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authorJason Wang <jasowang@redhat.com>2015-02-15 16:35:17 +0800
committerDavid S. Miller <davem@davemloft.net>2015-02-15 08:17:15 -0800
commit0960b6417e9ed8e4b4aa3c54e257324a9352f40b (patch)
tree57ed67565cc5723eedfb15bc30894f29069177af /drivers/vhost
parentca9f1fd263e14765a4c213e46940876ad78fce28 (diff)
downloadlinux-0960b6417e9ed8e4b4aa3c54e257324a9352f40b.tar.bz2
vhost_net: fix wrong iter offset when setting number of buffers
In commit ba7438aed924 ("vhost: don't bother copying iovecs in handle_rx(), kill memcpy_toiovecend()"), we advance iov iter fixup sizeof(struct virtio_net_hdr) bytes and fill the number of buffers after doing the socket recvmsg(). This work well but was broken after commit 6e03f896b52c ("Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net") which tries to advance sizeof(struct virtio_net_hdr_mrg_rxbuf). It will fill the number of buffers at the wrong place. This patch fixes this. Fixes 6e03f896b52c ("Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net") Cc: David S. Miller <davem@davemloft.net> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Jason Wang <jasowang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/vhost')
-rw-r--r--drivers/vhost/net.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index 8dccca9013ed..afa06d28725d 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -528,9 +528,9 @@ static void handle_rx(struct vhost_net *net)
.msg_controllen = 0,
.msg_flags = MSG_DONTWAIT,
};
- struct virtio_net_hdr_mrg_rxbuf hdr = {
- .hdr.flags = 0,
- .hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE
+ struct virtio_net_hdr hdr = {
+ .flags = 0,
+ .gso_type = VIRTIO_NET_HDR_GSO_NONE
};
size_t total_len = 0;
int err, mergeable;
@@ -539,6 +539,7 @@ static void handle_rx(struct vhost_net *net)
size_t vhost_len, sock_len;
struct socket *sock;
struct iov_iter fixup;
+ __virtio16 num_buffers;
mutex_lock(&vq->mutex);
sock = vq->private_data;
@@ -616,9 +617,9 @@ static void handle_rx(struct vhost_net *net)
}
/* TODO: Should check and handle checksum. */
- hdr.num_buffers = cpu_to_vhost16(vq, headcount);
+ num_buffers = cpu_to_vhost16(vq, headcount);
if (likely(mergeable) &&
- copy_to_iter(&hdr.num_buffers, 2, &fixup) != 2) {
+ copy_to_iter(&num_buffers, 2, &fixup) != 2) {
vq_err(vq, "Failed num_buffers write");
vhost_discard_vq_desc(vq, headcount);
break;