mlxsw: Add NON_ROUTABLE trap

Add a trap for packets that the device decided to drop because they are
not supposed to be routed. For example, IGMP queries can be flooded by
the device in layer 2 and reach the router. Such packets should not be
routed and instead dropped.
Signed-off-by: Amit Cohen <amitc@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/spectrum_trap.c

@@ -80,6 +80,7 @@ static struct devlink_trap mlxsw_sp_traps_arr[] = {
 	MLXSW_SP_TRAP_EXCEPTION(IPV6_LPM_UNICAST_MISS, L3_DROPS),
 	MLXSW_SP_TRAP_DRIVER_DROP(IRIF_DISABLED, L3_DROPS),
 	MLXSW_SP_TRAP_DRIVER_DROP(ERIF_DISABLED, L3_DROPS),
+	MLXSW_SP_TRAP_DROP(NON_ROUTABLE, L3_DROPS),
 };
 
 static struct mlxsw_listener mlxsw_sp_listeners_arr[] = {
@@ -114,6 +115,7 @@ static struct mlxsw_listener mlxsw_sp_listeners_arr[] = {
 			       TRAP_EXCEPTION_TO_CPU),
 	MLXSW_SP_RXL_DISCARD(ROUTER_IRIF_EN, L3_DISCARDS),
 	MLXSW_SP_RXL_DISCARD(ROUTER_ERIF_EN, L3_DISCARDS),
+	MLXSW_SP_RXL_DISCARD(NON_ROUTABLE, L3_DISCARDS),
 };
 
 /* Mapping between hardware trap and devlink trap. Multiple hardware traps can
@@ -149,6 +151,7 @@ static u16 mlxsw_sp_listener_devlink_map[] = {
 	DEVLINK_TRAP_GENERIC_ID_IPV6_LPM_UNICAST_MISS,
 	DEVLINK_MLXSW_TRAP_ID_IRIF_DISABLED,
 	DEVLINK_MLXSW_TRAP_ID_ERIF_DISABLED,
+	DEVLINK_TRAP_GENERIC_ID_NON_ROUTABLE,
 };
 
 static int mlxsw_sp_rx_listener(struct mlxsw_sp *mlxsw_sp, struct sk_buff *skb,

drivers/net/ethernet/mellanox/mlxsw/trap.h

@@ -67,6 +67,7 @@ enum {
 	MLXSW_TRAP_ID_NVE_ENCAP_ARP = 0xBD,
 	MLXSW_TRAP_ID_ROUTER_ALERT_IPV4 = 0xD6,
 	MLXSW_TRAP_ID_ROUTER_ALERT_IPV6 = 0xD7,
+	MLXSW_TRAP_ID_DISCARD_NON_ROUTABLE = 0x11A,
 	MLXSW_TRAP_ID_DISCARD_ROUTER2 = 0x130,
 	MLXSW_TRAP_ID_DISCARD_ROUTER3 = 0x131,
 	MLXSW_TRAP_ID_DISCARD_ING_PACKET_SMAC_MC = 0x140,