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[5.12.16.165]) by smtp.gmail.com with ESMTPSA id bx24sm2801131ejc.88.2021.03.18.16.18.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 18 Mar 2021 16:18:44 -0700 (PDT) From: Vladimir Oltean To: Jakub Kicinski , "David S. Miller" Cc: Andrew Lunn , Vivien Didelot , Florian Fainelli , Tobias Waldekranz , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Roopa Prabhu , Nikolay Aleksandrov , Jiri Pirko , Ido Schimmel , Alexandre Belloni , UNGLinuxDriver@microchip.com, Vadym Kochan , Taras Chornyi , Grygorii Strashko , Vignesh Raghavendra , Ioana Ciornei , Ivan Vecera , linux-omap@vger.kernel.org, Vladimir Oltean Subject: [RFC PATCH v2 net-next 01/16] net: dsa: call dsa_port_bridge_join when joining a LAG that is already in a bridge Date: Fri, 19 Mar 2021 01:18:14 +0200 Message-Id: <20210318231829.3892920-2-olteanv@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210318231829.3892920-1-olteanv@gmail.com> References: <20210318231829.3892920-1-olteanv@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org From: Vladimir Oltean DSA can properly detect and offload this sequence of operations: ip link add br0 type bridge ip link add bond0 type bond ip link set swp0 master bond0 ip link set bond0 master br0 But not this one: ip link add br0 type bridge ip link add bond0 type bond ip link set bond0 master br0 ip link set swp0 master bond0 Actually the second one is more complicated, due to the elapsed time between the enslavement of bond0 and the offloading of it via swp0, a lot of things could have happened to the bond0 bridge port in terms of switchdev objects (host MDBs, VLANs, altered STP state etc). So this is a bit of a can of worms, and making sure that the DSA port's state is in sync with this already existing bridge port is handled in the next patches. Signed-off-by: Vladimir Oltean --- net/dsa/port.c | 22 ++++++++++++++++++---- 1 file changed, 18 insertions(+), 4 deletions(-) diff --git a/net/dsa/port.c b/net/dsa/port.c index c9c6d7ab3f47..d39262a9fe0e 100644 --- a/net/dsa/port.c +++ b/net/dsa/port.c @@ -249,17 +249,31 @@ int dsa_port_lag_join(struct dsa_port *dp, struct net_device *lag, .lag = lag, .info = uinfo, }; + struct net_device *bridge_dev; int err; dsa_lag_map(dp->ds->dst, lag); dp->lag_dev = lag; err = dsa_port_notify(dp, DSA_NOTIFIER_LAG_JOIN, &info); - if (err) { - dp->lag_dev = NULL; - dsa_lag_unmap(dp->ds->dst, lag); - } + if (err) + goto err_lag_join; + bridge_dev = netdev_master_upper_dev_get(lag); + if (!bridge_dev || !netif_is_bridge_master(bridge_dev)) + return 0; + + err = dsa_port_bridge_join(dp, bridge_dev); + if (err) + goto err_bridge_join; + + return 0; + +err_bridge_join: + dsa_port_notify(dp, DSA_NOTIFIER_LAG_LEAVE, &info); +err_lag_join: + dp->lag_dev = NULL; + dsa_lag_unmap(dp->ds->dst, lag); return err; } -- 2.25.1