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From:   Johannes Nixdorf <jnixdorf-oss@avm.de>
Date:   Mon, 16 Oct 2023 15:27:20 +0200
Subject: [PATCH net-next v5 1/5] net: bridge: Set BR_FDB_ADDED_BY_USER
 early in fdb_add_entry
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Message-Id: <20231016-fdb_limit-v5-1-32cddff87758@avm.de>
References: <20231016-fdb_limit-v5-0-32cddff87758@avm.de>
In-Reply-To: <20231016-fdb_limit-v5-0-32cddff87758@avm.de>
To:     "David S. Miller" <davem@davemloft.net>,
        Andrew Lunn <andrew@lunn.ch>, David Ahern <dsahern@gmail.com>,
        Eric Dumazet <edumazet@google.com>,
        Florian Fainelli <f.fainelli@gmail.com>,
        Ido Schimmel <idosch@nvidia.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Nikolay Aleksandrov <razor@blackwall.org>,
        Oleksij Rempel <linux@rempel-privat.de>,
        Paolo Abeni <pabeni@redhat.com>,
        Roopa Prabhu <roopa@nvidia.com>, Shuah Khan <shuah@kernel.org>,
        Vladimir Oltean <vladimir.oltean@nxp.com>
Cc:     bridge@lists.linux-foundation.org, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
        Johannes Nixdorf <jnixdorf-oss@avm.de>
Precedence: bulk

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@nvidia.com>
Acked-by: Nikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: Johannes Nixdorf <jnixdorf-oss@avm.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