diff options
author | Michael S. Tsirkin <mst@redhat.com> | 2013-12-26 13:32:51 (GMT) |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-01-15 23:31:37 (GMT) |
commit | aa016e2d4009621c8d48fecb20ef46a005c75aa8 (patch) | |
tree | 2c4c639740ec1e4b7d7d39abdc72f6ef26ddb328 /drivers/net | |
parent | 20d93869b19d03748b3f86d169ad830e2fbb7923 (diff) | |
download | linux-fsl-qoriq-aa016e2d4009621c8d48fecb20ef46a005c75aa8.tar.xz |
virtio-net: make all RX paths handle errors consistently
receive mergeable now handles errors internally.
Do same for big and small packet paths, otherwise
the logic is too hard to follow.
Cc: Jason Wang <jasowang@redhat.com>
Cc: David S. Miller <davem@davemloft.net>
Acked-by: Michael Dalton <mwdalton@google.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
(cherry picked from commit f121159d72091f25afb22007c833e60a6845e912)
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/net')
-rw-r--r-- | drivers/net/virtio_net.c | 56 |
1 files changed, 36 insertions, 20 deletions
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 52d8936..21f2b4a 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -297,6 +297,34 @@ 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) +{ + struct page *page = buf; + struct sk_buff *skb = page_to_skb(rq, page, 0); + + 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, @@ -360,7 +388,6 @@ static void receive_buf(struct receive_queue *rq, void *buf, unsigned int len) struct net_device *dev = vi->dev; struct virtnet_stats *stats = this_cpu_ptr(vi->stats); struct sk_buff *skb; - struct page *page; struct skb_vnet_hdr *hdr; if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) { @@ -372,26 +399,15 @@ static void receive_buf(struct receive_queue *rq, void *buf, unsigned int len) dev_kfree_skb(buf); return; } + if (vi->mergeable_rx_bufs) + skb = receive_mergeable(dev, rq, buf, len); + else if (vi->big_packets) + skb = receive_big(dev, rq, buf); + else + skb = receive_small(buf, len); - if (!vi->mergeable_rx_bufs && !vi->big_packets) { - skb = buf; - len -= sizeof(struct virtio_net_hdr); - skb_trim(skb, len); - } else { - page = buf; - if (vi->mergeable_rx_bufs) { - skb = receive_mergeable(dev, rq, page, len); - if (unlikely(!skb)) - return; - } else { - skb = page_to_skb(rq, page, len); - if (unlikely(!skb)) { - dev->stats.rx_dropped++; - give_pages(rq, page); - return; - } - } - } + if (unlikely(!skb)) + return; hdr = skb_vnet_hdr(skb); |