linux-kernel - [PATCH 5.15 044/124] net: mscc: ocelot: fix broken IP multicast flooding

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Message-Id: <20220426081748.555271039@linuxfoundation.org>
Date:   Tue, 26 Apr 2022 10:20:45 +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, Vladimir Oltean <vladimir.oltean@....com>,
        Paolo Abeni <pabeni@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 044/124] net: mscc: ocelot: fix broken IP multicast flooding

From: Vladimir Oltean <vladimir.oltean@....com>

[ Upstream commit 4cf35a2b627a020fe1a6b6fc7a6a12394644e474 ]

When the user runs:
bridge link set dev $br_port mcast_flood on

this command should affect not only L2 multicast, but also IPv4 and IPv6
multicast.

In the Ocelot switch, unknown multicast gets flooded according to
different PGIDs according to its type, and PGID_MC only handles L2
multicast. Therefore, by leaving PGID_MCIPV4 and PGID_MCIPV6 at their
default value of 0, unknown IP multicast traffic is never flooded.

Fixes: 421741ea5672 ("net: mscc: ocelot: offload bridge port flags to device")
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
Link: https://lore.kernel.org/r/20220415151950.219660-1-vladimir.oltean@nxp.com
Signed-off-by: Paolo Abeni <pabeni@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/mscc/ocelot.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c
index 6aad0953e8fe..a59300d9e000 100644
--- a/drivers/net/ethernet/mscc/ocelot.c
+++ b/drivers/net/ethernet/mscc/ocelot.c
@@ -1932,6 +1932,8 @@ static void ocelot_port_set_mcast_flood(struct ocelot *ocelot, int port,
 		val = BIT(port);
 
 	ocelot_rmw_rix(ocelot, val, BIT(port), ANA_PGID_PGID, PGID_MC);
+	ocelot_rmw_rix(ocelot, val, BIT(port), ANA_PGID_PGID, PGID_MCIPV4);
+	ocelot_rmw_rix(ocelot, val, BIT(port), ANA_PGID_PGID, PGID_MCIPV6);
 }
 
 static void ocelot_port_set_bcast_flood(struct ocelot *ocelot, int port,
-- 
2.35.1