From: Maxime Coquelin <maxime.coquelin@redhat.com>
Date: Thu, 29 Jun 2017 07:58:10 +0000 (+0200)
Subject: vhost: fix MTU device feature check
X-Git-Tag: spdx-start~2709
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=02f62392ffcaf1617e0749fe3d6e0263c077ef79;p=dpdk.git

vhost: fix MTU device feature check

The MTU feature support check has to be done against MTU
feature bit mask, and not bit position.

Fixes: 72e8543093df ("vhost: add API to get MTU value")
Cc: stable@dpdk.org

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Reviewed-by: Jianfeng Tan <jianfeng.tan@intel.com>
Acked-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
---

diff --git a/lib/librte_vhost/vhost.c b/lib/librte_vhost/vhost.c
index 19c5a43a51..653152fc7d 100644
--- a/lib/librte_vhost/vhost.c
+++ b/lib/librte_vhost/vhost.c
@@ -272,7 +272,7 @@ rte_vhost_get_mtu(int vid, uint16_t *mtu)
 	if (!(dev->flags & VIRTIO_DEV_READY))
 		return -EAGAIN;
 
-	if (!(dev->features & VIRTIO_NET_F_MTU))
+	if (!(dev->features & (1ULL << VIRTIO_NET_F_MTU)))
 		return -ENOTSUP;
 
 	*mtu = dev->mtu;