net/mlx5e: Add trap entity to ETH driver

Introduce mlx5e_trap which includes a dedicated RQ and NAPI for trapped
packets. Trap-RQ processes packets that were destined to be dropped,
but for debug and visibility sake these packets are trapped and reported
to devlink.
Trap-RQ connects between the HW and the driver and is not a part of a
channel. Open mlx5e_create_rq() and mlx5_core_destroy_rq() as API and
add dedicate RQ handlers which report to devlink of trapped packets.

Signed-off-by: Aya Levin <ayal@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/mellanox/mlx5/core/Makefile

@@ -27,7 +27,7 @@ mlx5_core-$(CONFIG_MLX5_CORE_EN) += en_main.o en_common.o en_fs.o en_ethtool.o \
 		en_selftest.o en/port.o en/monitor_stats.o en/health.o \
 		en/reporter_tx.o en/reporter_rx.o en/params.o en/xsk/pool.o \
 		en/xsk/setup.o en/xsk/rx.o en/xsk/tx.o en/devlink.o en/ptp.o \
-		en/qos.o
+		en/qos.o en/trap.o
 
 #
 # Netdev extra

drivers/net/ethernet/mellanox/mlx5/core/en.h

@@ -564,6 +564,7 @@ typedef bool (*mlx5e_fp_post_rx_wqes)(struct mlx5e_rq *rq);
 typedef void (*mlx5e_fp_dealloc_wqe)(struct mlx5e_rq*, u16);
 
 int mlx5e_rq_set_handlers(struct mlx5e_rq *rq, struct mlx5e_params *params, bool xsk);
+void mlx5e_rq_set_trap_handlers(struct mlx5e_rq *rq, struct mlx5e_params *params);
 
 enum mlx5e_rq_flag {
 	MLX5E_RQ_FLAG_XDP_XMIT,
@@ -805,6 +806,8 @@ struct mlx5e_htb {
 	u16 defcls;
 };
 
+struct mlx5e_trap;
+
 struct mlx5e_priv {
 	/* priv data path fields - start */
 	/* +1 for port ptp ts */
@@ -844,8 +847,10 @@ struct mlx5e_priv {
 
 	struct mlx5_core_dev      *mdev;
 	struct net_device         *netdev;
+	struct mlx5e_trap         *en_trap;
 	struct mlx5e_stats         stats;
 	struct mlx5e_channel_stats channel_stats[MLX5E_MAX_NUM_CHANNELS];
+	struct mlx5e_channel_stats trap_stats;
 	struct mlx5e_port_ptp_stats port_ptp_stats;
 	u16                        max_nch;
 	u8                         max_opened_tc;
@@ -961,6 +966,8 @@ int mlx5e_open_rq(struct mlx5e_channel *c, struct mlx5e_params *params,
 int mlx5e_wait_for_min_rx_wqes(struct mlx5e_rq *rq, int wait_time);
 void mlx5e_deactivate_rq(struct mlx5e_rq *rq);
 void mlx5e_close_rq(struct mlx5e_rq *rq);
+int mlx5e_create_rq(struct mlx5e_rq *rq, struct mlx5e_rq_param *param);
+void mlx5e_destroy_rq(struct mlx5e_rq *rq);
 
 struct mlx5e_sq_param;
 int mlx5e_open_icosq(struct mlx5e_channel *c, struct mlx5e_params *params,