net/mlx5: Configure MACsec steering for ingress RoCEv2 traffic

Add steering tables/rules to check if the decrypted traffic is RoCEv2,
if so copy reg_b_metadata to a temp reg and forward it to RDMA_RX domain.
The rules are added once the MACsec device is assigned an IP address
where we verify that the packet ip is for MACsec device and that the temp
reg has MACsec operation and a valid SCI inside.

Signed-off-by: Patrisious Haddad <[e-mail]>
Signed-off-by: Leon Romanovsky <[e-mail]>

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

···
 			   LEFTOVERS_NUM_PRIOS)
 
 #define KERNEL_RX_MACSEC_NUM_PRIOS  1
-#define KERNEL_RX_MACSEC_NUM_LEVELS 2
+#define KERNEL_RX_MACSEC_NUM_LEVELS 3
 #define KERNEL_RX_MACSEC_MIN_LEVEL (BY_PASS_MIN_LEVEL + KERNEL_RX_MACSEC_NUM_PRIOS)
 
 #define ETHTOOL_PRIO_NUM_LEVELS 1

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

···
 #define TX_CHECK_TABLE_NUM_FTE 2
 #define RX_CRYPTO_TABLE_LEVEL 0
 #define RX_CHECK_TABLE_LEVEL 1
+#define RX_ROCE_TABLE_LEVEL 2
 #define RX_CHECK_TABLE_NUM_FTE 3
+#define RX_ROCE_TABLE_NUM_FTE 2
 #define RX_CRYPTO_TABLE_NUM_GROUPS 3
 #define RX_CRYPTO_TABLE_SA_RULE_WITH_SCI_GROUP_SIZE \
 	((CRYPTO_NUM_MAXSEC_FTE - CRYPTO_TABLE_DEFAULT_RULE_GROUP_SIZE) / 2)
 #define RX_CRYPTO_TABLE_SA_RULE_WITHOUT_SCI_GROUP_SIZE \
 	(CRYPTO_NUM_MAXSEC_FTE - RX_CRYPTO_TABLE_SA_RULE_WITH_SCI_GROUP_SIZE)
 #define RX_NUM_OF_RULES_PER_SA 2
+
+#define RDMA_RX_ROCE_IP_TABLE_LEVEL 0
+#define RDMA_RX_ROCE_MACSEC_OP_TABLE_LEVEL 1
 
 #define MLX5_MACSEC_TAG_LEN 8 /* SecTAG length with ethertype and without the optional SCI */
 #define MLX5_MACSEC_SECTAG_TCI_AN_FIELD_BITMASK 0x23
···
 	struct mlx5_modify_hdr *meta_modhdr;
 };
 
+struct mlx5_macsec_miss {
+	struct mlx5_flow_group *g;
+	struct mlx5_flow_handle *rule;
+};
+
+struct mlx5_macsec_rx_roce {
+	/* Flow table/rules in NIC domain, to check if it's a RoCE packet */
+	struct mlx5_flow_group *g;
+	struct mlx5_flow_table *ft;
+	struct mlx5_flow_handle *rule;
+	struct mlx5_modify_hdr *copy_modify_hdr;
+	struct mlx5_macsec_miss nic_miss;
+
+	/* Flow table/rule in RDMA domain, to check dgid */
+	struct mlx5_flow_table *ft_ip_check;
+	struct mlx5_flow_table *ft_macsec_op_check;
+	struct mlx5_macsec_miss miss;
+};
+
 struct mlx5_macsec_rx {
 	struct mlx5_flow_handle *check_rule[2];
 	struct mlx5_pkt_reformat *check_rule_pkt_reformat[2];
 
 	struct mlx5_macsec_tables tables;
+	struct mlx5_macsec_rx_roce roce;
 };
 
 union mlx5_macsec_rule {
···
 	return err;
 }
 
+static void macsec_fs_rx_roce_miss_destroy(struct mlx5_macsec_miss *miss)
+{
+	mlx5_del_flow_rules(miss->rule);
+	mlx5_destroy_flow_group(miss->g);
+}
+
+static void macsec_fs_rdma_rx_destroy(struct mlx5_macsec_rx_roce *roce, struct mlx5_core_dev *mdev)
+{
+	if (!mlx5_is_macsec_roce_supported(mdev))
+		return;
+
+	mlx5_del_flow_rules(roce->nic_miss.rule);
+	mlx5_del_flow_rules(roce->rule);
+	mlx5_modify_header_dealloc(mdev, roce->copy_modify_hdr);
+	mlx5_destroy_flow_group(roce->nic_miss.g);
+	mlx5_destroy_flow_group(roce->g);
+	mlx5_destroy_flow_table(roce->ft);
+
+	macsec_fs_rx_roce_miss_destroy(&roce->miss);
+	mlx5_destroy_flow_table(roce->ft_macsec_op_check);
+	mlx5_destroy_flow_table(roce->ft_ip_check);
+}
+
 static void macsec_fs_rx_destroy(struct mlx5_macsec_fs *macsec_fs)
 {
 	struct mlx5_macsec_rx *rx_fs = macsec_fs->rx_fs;
···
 	}
 
 	macsec_fs_destroy_flow_table(&rx_tables->ft_crypto);
+
+	macsec_fs_rdma_rx_destroy(&macsec_fs->rx_fs->roce, macsec_fs->mdev);
 }
 
 static int macsec_fs_rx_create_crypto_table_groups(struct mlx5_macsec_flow_table *ft)
···
 	struct mlx5_pkt_reformat_params reformat_params = {};
 	struct mlx5_macsec_rx *rx_fs = macsec_fs->rx_fs;
 	struct mlx5_core_dev *mdev = macsec_fs->mdev;
+	struct mlx5_flow_destination roce_dest[2];
 	struct mlx5_macsec_tables *rx_tables;
 	struct mlx5_flow_handle *rule;
-	int err = 0;
+	int err = 0, dstn = 0;
 
 	rx_tables = &rx_fs->tables;
 
···
 			 MLX5_MACSEC_SECTAG_TCI_AN_FIELD_OFFSET);
 
 	flow_act->flags = FLOW_ACT_NO_APPEND;
-	flow_act->action = MLX5_FLOW_CONTEXT_ACTION_FWD_NEXT_PRIO |
-			   MLX5_FLOW_CONTEXT_ACTION_PACKET_REFORMAT |
-			   MLX5_FLOW_CONTEXT_ACTION_COUNT;
-	dest->type = MLX5_FLOW_DESTINATION_TYPE_COUNTER;
-	dest->counter_id = mlx5_fc_id(rx_tables->check_rule_counter);
-	rule = mlx5_add_flow_rules(rx_tables->ft_check, spec, flow_act, dest, 1);
+
+	if (rx_fs->roce.ft) {
+		flow_act->action = MLX5_FLOW_CONTEXT_ACTION_FWD_DEST;
+		roce_dest[dstn].type = MLX5_FLOW_DESTINATION_TYPE_FLOW_TABLE;
+		roce_dest[dstn].ft = rx_fs->roce.ft;
+		dstn++;
+	} else {
+		flow_act->action = MLX5_FLOW_CONTEXT_ACTION_FWD_NEXT_PRIO;
+	}
+
+	flow_act->action |= MLX5_FLOW_CONTEXT_ACTION_PACKET_REFORMAT |
+			    MLX5_FLOW_CONTEXT_ACTION_COUNT;
+	roce_dest[dstn].type = MLX5_FLOW_DESTINATION_TYPE_COUNTER;
+	roce_dest[dstn].counter_id = mlx5_fc_id(rx_tables->check_rule_counter);
+	rule = mlx5_add_flow_rules(rx_tables->ft_check, spec, flow_act, roce_dest, dstn + 1);
+
 	if (IS_ERR(rule)) {
 		err = PTR_ERR(rule);
 		mlx5_core_err(mdev, "Failed to add MACsec Rx check rule, err=%d\n", err);
···
 	rx_fs->check_rule[rule_index] = rule;
 
 	return 0;
+}
+
+static int macsec_fs_rx_roce_miss_create(struct mlx5_core_dev *mdev,
+					 struct mlx5_macsec_rx_roce *roce)
+{
+	struct mlx5_flow_act flow_act = {};
+	struct mlx5_flow_group *flow_group;
+	struct mlx5_flow_handle *rule;
+	u32 *flow_group_in;
+	int err;
+
+	flow_group_in = kvzalloc(MLX5_ST_SZ_BYTES(create_flow_group_in), GFP_KERNEL);
+	if (!flow_group_in)
+		return -ENOMEM;
+
+	/* IP check ft has no miss rule since we use default miss action which is go to next PRIO */
+	MLX5_SET(create_flow_group_in, flow_group_in, start_flow_index,
+		 roce->ft_macsec_op_check->max_fte - 1);
+	MLX5_SET(create_flow_group_in, flow_group_in, end_flow_index,
+		 roce->ft_macsec_op_check->max_fte - 1);
+	flow_group = mlx5_create_flow_group(roce->ft_macsec_op_check, flow_group_in);
+	if (IS_ERR(flow_group)) {
+		err = PTR_ERR(flow_group);
+		mlx5_core_err(mdev,
+			      "Failed to create miss flow group for MACsec RoCE operation check table err(%d)\n",
+			      err);
+		goto err_macsec_op_miss_group;
+	}
+	roce->miss.g = flow_group;
+
+	flow_act.action = MLX5_FLOW_CONTEXT_ACTION_DROP;
+	rule = mlx5_add_flow_rules(roce->ft_macsec_op_check,  NULL, &flow_act, NULL, 0);
+	if (IS_ERR(rule)) {
+		err = PTR_ERR(rule);
+		mlx5_core_err(mdev, "Failed to add miss rule to MACsec RoCE operation check table err(%d)\n",
+			      err);
+		goto err_macsec_op_rule;
+	}
+	roce->miss.rule = rule;
+
+	kvfree(flow_group_in);
+	return 0;
+
+err_macsec_op_rule:
+	mlx5_destroy_flow_group(roce->miss.g);
+err_macsec_op_miss_group:
+	kvfree(flow_group_in);
+	return err;
+}
+
+#define MLX5_RX_ROCE_GROUP_SIZE BIT(0)
+
+static int macsec_fs_rx_roce_jump_to_rdma_groups_create(struct mlx5_core_dev *mdev,
+							struct mlx5_macsec_rx_roce *roce)
+{
+	struct mlx5_flow_group *g;
+	void *outer_headers_c;
+	int ix = 0;
+	u32 *in;
+	int err;
+	u8 *mc;
+
+	in = kvzalloc(MLX5_ST_SZ_BYTES(create_flow_group_in), GFP_KERNEL);
+	if (!in)
+		return -ENOMEM;
+
+	mc = MLX5_ADDR_OF(create_flow_group_in, in, match_criteria);
+	outer_headers_c = MLX5_ADDR_OF(fte_match_param, mc, outer_headers);
+	MLX5_SET_TO_ONES(fte_match_set_lyr_2_4, outer_headers_c, ip_protocol);
+	MLX5_SET_TO_ONES(fte_match_set_lyr_2_4, outer_headers_c, udp_dport);
+
+	MLX5_SET_CFG(in, match_criteria_enable, MLX5_MATCH_OUTER_HEADERS);
+	MLX5_SET_CFG(in, start_flow_index, ix);
+	ix += MLX5_RX_ROCE_GROUP_SIZE;
+	MLX5_SET_CFG(in, end_flow_index, ix - 1);
+	g = mlx5_create_flow_group(roce->ft, in);
+	if (IS_ERR(g)) {
+		err = PTR_ERR(g);
+		mlx5_core_err(mdev, "Failed to create main flow group for MACsec RoCE NIC UDP table err(%d)\n",
+			      err);
+		goto err_udp_group;
+	}
+	roce->g = g;
+
+	memset(in, 0, MLX5_ST_SZ_BYTES(create_flow_group_in));
+	MLX5_SET_CFG(in, start_flow_index, ix);
+	ix += MLX5_RX_ROCE_GROUP_SIZE;
+	MLX5_SET_CFG(in, end_flow_index, ix - 1);
+	g = mlx5_create_flow_group(roce->ft, in);
+	if (IS_ERR(g)) {
+		err = PTR_ERR(g);
+		mlx5_core_err(mdev, "Failed to create miss flow group for MACsec RoCE NIC UDP table err(%d)\n",
+			      err);
+		goto err_udp_miss_group;
+	}
+	roce->nic_miss.g = g;
+
+	kvfree(in);
+	return 0;
+
+err_udp_miss_group:
+	mlx5_destroy_flow_group(roce->g);
+err_udp_group:
+	kvfree(in);
+	return err;
+}
+
+static int macsec_fs_rx_roce_jump_to_rdma_rules_create(struct mlx5_macsec_fs *macsec_fs,
+						       struct mlx5_macsec_rx_roce *roce)
+{
+	u8 action[MLX5_UN_SZ_BYTES(set_add_copy_action_in_auto)] = {};
+	struct mlx5_core_dev *mdev = macsec_fs->mdev;
+	struct mlx5_flow_destination dst = {};
+	struct mlx5_modify_hdr *modify_hdr;
+	MLX5_DECLARE_FLOW_ACT(flow_act);
+	struct mlx5_flow_handle *rule;
+	struct mlx5_flow_spec *spec;
+	int err;
+
+	spec = kvzalloc(sizeof(*spec), GFP_KERNEL);
+	if (!spec)
+		return -ENOMEM;
+
+	spec->match_criteria_enable = MLX5_MATCH_OUTER_HEADERS;
+	MLX5_SET_TO_ONES(fte_match_param, spec->match_criteria, outer_headers.ip_protocol);
+	MLX5_SET(fte_match_param, spec->match_value, outer_headers.ip_protocol, IPPROTO_UDP);
+	MLX5_SET_TO_ONES(fte_match_param, spec->match_criteria, outer_headers.udp_dport);
+	MLX5_SET(fte_match_param, spec->match_value, outer_headers.udp_dport, ROCE_V2_UDP_DPORT);
+
+	MLX5_SET(copy_action_in, action, action_type, MLX5_ACTION_TYPE_COPY);
+	MLX5_SET(copy_action_in, action, src_field, MLX5_ACTION_IN_FIELD_METADATA_REG_B);
+	MLX5_SET(copy_action_in, action, src_offset, 0);
+	MLX5_SET(copy_action_in, action, length, 32);
+	MLX5_SET(copy_action_in, action, dst_field, MLX5_ACTION_IN_FIELD_METADATA_REG_C_5);
+	MLX5_SET(copy_action_in, action, dst_offset, 0);
+
+	modify_hdr = mlx5_modify_header_alloc(macsec_fs->mdev, MLX5_FLOW_NAMESPACE_KERNEL_RX_MACSEC,
+					      1, action);
+
+	if (IS_ERR(modify_hdr)) {
+		err = PTR_ERR(modify_hdr);
+		mlx5_core_err(mdev,
+			      "Failed to alloc macsec copy modify_header_id err(%d)\n", err);
+		goto err_alloc_hdr;
+	}
+
+	flow_act.action = MLX5_FLOW_CONTEXT_ACTION_MOD_HDR | MLX5_FLOW_CONTEXT_ACTION_FWD_DEST;
+	flow_act.modify_hdr = modify_hdr;
+	dst.type = MLX5_FLOW_DESTINATION_TYPE_TABLE_TYPE;
+	dst.ft = roce->ft_ip_check;
+	rule = mlx5_add_flow_rules(roce->ft, spec, &flow_act, &dst, 1);
+	if (IS_ERR(rule)) {
+		err = PTR_ERR(rule);
+		mlx5_core_err(mdev, "Failed to add rule to MACsec RoCE NIC UDP table err(%d)\n",
+			      err);
+		goto err_add_rule;
+	}
+	roce->rule = rule;
+	roce->copy_modify_hdr = modify_hdr;
+
+	memset(&flow_act, 0, sizeof(flow_act));
+	flow_act.action = MLX5_FLOW_CONTEXT_ACTION_FWD_NEXT_PRIO;
+	rule = mlx5_add_flow_rules(roce->ft, NULL, &flow_act, NULL, 0);
+	if (IS_ERR(rule)) {
+		err = PTR_ERR(rule);
+		mlx5_core_err(mdev, "Failed to add miss rule to MACsec RoCE NIC UDP table err(%d)\n",
+			      err);
+		goto err_add_rule2;
+	}
+	roce->nic_miss.rule = rule;
+
+	kvfree(spec);
+	return 0;
+
+err_add_rule2:
+	mlx5_del_flow_rules(roce->rule);
+err_add_rule:
+	mlx5_modify_header_dealloc(macsec_fs->mdev, modify_hdr);
+err_alloc_hdr:
+	kvfree(spec);
+	return err;
+}
+
+static int macsec_fs_rx_roce_jump_to_rdma_create(struct mlx5_macsec_fs *macsec_fs,
+						 struct mlx5_macsec_rx_roce *roce)
+{
+	int err;
+
+	err = macsec_fs_rx_roce_jump_to_rdma_groups_create(macsec_fs->mdev, roce);
+	if (err)
+		return err;
+
+	err = macsec_fs_rx_roce_jump_to_rdma_rules_create(macsec_fs, roce);
+	if (err)
+		goto err;
+
+	return 0;
+err:
+	mlx5_destroy_flow_group(roce->nic_miss.g);
+	mlx5_destroy_flow_group(roce->g);
+	return err;
+}
+
+static int macsec_fs_rx_roce_create(struct mlx5_macsec_fs *macsec_fs)
+{
+	struct mlx5_macsec_rx *rx_fs = macsec_fs->rx_fs;
+	struct mlx5_core_dev *mdev = macsec_fs->mdev;
+	struct mlx5_flow_table_attr ft_attr = {};
+	struct mlx5_flow_namespace *ns;
+	struct mlx5_flow_table *ft;
+	int err = 0;
+
+	if (!mlx5_is_macsec_roce_supported(macsec_fs->mdev)) {
+		mlx5_core_dbg(mdev, "Failed to init RoCE MACsec, capabilities not supported\n");
+		return 0;
+	}
+
+	ns = mlx5_get_flow_namespace(macsec_fs->mdev, MLX5_FLOW_NAMESPACE_RDMA_RX_MACSEC);
+	if (!ns)
+		return -ENOMEM;
+
+	ft = macsec_fs_auto_group_table_create(ns, 0, RDMA_RX_ROCE_IP_TABLE_LEVEL,
+					       CRYPTO_NUM_MAXSEC_FTE);
+	if (IS_ERR(ft)) {
+		err = PTR_ERR(ft);
+		mlx5_core_err(mdev,
+			      "Failed to create MACsec IP check RoCE table err(%d)\n", err);
+		return err;
+	}
+	rx_fs->roce.ft_ip_check = ft;
+
+	ft = macsec_fs_auto_group_table_create(ns, 0, RDMA_RX_ROCE_MACSEC_OP_TABLE_LEVEL,
+					       CRYPTO_NUM_MAXSEC_FTE);
+	if (IS_ERR(ft)) {
+		err = PTR_ERR(ft);
+		mlx5_core_err(mdev,
+			      "Failed to create MACsec operation check RoCE table err(%d)\n",
+			      err);
+		goto err_macsec_op;
+	}
+	rx_fs->roce.ft_macsec_op_check = ft;
+
+	err = macsec_fs_rx_roce_miss_create(mdev, &rx_fs->roce);
+	if (err)
+		goto err_miss_create;
+
+	ns = mlx5_get_flow_namespace(macsec_fs->mdev, MLX5_FLOW_NAMESPACE_KERNEL_RX_MACSEC);
+	if (!ns) {
+		err = -EOPNOTSUPP;
+		goto err_ns;
+	}
+
+	ft_attr.level = RX_ROCE_TABLE_LEVEL;
+	ft_attr.max_fte = RX_ROCE_TABLE_NUM_FTE;
+	ft = mlx5_create_flow_table(ns, &ft_attr);
+	if (IS_ERR(ft)) {
+		err = PTR_ERR(ft);
+		mlx5_core_err(mdev,
+			      "Failed to create MACsec jump to RX RoCE, NIC table err(%d)\n", err);
+		goto err_ns;
+	}
+	rx_fs->roce.ft = ft;
+
+	err = macsec_fs_rx_roce_jump_to_rdma_create(macsec_fs, &rx_fs->roce);
+	if (err)
+		goto err_udp_ft;
+
+	return 0;
+
+err_udp_ft:
+	mlx5_destroy_flow_table(rx_fs->roce.ft);
+err_ns:
+	macsec_fs_rx_roce_miss_destroy(&rx_fs->roce.miss);
+err_miss_create:
+	mlx5_destroy_flow_table(rx_fs->roce.ft_macsec_op_check);
+err_macsec_op:
+	mlx5_destroy_flow_table(rx_fs->roce.ft_ip_check);
+	return err;
 }
 
 static int macsec_fs_rx_create(struct mlx5_macsec_fs *macsec_fs)
···
 	rx_tables = &rx_fs->tables;
 	ft_crypto = &rx_tables->ft_crypto;
 
+	err = macsec_fs_rx_roce_create(macsec_fs);
+	if (err)
+		goto out_flow_group;
+
 	/* Rx crypto table */
 	ft_attr.level = RX_CRYPTO_TABLE_LEVEL;
 	ft_attr.max_fte = CRYPTO_NUM_MAXSEC_FTE;
···
 	if (IS_ERR(flow_table)) {
 		err = PTR_ERR(flow_table);
 		mlx5_core_err(mdev, "Failed to create MACsec Rx crypto table err(%d)\n", err);
-		goto out_flow_group;
+		goto err;
 	}
 	ft_crypto->t = flow_table;