On 11/28/2013 12:31 AM, Michael S. Tsirkin wrote:
> receive mergeable now handles errors internally.
> Do same for big and small packet paths, otherwise
> the logic is too hard to follow.
>
> Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
> ---
>
> While I can't point at a bug this fixes, I'm not sure
> there's no bug in the existing logic.
> So not exactly a bug fix bug I think it's justified for net.
>
> drivers/net/virtio_net.c | 53 +++++++++++++++++++++++++++++++++---------------
> 1 file changed, 37 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 0e6ea69..97c6212 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -299,6 +299,35 @@ static struct sk_buff *page_to_skb(struct receive_queue *rq,
> return skb;
> }
>
> +static struct sk_buff *receive_small(void *buf, unsigned int len)
> +{
> + struct sk_buff * skb = buf;
> +
> + len -= sizeof(struct virtio_net_hdr);
> + skb_trim(skb, len);
> +
> + return skb;
> +}
> +
> +static struct sk_buff *receive_big(struct net_device *dev,
> + struct receive_queue *rq,
> + void *buf,
> + unsigned int len)
> +{
> + struct page *page = buf;
> + struct sk_buff *skb = page_to_skb(rq, page, 0, len, PAGE_SIZE);
> +
> + if (unlikely(!skb))
> + goto err;
> +
> + return skb;
> +
> +err:
> + dev->stats.rx_dropped++;
> + give_pages(rq, page);
> + return NULL;
> +}
> +
> static struct sk_buff *receive_mergeable(struct net_device *dev,
> struct receive_queue *rq,
> void *buf,
> @@ -407,23 +436,15 @@ static void receive_buf(struct receive_queue *rq, void *buf, unsigned int len)
> return;
> }
>
> - if (!vi->mergeable_rx_bufs && !vi->big_packets) {
> - skb = buf;
> - len -= sizeof(struct virtio_net_hdr);
> - skb_trim(skb, len);
> - } else if (vi->mergeable_rx_bufs) {
> + if (vi->mergeable_rx_bufs)
> skb = receive_mergeable(dev, rq, buf, len);
> - if (unlikely(!skb))
> - return;
> - } else {
> - page = buf;
> - skb = page_to_skb(rq, page, 0, len, PAGE_SIZE);
> - if (unlikely(!skb)) {
> - dev->stats.rx_dropped++;
> - give_pages(rq, page);
> - return;
> - }
> - }
> + else if (vi->big_packets)
> + skb = receive_big(dev, rq, buf, len);
> + else
> + skb = receive_small(buf, len);
> +
> + if (unlikely(!skb))
> + return;
>
> hdr = skb_vnet_hdr(skb);
>
Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
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