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
43 struct virtnet_stats
{
44 struct u64_stats_sync syncp
;
53 struct virtio_device
*vdev
;
54 struct virtqueue
*rvq
, *svq
, *cvq
;
55 struct net_device
*dev
;
56 struct napi_struct napi
;
59 /* Number of input buffers, and max we've ever had. */
60 unsigned int num
, max
;
62 /* I like... big packets and I cannot lie! */
65 /* Host will merge rx buffers for big packets (shake it! shake it!) */
66 bool mergeable_rx_bufs
;
68 /* Active statistics */
69 struct virtnet_stats __percpu
*stats
;
71 /* Work struct for refilling if we run low on memory. */
72 struct delayed_work refill
;
74 /* Chain pages by the private ptr. */
77 /* fragments + linear part + virtio header */
78 struct scatterlist rx_sg
[MAX_SKB_FRAGS
+ 2];
79 struct scatterlist tx_sg
[MAX_SKB_FRAGS
+ 2];
84 struct virtio_net_hdr hdr
;
85 struct virtio_net_hdr_mrg_rxbuf mhdr
;
90 struct padded_vnet_hdr
{
91 struct virtio_net_hdr hdr
;
93 * virtio_net_hdr should be in a separated sg buffer because of a
94 * QEMU bug, and data sg buffer shares same page with this header sg.
95 * This padding makes next sg 16 byte aligned after virtio_net_hdr.
100 static inline struct skb_vnet_hdr
*skb_vnet_hdr(struct sk_buff
*skb
)
102 return (struct skb_vnet_hdr
*)skb
->cb
;
106 * private is used to chain pages for big packets, put the whole
107 * most recent used list in the beginning for reuse
109 static void give_pages(struct virtnet_info
*vi
, struct page
*page
)
113 /* Find end of list, sew whole thing into vi->pages. */
114 for (end
= page
; end
->private; end
= (struct page
*)end
->private);
115 end
->private = (unsigned long)vi
->pages
;
119 static struct page
*get_a_page(struct virtnet_info
*vi
, gfp_t gfp_mask
)
121 struct page
*p
= vi
->pages
;
124 vi
->pages
= (struct page
*)p
->private;
125 /* clear private here, it is used to chain pages */
128 p
= alloc_page(gfp_mask
);
132 static void skb_xmit_done(struct virtqueue
*svq
)
134 struct virtnet_info
*vi
= svq
->vdev
->priv
;
136 /* Suppress further interrupts. */
137 virtqueue_disable_cb(svq
);
139 /* We were probably waiting for more output buffers. */
140 netif_wake_queue(vi
->dev
);
143 static void set_skb_frag(struct sk_buff
*skb
, struct page
*page
,
144 unsigned int offset
, unsigned int *len
)
146 int i
= skb_shinfo(skb
)->nr_frags
;
149 f
= &skb_shinfo(skb
)->frags
[i
];
150 skb_frag_size_set(f
, min((unsigned)PAGE_SIZE
- offset
, *len
));
151 f
->page_offset
= offset
;
152 __skb_frag_set_page(f
, page
);
154 skb
->data_len
+= skb_frag_size(f
);
155 skb
->len
+= skb_frag_size(f
);
156 skb_shinfo(skb
)->nr_frags
++;
157 *len
-= skb_frag_size(f
);
160 static struct sk_buff
*page_to_skb(struct virtnet_info
*vi
,
161 struct page
*page
, unsigned int len
)
164 struct skb_vnet_hdr
*hdr
;
165 unsigned int copy
, hdr_len
, offset
;
168 p
= page_address(page
);
170 /* copy small packet so we can reuse these pages for small data */
171 skb
= netdev_alloc_skb_ip_align(vi
->dev
, GOOD_COPY_LEN
);
175 hdr
= skb_vnet_hdr(skb
);
177 if (vi
->mergeable_rx_bufs
) {
178 hdr_len
= sizeof hdr
->mhdr
;
181 hdr_len
= sizeof hdr
->hdr
;
182 offset
= sizeof(struct padded_vnet_hdr
);
185 memcpy(hdr
, p
, hdr_len
);
191 if (copy
> skb_tailroom(skb
))
192 copy
= skb_tailroom(skb
);
193 memcpy(skb_put(skb
, copy
), p
, copy
);
199 * Verify that we can indeed put this data into a skb.
200 * This is here to handle cases when the device erroneously
201 * tries to receive more than is possible. This is usually
202 * the case of a broken device.
204 if (unlikely(len
> MAX_SKB_FRAGS
* PAGE_SIZE
)) {
206 pr_debug("%s: too much data\n", skb
->dev
->name
);
212 set_skb_frag(skb
, page
, offset
, &len
);
213 page
= (struct page
*)page
->private;
218 give_pages(vi
, page
);
223 static int receive_mergeable(struct virtnet_info
*vi
, struct sk_buff
*skb
)
225 struct skb_vnet_hdr
*hdr
= skb_vnet_hdr(skb
);
229 num_buf
= hdr
->mhdr
.num_buffers
;
231 i
= skb_shinfo(skb
)->nr_frags
;
232 if (i
>= MAX_SKB_FRAGS
) {
233 pr_debug("%s: packet too long\n", skb
->dev
->name
);
234 skb
->dev
->stats
.rx_length_errors
++;
237 page
= virtqueue_get_buf(vi
->rvq
, &len
);
239 pr_debug("%s: rx error: %d buffers missing\n",
240 skb
->dev
->name
, hdr
->mhdr
.num_buffers
);
241 skb
->dev
->stats
.rx_length_errors
++;
248 set_skb_frag(skb
, page
, 0, &len
);
255 static void receive_buf(struct net_device
*dev
, void *buf
, unsigned int len
)
257 struct virtnet_info
*vi
= netdev_priv(dev
);
258 struct virtnet_stats __percpu
*stats
= this_cpu_ptr(vi
->stats
);
261 struct skb_vnet_hdr
*hdr
;
263 if (unlikely(len
< sizeof(struct virtio_net_hdr
) + ETH_HLEN
)) {
264 pr_debug("%s: short packet %i\n", dev
->name
, len
);
265 dev
->stats
.rx_length_errors
++;
266 if (vi
->mergeable_rx_bufs
|| vi
->big_packets
)
273 if (!vi
->mergeable_rx_bufs
&& !vi
->big_packets
) {
275 len
-= sizeof(struct virtio_net_hdr
);
279 skb
= page_to_skb(vi
, page
, len
);
280 if (unlikely(!skb
)) {
281 dev
->stats
.rx_dropped
++;
282 give_pages(vi
, page
);
285 if (vi
->mergeable_rx_bufs
)
286 if (receive_mergeable(vi
, skb
)) {
292 hdr
= skb_vnet_hdr(skb
);
293 skb
->truesize
+= skb
->data_len
;
295 u64_stats_update_begin(&stats
->syncp
);
296 stats
->rx_bytes
+= skb
->len
;
298 u64_stats_update_end(&stats
->syncp
);
300 if (hdr
->hdr
.flags
& VIRTIO_NET_HDR_F_NEEDS_CSUM
) {
301 pr_debug("Needs csum!\n");
302 if (!skb_partial_csum_set(skb
,
304 hdr
->hdr
.csum_offset
))
306 } else if (hdr
->hdr
.flags
& VIRTIO_NET_HDR_F_DATA_VALID
) {
307 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
310 skb
->protocol
= eth_type_trans(skb
, dev
);
311 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
312 ntohs(skb
->protocol
), skb
->len
, skb
->pkt_type
);
314 if (hdr
->hdr
.gso_type
!= VIRTIO_NET_HDR_GSO_NONE
) {
316 switch (hdr
->hdr
.gso_type
& ~VIRTIO_NET_HDR_GSO_ECN
) {
317 case VIRTIO_NET_HDR_GSO_TCPV4
:
318 skb_shinfo(skb
)->gso_type
= SKB_GSO_TCPV4
;
320 case VIRTIO_NET_HDR_GSO_UDP
:
321 skb_shinfo(skb
)->gso_type
= SKB_GSO_UDP
;
323 case VIRTIO_NET_HDR_GSO_TCPV6
:
324 skb_shinfo(skb
)->gso_type
= SKB_GSO_TCPV6
;
328 printk(KERN_WARNING
"%s: bad gso type %u.\n",
329 dev
->name
, hdr
->hdr
.gso_type
);
333 if (hdr
->hdr
.gso_type
& VIRTIO_NET_HDR_GSO_ECN
)
334 skb_shinfo(skb
)->gso_type
|= SKB_GSO_TCP_ECN
;
336 skb_shinfo(skb
)->gso_size
= hdr
->hdr
.gso_size
;
337 if (skb_shinfo(skb
)->gso_size
== 0) {
339 printk(KERN_WARNING
"%s: zero gso size.\n",
344 /* Header must be checked, and gso_segs computed. */
345 skb_shinfo(skb
)->gso_type
|= SKB_GSO_DODGY
;
346 skb_shinfo(skb
)->gso_segs
= 0;
349 netif_receive_skb(skb
);
353 dev
->stats
.rx_frame_errors
++;
357 static int add_recvbuf_small(struct virtnet_info
*vi
, gfp_t gfp
)
360 struct skb_vnet_hdr
*hdr
;
363 skb
= netdev_alloc_skb_ip_align(vi
->dev
, MAX_PACKET_LEN
);
367 skb_put(skb
, MAX_PACKET_LEN
);
369 hdr
= skb_vnet_hdr(skb
);
370 sg_set_buf(vi
->rx_sg
, &hdr
->hdr
, sizeof hdr
->hdr
);
372 skb_to_sgvec(skb
, vi
->rx_sg
+ 1, 0, skb
->len
);
374 err
= virtqueue_add_buf_gfp(vi
->rvq
, vi
->rx_sg
, 0, 2, skb
, gfp
);
381 static int add_recvbuf_big(struct virtnet_info
*vi
, gfp_t gfp
)
383 struct page
*first
, *list
= NULL
;
387 /* page in vi->rx_sg[MAX_SKB_FRAGS + 1] is list tail */
388 for (i
= MAX_SKB_FRAGS
+ 1; i
> 1; --i
) {
389 first
= get_a_page(vi
, gfp
);
392 give_pages(vi
, list
);
395 sg_set_buf(&vi
->rx_sg
[i
], page_address(first
), PAGE_SIZE
);
397 /* chain new page in list head to match sg */
398 first
->private = (unsigned long)list
;
402 first
= get_a_page(vi
, gfp
);
404 give_pages(vi
, list
);
407 p
= page_address(first
);
409 /* vi->rx_sg[0], vi->rx_sg[1] share the same page */
410 /* a separated vi->rx_sg[0] for virtio_net_hdr only due to QEMU bug */
411 sg_set_buf(&vi
->rx_sg
[0], p
, sizeof(struct virtio_net_hdr
));
413 /* vi->rx_sg[1] for data packet, from offset */
414 offset
= sizeof(struct padded_vnet_hdr
);
415 sg_set_buf(&vi
->rx_sg
[1], p
+ offset
, PAGE_SIZE
- offset
);
417 /* chain first in list head */
418 first
->private = (unsigned long)list
;
419 err
= virtqueue_add_buf_gfp(vi
->rvq
, vi
->rx_sg
, 0, MAX_SKB_FRAGS
+ 2,
422 give_pages(vi
, first
);
427 static int add_recvbuf_mergeable(struct virtnet_info
*vi
, gfp_t gfp
)
432 page
= get_a_page(vi
, gfp
);
436 sg_init_one(vi
->rx_sg
, page_address(page
), PAGE_SIZE
);
438 err
= virtqueue_add_buf_gfp(vi
->rvq
, vi
->rx_sg
, 0, 1, page
, gfp
);
440 give_pages(vi
, page
);
445 /* Returns false if we couldn't fill entirely (OOM). */
446 static bool try_fill_recv(struct virtnet_info
*vi
, gfp_t gfp
)
452 if (vi
->mergeable_rx_bufs
)
453 err
= add_recvbuf_mergeable(vi
, gfp
);
454 else if (vi
->big_packets
)
455 err
= add_recvbuf_big(vi
, gfp
);
457 err
= add_recvbuf_small(vi
, gfp
);
459 oom
= err
== -ENOMEM
;
464 if (unlikely(vi
->num
> vi
->max
))
466 virtqueue_kick(vi
->rvq
);
470 static void skb_recv_done(struct virtqueue
*rvq
)
472 struct virtnet_info
*vi
= rvq
->vdev
->priv
;
473 /* Schedule NAPI, Suppress further interrupts if successful. */
474 if (napi_schedule_prep(&vi
->napi
)) {
475 virtqueue_disable_cb(rvq
);
476 __napi_schedule(&vi
->napi
);
480 static void virtnet_napi_enable(struct virtnet_info
*vi
)
482 napi_enable(&vi
->napi
);
484 /* If all buffers were filled by other side before we napi_enabled, we
485 * won't get another interrupt, so process any outstanding packets
486 * now. virtnet_poll wants re-enable the queue, so we disable here.
487 * We synchronize against interrupts via NAPI_STATE_SCHED */
488 if (napi_schedule_prep(&vi
->napi
)) {
489 virtqueue_disable_cb(vi
->rvq
);
490 __napi_schedule(&vi
->napi
);
494 static void refill_work(struct work_struct
*work
)
496 struct virtnet_info
*vi
;
499 vi
= container_of(work
, struct virtnet_info
, refill
.work
);
500 napi_disable(&vi
->napi
);
501 still_empty
= !try_fill_recv(vi
, GFP_KERNEL
);
502 virtnet_napi_enable(vi
);
504 /* In theory, this can happen: if we don't get any buffers in
505 * we will *never* try to fill again. */
507 schedule_delayed_work(&vi
->refill
, HZ
/2);
510 static int virtnet_poll(struct napi_struct
*napi
, int budget
)
512 struct virtnet_info
*vi
= container_of(napi
, struct virtnet_info
, napi
);
514 unsigned int len
, received
= 0;
517 while (received
< budget
&&
518 (buf
= virtqueue_get_buf(vi
->rvq
, &len
)) != NULL
) {
519 receive_buf(vi
->dev
, buf
, len
);
524 if (vi
->num
< vi
->max
/ 2) {
525 if (!try_fill_recv(vi
, GFP_ATOMIC
))
526 schedule_delayed_work(&vi
->refill
, 0);
529 /* Out of packets? */
530 if (received
< budget
) {
532 if (unlikely(!virtqueue_enable_cb(vi
->rvq
)) &&
533 napi_schedule_prep(napi
)) {
534 virtqueue_disable_cb(vi
->rvq
);
535 __napi_schedule(napi
);
543 static unsigned int free_old_xmit_skbs(struct virtnet_info
*vi
)
546 unsigned int len
, tot_sgs
= 0;
547 struct virtnet_stats __percpu
*stats
= this_cpu_ptr(vi
->stats
);
549 while ((skb
= virtqueue_get_buf(vi
->svq
, &len
)) != NULL
) {
550 pr_debug("Sent skb %p\n", skb
);
552 u64_stats_update_begin(&stats
->syncp
);
553 stats
->tx_bytes
+= skb
->len
;
555 u64_stats_update_end(&stats
->syncp
);
557 tot_sgs
+= skb_vnet_hdr(skb
)->num_sg
;
558 dev_kfree_skb_any(skb
);
563 static int xmit_skb(struct virtnet_info
*vi
, struct sk_buff
*skb
)
565 struct skb_vnet_hdr
*hdr
= skb_vnet_hdr(skb
);
566 const unsigned char *dest
= ((struct ethhdr
*)skb
->data
)->h_dest
;
568 pr_debug("%s: xmit %p %pM\n", vi
->dev
->name
, skb
, dest
);
570 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
571 hdr
->hdr
.flags
= VIRTIO_NET_HDR_F_NEEDS_CSUM
;
572 hdr
->hdr
.csum_start
= skb_checksum_start_offset(skb
);
573 hdr
->hdr
.csum_offset
= skb
->csum_offset
;
576 hdr
->hdr
.csum_offset
= hdr
->hdr
.csum_start
= 0;
579 if (skb_is_gso(skb
)) {
580 hdr
->hdr
.hdr_len
= skb_headlen(skb
);
581 hdr
->hdr
.gso_size
= skb_shinfo(skb
)->gso_size
;
582 if (skb_shinfo(skb
)->gso_type
& SKB_GSO_TCPV4
)
583 hdr
->hdr
.gso_type
= VIRTIO_NET_HDR_GSO_TCPV4
;
584 else if (skb_shinfo(skb
)->gso_type
& SKB_GSO_TCPV6
)
585 hdr
->hdr
.gso_type
= VIRTIO_NET_HDR_GSO_TCPV6
;
586 else if (skb_shinfo(skb
)->gso_type
& SKB_GSO_UDP
)
587 hdr
->hdr
.gso_type
= VIRTIO_NET_HDR_GSO_UDP
;
590 if (skb_shinfo(skb
)->gso_type
& SKB_GSO_TCP_ECN
)
591 hdr
->hdr
.gso_type
|= VIRTIO_NET_HDR_GSO_ECN
;
593 hdr
->hdr
.gso_type
= VIRTIO_NET_HDR_GSO_NONE
;
594 hdr
->hdr
.gso_size
= hdr
->hdr
.hdr_len
= 0;
597 hdr
->mhdr
.num_buffers
= 0;
599 /* Encode metadata header at front. */
600 if (vi
->mergeable_rx_bufs
)
601 sg_set_buf(vi
->tx_sg
, &hdr
->mhdr
, sizeof hdr
->mhdr
);
603 sg_set_buf(vi
->tx_sg
, &hdr
->hdr
, sizeof hdr
->hdr
);
605 hdr
->num_sg
= skb_to_sgvec(skb
, vi
->tx_sg
+ 1, 0, skb
->len
) + 1;
606 return virtqueue_add_buf(vi
->svq
, vi
->tx_sg
, hdr
->num_sg
,
610 static netdev_tx_t
start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
612 struct virtnet_info
*vi
= netdev_priv(dev
);
615 /* Free up any pending old buffers before queueing new ones. */
616 free_old_xmit_skbs(vi
);
618 /* Try to transmit */
619 capacity
= xmit_skb(vi
, skb
);
621 /* This can happen with OOM and indirect buffers. */
622 if (unlikely(capacity
< 0)) {
623 if (net_ratelimit()) {
624 if (likely(capacity
== -ENOMEM
)) {
626 "TX queue failure: out of memory\n");
628 dev
->stats
.tx_fifo_errors
++;
630 "Unexpected TX queue failure: %d\n",
634 dev
->stats
.tx_dropped
++;
638 virtqueue_kick(vi
->svq
);
640 /* Don't wait up for transmitted skbs to be freed. */
644 /* Apparently nice girls don't return TX_BUSY; stop the queue
645 * before it gets out of hand. Naturally, this wastes entries. */
646 if (capacity
< 2+MAX_SKB_FRAGS
) {
647 netif_stop_queue(dev
);
648 if (unlikely(!virtqueue_enable_cb_delayed(vi
->svq
))) {
649 /* More just got used, free them then recheck. */
650 capacity
+= free_old_xmit_skbs(vi
);
651 if (capacity
>= 2+MAX_SKB_FRAGS
) {
652 netif_start_queue(dev
);
653 virtqueue_disable_cb(vi
->svq
);
661 static int virtnet_set_mac_address(struct net_device
*dev
, void *p
)
663 struct virtnet_info
*vi
= netdev_priv(dev
);
664 struct virtio_device
*vdev
= vi
->vdev
;
667 ret
= eth_mac_addr(dev
, p
);
671 if (virtio_has_feature(vdev
, VIRTIO_NET_F_MAC
))
672 vdev
->config
->set(vdev
, offsetof(struct virtio_net_config
, mac
),
673 dev
->dev_addr
, dev
->addr_len
);
678 static struct rtnl_link_stats64
*virtnet_stats(struct net_device
*dev
,
679 struct rtnl_link_stats64
*tot
)
681 struct virtnet_info
*vi
= netdev_priv(dev
);
685 for_each_possible_cpu(cpu
) {
686 struct virtnet_stats __percpu
*stats
687 = per_cpu_ptr(vi
->stats
, cpu
);
688 u64 tpackets
, tbytes
, rpackets
, rbytes
;
691 start
= u64_stats_fetch_begin(&stats
->syncp
);
692 tpackets
= stats
->tx_packets
;
693 tbytes
= stats
->tx_bytes
;
694 rpackets
= stats
->rx_packets
;
695 rbytes
= stats
->rx_bytes
;
696 } while (u64_stats_fetch_retry(&stats
->syncp
, start
));
698 tot
->rx_packets
+= rpackets
;
699 tot
->tx_packets
+= tpackets
;
700 tot
->rx_bytes
+= rbytes
;
701 tot
->tx_bytes
+= tbytes
;
704 tot
->tx_dropped
= dev
->stats
.tx_dropped
;
705 tot
->rx_dropped
= dev
->stats
.rx_dropped
;
706 tot
->rx_length_errors
= dev
->stats
.rx_length_errors
;
707 tot
->rx_frame_errors
= dev
->stats
.rx_frame_errors
;
712 #ifdef CONFIG_NET_POLL_CONTROLLER
713 static void virtnet_netpoll(struct net_device
*dev
)
715 struct virtnet_info
*vi
= netdev_priv(dev
);
717 napi_schedule(&vi
->napi
);
721 static int virtnet_open(struct net_device
*dev
)
723 struct virtnet_info
*vi
= netdev_priv(dev
);
725 virtnet_napi_enable(vi
);
730 * Send command via the control virtqueue and check status. Commands
731 * supported by the hypervisor, as indicated by feature bits, should
732 * never fail unless improperly formated.
734 static bool virtnet_send_command(struct virtnet_info
*vi
, u8
class, u8 cmd
,
735 struct scatterlist
*data
, int out
, int in
)
737 struct scatterlist
*s
, sg
[VIRTNET_SEND_COMMAND_SG_MAX
+ 2];
738 struct virtio_net_ctrl_hdr ctrl
;
739 virtio_net_ctrl_ack status
= ~0;
743 /* Caller should know better */
744 BUG_ON(!virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_VQ
) ||
745 (out
+ in
> VIRTNET_SEND_COMMAND_SG_MAX
));
747 out
++; /* Add header */
748 in
++; /* Add return status */
753 sg_init_table(sg
, out
+ in
);
755 sg_set_buf(&sg
[0], &ctrl
, sizeof(ctrl
));
756 for_each_sg(data
, s
, out
+ in
- 2, i
)
757 sg_set_buf(&sg
[i
+ 1], sg_virt(s
), s
->length
);
758 sg_set_buf(&sg
[out
+ in
- 1], &status
, sizeof(status
));
760 BUG_ON(virtqueue_add_buf(vi
->cvq
, sg
, out
, in
, vi
) < 0);
762 virtqueue_kick(vi
->cvq
);
765 * Spin for a response, the kick causes an ioport write, trapping
766 * into the hypervisor, so the request should be handled immediately.
768 while (!virtqueue_get_buf(vi
->cvq
, &tmp
))
771 return status
== VIRTIO_NET_OK
;
774 static int virtnet_close(struct net_device
*dev
)
776 struct virtnet_info
*vi
= netdev_priv(dev
);
778 napi_disable(&vi
->napi
);
783 static void virtnet_set_rx_mode(struct net_device
*dev
)
785 struct virtnet_info
*vi
= netdev_priv(dev
);
786 struct scatterlist sg
[2];
787 u8 promisc
, allmulti
;
788 struct virtio_net_ctrl_mac
*mac_data
;
789 struct netdev_hw_addr
*ha
;
795 /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */
796 if (!virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_RX
))
799 promisc
= ((dev
->flags
& IFF_PROMISC
) != 0);
800 allmulti
= ((dev
->flags
& IFF_ALLMULTI
) != 0);
802 sg_init_one(sg
, &promisc
, sizeof(promisc
));
804 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_RX
,
805 VIRTIO_NET_CTRL_RX_PROMISC
,
807 dev_warn(&dev
->dev
, "Failed to %sable promisc mode.\n",
808 promisc
? "en" : "dis");
810 sg_init_one(sg
, &allmulti
, sizeof(allmulti
));
812 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_RX
,
813 VIRTIO_NET_CTRL_RX_ALLMULTI
,
815 dev_warn(&dev
->dev
, "Failed to %sable allmulti mode.\n",
816 allmulti
? "en" : "dis");
818 uc_count
= netdev_uc_count(dev
);
819 mc_count
= netdev_mc_count(dev
);
820 /* MAC filter - use one buffer for both lists */
821 buf
= kzalloc(((uc_count
+ mc_count
) * ETH_ALEN
) +
822 (2 * sizeof(mac_data
->entries
)), GFP_ATOMIC
);
825 dev_warn(&dev
->dev
, "No memory for MAC address buffer\n");
829 sg_init_table(sg
, 2);
831 /* Store the unicast list and count in the front of the buffer */
832 mac_data
->entries
= uc_count
;
834 netdev_for_each_uc_addr(ha
, dev
)
835 memcpy(&mac_data
->macs
[i
++][0], ha
->addr
, ETH_ALEN
);
837 sg_set_buf(&sg
[0], mac_data
,
838 sizeof(mac_data
->entries
) + (uc_count
* ETH_ALEN
));
840 /* multicast list and count fill the end */
841 mac_data
= (void *)&mac_data
->macs
[uc_count
][0];
843 mac_data
->entries
= mc_count
;
845 netdev_for_each_mc_addr(ha
, dev
)
846 memcpy(&mac_data
->macs
[i
++][0], ha
->addr
, ETH_ALEN
);
848 sg_set_buf(&sg
[1], mac_data
,
849 sizeof(mac_data
->entries
) + (mc_count
* ETH_ALEN
));
851 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_MAC
,
852 VIRTIO_NET_CTRL_MAC_TABLE_SET
,
854 dev_warn(&dev
->dev
, "Failed to set MAC fitler table.\n");
859 static void virtnet_vlan_rx_add_vid(struct net_device
*dev
, u16 vid
)
861 struct virtnet_info
*vi
= netdev_priv(dev
);
862 struct scatterlist sg
;
864 sg_init_one(&sg
, &vid
, sizeof(vid
));
866 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_VLAN
,
867 VIRTIO_NET_CTRL_VLAN_ADD
, &sg
, 1, 0))
868 dev_warn(&dev
->dev
, "Failed to add VLAN ID %d.\n", vid
);
871 static void virtnet_vlan_rx_kill_vid(struct net_device
*dev
, u16 vid
)
873 struct virtnet_info
*vi
= netdev_priv(dev
);
874 struct scatterlist sg
;
876 sg_init_one(&sg
, &vid
, sizeof(vid
));
878 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_VLAN
,
879 VIRTIO_NET_CTRL_VLAN_DEL
, &sg
, 1, 0))
880 dev_warn(&dev
->dev
, "Failed to kill VLAN ID %d.\n", vid
);
883 static const struct ethtool_ops virtnet_ethtool_ops
= {
884 .get_link
= ethtool_op_get_link
,
888 #define MAX_MTU 65535
890 static int virtnet_change_mtu(struct net_device
*dev
, int new_mtu
)
892 if (new_mtu
< MIN_MTU
|| new_mtu
> MAX_MTU
)
898 static const struct net_device_ops virtnet_netdev
= {
899 .ndo_open
= virtnet_open
,
900 .ndo_stop
= virtnet_close
,
901 .ndo_start_xmit
= start_xmit
,
902 .ndo_validate_addr
= eth_validate_addr
,
903 .ndo_set_mac_address
= virtnet_set_mac_address
,
904 .ndo_set_rx_mode
= virtnet_set_rx_mode
,
905 .ndo_change_mtu
= virtnet_change_mtu
,
906 .ndo_get_stats64
= virtnet_stats
,
907 .ndo_vlan_rx_add_vid
= virtnet_vlan_rx_add_vid
,
908 .ndo_vlan_rx_kill_vid
= virtnet_vlan_rx_kill_vid
,
909 #ifdef CONFIG_NET_POLL_CONTROLLER
910 .ndo_poll_controller
= virtnet_netpoll
,
914 static void virtnet_update_status(struct virtnet_info
*vi
)
918 if (!virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_STATUS
))
921 vi
->vdev
->config
->get(vi
->vdev
,
922 offsetof(struct virtio_net_config
, status
),
925 /* Ignore unknown (future) status bits */
926 v
&= VIRTIO_NET_S_LINK_UP
;
933 if (vi
->status
& VIRTIO_NET_S_LINK_UP
) {
934 netif_carrier_on(vi
->dev
);
935 netif_wake_queue(vi
->dev
);
937 netif_carrier_off(vi
->dev
);
938 netif_stop_queue(vi
->dev
);
942 static void virtnet_config_changed(struct virtio_device
*vdev
)
944 struct virtnet_info
*vi
= vdev
->priv
;
946 virtnet_update_status(vi
);
949 static int virtnet_probe(struct virtio_device
*vdev
)
952 struct net_device
*dev
;
953 struct virtnet_info
*vi
;
954 struct virtqueue
*vqs
[3];
955 vq_callback_t
*callbacks
[] = { skb_recv_done
, skb_xmit_done
, NULL
};
956 const char *names
[] = { "input", "output", "control" };
959 /* Allocate ourselves a network device with room for our info */
960 dev
= alloc_etherdev(sizeof(struct virtnet_info
));
964 /* Set up network device as normal. */
965 dev
->priv_flags
|= IFF_UNICAST_FLT
;
966 dev
->netdev_ops
= &virtnet_netdev
;
967 dev
->features
= NETIF_F_HIGHDMA
;
969 SET_ETHTOOL_OPS(dev
, &virtnet_ethtool_ops
);
970 SET_NETDEV_DEV(dev
, &vdev
->dev
);
972 /* Do we support "hardware" checksums? */
973 if (virtio_has_feature(vdev
, VIRTIO_NET_F_CSUM
)) {
974 /* This opens up the world of extra features. */
975 dev
->hw_features
|= NETIF_F_HW_CSUM
|NETIF_F_SG
|NETIF_F_FRAGLIST
;
977 dev
->features
|= NETIF_F_HW_CSUM
|NETIF_F_SG
|NETIF_F_FRAGLIST
;
979 if (virtio_has_feature(vdev
, VIRTIO_NET_F_GSO
)) {
980 dev
->hw_features
|= NETIF_F_TSO
| NETIF_F_UFO
981 | NETIF_F_TSO_ECN
| NETIF_F_TSO6
;
983 /* Individual feature bits: what can host handle? */
984 if (virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_TSO4
))
985 dev
->hw_features
|= NETIF_F_TSO
;
986 if (virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_TSO6
))
987 dev
->hw_features
|= NETIF_F_TSO6
;
988 if (virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_ECN
))
989 dev
->hw_features
|= NETIF_F_TSO_ECN
;
990 if (virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_UFO
))
991 dev
->hw_features
|= NETIF_F_UFO
;
994 dev
->features
|= dev
->hw_features
& (NETIF_F_ALL_TSO
|NETIF_F_UFO
);
995 /* (!csum && gso) case will be fixed by register_netdev() */
998 /* Configuration may specify what MAC to use. Otherwise random. */
999 if (virtio_has_feature(vdev
, VIRTIO_NET_F_MAC
)) {
1000 vdev
->config
->get(vdev
,
1001 offsetof(struct virtio_net_config
, mac
),
1002 dev
->dev_addr
, dev
->addr_len
);
1004 random_ether_addr(dev
->dev_addr
);
1006 /* Set up our device-specific information */
1007 vi
= netdev_priv(dev
);
1008 netif_napi_add(dev
, &vi
->napi
, virtnet_poll
, napi_weight
);
1013 vi
->stats
= alloc_percpu(struct virtnet_stats
);
1015 if (vi
->stats
== NULL
)
1018 INIT_DELAYED_WORK(&vi
->refill
, refill_work
);
1019 sg_init_table(vi
->rx_sg
, ARRAY_SIZE(vi
->rx_sg
));
1020 sg_init_table(vi
->tx_sg
, ARRAY_SIZE(vi
->tx_sg
));
1022 /* If we can receive ANY GSO packets, we must allocate large ones. */
1023 if (virtio_has_feature(vdev
, VIRTIO_NET_F_GUEST_TSO4
) ||
1024 virtio_has_feature(vdev
, VIRTIO_NET_F_GUEST_TSO6
) ||
1025 virtio_has_feature(vdev
, VIRTIO_NET_F_GUEST_ECN
))
1026 vi
->big_packets
= true;
1028 if (virtio_has_feature(vdev
, VIRTIO_NET_F_MRG_RXBUF
))
1029 vi
->mergeable_rx_bufs
= true;
1031 /* We expect two virtqueues, receive then send,
1032 * and optionally control. */
1033 nvqs
= virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_VQ
) ? 3 : 2;
1035 err
= vdev
->config
->find_vqs(vdev
, nvqs
, vqs
, callbacks
, names
);
1042 if (virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_VQ
)) {
1045 if (virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_VLAN
))
1046 dev
->features
|= NETIF_F_HW_VLAN_FILTER
;
1049 err
= register_netdev(dev
);
1051 pr_debug("virtio_net: registering device failed\n");
1055 /* Last of all, set up some receive buffers. */
1056 try_fill_recv(vi
, GFP_KERNEL
);
1058 /* If we didn't even get one input buffer, we're useless. */
1064 /* Assume link up if device can't report link status,
1065 otherwise get link status from config. */
1066 if (virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_STATUS
)) {
1067 netif_carrier_off(dev
);
1068 virtnet_update_status(vi
);
1070 vi
->status
= VIRTIO_NET_S_LINK_UP
;
1071 netif_carrier_on(dev
);
1074 pr_debug("virtnet: registered device %s\n", dev
->name
);
1078 unregister_netdev(dev
);
1079 cancel_delayed_work_sync(&vi
->refill
);
1081 vdev
->config
->del_vqs(vdev
);
1083 free_percpu(vi
->stats
);
1089 static void free_unused_bufs(struct virtnet_info
*vi
)
1093 buf
= virtqueue_detach_unused_buf(vi
->svq
);
1099 buf
= virtqueue_detach_unused_buf(vi
->rvq
);
1102 if (vi
->mergeable_rx_bufs
|| vi
->big_packets
)
1103 give_pages(vi
, buf
);
1108 BUG_ON(vi
->num
!= 0);
1111 static void __devexit
virtnet_remove(struct virtio_device
*vdev
)
1113 struct virtnet_info
*vi
= vdev
->priv
;
1115 /* Stop all the virtqueues. */
1116 vdev
->config
->reset(vdev
);
1119 unregister_netdev(vi
->dev
);
1120 cancel_delayed_work_sync(&vi
->refill
);
1122 /* Free unused buffers in both send and recv, if any. */
1123 free_unused_bufs(vi
);
1125 vdev
->config
->del_vqs(vi
->vdev
);
1128 __free_pages(get_a_page(vi
, GFP_KERNEL
), 0);
1130 free_percpu(vi
->stats
);
1131 free_netdev(vi
->dev
);
1134 static struct virtio_device_id id_table
[] = {
1135 { VIRTIO_ID_NET
, VIRTIO_DEV_ANY_ID
},
1139 static unsigned int features
[] = {
1140 VIRTIO_NET_F_CSUM
, VIRTIO_NET_F_GUEST_CSUM
,
1141 VIRTIO_NET_F_GSO
, VIRTIO_NET_F_MAC
,
1142 VIRTIO_NET_F_HOST_TSO4
, VIRTIO_NET_F_HOST_UFO
, VIRTIO_NET_F_HOST_TSO6
,
1143 VIRTIO_NET_F_HOST_ECN
, VIRTIO_NET_F_GUEST_TSO4
, VIRTIO_NET_F_GUEST_TSO6
,
1144 VIRTIO_NET_F_GUEST_ECN
, VIRTIO_NET_F_GUEST_UFO
,
1145 VIRTIO_NET_F_MRG_RXBUF
, VIRTIO_NET_F_STATUS
, VIRTIO_NET_F_CTRL_VQ
,
1146 VIRTIO_NET_F_CTRL_RX
, VIRTIO_NET_F_CTRL_VLAN
,
1149 static struct virtio_driver virtio_net_driver
= {
1150 .feature_table
= features
,
1151 .feature_table_size
= ARRAY_SIZE(features
),
1152 .driver
.name
= KBUILD_MODNAME
,
1153 .driver
.owner
= THIS_MODULE
,
1154 .id_table
= id_table
,
1155 .probe
= virtnet_probe
,
1156 .remove
= __devexit_p(virtnet_remove
),
1157 .config_changed
= virtnet_config_changed
,
1160 static int __init
init(void)
1162 return register_virtio_driver(&virtio_net_driver
);
1165 static void __exit
fini(void)
1167 unregister_virtio_driver(&virtio_net_driver
);
1172 MODULE_DEVICE_TABLE(virtio
, id_table
);
1173 MODULE_DESCRIPTION("Virtio network driver");
1174 MODULE_LICENSE("GPL");