net/mlx5e: Make mlx5e_tc_table private

Move mlx5e_tc_table struct to en_tc.c thus make it private.
Introduce allocation and deallocation functions as part of the tc API
to allow this switch smoothly.

Convert mlx5e_nic_chain() macro to a function of en_tc.c.

Signed-off-by: Lama Kayal <[email protected]>
Reviewed-by: Tariq Toukan <[email protected]>
Signed-off-by: Saeed Mahameed <[email protected]>

Author: Lama Kayal

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

@@ -15,30 +15,6 @@ enum {
 	MLX5E_TC_MISS_LEVEL,
 };
 
-struct mlx5e_tc_table {
-	/* Protects the dynamic assignment of the t parameter
-	 * which is the nic tc root table.
-	 */
-	struct mutex			t_lock;
-	struct mlx5e_priv		*priv;
-	struct mlx5_flow_table		*t;
-	struct mlx5_flow_table		*miss_t;
-	struct mlx5_fs_chains           *chains;
-	struct mlx5e_post_act		*post_act;
-
-	struct rhashtable               ht;
-
-	struct mod_hdr_tbl mod_hdr;
-	struct mutex hairpin_tbl_lock; /* protects hairpin_tbl */
-	DECLARE_HASHTABLE(hairpin_tbl, 8);
-
-	struct notifier_block     netdevice_nb;
-	struct netdev_net_notifier	netdevice_nn;
-
-	struct mlx5_tc_ct_priv         *ct;
-	struct mapping_ctx             *mapping;
-};
-
 struct mlx5e_flow_table {
 	int num_groups;
 	struct mlx5_flow_table *t;

drivers/net/ethernet/mellanox/mlx5/core/en/tc/act/goto.c

@@ -21,7 +21,7 @@ validate_goto_chain(struct mlx5e_priv *priv,
 	u32 max_chain;
 
 	esw = priv->mdev->priv.eswitch;
-	chains = is_esw ? esw_chains(esw) : mlx5e_nic_chains(priv);
+	chains = is_esw ? esw_chains(esw) : mlx5e_nic_chains(priv->fs.tc);
 	max_chain = mlx5_chains_get_chain_range(chains);
 	reformat_and_fwd = is_esw ?
 			   MLX5_CAP_ESW_FLOWTABLE_FDB(priv->mdev, reformat_and_fwd_to_table) :

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

@@ -11,7 +11,6 @@
 
 #define MLX5E_TC_MAX_SPLITS 1
 
-#define mlx5e_nic_chains(priv) ((priv)->fs.tc->chains)
 
 enum {
 	MLX5E_TC_FLOW_FLAG_INGRESS               = MLX5E_TC_FLAG_INGRESS_BIT,
@@ -44,6 +43,8 @@ struct mlx5e_tc_flow_parse_attr {
 	struct mlx5e_tc_act_parse_state parse_state;
 };
 
+struct mlx5_fs_chains *mlx5e_nic_chains(struct mlx5e_tc_table *tc);
+
 /* Helper struct for accessing a struct containing list_head array.
  * Containing struct
  *   |- Helper array

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

@@ -38,6 +38,7 @@
 #include <linux/mlx5/mpfs.h>
 #include "en.h"
 #include "en_rep.h"
+#include "en_tc.h"
 #include "lib/mpfs.h"
 #include "en/ptp.h"
 
@@ -1347,9 +1348,11 @@ int mlx5e_fs_init(struct mlx5e_priv *priv)
 	priv->fs.vlan = kvzalloc(sizeof(*priv->fs.vlan), GFP_KERNEL);
 	if (!priv->fs.vlan)
 		goto err;
-	priv->fs.tc = kvzalloc(sizeof(*priv->fs.tc), GFP_KERNEL);
-	if (!priv->fs.tc)
+
+	priv->fs.tc = mlx5e_tc_table_alloc();
+	if (IS_ERR(priv->fs.tc))
 		goto err_free_vlan;
+
 	return 0;
 err_free_vlan:
 	kvfree(priv->fs.vlan);
@@ -1360,7 +1363,7 @@ int mlx5e_fs_init(struct mlx5e_priv *priv)
 
 void mlx5e_fs_cleanup(struct mlx5e_priv *priv)
 {
-	kvfree(priv->fs.tc);
+	mlx5e_tc_table_free(priv->fs.tc);
 	kvfree(priv->fs.vlan);
 	priv->fs.vlan = NULL;
 }

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

@@ -71,6 +71,30 @@
 #define MLX5E_TC_TABLE_NUM_GROUPS 4
 #define MLX5E_TC_TABLE_MAX_GROUP_SIZE BIT(18)
 
+struct mlx5e_tc_table {
+	/* Protects the dynamic assignment of the t parameter
+	 * which is the nic tc root table.
+	 */
+	struct mutex			t_lock;
+	struct mlx5e_priv		*priv;
+	struct mlx5_flow_table		*t;
+	struct mlx5_flow_table		*miss_t;
+	struct mlx5_fs_chains           *chains;
+	struct mlx5e_post_act		*post_act;
+
+	struct rhashtable               ht;
+
+	struct mod_hdr_tbl mod_hdr;
+	struct mutex hairpin_tbl_lock; /* protects hairpin_tbl */
+	DECLARE_HASHTABLE(hairpin_tbl, 8);
+
+	struct notifier_block     netdevice_nb;
+	struct netdev_net_notifier	netdevice_nn;
+
+	struct mlx5_tc_ct_priv         *ct;
+	struct mapping_ctx             *mapping;
+};
+
 struct mlx5e_tc_attr_to_reg_mapping mlx5e_tc_attr_to_reg_mappings[] = {
 	[CHAIN_TO_REG] = {
 		.mfield = MLX5_ACTION_IN_FIELD_METADATA_REG_C_0,
@@ -108,6 +132,24 @@ struct mlx5e_tc_attr_to_reg_mapping mlx5e_tc_attr_to_reg_mappings[] = {
 	[PACKET_COLOR_TO_REG] = packet_color_to_reg,
 };
 
+struct mlx5e_tc_table *mlx5e_tc_table_alloc(void)
+{
+	struct mlx5e_tc_table *tc;
+
+	tc = kvzalloc(sizeof(*tc), GFP_KERNEL);
+	return tc ? tc : ERR_PTR(-ENOMEM);
+}
+
+void mlx5e_tc_table_free(struct mlx5e_tc_table *tc)
+{
+	kvfree(tc);
+}
+
+struct mlx5_fs_chains *mlx5e_nic_chains(struct mlx5e_tc_table *tc)
+{
+	return tc->chains;
+}
+
 /* To avoid false lock dependency warning set the tc_ht lock
  * class different than the lock class of the ht being used when deleting
  * last flow from a group and then deleting a group, we get into del_sw_flow_group()
@@ -1084,10 +1126,10 @@ mlx5e_add_offloaded_nic_rule(struct mlx5e_priv *priv,
 			     struct mlx5_flow_attr *attr)
 {
 	struct mlx5_flow_context *flow_context = &spec->flow_context;
-	struct mlx5_fs_chains *nic_chains = mlx5e_nic_chains(priv);
 	struct mlx5_nic_flow_attr *nic_attr = attr->nic_attr;
 	struct mlx5e_tc_table *tc = priv->fs.tc;
 	struct mlx5_flow_destination dest[2] = {};
+	struct mlx5_fs_chains *nic_chains;
 	struct mlx5_flow_act flow_act = {
 		.action = attr->action,
 		.flags    = FLOW_ACT_NO_APPEND,
@@ -1096,6 +1138,7 @@ mlx5e_add_offloaded_nic_rule(struct mlx5e_priv *priv,
 	struct mlx5_flow_table *ft;
 	int dest_ix = 0;
 
+	nic_chains = mlx5e_nic_chains(tc);
 	flow_context->flags |= FLOW_CONTEXT_HAS_TAG;
 	flow_context->flow_tag = nic_attr->flow_tag;
 
@@ -1250,7 +1293,7 @@ void mlx5e_del_offloaded_nic_rule(struct mlx5e_priv *priv,
 				  struct mlx5_flow_handle *rule,
 				  struct mlx5_flow_attr *attr)
 {
-	struct mlx5_fs_chains *nic_chains = mlx5e_nic_chains(priv);
+	struct mlx5_fs_chains *nic_chains = mlx5e_nic_chains(priv->fs.tc);
 
 	mlx5_del_flow_rules(rule);
 
@@ -1282,7 +1325,7 @@ static void mlx5e_tc_del_nic_flow(struct mlx5e_priv *priv,
 	mutex_lock(&priv->fs.tc->t_lock);
 	if (!mlx5e_tc_num_filters(priv, MLX5_TC_FLAG(NIC_OFFLOAD)) &&
 	    !IS_ERR_OR_NULL(tc->t)) {
-		mlx5_chains_put_table(mlx5e_nic_chains(priv), 0, 1, MLX5E_TC_FT_LEVEL);
+		mlx5_chains_put_table(mlx5e_nic_chains(tc), 0, 1, MLX5E_TC_FT_LEVEL);
 		priv->fs.tc->t = NULL;
 	}
 	mutex_unlock(&priv->fs.tc->t_lock);

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

@@ -356,6 +356,8 @@ mlx5e_setup_tc_block_cb(enum tc_setup_type type, void *type_data, void *cb_priv)
 #endif
 
 #if IS_ENABLED(CONFIG_MLX5_CLS_ACT)
+struct mlx5e_tc_table *mlx5e_tc_table_alloc(void);
+void mlx5e_tc_table_free(struct mlx5e_tc_table *tc);
 static inline bool mlx5e_cqe_regb_chain(struct mlx5_cqe64 *cqe)
 {
 #if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
@@ -376,6 +378,8 @@ static inline bool mlx5e_cqe_regb_chain(struct mlx5_cqe64 *cqe)
 
 bool mlx5e_tc_update_skb(struct mlx5_cqe64 *cqe, struct sk_buff *skb);
 #else /* CONFIG_MLX5_CLS_ACT */
+static inline struct mlx5e_tc_table *mlx5e_tc_table_alloc(void) { return NULL; }
+static inline void mlx5e_tc_table_free(struct mlx5e_tc_table *tc) {}
 static inline bool mlx5e_cqe_regb_chain(struct mlx5_cqe64 *cqe)
 { return false; }
 static inline bool