netdev - [PATCH net-next 1/2] net: bridge: allow SW learn to take over HW fdb entries

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Message-Id: <1490264833-28867-2-git-send-email-nikolay@cumulusnetworks.com>
Date:   Thu, 23 Mar 2017 12:27:12 +0200
From:   Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:     netdev@...r.kernel.org
Cc:     idosch@...lanox.com, jiri@...nulli.us, stephen@...workplumber.org,
        bridge@...ts.linux-foundation.org, roopa@...ulusnetworks.com,
        davem@...emloft.net,
        Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
Subject: [PATCH net-next 1/2] net: bridge: allow SW learn to take over HW fdb entries

Allow to take over an entry which was previously learned via HW when it
shows up from a SW port. This is analogous to how HW takes over SW learned
entries already.

Suggested-by: Roopa Prabhu <roopa@...ulusnetworks.com>
Signed-off-by: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
---
 net/bridge/br_fdb.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
index 4f598dc2d916..e4c8adf517ea 100644
--- a/net/bridge/br_fdb.c
+++ b/net/bridge/br_fdb.c
@@ -594,6 +594,9 @@ void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 				fdb->updated = now;
 			if (unlikely(added_by_user))
 				fdb->added_by_user = 1;
+			/* Take over HW learned entry */
+			if (unlikely(fdb->added_by_external_learn))
+				fdb->added_by_external_learn = 0;
 			if (unlikely(fdb_modified))
 				fdb_notify(br, fdb, RTM_NEWNEIGH);
 		}
-- 
2.1.4