[ovs-dev] [PATCH] dpif-netdev: Fail port addition if reconfiguration failed.

[Ilya Maximets]

If the port was destroyed during the initial reconfiguration, we should
report an error to the upper layers. Otherwise, successful addition of
the port will be logged and upper layers will continue to configure
this port. For example, the 'dpif' layer will try to initilaize flow
API for this device.

Fix that by checking for port existence after reconfiguration. We can't
get the real error code here, so let's assume EINVAL. 'ovs-vsctl' will
tell the user to check the logs for a real reason anyway.

Fixes: e32971b8ddb4 ("dpif-netdev: Centralized threads and queues handling code.")
Signed-off-by: Ilya Maximets <i.maximets at samsung.com>
---
 lib/dpif-netdev.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/dpif-netdev.c b/lib/dpif-netdev.c
index d0a1c58ad..75d85b2fd 100644
--- a/lib/dpif-netdev.c
+++ b/lib/dpif-netdev.c
@@ -1862,7 +1862,8 @@ do_add_port(struct dp_netdev *dp, const char *devname, const char *type,
 
     reconfigure_datapath(dp);
 
-    return 0;
+    /* Check that port was successfully configured. */
+    return dp_netdev_lookup_port(dp, port_no) ? 0 : EINVAL;
 }
 
 static int
-- 
2.17.1