linux-kernel - [PATCH 4.16 41/55] mlxsw: spectrum_switchdev: Do not remove mrouter port from MDBs ports list

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Message-Id: <20180518081459.389605908@linuxfoundation.org>
Date:   Fri, 18 May 2018 10:15:37 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ido Schimmel <idosch@...lanox.com>,
        Colin King <colin.king@...onical.com>,
        Nogah Frankel <nogahf@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.16 41/55] mlxsw: spectrum_switchdev: Do not remove mrouter port from MDBs ports list

4.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ido Schimmel <idosch@...lanox.com>

[ Upstream commit c7f46cca8c73a44311e4164b9196b4d791f59ac7 ]

When IGMP snooping is enabled on a bridge, traffic forwarded by an MDB
entry should be sent to both ports member in the MDB's ports list and
mrouter ports.

In case a port needs to be removed from an MDB's ports list, but this
port is also configured as an mrouter port, then do not update the
device so that it will continue to forward traffic through that port.

Fix a copy-paste error that checked that IGMP snooping is enabled twice
instead of checking the port's mrouter state.

Fixes: ded711c87a04 ("mlxsw: spectrum_switchdev: Consider mrouter status for mdb changes")
Signed-off-by: Ido Schimmel <idosch@...lanox.com>
Reported-by: Colin King <colin.king@...onical.com>
Reviewed-by: Nogah Frankel <nogahf@...lanox.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c |   12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
@@ -1718,13 +1718,11 @@ __mlxsw_sp_port_mdb_del(struct mlxsw_sp_
 	struct net_device *dev = mlxsw_sp_port->dev;
 	int err;
 
-	if (bridge_port->bridge_device->multicast_enabled) {
-		if (bridge_port->bridge_device->multicast_enabled) {
-			err = mlxsw_sp_port_smid_set(mlxsw_sp_port, mid->mid,
-						     false);
-			if (err)
-				netdev_err(dev, "Unable to remove port from SMID\n");
-		}
+	if (bridge_port->bridge_device->multicast_enabled &&
+	    !bridge_port->mrouter) {
+		err = mlxsw_sp_port_smid_set(mlxsw_sp_port, mid->mid, false);
+		if (err)
+			netdev_err(dev, "Unable to remove port from SMID\n");
 	}
 
 	err = mlxsw_sp_port_remove_from_mid(mlxsw_sp_port, mid);