net/virtio-user: fix used ring in cvq handling

When updating used ring, the id in used element should be the
index of the first desc in the desc chain.

Fixes: f9b9d1a55775 ("net/virtio-user: add multiple queues in device emulation")
Cc: stable@dpdk.org
Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.c b/drivers/net/virtio/virtio_user/virtio_user_dev.c
index 89d287a740c0cd737936672c70d4bdb98b3ef8f8..d1157378d4e69cdbab1f14686fc8d401154a30c6 100644 (file)
--- a/drivers/net/virtio/virtio_user/virtio_user_dev.c
+++ b/drivers/net/virtio/virtio_user/virtio_user_dev.c
@@ -722,7 +722,7 @@ virtio_user_handle_cq(struct virtio_user_dev *dev, uint16_t queue_idx)
 
                /* Update used ring */
                uep = &vring->used->ring[avail_idx];
-               uep->id = avail_idx;
+               uep->id = desc_idx;
                uep->len = n_descs;
 
                vring->used->idx++;