mlxsw: spectrum: Forward packets with an IPv4 link-local source IP

[ Upstream commit f604d3aaf64ff0d90cc875295474d3abf4155629 ]

By default, the device does not forward IPv4 packets with a link-local
source IP (i.e., 169.254.0.0/16). This behavior does not align with the
kernel which does forward them.

Fix by instructing the device to forward such packets instead of
dropping them.

Fixes: ca360db4b825 ("mlxsw: spectrum: Disable DIP_LINK_LOCAL check in hardware pipeline")
Reported-by: Zoey Mertes <zoey@cloudflare.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Link: https://patch.msgid.link/6721e6b2c96feb80269e72ce8d0b426e2f32d99c.1755174341.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
index 3f5e5d99251b75312e2d74a4da16704fc34de366..26401bb57572db37bd429474ce50b94291caa645 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
@@ -2507,6 +2507,8 @@ static const struct mlxsw_listener mlxsw_sp_listener[] = {
                             ROUTER_EXP, false),
        MLXSW_SP_RXL_NO_MARK(DISCARD_ING_ROUTER_DIP_LINK_LOCAL, FORWARD,
                             ROUTER_EXP, false),
+       MLXSW_SP_RXL_NO_MARK(DISCARD_ING_ROUTER_SIP_LINK_LOCAL, FORWARD,
+                            ROUTER_EXP, false),
        /* Multicast Router Traps */
        MLXSW_SP_RXL_MARK(ACL1, TRAP_TO_CPU, MULTICAST, false),
        MLXSW_SP_RXL_L3_MARK(ACL2, TRAP_TO_CPU, MULTICAST, false),

diff --git a/drivers/net/ethernet/mellanox/mlxsw/trap.h b/drivers/net/ethernet/mellanox/mlxsw/trap.h
index 83477c8e6971b8ed9a645bd68e6ef6e01dff881e..5bfc1499347a93fbe5040c3f1cad247a205aa001 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlxsw/trap.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/trap.h
@@ -95,6 +95,7 @@ enum {
        MLXSW_TRAP_ID_DISCARD_ING_ROUTER_IPV4_SIP_BC = 0x16A,
        MLXSW_TRAP_ID_DISCARD_ING_ROUTER_IPV4_DIP_LOCAL_NET = 0x16B,
        MLXSW_TRAP_ID_DISCARD_ING_ROUTER_DIP_LINK_LOCAL = 0x16C,
+       MLXSW_TRAP_ID_DISCARD_ING_ROUTER_SIP_LINK_LOCAL = 0x16D,
        MLXSW_TRAP_ID_DISCARD_ROUTER_IRIF_EN = 0x178,
        MLXSW_TRAP_ID_DISCARD_ROUTER_ERIF_EN = 0x179,
        MLXSW_TRAP_ID_DISCARD_ROUTER_LPM4 = 0x17B,