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authorAl Viro <viro@zeniv.linux.org.uk>2014-12-10 15:00:58 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2015-02-04 01:34:16 -0500
commit98a527aac1eb198dbc4405b800e102563ed8e4dd (patch)
tree9bb6a91ca35a969344314cb0e4b5173d18e5581a /drivers/vhost
parentaad9a1cec7dcd1d45809b64643fce37061b17788 (diff)
vhost: don't bother with copying iovec in handle_tx()
just advance the msg.msg_iter and be done with that. Cc: Michael S. Tsirkin <mst@redhat.com> Cc: kvm@vger.kernel.org Cc: virtualization@lists.linux-foundation.org Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'drivers/vhost')
-rw-r--r--drivers/vhost/net.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index 6906f76332f4..d86cc9bb9ea4 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -336,7 +336,7 @@ static void handle_tx(struct vhost_net *net)
{
struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX];
struct vhost_virtqueue *vq = &nvq->vq;
- unsigned out, in, s;
+ unsigned out, in;
int head;
struct msghdr msg = {
.msg_name = NULL,
@@ -395,16 +395,17 @@ static void handle_tx(struct vhost_net *net)
break;
}
/* Skip header. TODO: support TSO. */
- s = move_iovec_hdr(vq->iov, nvq->hdr, hdr_size, out);
len = iov_length(vq->iov, out);
iov_iter_init(&msg.msg_iter, WRITE, vq->iov, out, len);
+ iov_iter_advance(&msg.msg_iter, hdr_size);
/* Sanity check */
- if (!len) {
+ if (!iov_iter_count(&msg.msg_iter)) {
vq_err(vq, "Unexpected header len for TX: "
"%zd expected %zd\n",
- iov_length(nvq->hdr, s), hdr_size);
+ len, hdr_size);
break;
}
+ len = iov_iter_count(&msg.msg_iter);
zcopy_used = zcopy && len >= VHOST_GOODCOPY_LEN
&& (nvq->upend_idx + 1) % UIO_MAXIOV !=