net/mlx5e: Extract tc tunnel encap/decap code to dedicated file

Following patches in series extend the extracted code with routing
infrastructure. To improve code modularity created a dedicated
tc_tun_encap.c source file and move encap/decap related code to the new
file. Export code that is used by both regular TC code and encap/decap code
into tc_priv.h (new header intended to be used only by TC module). Rename
some exported functions by adding "mlx5e_" prefix to their names.

Signed-off-by: Vlad Buslov <vladbu@nvidia.com>
Signed-off-by: Dmytro Linkin <dlinkin@nvidia.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

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

@@ -40,7 +40,7 @@ mlx5_core-$(CONFIG_MLX5_ESWITCH)     += lag_mp.o lib/geneve.o lib/port_tun.o \
 					en_rep.o en/rep/bond.o en/mod_hdr.o
 mlx5_core-$(CONFIG_MLX5_CLS_ACT)     += en_tc.o en/rep/tc.o en/rep/neigh.o \
 					en/mapping.o lib/fs_chains.o en/tc_tun.o \
-					esw/indir_table.o \
+					esw/indir_table.o en/tc_tun_encap.o \
 					en/tc_tun_vxlan.o en/tc_tun_gre.o en/tc_tun_geneve.o \
 					en/tc_tun_mplsoudp.o diag/en_tc_tracepoint.o
 mlx5_core-$(CONFIG_MLX5_TC_CT)	     += en/tc_ct.o

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

@@ -0,0 +1,163 @@
+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
+/* Copyright (c) 2021 Mellanox Technologies. */
+
+#ifndef __MLX5_EN_TC_PRIV_H__
+#define __MLX5_EN_TC_PRIV_H__
+
+#include "en_tc.h"
+
+#define MLX5E_TC_FLOW_BASE (MLX5E_TC_FLAG_LAST_EXPORTED_BIT + 1)
+
+#define MLX5E_TC_MAX_SPLITS 1
+
+enum {
+	MLX5E_TC_FLOW_FLAG_INGRESS               = MLX5E_TC_FLAG_INGRESS_BIT,
+	MLX5E_TC_FLOW_FLAG_EGRESS                = MLX5E_TC_FLAG_EGRESS_BIT,
+	MLX5E_TC_FLOW_FLAG_ESWITCH               = MLX5E_TC_FLAG_ESW_OFFLOAD_BIT,
+	MLX5E_TC_FLOW_FLAG_FT                    = MLX5E_TC_FLAG_FT_OFFLOAD_BIT,
+	MLX5E_TC_FLOW_FLAG_NIC                   = MLX5E_TC_FLAG_NIC_OFFLOAD_BIT,
+	MLX5E_TC_FLOW_FLAG_OFFLOADED             = MLX5E_TC_FLOW_BASE,
+	MLX5E_TC_FLOW_FLAG_HAIRPIN               = MLX5E_TC_FLOW_BASE + 1,
+	MLX5E_TC_FLOW_FLAG_HAIRPIN_RSS           = MLX5E_TC_FLOW_BASE + 2,
+	MLX5E_TC_FLOW_FLAG_SLOW                  = MLX5E_TC_FLOW_BASE + 3,
+	MLX5E_TC_FLOW_FLAG_DUP                   = MLX5E_TC_FLOW_BASE + 4,
+	MLX5E_TC_FLOW_FLAG_NOT_READY             = MLX5E_TC_FLOW_BASE + 5,
+	MLX5E_TC_FLOW_FLAG_DELETED               = MLX5E_TC_FLOW_BASE + 6,
+	MLX5E_TC_FLOW_FLAG_CT                    = MLX5E_TC_FLOW_BASE + 7,
+	MLX5E_TC_FLOW_FLAG_L3_TO_L2_DECAP        = MLX5E_TC_FLOW_BASE + 8,
+};
+
+struct mlx5e_tc_flow_parse_attr {
+	const struct ip_tunnel_info *tun_info[MLX5_MAX_FLOW_FWD_VPORTS];
+	struct net_device *filter_dev;
+	struct mlx5_flow_spec spec;
+	struct mlx5e_tc_mod_hdr_acts mod_hdr_acts;
+	int mirred_ifindex[MLX5_MAX_FLOW_FWD_VPORTS];
+	struct ethhdr eth;
+};
+
+/* Helper struct for accessing a struct containing list_head array.
+ * Containing struct
+ *   |- Helper array
+ *      [0] Helper item 0
+ *          |- list_head item 0
+ *          |- index (0)
+ *      [1] Helper item 1
+ *          |- list_head item 1
+ *          |- index (1)
+ * To access the containing struct from one of the list_head items:
+ * 1. Get the helper item from the list_head item using
+ *    helper item =
+ *        container_of(list_head item, helper struct type, list_head field)
+ * 2. Get the contining struct from the helper item and its index in the array:
+ *    containing struct =
+ *        container_of(helper item, containing struct type, helper field[index])
+ */
+struct encap_flow_item {
+	struct mlx5e_encap_entry *e; /* attached encap instance */
+	struct list_head list;
+	int index;
+};
+
+struct mlx5e_tc_flow {
+	struct rhash_head node;
+	struct mlx5e_priv *priv;
+	u64 cookie;
+	unsigned long flags;
+	struct mlx5_flow_handle *rule[MLX5E_TC_MAX_SPLITS + 1];
+
+	/* flows sharing the same reformat object - currently mpls decap */
+	struct list_head l3_to_l2_reformat;
+	struct mlx5e_decap_entry *decap_reformat;
+
+	/* Flow can be associated with multiple encap IDs.
+	 * The number of encaps is bounded by the number of supported
+	 * destinations.
+	 */
+	struct encap_flow_item encaps[MLX5_MAX_FLOW_FWD_VPORTS];
+	struct mlx5e_tc_flow *peer_flow;
+	struct mlx5e_mod_hdr_handle *mh; /* attached mod header instance */
+	struct mlx5e_hairpin_entry *hpe; /* attached hairpin instance */
+	struct list_head hairpin; /* flows sharing the same hairpin */
+	struct list_head peer;    /* flows with peer flow */
+	struct list_head unready; /* flows not ready to be offloaded (e.g
+				   * due to missing route)
+				   */
+	struct net_device *orig_dev; /* netdev adding flow first */
+	int tmp_efi_index;
+	struct list_head tmp_list; /* temporary flow list used by neigh update */
+	refcount_t refcnt;
+	struct rcu_head rcu_head;
+	struct completion init_done;
+	int tunnel_id; /* the mapped tunnel id of this flow */
+	struct mlx5_flow_attr *attr;
+};
+
+u8 mlx5e_tc_get_ip_version(struct mlx5_flow_spec *spec, bool outer);
+
+struct mlx5_flow_handle *
+mlx5e_tc_offload_fdb_rules(struct mlx5_eswitch *esw,
+			   struct mlx5e_tc_flow *flow,
+			   struct mlx5_flow_spec *spec,
+			   struct mlx5_flow_attr *attr);
+
+bool mlx5e_is_offloaded_flow(struct mlx5e_tc_flow *flow);
+
+static inline void __flow_flag_set(struct mlx5e_tc_flow *flow, unsigned long flag)
+{
+	/* Complete all memory stores before setting bit. */
+	smp_mb__before_atomic();
+	set_bit(flag, &flow->flags);
+}
+
+#define flow_flag_set(flow, flag) __flow_flag_set(flow, MLX5E_TC_FLOW_FLAG_##flag)
+
+static inline bool __flow_flag_test_and_set(struct mlx5e_tc_flow *flow,
+					    unsigned long flag)
+{
+	/* test_and_set_bit() provides all necessary barriers */
+	return test_and_set_bit(flag, &flow->flags);
+}
+
+#define flow_flag_test_and_set(flow, flag)			\
+	__flow_flag_test_and_set(flow,				\
+				 MLX5E_TC_FLOW_FLAG_##flag)
+
+static inline void __flow_flag_clear(struct mlx5e_tc_flow *flow, unsigned long flag)
+{
+	/* Complete all memory stores before clearing bit. */
+	smp_mb__before_atomic();
+	clear_bit(flag, &flow->flags);
+}
+
+#define flow_flag_clear(flow, flag) __flow_flag_clear(flow,		\
+						      MLX5E_TC_FLOW_FLAG_##flag)
+
+static inline bool __flow_flag_test(struct mlx5e_tc_flow *flow, unsigned long flag)
+{
+	bool ret = test_bit(flag, &flow->flags);
+
+	/* Read fields of flow structure only after checking flags. */
+	smp_mb__after_atomic();
+	return ret;
+}
+
+#define flow_flag_test(flow, flag) __flow_flag_test(flow,		\
+						    MLX5E_TC_FLOW_FLAG_##flag)
+
+void mlx5e_tc_unoffload_from_slow_path(struct mlx5_eswitch *esw,
+				       struct mlx5e_tc_flow *flow);
+struct mlx5_flow_handle *
+mlx5e_tc_offload_to_slow_path(struct mlx5_eswitch *esw,
+			      struct mlx5e_tc_flow *flow,
+			      struct mlx5_flow_spec *spec);
+void mlx5e_tc_unoffload_fdb_rules(struct mlx5_eswitch *esw,
+				  struct mlx5e_tc_flow *flow,
+				  struct mlx5_flow_attr *attr);
+
+struct mlx5e_tc_flow *mlx5e_flow_get(struct mlx5e_tc_flow *flow);
+void mlx5e_flow_put(struct mlx5e_priv *priv, struct mlx5e_tc_flow *flow);
+
+struct mlx5_fc *mlx5e_tc_get_counter(struct mlx5e_tc_flow *flow);
+
+#endif /* __MLX5_EN_TC_PRIV_H__ */

drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c

@@ -6,6 +6,7 @@
 #include <net/geneve.h>
 #include <net/bareudp.h>
 #include "en/tc_tun.h"
+#include "en/tc_priv.h"
 #include "en_tc.h"
 #include "rep/tc.h"
 #include "rep/neigh.h"