diff options
| author | Michael S. Tsirkin <mst@redhat.com> | 2015-02-25 15:19:28 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-02-27 21:53:44 +0100 |
| commit | 4c5a84421c7d1c259c3883a404f9a67a2f55b003 (patch) | |
| tree | 03a323eceb7203dcf739317e5bb2a3e34cf52e7c | |
| parent | rocker: silence shift wrapping warning (diff) | |
| download | linux-4c5a84421c7d1c259c3883a404f9a67a2f55b003.tar.xz linux-4c5a84421c7d1c259c3883a404f9a67a2f55b003.zip | |
vhost: cleanup iterator update logic
Recent iterator-related changes in vhost made it
harder to follow the logic fixing up the header.
In fact, the fixup always happens at the same
offset: sizeof(virtio_net_hdr): sometimes the
fixup iterator is updated by copy_to_iter,
sometimes-by iov_iter_advance.
Rearrange code to make this obvious.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/vhost/net.c | 22 |
1 files changed, 12 insertions, 10 deletions
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c index afa06d28725d..ca7043459e2c 100644 --- a/drivers/vhost/net.c +++ b/drivers/vhost/net.c @@ -591,11 +591,6 @@ static void handle_rx(struct vhost_net *net) * TODO: support TSO. */ iov_iter_advance(&msg.msg_iter, vhost_hlen); - } else { - /* It'll come from socket; we'll need to patch - * ->num_buffers over if VIRTIO_NET_F_MRG_RXBUF - */ - iov_iter_advance(&fixup, sizeof(hdr)); } err = sock->ops->recvmsg(NULL, sock, &msg, sock_len, MSG_DONTWAIT | MSG_TRUNC); @@ -609,11 +604,18 @@ static void handle_rx(struct vhost_net *net) continue; } /* Supply virtio_net_hdr if VHOST_NET_F_VIRTIO_NET_HDR */ - if (unlikely(vhost_hlen) && - copy_to_iter(&hdr, sizeof(hdr), &fixup) != sizeof(hdr)) { - vq_err(vq, "Unable to write vnet_hdr at addr %p\n", - vq->iov->iov_base); - break; + if (unlikely(vhost_hlen)) { + if (copy_to_iter(&hdr, sizeof(hdr), + &fixup) != sizeof(hdr)) { + vq_err(vq, "Unable to write vnet_hdr " + "at addr %p\n", vq->iov->iov_base); + break; + } + } else { + /* Header came from socket; we'll need to patch + * ->num_buffers over if VIRTIO_NET_F_MRG_RXBUF + */ + iov_iter_advance(&fixup, sizeof(hdr)); } /* TODO: Should check and handle checksum. */ |