virtio_net: Defer skb allocation in receive path Date: Wed, 13 Jan 2010 12:53:38 -0800
virtio_net receives packets from its pre-allocated vring buffers, then it delivers these packets to upper layer protocols as skb buffs. So it's not necessary to pre-allocate skb for each mergable buffer, then frees extra skbs when buffers are merged into a large packet. This patch has deferred skb allocation in receiving packets for both big packets and mergeable buffers to reduce skb pre-allocations and skb frees. It frees unused buffers by calling detach_unused_buf in vring, so recv skb queue is not needed. Signed-off-by: Shirley Ma <xma@us.ibm.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Shirley Ma
David S. Miller
parent
f9bfbebf34
commit
9ab86bbcf8
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@ -56,8 +56,7 @@ struct virtnet_info
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/* Host will merge rx buffers for big packets (shake it! shake it!) */
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bool mergeable_rx_bufs;
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/* Receive & send queues. */
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struct sk_buff_head recv;
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/* Send queue. */
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struct sk_buff_head send;
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/* Work struct for refilling if we run low on memory. */
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@ -75,34 +74,44 @@ struct skb_vnet_hdr {
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unsigned int num_sg;
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};
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struct padded_vnet_hdr {
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struct virtio_net_hdr hdr;
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/*
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* virtio_net_hdr should be in a separated sg buffer because of a
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* QEMU bug, and data sg buffer shares same page with this header sg.
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* This padding makes next sg 16 byte aligned after virtio_net_hdr.
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*/
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char padding[6];
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};
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static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb)
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{
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return (struct skb_vnet_hdr *)skb->cb;
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}
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static void give_a_page(struct virtnet_info *vi, struct page *page)
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/*
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* private is used to chain pages for big packets, put the whole
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* most recent used list in the beginning for reuse
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*/
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static void give_pages(struct virtnet_info *vi, struct page *page)
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{
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page->private = (unsigned long)vi->pages;
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struct page *end;
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/* Find end of list, sew whole thing into vi->pages. */
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for (end = page; end->private; end = (struct page *)end->private);
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end->private = (unsigned long)vi->pages;
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vi->pages = page;
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}
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static void trim_pages(struct virtnet_info *vi, struct sk_buff *skb)
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{
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unsigned int i;
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for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
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give_a_page(vi, skb_shinfo(skb)->frags[i].page);
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skb_shinfo(skb)->nr_frags = 0;
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skb->data_len = 0;
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}
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static struct page *get_a_page(struct virtnet_info *vi, gfp_t gfp_mask)
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{
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struct page *p = vi->pages;
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if (p)
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if (p) {
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vi->pages = (struct page *)p->private;
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else
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/* clear private here, it is used to chain pages */
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p->private = 0;
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} else
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p = alloc_page(gfp_mask);
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return p;
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}
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@ -118,99 +127,142 @@ static void skb_xmit_done(struct virtqueue *svq)
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netif_wake_queue(vi->dev);
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}
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static void receive_skb(struct net_device *dev, struct sk_buff *skb,
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unsigned len)
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static void set_skb_frag(struct sk_buff *skb, struct page *page,
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unsigned int offset, unsigned int *len)
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{
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int i = skb_shinfo(skb)->nr_frags;
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skb_frag_t *f;
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f = &skb_shinfo(skb)->frags[i];
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f->size = min((unsigned)PAGE_SIZE - offset, *len);
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f->page_offset = offset;
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f->page = page;
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skb->data_len += f->size;
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skb->len += f->size;
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skb_shinfo(skb)->nr_frags++;
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*len -= f->size;
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}
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static struct sk_buff *page_to_skb(struct virtnet_info *vi,
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struct page *page, unsigned int len)
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{
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struct sk_buff *skb;
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struct skb_vnet_hdr *hdr;
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unsigned int copy, hdr_len, offset;
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char *p;
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p = page_address(page);
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/* copy small packet so we can reuse these pages for small data */
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skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN);
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if (unlikely(!skb))
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return NULL;
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hdr = skb_vnet_hdr(skb);
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if (vi->mergeable_rx_bufs) {
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hdr_len = sizeof hdr->mhdr;
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offset = hdr_len;
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} else {
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hdr_len = sizeof hdr->hdr;
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offset = sizeof(struct padded_vnet_hdr);
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}
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memcpy(hdr, p, hdr_len);
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len -= hdr_len;
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p += offset;
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copy = len;
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if (copy > skb_tailroom(skb))
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copy = skb_tailroom(skb);
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memcpy(skb_put(skb, copy), p, copy);
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len -= copy;
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offset += copy;
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while (len) {
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set_skb_frag(skb, page, offset, &len);
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page = (struct page *)page->private;
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offset = 0;
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}
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if (page)
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give_pages(vi, page);
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return skb;
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}
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static int receive_mergeable(struct virtnet_info *vi, struct sk_buff *skb)
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{
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struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
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struct page *page;
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int num_buf, i, len;
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num_buf = hdr->mhdr.num_buffers;
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while (--num_buf) {
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i = skb_shinfo(skb)->nr_frags;
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if (i >= MAX_SKB_FRAGS) {
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pr_debug("%s: packet too long\n", skb->dev->name);
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skb->dev->stats.rx_length_errors++;
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return -EINVAL;
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}
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page = vi->rvq->vq_ops->get_buf(vi->rvq, &len);
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if (!page) {
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pr_debug("%s: rx error: %d buffers missing\n",
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skb->dev->name, hdr->mhdr.num_buffers);
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skb->dev->stats.rx_length_errors++;
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return -EINVAL;
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}
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if (len > PAGE_SIZE)
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len = PAGE_SIZE;
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set_skb_frag(skb, page, 0, &len);
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--vi->num;
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}
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return 0;
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}
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static void receive_buf(struct net_device *dev, void *buf, unsigned int len)
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{
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struct virtnet_info *vi = netdev_priv(dev);
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struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
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int err;
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int i;
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struct sk_buff *skb;
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struct page *page;
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struct skb_vnet_hdr *hdr;
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if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) {
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pr_debug("%s: short packet %i\n", dev->name, len);
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dev->stats.rx_length_errors++;
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goto drop;
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if (vi->mergeable_rx_bufs || vi->big_packets)
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give_pages(vi, buf);
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else
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dev_kfree_skb(buf);
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return;
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}
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if (vi->mergeable_rx_bufs) {
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unsigned int copy;
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char *p = page_address(skb_shinfo(skb)->frags[0].page);
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if (len > PAGE_SIZE)
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len = PAGE_SIZE;
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len -= sizeof(struct virtio_net_hdr_mrg_rxbuf);
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memcpy(&hdr->mhdr, p, sizeof(hdr->mhdr));
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p += sizeof(hdr->mhdr);
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copy = len;
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if (copy > skb_tailroom(skb))
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copy = skb_tailroom(skb);
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memcpy(skb_put(skb, copy), p, copy);
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len -= copy;
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if (!len) {
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give_a_page(vi, skb_shinfo(skb)->frags[0].page);
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skb_shinfo(skb)->nr_frags--;
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} else {
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skb_shinfo(skb)->frags[0].page_offset +=
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sizeof(hdr->mhdr) + copy;
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skb_shinfo(skb)->frags[0].size = len;
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skb->data_len += len;
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skb->len += len;
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}
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while (--hdr->mhdr.num_buffers) {
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struct sk_buff *nskb;
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i = skb_shinfo(skb)->nr_frags;
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if (i >= MAX_SKB_FRAGS) {
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pr_debug("%s: packet too long %d\n", dev->name,
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len);
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dev->stats.rx_length_errors++;
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goto drop;
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}
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nskb = vi->rvq->vq_ops->get_buf(vi->rvq, &len);
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if (!nskb) {
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pr_debug("%s: rx error: %d buffers missing\n",
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dev->name, hdr->mhdr.num_buffers);
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dev->stats.rx_length_errors++;
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goto drop;
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}
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__skb_unlink(nskb, &vi->recv);
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vi->num--;
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skb_shinfo(skb)->frags[i] = skb_shinfo(nskb)->frags[0];
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skb_shinfo(nskb)->nr_frags = 0;
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kfree_skb(nskb);
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if (len > PAGE_SIZE)
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len = PAGE_SIZE;
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skb_shinfo(skb)->frags[i].size = len;
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skb_shinfo(skb)->nr_frags++;
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skb->data_len += len;
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skb->len += len;
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}
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if (!vi->mergeable_rx_bufs && !vi->big_packets) {
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skb = buf;
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len -= sizeof(struct virtio_net_hdr);
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skb_trim(skb, len);
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} else {
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len -= sizeof(hdr->hdr);
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if (len <= MAX_PACKET_LEN)
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trim_pages(vi, skb);
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err = pskb_trim(skb, len);
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if (err) {
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pr_debug("%s: pskb_trim failed %i %d\n", dev->name,
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len, err);
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page = buf;
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skb = page_to_skb(vi, page, len);
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if (unlikely(!skb)) {
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dev->stats.rx_dropped++;
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goto drop;
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give_pages(vi, page);
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return;
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}
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if (vi->mergeable_rx_bufs)
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if (receive_mergeable(vi, skb)) {
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dev_kfree_skb(skb);
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return;
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}
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}
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hdr = skb_vnet_hdr(skb);
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skb->truesize += skb->data_len;
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dev->stats.rx_bytes += skb->len;
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dev->stats.rx_packets++;
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@ -267,110 +319,119 @@ static void receive_skb(struct net_device *dev, struct sk_buff *skb,
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frame_err:
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dev->stats.rx_frame_errors++;
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drop:
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dev_kfree_skb(skb);
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}
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static bool try_fill_recv_maxbufs(struct virtnet_info *vi, gfp_t gfp)
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static int add_recvbuf_small(struct virtnet_info *vi, gfp_t gfp)
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{
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struct sk_buff *skb;
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struct scatterlist sg[2+MAX_SKB_FRAGS];
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int num, err, i;
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bool oom = false;
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struct skb_vnet_hdr *hdr;
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struct scatterlist sg[2];
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int err;
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sg_init_table(sg, 2+MAX_SKB_FRAGS);
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do {
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struct skb_vnet_hdr *hdr;
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skb = netdev_alloc_skb_ip_align(vi->dev, MAX_PACKET_LEN);
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if (unlikely(!skb))
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return -ENOMEM;
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skb = netdev_alloc_skb_ip_align(vi->dev, MAX_PACKET_LEN);
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if (unlikely(!skb)) {
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oom = true;
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break;
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skb_put(skb, MAX_PACKET_LEN);
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hdr = skb_vnet_hdr(skb);
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sg_set_buf(sg, &hdr->hdr, sizeof hdr->hdr);
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skb_to_sgvec(skb, sg + 1, 0, skb->len);
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err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, 2, skb);
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if (err < 0)
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dev_kfree_skb(skb);
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return err;
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}
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static int add_recvbuf_big(struct virtnet_info *vi, gfp_t gfp)
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{
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struct scatterlist sg[MAX_SKB_FRAGS + 2];
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struct page *first, *list = NULL;
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char *p;
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int i, err, offset;
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/* page in sg[MAX_SKB_FRAGS + 1] is list tail */
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for (i = MAX_SKB_FRAGS + 1; i > 1; --i) {
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first = get_a_page(vi, gfp);
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if (!first) {
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if (list)
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give_pages(vi, list);
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return -ENOMEM;
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}
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sg_set_buf(&sg[i], page_address(first), PAGE_SIZE);
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skb_put(skb, MAX_PACKET_LEN);
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/* chain new page in list head to match sg */
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first->private = (unsigned long)list;
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list = first;
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}
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hdr = skb_vnet_hdr(skb);
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sg_set_buf(sg, &hdr->hdr, sizeof(hdr->hdr));
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first = get_a_page(vi, gfp);
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if (!first) {
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give_pages(vi, list);
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return -ENOMEM;
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}
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p = page_address(first);
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if (vi->big_packets) {
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for (i = 0; i < MAX_SKB_FRAGS; i++) {
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skb_frag_t *f = &skb_shinfo(skb)->frags[i];
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f->page = get_a_page(vi, gfp);
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if (!f->page)
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break;
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/* sg[0], sg[1] share the same page */
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/* a separated sg[0] for virtio_net_hdr only during to QEMU bug*/
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sg_set_buf(&sg[0], p, sizeof(struct virtio_net_hdr));
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f->page_offset = 0;
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f->size = PAGE_SIZE;
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/* sg[1] for data packet, from offset */
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offset = sizeof(struct padded_vnet_hdr);
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sg_set_buf(&sg[1], p + offset, PAGE_SIZE - offset);
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skb->data_len += PAGE_SIZE;
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skb->len += PAGE_SIZE;
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/* chain first in list head */
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first->private = (unsigned long)list;
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err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, MAX_SKB_FRAGS + 2,
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first);
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if (err < 0)
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give_pages(vi, first);
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skb_shinfo(skb)->nr_frags++;
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}
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}
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return err;
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}
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num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1;
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skb_queue_head(&vi->recv, skb);
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static int add_recvbuf_mergeable(struct virtnet_info *vi, gfp_t gfp)
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{
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struct page *page;
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struct scatterlist sg;
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int err;
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err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, num, skb);
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if (err < 0) {
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skb_unlink(skb, &vi->recv);
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trim_pages(vi, skb);
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kfree_skb(skb);
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break;
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}
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vi->num++;
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} while (err >= num);
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if (unlikely(vi->num > vi->max))
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vi->max = vi->num;
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vi->rvq->vq_ops->kick(vi->rvq);
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return !oom;
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page = get_a_page(vi, gfp);
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if (!page)
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return -ENOMEM;
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sg_init_one(&sg, page_address(page), PAGE_SIZE);
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err = vi->rvq->vq_ops->add_buf(vi->rvq, &sg, 0, 1, page);
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if (err < 0)
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give_pages(vi, page);
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return err;
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}
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/* Returns false if we couldn't fill entirely (OOM). */
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static bool try_fill_recv(struct virtnet_info *vi, gfp_t gfp)
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{
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struct sk_buff *skb;
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struct scatterlist sg[1];
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int err;
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bool oom = false;
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if (!vi->mergeable_rx_bufs)
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return try_fill_recv_maxbufs(vi, gfp);
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do {
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skb_frag_t *f;
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if (vi->mergeable_rx_bufs)
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err = add_recvbuf_mergeable(vi, gfp);
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else if (vi->big_packets)
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err = add_recvbuf_big(vi, gfp);
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else
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err = add_recvbuf_small(vi, gfp);
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skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN);
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if (unlikely(!skb)) {
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oom = true;
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break;
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}
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f = &skb_shinfo(skb)->frags[0];
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f->page = get_a_page(vi, gfp);
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if (!f->page) {
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oom = true;
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kfree_skb(skb);
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break;
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}
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f->page_offset = 0;
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f->size = PAGE_SIZE;
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skb_shinfo(skb)->nr_frags++;
|
||||
|
||||
sg_init_one(sg, page_address(f->page), PAGE_SIZE);
|
||||
skb_queue_head(&vi->recv, skb);
|
||||
|
||||
err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, 1, skb);
|
||||
if (err < 0) {
|
||||
skb_unlink(skb, &vi->recv);
|
||||
kfree_skb(skb);
|
||||
oom = true;
|
||||
break;
|
||||
}
|
||||
vi->num++;
|
||||
++vi->num;
|
||||
} while (err > 0);
|
||||
if (unlikely(vi->num > vi->max))
|
||||
vi->max = vi->num;
|
||||
|
|
@ -407,15 +468,14 @@ static void refill_work(struct work_struct *work)
|
|||
static int virtnet_poll(struct napi_struct *napi, int budget)
|
||||
{
|
||||
struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi);
|
||||
struct sk_buff *skb = NULL;
|
||||
void *buf;
|
||||
unsigned int len, received = 0;
|
||||
|
||||
again:
|
||||
while (received < budget &&
|
||||
(skb = vi->rvq->vq_ops->get_buf(vi->rvq, &len)) != NULL) {
|
||||
__skb_unlink(skb, &vi->recv);
|
||||
receive_skb(vi->dev, skb, len);
|
||||
vi->num--;
|
||||
(buf = vi->rvq->vq_ops->get_buf(vi->rvq, &len)) != NULL) {
|
||||
receive_buf(vi->dev, buf, len);
|
||||
--vi->num;
|
||||
received++;
|
||||
}
|
||||
|
||||
|
|
@ -495,9 +555,9 @@ 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(sg, &hdr->mhdr, sizeof(hdr->mhdr));
|
||||
sg_set_buf(sg, &hdr->mhdr, sizeof hdr->mhdr);
|
||||
else
|
||||
sg_set_buf(sg, &hdr->hdr, sizeof(hdr->hdr));
|
||||
sg_set_buf(sg, &hdr->hdr, sizeof hdr->hdr);
|
||||
|
||||
hdr->num_sg = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1;
|
||||
return vi->svq->vq_ops->add_buf(vi->svq, sg, hdr->num_sg, 0, skb);
|
||||
|
|
@ -917,8 +977,7 @@ static int virtnet_probe(struct virtio_device *vdev)
|
|||
dev->features |= NETIF_F_HW_VLAN_FILTER;
|
||||
}
|
||||
|
||||
/* Initialize our empty receive and send queues. */
|
||||
skb_queue_head_init(&vi->recv);
|
||||
/* Initialize our empty send queue. */
|
||||
skb_queue_head_init(&vi->send);
|
||||
|
||||
err = register_netdev(dev);
|
||||
|
|
@ -953,25 +1012,35 @@ free:
|
|||
return err;
|
||||
}
|
||||
|
||||
static void free_unused_bufs(struct virtnet_info *vi)
|
||||
{
|
||||
void *buf;
|
||||
while (1) {
|
||||
buf = vi->rvq->vq_ops->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 __devexit virtnet_remove(struct virtio_device *vdev)
|
||||
{
|
||||
struct virtnet_info *vi = vdev->priv;
|
||||
struct sk_buff *skb;
|
||||
|
||||
/* Stop all the virtqueues. */
|
||||
vdev->config->reset(vdev);
|
||||
|
||||
/* Free our skbs in send and recv queues, if any. */
|
||||
while ((skb = __skb_dequeue(&vi->recv)) != NULL) {
|
||||
kfree_skb(skb);
|
||||
vi->num--;
|
||||
}
|
||||
/* Free our skbs in send queue, if any. */
|
||||
__skb_queue_purge(&vi->send);
|
||||
|
||||
BUG_ON(vi->num != 0);
|
||||
|
||||
unregister_netdev(vi->dev);
|
||||
cancel_delayed_work_sync(&vi->refill);
|
||||
free_unused_bufs(vi);
|
||||
|
||||
vdev->config->del_vqs(vi->vdev);
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue