linux-kernel - [RFC PATCH net-next 4/5] net: bridge: ensure FDB offloaded flag is handled as needed

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Message-Id: <20230117185714.3058453-5-netdev@kapio-technology.com>
Date:   Tue, 17 Jan 2023 19:57:13 +0100
From:   "Hans J. Schultz" <netdev@...io-technology.com>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     netdev@...r.kernel.org,
        "Hans J. Schultz" <netdev@...io-technology.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vladimir Oltean <olteanv@...il.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Woojung Huh <woojung.huh@...rochip.com>,
        UNGLinuxDriver@...rochip.com (maintainer:MICROCHIP KSZ SERIES ETHERNET
        SWITCH DRIVER), Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Clément Léger <clement.leger@...tlin.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Ivan Vecera <ivecera@...hat.com>,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <razor@...ckwall.org>,
        Russell King <linux@...linux.org.uk>,
        Christian Marangi <ansuelsmth@...il.com>,
        linux-kernel@...r.kernel.org (open list),
        linux-arm-kernel@...ts.infradead.org (moderated list:ARM/Mediatek SoC
        support),
        linux-mediatek@...ts.infradead.org (moderated list:ARM/Mediatek SoC
        support),
        linux-renesas-soc@...r.kernel.org (open list:RENESAS RZ/N1 A5PSW SWITCH
        DRIVER),
        bridge@...ts.linux-foundation.org (moderated list:ETHERNET BRIDGE)
Subject: [RFC PATCH net-next 4/5] net: bridge: ensure FDB offloaded flag is handled as needed

Since user added entries in the bridge FDB will get the BR_FDB_OFFLOADED
flag set, we do not want the bridge to age those entries and we want the
entries to be deleted in the bridge upon an SWITCHDEV_FDB_DEL_TO_BRIDGE
event.

Signed-off-by: Hans J. Schultz <netdev@...io-technology.com>
---
 net/bridge/br_fdb.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
index e69a872bfc1d..b0c23a72bc76 100644
--- a/net/bridge/br_fdb.c
+++ b/net/bridge/br_fdb.c
@@ -537,6 +537,7 @@ void br_fdb_cleanup(struct work_struct *work)
 		unsigned long this_timer = f->updated + delay;
 
 		if (test_bit(BR_FDB_STATIC, &f->flags) ||
+		    test_bit(BR_FDB_OFFLOADED, &f->flags) ||
 		    test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &f->flags)) {
 			if (test_bit(BR_FDB_NOTIFY, &f->flags)) {
 				if (time_after(this_timer, now))
@@ -1465,7 +1466,9 @@ int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
 	spin_lock_bh(&br->hash_lock);
 
 	fdb = br_fdb_find(br, addr, vid);
-	if (fdb && test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags))
+	if (fdb &&
+	    (test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags) ||
+	     test_bit(BR_FDB_OFFLOADED, &fdb->flags)))
 		fdb_delete(br, fdb, swdev_notify);
 	else
 		err = -ENOENT;
-- 
2.34.1