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
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 /* Work struct for refilling if we run low on memory. */
60 struct delayed_work refill
;
62 /* Chain pages by the private ptr. */
65 /* fragments + linear part + virtio header */
66 struct scatterlist rx_sg
[MAX_SKB_FRAGS
+ 2];
67 struct scatterlist tx_sg
[MAX_SKB_FRAGS
+ 2];
72 struct virtio_net_hdr hdr
;
73 struct virtio_net_hdr_mrg_rxbuf mhdr
;
78 struct padded_vnet_hdr
{
79 struct virtio_net_hdr hdr
;
81 * virtio_net_hdr should be in a separated sg buffer because of a
82 * QEMU bug, and data sg buffer shares same page with this header sg.
83 * This padding makes next sg 16 byte aligned after virtio_net_hdr.
88 static inline struct skb_vnet_hdr
*skb_vnet_hdr(struct sk_buff
*skb
)
90 return (struct skb_vnet_hdr
*)skb
->cb
;
94 * private is used to chain pages for big packets, put the whole
95 * most recent used list in the beginning for reuse
97 static void give_pages(struct virtnet_info
*vi
, struct page
*page
)
101 /* Find end of list, sew whole thing into vi->pages. */
102 for (end
= page
; end
->private; end
= (struct page
*)end
->private);
103 end
->private = (unsigned long)vi
->pages
;
107 static struct page
*get_a_page(struct virtnet_info
*vi
, gfp_t gfp_mask
)
109 struct page
*p
= vi
->pages
;
112 vi
->pages
= (struct page
*)p
->private;
113 /* clear private here, it is used to chain pages */
116 p
= alloc_page(gfp_mask
);
120 static void skb_xmit_done(struct virtqueue
*svq
)
122 struct virtnet_info
*vi
= svq
->vdev
->priv
;
124 /* Suppress further interrupts. */
125 svq
->vq_ops
->disable_cb(svq
);
127 /* We were probably waiting for more output buffers. */
128 netif_wake_queue(vi
->dev
);
131 static void set_skb_frag(struct sk_buff
*skb
, struct page
*page
,
132 unsigned int offset
, unsigned int *len
)
134 int i
= skb_shinfo(skb
)->nr_frags
;
137 f
= &skb_shinfo(skb
)->frags
[i
];
138 f
->size
= min((unsigned)PAGE_SIZE
- offset
, *len
);
139 f
->page_offset
= offset
;
142 skb
->data_len
+= f
->size
;
144 skb_shinfo(skb
)->nr_frags
++;
148 static struct sk_buff
*page_to_skb(struct virtnet_info
*vi
,
149 struct page
*page
, unsigned int len
)
152 struct skb_vnet_hdr
*hdr
;
153 unsigned int copy
, hdr_len
, offset
;
156 p
= page_address(page
);
158 /* copy small packet so we can reuse these pages for small data */
159 skb
= netdev_alloc_skb_ip_align(vi
->dev
, GOOD_COPY_LEN
);
163 hdr
= skb_vnet_hdr(skb
);
165 if (vi
->mergeable_rx_bufs
) {
166 hdr_len
= sizeof hdr
->mhdr
;
169 hdr_len
= sizeof hdr
->hdr
;
170 offset
= sizeof(struct padded_vnet_hdr
);
173 memcpy(hdr
, p
, hdr_len
);
179 if (copy
> skb_tailroom(skb
))
180 copy
= skb_tailroom(skb
);
181 memcpy(skb_put(skb
, copy
), p
, copy
);
187 set_skb_frag(skb
, page
, offset
, &len
);
188 page
= (struct page
*)page
->private;
193 give_pages(vi
, page
);
198 static int receive_mergeable(struct virtnet_info
*vi
, struct sk_buff
*skb
)
200 struct skb_vnet_hdr
*hdr
= skb_vnet_hdr(skb
);
204 num_buf
= hdr
->mhdr
.num_buffers
;
206 i
= skb_shinfo(skb
)->nr_frags
;
207 if (i
>= MAX_SKB_FRAGS
) {
208 pr_debug("%s: packet too long\n", skb
->dev
->name
);
209 skb
->dev
->stats
.rx_length_errors
++;
213 page
= vi
->rvq
->vq_ops
->get_buf(vi
->rvq
, &len
);
215 pr_debug("%s: rx error: %d buffers missing\n",
216 skb
->dev
->name
, hdr
->mhdr
.num_buffers
);
217 skb
->dev
->stats
.rx_length_errors
++;
223 set_skb_frag(skb
, page
, 0, &len
);
230 static void receive_buf(struct net_device
*dev
, void *buf
, unsigned int len
)
232 struct virtnet_info
*vi
= netdev_priv(dev
);
235 struct skb_vnet_hdr
*hdr
;
237 if (unlikely(len
< sizeof(struct virtio_net_hdr
) + ETH_HLEN
)) {
238 pr_debug("%s: short packet %i\n", dev
->name
, len
);
239 dev
->stats
.rx_length_errors
++;
240 if (vi
->mergeable_rx_bufs
|| vi
->big_packets
)
247 if (!vi
->mergeable_rx_bufs
&& !vi
->big_packets
) {
249 len
-= sizeof(struct virtio_net_hdr
);
253 skb
= page_to_skb(vi
, page
, len
);
254 if (unlikely(!skb
)) {
255 dev
->stats
.rx_dropped
++;
256 give_pages(vi
, page
);
259 if (vi
->mergeable_rx_bufs
)
260 if (receive_mergeable(vi
, skb
)) {
266 hdr
= skb_vnet_hdr(skb
);
267 skb
->truesize
+= skb
->data_len
;
268 dev
->stats
.rx_bytes
+= skb
->len
;
269 dev
->stats
.rx_packets
++;
271 if (hdr
->hdr
.flags
& VIRTIO_NET_HDR_F_NEEDS_CSUM
) {
272 pr_debug("Needs csum!\n");
273 if (!skb_partial_csum_set(skb
,
275 hdr
->hdr
.csum_offset
))
279 skb
->protocol
= eth_type_trans(skb
, dev
);
280 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
281 ntohs(skb
->protocol
), skb
->len
, skb
->pkt_type
);
283 if (hdr
->hdr
.gso_type
!= VIRTIO_NET_HDR_GSO_NONE
) {
285 switch (hdr
->hdr
.gso_type
& ~VIRTIO_NET_HDR_GSO_ECN
) {
286 case VIRTIO_NET_HDR_GSO_TCPV4
:
287 skb_shinfo(skb
)->gso_type
= SKB_GSO_TCPV4
;
289 case VIRTIO_NET_HDR_GSO_UDP
:
290 skb_shinfo(skb
)->gso_type
= SKB_GSO_UDP
;
292 case VIRTIO_NET_HDR_GSO_TCPV6
:
293 skb_shinfo(skb
)->gso_type
= SKB_GSO_TCPV6
;
297 printk(KERN_WARNING
"%s: bad gso type %u.\n",
298 dev
->name
, hdr
->hdr
.gso_type
);
302 if (hdr
->hdr
.gso_type
& VIRTIO_NET_HDR_GSO_ECN
)
303 skb_shinfo(skb
)->gso_type
|= SKB_GSO_TCP_ECN
;
305 skb_shinfo(skb
)->gso_size
= hdr
->hdr
.gso_size
;
306 if (skb_shinfo(skb
)->gso_size
== 0) {
308 printk(KERN_WARNING
"%s: zero gso size.\n",
313 /* Header must be checked, and gso_segs computed. */
314 skb_shinfo(skb
)->gso_type
|= SKB_GSO_DODGY
;
315 skb_shinfo(skb
)->gso_segs
= 0;
318 netif_receive_skb(skb
);
322 dev
->stats
.rx_frame_errors
++;
326 static int add_recvbuf_small(struct virtnet_info
*vi
, gfp_t gfp
)
329 struct skb_vnet_hdr
*hdr
;
332 skb
= netdev_alloc_skb_ip_align(vi
->dev
, MAX_PACKET_LEN
);
336 skb_put(skb
, MAX_PACKET_LEN
);
338 hdr
= skb_vnet_hdr(skb
);
339 sg_set_buf(vi
->rx_sg
, &hdr
->hdr
, sizeof hdr
->hdr
);
341 skb_to_sgvec(skb
, vi
->rx_sg
+ 1, 0, skb
->len
);
343 err
= vi
->rvq
->vq_ops
->add_buf(vi
->rvq
, vi
->rx_sg
, 0, 2, skb
);
350 static int add_recvbuf_big(struct virtnet_info
*vi
, gfp_t gfp
)
352 struct page
*first
, *list
= NULL
;
356 /* page in vi->rx_sg[MAX_SKB_FRAGS + 1] is list tail */
357 for (i
= MAX_SKB_FRAGS
+ 1; i
> 1; --i
) {
358 first
= get_a_page(vi
, gfp
);
361 give_pages(vi
, list
);
364 sg_set_buf(&vi
->rx_sg
[i
], page_address(first
), PAGE_SIZE
);
366 /* chain new page in list head to match sg */
367 first
->private = (unsigned long)list
;
371 first
= get_a_page(vi
, gfp
);
373 give_pages(vi
, list
);
376 p
= page_address(first
);
378 /* vi->rx_sg[0], vi->rx_sg[1] share the same page */
379 /* a separated vi->rx_sg[0] for virtio_net_hdr only due to QEMU bug */
380 sg_set_buf(&vi
->rx_sg
[0], p
, sizeof(struct virtio_net_hdr
));
382 /* vi->rx_sg[1] for data packet, from offset */
383 offset
= sizeof(struct padded_vnet_hdr
);
384 sg_set_buf(&vi
->rx_sg
[1], p
+ offset
, PAGE_SIZE
- offset
);
386 /* chain first in list head */
387 first
->private = (unsigned long)list
;
388 err
= vi
->rvq
->vq_ops
->add_buf(vi
->rvq
, vi
->rx_sg
, 0, MAX_SKB_FRAGS
+ 2,
391 give_pages(vi
, first
);
396 static int add_recvbuf_mergeable(struct virtnet_info
*vi
, gfp_t gfp
)
401 page
= get_a_page(vi
, gfp
);
405 sg_init_one(vi
->rx_sg
, page_address(page
), PAGE_SIZE
);
407 err
= vi
->rvq
->vq_ops
->add_buf(vi
->rvq
, vi
->rx_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 skb_vnet_hdr
*hdr
= skb_vnet_hdr(skb
);
517 const unsigned char *dest
= ((struct ethhdr
*)skb
->data
)->h_dest
;
519 pr_debug("%s: xmit %p %pM\n", vi
->dev
->name
, skb
, dest
);
521 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
522 hdr
->hdr
.flags
= VIRTIO_NET_HDR_F_NEEDS_CSUM
;
523 hdr
->hdr
.csum_start
= skb
->csum_start
- skb_headroom(skb
);
524 hdr
->hdr
.csum_offset
= skb
->csum_offset
;
527 hdr
->hdr
.csum_offset
= hdr
->hdr
.csum_start
= 0;
530 if (skb_is_gso(skb
)) {
531 hdr
->hdr
.hdr_len
= skb_headlen(skb
);
532 hdr
->hdr
.gso_size
= skb_shinfo(skb
)->gso_size
;
533 if (skb_shinfo(skb
)->gso_type
& SKB_GSO_TCPV4
)
534 hdr
->hdr
.gso_type
= VIRTIO_NET_HDR_GSO_TCPV4
;
535 else if (skb_shinfo(skb
)->gso_type
& SKB_GSO_TCPV6
)
536 hdr
->hdr
.gso_type
= VIRTIO_NET_HDR_GSO_TCPV6
;
537 else if (skb_shinfo(skb
)->gso_type
& SKB_GSO_UDP
)
538 hdr
->hdr
.gso_type
= VIRTIO_NET_HDR_GSO_UDP
;
541 if (skb_shinfo(skb
)->gso_type
& SKB_GSO_TCP_ECN
)
542 hdr
->hdr
.gso_type
|= VIRTIO_NET_HDR_GSO_ECN
;
544 hdr
->hdr
.gso_type
= VIRTIO_NET_HDR_GSO_NONE
;
545 hdr
->hdr
.gso_size
= hdr
->hdr
.hdr_len
= 0;
548 hdr
->mhdr
.num_buffers
= 0;
550 /* Encode metadata header at front. */
551 if (vi
->mergeable_rx_bufs
)
552 sg_set_buf(vi
->tx_sg
, &hdr
->mhdr
, sizeof hdr
->mhdr
);
554 sg_set_buf(vi
->tx_sg
, &hdr
->hdr
, sizeof hdr
->hdr
);
556 hdr
->num_sg
= skb_to_sgvec(skb
, vi
->tx_sg
+ 1, 0, skb
->len
) + 1;
557 return vi
->svq
->vq_ops
->add_buf(vi
->svq
, vi
->tx_sg
, hdr
->num_sg
,
561 static netdev_tx_t
start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
563 struct virtnet_info
*vi
= netdev_priv(dev
);
567 /* Free up any pending old buffers before queueing new ones. */
568 free_old_xmit_skbs(vi
);
570 /* Try to transmit */
571 capacity
= xmit_skb(vi
, skb
);
573 /* This can happen with OOM and indirect buffers. */
574 if (unlikely(capacity
< 0)) {
575 netif_stop_queue(dev
);
576 dev_warn(&dev
->dev
, "Unexpected full queue\n");
577 if (unlikely(!vi
->svq
->vq_ops
->enable_cb(vi
->svq
))) {
578 vi
->svq
->vq_ops
->disable_cb(vi
->svq
);
579 netif_start_queue(dev
);
582 return NETDEV_TX_BUSY
;
584 vi
->svq
->vq_ops
->kick(vi
->svq
);
586 /* Don't wait up for transmitted skbs to be freed. */
590 /* Apparently nice girls don't return TX_BUSY; stop the queue
591 * before it gets out of hand. Naturally, this wastes entries. */
592 if (capacity
< 2+MAX_SKB_FRAGS
) {
593 netif_stop_queue(dev
);
594 if (unlikely(!vi
->svq
->vq_ops
->enable_cb(vi
->svq
))) {
595 /* More just got used, free them then recheck. */
596 capacity
+= free_old_xmit_skbs(vi
);
597 if (capacity
>= 2+MAX_SKB_FRAGS
) {
598 netif_start_queue(dev
);
599 vi
->svq
->vq_ops
->disable_cb(vi
->svq
);
607 static int virtnet_set_mac_address(struct net_device
*dev
, void *p
)
609 struct virtnet_info
*vi
= netdev_priv(dev
);
610 struct virtio_device
*vdev
= vi
->vdev
;
613 ret
= eth_mac_addr(dev
, p
);
617 if (virtio_has_feature(vdev
, VIRTIO_NET_F_MAC
))
618 vdev
->config
->set(vdev
, offsetof(struct virtio_net_config
, mac
),
619 dev
->dev_addr
, dev
->addr_len
);
624 #ifdef CONFIG_NET_POLL_CONTROLLER
625 static void virtnet_netpoll(struct net_device
*dev
)
627 struct virtnet_info
*vi
= netdev_priv(dev
);
629 napi_schedule(&vi
->napi
);
633 static int virtnet_open(struct net_device
*dev
)
635 struct virtnet_info
*vi
= netdev_priv(dev
);
637 napi_enable(&vi
->napi
);
639 /* If all buffers were filled by other side before we napi_enabled, we
640 * won't get another interrupt, so process any outstanding packets
641 * now. virtnet_poll wants re-enable the queue, so we disable here.
642 * We synchronize against interrupts via NAPI_STATE_SCHED */
643 if (napi_schedule_prep(&vi
->napi
)) {
644 vi
->rvq
->vq_ops
->disable_cb(vi
->rvq
);
645 __napi_schedule(&vi
->napi
);
651 * Send command via the control virtqueue and check status. Commands
652 * supported by the hypervisor, as indicated by feature bits, should
653 * never fail unless improperly formated.
655 static bool virtnet_send_command(struct virtnet_info
*vi
, u8
class, u8 cmd
,
656 struct scatterlist
*data
, int out
, int in
)
658 struct scatterlist
*s
, sg
[VIRTNET_SEND_COMMAND_SG_MAX
+ 2];
659 struct virtio_net_ctrl_hdr ctrl
;
660 virtio_net_ctrl_ack status
= ~0;
664 /* Caller should know better */
665 BUG_ON(!virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_VQ
) ||
666 (out
+ in
> VIRTNET_SEND_COMMAND_SG_MAX
));
668 out
++; /* Add header */
669 in
++; /* Add return status */
674 sg_init_table(sg
, out
+ in
);
676 sg_set_buf(&sg
[0], &ctrl
, sizeof(ctrl
));
677 for_each_sg(data
, s
, out
+ in
- 2, i
)
678 sg_set_buf(&sg
[i
+ 1], sg_virt(s
), s
->length
);
679 sg_set_buf(&sg
[out
+ in
- 1], &status
, sizeof(status
));
681 BUG_ON(vi
->cvq
->vq_ops
->add_buf(vi
->cvq
, sg
, out
, in
, vi
) < 0);
683 vi
->cvq
->vq_ops
->kick(vi
->cvq
);
686 * Spin for a response, the kick causes an ioport write, trapping
687 * into the hypervisor, so the request should be handled immediately.
689 while (!vi
->cvq
->vq_ops
->get_buf(vi
->cvq
, &tmp
))
692 return status
== VIRTIO_NET_OK
;
695 static int virtnet_close(struct net_device
*dev
)
697 struct virtnet_info
*vi
= netdev_priv(dev
);
699 napi_disable(&vi
->napi
);
704 static int virtnet_set_tx_csum(struct net_device
*dev
, u32 data
)
706 struct virtnet_info
*vi
= netdev_priv(dev
);
707 struct virtio_device
*vdev
= vi
->vdev
;
709 if (data
&& !virtio_has_feature(vdev
, VIRTIO_NET_F_CSUM
))
712 return ethtool_op_set_tx_hw_csum(dev
, data
);
715 static void virtnet_set_rx_mode(struct net_device
*dev
)
717 struct virtnet_info
*vi
= netdev_priv(dev
);
718 struct scatterlist sg
[2];
719 u8 promisc
, allmulti
;
720 struct virtio_net_ctrl_mac
*mac_data
;
721 struct netdev_hw_addr
*ha
;
727 /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */
728 if (!virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_RX
))
731 promisc
= ((dev
->flags
& IFF_PROMISC
) != 0);
732 allmulti
= ((dev
->flags
& IFF_ALLMULTI
) != 0);
734 sg_init_one(sg
, &promisc
, sizeof(promisc
));
736 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_RX
,
737 VIRTIO_NET_CTRL_RX_PROMISC
,
739 dev_warn(&dev
->dev
, "Failed to %sable promisc mode.\n",
740 promisc
? "en" : "dis");
742 sg_init_one(sg
, &allmulti
, sizeof(allmulti
));
744 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_RX
,
745 VIRTIO_NET_CTRL_RX_ALLMULTI
,
747 dev_warn(&dev
->dev
, "Failed to %sable allmulti mode.\n",
748 allmulti
? "en" : "dis");
750 uc_count
= netdev_uc_count(dev
);
751 mc_count
= netdev_mc_count(dev
);
752 /* MAC filter - use one buffer for both lists */
753 buf
= kzalloc(((uc_count
+ mc_count
) * ETH_ALEN
) +
754 (2 * sizeof(mac_data
->entries
)), GFP_ATOMIC
);
757 dev_warn(&dev
->dev
, "No memory for MAC address buffer\n");
761 sg_init_table(sg
, 2);
763 /* Store the unicast list and count in the front of the buffer */
764 mac_data
->entries
= uc_count
;
766 netdev_for_each_uc_addr(ha
, dev
)
767 memcpy(&mac_data
->macs
[i
++][0], ha
->addr
, ETH_ALEN
);
769 sg_set_buf(&sg
[0], mac_data
,
770 sizeof(mac_data
->entries
) + (uc_count
* ETH_ALEN
));
772 /* multicast list and count fill the end */
773 mac_data
= (void *)&mac_data
->macs
[uc_count
][0];
775 mac_data
->entries
= mc_count
;
777 netdev_for_each_mc_addr(ha
, dev
)
778 memcpy(&mac_data
->macs
[i
++][0], ha
->addr
, ETH_ALEN
);
780 sg_set_buf(&sg
[1], mac_data
,
781 sizeof(mac_data
->entries
) + (mc_count
* ETH_ALEN
));
783 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_MAC
,
784 VIRTIO_NET_CTRL_MAC_TABLE_SET
,
786 dev_warn(&dev
->dev
, "Failed to set MAC fitler table.\n");
791 static void virtnet_vlan_rx_add_vid(struct net_device
*dev
, u16 vid
)
793 struct virtnet_info
*vi
= netdev_priv(dev
);
794 struct scatterlist sg
;
796 sg_init_one(&sg
, &vid
, sizeof(vid
));
798 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_VLAN
,
799 VIRTIO_NET_CTRL_VLAN_ADD
, &sg
, 1, 0))
800 dev_warn(&dev
->dev
, "Failed to add VLAN ID %d.\n", vid
);
803 static void virtnet_vlan_rx_kill_vid(struct net_device
*dev
, u16 vid
)
805 struct virtnet_info
*vi
= netdev_priv(dev
);
806 struct scatterlist sg
;
808 sg_init_one(&sg
, &vid
, sizeof(vid
));
810 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_VLAN
,
811 VIRTIO_NET_CTRL_VLAN_DEL
, &sg
, 1, 0))
812 dev_warn(&dev
->dev
, "Failed to kill VLAN ID %d.\n", vid
);
815 static const struct ethtool_ops virtnet_ethtool_ops
= {
816 .set_tx_csum
= virtnet_set_tx_csum
,
817 .set_sg
= ethtool_op_set_sg
,
818 .set_tso
= ethtool_op_set_tso
,
819 .set_ufo
= ethtool_op_set_ufo
,
820 .get_link
= ethtool_op_get_link
,
824 #define MAX_MTU 65535
826 static int virtnet_change_mtu(struct net_device
*dev
, int new_mtu
)
828 if (new_mtu
< MIN_MTU
|| new_mtu
> MAX_MTU
)
834 static const struct net_device_ops virtnet_netdev
= {
835 .ndo_open
= virtnet_open
,
836 .ndo_stop
= virtnet_close
,
837 .ndo_start_xmit
= start_xmit
,
838 .ndo_validate_addr
= eth_validate_addr
,
839 .ndo_set_mac_address
= virtnet_set_mac_address
,
840 .ndo_set_rx_mode
= virtnet_set_rx_mode
,
841 .ndo_change_mtu
= virtnet_change_mtu
,
842 .ndo_vlan_rx_add_vid
= virtnet_vlan_rx_add_vid
,
843 .ndo_vlan_rx_kill_vid
= virtnet_vlan_rx_kill_vid
,
844 #ifdef CONFIG_NET_POLL_CONTROLLER
845 .ndo_poll_controller
= virtnet_netpoll
,
849 static void virtnet_update_status(struct virtnet_info
*vi
)
853 if (!virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_STATUS
))
856 vi
->vdev
->config
->get(vi
->vdev
,
857 offsetof(struct virtio_net_config
, status
),
860 /* Ignore unknown (future) status bits */
861 v
&= VIRTIO_NET_S_LINK_UP
;
868 if (vi
->status
& VIRTIO_NET_S_LINK_UP
) {
869 netif_carrier_on(vi
->dev
);
870 netif_wake_queue(vi
->dev
);
872 netif_carrier_off(vi
->dev
);
873 netif_stop_queue(vi
->dev
);
877 static void virtnet_config_changed(struct virtio_device
*vdev
)
879 struct virtnet_info
*vi
= vdev
->priv
;
881 virtnet_update_status(vi
);
884 static int virtnet_probe(struct virtio_device
*vdev
)
887 struct net_device
*dev
;
888 struct virtnet_info
*vi
;
889 struct virtqueue
*vqs
[3];
890 vq_callback_t
*callbacks
[] = { skb_recv_done
, skb_xmit_done
, NULL
};
891 const char *names
[] = { "input", "output", "control" };
894 /* Allocate ourselves a network device with room for our info */
895 dev
= alloc_etherdev(sizeof(struct virtnet_info
));
899 /* Set up network device as normal. */
900 dev
->netdev_ops
= &virtnet_netdev
;
901 dev
->features
= NETIF_F_HIGHDMA
;
902 SET_ETHTOOL_OPS(dev
, &virtnet_ethtool_ops
);
903 SET_NETDEV_DEV(dev
, &vdev
->dev
);
905 /* Do we support "hardware" checksums? */
906 if (csum
&& virtio_has_feature(vdev
, VIRTIO_NET_F_CSUM
)) {
907 /* This opens up the world of extra features. */
908 dev
->features
|= NETIF_F_HW_CSUM
|NETIF_F_SG
|NETIF_F_FRAGLIST
;
909 if (gso
&& virtio_has_feature(vdev
, VIRTIO_NET_F_GSO
)) {
910 dev
->features
|= NETIF_F_TSO
| NETIF_F_UFO
911 | NETIF_F_TSO_ECN
| NETIF_F_TSO6
;
913 /* Individual feature bits: what can host handle? */
914 if (gso
&& virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_TSO4
))
915 dev
->features
|= NETIF_F_TSO
;
916 if (gso
&& virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_TSO6
))
917 dev
->features
|= NETIF_F_TSO6
;
918 if (gso
&& virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_ECN
))
919 dev
->features
|= NETIF_F_TSO_ECN
;
920 if (gso
&& virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_UFO
))
921 dev
->features
|= NETIF_F_UFO
;
924 /* Configuration may specify what MAC to use. Otherwise random. */
925 if (virtio_has_feature(vdev
, VIRTIO_NET_F_MAC
)) {
926 vdev
->config
->get(vdev
,
927 offsetof(struct virtio_net_config
, mac
),
928 dev
->dev_addr
, dev
->addr_len
);
930 random_ether_addr(dev
->dev_addr
);
932 /* Set up our device-specific information */
933 vi
= netdev_priv(dev
);
934 netif_napi_add(dev
, &vi
->napi
, virtnet_poll
, napi_weight
);
939 INIT_DELAYED_WORK(&vi
->refill
, refill_work
);
940 sg_init_table(vi
->rx_sg
, ARRAY_SIZE(vi
->rx_sg
));
941 sg_init_table(vi
->tx_sg
, ARRAY_SIZE(vi
->tx_sg
));
943 /* If we can receive ANY GSO packets, we must allocate large ones. */
944 if (virtio_has_feature(vdev
, VIRTIO_NET_F_GUEST_TSO4
) ||
945 virtio_has_feature(vdev
, VIRTIO_NET_F_GUEST_TSO6
) ||
946 virtio_has_feature(vdev
, VIRTIO_NET_F_GUEST_ECN
))
947 vi
->big_packets
= true;
949 if (virtio_has_feature(vdev
, VIRTIO_NET_F_MRG_RXBUF
))
950 vi
->mergeable_rx_bufs
= true;
952 /* We expect two virtqueues, receive then send,
953 * and optionally control. */
954 nvqs
= virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_VQ
) ? 3 : 2;
956 err
= vdev
->config
->find_vqs(vdev
, nvqs
, vqs
, callbacks
, names
);
963 if (virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_VQ
)) {
966 if (virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_VLAN
))
967 dev
->features
|= NETIF_F_HW_VLAN_FILTER
;
970 err
= register_netdev(dev
);
972 pr_debug("virtio_net: registering device failed\n");
976 /* Last of all, set up some receive buffers. */
977 try_fill_recv(vi
, GFP_KERNEL
);
979 /* If we didn't even get one input buffer, we're useless. */
985 vi
->status
= VIRTIO_NET_S_LINK_UP
;
986 virtnet_update_status(vi
);
987 netif_carrier_on(dev
);
989 pr_debug("virtnet: registered device %s\n", dev
->name
);
993 unregister_netdev(dev
);
994 cancel_delayed_work_sync(&vi
->refill
);
996 vdev
->config
->del_vqs(vdev
);
1002 static void free_unused_bufs(struct virtnet_info
*vi
)
1006 buf
= vi
->svq
->vq_ops
->detach_unused_buf(vi
->svq
);
1012 buf
= vi
->rvq
->vq_ops
->detach_unused_buf(vi
->rvq
);
1015 if (vi
->mergeable_rx_bufs
|| vi
->big_packets
)
1016 give_pages(vi
, buf
);
1021 BUG_ON(vi
->num
!= 0);
1024 static void __devexit
virtnet_remove(struct virtio_device
*vdev
)
1026 struct virtnet_info
*vi
= vdev
->priv
;
1028 /* Stop all the virtqueues. */
1029 vdev
->config
->reset(vdev
);
1032 unregister_netdev(vi
->dev
);
1033 cancel_delayed_work_sync(&vi
->refill
);
1035 /* Free unused buffers in both send and recv, if any. */
1036 free_unused_bufs(vi
);
1038 vdev
->config
->del_vqs(vi
->vdev
);
1041 __free_pages(get_a_page(vi
, GFP_KERNEL
), 0);
1043 free_netdev(vi
->dev
);
1046 static struct virtio_device_id id_table
[] = {
1047 { VIRTIO_ID_NET
, VIRTIO_DEV_ANY_ID
},
1051 static unsigned int features
[] = {
1052 VIRTIO_NET_F_CSUM
, VIRTIO_NET_F_GUEST_CSUM
,
1053 VIRTIO_NET_F_GSO
, VIRTIO_NET_F_MAC
,
1054 VIRTIO_NET_F_HOST_TSO4
, VIRTIO_NET_F_HOST_UFO
, VIRTIO_NET_F_HOST_TSO6
,
1055 VIRTIO_NET_F_HOST_ECN
, VIRTIO_NET_F_GUEST_TSO4
, VIRTIO_NET_F_GUEST_TSO6
,
1056 VIRTIO_NET_F_GUEST_ECN
, VIRTIO_NET_F_GUEST_UFO
,
1057 VIRTIO_NET_F_MRG_RXBUF
, VIRTIO_NET_F_STATUS
, VIRTIO_NET_F_CTRL_VQ
,
1058 VIRTIO_NET_F_CTRL_RX
, VIRTIO_NET_F_CTRL_VLAN
,
1061 static struct virtio_driver virtio_net_driver
= {
1062 .feature_table
= features
,
1063 .feature_table_size
= ARRAY_SIZE(features
),
1064 .driver
.name
= KBUILD_MODNAME
,
1065 .driver
.owner
= THIS_MODULE
,
1066 .id_table
= id_table
,
1067 .probe
= virtnet_probe
,
1068 .remove
= __devexit_p(virtnet_remove
),
1069 .config_changed
= virtnet_config_changed
,
1072 static int __init
init(void)
1074 return register_virtio_driver(&virtio_net_driver
);
1077 static void __exit
fini(void)
1079 unregister_virtio_driver(&virtio_net_driver
);
1084 MODULE_DEVICE_TABLE(virtio
, id_table
);
1085 MODULE_DESCRIPTION("Virtio network driver");
1086 MODULE_LICENSE("GPL");