netdev - [PATCH net-next 07/13] vxlan: changelink: Delete remote after update

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Date:   Wed, 16 Jan 2019 23:06:43 +0000
From:   Petr Machata <petrm@...lanox.com>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     "ivecera@...hat.com" <ivecera@...hat.com>,
        Jiri Pirko <jiri@...lanox.com>,
        Ido Schimmel <idosch@...lanox.com>,
        "davem@...emloft.net" <davem@...emloft.net>
Subject: [PATCH net-next 07/13] vxlan: changelink: Delete remote after update

If a change in remote address prompts a change in a default FDB entry,
that change might be vetoed. If that happens, it would then be necessary
to reinstate the already-removed default FDB entry corresponding to the
previous remote address.

Instead, arrange to have the previous address removed only after the
FDB is successfully vetted.

Signed-off-by: Petr Machata <petrm@...lanox.com>
---
 drivers/net/vxlan.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 51e10f47d4f1..83f65eb3085f 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -3809,15 +3809,6 @@ static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
 	/* handle default dst entry */
 	if (!vxlan_addr_equal(&conf.remote_ip, &dst->remote_ip)) {
 		spin_lock_bh(&vxlan->hash_lock);
-		if (!vxlan_addr_any(&dst->remote_ip))
-			__vxlan_fdb_delete(vxlan, all_zeros_mac,
-					   dst->remote_ip,
-					   vxlan->cfg.dst_port,
-					   dst->remote_vni,
-					   dst->remote_vni,
-					   dst->remote_ifindex,
-					   true);
-
 		if (!vxlan_addr_any(&conf.remote_ip)) {
 			err = vxlan_fdb_update(vxlan, all_zeros_mac,
 					       &conf.remote_ip,
@@ -3832,6 +3823,14 @@ static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
 				return err;
 			}
 		}
+		if (!vxlan_addr_any(&dst->remote_ip))
+			__vxlan_fdb_delete(vxlan, all_zeros_mac,
+					   dst->remote_ip,
+					   vxlan->cfg.dst_port,
+					   dst->remote_vni,
+					   dst->remote_vni,
+					   dst->remote_ifindex,
+					   true);
 		spin_unlock_bh(&vxlan->hash_lock);
 	}
 
-- 
2.4.11