net/mlx5: Add create alias flow table function to ipsec roce

Implements functions which creates an alias flow table, and check
if alias flow table creation is even supported, and if successful
returns the created alias flow table object id.

This function would be used in later patches to allow jumping from
one vhca to another, in order to add support for MPV mode.

Signed-off-by: Patrisious Haddad <phaddad@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Link: https://lore.kernel.org/r/36e15ef41586f2a9aacc65b935de18391eef5607.1695296682.git.leon@kernel.org
Signed-off-by: Leon Romanovsky <leon@kernel.org>

Author: PatrisiousHaddad

drivers/net/ethernet/mellanox/mlx5/core/lib/ipsec_fs_roce.c

@@ -4,6 +4,7 @@
 #include "fs_core.h"
 #include "lib/ipsec_fs_roce.h"
 #include "mlx5_core.h"
+#include <linux/random.h>
 
 struct mlx5_ipsec_miss {
 	struct mlx5_flow_group *group;
@@ -44,6 +45,71 @@ static void ipsec_fs_roce_setup_udp_dport(struct mlx5_flow_spec *spec,
 	MLX5_SET(fte_match_param, spec->match_value, outer_headers.udp_dport, dport);
 }
 
+static bool ipsec_fs_create_alias_supported(struct mlx5_core_dev *mdev,
+					    struct mlx5_core_dev *master_mdev)
+{
+	u64 obj_allowed_m = MLX5_CAP_GEN_2_64(master_mdev, allowed_object_for_other_vhca_access);
+	u32 obj_supp_m = MLX5_CAP_GEN_2(master_mdev, cross_vhca_object_to_object_supported);
+	u64 obj_allowed = MLX5_CAP_GEN_2_64(mdev, allowed_object_for_other_vhca_access);
+	u32 obj_supp = MLX5_CAP_GEN_2(mdev, cross_vhca_object_to_object_supported);
+
+	if (!(obj_supp &
+	    MLX5_CROSS_VHCA_OBJ_TO_OBJ_SUPPORTED_LOCAL_FLOW_TABLE_TO_REMOTE_FLOW_TABLE_MISS) ||
+	    !(obj_supp_m &
+	    MLX5_CROSS_VHCA_OBJ_TO_OBJ_SUPPORTED_LOCAL_FLOW_TABLE_TO_REMOTE_FLOW_TABLE_MISS))
+		return false;
+
+	if (!(obj_allowed & MLX5_ALLOWED_OBJ_FOR_OTHER_VHCA_ACCESS_FLOW_TABLE) ||
+	    !(obj_allowed_m & MLX5_ALLOWED_OBJ_FOR_OTHER_VHCA_ACCESS_FLOW_TABLE))
+		return false;
+
+	return true;
+}
+
+static int ipsec_fs_create_aliased_ft(struct mlx5_core_dev *ibv_owner,
+				      struct mlx5_core_dev *ibv_allowed,
+				      struct mlx5_flow_table *ft,
+				      u32 *obj_id)
+{
+	u32 aliased_object_id = (ft->type << FT_ID_FT_TYPE_OFFSET) | ft->id;
+	u16 vhca_id_to_be_accessed = MLX5_CAP_GEN(ibv_owner, vhca_id);
+	struct mlx5_cmd_allow_other_vhca_access_attr allow_attr = {};
+	struct mlx5_cmd_alias_obj_create_attr alias_attr = {};
+	char key[ACCESS_KEY_LEN];
+	int ret;
+	int i;
+
+	if (!ipsec_fs_create_alias_supported(ibv_owner, ibv_allowed))
+		return -EOPNOTSUPP;
+
+	for (i = 0; i < ACCESS_KEY_LEN; i++)
+		key[i] = get_random_u64() & 0xFF;
+
+	memcpy(allow_attr.access_key, key, ACCESS_KEY_LEN);
+	allow_attr.obj_type = MLX5_GENERAL_OBJECT_TYPES_FLOW_TABLE_ALIAS;
+	allow_attr.obj_id = aliased_object_id;
+
+	ret = mlx5_cmd_allow_other_vhca_access(ibv_owner, &allow_attr);
+	if (ret) {
+		mlx5_core_err(ibv_owner, "Failed to allow other vhca access err=%d\n",
+			      ret);
+		return ret;
+	}
+
+	memcpy(alias_attr.access_key, key, ACCESS_KEY_LEN);
+	alias_attr.obj_id = aliased_object_id;
+	alias_attr.obj_type = MLX5_GENERAL_OBJECT_TYPES_FLOW_TABLE_ALIAS;
+	alias_attr.vhca_id = vhca_id_to_be_accessed;
+	ret = mlx5_cmd_alias_obj_create(ibv_allowed, &alias_attr, obj_id);
+	if (ret) {
+		mlx5_core_err(ibv_allowed, "Failed to create alias object err=%d\n",
+			      ret);
+		return ret;
+	}
+
+	return 0;
+}
+
 static int
 ipsec_fs_roce_rx_rule_setup(struct mlx5_core_dev *mdev,
 			    struct mlx5_flow_destination *default_dst,