mlxsw: spectrum: Use dedicated trap group for ACL trap

Packets that are trapped via tc's trap action are currently subject to
the same policer as packets hitting local routes. The latter are
critical to the correct functioning of the control plane, while the
former are mainly used for traffic inspection.

Split the ACL trap to a separate group with its own policer. Use a
higher priority for these traps than for traps using mirror action
(e.g., ARP, IGMP). Otherwise, packets matching both traps will not be
forwarded in hardware (because of trap action) and also not forwarded in
software because they will be marked with 'offload_fwd_mark'.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -5548,6 +5548,7 @@ enum mlxsw_reg_htgt_trap_group {
 	MLXSW_REG_HTGT_TRAP_GROUP_SP_PTP1,
 	MLXSW_REG_HTGT_TRAP_GROUP_SP_VRRP,
 	MLXSW_REG_HTGT_TRAP_GROUP_SP_PKT_SAMPLE,
+	MLXSW_REG_HTGT_TRAP_GROUP_SP_FLOW_LOGGING,
 
 	__MLXSW_REG_HTGT_TRAP_GROUP_MAX,
 	MLXSW_REG_HTGT_TRAP_GROUP_MAX = __MLXSW_REG_HTGT_TRAP_GROUP_MAX - 1

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

@@ -4105,7 +4105,7 @@ static const struct mlxsw_listener mlxsw_sp_listener[] = {
 	MLXSW_RXL(mlxsw_sp_rx_listener_sample_func, PKT_SAMPLE, MIRROR_TO_CPU,
 		  false, SP_PKT_SAMPLE, DISCARD),
 	/* ACL trap */
-	MLXSW_SP_RXL_NO_MARK(ACL0, TRAP_TO_CPU, IP2ME, false),
+	MLXSW_SP_RXL_NO_MARK(ACL0, TRAP_TO_CPU, FLOW_LOGGING, false),
 	/* Multicast Router Traps */
 	MLXSW_SP_RXL_MARK(IPV4_PIM, TRAP_TO_CPU, PIM, false),
 	MLXSW_SP_RXL_MARK(IPV6_PIM, TRAP_TO_CPU, PIM, false),
@@ -4167,6 +4167,7 @@ static int mlxsw_sp_cpu_policers_set(struct mlxsw_core *mlxsw_core)
 		case MLXSW_REG_HTGT_TRAP_GROUP_SP_REMOTE_ROUTE:
 		case MLXSW_REG_HTGT_TRAP_GROUP_SP_IPV6_ND:
 		case MLXSW_REG_HTGT_TRAP_GROUP_SP_MULTICAST:
+		case MLXSW_REG_HTGT_TRAP_GROUP_SP_FLOW_LOGGING:
 			rate = 1024;
 			burst_size = 7;
 			break;
@@ -4230,6 +4231,7 @@ static int mlxsw_sp_trap_groups_set(struct mlxsw_core *mlxsw_core)
 			priority = 5;
 			tc = 5;
 			break;
+		case MLXSW_REG_HTGT_TRAP_GROUP_SP_FLOW_LOGGING:
 		case MLXSW_REG_HTGT_TRAP_GROUP_SP_BGP:
 			priority = 4;
 			tc = 4;