From: Ido Schimmel <idosch@mellanox.com>
Date: Tue, 26 May 2020 02:05:54 +0300
Subject: mlxsw: spectrum: Treat IPv6 link-local SIP as an exception
Patch-mainline: v5.8-rc1
Git-commit: dacc4e3acf542ce4c8a6dcc1a350decb443cf7f3
References: bsc#1176774

IPv6 packets that need to be forwarded and have a link-local source IP are
dropped by the kernel and an ICMPv6 "Destination unreachable" is sent to
the sending host.

As such, change the trap group of such packets so that they do not
interfere with IPv6 management packets. In the future this trap will be
exposed as an exception via devlink-trap.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
@@ -4067,7 +4067,7 @@ static const struct mlxsw_listener mlxsw
 	MLXSW_SP_RXL_MARK(IPV6_UNSPECIFIED_ADDRESS, TRAP_TO_CPU, ROUTER_EXP,
 			  false),
 	MLXSW_SP_RXL_MARK(IPV6_LINK_LOCAL_DEST, TRAP_TO_CPU, IP2ME, false),
-	MLXSW_SP_RXL_MARK(IPV6_LINK_LOCAL_SRC, TRAP_TO_CPU, IPV6, false),
+	MLXSW_SP_RXL_MARK(IPV6_LINK_LOCAL_SRC, TRAP_TO_CPU, ROUTER_EXP, false),
 	MLXSW_SP_RXL_MARK(IPV6_ALL_NODES_LINK, TRAP_TO_CPU, IPV6, false),
 	MLXSW_SP_RXL_MARK(IPV6_ALL_ROUTERS_LINK, TRAP_TO_CPU, IPV6,
 			  false),