[dpdk-stable] [PATCH] vhost: add protocol feature check

[Jin Yu <jin.yu@intel.com>]

Add VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD check in
getting inflight ring functions.

Fixes: 4d891f77ddfa ("vhost: add APIs to get inflight ring")
Cc: stable@dpdk.org

Signed-off-by: Jin Yu <jin.yu@intel.com>
---
 lib/librte_vhost/vhost.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/lib/librte_vhost/vhost.c b/lib/librte_vhost/vhost.c
index 1cbe948f7..dfb71732b 100644
--- a/lib/librte_vhost/vhost.c
+++ b/lib/librte_vhost/vhost.c
@@ -862,6 +862,10 @@ rte_vhost_get_vhost_ring_inflight(int vid, uint16_t vring_idx,
 	if (unlikely(!dev))
 		return -1;
 
+	if (unlikely(!(dev->protocol_features &
+	    (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
+		return 0;
+
 	if (vring_idx >= VHOST_MAX_VRING)
 		return -1;
 
@@ -1431,6 +1435,10 @@ rte_vhost_get_vring_base_from_inflight(int vid,
 	if (dev == NULL || last_avail_idx == NULL || last_used_idx == NULL)
 		return -1;
 
+	if (unlikely(!(dev->protocol_features &
+	    (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
+		return 0;
+
 	if (!vq_is_packed(dev))
 		return -1;
 
-- 
2.17.2