diff mbox series

[3/5] pipeline: add support for selector tables

Message ID 20210702205011.61544-1-cristian.dumitrescu@intel.com (mailing list archive)
State Superseded, archived
Headers show
Series [1/5] examples/pipeline: improve table update CLI commands | expand

Checks

Context Check Description
ci/checkpatch warning coding style issues

Commit Message

Dumitrescu, Cristian July 2, 2021, 8:50 p.m. UTC
Add pipeline-level support for selector tables,

Signed-off-by: Cristian Dumitrescu <cristian.dumitrescu@intel.com>
---
 lib/pipeline/rte_swx_ctl.c           | 700 ++++++++++++++++++++++++-
 lib/pipeline/rte_swx_ctl.h           | 253 +++++++++
 lib/pipeline/rte_swx_pipeline.c      | 748 ++++++++++++++++++++++++---
 lib/pipeline/rte_swx_pipeline.h      |  51 ++
 lib/pipeline/rte_swx_pipeline_spec.c | 354 ++++++++++++-
 lib/pipeline/version.map             |  13 +
 6 files changed, 2034 insertions(+), 85 deletions(-)
diff mbox series

Patch

diff --git a/lib/pipeline/rte_swx_ctl.c b/lib/pipeline/rte_swx_ctl.c
index 5d04e750f..7e5ebb4e5 100644
--- a/lib/pipeline/rte_swx_ctl.c
+++ b/lib/pipeline/rte_swx_ctl.c
@@ -10,6 +10,8 @@ 
 #include <rte_common.h>
 #include <rte_byteorder.h>
 
+#include <rte_swx_table_selector.h>
+
 #include "rte_swx_ctl.h"
 
 #define CHECK(condition, err_code)                                             \
@@ -89,11 +91,44 @@  struct table {
 	uint32_t n_delete;
 };
 
+struct selector {
+	/* Selector table info. */
+	struct rte_swx_ctl_selector_info info;
+
+	/* group_id field. */
+	struct rte_swx_ctl_table_match_field_info group_id_field;
+
+	/* selector fields. */
+	struct rte_swx_ctl_table_match_field_info *selector_fields;
+
+	/* member_id field. */
+	struct rte_swx_ctl_table_match_field_info member_id_field;
+
+	/* Current selector table. Array of info.n_groups_max elements.*/
+	struct rte_swx_table_selector_group **groups;
+
+	/* Pending selector table subject to the next commit. Array of info.n_groups_max elements.
+	 */
+	struct rte_swx_table_selector_group **pending_groups;
+
+	/* Valid flag per group. Array of n_groups_max elements. */
+	int *groups_added;
+
+	/* Pending delete flag per group. Group deletion is subject to the next commit. Array of
+	 * info.n_groups_max elements.
+	 */
+	int *groups_pending_delete;
+
+	/* Params. */
+	struct rte_swx_table_selector_params params;
+};
+
 struct rte_swx_ctl_pipeline {
 	struct rte_swx_ctl_pipeline_info info;
 	struct rte_swx_pipeline *p;
 	struct action *actions;
 	struct table *tables;
+	struct selector *selectors;
 	struct rte_swx_table_state *ts;
 	struct rte_swx_table_state *ts_next;
 	int numa_node;
@@ -709,6 +744,209 @@  table_free(struct rte_swx_ctl_pipeline *ctl)
 	ctl->tables = NULL;
 }
 
+static void
+selector_group_members_free(struct selector *s, uint32_t group_id)
+{
+	struct rte_swx_table_selector_group *group = s->groups[group_id];
+
+	if (!group)
+		return;
+
+	for ( ; ; ) {
+		struct rte_swx_table_selector_member *m;
+
+		m = TAILQ_FIRST(&group->members);
+		if (!m)
+			break;
+
+		TAILQ_REMOVE(&group->members, m, node);
+		free(m);
+	}
+
+	free(group);
+	s->groups[group_id] = NULL;
+}
+
+static void
+selector_pending_group_members_free(struct selector *s, uint32_t group_id)
+{
+	struct rte_swx_table_selector_group *group = s->pending_groups[group_id];
+
+	if (!group)
+		return;
+
+	for ( ; ; ) {
+		struct rte_swx_table_selector_member *m;
+
+		m = TAILQ_FIRST(&group->members);
+		if (!m)
+			break;
+
+		TAILQ_REMOVE(&group->members, m, node);
+		free(m);
+	}
+
+	free(group);
+	s->pending_groups[group_id] = NULL;
+}
+
+static int
+selector_group_duplicate_to_pending(struct selector *s, uint32_t group_id)
+{
+	struct rte_swx_table_selector_group *g, *gp;
+	struct rte_swx_table_selector_member *m;
+
+	selector_pending_group_members_free(s, group_id);
+
+	g = s->groups[group_id];
+	gp = s->pending_groups[group_id];
+
+	if (!gp) {
+		gp = calloc(1, sizeof(struct rte_swx_table_selector_group));
+		if (!gp)
+			goto error;
+
+		TAILQ_INIT(&gp->members);
+
+		s->pending_groups[group_id] = gp;
+	}
+
+	if (!g)
+		return 0;
+
+	TAILQ_FOREACH(m, &g->members, node) {
+		struct rte_swx_table_selector_member *mp;
+
+		mp = calloc(1, sizeof(struct rte_swx_table_selector_member));
+		if (!mp)
+			goto error;
+
+		memcpy(mp, m, sizeof(struct rte_swx_table_selector_member));
+
+		TAILQ_INSERT_TAIL(&gp->members, mp, node);
+	}
+
+	return 0;
+
+error:
+	selector_pending_group_members_free(s, group_id);
+	return -ENOMEM;
+}
+
+static void
+selector_free(struct rte_swx_ctl_pipeline *ctl)
+{
+	uint32_t i;
+
+	if (ctl->selectors)
+		return;
+
+	for (i = 0; i < ctl->info.n_selectors; i++) {
+		struct selector *s = &ctl->selectors[i];
+		uint32_t i;
+
+		/* selector_fields. */
+		free(s->selector_fields);
+
+		/* groups. */
+		if (s->groups)
+			for (i = 0; i < s->info.n_groups_max; i++)
+				selector_group_members_free(s, i);
+
+		free(s->groups);
+
+		/* pending_groups. */
+		if (s->pending_groups)
+			for (i = 0; i < s->info.n_groups_max; i++)
+				selector_pending_group_members_free(s, i);
+
+		free(s->pending_groups);
+
+		/* groups_added. */
+		free(s->groups_added);
+
+		/* groups_pending_delete. */
+		free(s->groups_pending_delete);
+
+		/* params. */
+		free(s->params.selector_mask);
+	}
+
+	free(ctl->selectors);
+	ctl->selectors = NULL;
+}
+
+static struct selector *
+selector_find(struct rte_swx_ctl_pipeline *ctl, const char *selector_name)
+{
+	uint32_t i;
+
+	for (i = 0; i < ctl->info.n_selectors; i++) {
+		struct selector *s = &ctl->selectors[i];
+
+		if (!strcmp(selector_name, s->info.name))
+			return s;
+	}
+
+	return NULL;
+}
+
+static int
+selector_params_get(struct rte_swx_ctl_pipeline *ctl, uint32_t selector_id)
+{
+	struct selector *s = &ctl->selectors[selector_id];
+	struct rte_swx_ctl_table_match_field_info *first = NULL, *last = NULL;
+	uint8_t *selector_mask = NULL;
+	uint32_t selector_size = 0, selector_offset = 0, i;
+
+	/* Find first (smallest offset) and last (biggest offset) match fields. */
+	first = &s->selector_fields[0];
+	last = &s->selector_fields[0];
+
+	for (i = 1; i < s->info.n_selector_fields; i++) {
+		struct rte_swx_ctl_table_match_field_info *f = &s->selector_fields[i];
+
+		if (f->offset < first->offset)
+			first = f;
+
+		if (f->offset > last->offset)
+			last = f;
+	}
+
+	/* selector_offset. */
+	selector_offset = first->offset / 8;
+
+	/* selector_size. */
+	selector_size = (last->offset + last->n_bits - first->offset) / 8;
+
+	/* selector_mask. */
+	selector_mask = calloc(1, selector_size);
+	if (!selector_mask)
+		return -ENOMEM;
+
+	for (i = 0; i < s->info.n_selector_fields; i++) {
+		struct rte_swx_ctl_table_match_field_info *f = &s->selector_fields[i];
+		uint32_t start;
+		size_t size;
+
+		start = (f->offset - first->offset) / 8;
+		size = f->n_bits / 8;
+
+		memset(&selector_mask[start], 0xFF, size);
+	}
+
+	/* Fill in. */
+	s->params.group_id_offset = s->group_id_field.offset / 8;
+	s->params.selector_size = selector_size;
+	s->params.selector_offset = selector_offset;
+	s->params.selector_mask = selector_mask;
+	s->params.member_id_offset = s->member_id_field.offset / 8;
+	s->params.n_groups_max = s->info.n_groups_max;
+	s->params.n_members_per_group_max = s->info.n_members_per_group_max;
+
+	return 0;
+}
+
 static void
 table_state_free(struct rte_swx_ctl_pipeline *ctl)
 {
@@ -730,6 +968,15 @@  table_state_free(struct rte_swx_ctl_pipeline *ctl)
 			table->ops.free(ts->obj);
 	}
 
+	/* For each selector table, free its table state. */
+	for (i = 0; i < ctl->info.n_selectors; i++) {
+		struct rte_swx_table_state *ts = &ctl->ts_next[i];
+
+		/* Table object. */
+		if (ts->obj)
+			rte_swx_table_selector_free(ts->obj);
+	}
+
 	free(ctl->ts_next);
 	ctl->ts_next = NULL;
 }
@@ -740,13 +987,14 @@  table_state_create(struct rte_swx_ctl_pipeline *ctl)
 	int status = 0;
 	uint32_t i;
 
-	ctl->ts_next = calloc(ctl->info.n_tables,
+	ctl->ts_next = calloc(ctl->info.n_tables + ctl->info.n_selectors,
 			      sizeof(struct rte_swx_table_state));
 	if (!ctl->ts_next) {
 		status = -ENOMEM;
 		goto error;
 	}
 
+	/* Tables. */
 	for (i = 0; i < ctl->info.n_tables; i++) {
 		struct table *table = &ctl->tables[i];
 		struct rte_swx_table_state *ts = &ctl->ts[i];
@@ -782,6 +1030,19 @@  table_state_create(struct rte_swx_ctl_pipeline *ctl)
 		ts_next->default_action_id = ts->default_action_id;
 	}
 
+	/* Selector tables. */
+	for (i = 0; i < ctl->info.n_selectors; i++) {
+		struct selector *s = &ctl->selectors[i];
+		struct rte_swx_table_state *ts_next = &ctl->ts_next[ctl->info.n_tables + i];
+
+		/* Table object. */
+		ts_next->obj = rte_swx_table_selector_create(&s->params, NULL, ctl->numa_node);
+		if (!ts_next->obj) {
+			status = -ENODEV;
+			goto error;
+		}
+	}
+
 	return 0;
 
 error:
@@ -799,6 +1060,8 @@  rte_swx_ctl_pipeline_free(struct rte_swx_ctl_pipeline *ctl)
 
 	table_state_free(ctl);
 
+	selector_free(ctl);
+
 	table_free(ctl);
 
 	free(ctl);
@@ -940,6 +1203,77 @@  rte_swx_ctl_pipeline_create(struct rte_swx_pipeline *p)
 			goto error;
 	}
 
+	/* selector tables. */
+	ctl->selectors = calloc(ctl->info.n_selectors, sizeof(struct selector));
+	if (!ctl->selectors)
+		goto error;
+
+	for (i = 0; i < ctl->info.n_selectors; i++) {
+		struct selector *s = &ctl->selectors[i];
+		uint32_t j;
+
+		/* info. */
+		status = rte_swx_ctl_selector_info_get(p, i, &s->info);
+		if (status)
+			goto error;
+
+		/* group_id field. */
+		status = rte_swx_ctl_selector_group_id_field_info_get(p,
+			i,
+			&s->group_id_field);
+		if (status)
+			goto error;
+
+		/* selector fields. */
+		s->selector_fields = calloc(s->info.n_selector_fields,
+			sizeof(struct rte_swx_ctl_table_match_field_info));
+		if (!s->selector_fields)
+			goto error;
+
+		for (j = 0; j < s->info.n_selector_fields; j++) {
+			status = rte_swx_ctl_selector_field_info_get(p,
+				i,
+				j,
+				&s->selector_fields[j]);
+			if (status)
+				goto error;
+		}
+
+		/* member_id field. */
+		status = rte_swx_ctl_selector_member_id_field_info_get(p,
+			i,
+			&s->member_id_field);
+		if (status)
+			goto error;
+
+		/* groups. */
+		s->groups = calloc(s->info.n_groups_max,
+			sizeof(struct rte_swx_table_selector_group *));
+		if (!s->groups)
+			goto error;
+
+		/* pending_groups. */
+		s->pending_groups = calloc(s->info.n_groups_max,
+			sizeof(struct rte_swx_table_selector_group *));
+		if (!s->pending_groups)
+			goto error;
+
+		/* groups_added. */
+		s->groups_added = calloc(s->info.n_groups_max, sizeof(int));
+		if (!s->groups_added)
+			goto error;
+
+		/* groups_pending_delete. */
+		s->groups_pending_delete = calloc(s->info.n_groups_max, sizeof(int));
+		if (!s->groups_pending_delete)
+			goto error;
+
+		/* params. */
+		status = selector_params_get(ctl, i);
+		if (status)
+			goto error;
+	}
+
 	/* ts. */
 	status = rte_swx_pipeline_table_state_get(p, &ctl->ts);
 	if (status)
@@ -1499,6 +1833,295 @@  table_abort(struct rte_swx_ctl_pipeline *ctl, uint32_t table_id)
 	table_pending_default_free(table);
 }
 
+int
+rte_swx_ctl_pipeline_selector_group_add(struct rte_swx_ctl_pipeline *ctl,
+					const char *selector_name,
+					uint32_t *group_id)
+{
+	struct selector *s;
+	uint32_t i;
+
+	/* Check input arguments. */
+	if (!ctl || !selector_name || !selector_name[0] || !group_id)
+		return -EINVAL;
+
+	s = selector_find(ctl, selector_name);
+	if (!s)
+		return -EINVAL;
+
+	/* Find an unused group. */
+	for (i = 0; i < s->info.n_groups_max; i++)
+		if (!s->groups_added[i]) {
+			*group_id = i;
+			s->groups_added[i] = 1;
+			return 0;
+		}
+
+	return -ENOSPC;
+}
+
+int
+rte_swx_ctl_pipeline_selector_group_delete(struct rte_swx_ctl_pipeline *ctl,
+					   const char *selector_name,
+					   uint32_t group_id)
+{
+	struct selector *s;
+	struct rte_swx_table_selector_group *group;
+
+	/* Check input arguments. */
+	if (!ctl || !selector_name || !selector_name[0])
+		return -EINVAL;
+
+	s = selector_find(ctl, selector_name);
+	if (!s ||
+	   (group_id >= s->info.n_groups_max) ||
+	   !s->groups_added[group_id])
+		return -EINVAL;
+
+	/* Check if this group is already scheduled for deletion. */
+	if (s->groups_pending_delete[group_id])
+		return 0;
+
+	/* Initialize the pending group, if needed. */
+	if (!s->pending_groups[group_id]) {
+		int status;
+
+		status = selector_group_duplicate_to_pending(s, group_id);
+		if (status)
+			return status;
+	}
+
+	group = s->pending_groups[group_id];
+
+	/* Schedule removal of all the members from the current group. */
+	for ( ; ; ) {
+		struct rte_swx_table_selector_member *m;
+
+		m = TAILQ_FIRST(&group->members);
+		if (!m)
+			break;
+
+		TAILQ_REMOVE(&group->members, m, node);
+		free(m);
+	}
+
+	/* Schedule the group for deletion. */
+	s->groups_pending_delete[group_id] = 1;
+
+	return 0;	
+}
+
+int
+rte_swx_ctl_pipeline_selector_group_member_add(struct rte_swx_ctl_pipeline *ctl,
+					       const char *selector_name,
+					       uint32_t group_id,
+					       uint32_t member_id,
+					       uint32_t member_weight)
+{
+	struct selector *s;
+	struct rte_swx_table_selector_group *group;
+	struct rte_swx_table_selector_member *m;
+
+	if (!member_weight)
+		return rte_swx_ctl_pipeline_selector_group_member_delete(ctl,
+									 selector_name,
+									 group_id,
+									 member_id);
+
+	/* Check input arguments. */
+	if (!ctl || !selector_name || !selector_name[0])
+		return -EINVAL;
+
+	s = selector_find(ctl, selector_name);
+	if (!s ||
+	   (group_id >= s->info.n_groups_max) ||
+	   !s->groups_added[group_id] ||
+	   s->groups_pending_delete[group_id])
+		return -EINVAL;
+
+	/* Initialize the pending group, if needed. */
+	if (!s->pending_groups[group_id]) {
+		int status;
+
+		status = selector_group_duplicate_to_pending(s, group_id);
+		if (status)
+			return status;
+	}
+
+	group = s->pending_groups[group_id];
+
+	/* If this member is already in this group, then simply update its weight and return. */
+	TAILQ_FOREACH(m, &group->members, node)
+		if (m->member_id == member_id) {
+			m->member_weight = member_weight;
+			return 0;			
+		}
+
+	/* Add new member to this group. */
+	m = calloc(1, sizeof(struct rte_swx_table_selector_member));
+	if (!m)
+		return -ENOMEM;
+
+	m->member_id = member_id;
+	m->member_weight = member_weight;
+
+	TAILQ_INSERT_TAIL(&group->members, m, node);
+
+	return 0;
+}
+
+int
+rte_swx_ctl_pipeline_selector_group_member_delete(struct rte_swx_ctl_pipeline *ctl,
+						  const char *selector_name,
+						  uint32_t group_id __rte_unused,
+						  uint32_t member_id __rte_unused)
+{
+	struct selector *s;
+	struct rte_swx_table_selector_group *group;
+	struct rte_swx_table_selector_member *m;
+
+	/* Check input arguments. */
+	if (!ctl || !selector_name || !selector_name[0])
+		return -EINVAL;
+
+	s = selector_find(ctl, selector_name);
+	if (!s ||
+	    (group_id >= s->info.n_groups_max) ||
+	    !s->groups_added[group_id] ||
+	    s->groups_pending_delete[group_id])
+		return -EINVAL;
+
+	/* Initialize the pending group, if needed. */
+	if (!s->pending_groups[group_id]) {
+		int status;
+
+		status = selector_group_duplicate_to_pending(s, group_id);
+		if (status)
+			return status;
+	}
+
+	group = s->pending_groups[group_id];
+
+	/* Look for this member in the group and remove it, if found. */
+	TAILQ_FOREACH(m, &group->members, node)
+		if (m->member_id == member_id) {
+			TAILQ_REMOVE(&group->members, m, node);
+			free(m);
+			return 0;
+		}
+
+	return 0;
+}
+
+static int
+selector_rollfwd(struct rte_swx_ctl_pipeline *ctl, uint32_t selector_id)
+{
+	struct selector *s = &ctl->selectors[selector_id];
+	struct rte_swx_table_state *ts_next = &ctl->ts_next[ctl->info.n_tables + selector_id];
+	uint32_t group_id;
+
+	/* Push pending group member changes (s->pending_groups[group_id]) to the selector table
+	 * mirror copy (ts_next->obj).
+	 */
+	for (group_id = 0; group_id < s->info.n_groups_max; group_id++) {
+		struct rte_swx_table_selector_group *group = s->pending_groups[group_id];
+		int status;
+
+		/* Skip this group if no change needed. */
+		if (!group)
+			continue;
+
+		/* Apply the pending changes for the current group. */
+		status = rte_swx_table_selector_group_set(ts_next->obj, group_id, group);
+		if (status)
+			return status;
+	}
+
+	return 0;
+}
+
+static void
+selector_rollfwd_finalize(struct rte_swx_ctl_pipeline *ctl, uint32_t selector_id)
+{
+	struct selector *s = &ctl->selectors[selector_id];
+	uint32_t group_id;
+
+	/* Commit pending group member changes (s->pending_groups[group_id]) to the stable group
+	 * records (s->groups[group_id).
+	 */
+	for (group_id = 0; group_id < s->info.n_groups_max; group_id++) {
+		struct rte_swx_table_selector_group *g = s->groups[group_id];
+		struct rte_swx_table_selector_group *gp = s->pending_groups[group_id];
+
+		/* Skip this group if no change needed. */
+		if (!gp)
+			continue;
+
+		/* Transition the pending changes to stable. */
+		s->groups[group_id] = gp;
+		s->pending_groups[group_id] = NULL;
+
+		/* Free the old group member list. */
+		if (!g)
+			continue;
+
+		for ( ; ; ) {
+			struct rte_swx_table_selector_member *m;
+
+			m = TAILQ_FIRST(&g->members);
+			if (!m)
+				break;
+
+			TAILQ_REMOVE(&g->members, m, node);
+			free(m);
+		}
+
+		free(g);
+	}
+
+	/* Commit pending group validity changes (from s->groups_pending_delete[group_id] to
+	 * s->groups_added[group_id].
+	 */
+	for (group_id = 0; group_id < s->info.n_groups_max; group_id++)
+		if (s->groups_pending_delete[group_id]) {
+			s->groups_added[group_id] = 0;
+			s->groups_pending_delete[group_id] = 0;
+		}
+}
+
+static void
+selector_rollback(struct rte_swx_ctl_pipeline *ctl, uint32_t selector_id)
+{
+	struct selector *s = &ctl->selectors[selector_id];
+	struct rte_swx_table_state *ts = &ctl->ts[ctl->info.n_tables + selector_id];
+	struct rte_swx_table_state *ts_next = &ctl->ts_next[ctl->info.n_tables + selector_id];
+	uint32_t group_id;
+
+	/* Discard any previous changes to the selector table mirror copy (ts_next->obj). */
+	for (group_id = 0; group_id < s->info.n_groups_max; group_id++) {
+		struct rte_swx_table_selector_group *gp = s->pending_groups[group_id];
+
+		if (gp) {
+			ts_next->obj = ts->obj;
+			break;
+		}
+	}
+}
+
+static void
+selector_abort(struct rte_swx_ctl_pipeline *ctl, uint32_t selector_id)
+{
+	struct selector *s = &ctl->selectors[selector_id];
+	uint32_t group_id;
+
+	/* Discard any pending group member changes (s->pending_groups[group_id]). */
+	for (group_id = 0; group_id < s->info.n_groups_max; group_id++)
+		selector_pending_group_members_free(s, group_id);
+
+	/* Discard any pending group deletions. */
+	memset(s->groups_pending_delete, 0, s->info.n_groups_max * sizeof(int));
+}
+
 int
 rte_swx_ctl_pipeline_commit(struct rte_swx_ctl_pipeline *ctl, int abort_on_fail)
 {
@@ -1508,8 +2131,8 @@  rte_swx_ctl_pipeline_commit(struct rte_swx_ctl_pipeline *ctl, int abort_on_fail)
 
 	CHECK(ctl, EINVAL);
 
-	/* Operate the changes on the current ts_next before it becomes the new
-	 * ts.
+	/* Operate the changes on the current ts_next before it becomes the new ts. First, operate
+	 * all the changes that can fail; if no failure, then operate the changes that cannot fail.
 	 */
 	for (i = 0; i < ctl->info.n_tables; i++) {
 		status = table_rollfwd0(ctl, i, 0);
@@ -1517,6 +2140,12 @@  rte_swx_ctl_pipeline_commit(struct rte_swx_ctl_pipeline *ctl, int abort_on_fail)
 			goto rollback;
 	}
 
+	for (i = 0; i < ctl->info.n_selectors; i++) {
+		status = selector_rollfwd(ctl, i);
+		if (status)
+			goto rollback;
+	}
+
 	for (i = 0; i < ctl->info.n_tables; i++)
 		table_rollfwd1(ctl, i);
 
@@ -1529,7 +2158,10 @@  rte_swx_ctl_pipeline_commit(struct rte_swx_ctl_pipeline *ctl, int abort_on_fail)
 	ctl->ts = ctl->ts_next;
 	ctl->ts_next = ts;
 
-	/* Operate the changes on the current ts_next, which is the previous ts.
+	/* Operate the changes on the current ts_next, which is the previous ts, in order to get
+	 * the current ts_next in sync with the current ts. Since the changes that can fail did
+	 * not fail on the previous ts_next, it is guaranteed that they will not fail on the
+	 * current ts_next, hence no error checking is needed.
 	 */
 	for (i = 0; i < ctl->info.n_tables; i++) {
 		table_rollfwd0(ctl, i, 1);
@@ -1537,6 +2169,11 @@  rte_swx_ctl_pipeline_commit(struct rte_swx_ctl_pipeline *ctl, int abort_on_fail)
 		table_rollfwd2(ctl, i);
 	}
 
+	for (i = 0; i < ctl->info.n_selectors; i++) {
+		selector_rollfwd(ctl, i);
+		selector_rollfwd_finalize(ctl, i);
+	}
+
 	return 0;
 
 rollback:
@@ -1546,6 +2183,12 @@  rte_swx_ctl_pipeline_commit(struct rte_swx_ctl_pipeline *ctl, int abort_on_fail)
 			table_abort(ctl, i);
 	}
 
+	for (i = 0; i < ctl->info.n_selectors; i++) {
+		selector_rollback(ctl, i);
+		if (abort_on_fail)
+			selector_abort(ctl, i);
+	}
+
 	return status;
 }
 
@@ -1559,6 +2202,9 @@  rte_swx_ctl_pipeline_abort(struct rte_swx_ctl_pipeline *ctl)
 
 	for (i = 0; i < ctl->info.n_tables; i++)
 		table_abort(ctl, i);
+
+	for (i = 0; i < ctl->info.n_selectors; i++)
+		selector_abort(ctl, i);
 }
 
 static int
@@ -1858,3 +2504,49 @@  rte_swx_ctl_pipeline_table_fprintf(FILE *f,
 		n_entries);
 	return 0;
 }
+
+int
+rte_swx_ctl_pipeline_selector_fprintf(FILE *f,
+				      struct rte_swx_ctl_pipeline *ctl,
+				      const char *selector_name)
+{
+	struct selector *s;
+	uint32_t group_id;
+
+	if (!f || !ctl || !selector_name || !selector_name[0])
+		return -EINVAL;
+
+	s = selector_find(ctl, selector_name);
+	if(!s)
+		return -EINVAL;
+
+	/* Selector. */
+	fprintf(f, "# Selector %s: max groups %u, max members per group %u\n",
+		s->info.name,
+		s->info.n_groups_max,
+		s->info.n_members_per_group_max);
+
+	/* Groups. */
+	for (group_id = 0; group_id < s->info.n_groups_max; group_id++) {
+		struct rte_swx_table_selector_group *group = s->groups[group_id];
+		struct rte_swx_table_selector_member *m;
+		uint32_t n_members = 0;
+
+		fprintf(f, "Group %u = [", group_id);
+
+		/* Non-empty group. */
+		if (group)
+			TAILQ_FOREACH(m, &group->members, node) {
+				fprintf(f, "%u:%u ", m->member_id, m->member_weight);
+				n_members++;
+			}
+
+		/* Empty group. */
+		if (!n_members)
+			fprintf(f, "0:1 ");
+
+		fprintf(f, "]\n");
+	}
+
+	return 0;
+}
diff --git a/lib/pipeline/rte_swx_ctl.h b/lib/pipeline/rte_swx_ctl.h
index dee788be8..f37301cf9 100644
--- a/lib/pipeline/rte_swx_ctl.h
+++ b/lib/pipeline/rte_swx_ctl.h
@@ -22,6 +22,7 @@  extern "C" {
 
 #include "rte_swx_port.h"
 #include "rte_swx_table.h"
+#include "rte_swx_table_selector.h"
 
 struct rte_swx_pipeline;
 
@@ -48,6 +49,9 @@  struct rte_swx_ctl_pipeline_info {
 	/** Number of tables. */
 	uint32_t n_tables;
 
+	/** Number of selector tables. */
+	uint32_t n_selectors;
+
 	/** Number of register arrays. */
 	uint32_t n_regarrays;
 
@@ -385,6 +389,129 @@  rte_swx_ctl_pipeline_table_stats_read(struct rte_swx_pipeline *p,
 				      const char *table_name,
 				      struct rte_swx_table_stats *stats);
 
+/*
+ * Selector Table Query API.
+ */
+
+/** Selector info. */
+struct rte_swx_ctl_selector_info {
+	/** Selector table name. */
+	char name[RTE_SWX_CTL_NAME_SIZE];
+
+	/** Number of selector fields. */
+	uint32_t n_selector_fields;
+
+	/** Maximum number of groups. */
+	uint32_t n_groups_max;
+
+	/** Maximum number of members per group. */
+	uint32_t n_members_per_group_max;
+};
+
+/**
+ * Selector table info get
+ *
+ * @param[in] p
+ *   Pipeline handle.
+ * @param[in] selector_id
+ *   Selector table ID (0 .. *n_selectors* - 1).
+ * @param[out] selector
+ *   Selector table info.
+ * @return
+ *   0 on success or the following error codes otherwise:
+ *   -EINVAL: Invalid argument.
+ */
+__rte_experimental
+int
+rte_swx_ctl_selector_info_get(struct rte_swx_pipeline *p,
+			      uint32_t selector_id,
+			      struct rte_swx_ctl_selector_info *selector);
+
+/**
+ * Selector table "group ID" field info get
+ *
+ * @param[in] p
+ *   Pipeline handle.
+ * @param[in] selector_id
+ *   Selector table ID (0 .. *n_selectors*).
+ * @param[out] field
+ *   Selector table "group ID" field info.
+ * @return
+ *   0 on success or the following error codes otherwise:
+ *   -EINVAL: Invalid argument.
+ */
+__rte_experimental
+int
+rte_swx_ctl_selector_group_id_field_info_get(struct rte_swx_pipeline *p,
+					     uint32_t selector_id,
+					     struct rte_swx_ctl_table_match_field_info *field);
+
+/**
+ * Sselector table selector field info get
+ *
+ * @param[in] p
+ *   Pipeline handle.
+ * @param[in] selector_id
+ *   Selector table ID (0 .. *n_selectors*).
+ * @param[in] selector_field_id
+ *   Selector table selector field ID (0 .. *n_selector_fields* - 1).
+ * @param[out] field
+ *   Selector table selector field info.
+ * @return
+ *   0 on success or the following error codes otherwise:
+ *   -EINVAL: Invalid argument.
+ */
+__rte_experimental
+int
+rte_swx_ctl_selector_field_info_get(struct rte_swx_pipeline *p,
+				    uint32_t selector_id,
+				    uint32_t selector_field_id,
+				    struct rte_swx_ctl_table_match_field_info *field);
+
+/**
+ * Selector table "member ID" field info get
+ *
+ * @param[in] p
+ *   Pipeline handle.
+ * @param[in] selector_id
+ *   Selector table ID (0 .. *n_selectors*).
+ * @param[out] field
+ *   Selector table "member ID" field info.
+ * @return
+ *   0 on success or the following error codes otherwise:
+ *   -EINVAL: Invalid argument.
+ */
+__rte_experimental
+int
+rte_swx_ctl_selector_member_id_field_info_get(struct rte_swx_pipeline *p,
+					      uint32_t selector_id,
+					      struct rte_swx_ctl_table_match_field_info *field);
+
+/** Selector table statistics. */
+struct rte_swx_pipeline_selector_stats {
+	/** Number of packets. */
+	uint64_t n_pkts;
+};
+
+/**
+ * Selector table statistics counters read
+ *
+ * @param[in] p
+ *   Pipeline handle.
+ * @param[in] selector_name
+ *   Selector table name.
+ * @param[out] stats
+ *   Selector table stats. Must point to a pre-allocated structure.
+ * @return
+ *   0 on success or the following error codes otherwise:
+ *   -EINVAL: Invalid argument.
+ */
+__rte_experimental
+int
+rte_swx_ctl_pipeline_selector_stats_read(struct rte_swx_pipeline *p,
+					 const char *selector_name,
+					 struct rte_swx_pipeline_selector_stats *stats);
+
 /*
  * Table Update API.
  */
@@ -529,6 +656,111 @@  rte_swx_ctl_pipeline_table_entry_delete(struct rte_swx_ctl_pipeline *ctl,
 					const char *table_name,
 					struct rte_swx_table_entry *entry);
 
+/**
+ * Pipeline selector table group add
+ *
+ * Add a new group to a selector table. This operation is executed before this
+ * function returns and its result is independent of the result of the next
+ * commit operation.
+ *
+ * @param[in] ctl
+ *   Pipeline control handle.
+ * @param[in] selector_name
+ *   Selector table name.
+ * @param[out] group_id
+ *   The ID of the new group. Only valid when the function call is successful.
+ *   This group is initially empty, i.e. it does not contain any members.
+ * @return
+ *   0 on success or the following error codes otherwise:
+ *   -EINVAL: Invalid argument;
+ *   -ENOSPC: All groups are currently in use, no group available.
+ */
+__rte_experimental
+int
+rte_swx_ctl_pipeline_selector_group_add(struct rte_swx_ctl_pipeline *ctl,
+					const char *selector_name,
+					uint32_t *group_id);
+
+/**
+ * Pipeline selector table group delete
+ *
+ * Schedule a group for deletion as part of the next commit operation. The group
+ * to be deleted can be empty or non-empty.
+ *
+ * @param[in] ctl
+ *   Pipeline control handle.
+ * @param[in] selector_name
+ *   Selector table name.
+ * @param[in] group_id
+ *   Group to be deleted from the selector table.
+ * @return
+ *   0 on success or the following error codes otherwise:
+ *   -EINVAL: Invalid argument;
+ *   -ENOMEM: Not enough memory.
+ */
+__rte_experimental
+int
+rte_swx_ctl_pipeline_selector_group_delete(struct rte_swx_ctl_pipeline *ctl,
+					   const char *selector_name,
+					   uint32_t group_id);
+
+/**
+ * Pipeline selector table member add to group
+ *
+ * Schedule the operation to add a new member to an existing group as part of
+ * the next commit operation. If this member is already in this group, the
+ * member weight is updated to the new value. A weight of zero means this member
+ * is to be deleted from the group.
+ *
+ * @param[in] ctl
+ *   Pipeline control handle.
+ * @param[in] selector_name
+ *   Selector table name.
+ * @param[in] group_id
+ *   The group ID.
+ * @param[in] member_id
+ *   The member to be added to the group.
+ * @param[in] member_weight
+ *   Member weight.
+ * @return
+ *   0 on success or the following error codes otherwise:
+ *   -EINVAL: Invalid argument;
+ *   -ENOMEM: Not enough memory;
+ *   -ENOSPC: The group is full.
+ */
+__rte_experimental
+int
+rte_swx_ctl_pipeline_selector_group_member_add(struct rte_swx_ctl_pipeline *ctl,
+					       const char *selector_name,
+					       uint32_t group_id,
+					       uint32_t member_id,
+					       uint32_t member_weight);
+
+/**
+ * Pipeline selector table member delete from group
+ *
+ * Schedule the operation to delete a member from an existing group as part of
+ * the next commit operation.
+ *
+ * @param[in] ctl
+ *   Pipeline control handle.
+ * @param[in] selector_name
+ *   Selector table name.
+ * @param[in] group_id
+ *   The group ID. Must be valid.
+ * @param[in] member_id
+ *   The member to be added to the group. Must be valid.
+ * @return
+ *   0 on success or the following error codes otherwise:
+ *   -EINVAL: Invalid argument.
+ */
+__rte_experimental
+int
+rte_swx_ctl_pipeline_selector_group_member_delete(struct rte_swx_ctl_pipeline *ctl,
+						  const char *selector_name,
+						  uint32_t group_id,
+						  uint32_t member_id);
+
 /**
  * Pipeline commit
  *
@@ -608,6 +840,27 @@  rte_swx_ctl_pipeline_table_fprintf(FILE *f,
 				   struct rte_swx_ctl_pipeline *ctl,
 				   const char *table_name);
 
+/**
+ * Pipeline selector print to file
+ *
+ * Print all the selector entries to file.
+ *
+ * @param[in] f
+ *   Output file.
+ * @param[in] ctl
+ *   Pipeline control handle.
+ * @param[in] selector_name
+ *   Selector table name.
+ * @return
+ *   0 on success or the following error codes otherwise:
+ *   -EINVAL: Invalid argument.
+ */
+__rte_experimental
+int
+rte_swx_ctl_pipeline_selector_fprintf(FILE *f,
+				      struct rte_swx_ctl_pipeline *ctl,
+				      const char *selector_name);
+
 /*
  * Register Array Query API.
  */
diff --git a/lib/pipeline/rte_swx_pipeline.c b/lib/pipeline/rte_swx_pipeline.c
index a2732a1e5..22c860f28 100644
--- a/lib/pipeline/rte_swx_pipeline.c
+++ b/lib/pipeline/rte_swx_pipeline.c
@@ -15,6 +15,8 @@ 
 #include <rte_cycles.h>
 #include <rte_meter.h>
 
+#include <rte_swx_table_selector.h>
+
 #include "rte_swx_pipeline.h"
 #include "rte_swx_ctl.h"
 
@@ -498,6 +500,7 @@  enum instruction_type {
 
 	/* table TABLE */
 	INSTR_TABLE,
+	INSTR_SELECTOR,
 
 	/* extern e.obj.func */
 	INSTR_EXTERN_OBJ,
@@ -794,6 +797,38 @@  struct table_statistics {
 	uint64_t *n_pkts_action;
 };
 
+/*
+ * Selector.
+ */
+struct selector {
+	TAILQ_ENTRY(selector) node;
+	char name[RTE_SWX_NAME_SIZE];
+
+	struct field *group_id_field;
+	struct field **selector_fields;
+	uint32_t n_selector_fields;
+	struct header *selector_header;
+	struct field *member_id_field;
+
+	uint32_t n_groups_max;
+	uint32_t n_members_per_group_max;
+
+	uint32_t id;
+};
+
+TAILQ_HEAD(selector_tailq, selector);
+
+struct selector_runtime {
+	void *mailbox;
+	uint8_t **group_id_buffer;
+	uint8_t **selector_buffer;
+	uint8_t **member_id_buffer;
+};
+
+struct selector_statistics {
+	uint64_t n_pkts;
+};
+
 /*
  * Register array.
  */
@@ -873,6 +908,7 @@  struct thread {
 
 	/* Tables. */
 	struct table_runtime *tables;
+	struct selector_runtime *selectors;
 	struct rte_swx_table_state *table_state;
 	uint64_t action_id;
 	int hit; /* 0 = Miss, 1 = Hit. */
@@ -1308,6 +1344,7 @@  struct rte_swx_pipeline {
 	struct action_tailq actions;
 	struct table_type_tailq table_types;
 	struct table_tailq tables;
+	struct selector_tailq selectors;
 	struct regarray_tailq regarrays;
 	struct meter_profile_tailq meter_profiles;
 	struct metarray_tailq metarrays;
@@ -1317,6 +1354,7 @@  struct rte_swx_pipeline {
 	struct instruction **action_instructions;
 	struct rte_swx_table_state *table_state;
 	struct table_statistics *table_stats;
+	struct selector_statistics *selector_stats;
 	struct regarray_runtime *regarray_runtime;
 	struct metarray_runtime *metarray_runtime;
 	struct instruction *instructions;
@@ -1329,6 +1367,7 @@  struct rte_swx_pipeline {
 	uint32_t n_extern_funcs;
 	uint32_t n_actions;
 	uint32_t n_tables;
+	uint32_t n_selectors;
 	uint32_t n_regarrays;
 	uint32_t n_metarrays;
 	uint32_t n_headers;
@@ -3450,6 +3489,9 @@  instr_hdr_invalidate_exec(struct rte_swx_pipeline *p)
 static struct table *
 table_find(struct rte_swx_pipeline *p, const char *name);
 
+static struct selector *
+selector_find(struct rte_swx_pipeline *p, const char *name);
+
 static int
 instr_table_translate(struct rte_swx_pipeline *p,
 		      struct action *action,
@@ -3459,16 +3501,26 @@  instr_table_translate(struct rte_swx_pipeline *p,
 		      struct instruction_data *data __rte_unused)
 {
 	struct table *t;
+	struct selector *s;
 
 	CHECK(!action, EINVAL);
 	CHECK(n_tokens == 2, EINVAL);
 
 	t = table_find(p, tokens[1]);
-	CHECK(t, EINVAL);
+	if (t) {
+		instr->type = INSTR_TABLE;
+		instr->table.table_id = t->id;
+		return 0;
+	}
 
-	instr->type = INSTR_TABLE;
-	instr->table.table_id = t->id;
-	return 0;
+	s = selector_find(p, tokens[1]);
+	if (s) {
+		instr->type = INSTR_SELECTOR;
+		instr->table.table_id = s->id;
+		return 0;
+	}
+
+	CHECK(0, EINVAL);
 }
 
 static inline void
@@ -3522,6 +3574,45 @@  instr_table_exec(struct rte_swx_pipeline *p)
 	thread_ip_action_call(p, t, action_id);
 }
 
+static inline void
+instr_selector_exec(struct rte_swx_pipeline *p)
+{
+	struct thread *t = &p->threads[p->thread_id];
+	struct instruction *ip = t->ip;
+	uint32_t selector_id = ip->table.table_id;
+	struct rte_swx_table_state *ts = &t->table_state[p->n_tables + selector_id];
+	struct selector_runtime *selector = &t->selectors[selector_id];
+	struct selector_statistics *stats = &p->selector_stats[selector_id];
+	uint64_t n_pkts = stats->n_pkts;
+	int done;
+
+	/* Table. */
+	done = rte_swx_table_selector_select(ts->obj,
+			   selector->mailbox,
+			   selector->group_id_buffer,
+			   selector->selector_buffer,
+			   selector->member_id_buffer);
+	if (!done) {
+		/* Thread. */
+		TRACE("[Thread %2u] selector %u (not finalized)\n",
+		      p->thread_id,
+		      selector_id);
+
+		thread_yield(p);
+		return;
+	}
+
+
+	TRACE("[Thread %2u] selector %u\n",
+	      p->thread_id,
+	      selector_id);
+
+	stats->n_pkts = n_pkts + 1;
+
+	/* Thread. */
+	thread_ip_inc(p);
+}
+
 /*
  * extern.
  */
@@ -8787,6 +8878,7 @@  static instr_exec_t instruction_table[] = {
 	[INSTR_METER_IMI] = instr_meter_imi_exec,
 
 	[INSTR_TABLE] = instr_table_exec,
+	[INSTR_SELECTOR] = instr_selector_exec,
 	[INSTR_EXTERN_OBJ] = instr_extern_obj_exec,
 	[INSTR_EXTERN_FUNC] = instr_extern_func_exec,
 
@@ -9253,6 +9345,7 @@  rte_swx_pipeline_table_config(struct rte_swx_pipeline *p,
 
 	CHECK_NAME(name, EINVAL);
 	CHECK(!table_find(p, name), EEXIST);
+	CHECK(!selector_find(p, name), EEXIST);
 
 	CHECK(params, EINVAL);
 
@@ -9455,82 +9548,6 @@  table_params_free(struct rte_swx_table_params *params)
 	free(params);
 }
 
-static int
-table_state_build(struct rte_swx_pipeline *p)
-{
-	struct table *table;
-
-	p->table_state = calloc(p->n_tables,
-				sizeof(struct rte_swx_table_state));
-	CHECK(p->table_state, ENOMEM);
-
-	TAILQ_FOREACH(table, &p->tables, node) {
-		struct rte_swx_table_state *ts = &p->table_state[table->id];
-
-		if (table->type) {
-			struct rte_swx_table_params *params;
-
-			/* ts->obj. */
-			params = table_params_get(table);
-			CHECK(params, ENOMEM);
-
-			ts->obj = table->type->ops.create(params,
-				NULL,
-				table->args,
-				p->numa_node);
-
-			table_params_free(params);
-			CHECK(ts->obj, ENODEV);
-		}
-
-		/* ts->default_action_data. */
-		if (table->action_data_size_max) {
-			ts->default_action_data =
-				malloc(table->action_data_size_max);
-			CHECK(ts->default_action_data, ENOMEM);
-
-			memcpy(ts->default_action_data,
-			       table->default_action_data,
-			       table->action_data_size_max);
-		}
-
-		/* ts->default_action_id. */
-		ts->default_action_id = table->default_action->id;
-	}
-
-	return 0;
-}
-
-static void
-table_state_build_free(struct rte_swx_pipeline *p)
-{
-	uint32_t i;
-
-	if (!p->table_state)
-		return;
-
-	for (i = 0; i < p->n_tables; i++) {
-		struct rte_swx_table_state *ts = &p->table_state[i];
-		struct table *table = table_find_by_id(p, i);
-
-		/* ts->obj. */
-		if (table->type && ts->obj)
-			table->type->ops.free(ts->obj);
-
-		/* ts->default_action_data. */
-		free(ts->default_action_data);
-	}
-
-	free(p->table_state);
-	p->table_state = NULL;
-}
-
-static void
-table_state_free(struct rte_swx_pipeline *p)
-{
-	table_state_build_free(p);
-}
-
 static int
 table_stub_lkp(void *table __rte_unused,
 	       void *mailbox __rte_unused,
@@ -9658,6 +9675,458 @@  table_free(struct rte_swx_pipeline *p)
 	}
 }
 
+/*
+ * Selector.
+ */
+static struct selector *
+selector_find(struct rte_swx_pipeline *p, const char *name)
+{
+	struct selector *s;
+
+	TAILQ_FOREACH(s, &p->selectors, node)
+		if (strcmp(s->name, name) == 0)
+			return s;
+
+	return NULL;
+}
+
+static struct selector *
+selector_find_by_id(struct rte_swx_pipeline *p, uint32_t id)
+{
+	struct selector *s = NULL;
+
+	TAILQ_FOREACH(s, &p->selectors, node)
+		if (s->id == id)
+			return s;
+
+	return NULL;
+}
+
+static int
+selector_fields_check(struct rte_swx_pipeline *p,
+		      struct rte_swx_pipeline_selector_params *params,
+		      struct header **header)
+{
+	struct header *h0 = NULL;
+	struct field *hf, *mf;
+	uint32_t i;
+
+	/* Return if no selector fields. */
+	if (!params->n_selector_fields || !params->selector_field_names)
+		return -EINVAL;
+
+	/* Check that all the selector fields either belong to the same header
+	 * or are all meta-data fields.
+	 */
+	hf = header_field_parse(p, params->selector_field_names[0], &h0);
+	mf = metadata_field_parse(p, params->selector_field_names[0]);
+	if (!hf && !mf)
+		return -EINVAL;
+
+	for (i = 1; i < params->n_selector_fields; i++)
+		if (h0) {
+			struct header *h;
+
+			hf = header_field_parse(p, params->selector_field_names[i], &h);
+			if (!hf || (h->id != h0->id))
+				return -EINVAL;
+		} else {
+			mf = metadata_field_parse(p, params->selector_field_names[i]);
+			if (!mf)
+				return -EINVAL;
+		}
+
+	/* Check that there are no duplicated match fields. */
+	for (i = 0; i < params->n_selector_fields; i++) {
+		const char *field_name = params->selector_field_names[i];
+		uint32_t j;
+
+		for (j = i + 1; j < params->n_selector_fields; j++)
+			if (!strcmp(params->selector_field_names[j], field_name))
+				return -EINVAL;
+	}
+
+	/* Return. */
+	if (header)
+		*header = h0;
+
+	return 0;
+}
+
+int
+rte_swx_pipeline_selector_config(struct rte_swx_pipeline *p,
+				 const char *name,
+				 struct rte_swx_pipeline_selector_params *params)
+{
+	struct selector *s;
+	struct header *selector_header = NULL;
+	struct field *group_id_field, *member_id_field;
+	uint32_t i;
+	int status = 0;
+
+	CHECK(p, EINVAL);
+
+	CHECK_NAME(name, EINVAL);
+	CHECK(!table_find(p, name), EEXIST);
+	CHECK(!selector_find(p, name), EEXIST);
+
+	CHECK(params, EINVAL);
+
+	CHECK_NAME(params->group_id_field_name, EINVAL);
+	group_id_field = metadata_field_parse(p, params->group_id_field_name);
+	CHECK(group_id_field, EINVAL);
+
+	for (i = 0; i < params->n_selector_fields; i++) {
+		const char *field_name = params->selector_field_names[i];
+
+		CHECK_NAME(field_name, EINVAL);
+	}
+	status = selector_fields_check(p, params, &selector_header);
+	if (status)
+		return status;
+
+	CHECK_NAME(params->member_id_field_name, EINVAL);
+	member_id_field = metadata_field_parse(p, params->member_id_field_name);
+	CHECK(member_id_field, EINVAL);
+
+	CHECK(params->n_groups_max, EINVAL);
+
+	CHECK(params->n_members_per_group_max, EINVAL);
+
+	/* Memory allocation. */
+	s = calloc(1, sizeof(struct selector));
+	if (!s) {
+		status = -ENOMEM;
+		goto error;
+	}
+
+	s->selector_fields = calloc(params->n_selector_fields, sizeof(struct field *));
+	if (!s->selector_fields) {
+		status = -ENOMEM;
+		goto error;
+	}
+
+	/* Node initialization. */
+	strcpy(s->name, name);
+
+	s->group_id_field = group_id_field;
+
+	for (i = 0; i < params->n_selector_fields; i++) {
+		const char *field_name = params->selector_field_names[i];
+
+		s->selector_fields[i] = selector_header ?
+			header_field_parse(p, field_name, NULL) :
+			metadata_field_parse(p, field_name);
+	}
+
+	s->n_selector_fields = params->n_selector_fields;
+
+	s->selector_header = selector_header;
+
+	s->member_id_field = member_id_field;
+
+	s->n_groups_max = params->n_groups_max;
+
+	s->n_members_per_group_max = params->n_members_per_group_max;
+
+	s->id = p->n_selectors;
+
+	/* Node add to tailq. */
+	TAILQ_INSERT_TAIL(&p->selectors, s, node);
+	p->n_selectors++;
+
+	return 0;
+
+error:
+	if (!s)
+		return status;
+
+	free(s->selector_fields);
+
+	free(s);
+
+	return status;
+}
+
+static void
+selector_params_free(struct rte_swx_table_selector_params *params)
+{
+	if (!params)
+		return;
+
+	free(params->selector_mask);
+
+	free(params);
+}
+
+static struct rte_swx_table_selector_params *
+selector_table_params_get(struct selector *s)
+{
+	struct rte_swx_table_selector_params *params = NULL;
+	struct field *first, *last;
+	uint32_t i;
+
+	/* Memory allocation. */
+	params = calloc(1, sizeof(struct rte_swx_pipeline_selector_params));
+	if (!params)
+		goto error;
+
+	/* Group ID. */
+	params->group_id_offset = s->group_id_field->offset / 8;
+
+	/* Find first (smallest offset) and last (biggest offset) selector fields. */
+	first = s->selector_fields[0];
+	last = s->selector_fields[0];
+
+	for (i = 0; i < s->n_selector_fields; i++) {
+		struct field *f = s->selector_fields[i];
+
+		if (f->offset < first->offset)
+			first = f;
+
+		if (f->offset > last->offset)
+			last = f;
+	}
+
+	/* Selector offset and size. */
+	params->selector_offset = first->offset / 8;
+	params->selector_size = (last->offset + last->n_bits - first->offset) / 8;
+
+	/* Memory allocation. */
+	params->selector_mask = calloc(1, params->selector_size);
+	if (!params->selector_mask)
+		goto error;
+
+	/* Selector mask. */
+	for (i = 0; i < s->n_selector_fields; i++) {
+		struct field *f = s->selector_fields[i];
+		uint32_t start = (f->offset - first->offset) / 8;
+		size_t size = f->n_bits / 8;
+
+		memset(&params->selector_mask[start], 0xFF, size);
+	}
+
+	/* Member ID. */
+	params->member_id_offset = s->member_id_field->offset / 8;
+
+	/* Maximum number of groups. */
+	params->n_groups_max = s->n_groups_max;
+
+	/* Maximum number of members per group. */
+	params->n_members_per_group_max = s->n_members_per_group_max;
+
+	return params;
+
+error:
+	selector_params_free(params);
+	return NULL;
+}
+
+static void
+selector_build_free(struct rte_swx_pipeline *p)
+{
+	uint32_t i;
+
+	for (i = 0; i < RTE_SWX_PIPELINE_THREADS_MAX; i++) {
+		struct thread *t = &p->threads[i];
+		uint32_t j;
+
+		if (!t->selectors)
+			continue;
+
+		for (j = 0; j < p->n_selectors; j++) {
+			struct selector_runtime *r = &t->selectors[j];
+
+			free(r->mailbox);
+		}
+
+		free(t->selectors);
+		t->selectors = NULL;
+	}
+
+	free(p->selector_stats);
+	p->selector_stats = NULL;
+}
+
+static int
+selector_build(struct rte_swx_pipeline *p)
+{
+	uint32_t i;
+	int status = 0;
+
+	/* Per pipeline: selector statistics. */
+	p->selector_stats = calloc(p->n_selectors, sizeof(struct selector_statistics));
+	if (!p->selector_stats) {
+		status = -ENOMEM;
+		goto error;
+	}
+
+	/* Per thread: selector run-time. */
+	for (i = 0; i < RTE_SWX_PIPELINE_THREADS_MAX; i++) {
+		struct thread *t = &p->threads[i];
+		struct selector *s;
+
+		t->selectors = calloc(p->n_selectors, sizeof(struct selector_runtime));
+		if (!t->selectors) {
+			status = -ENOMEM;
+			goto error;
+		}
+
+		TAILQ_FOREACH(s, &p->selectors, node) {
+			struct selector_runtime *r = &t->selectors[s->id];
+			uint64_t size;
+
+			/* r->mailbox. */
+			size = rte_swx_table_selector_mailbox_size_get();
+			if (size) {
+				r->mailbox = calloc(1, size);
+				if (!r->mailbox) {
+					status = -ENOMEM;
+					goto error;
+				}
+			}
+
+			/* r->group_id_buffer. */
+			r->group_id_buffer = &t->structs[p->metadata_struct_id];
+
+			/* r->selector_buffer. */
+			r->selector_buffer = s->selector_header ?
+				&t->structs[s->selector_header->struct_id] :
+				&t->structs[p->metadata_struct_id];
+
+			/* r->member_id_buffer. */
+			r->member_id_buffer = &t->structs[p->metadata_struct_id];
+		}
+	}
+
+	return 0;
+
+error:
+	selector_build_free(p);
+	return status;
+}
+
+static void
+selector_free(struct rte_swx_pipeline *p)
+{
+	selector_build_free(p);
+
+	/* Selector tables. */
+	for ( ; ; ) {
+		struct selector *elem;
+
+		elem = TAILQ_FIRST(&p->selectors);
+		if (!elem)
+			break;
+
+		TAILQ_REMOVE(&p->selectors, elem, node);
+		free(elem->selector_fields);
+		free(elem);
+	}
+}
+
+/*
+ * Table state.
+ */
+static int
+table_state_build(struct rte_swx_pipeline *p)
+{
+	struct table *table;
+	struct selector *s;
+
+	p->table_state = calloc(p->n_tables + p->n_selectors,
+				sizeof(struct rte_swx_table_state));
+	CHECK(p->table_state, ENOMEM);
+
+	TAILQ_FOREACH(table, &p->tables, node) {
+		struct rte_swx_table_state *ts = &p->table_state[table->id];
+
+		if (table->type) {
+			struct rte_swx_table_params *params;
+
+			/* ts->obj. */
+			params = table_params_get(table);
+			CHECK(params, ENOMEM);
+
+			ts->obj = table->type->ops.create(params,
+				NULL,
+				table->args,
+				p->numa_node);
+
+			table_params_free(params);
+			CHECK(ts->obj, ENODEV);
+		}
+
+		/* ts->default_action_data. */
+		if (table->action_data_size_max) {
+			ts->default_action_data =
+				malloc(table->action_data_size_max);
+			CHECK(ts->default_action_data, ENOMEM);
+
+			memcpy(ts->default_action_data,
+			       table->default_action_data,
+			       table->action_data_size_max);
+		}
+
+		/* ts->default_action_id. */
+		ts->default_action_id = table->default_action->id;
+	}
+
+	TAILQ_FOREACH(s, &p->selectors, node) {
+		struct rte_swx_table_state *ts = &p->table_state[p->n_tables + s->id];
+		struct rte_swx_table_selector_params *params;
+
+		/* ts->obj. */
+		params = selector_table_params_get(s);
+		CHECK(params, ENOMEM);
+
+		ts->obj = rte_swx_table_selector_create(params, NULL, p->numa_node);
+
+		selector_params_free(params);
+		CHECK(ts->obj, ENODEV);
+	}
+
+	return 0;
+}
+
+static void
+table_state_build_free(struct rte_swx_pipeline *p)
+{
+	uint32_t i;
+
+	if (!p->table_state)
+		return;
+
+	for (i = 0; i < p->n_tables; i++) {
+		struct rte_swx_table_state *ts = &p->table_state[i];
+		struct table *table = table_find_by_id(p, i);
+
+		/* ts->obj. */
+		if (table->type && ts->obj)
+			table->type->ops.free(ts->obj);
+
+		/* ts->default_action_data. */
+		free(ts->default_action_data);
+	}
+
+	for (i = 0; i < p->n_selectors; i++) {
+		struct rte_swx_table_state *ts = &p->table_state[p->n_tables + i];
+
+		/* ts->obj. */
+		if (ts->obj)
+			rte_swx_table_selector_free(ts->obj);
+	}
+
+	free(p->table_state);
+	p->table_state = NULL;
+}
+
+static void
+table_state_free(struct rte_swx_pipeline *p)
+{
+	table_state_build_free(p);
+}
+
 /*
  * Register array.
  */
@@ -9988,6 +10457,7 @@  rte_swx_pipeline_config(struct rte_swx_pipeline **p, int numa_node)
 	TAILQ_INIT(&pipeline->actions);
 	TAILQ_INIT(&pipeline->table_types);
 	TAILQ_INIT(&pipeline->tables);
+	TAILQ_INIT(&pipeline->selectors);
 	TAILQ_INIT(&pipeline->regarrays);
 	TAILQ_INIT(&pipeline->meter_profiles);
 	TAILQ_INIT(&pipeline->metarrays);
@@ -10010,6 +10480,7 @@  rte_swx_pipeline_free(struct rte_swx_pipeline *p)
 	metarray_free(p);
 	regarray_free(p);
 	table_state_free(p);
+	selector_free(p);
 	table_free(p);
 	action_free(p);
 	metadata_free(p);
@@ -10089,6 +10560,10 @@  rte_swx_pipeline_build(struct rte_swx_pipeline *p)
 	if (status)
 		goto error;
 
+	status = selector_build(p);
+	if (status)
+		goto error;
+
 	status = table_state_build(p);
 	if (status)
 		goto error;
@@ -10108,6 +10583,7 @@  rte_swx_pipeline_build(struct rte_swx_pipeline *p)
 	metarray_build_free(p);
 	regarray_build_free(p);
 	table_state_build_free(p);
+	selector_build_free(p);
 	table_build_free(p);
 	action_build_free(p);
 	metadata_build_free(p);
@@ -10167,6 +10643,7 @@  rte_swx_ctl_pipeline_info_get(struct rte_swx_pipeline *p,
 	pipeline->n_ports_out = p->n_ports_out;
 	pipeline->n_actions = n_actions;
 	pipeline->n_tables = n_tables;
+	pipeline->n_selectors = p->n_selectors;
 	pipeline->n_regarrays = p->n_regarrays;
 	pipeline->n_metarrays = p->n_metarrays;
 
@@ -10320,6 +10797,98 @@  rte_swx_ctl_table_ops_get(struct rte_swx_pipeline *p,
 	return 0;
 }
 
+int
+rte_swx_ctl_selector_info_get(struct rte_swx_pipeline *p,
+			      uint32_t selector_id,
+			      struct rte_swx_ctl_selector_info *selector)
+{
+	struct selector *s = NULL;
+
+	if (!p || !selector)
+		return -EINVAL;
+
+	s = selector_find_by_id(p, selector_id);
+	if (!s)
+		return -EINVAL;
+
+	strcpy(selector->name, s->name);
+
+	selector->n_selector_fields = s->n_selector_fields;
+	selector->n_groups_max = s->n_groups_max;
+	selector->n_members_per_group_max = s->n_members_per_group_max;
+
+	return 0;
+}
+
+int
+rte_swx_ctl_selector_group_id_field_info_get(struct rte_swx_pipeline *p,
+	 uint32_t selector_id,
+	 struct rte_swx_ctl_table_match_field_info *field)
+{
+	struct selector *s;
+
+	if (!p || (selector_id >= p->n_selectors) || !field)
+		return -EINVAL;
+
+	s = selector_find_by_id(p, selector_id);
+	if (!s)
+		return -EINVAL;
+
+	field->match_type = RTE_SWX_TABLE_MATCH_EXACT;
+	field->is_header = 0;
+	field->n_bits = s->group_id_field->n_bits;
+	field->offset = s->group_id_field->offset;
+
+	return 0;
+}
+
+int
+rte_swx_ctl_selector_field_info_get(struct rte_swx_pipeline *p,
+	 uint32_t selector_id,
+	 uint32_t selector_field_id,
+	 struct rte_swx_ctl_table_match_field_info *field)
+{
+	struct selector *s;
+	struct field *f;
+
+	if (!p || (selector_id >= p->n_selectors) || !field)
+		return -EINVAL;
+
+	s = selector_find_by_id(p, selector_id);
+	if (!s || (selector_field_id >= s->n_selector_fields))
+		return -EINVAL;
+
+	f = s->selector_fields[selector_field_id];
+	field->match_type = RTE_SWX_TABLE_MATCH_EXACT;
+	field->is_header = s->selector_header ? 1 : 0;
+	field->n_bits = f->n_bits;
+	field->offset = f->offset;
+
+	return 0;
+}
+
+int
+rte_swx_ctl_selector_member_id_field_info_get(struct rte_swx_pipeline *p,
+	 uint32_t selector_id,
+	 struct rte_swx_ctl_table_match_field_info *field)
+{
+	struct selector *s;
+
+	if (!p || (selector_id >= p->n_selectors) || !field)
+		return -EINVAL;
+
+	s = selector_find_by_id(p, selector_id);
+	if (!s)
+		return -EINVAL;
+
+	field->match_type = RTE_SWX_TABLE_MATCH_EXACT;
+	field->is_header = 0;
+	field->n_bits = s->member_id_field->n_bits;
+	field->offset = s->member_id_field->offset;
+
+	return 0;
+}
+
 int
 rte_swx_pipeline_table_state_get(struct rte_swx_pipeline *p,
 				 struct rte_swx_table_state **table_state)
@@ -10405,6 +10974,25 @@  rte_swx_ctl_pipeline_table_stats_read(struct rte_swx_pipeline *p,
 	return 0;
 }
 
+int
+rte_swx_ctl_pipeline_selector_stats_read(struct rte_swx_pipeline *p,
+	const char *selector_name,
+	struct rte_swx_pipeline_selector_stats *stats)
+{
+	struct selector *s;
+
+	if (!p || !selector_name || !selector_name[0] || !stats)
+		return -EINVAL;
+
+	s = selector_find(p, selector_name);
+	if (!s)
+		return -EINVAL;
+
+	stats->n_pkts = p->selector_stats[s->id].n_pkts;
+
+	return 0;
+}
+
 int
 rte_swx_ctl_regarray_info_get(struct rte_swx_pipeline *p,
 			      uint32_t regarray_id,
diff --git a/lib/pipeline/rte_swx_pipeline.h b/lib/pipeline/rte_swx_pipeline.h
index feeb10a5c..cd395ac39 100644
--- a/lib/pipeline/rte_swx_pipeline.h
+++ b/lib/pipeline/rte_swx_pipeline.h
@@ -612,6 +612,57 @@  rte_swx_pipeline_table_config(struct rte_swx_pipeline *p,
 			      const char *args,
 			      uint32_t size);
 
+/** Pipeline selector table parameters. */
+struct rte_swx_pipeline_selector_params {
+	/** The group ID field. Input into the selection operation.
+	 * Restriction: This field must be a meta-data field.
+	 */
+	const char *group_id_field_name;
+
+	/** The set of fields used to select (through a hashing scheme) the
+	 * member within the current group. Inputs into the seletion operation.
+	 * Restriction: All the selector fields must be part of the same struct,
+	 * i.e. part of the same header or part of the meta-data structure.
+	 */
+	const char **selector_field_names;
+
+	/** The number of selector fields. Must be non-zero. */
+	uint32_t n_selector_fields;
+
+	/** The member ID field. Output from the selection operation.
+	 * Restriction: This field must be a meta-data field.
+	 */
+	const char *member_id_field_name;
+
+	/** Maximum number of groups. Must be non-zero. */
+	uint32_t n_groups_max;
+
+	/** Maximum number of members per group. Must be non-zero. */
+	uint32_t n_members_per_group_max;
+};
+
+/**
+ * Pipeline selector table configure
+ *
+ * @param[out] p
+ *   Pipeline handle.
+ * @param[in] name
+ *   Selector table name.
+ * @param[in] params
+ *   Selector table parameters.
+ * @return
+ *   0 on success or the following error codes otherwise:
+ *   -EINVAL: Invalid argument;
+ *   -ENOMEM: Not enough space/cannot allocate memory;
+ *   -EEXIST: Selector table with this name already exists;
+ *   -ENODEV: Selector table creation error.
+ */
+__rte_experimental
+int
+rte_swx_pipeline_selector_config(struct rte_swx_pipeline *p,
+				 const char *name,
+				 struct rte_swx_pipeline_selector_params *params);
+
 /**
  * Pipeline register array configure
  *
diff --git a/lib/pipeline/rte_swx_pipeline_spec.c b/lib/pipeline/rte_swx_pipeline_spec.c
index 2e867d7bf..6980b0390 100644
--- a/lib/pipeline/rte_swx_pipeline_spec.c
+++ b/lib/pipeline/rte_swx_pipeline_spec.c
@@ -18,7 +18,9 @@ 
 #define TABLE_BLOCK 2
 #define TABLE_KEY_BLOCK 3
 #define TABLE_ACTIONS_BLOCK 4
-#define APPLY_BLOCK 5
+#define SELECTOR_BLOCK 5
+#define SELECTOR_SELECTOR_BLOCK 6
+#define APPLY_BLOCK 7
 
 /*
  * extobj.
@@ -940,6 +942,307 @@  table_block_parse(struct table_spec *s,
 	return -EINVAL;
 }
 
+/*
+ * selector.
+ *
+ * selector SELECTOR_NAME {
+ *	group_id FIELD_NAME
+ *	selector {
+ *		FIELD_NAME
+ *		...
+ *	}
+ *	member_id FIELD_NAME
+ *	n_groups N_GROUPS
+ *	n_members_per_group N_MEMBERS_PER_GROUP
+ * }
+ */
+struct selector_spec {
+	char *name;
+	struct rte_swx_pipeline_selector_params params;
+};
+
+static void
+selector_spec_free(struct selector_spec *s)
+{
+	uintptr_t field_name;
+	uint32_t i;
+
+	if (!s)
+		return;
+
+	/* name. */
+	free(s->name);
+	s->name = NULL;
+
+	/* params->group_id_field_name. */
+	field_name = (uintptr_t)s->params.group_id_field_name;
+	free((void *)field_name);
+	s->params.group_id_field_name = NULL;
+
+	/* params->selector_field_names. */
+	for (i = 0; i < s->params.n_selector_fields; i++) {
+		field_name = (uintptr_t)s->params.selector_field_names[i];
+
+		free((void *)field_name);
+	}
+
+	free(s->params.selector_field_names);
+	s->params.selector_field_names = NULL;
+
+	s->params.n_selector_fields = 0;
+
+	/* params->member_id_field_name. */
+	field_name = (uintptr_t)s->params.member_id_field_name;
+	free((void *)field_name);
+	s->params.member_id_field_name = NULL;
+
+	/* params->n_groups_max. */
+	s->params.n_groups_max = 0;
+
+	/* params->n_members_per_group_max. */
+	s->params.n_members_per_group_max = 0;
+}
+
+static int
+selector_statement_parse(struct selector_spec *s,
+			 uint32_t *block_mask,
+			 char **tokens,
+			 uint32_t n_tokens,
+			 uint32_t n_lines,
+			 uint32_t *err_line,
+			 const char **err_msg)
+{
+	/* Check format. */
+	if ((n_tokens != 3) || strcmp(tokens[2], "{")) {
+		if (err_line)
+			*err_line = n_lines;
+		if (err_msg)
+			*err_msg = "Invalid selector statement.";
+		return -EINVAL;
+	}
+
+	/* spec. */
+	s->name = strdup(tokens[1]);
+	if (!s->name) {
+		if (err_line)
+			*err_line = n_lines;
+		if (err_msg)
+			*err_msg = "Memory allocation failed.";
+		return -ENOMEM;
+	}
+
+	/* block_mask. */
+	*block_mask |= 1 << SELECTOR_BLOCK;
+
+	return 0;
+}
+
+static int
+selector_selector_statement_parse(uint32_t *block_mask,
+				  char **tokens,
+				  uint32_t n_tokens,
+				  uint32_t n_lines,
+				  uint32_t *err_line,
+				  const char **err_msg)
+{
+	/* Check format. */
+	if ((n_tokens != 2) || strcmp(tokens[1], "{")) {
+		if (err_line)
+			*err_line = n_lines;
+		if (err_msg)
+			*err_msg = "Invalid selector statement.";
+		return -EINVAL;
+	}
+
+	/* block_mask. */
+	*block_mask |= 1 << SELECTOR_SELECTOR_BLOCK;
+
+	return 0;
+}
+
+static int
+selector_selector_block_parse(struct selector_spec *s,
+			      uint32_t *block_mask,
+			      char **tokens,
+			      uint32_t n_tokens,
+			      uint32_t n_lines,
+			      uint32_t *err_line,
+			      const char **err_msg)
+{
+	const char **new_fields;
+	char *name;
+
+	/* Handle end of block. */
+	if ((n_tokens == 1) && !strcmp(tokens[0], "}")) {
+		*block_mask &= ~(1 << SELECTOR_SELECTOR_BLOCK);
+		return 0;
+	}
+
+	/* Check input arguments. */
+	if (n_tokens != 1) {
+		if (err_line)
+			*err_line = n_lines;
+		if (err_msg)
+			*err_msg = "Invalid selector field statement.";
+		return -EINVAL;
+	}
+
+	name = strdup(tokens[0]);
+	if (!name) {
+		if (err_line)
+			*err_line = n_lines;
+		if (err_msg)
+			*err_msg = "Memory allocation failed.";
+		return -ENOMEM;
+	}
+
+	new_fields = realloc(s->params.selector_field_names,
+			     (s->params.n_selector_fields + 1) * sizeof(char *));
+	if (!new_fields) {
+		free(name);
+
+		if (err_line)
+			*err_line = n_lines;
+		if (err_msg)
+			*err_msg = "Memory allocation failed.";
+		return -ENOMEM;
+	}
+
+	s->params.selector_field_names = new_fields;
+	s->params.selector_field_names[s->params.n_selector_fields] = name;
+	s->params.n_selector_fields++;
+
+	return 0;
+}
+
+static int
+selector_block_parse(struct selector_spec *s,
+		     uint32_t *block_mask,
+		     char **tokens,
+		     uint32_t n_tokens,
+		     uint32_t n_lines,
+		     uint32_t *err_line,
+		     const char **err_msg)
+{
+	if (*block_mask & (1 << SELECTOR_SELECTOR_BLOCK))
+		return selector_selector_block_parse(s,
+						     block_mask,
+						     tokens,
+						     n_tokens,
+						     n_lines,
+						     err_line,
+						     err_msg);
+
+	/* Handle end of block. */
+	if ((n_tokens == 1) && !strcmp(tokens[0], "}")) {
+		*block_mask &= ~(1 << SELECTOR_BLOCK);
+		return 0;
+	}
+
+	if (!strcmp(tokens[0], "group_id")) {
+		if (n_tokens != 2) {
+			if (err_line)
+				*err_line = n_lines;
+			if (err_msg)
+				*err_msg = "Invalid group_id statement.";
+			return -EINVAL;
+		}
+
+		s->params.group_id_field_name = strdup(tokens[1]);
+		if (!s->params.group_id_field_name) {
+			if (err_line)
+				*err_line = n_lines;
+			if (err_msg)
+				*err_msg = "Memory allocation failed.";
+			return -ENOMEM;
+		}
+
+		return 0;
+	}
+
+	if (!strcmp(tokens[0], "selector"))
+		return selector_selector_statement_parse(block_mask,
+							 tokens,
+							 n_tokens,
+							 n_lines,
+							 err_line,
+							 err_msg);
+
+	if (!strcmp(tokens[0], "member_id")) {
+		if (n_tokens != 2) {
+			if (err_line)
+				*err_line = n_lines;
+			if (err_msg)
+				*err_msg = "Invalid member_id statement.";
+			return -EINVAL;
+		}
+
+		s->params.member_id_field_name = strdup(tokens[1]);
+		if (!s->params.member_id_field_name) {
+			if (err_line)
+				*err_line = n_lines;
+			if (err_msg)
+				*err_msg = "Memory allocation failed.";
+			return -ENOMEM;
+		}
+
+		return 0;
+	}
+
+	if (!strcmp(tokens[0], "n_groups_max")) {
+		char *p = tokens[1];
+
+		if (n_tokens != 2) {
+			if (err_line)
+				*err_line = n_lines;
+			if (err_msg)
+				*err_msg = "Invalid n_groups statement.";
+			return -EINVAL;
+		}
+
+		s->params.n_groups_max = strtoul(p, &p, 0);
+		if (p[0]) {
+			if (err_line)
+				*err_line = n_lines;
+			if (err_msg)
+				*err_msg = "Invalid n_groups argument.";
+			return -EINVAL;
+		}
+
+		return 0;
+	}
+
+	if (!strcmp(tokens[0], "n_members_per_group_max")) {
+		char *p = tokens[1];
+
+		if (n_tokens != 2) {
+			if (err_line)
+				*err_line = n_lines;
+			if (err_msg)
+				*err_msg = "Invalid n_members_per_group statement.";
+			return -EINVAL;
+		}
+
+		s->params.n_members_per_group_max = strtoul(p, &p, 0);
+		if (p[0]) {
+			if (err_line)
+				*err_line = n_lines;
+			if (err_msg)
+				*err_msg = "Invalid n_members_per_group argument.";
+			return -EINVAL;
+		}
+
+		return 0;
+	}
+
+	/* Anything else. */
+	if (err_line)
+		*err_line = n_lines;
+	if (err_msg)
+		*err_msg = "Invalid statement.";
+	return -EINVAL;
+}
+
 /*
  * regarray.
  *
@@ -1203,6 +1506,7 @@  rte_swx_pipeline_build_from_spec(struct rte_swx_pipeline *p,
 	struct metadata_spec metadata_spec = {0};
 	struct action_spec action_spec = {0};
 	struct table_spec table_spec = {0};
+	struct selector_spec selector_spec = {0};
 	struct regarray_spec regarray_spec = {0};
 	struct metarray_spec metarray_spec = {0};
 	struct apply_spec apply_spec = {0};
@@ -1386,6 +1690,38 @@  rte_swx_pipeline_build_from_spec(struct rte_swx_pipeline *p,
 			continue;
 		}
 
+		/* selector block. */
+		if (block_mask & (1 << SELECTOR_BLOCK)) {
+			status = selector_block_parse(&selector_spec,
+						      &block_mask,
+						      tokens,
+						      n_tokens,
+						      n_lines,
+						      err_line,
+						      err_msg);
+			if (status)
+				goto error;
+
+			if (block_mask & (1 << SELECTOR_BLOCK))
+				continue;
+
+			/* End of block. */
+			status = rte_swx_pipeline_selector_config(p,
+				selector_spec.name,
+				&selector_spec.params);
+			if (status) {
+				if (err_line)
+					*err_line = n_lines;
+				if (err_msg)
+					*err_msg = "Selector configuration error.";
+				goto error;
+			}
+
+			selector_spec_free(&selector_spec);
+
+			continue;
+		}
+
 		/* apply block. */
 		if (block_mask & (1 << APPLY_BLOCK)) {
 			status = apply_block_parse(&apply_spec,
@@ -1544,6 +1880,21 @@  rte_swx_pipeline_build_from_spec(struct rte_swx_pipeline *p,
 			continue;
 		}
 
+		/* selector. */
+		if (!strcmp(tokens[0], "selector")) {
+			status = selector_statement_parse(&selector_spec,
+							  &block_mask,
+							  tokens,
+							  n_tokens,
+							  n_lines,
+							  err_line,
+							  err_msg);
+			if (status)
+				goto error;
+
+			continue;
+		}
+
 		/* regarray. */
 		if (!strcmp(tokens[0], "regarray")) {
 			status = regarray_statement_parse(&regarray_spec,
@@ -1651,6 +2002,7 @@  rte_swx_pipeline_build_from_spec(struct rte_swx_pipeline *p,
 	metadata_spec_free(&metadata_spec);
 	action_spec_free(&action_spec);
 	table_spec_free(&table_spec);
+	selector_spec_free(&selector_spec);
 	regarray_spec_free(&regarray_spec);
 	metarray_spec_free(&metarray_spec);
 	apply_spec_free(&apply_spec);
diff --git a/lib/pipeline/version.map b/lib/pipeline/version.map
index a4d7d9788..ff0974c2e 100644
--- a/lib/pipeline/version.map
+++ b/lib/pipeline/version.map
@@ -116,4 +116,17 @@  EXPERIMENTAL {
 	rte_swx_ctl_regarray_info_get;
 	rte_swx_pipeline_metarray_config;
 	rte_swx_pipeline_regarray_config;
+
+	#added in 21.08
+	rte_swx_pipeline_selector_config;
+	rte_swx_ctl_pipeline_selector_fprintf;
+	rte_swx_ctl_pipeline_selector_group_add;
+	rte_swx_ctl_pipeline_selector_group_delete;
+	rte_swx_ctl_pipeline_selector_group_member_add;
+	rte_swx_ctl_pipeline_selector_group_member_delete;
+	rte_swx_ctl_pipeline_selector_stats_read;
+	rte_swx_ctl_selector_info_get;
+	rte_swx_ctl_selector_field_info_get;
+	rte_swx_ctl_selector_group_id_field_info_get;
+	rte_swx_ctl_selector_member_id_field_info_get;
 };