[ovs-dev] [PATCH] dpif-netlink: Don't destroy and recreate port if it exists

Jianbo Liu jianbol at mellanox.com
Mon Oct 29 08:29:41 UTC 2018

In commit 7521e0cf9e ('ofproto-dpif: Let the dpif report when a port is
a duplicate'), the checking of port existence before adding was removed,
and it's up to the dpif to check if port exists and add only if needed.

But the port can't be added to datapath if already exists. Then it will
be destroyed and created again. This causes problem because configuration
may miss. For example, if creating two vxlan on the same port, its ingress
qdisc will be lost after recreated.

Signed-off-by: Jianbo Liu <jianbol at mellanox.com>
Reviewed-by: Roi Dayan <roid at mellanox.com>
 lib/dpif-netlink.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/dpif-netlink.c b/lib/dpif-netlink.c
index 2b2bb01..f2011f2 100644
--- a/lib/dpif-netlink.c
+++ b/lib/dpif-netlink.c
@@ -863,7 +863,7 @@ dpif_netlink_rtnl_port_create_and_add(struct dpif_netlink *dpif,
     name = netdev_vport_get_dpif_port(netdev, namebuf, sizeof namebuf);
     error = dpif_netlink_port_add__(dpif, name, OVS_VPORT_TYPE_NETDEV, NULL,
-    if (error) {
+    if (error && error != EEXIST) {
         dpif_netlink_rtnl_port_destroy(name, netdev_get_type(netdev));
     return error;
@@ -880,7 +880,7 @@ dpif_netlink_port_add(struct dpif *dpif_, struct netdev *netdev,
     if (!ovs_tunnels_out_of_tree) {
         error = dpif_netlink_rtnl_port_create_and_add(dpif, netdev, port_nop);
-    if (error) {
+    if (error && error != EEXIST) {
         error = dpif_netlink_port_add_compat(dpif, netdev, port_nop);

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