[dpdk-dev] [PATCH 1/2] vhost: fix Virtio-net header len with packed ring

[Maxime Coquelin <maxime.coquelin@redhat.com>]

In case packed ring layout has been negotiated, but neither
Version 1 nor mergeable buffers, the Virtio-net header len
is assigned to the legacy devices value, which is wrong.

This patch fixes this with using the proper len as devices
using packed ring are not legacy devices.

Fixes: a922401f35cc ("vhost: add Rx support for packed ring")
Fixes: ae999ce49dcb ("vhost: add Tx support for packed ring")
Cc: stable@dpdk.org

Reported-by: Marvin Liu <yong.liu@intel.com>
Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---
 lib/librte_vhost/vhost_user.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index 4deceb3e00..5d1fb9e863 100644
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -341,7 +341,9 @@ vhost_user_set_features(struct virtio_net **pdev, struct VhostUserMsg *msg,
 
 	dev->features = features;
 	if (dev->features &
-		((1 << VIRTIO_NET_F_MRG_RXBUF) | (1ULL << VIRTIO_F_VERSION_1))) {
+		((1ULL << VIRTIO_NET_F_MRG_RXBUF) |
+		 (1ULL << VIRTIO_F_VERSION_1) |
+		 (1ULL << VIRTIO_F_RING_PACKED))) {
 		dev->vhost_hlen = sizeof(struct virtio_net_hdr_mrg_rxbuf);
 	} else {
 		dev->vhost_hlen = sizeof(struct virtio_net_hdr);
-- 
2.26.2