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vhost-net: check the support of mergeable buffer outside the receive loop 

No need to check the support of mergeable buffer inside the recevie
loop as the whole handle_rx()_xx is in the read critical region.  So
this patch move it ahead of the receiving loop.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jason Wang 2011-01-17 16:10:59 +08:00 committed by Michael S. Tsirkin
parent fcc042a280
commit cfbdab9513
1 changed files with 3 additions and 2 deletions
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5
drivers/vhost/net.c
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@ -411,7 +411,7 @@ static void handle_rx_mergeable(struct vhost_net *net)
.hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE
};
size_t total_len = 0;
int err, headcount;
int err, headcount, mergeable;
size_t vhost_hlen, sock_hlen;
size_t vhost_len, sock_len;
/* TODO: check that we are running from vhost_worker? */
@ -427,6 +427,7 @@ static void handle_rx_mergeable(struct vhost_net *net)
vq_log = unlikely(vhost_has_feature(&net->dev, VHOST_F_LOG_ALL)) ?
vq->log : NULL;
mergeable = vhost_has_feature(&net->dev, VIRTIO_NET_F_MRG_RXBUF);
while ((sock_len = peek_head_len(sock->sk))) {
sock_len += sock_hlen;
@ -476,7 +477,7 @@ static void handle_rx_mergeable(struct vhost_net *net)
break;
}
/* TODO: Should check and handle checksum. */
if (vhost_has_feature(&net->dev, VIRTIO_NET_F_MRG_RXBUF) &&
if (likely(mergeable) &&
memcpy_toiovecend(vq->hdr, (unsigned char *)&headcount,
offsetof(typeof(hdr), num_buffers),
sizeof hdr.num_buffers)) {