[ovs-dev] [PATCH] vxlan: Fix for the packet loop issue in vxlan

[Neelakantam Gaddam]

This patch fixes the kernel soft lockup issue with vxlan configuration
where the tunneled packet is sent on the same bridge where vxlan port is
attched to. It detects the loop in vxlan xmit functionb and drops if loop is
detected.

Signed-off-by: Neelakantam Gaddam <neelugaddam at gmail.com>
---
 datapath/linux/compat/vxlan.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/datapath/linux/compat/vxlan.c b/datapath/linux/compat/vxlan.c
index 287dad2..00562fa 100644
--- a/datapath/linux/compat/vxlan.c
+++ b/datapath/linux/compat/vxlan.c
@@ -1115,7 +1115,8 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
 			goto tx_error;
 		}
 
-		if (rt->dst.dev == dev) {
+		if ((rt->dst.dev == dev) ||
+			(OVS_CB(skb)->input_vport->dev == rt->dst.dev)) {
 			netdev_dbg(dev, "circular route to %pI4\n",
 				   &dst->sin.sin_addr.s_addr);
 			dev->stats.collisions++;
@@ -1174,7 +1175,8 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
 			goto tx_error;
 		}
 
-		if (ndst->dev == dev) {
+		if ((ndst->dev == dev) ||
+			(OVS_CB(skb)->input_vport->dev == ndst->dev)) {
 			netdev_dbg(dev, "circular route to %pI6\n",
 				   &dst->sin6.sin6_addr);
 			dst_release(ndst);
-- 
1.8.3.1