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vhost_net: revert upend_idx only on retriable error 

[ Upstream commit 1f5d2e3bab ]

Fix possible virtqueue used buffers leak and corresponding stuck
in case of temporary -EIO from sendmsg() which is produced by
tun driver while backend device is not up.

In case of no-retriable error and zcopy do not revert upend_idx
to pass packet data (that is update used_idx in corresponding
vhost_zerocopy_signal_used()) as if packet data has been
transferred successfully.

v2: set vq->heads[ubuf->desc].len equal to VHOST_DMA_DONE_LEN
in case of fake successful transmit.

Signed-off-by: Andrey Smetanin <asmetanin@yandex-team.ru>
Message-Id: <20230424204411.24888-1-asmetanin@yandex-team.ru>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Andrey Smetanin <asmetanin@yandex-team.ru>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Andrey Smetanin 2023-04-24 23:44:11 +03:00 committed by Greg Kroah-Hartman
parent 454e4f391a
commit 6ab9468d3e
1 changed files with 8 additions and 3 deletions
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11
drivers/vhost/net.c
View File

@ -934,13 +934,18 @@ static void handle_tx_zerocopy(struct vhost_net *net, struct socket *sock)
err = sock->ops->sendmsg(sock, &msg, len);
if (unlikely(err < 0)) {
bool retry = err == -EAGAIN || err == -ENOMEM || err == -ENOBUFS;
if (zcopy_used) {
if (vq->heads[ubuf->desc].len == VHOST_DMA_IN_PROGRESS)
vhost_net_ubuf_put(ubufs);
nvq->upend_idx = ((unsigned)nvq->upend_idx - 1)
% UIO_MAXIOV;
if (retry)
nvq->upend_idx = ((unsigned)nvq->upend_idx - 1)
% UIO_MAXIOV;
else
vq->heads[ubuf->desc].len = VHOST_DMA_DONE_LEN;
}
if (err == -EAGAIN || err == -ENOMEM || err == -ENOBUFS) {
if (retry) {
vhost_discard_vq_desc(vq, 1);
vhost_net_enable_vq(net, vq);
break;