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>
29 #include <linux/cpu.h>
31 static int napi_weight
= NAPI_POLL_WEIGHT
;
32 module_param(napi_weight
, int, 0444);
34 static bool csum
= true, gso
= true;
35 module_param(csum
, bool, 0444);
36 module_param(gso
, bool, 0444);
38 /* FIXME: MTU in config. */
39 #define MAX_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN)
40 #define GOOD_COPY_LEN 128
42 #define VIRTNET_DRIVER_VERSION "1.0.0"
44 struct virtnet_stats
{
45 struct u64_stats_sync tx_syncp
;
46 struct u64_stats_sync rx_syncp
;
54 /* Internal representation of a send virtqueue */
56 /* Virtqueue associated with this send _queue */
59 /* TX: fragments + linear part + virtio header */
60 struct scatterlist sg
[MAX_SKB_FRAGS
+ 2];
62 /* Name of the send queue: output.$index */
66 /* Internal representation of a receive virtqueue */
67 struct receive_queue
{
68 /* Virtqueue associated with this receive_queue */
71 struct napi_struct napi
;
73 /* Number of input buffers, and max we've ever had. */
74 unsigned int num
, max
;
76 /* Chain pages by the private ptr. */
79 /* RX: fragments + linear part + virtio header */
80 struct scatterlist sg
[MAX_SKB_FRAGS
+ 2];
82 /* Name of this receive queue: input.$index */
87 struct virtio_device
*vdev
;
88 struct virtqueue
*cvq
;
89 struct net_device
*dev
;
90 struct send_queue
*sq
;
91 struct receive_queue
*rq
;
94 /* Max # of queue pairs supported by the device */
97 /* # of queue pairs currently used by the driver */
100 /* I like... big packets and I cannot lie! */
103 /* Host will merge rx buffers for big packets (shake it! shake it!) */
104 bool mergeable_rx_bufs
;
106 /* Has control virtqueue */
109 /* Host can handle any s/g split between our header and packet data */
112 /* enable config space updates */
115 /* Active statistics */
116 struct virtnet_stats __percpu
*stats
;
118 /* Work struct for refilling if we run low on memory. */
119 struct delayed_work refill
;
121 /* Work struct for config space updates */
122 struct work_struct config_work
;
124 /* Lock for config space updates */
125 struct mutex config_lock
;
127 /* Page_frag for GFP_KERNEL packet buffer allocation when we run
130 struct page_frag alloc_frag
;
132 /* Does the affinity hint is set for virtqueues? */
133 bool affinity_hint_set
;
135 /* CPU hot plug notifier */
136 struct notifier_block nb
;
139 struct skb_vnet_hdr
{
141 struct virtio_net_hdr hdr
;
142 struct virtio_net_hdr_mrg_rxbuf mhdr
;
146 struct padded_vnet_hdr
{
147 struct virtio_net_hdr hdr
;
149 * virtio_net_hdr should be in a separated sg buffer because of a
150 * QEMU bug, and data sg buffer shares same page with this header sg.
151 * This padding makes next sg 16 byte aligned after virtio_net_hdr.
156 /* Converting between virtqueue no. and kernel tx/rx queue no.
157 * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq
159 static int vq2txq(struct virtqueue
*vq
)
161 return (vq
->index
- 1) / 2;
164 static int txq2vq(int txq
)
169 static int vq2rxq(struct virtqueue
*vq
)
171 return vq
->index
/ 2;
174 static int rxq2vq(int rxq
)
179 static inline struct skb_vnet_hdr
*skb_vnet_hdr(struct sk_buff
*skb
)
181 return (struct skb_vnet_hdr
*)skb
->cb
;
185 * private is used to chain pages for big packets, put the whole
186 * most recent used list in the beginning for reuse
188 static void give_pages(struct receive_queue
*rq
, struct page
*page
)
192 /* Find end of list, sew whole thing into vi->rq.pages. */
193 for (end
= page
; end
->private; end
= (struct page
*)end
->private);
194 end
->private = (unsigned long)rq
->pages
;
198 static struct page
*get_a_page(struct receive_queue
*rq
, gfp_t gfp_mask
)
200 struct page
*p
= rq
->pages
;
203 rq
->pages
= (struct page
*)p
->private;
204 /* clear private here, it is used to chain pages */
207 p
= alloc_page(gfp_mask
);
211 static void skb_xmit_done(struct virtqueue
*vq
)
213 struct virtnet_info
*vi
= vq
->vdev
->priv
;
215 /* Suppress further interrupts. */
216 virtqueue_disable_cb(vq
);
218 /* We were probably waiting for more output buffers. */
219 netif_wake_subqueue(vi
->dev
, vq2txq(vq
));
222 /* Called from bottom half context */
223 static struct sk_buff
*page_to_skb(struct receive_queue
*rq
,
224 struct page
*page
, unsigned int offset
,
225 unsigned int len
, unsigned int truesize
)
227 struct virtnet_info
*vi
= rq
->vq
->vdev
->priv
;
229 struct skb_vnet_hdr
*hdr
;
230 unsigned int copy
, hdr_len
, hdr_padded_len
;
233 p
= page_address(page
) + offset
;
235 /* copy small packet so we can reuse these pages for small data */
236 skb
= netdev_alloc_skb_ip_align(vi
->dev
, GOOD_COPY_LEN
);
240 hdr
= skb_vnet_hdr(skb
);
242 if (vi
->mergeable_rx_bufs
) {
243 hdr_len
= sizeof hdr
->mhdr
;
244 hdr_padded_len
= sizeof hdr
->mhdr
;
246 hdr_len
= sizeof hdr
->hdr
;
247 hdr_padded_len
= sizeof(struct padded_vnet_hdr
);
250 memcpy(hdr
, p
, hdr_len
);
253 offset
+= hdr_padded_len
;
257 if (copy
> skb_tailroom(skb
))
258 copy
= skb_tailroom(skb
);
259 memcpy(skb_put(skb
, copy
), p
, copy
);
264 if (vi
->mergeable_rx_bufs
) {
266 skb_add_rx_frag(skb
, 0, page
, offset
, len
, truesize
);
273 * Verify that we can indeed put this data into a skb.
274 * This is here to handle cases when the device erroneously
275 * tries to receive more than is possible. This is usually
276 * the case of a broken device.
278 if (unlikely(len
> MAX_SKB_FRAGS
* PAGE_SIZE
)) {
279 net_dbg_ratelimited("%s: too much data\n", skb
->dev
->name
);
283 BUG_ON(offset
>= PAGE_SIZE
);
285 unsigned int frag_size
= min((unsigned)PAGE_SIZE
- offset
, len
);
286 skb_add_rx_frag(skb
, skb_shinfo(skb
)->nr_frags
, page
, offset
,
287 frag_size
, truesize
);
289 page
= (struct page
*)page
->private;
294 give_pages(rq
, page
);
299 static int receive_mergeable(struct receive_queue
*rq
, struct sk_buff
*head_skb
)
301 struct skb_vnet_hdr
*hdr
= skb_vnet_hdr(head_skb
);
302 struct sk_buff
*curr_skb
= head_skb
;
305 int num_buf
, len
, offset
;
307 num_buf
= hdr
->mhdr
.num_buffers
;
309 int num_skb_frags
= skb_shinfo(curr_skb
)->nr_frags
;
310 buf
= virtqueue_get_buf(rq
->vq
, &len
);
311 if (unlikely(!buf
)) {
312 pr_debug("%s: rx error: %d buffers missing\n",
313 head_skb
->dev
->name
, hdr
->mhdr
.num_buffers
);
314 head_skb
->dev
->stats
.rx_length_errors
++;
317 if (unlikely(len
> MAX_PACKET_LEN
)) {
318 pr_debug("%s: rx error: merge buffer too long\n",
319 head_skb
->dev
->name
);
320 len
= MAX_PACKET_LEN
;
322 if (unlikely(num_skb_frags
== MAX_SKB_FRAGS
)) {
323 struct sk_buff
*nskb
= alloc_skb(0, GFP_ATOMIC
);
324 if (unlikely(!nskb
)) {
325 head_skb
->dev
->stats
.rx_dropped
++;
328 if (curr_skb
== head_skb
)
329 skb_shinfo(curr_skb
)->frag_list
= nskb
;
331 curr_skb
->next
= nskb
;
333 head_skb
->truesize
+= nskb
->truesize
;
336 if (curr_skb
!= head_skb
) {
337 head_skb
->data_len
+= len
;
338 head_skb
->len
+= len
;
339 head_skb
->truesize
+= MAX_PACKET_LEN
;
341 page
= virt_to_head_page(buf
);
342 offset
= buf
- (char *)page_address(page
);
343 if (skb_can_coalesce(curr_skb
, num_skb_frags
, page
, offset
)) {
345 skb_coalesce_rx_frag(curr_skb
, num_skb_frags
- 1,
346 len
, MAX_PACKET_LEN
);
348 skb_add_rx_frag(curr_skb
, num_skb_frags
, page
,
357 static void receive_buf(struct receive_queue
*rq
, void *buf
, unsigned int len
)
359 struct virtnet_info
*vi
= rq
->vq
->vdev
->priv
;
360 struct net_device
*dev
= vi
->dev
;
361 struct virtnet_stats
*stats
= this_cpu_ptr(vi
->stats
);
364 struct skb_vnet_hdr
*hdr
;
366 if (unlikely(len
< sizeof(struct virtio_net_hdr
) + ETH_HLEN
)) {
367 pr_debug("%s: short packet %i\n", dev
->name
, len
);
368 dev
->stats
.rx_length_errors
++;
371 else if (vi
->mergeable_rx_bufs
)
372 put_page(virt_to_head_page(buf
));
378 if (!vi
->mergeable_rx_bufs
&& !vi
->big_packets
) {
380 len
-= sizeof(struct virtio_net_hdr
);
382 } else if (vi
->mergeable_rx_bufs
) {
383 struct page
*page
= virt_to_head_page(buf
);
384 skb
= page_to_skb(rq
, page
,
385 (char *)buf
- (char *)page_address(page
),
386 len
, MAX_PACKET_LEN
);
387 if (unlikely(!skb
)) {
388 dev
->stats
.rx_dropped
++;
392 if (receive_mergeable(rq
, skb
)) {
398 skb
= page_to_skb(rq
, page
, 0, len
, PAGE_SIZE
);
399 if (unlikely(!skb
)) {
400 dev
->stats
.rx_dropped
++;
401 give_pages(rq
, page
);
406 hdr
= skb_vnet_hdr(skb
);
408 u64_stats_update_begin(&stats
->rx_syncp
);
409 stats
->rx_bytes
+= skb
->len
;
411 u64_stats_update_end(&stats
->rx_syncp
);
413 if (hdr
->hdr
.flags
& VIRTIO_NET_HDR_F_NEEDS_CSUM
) {
414 pr_debug("Needs csum!\n");
415 if (!skb_partial_csum_set(skb
,
417 hdr
->hdr
.csum_offset
))
419 } else if (hdr
->hdr
.flags
& VIRTIO_NET_HDR_F_DATA_VALID
) {
420 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
423 skb
->protocol
= eth_type_trans(skb
, dev
);
424 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
425 ntohs(skb
->protocol
), skb
->len
, skb
->pkt_type
);
427 if (hdr
->hdr
.gso_type
!= VIRTIO_NET_HDR_GSO_NONE
) {
429 switch (hdr
->hdr
.gso_type
& ~VIRTIO_NET_HDR_GSO_ECN
) {
430 case VIRTIO_NET_HDR_GSO_TCPV4
:
431 skb_shinfo(skb
)->gso_type
= SKB_GSO_TCPV4
;
433 case VIRTIO_NET_HDR_GSO_UDP
:
434 skb_shinfo(skb
)->gso_type
= SKB_GSO_UDP
;
436 case VIRTIO_NET_HDR_GSO_TCPV6
:
437 skb_shinfo(skb
)->gso_type
= SKB_GSO_TCPV6
;
440 net_warn_ratelimited("%s: bad gso type %u.\n",
441 dev
->name
, hdr
->hdr
.gso_type
);
445 if (hdr
->hdr
.gso_type
& VIRTIO_NET_HDR_GSO_ECN
)
446 skb_shinfo(skb
)->gso_type
|= SKB_GSO_TCP_ECN
;
448 skb_shinfo(skb
)->gso_size
= hdr
->hdr
.gso_size
;
449 if (skb_shinfo(skb
)->gso_size
== 0) {
450 net_warn_ratelimited("%s: zero gso size.\n", dev
->name
);
454 /* Header must be checked, and gso_segs computed. */
455 skb_shinfo(skb
)->gso_type
|= SKB_GSO_DODGY
;
456 skb_shinfo(skb
)->gso_segs
= 0;
459 netif_receive_skb(skb
);
463 dev
->stats
.rx_frame_errors
++;
467 static int add_recvbuf_small(struct receive_queue
*rq
, gfp_t gfp
)
469 struct virtnet_info
*vi
= rq
->vq
->vdev
->priv
;
471 struct skb_vnet_hdr
*hdr
;
474 skb
= __netdev_alloc_skb_ip_align(vi
->dev
, MAX_PACKET_LEN
, gfp
);
478 skb_put(skb
, MAX_PACKET_LEN
);
480 hdr
= skb_vnet_hdr(skb
);
481 sg_set_buf(rq
->sg
, &hdr
->hdr
, sizeof hdr
->hdr
);
483 skb_to_sgvec(skb
, rq
->sg
+ 1, 0, skb
->len
);
485 err
= virtqueue_add_inbuf(rq
->vq
, rq
->sg
, 2, skb
, gfp
);
492 static int add_recvbuf_big(struct receive_queue
*rq
, gfp_t gfp
)
494 struct page
*first
, *list
= NULL
;
498 /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */
499 for (i
= MAX_SKB_FRAGS
+ 1; i
> 1; --i
) {
500 first
= get_a_page(rq
, gfp
);
503 give_pages(rq
, list
);
506 sg_set_buf(&rq
->sg
[i
], page_address(first
), PAGE_SIZE
);
508 /* chain new page in list head to match sg */
509 first
->private = (unsigned long)list
;
513 first
= get_a_page(rq
, gfp
);
515 give_pages(rq
, list
);
518 p
= page_address(first
);
520 /* rq->sg[0], rq->sg[1] share the same page */
521 /* a separated rq->sg[0] for virtio_net_hdr only due to QEMU bug */
522 sg_set_buf(&rq
->sg
[0], p
, sizeof(struct virtio_net_hdr
));
524 /* rq->sg[1] for data packet, from offset */
525 offset
= sizeof(struct padded_vnet_hdr
);
526 sg_set_buf(&rq
->sg
[1], p
+ offset
, PAGE_SIZE
- offset
);
528 /* chain first in list head */
529 first
->private = (unsigned long)list
;
530 err
= virtqueue_add_inbuf(rq
->vq
, rq
->sg
, MAX_SKB_FRAGS
+ 2,
533 give_pages(rq
, first
);
538 static int add_recvbuf_mergeable(struct receive_queue
*rq
, gfp_t gfp
)
540 struct virtnet_info
*vi
= rq
->vq
->vdev
->priv
;
544 if (gfp
& __GFP_WAIT
) {
545 if (skb_page_frag_refill(MAX_PACKET_LEN
, &vi
->alloc_frag
,
547 buf
= (char *)page_address(vi
->alloc_frag
.page
) +
548 vi
->alloc_frag
.offset
;
549 get_page(vi
->alloc_frag
.page
);
550 vi
->alloc_frag
.offset
+= MAX_PACKET_LEN
;
553 buf
= netdev_alloc_frag(MAX_PACKET_LEN
);
558 sg_init_one(rq
->sg
, buf
, MAX_PACKET_LEN
);
559 err
= virtqueue_add_inbuf(rq
->vq
, rq
->sg
, 1, buf
, gfp
);
561 put_page(virt_to_head_page(buf
));
567 * Returns false if we couldn't fill entirely (OOM).
569 * Normally run in the receive path, but can also be run from ndo_open
570 * before we're receiving packets, or from refill_work which is
571 * careful to disable receiving (using napi_disable).
573 static bool try_fill_recv(struct receive_queue
*rq
, gfp_t gfp
)
575 struct virtnet_info
*vi
= rq
->vq
->vdev
->priv
;
580 if (vi
->mergeable_rx_bufs
)
581 err
= add_recvbuf_mergeable(rq
, gfp
);
582 else if (vi
->big_packets
)
583 err
= add_recvbuf_big(rq
, gfp
);
585 err
= add_recvbuf_small(rq
, gfp
);
587 oom
= err
== -ENOMEM
;
591 } while (rq
->vq
->num_free
);
592 if (unlikely(rq
->num
> rq
->max
))
594 virtqueue_kick(rq
->vq
);
598 static void skb_recv_done(struct virtqueue
*rvq
)
600 struct virtnet_info
*vi
= rvq
->vdev
->priv
;
601 struct receive_queue
*rq
= &vi
->rq
[vq2rxq(rvq
)];
603 /* Schedule NAPI, Suppress further interrupts if successful. */
604 if (napi_schedule_prep(&rq
->napi
)) {
605 virtqueue_disable_cb(rvq
);
606 __napi_schedule(&rq
->napi
);
610 static void virtnet_napi_enable(struct receive_queue
*rq
)
612 napi_enable(&rq
->napi
);
614 /* If all buffers were filled by other side before we napi_enabled, we
615 * won't get another interrupt, so process any outstanding packets
616 * now. virtnet_poll wants re-enable the queue, so we disable here.
617 * We synchronize against interrupts via NAPI_STATE_SCHED */
618 if (napi_schedule_prep(&rq
->napi
)) {
619 virtqueue_disable_cb(rq
->vq
);
621 __napi_schedule(&rq
->napi
);
626 static void refill_work(struct work_struct
*work
)
628 struct virtnet_info
*vi
=
629 container_of(work
, struct virtnet_info
, refill
.work
);
633 for (i
= 0; i
< vi
->curr_queue_pairs
; i
++) {
634 struct receive_queue
*rq
= &vi
->rq
[i
];
636 napi_disable(&rq
->napi
);
637 still_empty
= !try_fill_recv(rq
, GFP_KERNEL
);
638 virtnet_napi_enable(rq
);
640 /* In theory, this can happen: if we don't get any buffers in
641 * we will *never* try to fill again.
644 schedule_delayed_work(&vi
->refill
, HZ
/2);
648 static int virtnet_poll(struct napi_struct
*napi
, int budget
)
650 struct receive_queue
*rq
=
651 container_of(napi
, struct receive_queue
, napi
);
652 struct virtnet_info
*vi
= rq
->vq
->vdev
->priv
;
654 unsigned int r
, len
, received
= 0;
657 while (received
< budget
&&
658 (buf
= virtqueue_get_buf(rq
->vq
, &len
)) != NULL
) {
659 receive_buf(rq
, buf
, len
);
664 if (rq
->num
< rq
->max
/ 2) {
665 if (!try_fill_recv(rq
, GFP_ATOMIC
))
666 schedule_delayed_work(&vi
->refill
, 0);
669 /* Out of packets? */
670 if (received
< budget
) {
671 r
= virtqueue_enable_cb_prepare(rq
->vq
);
673 if (unlikely(virtqueue_poll(rq
->vq
, r
)) &&
674 napi_schedule_prep(napi
)) {
675 virtqueue_disable_cb(rq
->vq
);
676 __napi_schedule(napi
);
684 static int virtnet_open(struct net_device
*dev
)
686 struct virtnet_info
*vi
= netdev_priv(dev
);
689 for (i
= 0; i
< vi
->max_queue_pairs
; i
++) {
690 if (i
< vi
->curr_queue_pairs
)
691 /* Make sure we have some buffers: if oom use wq. */
692 if (!try_fill_recv(&vi
->rq
[i
], GFP_KERNEL
))
693 schedule_delayed_work(&vi
->refill
, 0);
694 virtnet_napi_enable(&vi
->rq
[i
]);
700 static void free_old_xmit_skbs(struct send_queue
*sq
)
704 struct virtnet_info
*vi
= sq
->vq
->vdev
->priv
;
705 struct virtnet_stats
*stats
= this_cpu_ptr(vi
->stats
);
707 while ((skb
= virtqueue_get_buf(sq
->vq
, &len
)) != NULL
) {
708 pr_debug("Sent skb %p\n", skb
);
710 u64_stats_update_begin(&stats
->tx_syncp
);
711 stats
->tx_bytes
+= skb
->len
;
713 u64_stats_update_end(&stats
->tx_syncp
);
715 dev_kfree_skb_any(skb
);
719 static int xmit_skb(struct send_queue
*sq
, struct sk_buff
*skb
)
721 struct skb_vnet_hdr
*hdr
;
722 const unsigned char *dest
= ((struct ethhdr
*)skb
->data
)->h_dest
;
723 struct virtnet_info
*vi
= sq
->vq
->vdev
->priv
;
728 pr_debug("%s: xmit %p %pM\n", vi
->dev
->name
, skb
, dest
);
729 if (vi
->mergeable_rx_bufs
)
730 hdr_len
= sizeof hdr
->mhdr
;
732 hdr_len
= sizeof hdr
->hdr
;
734 can_push
= vi
->any_header_sg
&&
735 !((unsigned long)skb
->data
& (__alignof__(*hdr
) - 1)) &&
736 !skb_header_cloned(skb
) && skb_headroom(skb
) >= hdr_len
;
737 /* Even if we can, don't push here yet as this would skew
738 * csum_start offset below. */
740 hdr
= (struct skb_vnet_hdr
*)(skb
->data
- hdr_len
);
742 hdr
= skb_vnet_hdr(skb
);
744 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
745 hdr
->hdr
.flags
= VIRTIO_NET_HDR_F_NEEDS_CSUM
;
746 hdr
->hdr
.csum_start
= skb_checksum_start_offset(skb
);
747 hdr
->hdr
.csum_offset
= skb
->csum_offset
;
750 hdr
->hdr
.csum_offset
= hdr
->hdr
.csum_start
= 0;
753 if (skb_is_gso(skb
)) {
754 hdr
->hdr
.hdr_len
= skb_headlen(skb
);
755 hdr
->hdr
.gso_size
= skb_shinfo(skb
)->gso_size
;
756 if (skb_shinfo(skb
)->gso_type
& SKB_GSO_TCPV4
)
757 hdr
->hdr
.gso_type
= VIRTIO_NET_HDR_GSO_TCPV4
;
758 else if (skb_shinfo(skb
)->gso_type
& SKB_GSO_TCPV6
)
759 hdr
->hdr
.gso_type
= VIRTIO_NET_HDR_GSO_TCPV6
;
760 else if (skb_shinfo(skb
)->gso_type
& SKB_GSO_UDP
)
761 hdr
->hdr
.gso_type
= VIRTIO_NET_HDR_GSO_UDP
;
764 if (skb_shinfo(skb
)->gso_type
& SKB_GSO_TCP_ECN
)
765 hdr
->hdr
.gso_type
|= VIRTIO_NET_HDR_GSO_ECN
;
767 hdr
->hdr
.gso_type
= VIRTIO_NET_HDR_GSO_NONE
;
768 hdr
->hdr
.gso_size
= hdr
->hdr
.hdr_len
= 0;
771 if (vi
->mergeable_rx_bufs
)
772 hdr
->mhdr
.num_buffers
= 0;
775 __skb_push(skb
, hdr_len
);
776 num_sg
= skb_to_sgvec(skb
, sq
->sg
, 0, skb
->len
);
777 /* Pull header back to avoid skew in tx bytes calculations. */
778 __skb_pull(skb
, hdr_len
);
780 sg_set_buf(sq
->sg
, hdr
, hdr_len
);
781 num_sg
= skb_to_sgvec(skb
, sq
->sg
+ 1, 0, skb
->len
) + 1;
783 return virtqueue_add_outbuf(sq
->vq
, sq
->sg
, num_sg
, skb
, GFP_ATOMIC
);
786 static netdev_tx_t
start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
788 struct virtnet_info
*vi
= netdev_priv(dev
);
789 int qnum
= skb_get_queue_mapping(skb
);
790 struct send_queue
*sq
= &vi
->sq
[qnum
];
793 /* Free up any pending old buffers before queueing new ones. */
794 free_old_xmit_skbs(sq
);
796 /* Try to transmit */
797 err
= xmit_skb(sq
, skb
);
799 /* This should not happen! */
801 dev
->stats
.tx_fifo_errors
++;
804 "Unexpected TXQ (%d) queue failure: %d\n", qnum
, err
);
805 dev
->stats
.tx_dropped
++;
809 virtqueue_kick(sq
->vq
);
811 /* Don't wait up for transmitted skbs to be freed. */
815 /* Apparently nice girls don't return TX_BUSY; stop the queue
816 * before it gets out of hand. Naturally, this wastes entries. */
817 if (sq
->vq
->num_free
< 2+MAX_SKB_FRAGS
) {
818 netif_stop_subqueue(dev
, qnum
);
819 if (unlikely(!virtqueue_enable_cb_delayed(sq
->vq
))) {
820 /* More just got used, free them then recheck. */
821 free_old_xmit_skbs(sq
);
822 if (sq
->vq
->num_free
>= 2+MAX_SKB_FRAGS
) {
823 netif_start_subqueue(dev
, qnum
);
824 virtqueue_disable_cb(sq
->vq
);
833 * Send command via the control virtqueue and check status. Commands
834 * supported by the hypervisor, as indicated by feature bits, should
835 * never fail unless improperly formated.
837 static bool virtnet_send_command(struct virtnet_info
*vi
, u8
class, u8 cmd
,
838 struct scatterlist
*out
,
839 struct scatterlist
*in
)
841 struct scatterlist
*sgs
[4], hdr
, stat
;
842 struct virtio_net_ctrl_hdr ctrl
;
843 virtio_net_ctrl_ack status
= ~0;
844 unsigned out_num
= 0, in_num
= 0, tmp
;
846 /* Caller should know better */
847 BUG_ON(!virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_VQ
));
852 sg_init_one(&hdr
, &ctrl
, sizeof(ctrl
));
853 sgs
[out_num
++] = &hdr
;
856 sgs
[out_num
++] = out
;
858 sgs
[out_num
+ in_num
++] = in
;
860 /* Add return status. */
861 sg_init_one(&stat
, &status
, sizeof(status
));
862 sgs
[out_num
+ in_num
++] = &stat
;
864 BUG_ON(out_num
+ in_num
> ARRAY_SIZE(sgs
));
865 BUG_ON(virtqueue_add_sgs(vi
->cvq
, sgs
, out_num
, in_num
, vi
, GFP_ATOMIC
)
868 virtqueue_kick(vi
->cvq
);
870 /* Spin for a response, the kick causes an ioport write, trapping
871 * into the hypervisor, so the request should be handled immediately.
873 while (!virtqueue_get_buf(vi
->cvq
, &tmp
))
876 return status
== VIRTIO_NET_OK
;
879 static int virtnet_set_mac_address(struct net_device
*dev
, void *p
)
881 struct virtnet_info
*vi
= netdev_priv(dev
);
882 struct virtio_device
*vdev
= vi
->vdev
;
884 struct sockaddr
*addr
= p
;
885 struct scatterlist sg
;
887 ret
= eth_prepare_mac_addr_change(dev
, p
);
891 if (virtio_has_feature(vdev
, VIRTIO_NET_F_CTRL_MAC_ADDR
)) {
892 sg_init_one(&sg
, addr
->sa_data
, dev
->addr_len
);
893 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_MAC
,
894 VIRTIO_NET_CTRL_MAC_ADDR_SET
,
897 "Failed to set mac address by vq command.\n");
900 } else if (virtio_has_feature(vdev
, VIRTIO_NET_F_MAC
)) {
901 vdev
->config
->set(vdev
, offsetof(struct virtio_net_config
, mac
),
902 addr
->sa_data
, dev
->addr_len
);
905 eth_commit_mac_addr_change(dev
, p
);
910 static struct rtnl_link_stats64
*virtnet_stats(struct net_device
*dev
,
911 struct rtnl_link_stats64
*tot
)
913 struct virtnet_info
*vi
= netdev_priv(dev
);
917 for_each_possible_cpu(cpu
) {
918 struct virtnet_stats
*stats
= per_cpu_ptr(vi
->stats
, cpu
);
919 u64 tpackets
, tbytes
, rpackets
, rbytes
;
922 start
= u64_stats_fetch_begin_bh(&stats
->tx_syncp
);
923 tpackets
= stats
->tx_packets
;
924 tbytes
= stats
->tx_bytes
;
925 } while (u64_stats_fetch_retry_bh(&stats
->tx_syncp
, start
));
928 start
= u64_stats_fetch_begin_bh(&stats
->rx_syncp
);
929 rpackets
= stats
->rx_packets
;
930 rbytes
= stats
->rx_bytes
;
931 } while (u64_stats_fetch_retry_bh(&stats
->rx_syncp
, start
));
933 tot
->rx_packets
+= rpackets
;
934 tot
->tx_packets
+= tpackets
;
935 tot
->rx_bytes
+= rbytes
;
936 tot
->tx_bytes
+= tbytes
;
939 tot
->tx_dropped
= dev
->stats
.tx_dropped
;
940 tot
->tx_fifo_errors
= dev
->stats
.tx_fifo_errors
;
941 tot
->rx_dropped
= dev
->stats
.rx_dropped
;
942 tot
->rx_length_errors
= dev
->stats
.rx_length_errors
;
943 tot
->rx_frame_errors
= dev
->stats
.rx_frame_errors
;
948 #ifdef CONFIG_NET_POLL_CONTROLLER
949 static void virtnet_netpoll(struct net_device
*dev
)
951 struct virtnet_info
*vi
= netdev_priv(dev
);
954 for (i
= 0; i
< vi
->curr_queue_pairs
; i
++)
955 napi_schedule(&vi
->rq
[i
].napi
);
959 static void virtnet_ack_link_announce(struct virtnet_info
*vi
)
962 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_ANNOUNCE
,
963 VIRTIO_NET_CTRL_ANNOUNCE_ACK
, NULL
, NULL
))
964 dev_warn(&vi
->dev
->dev
, "Failed to ack link announce.\n");
968 static int virtnet_set_queues(struct virtnet_info
*vi
, u16 queue_pairs
)
970 struct scatterlist sg
;
971 struct virtio_net_ctrl_mq s
;
972 struct net_device
*dev
= vi
->dev
;
974 if (!vi
->has_cvq
|| !virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_MQ
))
977 s
.virtqueue_pairs
= queue_pairs
;
978 sg_init_one(&sg
, &s
, sizeof(s
));
980 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_MQ
,
981 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET
, &sg
, NULL
)) {
982 dev_warn(&dev
->dev
, "Fail to set num of queue pairs to %d\n",
986 vi
->curr_queue_pairs
= queue_pairs
;
987 /* virtnet_open() will refill when device is going to up. */
988 if (dev
->flags
& IFF_UP
)
989 schedule_delayed_work(&vi
->refill
, 0);
995 static int virtnet_close(struct net_device
*dev
)
997 struct virtnet_info
*vi
= netdev_priv(dev
);
1000 /* Make sure refill_work doesn't re-enable napi! */
1001 cancel_delayed_work_sync(&vi
->refill
);
1003 for (i
= 0; i
< vi
->max_queue_pairs
; i
++)
1004 napi_disable(&vi
->rq
[i
].napi
);
1009 static void virtnet_set_rx_mode(struct net_device
*dev
)
1011 struct virtnet_info
*vi
= netdev_priv(dev
);
1012 struct scatterlist sg
[2];
1013 u8 promisc
, allmulti
;
1014 struct virtio_net_ctrl_mac
*mac_data
;
1015 struct netdev_hw_addr
*ha
;
1021 /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */
1022 if (!virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_RX
))
1025 promisc
= ((dev
->flags
& IFF_PROMISC
) != 0);
1026 allmulti
= ((dev
->flags
& IFF_ALLMULTI
) != 0);
1028 sg_init_one(sg
, &promisc
, sizeof(promisc
));
1030 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_RX
,
1031 VIRTIO_NET_CTRL_RX_PROMISC
,
1033 dev_warn(&dev
->dev
, "Failed to %sable promisc mode.\n",
1034 promisc
? "en" : "dis");
1036 sg_init_one(sg
, &allmulti
, sizeof(allmulti
));
1038 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_RX
,
1039 VIRTIO_NET_CTRL_RX_ALLMULTI
,
1041 dev_warn(&dev
->dev
, "Failed to %sable allmulti mode.\n",
1042 allmulti
? "en" : "dis");
1044 uc_count
= netdev_uc_count(dev
);
1045 mc_count
= netdev_mc_count(dev
);
1046 /* MAC filter - use one buffer for both lists */
1047 buf
= kzalloc(((uc_count
+ mc_count
) * ETH_ALEN
) +
1048 (2 * sizeof(mac_data
->entries
)), GFP_ATOMIC
);
1053 sg_init_table(sg
, 2);
1055 /* Store the unicast list and count in the front of the buffer */
1056 mac_data
->entries
= uc_count
;
1058 netdev_for_each_uc_addr(ha
, dev
)
1059 memcpy(&mac_data
->macs
[i
++][0], ha
->addr
, ETH_ALEN
);
1061 sg_set_buf(&sg
[0], mac_data
,
1062 sizeof(mac_data
->entries
) + (uc_count
* ETH_ALEN
));
1064 /* multicast list and count fill the end */
1065 mac_data
= (void *)&mac_data
->macs
[uc_count
][0];
1067 mac_data
->entries
= mc_count
;
1069 netdev_for_each_mc_addr(ha
, dev
)
1070 memcpy(&mac_data
->macs
[i
++][0], ha
->addr
, ETH_ALEN
);
1072 sg_set_buf(&sg
[1], mac_data
,
1073 sizeof(mac_data
->entries
) + (mc_count
* ETH_ALEN
));
1075 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_MAC
,
1076 VIRTIO_NET_CTRL_MAC_TABLE_SET
,
1078 dev_warn(&dev
->dev
, "Failed to set MAC fitler table.\n");
1083 static int virtnet_vlan_rx_add_vid(struct net_device
*dev
,
1084 __be16 proto
, u16 vid
)
1086 struct virtnet_info
*vi
= netdev_priv(dev
);
1087 struct scatterlist sg
;
1089 sg_init_one(&sg
, &vid
, sizeof(vid
));
1091 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_VLAN
,
1092 VIRTIO_NET_CTRL_VLAN_ADD
, &sg
, NULL
))
1093 dev_warn(&dev
->dev
, "Failed to add VLAN ID %d.\n", vid
);
1097 static int virtnet_vlan_rx_kill_vid(struct net_device
*dev
,
1098 __be16 proto
, u16 vid
)
1100 struct virtnet_info
*vi
= netdev_priv(dev
);
1101 struct scatterlist sg
;
1103 sg_init_one(&sg
, &vid
, sizeof(vid
));
1105 if (!virtnet_send_command(vi
, VIRTIO_NET_CTRL_VLAN
,
1106 VIRTIO_NET_CTRL_VLAN_DEL
, &sg
, NULL
))
1107 dev_warn(&dev
->dev
, "Failed to kill VLAN ID %d.\n", vid
);
1111 static void virtnet_clean_affinity(struct virtnet_info
*vi
, long hcpu
)
1115 if (vi
->affinity_hint_set
) {
1116 for (i
= 0; i
< vi
->max_queue_pairs
; i
++) {
1117 virtqueue_set_affinity(vi
->rq
[i
].vq
, -1);
1118 virtqueue_set_affinity(vi
->sq
[i
].vq
, -1);
1121 vi
->affinity_hint_set
= false;
1125 static void virtnet_set_affinity(struct virtnet_info
*vi
)
1130 /* In multiqueue mode, when the number of cpu is equal to the number of
1131 * queue pairs, we let the queue pairs to be private to one cpu by
1132 * setting the affinity hint to eliminate the contention.
1134 if (vi
->curr_queue_pairs
== 1 ||
1135 vi
->max_queue_pairs
!= num_online_cpus()) {
1136 virtnet_clean_affinity(vi
, -1);
1141 for_each_online_cpu(cpu
) {
1142 virtqueue_set_affinity(vi
->rq
[i
].vq
, cpu
);
1143 virtqueue_set_affinity(vi
->sq
[i
].vq
, cpu
);
1144 netif_set_xps_queue(vi
->dev
, cpumask_of(cpu
), i
);
1148 vi
->affinity_hint_set
= true;
1151 static int virtnet_cpu_callback(struct notifier_block
*nfb
,
1152 unsigned long action
, void *hcpu
)
1154 struct virtnet_info
*vi
= container_of(nfb
, struct virtnet_info
, nb
);
1156 switch(action
& ~CPU_TASKS_FROZEN
) {
1158 case CPU_DOWN_FAILED
:
1160 virtnet_set_affinity(vi
);
1162 case CPU_DOWN_PREPARE
:
1163 virtnet_clean_affinity(vi
, (long)hcpu
);
1172 static void virtnet_get_ringparam(struct net_device
*dev
,
1173 struct ethtool_ringparam
*ring
)
1175 struct virtnet_info
*vi
= netdev_priv(dev
);
1177 ring
->rx_max_pending
= virtqueue_get_vring_size(vi
->rq
[0].vq
);
1178 ring
->tx_max_pending
= virtqueue_get_vring_size(vi
->sq
[0].vq
);
1179 ring
->rx_pending
= ring
->rx_max_pending
;
1180 ring
->tx_pending
= ring
->tx_max_pending
;
1184 static void virtnet_get_drvinfo(struct net_device
*dev
,
1185 struct ethtool_drvinfo
*info
)
1187 struct virtnet_info
*vi
= netdev_priv(dev
);
1188 struct virtio_device
*vdev
= vi
->vdev
;
1190 strlcpy(info
->driver
, KBUILD_MODNAME
, sizeof(info
->driver
));
1191 strlcpy(info
->version
, VIRTNET_DRIVER_VERSION
, sizeof(info
->version
));
1192 strlcpy(info
->bus_info
, virtio_bus_name(vdev
), sizeof(info
->bus_info
));
1196 /* TODO: Eliminate OOO packets during switching */
1197 static int virtnet_set_channels(struct net_device
*dev
,
1198 struct ethtool_channels
*channels
)
1200 struct virtnet_info
*vi
= netdev_priv(dev
);
1201 u16 queue_pairs
= channels
->combined_count
;
1204 /* We don't support separate rx/tx channels.
1205 * We don't allow setting 'other' channels.
1207 if (channels
->rx_count
|| channels
->tx_count
|| channels
->other_count
)
1210 if (queue_pairs
> vi
->max_queue_pairs
)
1214 err
= virtnet_set_queues(vi
, queue_pairs
);
1216 netif_set_real_num_tx_queues(dev
, queue_pairs
);
1217 netif_set_real_num_rx_queues(dev
, queue_pairs
);
1219 virtnet_set_affinity(vi
);
1226 static void virtnet_get_channels(struct net_device
*dev
,
1227 struct ethtool_channels
*channels
)
1229 struct virtnet_info
*vi
= netdev_priv(dev
);
1231 channels
->combined_count
= vi
->curr_queue_pairs
;
1232 channels
->max_combined
= vi
->max_queue_pairs
;
1233 channels
->max_other
= 0;
1234 channels
->rx_count
= 0;
1235 channels
->tx_count
= 0;
1236 channels
->other_count
= 0;
1239 static const struct ethtool_ops virtnet_ethtool_ops
= {
1240 .get_drvinfo
= virtnet_get_drvinfo
,
1241 .get_link
= ethtool_op_get_link
,
1242 .get_ringparam
= virtnet_get_ringparam
,
1243 .set_channels
= virtnet_set_channels
,
1244 .get_channels
= virtnet_get_channels
,
1248 #define MAX_MTU 65535
1250 static int virtnet_change_mtu(struct net_device
*dev
, int new_mtu
)
1252 if (new_mtu
< MIN_MTU
|| new_mtu
> MAX_MTU
)
1258 static const struct net_device_ops virtnet_netdev
= {
1259 .ndo_open
= virtnet_open
,
1260 .ndo_stop
= virtnet_close
,
1261 .ndo_start_xmit
= start_xmit
,
1262 .ndo_validate_addr
= eth_validate_addr
,
1263 .ndo_set_mac_address
= virtnet_set_mac_address
,
1264 .ndo_set_rx_mode
= virtnet_set_rx_mode
,
1265 .ndo_change_mtu
= virtnet_change_mtu
,
1266 .ndo_get_stats64
= virtnet_stats
,
1267 .ndo_vlan_rx_add_vid
= virtnet_vlan_rx_add_vid
,
1268 .ndo_vlan_rx_kill_vid
= virtnet_vlan_rx_kill_vid
,
1269 #ifdef CONFIG_NET_POLL_CONTROLLER
1270 .ndo_poll_controller
= virtnet_netpoll
,
1274 static void virtnet_config_changed_work(struct work_struct
*work
)
1276 struct virtnet_info
*vi
=
1277 container_of(work
, struct virtnet_info
, config_work
);
1280 mutex_lock(&vi
->config_lock
);
1281 if (!vi
->config_enable
)
1284 if (virtio_config_val(vi
->vdev
, VIRTIO_NET_F_STATUS
,
1285 offsetof(struct virtio_net_config
, status
),
1289 if (v
& VIRTIO_NET_S_ANNOUNCE
) {
1290 netdev_notify_peers(vi
->dev
);
1291 virtnet_ack_link_announce(vi
);
1294 /* Ignore unknown (future) status bits */
1295 v
&= VIRTIO_NET_S_LINK_UP
;
1297 if (vi
->status
== v
)
1302 if (vi
->status
& VIRTIO_NET_S_LINK_UP
) {
1303 netif_carrier_on(vi
->dev
);
1304 netif_tx_wake_all_queues(vi
->dev
);
1306 netif_carrier_off(vi
->dev
);
1307 netif_tx_stop_all_queues(vi
->dev
);
1310 mutex_unlock(&vi
->config_lock
);
1313 static void virtnet_config_changed(struct virtio_device
*vdev
)
1315 struct virtnet_info
*vi
= vdev
->priv
;
1317 schedule_work(&vi
->config_work
);
1320 static void virtnet_free_queues(struct virtnet_info
*vi
)
1326 static void free_receive_bufs(struct virtnet_info
*vi
)
1330 for (i
= 0; i
< vi
->max_queue_pairs
; i
++) {
1331 while (vi
->rq
[i
].pages
)
1332 __free_pages(get_a_page(&vi
->rq
[i
], GFP_KERNEL
), 0);
1336 static void free_unused_bufs(struct virtnet_info
*vi
)
1341 for (i
= 0; i
< vi
->max_queue_pairs
; i
++) {
1342 struct virtqueue
*vq
= vi
->sq
[i
].vq
;
1343 while ((buf
= virtqueue_detach_unused_buf(vq
)) != NULL
)
1347 for (i
= 0; i
< vi
->max_queue_pairs
; i
++) {
1348 struct virtqueue
*vq
= vi
->rq
[i
].vq
;
1350 while ((buf
= virtqueue_detach_unused_buf(vq
)) != NULL
) {
1351 if (vi
->big_packets
)
1352 give_pages(&vi
->rq
[i
], buf
);
1353 else if (vi
->mergeable_rx_bufs
)
1354 put_page(virt_to_head_page(buf
));
1359 BUG_ON(vi
->rq
[i
].num
!= 0);
1363 static void virtnet_del_vqs(struct virtnet_info
*vi
)
1365 struct virtio_device
*vdev
= vi
->vdev
;
1367 virtnet_clean_affinity(vi
, -1);
1369 vdev
->config
->del_vqs(vdev
);
1371 virtnet_free_queues(vi
);
1374 static int virtnet_find_vqs(struct virtnet_info
*vi
)
1376 vq_callback_t
**callbacks
;
1377 struct virtqueue
**vqs
;
1382 /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by
1383 * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by
1384 * possible control vq.
1386 total_vqs
= vi
->max_queue_pairs
* 2 +
1387 virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_VQ
);
1389 /* Allocate space for find_vqs parameters */
1390 vqs
= kzalloc(total_vqs
* sizeof(*vqs
), GFP_KERNEL
);
1393 callbacks
= kmalloc(total_vqs
* sizeof(*callbacks
), GFP_KERNEL
);
1396 names
= kmalloc(total_vqs
* sizeof(*names
), GFP_KERNEL
);
1400 /* Parameters for control virtqueue, if any */
1402 callbacks
[total_vqs
- 1] = NULL
;
1403 names
[total_vqs
- 1] = "control";
1406 /* Allocate/initialize parameters for send/receive virtqueues */
1407 for (i
= 0; i
< vi
->max_queue_pairs
; i
++) {
1408 callbacks
[rxq2vq(i
)] = skb_recv_done
;
1409 callbacks
[txq2vq(i
)] = skb_xmit_done
;
1410 sprintf(vi
->rq
[i
].name
, "input.%d", i
);
1411 sprintf(vi
->sq
[i
].name
, "output.%d", i
);
1412 names
[rxq2vq(i
)] = vi
->rq
[i
].name
;
1413 names
[txq2vq(i
)] = vi
->sq
[i
].name
;
1416 ret
= vi
->vdev
->config
->find_vqs(vi
->vdev
, total_vqs
, vqs
, callbacks
,
1422 vi
->cvq
= vqs
[total_vqs
- 1];
1423 if (virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_CTRL_VLAN
))
1424 vi
->dev
->features
|= NETIF_F_HW_VLAN_CTAG_FILTER
;
1427 for (i
= 0; i
< vi
->max_queue_pairs
; i
++) {
1428 vi
->rq
[i
].vq
= vqs
[rxq2vq(i
)];
1429 vi
->sq
[i
].vq
= vqs
[txq2vq(i
)];
1448 static int virtnet_alloc_queues(struct virtnet_info
*vi
)
1452 vi
->sq
= kzalloc(sizeof(*vi
->sq
) * vi
->max_queue_pairs
, GFP_KERNEL
);
1455 vi
->rq
= kzalloc(sizeof(*vi
->rq
) * vi
->max_queue_pairs
, GFP_KERNEL
);
1459 INIT_DELAYED_WORK(&vi
->refill
, refill_work
);
1460 for (i
= 0; i
< vi
->max_queue_pairs
; i
++) {
1461 vi
->rq
[i
].pages
= NULL
;
1462 netif_napi_add(vi
->dev
, &vi
->rq
[i
].napi
, virtnet_poll
,
1465 sg_init_table(vi
->rq
[i
].sg
, ARRAY_SIZE(vi
->rq
[i
].sg
));
1466 sg_init_table(vi
->sq
[i
].sg
, ARRAY_SIZE(vi
->sq
[i
].sg
));
1477 static int init_vqs(struct virtnet_info
*vi
)
1481 /* Allocate send & receive queues */
1482 ret
= virtnet_alloc_queues(vi
);
1486 ret
= virtnet_find_vqs(vi
);
1491 virtnet_set_affinity(vi
);
1497 virtnet_free_queues(vi
);
1502 static int virtnet_probe(struct virtio_device
*vdev
)
1505 struct net_device
*dev
;
1506 struct virtnet_info
*vi
;
1507 u16 max_queue_pairs
;
1509 /* Find if host supports multiqueue virtio_net device */
1510 err
= virtio_config_val(vdev
, VIRTIO_NET_F_MQ
,
1511 offsetof(struct virtio_net_config
,
1512 max_virtqueue_pairs
), &max_queue_pairs
);
1514 /* We need at least 2 queue's */
1515 if (err
|| max_queue_pairs
< VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN
||
1516 max_queue_pairs
> VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX
||
1517 !virtio_has_feature(vdev
, VIRTIO_NET_F_CTRL_VQ
))
1518 max_queue_pairs
= 1;
1520 /* Allocate ourselves a network device with room for our info */
1521 dev
= alloc_etherdev_mq(sizeof(struct virtnet_info
), max_queue_pairs
);
1525 /* Set up network device as normal. */
1526 dev
->priv_flags
|= IFF_UNICAST_FLT
| IFF_LIVE_ADDR_CHANGE
;
1527 dev
->netdev_ops
= &virtnet_netdev
;
1528 dev
->features
= NETIF_F_HIGHDMA
;
1530 SET_ETHTOOL_OPS(dev
, &virtnet_ethtool_ops
);
1531 SET_NETDEV_DEV(dev
, &vdev
->dev
);
1533 /* Do we support "hardware" checksums? */
1534 if (virtio_has_feature(vdev
, VIRTIO_NET_F_CSUM
)) {
1535 /* This opens up the world of extra features. */
1536 dev
->hw_features
|= NETIF_F_HW_CSUM
|NETIF_F_SG
|NETIF_F_FRAGLIST
;
1538 dev
->features
|= NETIF_F_HW_CSUM
|NETIF_F_SG
|NETIF_F_FRAGLIST
;
1540 if (virtio_has_feature(vdev
, VIRTIO_NET_F_GSO
)) {
1541 dev
->hw_features
|= NETIF_F_TSO
| NETIF_F_UFO
1542 | NETIF_F_TSO_ECN
| NETIF_F_TSO6
;
1544 /* Individual feature bits: what can host handle? */
1545 if (virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_TSO4
))
1546 dev
->hw_features
|= NETIF_F_TSO
;
1547 if (virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_TSO6
))
1548 dev
->hw_features
|= NETIF_F_TSO6
;
1549 if (virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_ECN
))
1550 dev
->hw_features
|= NETIF_F_TSO_ECN
;
1551 if (virtio_has_feature(vdev
, VIRTIO_NET_F_HOST_UFO
))
1552 dev
->hw_features
|= NETIF_F_UFO
;
1555 dev
->features
|= dev
->hw_features
& (NETIF_F_ALL_TSO
|NETIF_F_UFO
);
1556 /* (!csum && gso) case will be fixed by register_netdev() */
1558 if (virtio_has_feature(vdev
, VIRTIO_NET_F_GUEST_CSUM
))
1559 dev
->features
|= NETIF_F_RXCSUM
;
1561 dev
->vlan_features
= dev
->features
;
1563 /* Configuration may specify what MAC to use. Otherwise random. */
1564 if (virtio_config_val_len(vdev
, VIRTIO_NET_F_MAC
,
1565 offsetof(struct virtio_net_config
, mac
),
1566 dev
->dev_addr
, dev
->addr_len
) < 0)
1567 eth_hw_addr_random(dev
);
1569 /* Set up our device-specific information */
1570 vi
= netdev_priv(dev
);
1574 vi
->stats
= alloc_percpu(struct virtnet_stats
);
1576 if (vi
->stats
== NULL
)
1579 mutex_init(&vi
->config_lock
);
1580 vi
->config_enable
= true;
1581 INIT_WORK(&vi
->config_work
, virtnet_config_changed_work
);
1583 /* If we can receive ANY GSO packets, we must allocate large ones. */
1584 if (virtio_has_feature(vdev
, VIRTIO_NET_F_GUEST_TSO4
) ||
1585 virtio_has_feature(vdev
, VIRTIO_NET_F_GUEST_TSO6
) ||
1586 virtio_has_feature(vdev
, VIRTIO_NET_F_GUEST_ECN
))
1587 vi
->big_packets
= true;
1589 if (virtio_has_feature(vdev
, VIRTIO_NET_F_MRG_RXBUF
))
1590 vi
->mergeable_rx_bufs
= true;
1592 if (virtio_has_feature(vdev
, VIRTIO_F_ANY_LAYOUT
))
1593 vi
->any_header_sg
= true;
1595 if (virtio_has_feature(vdev
, VIRTIO_NET_F_CTRL_VQ
))
1598 /* Use single tx/rx queue pair as default */
1599 vi
->curr_queue_pairs
= 1;
1600 vi
->max_queue_pairs
= max_queue_pairs
;
1602 /* Allocate/initialize the rx/tx queues, and invoke find_vqs */
1607 netif_set_real_num_tx_queues(dev
, 1);
1608 netif_set_real_num_rx_queues(dev
, 1);
1610 err
= register_netdev(dev
);
1612 pr_debug("virtio_net: registering device failed\n");
1616 /* Last of all, set up some receive buffers. */
1617 for (i
= 0; i
< vi
->curr_queue_pairs
; i
++) {
1618 try_fill_recv(&vi
->rq
[i
], GFP_KERNEL
);
1620 /* If we didn't even get one input buffer, we're useless. */
1621 if (vi
->rq
[i
].num
== 0) {
1622 free_unused_bufs(vi
);
1624 goto free_recv_bufs
;
1628 vi
->nb
.notifier_call
= &virtnet_cpu_callback
;
1629 err
= register_hotcpu_notifier(&vi
->nb
);
1631 pr_debug("virtio_net: registering cpu notifier failed\n");
1632 goto free_recv_bufs
;
1635 /* Assume link up if device can't report link status,
1636 otherwise get link status from config. */
1637 if (virtio_has_feature(vi
->vdev
, VIRTIO_NET_F_STATUS
)) {
1638 netif_carrier_off(dev
);
1639 schedule_work(&vi
->config_work
);
1641 vi
->status
= VIRTIO_NET_S_LINK_UP
;
1642 netif_carrier_on(dev
);
1645 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n",
1646 dev
->name
, max_queue_pairs
);
1651 free_receive_bufs(vi
);
1652 unregister_netdev(dev
);
1654 cancel_delayed_work_sync(&vi
->refill
);
1655 virtnet_del_vqs(vi
);
1656 if (vi
->alloc_frag
.page
)
1657 put_page(vi
->alloc_frag
.page
);
1659 free_percpu(vi
->stats
);
1665 static void remove_vq_common(struct virtnet_info
*vi
)
1667 vi
->vdev
->config
->reset(vi
->vdev
);
1669 /* Free unused buffers in both send and recv, if any. */
1670 free_unused_bufs(vi
);
1672 free_receive_bufs(vi
);
1674 virtnet_del_vqs(vi
);
1677 static void virtnet_remove(struct virtio_device
*vdev
)
1679 struct virtnet_info
*vi
= vdev
->priv
;
1681 unregister_hotcpu_notifier(&vi
->nb
);
1683 /* Prevent config work handler from accessing the device. */
1684 mutex_lock(&vi
->config_lock
);
1685 vi
->config_enable
= false;
1686 mutex_unlock(&vi
->config_lock
);
1688 unregister_netdev(vi
->dev
);
1690 remove_vq_common(vi
);
1691 if (vi
->alloc_frag
.page
)
1692 put_page(vi
->alloc_frag
.page
);
1694 flush_work(&vi
->config_work
);
1696 free_percpu(vi
->stats
);
1697 free_netdev(vi
->dev
);
1701 static int virtnet_freeze(struct virtio_device
*vdev
)
1703 struct virtnet_info
*vi
= vdev
->priv
;
1706 unregister_hotcpu_notifier(&vi
->nb
);
1708 /* Prevent config work handler from accessing the device */
1709 mutex_lock(&vi
->config_lock
);
1710 vi
->config_enable
= false;
1711 mutex_unlock(&vi
->config_lock
);
1713 netif_device_detach(vi
->dev
);
1714 cancel_delayed_work_sync(&vi
->refill
);
1716 if (netif_running(vi
->dev
))
1717 for (i
= 0; i
< vi
->max_queue_pairs
; i
++) {
1718 napi_disable(&vi
->rq
[i
].napi
);
1719 netif_napi_del(&vi
->rq
[i
].napi
);
1722 remove_vq_common(vi
);
1724 flush_work(&vi
->config_work
);
1729 static int virtnet_restore(struct virtio_device
*vdev
)
1731 struct virtnet_info
*vi
= vdev
->priv
;
1738 if (netif_running(vi
->dev
))
1739 for (i
= 0; i
< vi
->max_queue_pairs
; i
++)
1740 virtnet_napi_enable(&vi
->rq
[i
]);
1742 netif_device_attach(vi
->dev
);
1744 for (i
= 0; i
< vi
->curr_queue_pairs
; i
++)
1745 if (!try_fill_recv(&vi
->rq
[i
], GFP_KERNEL
))
1746 schedule_delayed_work(&vi
->refill
, 0);
1748 mutex_lock(&vi
->config_lock
);
1749 vi
->config_enable
= true;
1750 mutex_unlock(&vi
->config_lock
);
1753 virtnet_set_queues(vi
, vi
->curr_queue_pairs
);
1756 err
= register_hotcpu_notifier(&vi
->nb
);
1764 static struct virtio_device_id id_table
[] = {
1765 { VIRTIO_ID_NET
, VIRTIO_DEV_ANY_ID
},
1769 static unsigned int features
[] = {
1770 VIRTIO_NET_F_CSUM
, VIRTIO_NET_F_GUEST_CSUM
,
1771 VIRTIO_NET_F_GSO
, VIRTIO_NET_F_MAC
,
1772 VIRTIO_NET_F_HOST_TSO4
, VIRTIO_NET_F_HOST_UFO
, VIRTIO_NET_F_HOST_TSO6
,
1773 VIRTIO_NET_F_HOST_ECN
, VIRTIO_NET_F_GUEST_TSO4
, VIRTIO_NET_F_GUEST_TSO6
,
1774 VIRTIO_NET_F_GUEST_ECN
, VIRTIO_NET_F_GUEST_UFO
,
1775 VIRTIO_NET_F_MRG_RXBUF
, VIRTIO_NET_F_STATUS
, VIRTIO_NET_F_CTRL_VQ
,
1776 VIRTIO_NET_F_CTRL_RX
, VIRTIO_NET_F_CTRL_VLAN
,
1777 VIRTIO_NET_F_GUEST_ANNOUNCE
, VIRTIO_NET_F_MQ
,
1778 VIRTIO_NET_F_CTRL_MAC_ADDR
,
1779 VIRTIO_F_ANY_LAYOUT
,
1782 static struct virtio_driver virtio_net_driver
= {
1783 .feature_table
= features
,
1784 .feature_table_size
= ARRAY_SIZE(features
),
1785 .driver
.name
= KBUILD_MODNAME
,
1786 .driver
.owner
= THIS_MODULE
,
1787 .id_table
= id_table
,
1788 .probe
= virtnet_probe
,
1789 .remove
= virtnet_remove
,
1790 .config_changed
= virtnet_config_changed
,
1792 .freeze
= virtnet_freeze
,
1793 .restore
= virtnet_restore
,
1797 module_virtio_driver(virtio_net_driver
);
1799 MODULE_DEVICE_TABLE(virtio
, id_table
);
1800 MODULE_DESCRIPTION("Virtio network driver");
1801 MODULE_LICENSE("GPL");