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vhost/net: fix up num_buffers endian-ness 

In virtio 1.0 mode, when mergeable buffers are enabled on a big-endian
host, num_buffers wasn't byte-swapped correctly, so large incoming
packets got corrupted.

To fix, fill it in within hdr - this also makes sure it gets
the correct type.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michael S. Tsirkin 2015-02-03 11:07:06 +02:00 committed by David S. Miller
parent 75300ad2d9
commit 5201aa49b0
1 changed files with 3 additions and 1 deletions
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4
drivers/vhost/net.c
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@ -650,8 +650,10 @@ static void handle_rx(struct vhost_net *net)
break;
}
/* TODO: Should check and handle checksum. */
hdr.num_buffers = cpu_to_vhost16(vq, headcount);
if (likely(mergeable) &&
memcpy_toiovecend(nvq->hdr, (unsigned char *)&headcount,
memcpy_toiovecend(nvq->hdr, (void *)&hdr.num_buffers,
offsetof(typeof(hdr), num_buffers),
sizeof hdr.num_buffers)) {
vq_err(vq, "Failed num_buffers write");