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| author | Amit Shah <amit.shah@redhat.com> | 2009-08-26 11:28:28 +0200 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2009-09-24 02:29:21 +0200 |
| commit | 0aea51c37fc5868cd723f670af9056c2ef694fee (patch) | |
| tree | 9fee50abd200decd4b02350e4f1aed0cccc3a976 /drivers/net/virtio_net.c | |
| parent | virtio_net: avoid (most) NETDEV_TX_BUSY by stopping queue early. (diff) | |
| download | linux-0aea51c37fc5868cd723f670af9056c2ef694fee.tar.xz linux-0aea51c37fc5868cd723f670af9056c2ef694fee.zip | |
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)
Diffstat (limited to 'drivers/net/virtio_net.c')
| -rw-r--r-- | drivers/net/virtio_net.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index effe8c685f77..d445845f2779 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -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); |