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virtio_net: Check for room in the vq before adding buffer 

Saves us one cycle of alloc-add-free if the queue was full.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (modified)
This commit is contained in:
Amit Shah 2009-08-26 14:58:28 +05:30 committed by Rusty Russell
parent 48925e372f
commit 0aea51c37f
1 changed files with 4 additions and 4 deletions
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8
drivers/net/virtio_net.c
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@ -280,7 +280,7 @@ static bool try_fill_recv_maxbufs(struct virtnet_info *vi, gfp_t gfp)
bool oom = false;
sg_init_table(sg, 2+MAX_SKB_FRAGS);
for (;;) {
do {
struct skb_vnet_hdr *hdr;
skb = netdev_alloc_skb(vi->dev, MAX_PACKET_LEN + NET_IP_ALIGN);
@ -323,7 +323,7 @@ static bool try_fill_recv_maxbufs(struct virtnet_info *vi, gfp_t gfp)
break;
}
vi->num++;
}
} while (err >= num);
if (unlikely(vi->num > vi->max))
vi->max = vi->num;
vi->rvq->vq_ops->kick(vi->rvq);
@ -341,7 +341,7 @@ static bool try_fill_recv(struct virtnet_info *vi, gfp_t gfp)
if (!vi->mergeable_rx_bufs)
return try_fill_recv_maxbufs(vi, gfp);
for (;;) {
do {
skb_frag_t *f;
skb = netdev_alloc_skb(vi->dev, GOOD_COPY_LEN + NET_IP_ALIGN);
@ -375,7 +375,7 @@ static bool try_fill_recv(struct virtnet_info *vi, gfp_t gfp)
break;
}
vi->num++;
}
} while (err > 0);
if (unlikely(vi->num > vi->max))
vi->max = vi->num;
vi->rvq->vq_ops->kick(vi->rvq);