TCP flow classification using 4-tuple and flags

-----Original Message-----
From: Sowmini Varadhan <[email protected]>
Sent: Wednesday, August 18, 2021 4:01 PM
To: [email protected]; Iremonger, Bernard <[email protected]>; [email protected]; [email protected]
Cc: [email protected]
Subject: [PATCH v2 1/2] examples/flow_classify: hooks for filters on tcp flags

v2 fixes: typo fixes, get_tcp_flags returns -EINVAL

The rte_eth_ntuple_filter allows tcp_flags which can check for things like

    #define RTE_TCP_CWR_FLAG 0x80 /**< Congestion Window Reduced */
    #define RTE_TCP_ECE_FLAG 0x40 /**< ECN-Echo */
    #define RTE_TCP_URG_FLAG 0x20 /**< Urgent Pointer field significant */
    #define RTE_TCP_ACK_FLAG 0x10 /**< Acknowledgment field significant
*/
    #define RTE_TCP_PSH_FLAG 0x08 /**< Push Function */
    #define RTE_TCP_RST_FLAG 0x04 /**< Reset the connection */
    #define RTE_TCP_SYN_FLAG 0x02 /**< Synchronize sequence numbers */
    #define RTE_TCP_FIN_FLAG 0x01 /**< No more data from sender */ but

there are no existing examples that demonstrate how to use this feature.

This patch extends the existing classification support to allow an optional flags in the input file. The flags string can be any concatenation of characters from {C, E, U, A, P, R, S, F} and "*" indicates "don't care". These flags are set in the ntuple_filter and are used to construct the tcp_spec and tcp_mask sent to the driver

The rte_acl_field_def is updated to use the (u8) tcp flag as lookup key. Note that, as per
https://doc.dpdk.org/guides/prog_guide/packet_classif_access_ctrl.html
this field MUST be allocated for 4 bytes, thus it has sizeof(uint32_t).

However, also note the XXX in this commit: additional updates are needed to the rte_flow_classify_table_entry_add() so that it does not ignore any key fields other than the 5-tuple.

Signed-off-by Sowmini Varadhan <[email protected]>

---

 examples/flow_classify/flow_classify.c     | 87 ++++++++++++++++++++--
 examples/flow_classify/ipv4_rules_file.txt | 22 +++---
 2 files changed, 91 insertions(+), 18 deletions(-)

examples/flow_classify/flow_classify.c +1 -0

index db71f5aa04..ff4c8bc2f5 100644
@@ -51,6 +51,7 @@ enum {
 	CB_FLD_DST_PORT_MASK,
 	CB_FLD_PROTO,
 	CB_FLD_PRIORITY,
+	CB_FLD_TCP_FLAGS,
 	CB_FLD_NUM,
 };
 

examples/flow_classify/flow_classify.c +20 -6

 };
 
 static struct rte_acl_field_def ipv4_defs[NUM_FIELDS_IPV4] = { @@ -150,6
+153,17 @@ static struct rte_acl_field_def ipv4_defs[NUM_FIELDS_IPV4] = {
 			sizeof(struct rte_ipv4_hdr) +
 			offsetof(struct rte_tcp_hdr, dst_port),
 	},
+	/* next field must be 4 bytes, even though flags is only 1 byte */
+	{
+		/* rte_flags */
+		.type = RTE_ACL_FIELD_TYPE_BITMASK,
+		.size = sizeof(uint32_t),
+		.field_index = TCP_FLAGS_FIELD,
+		.input_index = TCP_FLAGS_INDEX,
+		.offset = sizeof(struct rte_ether_hdr) +
+			sizeof(struct rte_ipv4_hdr) +
+			offsetof(struct rte_tcp_hdr, tcp_flags),
+	},
 };
 /* >8 End of creation of ACL table. */

@@ -285,12 +299,14 @@ lcore_main(struct flow_classifier *cls_app)
 	int ret;
 	int i = 0;
 
-	ret = rte_flow_classify_table_entry_delete(cls_app->cls,
-			rules[7]);
-	if (ret)
-		printf("table_entry_delete failed [7] %d\n\n", ret);
-	else
-		printf("table_entry_delete succeeded [7]\n\n");
+	if (rules[7]) {
+		ret = rte_flow_classify_table_entry_delete(cls_app->cls,
+				rules[7]);
+		if (ret)
+			printf("table_entry_delete failed [7] %d\n\n", ret);
+		else
+			printf("table_entry_delete succeeded [7]\n\n");
+	}
 
 	/*
 	 * Check that the port is on the same NUMA node as the polling

thread @@ -410,6 +426,53 @@ parse_ipv4_net(char *in, uint32_t *addr, uint32_t *mask_len)

examples/flow_classify/flow_classify.c +46 -0

 	return 0;
 }
 
+static int
+get_tcp_flags(char *in, struct rte_eth_ntuple_filter *ntuple_filter) {
+	int len = strlen(in);
+	int i;
+	uint8_t flags = 0;
+
+	if (strcmp(in, "*") == 0) {
+		ntuple_filter->tcp_flags = 0;
+		return 0;
+	}
+
+	for (i = 0; i < len; i++) {
+		switch (in[i]) {
+		case 'S':
+			flags |= RTE_TCP_SYN_FLAG;
+			break;
+		case 'F':
+			flags |= RTE_TCP_FIN_FLAG;
+			break;
+		case 'R':
+			flags |= RTE_TCP_RST_FLAG;
+			break;
+		case 'P':
+			flags |= RTE_TCP_PSH_FLAG;
+			break;
+		case 'A':
+			flags |= RTE_TCP_ACK_FLAG;
+			break;
+		case 'U':
+			flags |= RTE_TCP_URG_FLAG;
+			break;
+		case 'E':
+			flags |= RTE_TCP_ECE_FLAG;
+			break;
+		case 'C':
+			flags |= RTE_TCP_CWR_FLAG;
+			break;
+		default:
+			fprintf(stderr, "unknown flag %c\n", in[i]);
+			return -EINVAL;
+		}
+	}
+	ntuple_filter->tcp_flags = flags;
+	return 0;
+}
+
 static int
 parse_ipv4_5tuple_rule(char *str, struct rte_eth_ntuple_filter

*ntuple_filter) { @@ -481,6 +544,8 @@ parse_ipv4_5tuple_rule(char *str, struct rte_eth_ntuple_filter *ntuple_filter)

examples/flow_classify/flow_classify.c +5 -0

 	ntuple_filter->priority = (uint16_t)temp;
 	if (ntuple_filter->priority > FLOW_CLASSIFY_MAX_PRIORITY)
 		ret = -EINVAL;
+	if (get_tcp_flags(in[CB_FLD_TCP_FLAGS], ntuple_filter))
+		return -EINVAL;
 
 	return ret;
 }

@@ -597,10 +662,13 @@ add_classify_rule(struct rte_eth_ntuple_filter
 *ntuple_filter,
 		memset(&tcp_spec, 0, sizeof(tcp_spec));
 		tcp_spec.hdr.src_port = ntuple_filter->src_port;
 		tcp_spec.hdr.dst_port = ntuple_filter->dst_port;
+		tcp_spec.hdr.tcp_flags = ntuple_filter->tcp_flags;
 
 		memset(&tcp_mask, 0, sizeof(tcp_mask));
 		tcp_mask.hdr.src_port = ntuple_filter->src_port_mask;
 		tcp_mask.hdr.dst_port = ntuple_filter->dst_port_mask;
+		if (tcp_spec.hdr.tcp_flags != 0)
+			tcp_mask.hdr.tcp_flags = 0xff;
 
 		tcp_item.type = RTE_FLOW_ITEM_TYPE_TCP;

examples/flow_classify/flow_classify.c +5 -0

 		tcp_item.spec = &tcp_spec;

@@ -655,6 +723,11 @@ add_classify_rule(struct rte_eth_ntuple_filter
 *ntuple_filter,
 		return ret;
 	}
 
+	/* XXX but this only adds table_type of
+	 * RTE_FLOW_CLASSIFY_TABLE_ACL_IP4_5TUPLE
+	 * i.e., it only ever does allocate_acl_ipv4_5tuple_rule()
+	 * so the tcp_flags is ignored!
+	 */
 	rule = rte_flow_classify_table_entry_add(
 			cls_app->cls, &attr, pattern_ipv4_5tuple,

examples/flow_classify/flow_classify.c +0 -0

 			actions, &key_found, &error);

examples/flow_classify/ipv4_rules_file.txt +0 -1

index dfa0631fcc..415573732a 100644
@@ -1,14 +1,14 @@
 #file format:
-#src_ip/masklen dst_ip/masklen src_port : mask dst_port : mask

proto/mask priority

examples/flow_classify/ipv4_rules_file.txt +11 -10

+#src_ip/masklen dst_ip/masklen src_port : mask dst_port : mask
+proto/mask priority tcp_flags
 #
-2.2.2.3/24 2.2.2.7/24 32 : 0xffff 33 : 0xffff 17/0xff 0
-9.9.9.3/24 9.9.9.7/24 32 : 0xffff 33 : 0xffff 17/0xff 1
-9.9.9.3/24 9.9.9.7/24 32 : 0xffff 33 : 0xffff 6/0xff 2
-9.9.8.3/24 9.9.8.7/24 32 : 0xffff 33 : 0xffff 6/0xff 3
-6.7.8.9/24 2.3.4.5/24 32 : 0x0000 33 : 0x0000 132/0xff 4
-6.7.8.9/32 192.168.0.36/32 10 : 0xffff 11 : 0xffff 6/0xfe 5
-6.7.8.9/24 192.168.0.36/24 10 : 0xffff 11 : 0xffff 6/0xfe 6
-6.7.8.9/16 192.168.0.36/16 10 : 0xffff 11 : 0xffff 6/0xfe 7
-6.7.8.9/8 192.168.0.36/8 10 : 0xffff 11 : 0xffff 6/0xfe 8
+2.2.2.3/24 2.2.2.7/24 32 : 0xffff 33 : 0xffff 17/0xff 0 *
+9.9.9.3/24 9.9.9.7/24 32 : 0xffff 33 : 0xffff 17/0xff 1 *
+9.9.9.3/24 9.9.9.7/24 32 : 0xffff 33 : 0xffff 6/0xff 2 *
+9.9.8.3/24 9.9.8.7/24 32 : 0xffff 33 : 0xffff 6/0xff 3 *
+6.7.8.9/24 2.3.4.5/24 32 : 0x0000 33 : 0x0000 132/0xff 4 *
+6.7.8.9/32 192.168.0.36/32 10 : 0xffff 11 : 0xffff 6/0xfe 5 *
+6.7.8.9/24 192.168.0.36/24 10 : 0xffff 11 : 0xffff 6/0xfe 6 *
+6.7.8.9/16 192.168.0.36/16 10 : 0xffff 11 : 0xffff 6/0xfe 7 *
+6.7.8.9/8 192.168.0.36/8 10 : 0xffff 11 : 0xffff 6/0xfe 8 *
 #error rules
-#9.8.7.6/8 192.168.0.36/8 10 : 0xffff 11 : 0xffff 6/0xfe 9 \ No newline at end

of file
+#9.8.7.6/8 192.168.0.36/8 10 : 0xffff 11 : 0xffff 6/0xfe 9 * --
2.17.1

-----Original Message-----
From: Sowmini Varadhan <[email protected]>
Sent: Wednesday, August 18, 2021 4:01 PM
To: [email protected]; Iremonger, Bernard <[email protected]>; [email protected]; [email protected]
Cc: [email protected]
Subject: [PATCH v2 2/2] examples/flow_classify: add an ACL table for tcp

v2 updates: typo fixes for checkpatch, bernard.iremonger comments

The struct rte_flow_classifier can have up to RTE_FLOW_CLASSIFY_TABLE_MAX
(32) classifier tables, but the existing flow_classify examples only adds a single table for the L4 5-tuple.

When dealing with tcp flows, we frequently want to add ACLs and filters to filter based on the state of the TCP connection, e.g., by looking at the tcp flags field.

So we enhance flow_classify to add an additional acl table for tcp 5-tuples. If the input-file-parser detects a filter for a tcp flow with a non-wildcard argument for tcp_flags, the IP4_TCP_5TUPLE table is used by flow_classify.

Signed-off-by Sowmini Varadhan <[email protected]>

---

 examples/flow_classify/flow_classify.c      | 41 +++++++---
 lib/flow_classify/rte_flow_classify.c       | 87 +++++++++++++++++++++
 lib/flow_classify/rte_flow_classify.h       | 19 +++++
 lib/flow_classify/rte_flow_classify_parse.c |  8 +-
 4 files changed, 142 insertions(+), 13 deletions(-)

examples/flow_classify/flow_classify.c +0 -5

index ff4c8bc2f5..8f6aacae03 100644
@@ -723,11 +723,6 @@ add_classify_rule(struct rte_eth_ntuple_filter
 *ntuple_filter,
 		return ret;
 	}
 
-	/* XXX but this only adds table_type of
-	 * RTE_FLOW_CLASSIFY_TABLE_ACL_IP4_5TUPLE
-	 * i.e., it only ever does allocate_acl_ipv4_5tuple_rule()
-	 * so the tcp_flags is ignored!
-	 */
 	rule = rte_flow_classify_table_entry_add(
 			cls_app->cls, &attr, pattern_ipv4_5tuple,

examples/flow_classify/flow_classify.c +28 -6

 			actions, &key_found, &error);

@@ -856,7 +851,8 @@ main(int argc, char *argv[])
 	int ret;
 	int socket_id;
 	struct rte_table_acl_params table_acl_params;
-	struct rte_flow_classify_table_params cls_table_params;
+	struct rte_table_acl_params table_acl_tcp_params;
+	struct rte_flow_classify_table_params cls_table_params[2];
 	struct flow_classifier *cls_app;
 	struct rte_flow_classifier_params cls_params;
 	uint32_t size;

@@ -923,21 +919,42 @@ main(int argc, char *argv[])
 	memcpy(table_acl_params.field_format, ipv4_defs,
 sizeof(ipv4_defs));
 
 	/* initialise table create params */
-	cls_table_params.ops = &rte_table_acl_ops;
-	cls_table_params.arg_create = &table_acl_params;
-	cls_table_params.type =
 RTE_FLOW_CLASSIFY_TABLE_ACL_IP4_5TUPLE;
+	cls_table_params[0].ops = &rte_table_acl_ops;
+	cls_table_params[0].arg_create = &table_acl_params;
+	cls_table_params[0].type =
 RTE_FLOW_CLASSIFY_TABLE_ACL_IP4_5TUPLE;
+
+	/* initialise ACL table params */
+	table_acl_tcp_params.name = "table_acl_ipv4_tcp_5tuple";
+	table_acl_tcp_params.n_rules = FLOW_CLASSIFY_MAX_RULE_NUM;
+	table_acl_tcp_params.n_rule_fields = RTE_DIM(ipv4_defs);
+	memcpy(table_acl_tcp_params.field_format, ipv4_defs,
+sizeof(ipv4_defs));
+
+	/* initialise table create params */
+	cls_table_params[1].ops = &rte_table_acl_ops;
+	cls_table_params[1].arg_create = &table_acl_tcp_params;
+	cls_table_params[1].type =
 RTE_FLOW_CLASSIFY_TABLE_ACL_IP4_TCP_5TUPLE;
 
-	ret = rte_flow_classify_table_create(cls_app->cls,
 &cls_table_params);
+	ret = rte_flow_classify_table_create(cls_app->cls,
+					     &cls_table_params[0]);
 	if (ret) {
 		rte_flow_classifier_free(cls_app->cls);
 		rte_free(cls_app);
 		rte_exit(EXIT_FAILURE, "Failed to create classifier table\n");
 	}
+	ret = rte_flow_classify_table_create(cls_app->cls,
+					     &cls_table_params[1]);
+	if (ret) {
+		rte_flow_classifier_free(cls_app->cls);
+		rte_free(cls_app);
+		rte_exit(EXIT_FAILURE,
+			 "Failed to create classifier table\n");
+	}
+
 	/* >8 End of initialization of table create params. */
 
 	/* read file of IPv4 5 tuple rules and initialize parameters
-	 * for rte_flow_classify_validate and

rte_flow_classify_table_entry_add

examples/flow_classify/flow_classify.c +2 -1

-	 * API's.
+	 * for rte_flow_classify_validate and
+	 * rte_flow_classify_table_entry_add  API's.
 	 */
 
 	/* Read file of IPv4 tuple rules. 8< */ diff --git

a/lib/flow_classify/rte_flow_classify.c b/lib/flow_classify/rte_flow_classify.c index d3ba2ed227..e960c3b140 100644

lib/flow_classify/rte_flow_classify.c +17 -0

 	NUM_FIELDS_IPV4
 };
 

@@ -72,6 +73,7 @@ struct classify_rules {
 	enum rte_flow_classify_rule_type type;
 	union {
 		struct rte_flow_classify_ipv4_5tuple ipv4_5tuple;
+		struct rte_flow_classify_ipv4_tcp_5tuple ipv4_tcp_5tuple;
 	} u;
 };
 

@@ -477,6 +479,84 @@ allocate_acl_ipv4_5tuple_rule(struct
 rte_flow_classifier *cls)
 	return rule;
 }
 
+static struct rte_flow_classify_rule *
+allocate_acl_ipv4_tcp_5tuple_rule(struct rte_flow_classifier *cls) {
+	struct rte_flow_classify_rule *rule;
+	int log_level;
+
+	rule = malloc(sizeof(struct rte_flow_classify_rule));
+	if (!rule)
+		return rule;
+
+	memset(rule, 0, sizeof(struct rte_flow_classify_rule));
+	rule->id = unique_id++;
+	rule->rules.type =
 RTE_FLOW_CLASSIFY_RULE_TYPE_IPV4_TCP_5TUPLE;
+
+	/* key add values */
+	rule->u.key.key_add.priority = cls->ntuple_filter.priority;
+	rule-

Quoted 1 line

u.key.key_add.field_value[PROTO_FIELD_IPV4].mask_range.u8 =

lib/flow_classify/rte_flow_classify.c +8 -0

+			cls->ntuple_filter.proto_mask;
+	rule->u.key.key_add.field_value[PROTO_FIELD_IPV4].value.u8 =
+			cls->ntuple_filter.proto;
+	rule->rules.u.ipv4_tcp_5tuple.proto = cls->ntuple_filter.proto;
+	rule->rules.u.ipv4_tcp_5tuple.proto_mask =
+			cls->ntuple_filter.proto_mask;
+
+	rule->u.key.key_add.field_value[SRC_FIELD_IPV4].mask_range.u32

=

lib/flow_classify/rte_flow_classify.c +8 -0

+			cls->ntuple_filter.src_ip_mask;
+	rule->u.key.key_add.field_value[SRC_FIELD_IPV4].value.u32 =
+			cls->ntuple_filter.src_ip;
+	rule->rules.u.ipv4_tcp_5tuple.src_ip_mask =
+			cls->ntuple_filter.src_ip_mask;
+	rule->rules.u.ipv4_tcp_5tuple.src_ip = cls->ntuple_filter.src_ip;
+
+	rule->u.key.key_add.field_value[DST_FIELD_IPV4].mask_range.u32

=

lib/flow_classify/rte_flow_classify.c +8 -0

+			cls->ntuple_filter.dst_ip_mask;
+	rule->u.key.key_add.field_value[DST_FIELD_IPV4].value.u32 =
+			cls->ntuple_filter.dst_ip;
+	rule->rules.u.ipv4_tcp_5tuple.dst_ip_mask =
+			cls->ntuple_filter.dst_ip_mask;
+	rule->rules.u.ipv4_tcp_5tuple.dst_ip = cls->ntuple_filter.dst_ip;
+
+	rule-

Quoted 1 line

u.key.key_add.field_value[SRCP_FIELD_IPV4].mask_range.u16 =

lib/flow_classify/rte_flow_classify.c +8 -0

+			cls->ntuple_filter.src_port_mask;
+	rule->u.key.key_add.field_value[SRCP_FIELD_IPV4].value.u16 =
+			cls->ntuple_filter.src_port;
+	rule->rules.u.ipv4_tcp_5tuple.src_port_mask =
+			cls->ntuple_filter.src_port_mask;
+	rule->rules.u.ipv4_tcp_5tuple.src_port = cls->ntuple_filter.src_port;
+
+	rule-

Quoted 1 line

u.key.key_add.field_value[DSTP_FIELD_IPV4].mask_range.u16 =

lib/flow_classify/rte_flow_classify.c +8 -0

+			cls->ntuple_filter.dst_port_mask;
+	rule->u.key.key_add.field_value[DSTP_FIELD_IPV4].value.u16 =
+			cls->ntuple_filter.dst_port;
+	rule->rules.u.ipv4_tcp_5tuple.dst_port_mask =
+			cls->ntuple_filter.dst_port_mask;
+	rule->rules.u.ipv4_tcp_5tuple.dst_port = cls->ntuple_filter.dst_port;
+
+	rule-

Quoted 1 line

u.key.key_add.field_value[TCP_FLAGS_FIELD].mask_range.u32 =

lib/flow_classify/rte_flow_classify.c +29 -0

+			rte_be_to_cpu_32(0xff);
+	rule->u.key.key_add.field_value[TCP_FLAGS_FIELD].value.u32 =
+			rte_be_to_cpu_32(cls->ntuple_filter.tcp_flags);
+	rule->rules.u.ipv4_tcp_5tuple.tcp_flags =
+cls->ntuple_filter.tcp_flags;
+
+	log_level = rte_log_get_level(librte_flow_classify_logtype);
+
+	if (log_level == RTE_LOG_DEBUG)
+		print_acl_ipv4_key_add(&rule->u.key.key_add);
+
+	/* key delete values */
+	memcpy(&rule->u.key.key_del.field_value[PROTO_FIELD_IPV4],
+	       &rule->u.key.key_add.field_value[PROTO_FIELD_IPV4],
+	       NUM_FIELDS_IPV4 * sizeof(struct rte_acl_field));
+
+	if (log_level == RTE_LOG_DEBUG)
+		print_acl_ipv4_key_delete(&rule->u.key.key_del);
+
+	return rule;
+}
+
 struct rte_flow_classify_rule *
 rte_flow_classify_table_entry_add(struct rte_flow_classifier *cls,
 		const struct rte_flow_attr *attr,

@@ -514,6 +594,13 @@ rte_flow_classify_table_entry_add(struct
 rte_flow_classifier *cls,
 		rule->tbl_type = table_type;
 		cls->table_mask |= table_type;
 		break;
+	case RTE_FLOW_CLASSIFY_TABLE_ACL_IP4_TCP_5TUPLE:
+		rule = allocate_acl_ipv4_tcp_5tuple_rule(cls);
+		if (!rule)
+			return NULL;
+		rule->tbl_type = table_type;
+		cls->table_mask |= table_type;
+		break;
 	default:
 		return NULL;

lib/flow_classify/rte_flow_classify.c +0 -0

 	}

lib/flow_classify/rte_flow_classify.h +19 -0

index 82ea92b6a6..65585d9f92 100644
@@ -80,6 +80,8 @@ enum rte_flow_classify_rule_type {
 	RTE_FLOW_CLASSIFY_RULE_TYPE_NONE,
 	/** IPv4 5tuple type */
 	RTE_FLOW_CLASSIFY_RULE_TYPE_IPV4_5TUPLE,
+	/** IPv4 TCP 5tuple type */
+	RTE_FLOW_CLASSIFY_RULE_TYPE_IPV4_TCP_5TUPLE,
 };
 
 /** Flow classify table type */

@@ -92,6 +94,8 @@ enum rte_flow_classify_table_type {
 	RTE_FLOW_CLASSIFY_TABLE_ACL_VLAN_IP4_5TUPLE = 1 << 2,
 	/** ACL QinQ IP4 5TUPLE */
 	RTE_FLOW_CLASSIFY_TABLE_ACL_QINQ_IP4_5TUPLE = 1 << 3,
+	/** ACL IP4 5TUPLE with tcp_flags */
+	RTE_FLOW_CLASSIFY_TABLE_ACL_IP4_TCP_5TUPLE = 1 << 4,
 
 };
 

@@ -131,6 +135,21 @@ struct rte_flow_classify_ipv4_5tuple {
 	uint8_t proto_mask;      /**< Mask of L4 protocol. */
 };
 
+/** IPv4 5-tuple data with tcp flags*/
+struct rte_flow_classify_ipv4_tcp_5tuple {
+	uint32_t dst_ip;         /**< Destination IP address in big endian. */
+	uint32_t dst_ip_mask;    /**< Mask of destination IP address. */
+	uint32_t src_ip;         /**< Source IP address in big endian. */
+	uint32_t src_ip_mask;    /**< Mask of destination IP address. */
+	uint16_t dst_port;       /**< Destination port in big endian. */
+	uint16_t dst_port_mask;  /**< Mask of destination port. */
+	uint16_t src_port;       /**< Source Port in big endian. */
+	uint16_t src_port_mask;  /**< Mask of source port. */
+	uint8_t proto;           /**< L4 protocol. */
+	uint8_t proto_mask;      /**< Mask of L4 protocol. */
+	uint8_t tcp_flags;       /**< Tcp only */
+};
+
 /**
  * Flow stats
  *

lib/flow_classify/rte_flow_classify_parse.c +1 -0

index 465330291f..fe4ee05b6f 100644
@@ -216,6 +216,7 @@ classify_parse_ntuple_filter(const struct
 rte_flow_attr *attr,
 	const struct rte_flow_action_count *count;
 	const struct rte_flow_action_mark *mark_spec;
 	uint32_t index;
+	bool have_tcp = false;
 
 	/* parse pattern */

lib/flow_classify/rte_flow_classify_parse.c +6 -1

 	index = 0;

@@ -375,6 +376,8 @@ classify_parse_ntuple_filter(const struct
 rte_flow_attr *attr,
 		filter->dst_port  = tcp_spec->hdr.dst_port;
 		filter->src_port  = tcp_spec->hdr.src_port;
 		filter->tcp_flags = tcp_spec->hdr.tcp_flags;
+		if (filter->tcp_flags != 0)
+			have_tcp = true;
 	} else if (item->type == RTE_FLOW_ITEM_TYPE_UDP) {
 		udp_mask = item->mask;

@@ -434,7 +437,10 @@ classify_parse_ntuple_filter(const struct
 rte_flow_attr *attr,
 		return -EINVAL;
 	}
 
-	table_type = RTE_FLOW_CLASSIFY_TABLE_ACL_IP4_5TUPLE;
+	if (have_tcp)
+		table_type =
 RTE_FLOW_CLASSIFY_TABLE_ACL_IP4_TCP_5TUPLE;
+	else
+		table_type = RTE_FLOW_CLASSIFY_TABLE_ACL_IP4_5TUPLE;
 

lib/flow_classify/rte_flow_classify_parse.c +0 -1

 	/* parse attr */
 	/* must be input direction */
--

2.17.1

Quoted 1 line

v2 updates: typo fixes for checkpatch, bernard.iremonger comments

The above line should not be added to the commit message. ~/dpdk/devtools/check-git-log.sh -1
Wrong tag:
v2 fixes: typo fixes, get_tcp_flags returns -EINVAL

The check-git-log.sh script is in your dpdk checkout, best to run this script before sending patches

-----Original Message-----
From: Sowmini Varadhan <[email protected]>
Sent: Thursday, August 19, 2021 4:21 PM
To: Iremonger, Bernard <[email protected]>
Cc: [email protected]; [email protected]; [email protected]
Subject: Re: [PATCH v2 2/2] examples/flow_classify: add an ACL table for tcp

Quoted 8 lines · Bernard

Quoted 1 line

v2 updates: typo fixes for checkpatch, bernard.iremonger comments

The above line should not be added to the commit message. ~/dpdk/devtools/check-git-log.sh -1
Wrong tag:
v2 fixes: typo fixes, get_tcp_flags returns -EINVAL

The check-git-log.sh script is in your dpdk checkout, best to run this script

before sending patches

apologies, I was not aware of this, I will fix and send out v3. I did run check-git-log.sh but before editing the vX updates.

thanks for your patience.

--Sowmini

Looking closer at this patchset, I am not sure that a second ACL table is needed. The existing ACL table handles UDP, TCP and SCP, however it is not processing the TCP flags. I think it just needs to be modified to process the TCP flags.
Could you take another look to see if the above proposed solution will work for you.

Quoted 5 lines · Bernard

Looking closer at this patchset, I am not sure that a second ACL table is needed. The existing ACL table handles UDP, TCP and SCP, however it is not processing the TCP flags. I think it just needs to be modified to process the TCP flags.
Could you take another look to see if the above proposed solution will work for you.

I'm not sure it would. As I pointed out in the original rfc at
https://inbox.dpdk.org/dev/[email protected]/

we need to add a key for the 8 bit flags, but the multibit trie lookup moves in steps of 4 bytes.

However, it has admittedly been a while since I tinkereed with this, and I can give it a shot and get back.

Thanks
--Sowmini