net/mlx5: Add MACsec Rx tables support to fs_core

Add new namespace for MACsec RX flows.
Encrypted MACsec packets should be first decrypted and stripped
from MACsec header and then continues with the kernel's steering
pipeline.

Signed-off-by: Lior Nahmanson <liorna@nvidia.com>
Reviewed-by: Raed Salem <raeds@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: Lior Nahmanson

drivers/net/ethernet/mellanox/mlx5/core/fs_cmd.c

@@ -922,6 +922,7 @@ static int mlx5_cmd_modify_header_alloc(struct mlx5_flow_root_namespace *ns,
 		max_actions = MLX5_CAP_ESW_FLOWTABLE_FDB(dev, max_modify_header_actions);
 		table_type = FS_FT_FDB;
 		break;
+	case MLX5_FLOW_NAMESPACE_KERNEL_RX_MACSEC:
 	case MLX5_FLOW_NAMESPACE_KERNEL:
 	case MLX5_FLOW_NAMESPACE_BYPASS:
 		max_actions = MLX5_CAP_FLOWTABLE_NIC_RX(dev, max_modify_header_actions);

drivers/net/ethernet/mellanox/mlx5/core/fs_core.c

@@ -104,6 +104,10 @@
 #define BY_PASS_MIN_LEVEL (ETHTOOL_MIN_LEVEL + MLX5_BY_PASS_NUM_PRIOS +\
 			   LEFTOVERS_NUM_PRIOS)
 
+#define KERNEL_RX_MACSEC_NUM_PRIOS  1
+#define KERNEL_RX_MACSEC_NUM_LEVELS 2
+#define KERNEL_RX_MACSEC_MIN_LEVEL (BY_PASS_MIN_LEVEL + KERNEL_RX_MACSEC_NUM_PRIOS)
+
 #define ETHTOOL_PRIO_NUM_LEVELS 1
 #define ETHTOOL_NUM_PRIOS 11
 #define ETHTOOL_MIN_LEVEL (KERNEL_MIN_LEVEL + ETHTOOL_NUM_PRIOS)
@@ -126,7 +130,7 @@
 
 #define LAG_PRIO_NUM_LEVELS 1
 #define LAG_NUM_PRIOS 1
-#define LAG_MIN_LEVEL (OFFLOADS_MIN_LEVEL + 1)
+#define LAG_MIN_LEVEL (OFFLOADS_MIN_LEVEL + KERNEL_RX_MACSEC_MIN_LEVEL + 1)
 
 #define KERNEL_TX_IPSEC_NUM_PRIOS  1
 #define KERNEL_TX_IPSEC_NUM_LEVELS 1
@@ -153,12 +157,16 @@ static struct init_tree_node {
 	enum mlx5_flow_table_miss_action def_miss_action;
 } root_fs = {
 	.type = FS_TYPE_NAMESPACE,
-	.ar_size = 7,
+	.ar_size = 8,
 	  .children = (struct init_tree_node[]){
 		  ADD_PRIO(0, BY_PASS_MIN_LEVEL, 0, FS_CHAINING_CAPS,
 			   ADD_NS(MLX5_FLOW_TABLE_MISS_ACTION_DEF,
 				  ADD_MULTIPLE_PRIO(MLX5_BY_PASS_NUM_PRIOS,
 						    BY_PASS_PRIO_NUM_LEVELS))),
+		  ADD_PRIO(0, KERNEL_RX_MACSEC_MIN_LEVEL, 0, FS_CHAINING_CAPS,
+			   ADD_NS(MLX5_FLOW_TABLE_MISS_ACTION_DEF,
+				  ADD_MULTIPLE_PRIO(KERNEL_RX_MACSEC_NUM_PRIOS,
+						    KERNEL_RX_MACSEC_NUM_LEVELS))),
 		  ADD_PRIO(0, LAG_MIN_LEVEL, 0, FS_CHAINING_CAPS,
 			   ADD_NS(MLX5_FLOW_TABLE_MISS_ACTION_DEF,
 				  ADD_MULTIPLE_PRIO(LAG_NUM_PRIOS,
@@ -2278,6 +2286,7 @@ static bool is_nic_rx_ns(enum mlx5_flow_namespace_type type)
 {
 	switch (type) {
 	case MLX5_FLOW_NAMESPACE_BYPASS:
+	case MLX5_FLOW_NAMESPACE_KERNEL_RX_MACSEC:
 	case MLX5_FLOW_NAMESPACE_LAG:
 	case MLX5_FLOW_NAMESPACE_OFFLOADS:
 	case MLX5_FLOW_NAMESPACE_ETHTOOL:

include/linux/mlx5/fs.h

@@ -79,6 +79,7 @@ static inline void build_leftovers_ft_param(int *priority,
 
 enum mlx5_flow_namespace_type {
 	MLX5_FLOW_NAMESPACE_BYPASS,
+	MLX5_FLOW_NAMESPACE_KERNEL_RX_MACSEC,
 	MLX5_FLOW_NAMESPACE_LAG,
 	MLX5_FLOW_NAMESPACE_OFFLOADS,
 	MLX5_FLOW_NAMESPACE_ETHTOOL,