diff options
| author | Al Viro <viro@zeniv.linux.org.uk> | 2014-12-10 15:00:58 -0500 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2015-02-04 01:34:16 -0500 |
| commit | 98a527aac1eb198dbc4405b800e102563ed8e4dd (patch) | |
| tree | 9bb6a91ca35a969344314cb0e4b5173d18e5581a | |
| parent | aad9a1cec7dcd1d45809b64643fce37061b17788 (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>
| -rw-r--r-- | drivers/vhost/net.c | 9 |
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 != |