| Message ID | 1422896842-19186-1-git-send-email-mst@redhat.com |
|---|---|
| State | Accepted, archived |
| Delegated to: | David Miller |
| Headers | show |
From: "Michael S. Tsirkin" <mst@redhat.com> Date: Tue, 3 Feb 2015 11:07:06 +0200 > 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> Applied. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Wed, Feb 04, 2015 at 01:59:42PM -0800, David Miller wrote: > From: "Michael S. Tsirkin" <mst@redhat.com> > Date: Tue, 3 Feb 2015 11:07:06 +0200 > > > 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> > > Applied. FWIW, conflict with iov_iter patches is trivial; once it shows up in your kernel.org tree I can either rebase the series or just push #merge-candidate - whichever you prefer. Linus usually prefers the second variant, but then he seriously dislikes rebasing of any sort; I've no idea what your preferences are in that area... -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c index d415d69..9484d56 100644 --- a/drivers/vhost/net.c +++ b/drivers/vhost/net.c @@ -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");
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> --- It seems important to get this into 3.19, otherwise VIRTIO_1 feature bit is unreliable. Dave, do you plan another pull request for 3.19? If yes pls merge this, if not pls let me know and I'll try to send it to Linus directly. drivers/vhost/net.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)