diff mbox series

[V4] pipeline: support default action arguments

Message ID 20220411182108.5752-1-cristian.dumitrescu@intel.com (mailing list archive)
State Accepted
Delegated to: Thomas Monjalon
Headers show
Series [V4] pipeline: support default action arguments | expand

Checks

Context Check Description
ci/iol-intel-Performance success Performance Testing PASS
ci/iol-intel-Functional success Functional Testing PASS
ci/iol-mellanox-Performance success Performance Testing PASS
ci/iol-x86_64-unit-testing success Testing PASS
ci/iol-x86_64-compile-testing success Testing PASS
ci/iol-abi-testing success Testing PASS
ci/iol-aarch64-compile-testing success Testing PASS
ci/iol-aarch64-unit-testing success Testing PASS
ci/intel-Testing success Testing PASS
ci/Intel-compilation success Compilation OK
ci/checkpatch success coding style OK

Commit Message

Dumitrescu, Cristian April 11, 2022, 6:21 p.m. UTC
Add support for arguments to the default action of regular and learner
tables at initialization time. Until now, only default actions with no
arguments were accepted in the .spec file.

Signed-off-by: Cristian Dumitrescu <cristian.dumitrescu@intel.com>
Signed-off-by: Yogesh Jangra <yogesh.jangra@intel.com>
---
 lib/pipeline/rte_swx_pipeline.c      | 237 +++++++++++++++++-----
 lib/pipeline/rte_swx_pipeline.h      |  18 +-
 lib/pipeline/rte_swx_pipeline_spec.c | 293 +++++++++++++++++++--------
 3 files changed, 405 insertions(+), 143 deletions(-)

Comments

Thomas Monjalon June 1, 2022, 12:01 p.m. UTC | #1
11/04/2022 20:21, Cristian Dumitrescu:
> Add support for arguments to the default action of regular and learner
> tables at initialization time. Until now, only default actions with no
> arguments were accepted in the .spec file.
> 
> Signed-off-by: Cristian Dumitrescu <cristian.dumitrescu@intel.com>
> Signed-off-by: Yogesh Jangra <yogesh.jangra@intel.com>

Applied, thanks.
diff mbox series

Patch

diff --git a/lib/pipeline/rte_swx_pipeline.c b/lib/pipeline/rte_swx_pipeline.c
index 17da11c015..dfbac929c7 100644
--- a/lib/pipeline/rte_swx_pipeline.c
+++ b/lib/pipeline/rte_swx_pipeline.c
@@ -7209,8 +7209,8 @@  rte_swx_pipeline_action_config(struct rte_swx_pipeline *p,
 			       uint32_t n_instructions)
 {
 	struct struct_type *args_struct_type = NULL;
-	struct action *a;
-	int err;
+	struct action *a = NULL;
+	int status = 0;
 
 	CHECK(p, EINVAL);
 
@@ -7226,12 +7226,16 @@  rte_swx_pipeline_action_config(struct rte_swx_pipeline *p,
 
 	/* Node allocation. */
 	a = calloc(1, sizeof(struct action));
-	CHECK(a, ENOMEM);
+	if (!a) {
+		status = -ENOMEM;
+		goto error;
+	}
+
 	if (args_struct_type) {
 		a->args_endianness = calloc(args_struct_type->n_fields, sizeof(int));
 		if (!a->args_endianness) {
-			free(a);
-			CHECK(0, ENOMEM);
+			status = -ENOMEM;
+			goto error;
 		}
 	}
 
@@ -7241,18 +7245,26 @@  rte_swx_pipeline_action_config(struct rte_swx_pipeline *p,
 	a->id = p->n_actions;
 
 	/* Instruction translation. */
-	err = instruction_config(p, a, instructions, n_instructions);
-	if (err) {
-		free(a->args_endianness);
-		free(a);
-		return err;
-	}
+	status = instruction_config(p, a, instructions, n_instructions);
+	if (status)
+		goto error;
 
 	/* Node add to tailq. */
 	TAILQ_INSERT_TAIL(&p->actions, a, node);
 	p->n_actions++;
 
 	return 0;
+
+error:
+	if (!a)
+		return status;
+
+	free(a->args_endianness);
+	free(a->instructions);
+	free(a->instruction_data);
+	free(a);
+
+	return status;
 }
 
 static int
@@ -7297,8 +7309,9 @@  action_free(struct rte_swx_pipeline *p)
 			break;
 
 		TAILQ_REMOVE(&p->actions, action, node);
-		free(action->instruction_data);
+		free(action->args_endianness);
 		free(action->instructions);
+		free(action->instruction_data);
 		free(action);
 	}
 }
@@ -7337,6 +7350,91 @@  action_arg_src_mov_count(struct action *a,
 	return n_users;
 }
 
+#if RTE_BYTE_ORDER == RTE_LITTLE_ENDIAN
+#define field_ntoh(val, n_bits) (ntoh64((val) << (64 - n_bits)))
+#define field_hton(val, n_bits) (hton64((val) << (64 - n_bits)))
+#else
+#define field_ntoh(val, n_bits) (val)
+#define field_hton(val, n_bits) (val)
+#endif
+
+#define ACTION_ARGS_TOKENS_MAX 256
+
+static int
+action_args_parse(struct action *a, const char *args, uint8_t *data)
+{
+	char *tokens[ACTION_ARGS_TOKENS_MAX], *s0 = NULL, *s;
+	uint32_t n_tokens = 0, offset = 0, i;
+	int status = 0;
+
+	/* Checks. */
+	if (!a->st || !args || !args[0]) {
+		status = -EINVAL;
+		goto error;
+	}
+
+	/* Memory allocation. */
+	s0 = strdup(args);
+	if (!s0) {
+		status = -ENOMEM;
+		goto error;
+	}
+
+	/* Parse the string into tokens. */
+	for (s = s0; ; ) {
+		char *token;
+
+		token = strtok_r(s, " \f\n\r\t\v", &s);
+		if (!token)
+			break;
+
+		if (n_tokens >= RTE_DIM(tokens)) {
+			status = -EINVAL;
+			goto error;
+		}
+
+		tokens[n_tokens] = token;
+		n_tokens++;
+	}
+
+	/* More checks. */
+	if (n_tokens != a->st->n_fields * 2) {
+		status = -EINVAL;
+		goto error;
+	}
+
+	/* Process the action arguments. */
+	for (i = 0; i < a->st->n_fields; i++) {
+		struct field *f = &a->st->fields[i];
+		char *arg_name = tokens[i * 2];
+		char *arg_val = tokens[i * 2 + 1];
+		uint64_t val;
+
+		if (strcmp(arg_name, f->name)) {
+			status = -EINVAL;
+			goto error;
+		}
+
+		val = strtoull(arg_val, &arg_val, 0);
+		if (arg_val[0]) {
+			status = -EINVAL;
+			goto error;
+		}
+
+		/* Endianness conversion. */
+		if (a->args_endianness[i])
+			val = field_hton(val, f->n_bits);
+
+		/* Copy to entry. */
+		memcpy(&data[offset], (uint8_t *)&val, f->n_bits / 8);
+		offset += f->n_bits / 8;
+	}
+
+error:
+	free(s0);
+	return status;
+}
+
 /*
  * Table.
  */
@@ -7609,8 +7707,8 @@  rte_swx_pipeline_table_config(struct rte_swx_pipeline *p,
 	      EINVAL);
 
 	default_action = action_find(p, params->default_action_name);
-	CHECK((default_action->st && params->default_action_data) ||
-	      !params->default_action_data, EINVAL);
+	CHECK((default_action->st && params->default_action_args) || !params->default_action_args,
+	      EINVAL);
 
 	/* Table type checks. */
 	if (recommended_table_type_name)
@@ -7631,30 +7729,42 @@  rte_swx_pipeline_table_config(struct rte_swx_pipeline *p,
 
 	/* Memory allocation. */
 	t = calloc(1, sizeof(struct table));
-	if (!t)
-		goto nomem;
+	if (!t) {
+		status = -ENOMEM;
+		goto error;
+	}
 
 	t->fields = calloc(params->n_fields, sizeof(struct match_field));
-	if (!t->fields)
-		goto nomem;
+	if (!t->fields) {
+		status = -ENOMEM;
+		goto error;
+	}
 
 	t->actions = calloc(params->n_actions, sizeof(struct action *));
-	if (!t->actions)
-		goto nomem;
+	if (!t->actions) {
+		status = -ENOMEM;
+		goto error;
+	}
 
 	if (action_data_size_max) {
 		t->default_action_data = calloc(1, action_data_size_max);
-		if (!t->default_action_data)
-			goto nomem;
+		if (!t->default_action_data) {
+			status = -ENOMEM;
+			goto error;
+		}
 	}
 
 	t->action_is_for_table_entries = calloc(params->n_actions, sizeof(int));
-	if (!t->action_is_for_table_entries)
-		goto nomem;
+	if (!t->action_is_for_table_entries) {
+		status = -ENOMEM;
+		goto error;
+	}
 
 	t->action_is_for_default_entry = calloc(params->n_actions, sizeof(int));
-	if (!t->action_is_for_default_entry)
-		goto nomem;
+	if (!t->action_is_for_default_entry) {
+		status = -ENOMEM;
+		goto error;
+	}
 
 	/* Node initialization. */
 	strcpy(t->name, name);
@@ -7687,10 +7797,14 @@  rte_swx_pipeline_table_config(struct rte_swx_pipeline *p,
 		t->action_is_for_default_entry[i] = action_is_for_default_entry;
 	}
 	t->default_action = default_action;
-	if (default_action->st)
-		memcpy(t->default_action_data,
-		       params->default_action_data,
-		       default_action->st->n_bits / 8);
+	if (default_action->st) {
+		status = action_args_parse(default_action,
+					   params->default_action_args,
+					   t->default_action_data);
+		if (status)
+			goto error;
+	}
+
 	t->n_actions = params->n_actions;
 	t->default_action_is_const = params->default_action_is_const;
 	t->action_data_size_max = action_data_size_max;
@@ -7704,9 +7818,9 @@  rte_swx_pipeline_table_config(struct rte_swx_pipeline *p,
 
 	return 0;
 
-nomem:
+error:
 	if (!t)
-		return -ENOMEM;
+		return status;
 
 	free(t->action_is_for_default_entry);
 	free(t->action_is_for_table_entries);
@@ -7715,7 +7829,7 @@  rte_swx_pipeline_table_config(struct rte_swx_pipeline *p,
 	free(t->fields);
 	free(t);
 
-	return -ENOMEM;
+	return status;
 }
 
 static struct rte_swx_table_params *
@@ -8496,8 +8610,8 @@  rte_swx_pipeline_learner_config(struct rte_swx_pipeline *p,
 	      EINVAL);
 
 	default_action = action_find(p, params->default_action_name);
-	CHECK((default_action->st && params->default_action_data) ||
-	      !params->default_action_data, EINVAL);
+	CHECK((default_action->st && params->default_action_args) || !params->default_action_args,
+	      EINVAL);
 
 	/* Any other checks. */
 	CHECK(size, EINVAL);
@@ -8505,30 +8619,42 @@  rte_swx_pipeline_learner_config(struct rte_swx_pipeline *p,
 
 	/* Memory allocation. */
 	l = calloc(1, sizeof(struct learner));
-	if (!l)
-		goto nomem;
+	if (!l) {
+		status = -ENOMEM;
+		goto error;
+	}
 
 	l->fields = calloc(params->n_fields, sizeof(struct field *));
-	if (!l->fields)
-		goto nomem;
+	if (!l->fields) {
+		status = -ENOMEM;
+		goto error;
+	}
 
 	l->actions = calloc(params->n_actions, sizeof(struct action *));
-	if (!l->actions)
-		goto nomem;
+	if (!l->actions) {
+		status = -ENOMEM;
+		goto error;
+	}
 
 	if (action_data_size_max) {
 		l->default_action_data = calloc(1, action_data_size_max);
-		if (!l->default_action_data)
-			goto nomem;
+		if (!l->default_action_data) {
+			status = -ENOMEM;
+			goto error;
+		}
 	}
 
 	l->action_is_for_table_entries = calloc(params->n_actions, sizeof(int));
-	if (!l->action_is_for_table_entries)
-		goto nomem;
+	if (!l->action_is_for_table_entries) {
+		status = -ENOMEM;
+		goto error;
+	}
 
 	l->action_is_for_default_entry = calloc(params->n_actions, sizeof(int));
-	if (!l->action_is_for_default_entry)
-		goto nomem;
+	if (!l->action_is_for_default_entry) {
+		status = -ENOMEM;
+		goto error;
+	}
 
 	/* Node initialization. */
 	strcpy(l->name, name);
@@ -8560,10 +8686,13 @@  rte_swx_pipeline_learner_config(struct rte_swx_pipeline *p,
 
 	l->default_action = default_action;
 
-	if (default_action->st)
-		memcpy(l->default_action_data,
-		       params->default_action_data,
-		       default_action->st->n_bits / 8);
+	if (default_action->st) {
+		status = action_args_parse(default_action,
+					   params->default_action_args,
+					   l->default_action_data);
+		if (status)
+			goto error;
+	}
 
 	l->n_actions = params->n_actions;
 
@@ -8583,9 +8712,9 @@  rte_swx_pipeline_learner_config(struct rte_swx_pipeline *p,
 
 	return 0;
 
-nomem:
+error:
 	if (!l)
-		return -ENOMEM;
+		return status;
 
 	free(l->action_is_for_default_entry);
 	free(l->action_is_for_table_entries);
@@ -8594,7 +8723,7 @@  rte_swx_pipeline_learner_config(struct rte_swx_pipeline *p,
 	free(l->fields);
 	free(l);
 
-	return -ENOMEM;
+	return status;
 }
 
 static void
diff --git a/lib/pipeline/rte_swx_pipeline.h b/lib/pipeline/rte_swx_pipeline.h
index 1cfd1c542f..c95d0c7682 100644
--- a/lib/pipeline/rte_swx_pipeline.h
+++ b/lib/pipeline/rte_swx_pipeline.h
@@ -619,11 +619,12 @@  struct rte_swx_pipeline_table_params {
 	 */
 	const char *default_action_name;
 
-	/** Default action data. The size of this array is the action data size
-	 * of the default action. Must be NULL if the default action data size
-	 * is zero.
+	/** Default action arguments. Specified as a string with the format
+	 * "ARG0_NAME ARG0_VALUE ...". The number of arguments in this string
+	 * must match exactly the number of arguments of the default action.
+	 * Must be NULL if the default action does not have any arguments.
 	 */
-	uint8_t *default_action_data;
+	const char *default_action_args;
 
 	/** If non-zero (true), then the default action of the current table
 	 * cannot be changed. If zero (false), then the default action can be
@@ -758,11 +759,12 @@  struct rte_swx_pipeline_learner_params {
 	 */
 	const char *default_action_name;
 
-	/** Default action data. The size of this array is the action data size
-	 * of the default action. Must be NULL if the default action data size
-	 * is zero.
+	/** Default action arguments. Specified as a string with the format
+	 * "ARG0_NAME ARG0_VALUE ...". The number of arguments in this string
+	 * must match exactly the number of arguments of the default action.
+	 * Must be NULL if the default action does not have any arguments.
 	 */
-	uint8_t *default_action_data;
+	const char *default_action_args;
 
 	/** If non-zero (true), then the default action of the current table
 	 * cannot be changed. If zero (false), then the default action can be
diff --git a/lib/pipeline/rte_swx_pipeline_spec.c b/lib/pipeline/rte_swx_pipeline_spec.c
index 8165a046ea..b2f2469b18 100644
--- a/lib/pipeline/rte_swx_pipeline_spec.c
+++ b/lib/pipeline/rte_swx_pipeline_spec.c
@@ -7,10 +7,17 @@ 
 #include <string.h>
 #include <errno.h>
 
+#include <rte_common.h>
+
 #include "rte_swx_pipeline.h"
 
-#define MAX_LINE_LENGTH RTE_SWX_INSTRUCTION_SIZE
-#define MAX_TOKENS RTE_SWX_INSTRUCTION_TOKENS_MAX
+#ifndef MAX_LINE_LENGTH
+#define MAX_LINE_LENGTH 2048
+#endif
+
+#ifndef MAX_TOKENS
+#define MAX_TOKENS 256
+#endif
 
 #define STRUCT_BLOCK 0
 #define ACTION_BLOCK 1
@@ -532,7 +539,7 @@  action_block_parse(struct action_spec *s,
 /*
  * table.
  *
- * table {
+ * table TABLE_NAME {
  *	key {
  *		MATCH_FIELD_NAME exact | wildcard | lpm
  *		...
@@ -541,7 +548,7 @@  action_block_parse(struct action_spec *s,
  *		ACTION_NAME [ @tableonly | @defaultonly ]
  *		...
  *	}
- *	default_action ACTION_NAME args none | ARGS_BYTE_ARRAY [ const ]
+ *	default_action ACTION_NAME args none | ARG0_NAME ARG0_VALUE ... [ const ]
  *	instanceof TABLE_TYPE_NAME
  *	pragma ARGS
  *	size SIZE
@@ -558,7 +565,7 @@  struct table_spec {
 static void
 table_spec_free(struct table_spec *s)
 {
-	uintptr_t default_action_name;
+	uintptr_t default_action_name, default_action_args;
 	uint32_t i;
 
 	if (!s)
@@ -593,8 +600,9 @@  table_spec_free(struct table_spec *s)
 	free((void *)default_action_name);
 	s->params.default_action_name = NULL;
 
-	free(s->params.default_action_data);
-	s->params.default_action_data = NULL;
+	default_action_args = (uintptr_t)s->params.default_action_args;
+	free((void *)default_action_args);
+	s->params.default_action_args = NULL;
 
 	free(s->params.action_is_for_table_entries);
 	s->params.action_is_for_table_entries = NULL;
@@ -804,6 +812,94 @@  table_actions_block_parse(struct table_spec *s,
 	return 0;
 }
 
+static int
+table_default_action_statement_parse(struct table_spec *s,
+				     char **tokens,
+				     uint32_t n_tokens,
+				     uint32_t n_lines,
+				     uint32_t *err_line,
+				     const char **err_msg)
+{
+	uint32_t i;
+	int status = 0, duplicate = 0;
+
+	/* Check format. */
+	if ((n_tokens < 4) ||
+	    strcmp(tokens[2], "args")) {
+		status = -EINVAL;
+		goto error;
+	}
+
+	if (s->params.default_action_name) {
+		duplicate = 1;
+		status = -EINVAL;
+		goto error;
+	}
+
+	s->params.default_action_name = strdup(tokens[1]);
+	if (!s->params.default_action_name) {
+		status = -ENOMEM;
+		goto error;
+	}
+
+	if (strcmp(tokens[3], "none")) {
+		char buffer[MAX_LINE_LENGTH];
+		uint32_t n_tokens_args = n_tokens - 3;
+
+		if (!strcmp(tokens[n_tokens - 1], "const"))
+			n_tokens_args--;
+
+		if (!n_tokens_args) {
+			status = -EINVAL;
+			goto error;
+		}
+
+		buffer[0] = 0;
+		for (i = 0; i < n_tokens_args; i++) {
+			if (i)
+				strcat(buffer, " ");
+
+			strcat(buffer, tokens[3 + i]);
+		}
+
+		s->params.default_action_args = strdup(buffer);
+		if (!s->params.default_action_args) {
+			status = -ENOMEM;
+			goto error;
+		}
+	} else {
+		if (((n_tokens != 4) && (n_tokens != 5)) ||
+		    ((n_tokens == 5) && (strcmp(tokens[4], "const")))) {
+			status = -EINVAL;
+			goto error;
+		}
+	}
+
+	if (!strcmp(tokens[n_tokens - 1], "const"))
+		s->params.default_action_is_const = 1;
+
+	return 0;
+
+error:
+	if (err_line)
+		*err_line = n_lines;
+
+	if (err_msg)
+		switch (status) {
+		case -ENOMEM:
+			*err_msg = "Memory allocation failed.";
+			break;
+
+		default:
+			if (duplicate)
+				*err_msg = "Duplicate default_action statement.";
+
+			*err_msg = "Invalid default_action statement.";
+		}
+
+	return status;
+}
+
 static int
 table_statement_parse(struct table_spec *s,
 		      uint32_t *block_mask,
@@ -887,40 +983,13 @@  table_block_parse(struct table_spec *s,
 						     err_line,
 						     err_msg);
 
-	if (!strcmp(tokens[0], "default_action")) {
-		if (((n_tokens != 4) && (n_tokens != 5)) ||
-		    strcmp(tokens[2], "args") ||
-		    strcmp(tokens[3], "none") ||
-		    ((n_tokens == 5) && strcmp(tokens[4], "const"))) {
-			if (err_line)
-				*err_line = n_lines;
-			if (err_msg)
-				*err_msg = "Invalid default_action statement.";
-			return -EINVAL;
-		}
-
-		if (s->params.default_action_name) {
-			if (err_line)
-				*err_line = n_lines;
-			if (err_msg)
-				*err_msg = "Duplicate default_action stmt.";
-			return -EINVAL;
-		}
-
-		s->params.default_action_name = strdup(tokens[1]);
-		if (!s->params.default_action_name) {
-			if (err_line)
-				*err_line = n_lines;
-			if (err_msg)
-				*err_msg = "Memory allocation failed.";
-			return -ENOMEM;
-		}
-
-		if (n_tokens == 5)
-			s->params.default_action_is_const = 1;
-
-		return 0;
-	}
+	if (!strcmp(tokens[0], "default_action"))
+		return table_default_action_statement_parse(s,
+							    tokens,
+							    n_tokens,
+							    n_lines,
+							    err_line,
+							    err_msg);
 
 	if (!strcmp(tokens[0], "instanceof")) {
 		if (n_tokens != 2) {
@@ -1315,7 +1384,7 @@  selector_block_parse(struct selector_spec *s,
 /*
  * learner.
  *
- * learner {
+ * learner LEARNER_NAME {
  *	key {
  *		MATCH_FIELD_NAME
  *		...
@@ -1324,7 +1393,7 @@  selector_block_parse(struct selector_spec *s,
  *		ACTION_NAME [ @tableonly | @defaultonly]
  *		...
  *	}
- *	default_action ACTION_NAME args none | ARGS_BYTE_ARRAY [ const ]
+ *	default_action ACTION_NAME args none | ARG0_NAME ARG0_VALUE ... [ const ]
  *	size SIZE
  *	timeout TIMEOUT_IN_SECONDS
  * }
@@ -1339,7 +1408,7 @@  struct learner_spec {
 static void
 learner_spec_free(struct learner_spec *s)
 {
-	uintptr_t default_action_name;
+	uintptr_t default_action_name, default_action_args;
 	uint32_t i;
 
 	if (!s)
@@ -1374,8 +1443,9 @@  learner_spec_free(struct learner_spec *s)
 	free((void *)default_action_name);
 	s->params.default_action_name = NULL;
 
-	free(s->params.default_action_data);
-	s->params.default_action_data = NULL;
+	default_action_args = (uintptr_t)s->params.default_action_args;
+	free((void *)default_action_args);
+	s->params.default_action_args = NULL;
 
 	free(s->params.action_is_for_table_entries);
 	s->params.action_is_for_table_entries = NULL;
@@ -1561,6 +1631,94 @@  learner_actions_block_parse(struct learner_spec *s,
 	return 0;
 }
 
+static int
+learner_default_action_statement_parse(struct learner_spec *s,
+				       char **tokens,
+				       uint32_t n_tokens,
+				       uint32_t n_lines,
+				       uint32_t *err_line,
+				       const char **err_msg)
+{
+	uint32_t i;
+	int status = 0, duplicate = 0;
+
+	/* Check format. */
+	if ((n_tokens < 4) ||
+	    strcmp(tokens[2], "args")) {
+		status = -EINVAL;
+		goto error;
+	}
+
+	if (s->params.default_action_name) {
+		duplicate = 1;
+		status = -EINVAL;
+		goto error;
+	}
+
+	s->params.default_action_name = strdup(tokens[1]);
+	if (!s->params.default_action_name) {
+		status = -ENOMEM;
+		goto error;
+	}
+
+	if (strcmp(tokens[3], "none")) {
+		char buffer[MAX_LINE_LENGTH];
+		uint32_t n_tokens_args = n_tokens - 3;
+
+		if (!strcmp(tokens[n_tokens - 1], "const"))
+			n_tokens_args--;
+
+		if (!n_tokens_args) {
+			status = -EINVAL;
+			goto error;
+		}
+
+		buffer[0] = 0;
+		for (i = 0; i < n_tokens_args; i++) {
+			if (i)
+				strcat(buffer, " ");
+
+			strcat(buffer, tokens[3 + i]);
+		}
+
+		s->params.default_action_args = strdup(buffer);
+		if (!s->params.default_action_args) {
+			status = -ENOMEM;
+			goto error;
+		}
+	} else {
+		if (((n_tokens != 4) && (n_tokens != 5)) ||
+		    ((n_tokens == 5) && (strcmp(tokens[4], "const")))) {
+			status = -EINVAL;
+			goto error;
+		}
+	}
+
+	if (!strcmp(tokens[n_tokens - 1], "const"))
+		s->params.default_action_is_const = 1;
+
+	return 0;
+
+error:
+	if (err_line)
+		*err_line = n_lines;
+
+	if (err_msg)
+		switch (status) {
+		case -ENOMEM:
+			*err_msg = "Memory allocation failed.";
+			break;
+
+		default:
+			if (duplicate)
+				*err_msg = "Duplicate default_action statement.";
+
+			*err_msg = "Invalid default_action statement.";
+		}
+
+	return status;
+}
+
 static int
 learner_statement_parse(struct learner_spec *s,
 		      uint32_t *block_mask,
@@ -1644,40 +1802,13 @@  learner_block_parse(struct learner_spec *s,
 						       err_line,
 						       err_msg);
 
-	if (!strcmp(tokens[0], "default_action")) {
-		if (((n_tokens != 4) && (n_tokens != 5)) ||
-		    strcmp(tokens[2], "args") ||
-		    strcmp(tokens[3], "none") ||
-		    ((n_tokens == 5) && strcmp(tokens[4], "const"))) {
-			if (err_line)
-				*err_line = n_lines;
-			if (err_msg)
-				*err_msg = "Invalid default_action statement.";
-			return -EINVAL;
-		}
-
-		if (s->params.default_action_name) {
-			if (err_line)
-				*err_line = n_lines;
-			if (err_msg)
-				*err_msg = "Duplicate default_action stmt.";
-			return -EINVAL;
-		}
-
-		s->params.default_action_name = strdup(tokens[1]);
-		if (!s->params.default_action_name) {
-			if (err_line)
-				*err_line = n_lines;
-			if (err_msg)
-				*err_msg = "Memory allocation failed.";
-			return -ENOMEM;
-		}
-
-		if (n_tokens == 5)
-			s->params.default_action_is_const = 1;
-
-		return 0;
-	}
+	if (!strcmp(tokens[0], "default_action"))
+		return learner_default_action_statement_parse(s,
+							      tokens,
+							      n_tokens,
+							      n_lines,
+							      err_line,
+							      err_msg);
 
 	if (!strcmp(tokens[0], "size")) {
 		char *p = tokens[1];
@@ -2050,7 +2181,7 @@  rte_swx_pipeline_build_from_spec(struct rte_swx_pipeline *p,
 			}
 
 			/* Handle excessively long lines. */
-			if (n_tokens >= MAX_TOKENS) {
+			if (n_tokens >= RTE_DIM(tokens)) {
 				if (err_line)
 					*err_line = n_lines;
 				if (err_msg)