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SubjectRe: [net-next RFC V5 4/5] virtio_net: multiqueue support
On 07/20/2012 09:40 PM, Michael S. Tsirkin wrote:
> On Thu, Jul 05, 2012 at 06:29:53PM +0800, Jason Wang wrote:
>> This patch converts virtio_net to a multi queue device. After negotiated
>> VIRTIO_NET_F_MULTIQUEUE feature, the virtio device has many tx/rx queue pairs,
>> and driver could read the number from config space.
>>
>> The driver expects the number of rx/tx queue paris is equal to the number of
>> vcpus. To maximize the performance under this per-cpu rx/tx queue pairs, some
>> optimization were introduced:
>>
>> - Txq selection is based on the processor id in order to avoid contending a lock
>> whose owner may exits to host.
>> - Since the txq/txq were per-cpu, affinity hint were set to the cpu that owns
>> the queue pairs.
>>
>> Signed-off-by: Krishna Kumar<krkumar2@in.ibm.com>
>> Signed-off-by: Jason Wang<jasowang@redhat.com>
> Overall fine. I think it is best to smash the following patch
> into this one, so that default behavior does not
> jump to mq then back. some comments below: mostly nits, and a minor bug.

Sure, thanks for the reviewing.
>
> If you are worried the patch is too big, it can be split
> differently
> - rework to use send_queue/receive_queue structures, no
> functional changes.
> - add multiqueue
>
> but this is not a must.
>
>> ---
>> drivers/net/virtio_net.c | 645 ++++++++++++++++++++++++++++++-------------
>> include/linux/virtio_net.h | 2 +
>> 2 files changed, 452 insertions(+), 195 deletions(-)
>>
>> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
>> index 1db445b..7410187 100644
>> --- a/drivers/net/virtio_net.c
>> +++ b/drivers/net/virtio_net.c
>> @@ -26,6 +26,7 @@
>> #include<linux/scatterlist.h>
>> #include<linux/if_vlan.h>
>> #include<linux/slab.h>
>> +#include<linux/interrupt.h>
>>
>> static int napi_weight = 128;
>> module_param(napi_weight, int, 0444);
>> @@ -41,6 +42,8 @@ module_param(gso, bool, 0444);
>> #define VIRTNET_SEND_COMMAND_SG_MAX 2
>> #define VIRTNET_DRIVER_VERSION "1.0.0"
>>
>> +#define MAX_QUEUES 256
>> +
>> struct virtnet_stats {
>> struct u64_stats_sync tx_syncp;
>> struct u64_stats_sync rx_syncp;
> Would be a bit better not to have artificial limits like that.
> Maybe allocate arrays at probe time, then we can
> take whatever the device gives us?

Sure.
>> @@ -51,43 +54,69 @@ struct virtnet_stats {
>> u64 rx_packets;
>> };
>>
>> -struct virtnet_info {
>> - struct virtio_device *vdev;
>> - struct virtqueue *rvq, *svq, *cvq;
>> - struct net_device *dev;
>> +/* Internal representation of a send virtqueue */
>> +struct send_queue {
>> + /* Virtqueue associated with this send _queue */
>> + struct virtqueue *vq;
>> +
>> + /* TX: fragments + linear part + virtio header */
>> + struct scatterlist sg[MAX_SKB_FRAGS + 2];
>> +};
>> +
>> +/* Internal representation of a receive virtqueue */
>> +struct receive_queue {
>> + /* Virtqueue associated with this receive_queue */
>> + struct virtqueue *vq;
>> +
>> + /* Back pointer to the virtnet_info */
>> + struct virtnet_info *vi;
>> +
>> struct napi_struct napi;
>> - unsigned int status;
>>
>> /* Number of input buffers, and max we've ever had. */
>> unsigned int num, max;
>>
>> + /* Work struct for refilling if we run low on memory. */
>> + struct delayed_work refill;
>> +
>> + /* Chain pages by the private ptr. */
>> + struct page *pages;
>> +
>> + /* RX: fragments + linear part + virtio header */
>> + struct scatterlist sg[MAX_SKB_FRAGS + 2];
>> +};
>> +
>> +struct virtnet_info {
>> + u16 num_queue_pairs; /* # of RX/TX vq pairs */
>> +
>> + struct send_queue *sq[MAX_QUEUES] ____cacheline_aligned_in_smp;
>> + struct receive_queue *rq[MAX_QUEUES] ____cacheline_aligned_in_smp;
> The assumption is a tx/rx pair is handled on the same cpu, yes?
> If yes maybe make it a single array to improve cache locality
> a bit?
> struct queue_pair {
> struct send_queue sq;
> struct receive_queue rq;
> };

Ok.
>> + struct virtqueue *cvq;
>> +
>> + struct virtio_device *vdev;
>> + struct net_device *dev;
>> + unsigned int status;
>> +
>> /* I like... big packets and I cannot lie! */
>> bool big_packets;
>>
>> /* Host will merge rx buffers for big packets (shake it! shake it!) */
>> bool mergeable_rx_bufs;
>>
>> + /* Has control virtqueue */
>> + bool has_cvq;
>> +
> won't checking (cvq != NULL) be enough?

Enough, so has_cvq is dupliated with vi->cvq. I will remove it in next
version.
>
>> /* enable config space updates */
>> bool config_enable;
>>
>> /* Active statistics */
>> struct virtnet_stats __percpu *stats;
>>
>> - /* Work struct for refilling if we run low on memory. */
>> - struct delayed_work refill;
>> -
>> /* Work struct for config space updates */
>> struct work_struct config_work;
>>
>> /* Lock for config space updates */
>> struct mutex config_lock;
>> -
>> - /* Chain pages by the private ptr. */
>> - struct page *pages;
>> -
>> - /* fragments + linear part + virtio header */
>> - struct scatterlist rx_sg[MAX_SKB_FRAGS + 2];
>> - struct scatterlist tx_sg[MAX_SKB_FRAGS + 2];
>> };
>>
>> struct skb_vnet_hdr {
>> @@ -108,6 +137,22 @@ struct padded_vnet_hdr {
>> char padding[6];
>> };
>>
>> +static inline int txq_get_qnum(struct virtnet_info *vi, struct virtqueue *vq)
>> +{
>> + int ret = virtqueue_get_queue_index(vq);
>> +
>> + /* skip ctrl vq */
>> + if (vi->has_cvq)
>> + return (ret - 1) / 2;
>> + else
>> + return ret / 2;
>> +}
>> +
>> +static inline int rxq_get_qnum(struct virtnet_info *vi, struct virtqueue *vq)
>> +{
>> + return virtqueue_get_queue_index(vq) / 2;
>> +}
>> +
>> static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb)
>> {
>> return (struct skb_vnet_hdr *)skb->cb;
>> @@ -117,22 +162,22 @@ static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb)
>> * private is used to chain pages for big packets, put the whole
>> * most recent used list in the beginning for reuse
>> */
>> -static void give_pages(struct virtnet_info *vi, struct page *page)
>> +static void give_pages(struct receive_queue *rq, struct page *page)
>> {
>> struct page *end;
>>
>> /* Find end of list, sew whole thing into vi->pages. */
>> for (end = page; end->private; end = (struct page *)end->private);
>> - end->private = (unsigned long)vi->pages;
>> - vi->pages = page;
>> + end->private = (unsigned long)rq->pages;
>> + rq->pages = page;
>> }
>>
>> -static struct page *get_a_page(struct virtnet_info *vi, gfp_t gfp_mask)
>> +static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask)
>> {
>> - struct page *p = vi->pages;
>> + struct page *p = rq->pages;
>>
>> if (p) {
>> - vi->pages = (struct page *)p->private;
>> + rq->pages = (struct page *)p->private;
>> /* clear private here, it is used to chain pages */
>> p->private = 0;
>> } else
>> @@ -140,15 +185,15 @@ static struct page *get_a_page(struct virtnet_info *vi, gfp_t gfp_mask)
>> return p;
>> }
>>
>> -static void skb_xmit_done(struct virtqueue *svq)
>> +static void skb_xmit_done(struct virtqueue *vq)
>> {
>> - struct virtnet_info *vi = svq->vdev->priv;
>> + struct virtnet_info *vi = vq->vdev->priv;
>>
>> /* Suppress further interrupts. */
>> - virtqueue_disable_cb(svq);
>> + virtqueue_disable_cb(vq);
>>
>> /* We were probably waiting for more output buffers. */
>> - netif_wake_queue(vi->dev);
>> + netif_wake_subqueue(vi->dev, txq_get_qnum(vi, vq));
>> }
>>
>> static void set_skb_frag(struct sk_buff *skb, struct page *page,
>> @@ -167,9 +212,10 @@ static void set_skb_frag(struct sk_buff *skb, struct page *page,
>> }
>>
>> /* Called from bottom half context */
>> -static struct sk_buff *page_to_skb(struct virtnet_info *vi,
>> +static struct sk_buff *page_to_skb(struct receive_queue *rq,
>> struct page *page, unsigned int len)
>> {
>> + struct virtnet_info *vi = rq->vi;
>> struct sk_buff *skb;
>> struct skb_vnet_hdr *hdr;
>> unsigned int copy, hdr_len, offset;
>> @@ -225,12 +271,12 @@ static struct sk_buff *page_to_skb(struct virtnet_info *vi,
>> }
>>
>> if (page)
>> - give_pages(vi, page);
>> + give_pages(rq, page);
>>
>> return skb;
>> }
>>
>> -static int receive_mergeable(struct virtnet_info *vi, struct sk_buff *skb)
>> +static int receive_mergeable(struct receive_queue *rq, struct sk_buff *skb)
>> {
>> struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
>> struct page *page;
>> @@ -244,7 +290,7 @@ static int receive_mergeable(struct virtnet_info *vi, struct sk_buff *skb)
>> skb->dev->stats.rx_length_errors++;
>> return -EINVAL;
>> }
>> - page = virtqueue_get_buf(vi->rvq,&len);
>> + page = virtqueue_get_buf(rq->vq,&len);
>> if (!page) {
>> pr_debug("%s: rx error: %d buffers missing\n",
>> skb->dev->name, hdr->mhdr.num_buffers);
>> @@ -257,13 +303,14 @@ static int receive_mergeable(struct virtnet_info *vi, struct sk_buff *skb)
>>
>> set_skb_frag(skb, page, 0,&len);
>>
>> - --vi->num;
>> + --rq->num;
>> }
>> return 0;
>> }
>>
>> -static void receive_buf(struct net_device *dev, void *buf, unsigned int len)
>> +static void receive_buf(struct receive_queue *rq, void *buf, unsigned int len)
>> {
>> + struct net_device *dev = rq->vi->dev;
>> struct virtnet_info *vi = netdev_priv(dev);
>> struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
>> struct sk_buff *skb;
>> @@ -274,7 +321,7 @@ static void receive_buf(struct net_device *dev, void *buf, unsigned int len)
>> pr_debug("%s: short packet %i\n", dev->name, len);
>> dev->stats.rx_length_errors++;
>> if (vi->mergeable_rx_bufs || vi->big_packets)
>> - give_pages(vi, buf);
>> + give_pages(rq, buf);
>> else
>> dev_kfree_skb(buf);
>> return;
>> @@ -286,14 +333,14 @@ static void receive_buf(struct net_device *dev, void *buf, unsigned int len)
>> skb_trim(skb, len);
>> } else {
>> page = buf;
>> - skb = page_to_skb(vi, page, len);
>> + skb = page_to_skb(rq, page, len);
>> if (unlikely(!skb)) {
>> dev->stats.rx_dropped++;
>> - give_pages(vi, page);
>> + give_pages(rq, page);
>> return;
>> }
>> if (vi->mergeable_rx_bufs)
>> - if (receive_mergeable(vi, skb)) {
>> + if (receive_mergeable(rq, skb)) {
>> dev_kfree_skb(skb);
>> return;
>> }
>> @@ -363,90 +410,91 @@ frame_err:
>> dev_kfree_skb(skb);
>> }
>>
>> -static int add_recvbuf_small(struct virtnet_info *vi, gfp_t gfp)
>> +static int add_recvbuf_small(struct receive_queue *rq, gfp_t gfp)
>> {
>> struct sk_buff *skb;
>> struct skb_vnet_hdr *hdr;
>> int err;
>>
>> - skb = __netdev_alloc_skb_ip_align(vi->dev, MAX_PACKET_LEN, gfp);
>> + skb = __netdev_alloc_skb_ip_align(rq->vi->dev, MAX_PACKET_LEN, gfp);
>> if (unlikely(!skb))
>> return -ENOMEM;
>>
>> skb_put(skb, MAX_PACKET_LEN);
>>
>> hdr = skb_vnet_hdr(skb);
>> - sg_set_buf(vi->rx_sg,&hdr->hdr, sizeof hdr->hdr);
>> + sg_set_buf(rq->sg,&hdr->hdr, sizeof hdr->hdr);
>> +
>> + skb_to_sgvec(skb, rq->sg + 1, 0, skb->len);
>>
>> - skb_to_sgvec(skb, vi->rx_sg + 1, 0, skb->len);
>> + err = virtqueue_add_buf(rq->vq, rq->sg, 0, 2, skb, gfp);
>>
>> - err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, 2, skb, gfp);
>> if (err< 0)
>> dev_kfree_skb(skb);
>>
>> return err;
>> }
>>
>> -static int add_recvbuf_big(struct virtnet_info *vi, gfp_t gfp)
>> +static int add_recvbuf_big(struct receive_queue *rq, gfp_t gfp)
>> {
>> struct page *first, *list = NULL;
>> char *p;
>> int i, err, offset;
>>
>> - /* page in vi->rx_sg[MAX_SKB_FRAGS + 1] is list tail */
>> + /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */
>> for (i = MAX_SKB_FRAGS + 1; i> 1; --i) {
>> - first = get_a_page(vi, gfp);
>> + first = get_a_page(rq, gfp);
>> if (!first) {
>> if (list)
>> - give_pages(vi, list);
>> + give_pages(rq, list);
>> return -ENOMEM;
>> }
>> - sg_set_buf(&vi->rx_sg[i], page_address(first), PAGE_SIZE);
>> + sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE);
>>
>> /* chain new page in list head to match sg */
>> first->private = (unsigned long)list;
>> list = first;
>> }
>>
>> - first = get_a_page(vi, gfp);
>> + first = get_a_page(rq, gfp);
>> if (!first) {
>> - give_pages(vi, list);
>> + give_pages(rq, list);
>> return -ENOMEM;
>> }
>> p = page_address(first);
>>
>> - /* vi->rx_sg[0], vi->rx_sg[1] share the same page */
>> - /* a separated vi->rx_sg[0] for virtio_net_hdr only due to QEMU bug */
>> - sg_set_buf(&vi->rx_sg[0], p, sizeof(struct virtio_net_hdr));
>> + /* rq->sg[0], rq->sg[1] share the same page */
>> + /* a separated rq->sg[0] for virtio_net_hdr only due to QEMU bug */
>> + sg_set_buf(&rq->sg[0], p, sizeof(struct virtio_net_hdr));
>>
>> - /* vi->rx_sg[1] for data packet, from offset */
>> + /* rq->sg[1] for data packet, from offset */
>> offset = sizeof(struct padded_vnet_hdr);
>> - sg_set_buf(&vi->rx_sg[1], p + offset, PAGE_SIZE - offset);
>> + sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset);
>>
>> /* chain first in list head */
>> first->private = (unsigned long)list;
>> - err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, MAX_SKB_FRAGS + 2,
>> + err = virtqueue_add_buf(rq->vq, rq->sg, 0, MAX_SKB_FRAGS + 2,
>> first, gfp);
>> if (err< 0)
>> - give_pages(vi, first);
>> + give_pages(rq, first);
>>
>> return err;
>> }
>>
>> -static int add_recvbuf_mergeable(struct virtnet_info *vi, gfp_t gfp)
>> +static int add_recvbuf_mergeable(struct receive_queue *rq, gfp_t gfp)
>> {
>> struct page *page;
>> int err;
>>
>> - page = get_a_page(vi, gfp);
>> + page = get_a_page(rq, gfp);
>> if (!page)
>> return -ENOMEM;
>>
>> - sg_init_one(vi->rx_sg, page_address(page), PAGE_SIZE);
>> + sg_init_one(rq->sg, page_address(page), PAGE_SIZE);
>>
>> - err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, 1, page, gfp);
>> + err = virtqueue_add_buf(rq->vq, rq->sg, 0, 1, page, gfp);
>> if (err< 0)
>> - give_pages(vi, page);
>> + give_pages(rq, page);
>>
>> return err;
>> }
>> @@ -458,97 +506,104 @@ static int add_recvbuf_mergeable(struct virtnet_info *vi, gfp_t gfp)
>> * before we're receiving packets, or from refill_work which is
>> * careful to disable receiving (using napi_disable).
>> */
>> -static bool try_fill_recv(struct virtnet_info *vi, gfp_t gfp)
>> +static bool try_fill_recv(struct receive_queue *rq, gfp_t gfp)
>> {
>> + struct virtnet_info *vi = rq->vi;
>> int err;
>> bool oom;
>>
>> do {
>> if (vi->mergeable_rx_bufs)
>> - err = add_recvbuf_mergeable(vi, gfp);
>> + err = add_recvbuf_mergeable(rq, gfp);
>> else if (vi->big_packets)
>> - err = add_recvbuf_big(vi, gfp);
>> + err = add_recvbuf_big(rq, gfp);
>> else
>> - err = add_recvbuf_small(vi, gfp);
>> + err = add_recvbuf_small(rq, gfp);
>>
>> oom = err == -ENOMEM;
>> if (err< 0)
>> break;
>> - ++vi->num;
>> + ++rq->num;
>> } while (err> 0);
>> - if (unlikely(vi->num> vi->max))
>> - vi->max = vi->num;
>> - virtqueue_kick(vi->rvq);
>> + if (unlikely(rq->num> rq->max))
>> + rq->max = rq->num;
>> + virtqueue_kick(rq->vq);
>> return !oom;
>> }
>>
>> -static void skb_recv_done(struct virtqueue *rvq)
>> +static void skb_recv_done(struct virtqueue *vq)
>> {
>> - struct virtnet_info *vi = rvq->vdev->priv;
>> + struct virtnet_info *vi = vq->vdev->priv;
>> + struct napi_struct *napi =&vi->rq[rxq_get_qnum(vi, vq)]->napi;
>> +
>> /* Schedule NAPI, Suppress further interrupts if successful. */
>> - if (napi_schedule_prep(&vi->napi)) {
>> - virtqueue_disable_cb(rvq);
>> - __napi_schedule(&vi->napi);
>> + if (napi_schedule_prep(napi)) {
>> + virtqueue_disable_cb(vq);
>> + __napi_schedule(napi);
>> }
>> }
>>
>> -static void virtnet_napi_enable(struct virtnet_info *vi)
>> +static void virtnet_napi_enable(struct receive_queue *rq)
>> {
>> - napi_enable(&vi->napi);
>> + napi_enable(&rq->napi);
>>
>> /* If all buffers were filled by other side before we napi_enabled, we
>> * won't get another interrupt, so process any outstanding packets
>> * now. virtnet_poll wants re-enable the queue, so we disable here.
>> * We synchronize against interrupts via NAPI_STATE_SCHED */
>> - if (napi_schedule_prep(&vi->napi)) {
>> - virtqueue_disable_cb(vi->rvq);
>> + if (napi_schedule_prep(&rq->napi)) {
>> + virtqueue_disable_cb(rq->vq);
>> local_bh_disable();
>> - __napi_schedule(&vi->napi);
>> + __napi_schedule(&rq->napi);
>> local_bh_enable();
>> }
>> }
>>
>> static void refill_work(struct work_struct *work)
>> {
>> - struct virtnet_info *vi;
>> + struct napi_struct *napi;
>> + struct receive_queue *rq;
>> bool still_empty;
>>
>> - vi = container_of(work, struct virtnet_info, refill.work);
>> - napi_disable(&vi->napi);
>> - still_empty = !try_fill_recv(vi, GFP_KERNEL);
>> - virtnet_napi_enable(vi);
>> + rq = container_of(work, struct receive_queue, refill.work);
>> + napi =&rq->napi;
>> +
>> + napi_disable(napi);
>> + still_empty = !try_fill_recv(rq, GFP_KERNEL);
>> + virtnet_napi_enable(rq);
>>
>> /* In theory, this can happen: if we don't get any buffers in
>> * we will *never* try to fill again. */
>> if (still_empty)
>> - queue_delayed_work(system_nrt_wq,&vi->refill, HZ/2);
>> + queue_delayed_work(system_nrt_wq,&rq->refill, HZ/2);
>> }
>>
>> static int virtnet_poll(struct napi_struct *napi, int budget)
>> {
>> - struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi);
>> + struct receive_queue *rq = container_of(napi, struct receive_queue,
>> + napi);
>> void *buf;
>> unsigned int len, received = 0;
>>
>> again:
>> while (received< budget&&
>> - (buf = virtqueue_get_buf(vi->rvq,&len)) != NULL) {
>> - receive_buf(vi->dev, buf, len);
>> - --vi->num;
>> + (buf = virtqueue_get_buf(rq->vq,&len)) != NULL) {
>> + receive_buf(rq, buf, len);
>> + --rq->num;
>> received++;
>> }
>>
>> - if (vi->num< vi->max / 2) {
>> - if (!try_fill_recv(vi, GFP_ATOMIC))
>> - queue_delayed_work(system_nrt_wq,&vi->refill, 0);
>> + if (rq->num< rq->max / 2) {
>> + if (!try_fill_recv(rq, GFP_ATOMIC))
>> + queue_delayed_work(system_nrt_wq,&rq->refill, 0);
>> }
>>
>> /* Out of packets? */
>> if (received< budget) {
>> napi_complete(napi);
>> - if (unlikely(!virtqueue_enable_cb(vi->rvq))&&
>> + if (unlikely(!virtqueue_enable_cb(rq->vq))&&
>> napi_schedule_prep(napi)) {
>> - virtqueue_disable_cb(vi->rvq);
>> + virtqueue_disable_cb(rq->vq);
>> __napi_schedule(napi);
>> goto again;
>> }
>> @@ -557,13 +612,14 @@ again:
>> return received;
>> }
>>
>> -static unsigned int free_old_xmit_skbs(struct virtnet_info *vi)
>> +static unsigned int free_old_xmit_skbs(struct virtnet_info *vi,
>> + struct virtqueue *vq)
>> {
>> struct sk_buff *skb;
>> unsigned int len, tot_sgs = 0;
>> struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
>>
>> - while ((skb = virtqueue_get_buf(vi->svq,&len)) != NULL) {
>> + while ((skb = virtqueue_get_buf(vq,&len)) != NULL) {
>> pr_debug("Sent skb %p\n", skb);
>>
>> u64_stats_update_begin(&stats->tx_syncp);
>> @@ -577,7 +633,8 @@ static unsigned int free_old_xmit_skbs(struct virtnet_info *vi)
>> return tot_sgs;
>> }
>>
>> -static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb)
>> +static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb,
>> + struct virtqueue *vq, struct scatterlist *sg)
>> {
>> struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
>> const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
>> @@ -615,44 +672,47 @@ static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb)
>>
>> /* Encode metadata header at front. */
>> if (vi->mergeable_rx_bufs)
>> - sg_set_buf(vi->tx_sg,&hdr->mhdr, sizeof hdr->mhdr);
>> + sg_set_buf(sg,&hdr->mhdr, sizeof hdr->mhdr);
>> else
>> - sg_set_buf(vi->tx_sg,&hdr->hdr, sizeof hdr->hdr);
>> + sg_set_buf(sg,&hdr->hdr, sizeof hdr->hdr);
>>
>> - hdr->num_sg = skb_to_sgvec(skb, vi->tx_sg + 1, 0, skb->len) + 1;
>> - return virtqueue_add_buf(vi->svq, vi->tx_sg, hdr->num_sg,
>> + hdr->num_sg = skb_to_sgvec(skb, sg + 1, 0, skb->len) + 1;
>> + return virtqueue_add_buf(vq, sg, hdr->num_sg,
>> 0, skb, GFP_ATOMIC);
>> }
>>
>> static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
>> {
>> struct virtnet_info *vi = netdev_priv(dev);
>> + int qnum = skb_get_queue_mapping(skb);
>> + struct virtqueue *vq = vi->sq[qnum]->vq;
>> int capacity;
>>
>> /* Free up any pending old buffers before queueing new ones. */
>> - free_old_xmit_skbs(vi);
>> + free_old_xmit_skbs(vi, vq);
>>
>> /* Try to transmit */
>> - capacity = xmit_skb(vi, skb);
>> + capacity = xmit_skb(vi, skb, vq, vi->sq[qnum]->sg);
>>
>> /* This can happen with OOM and indirect buffers. */
>> if (unlikely(capacity< 0)) {
>> if (likely(capacity == -ENOMEM)) {
>> if (net_ratelimit())
>> dev_warn(&dev->dev,
>> - "TX queue failure: out of memory\n");
>> + "TXQ (%d) failure: out of memory\n",
>> + qnum);
>> } else {
>> dev->stats.tx_fifo_errors++;
>> if (net_ratelimit())
>> dev_warn(&dev->dev,
>> - "Unexpected TX queue failure: %d\n",
>> - capacity);
>> + "Unexpected TXQ (%d) failure: %d\n",
>> + qnum, capacity);
>> }
>> dev->stats.tx_dropped++;
>> kfree_skb(skb);
>> return NETDEV_TX_OK;
>> }
>> - virtqueue_kick(vi->svq);
>> + virtqueue_kick(vq);
>>
>> /* Don't wait up for transmitted skbs to be freed. */
>> skb_orphan(skb);
>> @@ -661,13 +721,13 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
>> /* Apparently nice girls don't return TX_BUSY; stop the queue
>> * before it gets out of hand. Naturally, this wastes entries. */
>> if (capacity< 2+MAX_SKB_FRAGS) {
>> - netif_stop_queue(dev);
>> - if (unlikely(!virtqueue_enable_cb_delayed(vi->svq))) {
>> + netif_stop_subqueue(dev, qnum);
>> + if (unlikely(!virtqueue_enable_cb_delayed(vq))) {
>> /* More just got used, free them then recheck. */
>> - capacity += free_old_xmit_skbs(vi);
>> + capacity += free_old_xmit_skbs(vi, vq);
>> if (capacity>= 2+MAX_SKB_FRAGS) {
>> - netif_start_queue(dev);
>> - virtqueue_disable_cb(vi->svq);
>> + netif_start_subqueue(dev, qnum);
>> + virtqueue_disable_cb(vq);
>> }
>> }
>> }
>> @@ -700,7 +760,8 @@ static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev,
>> unsigned int start;
>>
>> for_each_possible_cpu(cpu) {
>> - struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu);
>> + struct virtnet_stats __percpu *stats
>> + = per_cpu_ptr(vi->stats, cpu);
>> u64 tpackets, tbytes, rpackets, rbytes;
>>
>> do {
>> @@ -734,20 +795,26 @@ static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev,
>> static void virtnet_netpoll(struct net_device *dev)
>> {
>> struct virtnet_info *vi = netdev_priv(dev);
>> + int i;
>>
>> - napi_schedule(&vi->napi);
>> + for (i = 0; i< vi->num_queue_pairs; i++)
>> + napi_schedule(&vi->rq[i]->napi);
>> }
>> #endif
>>
>> static int virtnet_open(struct net_device *dev)
>> {
>> struct virtnet_info *vi = netdev_priv(dev);
>> + int i;
>>
>> - /* Make sure we have some buffers: if oom use wq. */
>> - if (!try_fill_recv(vi, GFP_KERNEL))
>> - queue_delayed_work(system_nrt_wq,&vi->refill, 0);
>> + for (i = 0; i< vi->num_queue_pairs; i++) {
>> + /* Make sure we have some buffers: if oom use wq. */
>> + if (!try_fill_recv(vi->rq[i], GFP_KERNEL))
>> + queue_delayed_work(system_nrt_wq,
>> + &vi->rq[i]->refill, 0);
>> + virtnet_napi_enable(vi->rq[i]);
>> + }
>>
>> - virtnet_napi_enable(vi);
>> return 0;
>> }
>>
>> @@ -809,10 +876,13 @@ static void virtnet_ack_link_announce(struct virtnet_info *vi)
>> static int virtnet_close(struct net_device *dev)
>> {
>> struct virtnet_info *vi = netdev_priv(dev);
>> + int i;
>>
>> /* Make sure refill_work doesn't re-enable napi! */
>> - cancel_delayed_work_sync(&vi->refill);
>> - napi_disable(&vi->napi);
>> + for (i = 0; i< vi->num_queue_pairs; i++) {
>> + cancel_delayed_work_sync(&vi->rq[i]->refill);
>> + napi_disable(&vi->rq[i]->napi);
>> + }
>>
>> return 0;
>> }
>> @@ -924,11 +994,10 @@ static void virtnet_get_ringparam(struct net_device *dev,
>> {
>> struct virtnet_info *vi = netdev_priv(dev);
>>
>> - ring->rx_max_pending = virtqueue_get_vring_size(vi->rvq);
>> - ring->tx_max_pending = virtqueue_get_vring_size(vi->svq);
>> + ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0]->vq);
>> + ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0]->vq);
>> ring->rx_pending = ring->rx_max_pending;
>> ring->tx_pending = ring->tx_max_pending;
>> -
>> }
>>
>>
>> @@ -961,6 +1030,19 @@ static int virtnet_change_mtu(struct net_device *dev, int new_mtu)
>> return 0;
>> }
>>
>> +/* To avoid contending a lock hold by a vcpu who would exit to host, select the
>> + * txq based on the processor id.
>> + */
>> +static u16 virtnet_select_queue(struct net_device *dev, struct sk_buff *skb)
>> +{
>> + int txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) :
>> + smp_processor_id();
>> +
>> + while (unlikely(txq>= dev->real_num_tx_queues))
>> + txq -= dev->real_num_tx_queues;
>> + return txq;
>> +}
>> +
>> static const struct net_device_ops virtnet_netdev = {
>> .ndo_open = virtnet_open,
>> .ndo_stop = virtnet_close,
>> @@ -972,6 +1054,7 @@ static const struct net_device_ops virtnet_netdev = {
>> .ndo_get_stats64 = virtnet_stats,
>> .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
>> .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
>> + .ndo_select_queue = virtnet_select_queue,
>> #ifdef CONFIG_NET_POLL_CONTROLLER
>> .ndo_poll_controller = virtnet_netpoll,
>> #endif
>> @@ -1007,10 +1090,10 @@ static void virtnet_config_changed_work(struct work_struct *work)
>>
>> if (vi->status& VIRTIO_NET_S_LINK_UP) {
>> netif_carrier_on(vi->dev);
>> - netif_wake_queue(vi->dev);
>> + netif_tx_wake_all_queues(vi->dev);
>> } else {
>> netif_carrier_off(vi->dev);
>> - netif_stop_queue(vi->dev);
>> + netif_tx_stop_all_queues(vi->dev);
>> }
>> done:
>> mutex_unlock(&vi->config_lock);
>> @@ -1023,41 +1106,217 @@ static void virtnet_config_changed(struct virtio_device *vdev)
>> queue_work(system_nrt_wq,&vi->config_work);
>> }
>>
>> -static int init_vqs(struct virtnet_info *vi)
>> +static void free_receive_bufs(struct virtnet_info *vi)
>> +{
>> + int i;
>> +
>> + for (i = 0; i< vi->num_queue_pairs; i++) {
>> + while (vi->rq[i]->pages)
>> + __free_pages(get_a_page(vi->rq[i], GFP_KERNEL), 0);
>> + }
>> +}
>> +
>> +/* Free memory allocated for send and receive queues */
>> +static void virtnet_free_queues(struct virtnet_info *vi)
>> {
>> - struct virtqueue *vqs[3];
>> - vq_callback_t *callbacks[] = { skb_recv_done, skb_xmit_done, NULL};
>> - const char *names[] = { "input", "output", "control" };
>> - int nvqs, err;
>> + int i;
>>
>> - /* We expect two virtqueues, receive then send,
>> - * and optionally control. */
>> - nvqs = virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ? 3 : 2;
>> + for (i = 0; i< vi->num_queue_pairs; i++) {
>> + kfree(vi->rq[i]);
>> + vi->rq[i] = NULL;
>> + kfree(vi->sq[i]);
>> + vi->sq[i] = NULL;
>> + }
>> +}
>>
>> - err = vi->vdev->config->find_vqs(vi->vdev, nvqs, vqs, callbacks, names);
>> - if (err)
>> - return err;
>> +static void free_unused_bufs(struct virtnet_info *vi)
>> +{
>> + void *buf;
>> + int i;
>> +
>> + for (i = 0; i< vi->num_queue_pairs; i++) {
>> + struct virtqueue *vq = vi->sq[i]->vq;
>> +
>> + while ((buf = virtqueue_detach_unused_buf(vq)) != NULL)
>> + dev_kfree_skb(buf);
>> + }
>> +
>> + for (i = 0; i< vi->num_queue_pairs; i++) {
>> + struct virtqueue *vq = vi->rq[i]->vq;
>> +
>> + while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) {
>> + if (vi->mergeable_rx_bufs || vi->big_packets)
>> + give_pages(vi->rq[i], buf);
>> + else
>> + dev_kfree_skb(buf);
>> + --vi->rq[i]->num;
>> + }
>> + BUG_ON(vi->rq[i]->num != 0);
>> + }
>> +}
>> +
>> +static void virtnet_set_affinity(struct virtnet_info *vi, bool set)
>> +{
>> + int i;
>> +
>> + if (vi->num_queue_pairs == 1)
>> + return;
>> +
>> + for (i = 0; i< vi->num_queue_pairs; i++) {
>> + int cpu = set ? i : -1;
>> + virtqueue_set_affinity(vi->rq[i]->vq, cpu);
>> + virtqueue_set_affinity(vi->sq[i]->vq, cpu);
>> + }
>> + return;
>> +}
>> +
>> +static void virtnet_del_vqs(struct virtnet_info *vi)
>> +{
>> + struct virtio_device *vdev = vi->vdev;
>> +
>> + virtnet_set_affinity(vi, false);
>> +
>> + vdev->config->del_vqs(vdev);
>> +
>> + virtnet_free_queues(vi);
>> +}
>> +
>> +static int virtnet_find_vqs(struct virtnet_info *vi)
>> +{
>> + vq_callback_t **callbacks;
>> + struct virtqueue **vqs;
>> + int ret = -ENOMEM;
>> + int i, total_vqs;
>> + char **names;
>>
>> - vi->rvq = vqs[0];
>> - vi->svq = vqs[1];
>> + /*
>> + * We expect 1 RX virtqueue followed by 1 TX virtqueue, followd by
>> + * possible control virtqueue and followed by the same
>> + * 'vi->num_queue_pairs-1' more times
>> + */
>> + total_vqs = vi->num_queue_pairs * 2 +
>> + virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ);
>> +
>> + /* Allocate space for find_vqs parameters */
>> + vqs = kmalloc(total_vqs * sizeof(*vqs), GFP_KERNEL);
>> + callbacks = kmalloc(total_vqs * sizeof(*callbacks), GFP_KERNEL);
>> + names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL);
> so this needs to be kzalloc otherwise on an error cleanup will
> get uninitialized data and crash?

Yes, will change it to use kzalloc.
>
>> + if (!vqs || !callbacks || !names)
>> + goto err;
>> +
>> + /* Parameters for control virtqueue, if any */
>> + if (vi->has_cvq) {
>> + callbacks[2] = NULL;
>> + names[2] = "control";
>> + }
>> +
>> + /* Allocate/initialize parameters for send/receive virtqueues */
>> + for (i = 0; i< vi->num_queue_pairs * 2; i += 2) {
>> + int j = (i == 0 ? i : i + vi->has_cvq);
>> + callbacks[j] = skb_recv_done;
>> + callbacks[j + 1] = skb_xmit_done;
>> + names[j] = kasprintf(GFP_KERNEL, "input.%d", i / 2);
>> + names[j + 1] = kasprintf(GFP_KERNEL, "output.%d", i / 2);
> This needs wrappers. E.g. virtnet_rx_vq(int queue_pair), virtnet_tx_vq(int queue_pair);
> Then you would just scan 0 to num_queue_pairs, and i is queue pair
> number.

Ok.
>> + }
>>
>> - if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) {
>> + ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks,
>> + (const char **)names);
>> + if (ret)
>> + goto err;
>> +
>> + if (vi->has_cvq)
>> vi->cvq = vqs[2];
>>
>> - if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
>> - vi->dev->features |= NETIF_F_HW_VLAN_FILTER;
>> + for (i = 0; i< vi->num_queue_pairs * 2; i += 2) {
>> + int j = i == 0 ? i : i + vi->has_cvq;
>> + vi->rq[i / 2]->vq = vqs[j];
>> + vi->sq[i / 2]->vq = vqs[j + 1];
> Same here.

Consider the code is really simple, seem no need to use helpers.
>
>> }
>> - return 0;
>> +
>> +err:
>> + if (ret&& names)
> If we are here ret != 0. For names, just add another label, don't
> complicate cleanup.

Ok.
>> + for (i = 0; i< vi->num_queue_pairs * 2; i++)
>> + kfree(names[i]);
>> +
>> + kfree(names);
>> + kfree(callbacks);
>> + kfree(vqs);
>> +
>> + return ret;
>> +}
>> +
>> +static int virtnet_alloc_queues(struct virtnet_info *vi)
>> +{
>> + int ret = -ENOMEM;
>> + int i;
>> +
>> + for (i = 0; i< vi->num_queue_pairs; i++) {
>> + vi->rq[i] = kzalloc(sizeof(*vi->rq[i]), GFP_KERNEL);
>> + vi->sq[i] = kzalloc(sizeof(*vi->sq[i]), GFP_KERNEL);
>> + if (!vi->rq[i] || !vi->sq[i])
>> + goto err;
>> + }
>> +
>> + ret = 0;
>> +
>> + /* setup initial receive and send queue parameters */
>> + for (i = 0; i< vi->num_queue_pairs; i++) {
>> + vi->rq[i]->vi = vi;
>> + vi->rq[i]->pages = NULL;
>> + INIT_DELAYED_WORK(&vi->rq[i]->refill, refill_work);
>> + netif_napi_add(vi->dev,&vi->rq[i]->napi, virtnet_poll,
>> + napi_weight);
>> +
>> + sg_init_table(vi->rq[i]->sg, ARRAY_SIZE(vi->rq[i]->sg));
>> + sg_init_table(vi->sq[i]->sg, ARRAY_SIZE(vi->sq[i]->sg));
>> + }
>> +
> Add return 0 here, then ret = 0 will not be needed
> above and if (ret) below.
>

Ok.
>> +err:
>> + if (ret)
>> + virtnet_free_queues(vi);
>> +
>> + return ret;
>> +}
>> +
>> +static int virtnet_setup_vqs(struct virtnet_info *vi)
>> +{
>> + int ret;
>> +
>> + /* Allocate send& receive queues */
>> + ret = virtnet_alloc_queues(vi);
>> + if (!ret) {
>> + ret = virtnet_find_vqs(vi);
>> + if (ret)
>> + virtnet_free_queues(vi);
>> + else
>> + virtnet_set_affinity(vi, true);
>> + }
>> +
>> + return ret;
> Add some labels for error handling, this if nesting is messy.

Ok.
>> }
>>
>> static int virtnet_probe(struct virtio_device *vdev)
>> {
>> - int err;
>> + int i, err;
>> struct net_device *dev;
>> struct virtnet_info *vi;
>> + u16 num_queues, num_queue_pairs;
>> +
>> + /* Find if host supports multiqueue virtio_net device */
>> + err = virtio_config_val(vdev, VIRTIO_NET_F_MULTIQUEUE,
>> + offsetof(struct virtio_net_config,
>> + num_queues),&num_queues);
>> +
>> + /* We need atleast 2 queue's */
> typo

Will fix this, thanks.
>> + if (err || num_queues< 2)
>> + num_queues = 2;
>> + if (num_queues> MAX_QUEUES * 2)
>> + num_queues = MAX_QUEUES;
>> +
>> + num_queue_pairs = num_queues / 2;
>>
>> /* Allocate ourselves a network device with room for our info */
>> - dev = alloc_etherdev(sizeof(struct virtnet_info));
>> + dev = alloc_etherdev_mq(sizeof(struct virtnet_info), num_queue_pairs);
>> if (!dev)
>> return -ENOMEM;
>>
>> @@ -1103,22 +1362,18 @@ static int virtnet_probe(struct virtio_device *vdev)
>>
>> /* Set up our device-specific information */
>> vi = netdev_priv(dev);
>> - netif_napi_add(dev,&vi->napi, virtnet_poll, napi_weight);
>> vi->dev = dev;
>> vi->vdev = vdev;
>> vdev->priv = vi;
>> - vi->pages = NULL;
>> vi->stats = alloc_percpu(struct virtnet_stats);
>> err = -ENOMEM;
>> if (vi->stats == NULL)
>> - goto free;
>> + goto free_netdev;
>>
>> - INIT_DELAYED_WORK(&vi->refill, refill_work);
>> mutex_init(&vi->config_lock);
>> vi->config_enable = true;
>> INIT_WORK(&vi->config_work, virtnet_config_changed_work);
>> - sg_init_table(vi->rx_sg, ARRAY_SIZE(vi->rx_sg));
>> - sg_init_table(vi->tx_sg, ARRAY_SIZE(vi->tx_sg));
>> + vi->num_queue_pairs = num_queue_pairs;
>>
>> /* If we can receive ANY GSO packets, we must allocate large ones. */
>> if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
>> @@ -1129,9 +1384,17 @@ static int virtnet_probe(struct virtio_device *vdev)
>> if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
>> vi->mergeable_rx_bufs = true;
>>
>> - err = init_vqs(vi);
>> + if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
>> + vi->has_cvq = true;
>> +
> How about we disable multiqueue if there's no cvq?
> Will make logic a bit simpler, won't it?

We can, but as you said, just let the logic simpler a bit.
>> + /* Allocate/initialize the rx/tx queues, and invoke find_vqs */
>> + err = virtnet_setup_vqs(vi);
>> if (err)
>> - goto free_stats;
>> + goto free_netdev;
>> +
>> + if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)&&
>> + virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
>> + dev->features |= NETIF_F_HW_VLAN_FILTER;
>>
>> err = register_netdev(dev);
>> if (err) {
>> @@ -1140,12 +1403,15 @@ static int virtnet_probe(struct virtio_device *vdev)
>> }
>>
>> /* Last of all, set up some receive buffers. */
>> - try_fill_recv(vi, GFP_KERNEL);
>> -
>> - /* If we didn't even get one input buffer, we're useless. */
>> - if (vi->num == 0) {
>> - err = -ENOMEM;
>> - goto unregister;
>> + for (i = 0; i< num_queue_pairs; i++) {
>> + try_fill_recv(vi->rq[i], GFP_KERNEL);
>> +
>> + /* If we didn't even get one input buffer, we're useless. */
>> + if (vi->rq[i]->num == 0) {
>> + free_unused_bufs(vi);
>> + err = -ENOMEM;
>> + goto free_recv_bufs;
>> + }
>> }
>>
>> /* Assume link up if device can't report link status,
>> @@ -1158,42 +1424,25 @@ static int virtnet_probe(struct virtio_device *vdev)
>> netif_carrier_on(dev);
>> }
>>
>> - pr_debug("virtnet: registered device %s\n", dev->name);
>> + pr_debug("virtnet: registered device %s with %d RX and TX vq's\n",
>> + dev->name, num_queue_pairs);
>> +
>> return 0;
>>
>> -unregister:
>> +free_recv_bufs:
>> + free_receive_bufs(vi);
>> unregister_netdev(dev);
>> +
>> free_vqs:
>> - vdev->config->del_vqs(vdev);
>> -free_stats:
>> - free_percpu(vi->stats);
>> -free:
>> + for (i = 0; i< num_queue_pairs; i++)
>> + cancel_delayed_work_sync(&vi->rq[i]->refill);
>> + virtnet_del_vqs(vi);
>> +
>> +free_netdev:
>> free_netdev(dev);
>> return err;
>> }
>>
>> -static void free_unused_bufs(struct virtnet_info *vi)
>> -{
>> - void *buf;
>> - while (1) {
>> - buf = virtqueue_detach_unused_buf(vi->svq);
>> - if (!buf)
>> - break;
>> - dev_kfree_skb(buf);
>> - }
>> - while (1) {
>> - buf = virtqueue_detach_unused_buf(vi->rvq);
>> - if (!buf)
>> - break;
>> - if (vi->mergeable_rx_bufs || vi->big_packets)
>> - give_pages(vi, buf);
>> - else
>> - dev_kfree_skb(buf);
>> - --vi->num;
>> - }
>> - BUG_ON(vi->num != 0);
>> -}
>> -
>> static void remove_vq_common(struct virtnet_info *vi)
>> {
>> vi->vdev->config->reset(vi->vdev);
>> @@ -1201,10 +1450,9 @@ static void remove_vq_common(struct virtnet_info *vi)
>> /* Free unused buffers in both send and recv, if any. */
>> free_unused_bufs(vi);
>>
>> - vi->vdev->config->del_vqs(vi->vdev);
>> + free_receive_bufs(vi);
>>
>> - while (vi->pages)
>> - __free_pages(get_a_page(vi, GFP_KERNEL), 0);
>> + virtnet_del_vqs(vi);
>> }
>>
>> static void __devexit virtnet_remove(struct virtio_device *vdev)
>> @@ -1230,6 +1478,7 @@ static void __devexit virtnet_remove(struct virtio_device *vdev)
>> static int virtnet_freeze(struct virtio_device *vdev)
>> {
>> struct virtnet_info *vi = vdev->priv;
>> + int i;
>>
>> /* Prevent config work handler from accessing the device */
>> mutex_lock(&vi->config_lock);
>> @@ -1237,10 +1486,13 @@ static int virtnet_freeze(struct virtio_device *vdev)
>> mutex_unlock(&vi->config_lock);
>>
>> netif_device_detach(vi->dev);
>> - cancel_delayed_work_sync(&vi->refill);
>> + for (i = 0; i< vi->num_queue_pairs; i++)
>> + cancel_delayed_work_sync(&vi->rq[i]->refill);
>>
>> if (netif_running(vi->dev))
>> - napi_disable(&vi->napi);
>> + for (i = 0; i< vi->num_queue_pairs; i++)
>> + napi_disable(&vi->rq[i]->napi);
>> +
>>
>> remove_vq_common(vi);
>>
>> @@ -1252,19 +1504,22 @@ static int virtnet_freeze(struct virtio_device *vdev)
>> static int virtnet_restore(struct virtio_device *vdev)
>> {
>> struct virtnet_info *vi = vdev->priv;
>> - int err;
>> + int err, i;
>>
>> - err = init_vqs(vi);
>> + err = virtnet_setup_vqs(vi);
>> if (err)
>> return err;
>>
>> if (netif_running(vi->dev))
>> - virtnet_napi_enable(vi);
>> + for (i = 0; i< vi->num_queue_pairs; i++)
>> + virtnet_napi_enable(vi->rq[i]);
>>
>> netif_device_attach(vi->dev);
>>
>> - if (!try_fill_recv(vi, GFP_KERNEL))
>> - queue_delayed_work(system_nrt_wq,&vi->refill, 0);
>> + for (i = 0; i< vi->num_queue_pairs; i++)
>> + if (!try_fill_recv(vi->rq[i], GFP_KERNEL))
>> + queue_delayed_work(system_nrt_wq,
>> + &vi->rq[i]->refill, 0);
>>
>> mutex_lock(&vi->config_lock);
>> vi->config_enable = true;
>> @@ -1287,7 +1542,7 @@ static unsigned int features[] = {
>> VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO,
>> VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ,
>> VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN,
>> - VIRTIO_NET_F_GUEST_ANNOUNCE,
>> + VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MULTIQUEUE,
>> };
>>
>> static struct virtio_driver virtio_net_driver = {
>> diff --git a/include/linux/virtio_net.h b/include/linux/virtio_net.h
>> index 1bc7e30..60f09ff 100644
>> --- a/include/linux/virtio_net.h
>> +++ b/include/linux/virtio_net.h
>> @@ -61,6 +61,8 @@ struct virtio_net_config {
>> __u8 mac[6];
>> /* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */
>> __u16 status;
>> + /* Total number of RX/TX queues */
>> + __u16 num_queues;
>> } __attribute__((packed));
>>
>> /* This is the first element of the scatter-gather list. If you don't
>> --
>> 1.7.1



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