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
43 struct virtio_device
*vdev
;
44 struct virtqueue
*rvq
, *svq
, *cvq
;
45 struct net_device
*dev
;
46 struct napi_struct napi
;
49 /* Number of input buffers, and max we've ever had. */
50 unsigned int num
, max
;
52 /* I like... big packets and I cannot lie! */
55 /* Host will merge rx buffers for big packets (shake it! shake it!) */
56 bool mergeable_rx_bufs
;
58 /* Work struct for refilling if we run low on memory. */
59 struct delayed_work refill
;
61 /* Chain pages by the private ptr. */
64 /* fragments + linear part + virtio header */
65 struct scatterlist rx_sg
[MAX_SKB_FRAGS
+ 2];
66 struct scatterlist tx_sg
[MAX_SKB_FRAGS
+ 2];
71 struct virtio_net_hdr hdr
;
72 struct virtio_net_hdr_mrg_rxbuf mhdr
;
77 struct padded_vnet_hdr
{
78 struct virtio_net_hdr hdr
;
80 * virtio_net_hdr should be in a separated sg buffer because of a
81 * QEMU bug, and data sg buffer shares same page with this header sg.
82 * This padding makes next sg 16 byte aligned after virtio_net_hdr.
87 static inline struct skb_vnet_hdr
*skb_vnet_hdr(struct sk_buff
*skb
)
89 return (struct skb_vnet_hdr
*)skb
->cb
;
93 * private is used to chain pages for big packets, put the whole
94 * most recent used list in the beginning for reuse
96 static void give_pages(struct virtnet_info
*vi
, struct page
*page
)
100 /* Find end of list, sew whole thing into vi->pages. */
101 for (end
= page
; end
->private; end
= (struct page
*)end
->private);
102 end
->private = (unsigned long)vi
->pages
;
106 static struct page
*get_a_page(struct virtnet_info
*vi
, gfp_t gfp_mask
)
108 struct page
*p
= vi
->pages
;
111 vi
->pages
= (struct page
*)p
->private;
112 /* clear private here, it is used to chain pages */
115 p
= alloc_page(gfp_mask
);
119 static void skb_xmit_done(struct virtqueue
*svq
)
121 struct virtnet_info
*vi
= svq
->vdev
->priv
;
123 /* Suppress further interrupts. */
124 svq
->vq_ops
->disable_cb(svq
);
126 /* We were probably waiting for more output buffers. */
127 netif_wake_queue(vi
->dev
);
130 static void set_skb_frag(struct sk_buff
*skb
, struct page
*page
,
131 unsigned int offset
, unsigned int *len
)
133 int i
= skb_shinfo(skb
)->nr_frags
;
136 f
= &skb_shinfo(skb
)->frags
[i
];
137 f
->size
= min((unsigned)PAGE_SIZE
- offset
, *len
);
138 f
->page_offset
= offset
;
141 skb
->data_len
+= f
->size
;
143 skb_shinfo(skb
)->nr_frags
++;
147 static struct sk_buff
*page_to_skb(struct virtnet_info
*vi
,
148 struct page
*page
, unsigned int len
)
151 struct skb_vnet_hdr
*hdr
;
152 unsigned int copy
, hdr_len
, offset
;
155 p
= page_address(page
);
157 /* copy small packet so we can reuse these pages for small data */
158 skb
= netdev_alloc_skb_ip_align(vi
->dev
, GOOD_COPY_LEN
);
162 hdr
= skb_vnet_hdr(skb
);
164 if (vi
->mergeable_rx_bufs
) {
165 hdr_len
= sizeof hdr
->mhdr
;
168 hdr_len
= sizeof hdr
->hdr
;
169 offset
= sizeof(struct padded_vnet_hdr
);
172 memcpy(hdr
, p
, hdr_len
);
178 if (copy
> skb_tailroom(skb
))
179 copy
= skb_tailroom(skb
);
180 memcpy(skb_put(skb
, copy
), p
, copy
);
186 set_skb_frag(skb
, page
, offset
, &len
);
187 page
= (struct page
*)page
->private;
192 give_pages(vi
, page
);
197 static int receive_mergeable(struct virtnet_info
*vi
, struct sk_buff
*skb
)
199 struct skb_vnet_hdr
*hdr
= skb_vnet_hdr(skb
);
203 num_buf
= hdr
->mhdr
.num_buffers
;
205 i
= skb_shinfo(skb
)->nr_frags
;
206 if (i
>= MAX_SKB_FRAGS
) {
207 pr_debug("%s: packet too long\n", skb
->dev
->name
);
208 skb
->dev
->stats
.rx_length_errors
++;
212 page
= vi
->rvq
->vq_ops
->get_buf(vi
->rvq
, &len
);
214 pr_debug("%s: rx error: %d buffers missing\n",
215 skb
->dev
->name
, hdr
->mhdr
.num_buffers
);
216 skb
->dev
->stats
.rx_length_errors
++;
222 set_skb_frag(skb
, page
, 0, &len
);
229 static void receive_buf(struct net_device
*dev
, void *buf
, unsigned int len
)
231 struct virtnet_info
*vi
= netdev_priv(dev
);
234 struct skb_vnet_hdr
*hdr
;
236 if (unlikely(len
< sizeof(struct virtio_net_hdr
) + ETH_HLEN
)) {
237 pr_debug("%s: short packet %i\n", dev
->name
, len
);
238 dev
->stats
.rx_length_errors
++;
239 if (vi
->mergeable_rx_bufs
|| vi
->big_packets
)
246 if (!vi
->mergeable_rx_bufs
&& !vi
->big_packets
) {
248 len
-= sizeof(struct virtio_net_hdr
);
252 skb
= page_to_skb(vi
, page
, len
);
253 if (unlikely(!skb
)) {
254 dev
->stats
.rx_dropped
++;
255 give_pages(vi
, page
);
258 if (vi
->mergeable_rx_bufs
)
259 if (receive_mergeable(vi
, skb
)) {
265 hdr
= skb_vnet_hdr(skb
);
266 skb
->truesize
+= skb
->data_len
;
267 dev
->stats
.rx_bytes
+= skb
->len
;
268 dev
->stats
.rx_packets
++;
270 if (hdr
->hdr
.flags
& VIRTIO_NET_HDR_F_NEEDS_CSUM
) {
271 pr_debug("Needs csum!\n");
272 if (!skb_partial_csum_set(skb
,
274 hdr
->hdr
.csum_offset
))
278 skb
->protocol
= eth_type_trans(skb
, dev
);
279 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
280 ntohs(skb
->protocol
), skb
->len
, skb
->pkt_type
);
282 if (hdr
->hdr
.gso_type
!= VIRTIO_NET_HDR_GSO_NONE
) {
284 switch (hdr
->hdr
.gso_type
& ~VIRTIO_NET_HDR_GSO_ECN
) {
285 case VIRTIO_NET_HDR_GSO_TCPV4
:
286 skb_shinfo(skb
)->gso_type
= SKB_GSO_TCPV4
;
288 case VIRTIO_NET_HDR_GSO_UDP
:
289 skb_shinfo(skb
)->gso_type
= SKB_GSO_UDP
;
291 case VIRTIO_NET_HDR_GSO_TCPV6
:
292 skb_shinfo(skb
)->gso_type
= SKB_GSO_TCPV6
;
296 printk(KERN_WARNING
"%s: bad gso type %u.\n",
297 dev
->name
, hdr
->hdr
.gso_type
);
301 if (hdr
->hdr
.gso_type
& VIRTIO_NET_HDR_GSO_ECN
)
302 skb_shinfo(skb
)->gso_type
|= SKB_GSO_TCP_ECN
;
304 skb_shinfo(skb
)->gso_size
= hdr
->hdr
.gso_size
;
305 if (skb_shinfo(skb
)->gso_size
== 0) {
307 printk(KERN_WARNING
"%s: zero gso size.\n",
312 /* Header must be checked, and gso_segs computed. */
313 skb_shinfo(skb
)->gso_type
|= SKB_GSO_DODGY
;
314 skb_shinfo(skb
)->gso_segs
= 0;
317 netif_receive_skb(skb
);
321 dev
->stats
.rx_frame_errors
++;
325 static int add_recvbuf_small(struct virtnet_info
*vi
, gfp_t gfp
)
328 struct skb_vnet_hdr
*hdr
;
331 skb
= netdev_alloc_skb_ip_align(vi
->dev
, MAX_PACKET_LEN
);
335 skb_put(skb
, MAX_PACKET_LEN
);
337 hdr
= skb_vnet_hdr(skb
);
338 sg_set_buf(vi
->rx_sg
, &hdr
->hdr
, sizeof hdr
->hdr
);
340 skb_to_sgvec(skb
, vi
->rx_sg
+ 1, 0, skb
->len
);
342 err
= vi
->rvq
->vq_ops
->add_buf(vi
->rvq
, vi
->rx_sg
, 0, 2, skb
);
349 static int add_recvbuf_big(struct virtnet_info
*vi
, gfp_t gfp
)
351 struct page
*first
, *list
= NULL
;
355 /* page in vi->rx_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(&vi
->rx_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 /* vi->rx_sg[0], vi->rx_sg[1] share the same page */
378 /* a separated vi->rx_sg[0] for virtio_net_hdr only due to QEMU bug */
379 sg_set_buf(&vi
->rx_sg
[0], p
, sizeof(struct virtio_net_hdr
));
381 /* vi->rx_sg[1] for data packet, from offset */
382 offset
= sizeof(struct padded_vnet_hdr
);
383 sg_set_buf(&vi
->rx_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
, vi
->rx_sg
, 0, MAX_SKB_FRAGS
+ 2,
390 give_pages(vi
, first
);
395 static int add_recvbuf_mergeable(struct virtnet_info
*vi
, gfp_t gfp
)
400 page
= get_a_page(vi
, gfp
);
404 sg_init_one(vi
->rx_sg
, page_address(page
), PAGE_SIZE
);
406 err
= vi
->rvq
->vq_ops
->add_buf(vi
->rvq
, vi
->rx_sg
, 0, 1, page
);
408 give_pages(vi
, page
);
413 /* Returns false if we couldn't fill entirely (OOM). */
414 static bool try_fill_recv(struct virtnet_info
*vi
, gfp_t gfp
)
420 if (vi
->mergeable_rx_bufs
)
421 err
= add_recvbuf_mergeable(vi
, gfp
);
422 else if (vi
->big_packets
)
423 err
= add_recvbuf_big(vi
, gfp
);
425 err
= add_recvbuf_small(vi
, gfp
);
433 if (unlikely(vi
->num
> vi
->max
))
435 vi
->rvq
->vq_ops
->kick(vi
->rvq
);
439 static void skb_recv_done(struct virtqueue
*rvq
)
441 struct virtnet_info
*vi
= rvq
->vdev
->priv
;
442 /* Schedule NAPI, Suppress further interrupts if successful. */
443 if (napi_schedule_prep(&vi
->napi
)) {
444 rvq
->vq_ops
->disable_cb(rvq
);
445 __napi_schedule(&vi
->napi
);
449 static void refill_work(struct work_struct
*work
)
451 struct virtnet_info
*vi
;
454 vi
= container_of(work
, struct virtnet_info
, refill
.work
);
455 napi_disable(&vi
->napi
);
456 still_empty
= !try_fill_recv(vi
, GFP_KERNEL
);
457 napi_enable(&vi
->napi
);
459 /* In theory, this can happen: if we don't get any buffers in
460 * we will *never* try to fill again. */
462 schedule_delayed_work(&vi
->refill
, HZ
/2);
465 static int virtnet_poll(struct napi_struct
*napi
, int budget
)
467 struct virtnet_info
*vi
= container_of(napi
, struct virtnet_info
, napi
);
469 unsigned int len
, received
= 0;
472 while (received
< budget
&&
473 (buf
= vi
->rvq
->vq_ops
->get_buf(vi
->rvq
, &len
)) != NULL
) {
474 receive_buf(vi
->dev
, buf
, len
);
479 if (vi
->num
< vi
->max
/ 2) {
480 if (!try_fill_recv(vi
, GFP_ATOMIC
))
481 schedule_delayed_work(&vi
->refill
, 0);
484 /* Out of packets? */
485 if (received
< budget
) {
487 if (unlikely(!vi
->rvq
->vq_ops
->enable_cb(vi
->rvq
)) &&
488 napi_schedule_prep(napi
)) {
489 vi
->rvq
->vq_ops
->disable_cb(vi
->rvq
);
490 __napi_schedule(napi
);
498 static unsigned int free_old_xmit_skbs(struct virtnet_info
*vi
)
501 unsigned int len
, tot_sgs
= 0;
503 while ((skb
= vi
->svq
->vq_ops
->get_buf(vi
->svq
, &len
)) != NULL
) {
504 pr_debug("Sent skb %p\n", skb
);
505 vi
->dev
->stats
.tx_bytes
+= skb
->len
;
506 vi
->dev
->stats
.tx_packets
++;
507 tot_sgs
+= skb_vnet_hdr(skb
)->num_sg
;
508 dev_kfree_skb_any(skb
);
513 static int xmit_skb(struct virtnet_info
*vi
, struct sk_buff
*skb
)
515 struct skb_vnet_hdr
*hdr
= skb_vnet_hdr(skb
);
516 const unsigned char *dest
= ((struct ethhdr
*)skb
->data
)->h_dest
;
518 pr_debug("%s: xmit %p %pM\n", vi
->dev
->name
, skb
, dest
);
520 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
521 hdr
->hdr
.flags
= VIRTIO_NET_HDR_F_NEEDS_CSUM
;
522 hdr
->hdr
.csum_start
= skb
->csum_start
- skb_headroom(skb
);
523 hdr
->hdr
.csum_offset
= skb
->csum_offset
;
526 hdr
->hdr
.csum_offset
= hdr
->hdr
.csum_start
= 0;
529 if (skb_is_gso(skb
)) {
530 hdr
->hdr
.hdr_len
= skb_headlen(skb
);
531 hdr
->hdr
.gso_size
= skb_shinfo(skb
)->gso_size
;
532 if (skb_shinfo(skb
)->gso_type
& SKB_GSO_TCPV4
)
533 hdr
->hdr
.gso_type
= VIRTIO_NET_HDR_GSO_TCPV4
;
534 else if (skb_shinfo(skb
)->gso_type
& SKB_GSO_TCPV6
)
535 hdr
->hdr
.gso_type
= VIRTIO_NET_HDR_GSO_TCPV6
;
536 else if (skb_shinfo(skb
)->gso_type
& SKB_GSO_UDP
)
537 hdr
->hdr
.gso_type
= VIRTIO_NET_HDR_GSO_UDP
;
540 if (skb_shinfo(skb
)->gso_type
& SKB_GSO_TCP_ECN
)
541 hdr
->hdr
.gso_type
|= VIRTIO_NET_HDR_GSO_ECN
;
543 hdr
->hdr
.gso_type
= VIRTIO_NET_HDR_GSO_NONE
;
544 hdr
->hdr
.gso_size
= hdr
->hdr
.hdr_len
= 0;
547 hdr
->mhdr
.num_buffers
= 0;
549 /* Encode metadata header at front. */
550 if (vi
->mergeable_rx_bufs
)
551 sg_set_buf(vi
->tx_sg
, &hdr
->mhdr
, sizeof hdr
->mhdr
);
553 sg_set_buf(vi
->tx_sg
, &hdr
->hdr
, sizeof hdr
->hdr
);
555 hdr
->num_sg
= skb_to_sgvec(skb
, vi
->tx_sg
+ 1, 0, skb
->len
) + 1;
556 return vi
->svq
->vq_ops
->add_buf(vi
->svq
, vi
->tx_sg
, hdr
->num_sg
,
560 static netdev_tx_t
start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
562 struct virtnet_info
*vi
= netdev_priv(dev
);
566 /* Free up any pending old buffers before queueing new ones. */
567 free_old_xmit_skbs(vi
);
569 /* Try to transmit */
570 capacity
= xmit_skb(vi
, skb
);
572 /* This can happen with OOM and indirect buffers. */
573 if (unlikely(capacity
< 0)) {
574 netif_stop_queue(dev
);
575 dev_warn(&dev
->dev
, "Unexpected full queue\n");
576 if (unlikely(!vi
->svq
->vq_ops
->enable_cb(vi
->svq
))) {
577 vi
->svq
->vq_ops
->disable_cb(vi
->svq
);
578 netif_start_queue(dev
);
581 return NETDEV_TX_BUSY
;
583 vi
->svq
->vq_ops
->kick(vi
->svq
);
585 /* Don't wait up for transmitted skbs to be freed. */
589 /* Apparently nice girls don't return TX_BUSY; stop the queue
590 * before it gets out of hand. Naturally, this wastes entries. */
591 if (capacity
< 2+MAX_SKB_FRAGS
) {
592 netif_stop_queue(dev
);
593 if (unlikely(!vi
->svq
->vq_ops
->enable_cb(vi
->svq
))) {
594 /* More just got used, free them then recheck. */
595 capacity
+= free_old_xmit_skbs(vi
);
596 if (capacity
>= 2+MAX_SKB_FRAGS
) {
597 netif_start_queue(dev
);
598 vi
->svq
->vq_ops
->disable_cb(vi
->svq
);
606 static int virtnet_set_mac_address(struct net_device
*dev
, void *p
)
608 struct virtnet_info
*vi
= netdev_priv(dev
);
609 struct virtio_device
*vdev
= vi
->vdev
;
612 ret
= eth_mac_addr(dev
, p
);
616 if (virtio_has_feature(vdev
, VIRTIO_NET_F_MAC
))
617 vdev
->config
->set(vdev
, offsetof(struct virtio_net_config
, mac
),
618 dev
->dev_addr
, dev
->addr_len
);
623 #ifdef CONFIG_NET_POLL_CONTROLLER
624 static void virtnet_netpoll(struct net_device
*dev
)
626 struct virtnet_info
*vi
= netdev_priv(dev
);
628 napi_schedule(&vi
->napi
);
632 static int virtnet_open(struct net_device
*dev
)
634 struct virtnet_info
*vi
= netdev_priv(dev
);
636 napi_enable(&vi
->napi
);
638 /* If all buffers were filled by other side before we napi_enabled, we
639 * won't get another interrupt, so process any outstanding packets
640 * now. virtnet_poll wants re-enable the queue, so we disable here.
641 * We synchronize against interrupts via NAPI_STATE_SCHED */
642 if (napi_schedule_prep(&vi
->napi
)) {
643 vi
->rvq
->vq_ops
->disable_cb(vi
->rvq
);
644 __napi_schedule(&vi
->napi
);
650 * Send command via the control virtqueue and check status. Commands
651 * supported by the hypervisor, as indicated by feature bits, should
652 * never fail unless improperly formated.
654 static bool virtnet_send_command(struct virtnet_info
*vi
, u8
class, u8 cmd
,
655 struct scatterlist
*data
, int out
, int in
)
657 struct scatterlist
*s
, sg
[VIRTNET_SEND_COMMAND_SG_MAX
+ 2];
658 struct virtio_net_ctrl_hdr ctrl
;
659 virtio_net_ctrl_ack status
= ~0;
663 /* Caller should know better */
664 BUG_ON(!virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_VQ
) ||
665 (out
+ in
> VIRTNET_SEND_COMMAND_SG_MAX
));
667 out
++; /* Add header */
668 in
++; /* Add return status */
673 sg_init_table(sg
, out
+ in
);
675 sg_set_buf(&sg
[0], &ctrl
, sizeof(ctrl
));
676 for_each_sg(data
, s
, out
+ in
- 2, i
)
677 sg_set_buf(&sg
[i
+ 1], sg_virt(s
), s
->length
);
678 sg_set_buf(&sg
[out
+ in
- 1], &status
, sizeof(status
));
680 BUG_ON(vi
->cvq
->vq_ops
->add_buf(vi
->cvq
, sg
, out
, in
, vi
) < 0);
682 vi
->cvq
->vq_ops
->kick(vi
->cvq
);
685 * Spin for a response, the kick causes an ioport write, trapping
686 * into the hypervisor, so the request should be handled immediately.
688 while (!vi
->cvq
->vq_ops
->get_buf(vi
->cvq
, &tmp
))
691 return status
== VIRTIO_NET_OK
;
694 static int virtnet_close(struct net_device
*dev
)
696 struct virtnet_info
*vi
= netdev_priv(dev
);
698 napi_disable(&vi
->napi
);
703 static int virtnet_set_tx_csum(struct net_device
*dev
, u32 data
)
705 struct virtnet_info
*vi
= netdev_priv(dev
);
706 struct virtio_device
*vdev
= vi
->vdev
;
708 if (data
&& !virtio_has_feature(vdev
, VIRTIO_NET_F_CSUM
))
711 return ethtool_op_set_tx_hw_csum(dev
, data
);
714 static void virtnet_set_rx_mode(struct net_device
*dev
)
716 struct virtnet_info
*vi
= netdev_priv(dev
);
717 struct scatterlist sg
[2];
718 u8 promisc
, allmulti
;
719 struct virtio_net_ctrl_mac
*mac_data
;
720 struct netdev_hw_addr
*ha
;
726 /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */
727 if (!virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_RX
))
730 promisc
= ((dev
->flags
& IFF_PROMISC
) != 0);
731 allmulti
= ((dev
->flags
& IFF_ALLMULTI
) != 0);
733 sg_init_one(sg
, &promisc
, sizeof(promisc
));
735 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_RX
,
736 VIRTIO_NET_CTRL_RX_PROMISC
,
738 dev_warn(&dev
->dev
, "Failed to %sable promisc mode.\n",
739 promisc
? "en" : "dis");
741 sg_init_one(sg
, &allmulti
, sizeof(allmulti
));
743 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_RX
,
744 VIRTIO_NET_CTRL_RX_ALLMULTI
,
746 dev_warn(&dev
->dev
, "Failed to %sable allmulti mode.\n",
747 allmulti
? "en" : "dis");
749 uc_count
= netdev_uc_count(dev
);
750 mc_count
= netdev_mc_count(dev
);
751 /* MAC filter - use one buffer for both lists */
752 buf
= kzalloc(((uc_count
+ mc_count
) * ETH_ALEN
) +
753 (2 * sizeof(mac_data
->entries
)), GFP_ATOMIC
);
756 dev_warn(&dev
->dev
, "No memory for MAC address buffer\n");
760 sg_init_table(sg
, 2);
762 /* Store the unicast list and count in the front of the buffer */
763 mac_data
->entries
= uc_count
;
765 netdev_for_each_uc_addr(ha
, dev
)
766 memcpy(&mac_data
->macs
[i
++][0], ha
->addr
, ETH_ALEN
);
768 sg_set_buf(&sg
[0], mac_data
,
769 sizeof(mac_data
->entries
) + (uc_count
* ETH_ALEN
));
771 /* multicast list and count fill the end */
772 mac_data
= (void *)&mac_data
->macs
[uc_count
][0];
774 mac_data
->entries
= mc_count
;
776 netdev_for_each_mc_addr(ha
, dev
)
777 memcpy(&mac_data
->macs
[i
++][0], ha
->addr
, ETH_ALEN
);
779 sg_set_buf(&sg
[1], mac_data
,
780 sizeof(mac_data
->entries
) + (mc_count
* ETH_ALEN
));
782 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_MAC
,
783 VIRTIO_NET_CTRL_MAC_TABLE_SET
,
785 dev_warn(&dev
->dev
, "Failed to set MAC fitler table.\n");
790 static void virtnet_vlan_rx_add_vid(struct net_device
*dev
, u16 vid
)
792 struct virtnet_info
*vi
= netdev_priv(dev
);
793 struct scatterlist sg
;
795 sg_init_one(&sg
, &vid
, sizeof(vid
));
797 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_VLAN
,
798 VIRTIO_NET_CTRL_VLAN_ADD
, &sg
, 1, 0))
799 dev_warn(&dev
->dev
, "Failed to add VLAN ID %d.\n", vid
);
802 static void virtnet_vlan_rx_kill_vid(struct net_device
*dev
, u16 vid
)
804 struct virtnet_info
*vi
= netdev_priv(dev
);
805 struct scatterlist sg
;
807 sg_init_one(&sg
, &vid
, sizeof(vid
));
809 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_VLAN
,
810 VIRTIO_NET_CTRL_VLAN_DEL
, &sg
, 1, 0))
811 dev_warn(&dev
->dev
, "Failed to kill VLAN ID %d.\n", vid
);
814 static const struct ethtool_ops virtnet_ethtool_ops
= {
815 .set_tx_csum
= virtnet_set_tx_csum
,
816 .set_sg
= ethtool_op_set_sg
,
817 .set_tso
= ethtool_op_set_tso
,
818 .set_ufo
= ethtool_op_set_ufo
,
819 .get_link
= ethtool_op_get_link
,
823 #define MAX_MTU 65535
825 static int virtnet_change_mtu(struct net_device
*dev
, int new_mtu
)
827 if (new_mtu
< MIN_MTU
|| new_mtu
> MAX_MTU
)
833 static const struct net_device_ops virtnet_netdev
= {
834 .ndo_open
= virtnet_open
,
835 .ndo_stop
= virtnet_close
,
836 .ndo_start_xmit
= start_xmit
,
837 .ndo_validate_addr
= eth_validate_addr
,
838 .ndo_set_mac_address
= virtnet_set_mac_address
,
839 .ndo_set_rx_mode
= virtnet_set_rx_mode
,
840 .ndo_change_mtu
= virtnet_change_mtu
,
841 .ndo_vlan_rx_add_vid
= virtnet_vlan_rx_add_vid
,
842 .ndo_vlan_rx_kill_vid
= virtnet_vlan_rx_kill_vid
,
843 #ifdef CONFIG_NET_POLL_CONTROLLER
844 .ndo_poll_controller
= virtnet_netpoll
,
848 static void virtnet_update_status(struct virtnet_info
*vi
)
852 if (!virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_STATUS
))
855 vi
->vdev
->config
->get(vi
->vdev
,
856 offsetof(struct virtio_net_config
, status
),
859 /* Ignore unknown (future) status bits */
860 v
&= VIRTIO_NET_S_LINK_UP
;
867 if (vi
->status
& VIRTIO_NET_S_LINK_UP
) {
868 netif_carrier_on(vi
->dev
);
869 netif_wake_queue(vi
->dev
);
871 netif_carrier_off(vi
->dev
);
872 netif_stop_queue(vi
->dev
);
876 static void virtnet_config_changed(struct virtio_device
*vdev
)
878 struct virtnet_info
*vi
= vdev
->priv
;
880 virtnet_update_status(vi
);
883 static int virtnet_probe(struct virtio_device
*vdev
)
886 struct net_device
*dev
;
887 struct virtnet_info
*vi
;
888 struct virtqueue
*vqs
[3];
889 vq_callback_t
*callbacks
[] = { skb_recv_done
, skb_xmit_done
, NULL
};
890 const char *names
[] = { "input", "output", "control" };
893 /* Allocate ourselves a network device with room for our info */
894 dev
= alloc_etherdev(sizeof(struct virtnet_info
));
898 /* Set up network device as normal. */
899 dev
->netdev_ops
= &virtnet_netdev
;
900 dev
->features
= NETIF_F_HIGHDMA
;
901 SET_ETHTOOL_OPS(dev
, &virtnet_ethtool_ops
);
902 SET_NETDEV_DEV(dev
, &vdev
->dev
);
904 /* Do we support "hardware" checksums? */
905 if (csum
&& virtio_has_feature(vdev
, VIRTIO_NET_F_CSUM
)) {
906 /* This opens up the world of extra features. */
907 dev
->features
|= NETIF_F_HW_CSUM
|NETIF_F_SG
|NETIF_F_FRAGLIST
;
908 if (gso
&& virtio_has_feature(vdev
, VIRTIO_NET_F_GSO
)) {
909 dev
->features
|= NETIF_F_TSO
| NETIF_F_UFO
910 | NETIF_F_TSO_ECN
| NETIF_F_TSO6
;
912 /* Individual feature bits: what can host handle? */
913 if (gso
&& virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_TSO4
))
914 dev
->features
|= NETIF_F_TSO
;
915 if (gso
&& virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_TSO6
))
916 dev
->features
|= NETIF_F_TSO6
;
917 if (gso
&& virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_ECN
))
918 dev
->features
|= NETIF_F_TSO_ECN
;
919 if (gso
&& virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_UFO
))
920 dev
->features
|= NETIF_F_UFO
;
923 /* Configuration may specify what MAC to use. Otherwise random. */
924 if (virtio_has_feature(vdev
, VIRTIO_NET_F_MAC
)) {
925 vdev
->config
->get(vdev
,
926 offsetof(struct virtio_net_config
, mac
),
927 dev
->dev_addr
, dev
->addr_len
);
929 random_ether_addr(dev
->dev_addr
);
931 /* Set up our device-specific information */
932 vi
= netdev_priv(dev
);
933 netif_napi_add(dev
, &vi
->napi
, virtnet_poll
, napi_weight
);
938 INIT_DELAYED_WORK(&vi
->refill
, refill_work
);
939 sg_init_table(vi
->rx_sg
, ARRAY_SIZE(vi
->rx_sg
));
940 sg_init_table(vi
->tx_sg
, ARRAY_SIZE(vi
->tx_sg
));
942 /* If we can receive ANY GSO packets, we must allocate large ones. */
943 if (virtio_has_feature(vdev
, VIRTIO_NET_F_GUEST_TSO4
) ||
944 virtio_has_feature(vdev
, VIRTIO_NET_F_GUEST_TSO6
) ||
945 virtio_has_feature(vdev
, VIRTIO_NET_F_GUEST_ECN
))
946 vi
->big_packets
= true;
948 if (virtio_has_feature(vdev
, VIRTIO_NET_F_MRG_RXBUF
))
949 vi
->mergeable_rx_bufs
= true;
951 /* We expect two virtqueues, receive then send,
952 * and optionally control. */
953 nvqs
= virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_VQ
) ? 3 : 2;
955 err
= vdev
->config
->find_vqs(vdev
, nvqs
, vqs
, callbacks
, names
);
962 if (virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_VQ
)) {
965 if (virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_VLAN
))
966 dev
->features
|= NETIF_F_HW_VLAN_FILTER
;
969 err
= register_netdev(dev
);
971 pr_debug("virtio_net: registering device failed\n");
975 /* Last of all, set up some receive buffers. */
976 try_fill_recv(vi
, GFP_KERNEL
);
978 /* If we didn't even get one input buffer, we're useless. */
984 vi
->status
= VIRTIO_NET_S_LINK_UP
;
985 virtnet_update_status(vi
);
986 netif_carrier_on(dev
);
988 pr_debug("virtnet: registered device %s\n", dev
->name
);
992 unregister_netdev(dev
);
993 cancel_delayed_work_sync(&vi
->refill
);
995 vdev
->config
->del_vqs(vdev
);
1001 static void free_unused_bufs(struct virtnet_info
*vi
)
1005 buf
= vi
->svq
->vq_ops
->detach_unused_buf(vi
->svq
);
1011 buf
= vi
->rvq
->vq_ops
->detach_unused_buf(vi
->rvq
);
1014 if (vi
->mergeable_rx_bufs
|| vi
->big_packets
)
1015 give_pages(vi
, buf
);
1020 BUG_ON(vi
->num
!= 0);
1023 static void __devexit
virtnet_remove(struct virtio_device
*vdev
)
1025 struct virtnet_info
*vi
= vdev
->priv
;
1027 /* Stop all the virtqueues. */
1028 vdev
->config
->reset(vdev
);
1031 unregister_netdev(vi
->dev
);
1032 cancel_delayed_work_sync(&vi
->refill
);
1034 /* Free unused buffers in both send and recv, if any. */
1035 free_unused_bufs(vi
);
1037 vdev
->config
->del_vqs(vi
->vdev
);
1040 __free_pages(get_a_page(vi
, GFP_KERNEL
), 0);
1042 free_netdev(vi
->dev
);
1045 static struct virtio_device_id id_table
[] = {
1046 { VIRTIO_ID_NET
, VIRTIO_DEV_ANY_ID
},
1050 static unsigned int features
[] = {
1051 VIRTIO_NET_F_CSUM
, VIRTIO_NET_F_GUEST_CSUM
,
1052 VIRTIO_NET_F_GSO
, VIRTIO_NET_F_MAC
,
1053 VIRTIO_NET_F_HOST_TSO4
, VIRTIO_NET_F_HOST_UFO
, VIRTIO_NET_F_HOST_TSO6
,
1054 VIRTIO_NET_F_HOST_ECN
, VIRTIO_NET_F_GUEST_TSO4
, VIRTIO_NET_F_GUEST_TSO6
,
1055 VIRTIO_NET_F_GUEST_ECN
, VIRTIO_NET_F_GUEST_UFO
,
1056 VIRTIO_NET_F_MRG_RXBUF
, VIRTIO_NET_F_STATUS
, VIRTIO_NET_F_CTRL_VQ
,
1057 VIRTIO_NET_F_CTRL_RX
, VIRTIO_NET_F_CTRL_VLAN
,
1060 static struct virtio_driver virtio_net_driver
= {
1061 .feature_table
= features
,
1062 .feature_table_size
= ARRAY_SIZE(features
),
1063 .driver
.name
= KBUILD_MODNAME
,
1064 .driver
.owner
= THIS_MODULE
,
1065 .id_table
= id_table
,
1066 .probe
= virtnet_probe
,
1067 .remove
= __devexit_p(virtnet_remove
),
1068 .config_changed
= virtnet_config_changed
,
1071 static int __init
init(void)
1073 return register_virtio_driver(&virtio_net_driver
);
1076 static void __exit
fini(void)
1078 unregister_virtio_driver(&virtio_net_driver
);
1083 MODULE_DEVICE_TABLE(virtio
, id_table
);
1084 MODULE_DESCRIPTION("Virtio network driver");
1085 MODULE_LICENSE("GPL");