virtio_net_config
, mac
),
931 dev
->dev_addr
, dev
->addr_len
);
933 random_ether_addr(dev
->dev_addr
);
935 /* Set up our device-specific information */
936 vi
= netdev_priv(dev
);
937 netif_napi_add(dev
, &vi
->napi
, virtnet_poll
, napi_weight
);
942 INIT_DELAYED_WORK(&vi
->refill
, refill_work
);
944 /* If we can receive ANY GSO packets, we must allocate large ones. */
945 if (virtio_has_feature(vdev
, VIRTIO_NET_F_GUEST_TSO4
) ||
946 virtio_has_feature(vdev
, VIRTIO_NET_F_GUEST_TSO6
) ||
947 virtio_has_feature(vdev
, VIRTIO_NET_F_GUEST_ECN
))
948 vi
->big_packets
= true;
950 if (virtio_has_feature(vdev
, VIRTIO_NET_F_MRG_RXBUF
))
951 vi
->mergeable_rx_bufs
= true;
953 /* We expect two virtqueues, receive then send,
954 * and optionally control. */
955 nvqs
= virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_VQ
) ? 3 : 2;
957 err
= vdev
->config
->find_vqs(vdev
, nvqs
, vqs
, callbacks
, names
);
964 if (virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_VQ
)) {
967 if (virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_VLAN
))
968 dev
->features
|= NETIF_F_HW_VLAN_FILTER
;
971 err
= register_netdev(dev
);
973 pr_debug("virtio_net: registering device failed\n");
977 /* Last of all, set up some receive buffers. */
978 try_fill_recv(vi
, GFP_KERNEL
);
980 /* If we didn't even get one input buffer, we're useless. */
986 vi
->status
= VIRTIO_NET_S_LINK_UP
;
987 virtnet_update_status(vi
);
988 netif_carrier_on(dev
);
990 pr_debug("virtnet: registered device %s\n", dev
->name
);
994 unregister_netdev(dev
);
995 cancel_delayed_work_sync(&vi
->refill
);
997 vdev
->config
->del_vqs(vdev
);
1003 static void free_unused_bufs(struct virtnet_info
*vi
)
1007 buf
= vi
->svq
->vq_ops
->detach_unused_buf(vi
->svq
);
1013 buf
= vi
->rvq
->vq_ops
->detach_unused_buf(vi
->rvq
);
1016 if (vi
->mergeable_rx_bufs
|| vi
->big_packets
)
1017 give_pages(vi
, buf
);
1022 BUG_ON(vi
->num
!= 0);
1025 static void __devexit
virtnet_remove(struct virtio_device
*vdev
)
1027 struct virtnet_info
*vi
= vdev
->priv
;
1029 /* Stop all the virtqueues. */
1030 vdev
->config
->reset(vdev
);
1033 unregister_netdev(vi
->dev
);
1034 cancel_delayed_work_sync(&vi
->refill
);
1036 /* Free unused buffers in both send and recv, if any. */
1037 free_unused_bufs(vi
);
1039 vdev
->config
->del_vqs(vi
->vdev
);
1042 __free_pages(get_a_page(vi
, GFP_KERNEL
), 0);
1044 free_netdev(vi
->dev
);
1047 static struct virtio_device_id id_table
[] = {
1048 { VIRTIO_ID_NET
, VIRTIO_DEV_ANY_ID
},
1052 static unsigned int features
[] = {
1053 VIRTIO_NET_F_CSUM
, VIRTIO_NET_F_GUEST_CSUM
,
1054 VIRTIO_NET_F_GSO
, VIRTIO_NET_F_MAC
,
1055 VIRTIO_NET_F_HOST_TSO4
, VIRTIO_NET_F_HOST_UFO
, VIRTIO_NET_F_HOST_TSO6
,
1056 VIRTIO_NET_F_HOST_ECN
, VIRTIO_NET_F_GUEST_TSO4
, VIRTIO_NET_F_GUEST_TSO6
,
1057 VIRTIO_NET_F_GUEST_ECN
, VIRTIO_NET_F_GUEST_UFO
,
1058 VIRTIO_NET_F_MRG_RXBUF
, VIRTIO_NET_F_STATUS
, VIRTIO_NET_F_CTRL_VQ
,
1059 VIRTIO_NET_F_CTRL_RX
, VIRTIO_NET_F_CTRL_VLAN
,
1062 static struct virtio_driver virtio_net_driver
= {
1063 .feature_table
= features
,
1064 .feature_table_size
= ARRAY_SIZE(features
),
1065 .driver
.name
= KBUILD_MODNAME
,
1066 .driver
.owner
= THIS_MODULE
,
1067 .id_table
= id_table
,
1068 .probe
= virtnet_probe
,
1069 .remove
= __devexit_p(virtnet_remove
),
1070 .config_changed
= virtnet_config_changed
,
1073 static int __init
init(void)
1075 return register_virtio_driver(&virtio_net_driver
);
1078 static void __exit
fini(void)
1080 unregister_virtio_driver(&virtio_net_driver
);
1085 MODULE_DEVICE_TABLE(virtio
, id_table
);
1086 MODULE_DESCRIPTION("Virtio network driver");
1087 MODULE_LICENSE("GPL");