netdev - [PATCH net-next v5 1/5] net: bridge: Set BR_FDB_ADDED_BY_USER early in fdb_add

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Message-Id: <20231016-fdb_limit-v5-1-32cddff87758@avm.de>
Date: Mon, 16 Oct 2023 15:27:20 +0200
From: Johannes Nixdorf <jnixdorf-oss@....de>
To: "David S. Miller" <davem@...emloft.net>, Andrew Lunn <andrew@...n.ch>, 
 David Ahern <dsahern@...il.com>, Eric Dumazet <edumazet@...gle.com>, 
 Florian Fainelli <f.fainelli@...il.com>, Ido Schimmel <idosch@...dia.com>, 
 Jakub Kicinski <kuba@...nel.org>, Nikolay Aleksandrov <razor@...ckwall.org>, 
 Oleksij Rempel <linux@...pel-privat.de>, Paolo Abeni <pabeni@...hat.com>, 
 Roopa Prabhu <roopa@...dia.com>, Shuah Khan <shuah@...nel.org>, 
 Vladimir Oltean <vladimir.oltean@....com>
Cc: bridge@...ts.linux-foundation.org, netdev@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, 
 Johannes Nixdorf <jnixdorf-oss@....de>
Subject: [PATCH net-next v5 1/5] net: bridge: Set BR_FDB_ADDED_BY_USER
 early in fdb_add_entry

In preparation of the following fdb limit for dynamically learned entries,
allow fdb_create to detect that the entry was added by the user. This
way it can skip applying the limit in this case.

Reviewed-by: Ido Schimmel <idosch@...dia.com>
Acked-by: Nikolay Aleksandrov <razor@...ckwall.org>
Signed-off-by: Johannes Nixdorf <jnixdorf-oss@....de>
---
 net/bridge/br_fdb.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
index e69a872bfc1d..f517ea92132c 100644
--- a/net/bridge/br_fdb.c
+++ b/net/bridge/br_fdb.c
@@ -1056,7 +1056,8 @@ static int fdb_add_entry(struct net_bridge *br, struct net_bridge_port *source,
 		if (!(flags & NLM_F_CREATE))
 			return -ENOENT;

-		fdb = fdb_create(br, source, addr, vid, 0);
+		fdb = fdb_create(br, source, addr, vid,
+				 BIT(BR_FDB_ADDED_BY_USER));
 		if (!fdb)
 			return -ENOMEM;

@@ -1069,6 +1070,8 @@ static int fdb_add_entry(struct net_bridge *br, struct net_bridge_port *source,
 			WRITE_ONCE(fdb->dst, source);
 			modified = true;
 		}
+
+		set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags);
 	}

 	if (fdb_to_nud(br, fdb) != state) {
@@ -1100,8 +1103,6 @@ static int fdb_add_entry(struct net_bridge *br, struct net_bridge_port *source,
 	if (fdb_handle_notify(fdb, notify))
 		modified = true;

-	set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags);
-
 	fdb->used = jiffies;
 	if (modified) {
 		if (refresh)

-- 
2.42.0