[dpdk-dev] [PATCH v3 7/9] rte_lpm: make lpm tailq fully local

[Anatoly Burakov <anatoly.burakov@intel.com>]

Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
---
 lib/librte_lpm/rte_lpm.c | 65 ++++++++++++++++++++++++++++++++++++++++--------
 lib/librte_lpm/rte_lpm.h |  2 --
 2 files changed, 54 insertions(+), 13 deletions(-)

diff --git a/lib/librte_lpm/rte_lpm.c b/lib/librte_lpm/rte_lpm.c
index 592750e..6a49d43 100644
--- a/lib/librte_lpm/rte_lpm.c
+++ b/lib/librte_lpm/rte_lpm.c
@@ -56,7 +56,7 @@
 
 #include "rte_lpm.h"
 
-TAILQ_HEAD(rte_lpm_list, rte_lpm);
+TAILQ_HEAD(rte_lpm_list, rte_tailq_entry);
 
 #define MAX_DEPTH_TBL24 24
 
@@ -118,24 +118,29 @@ depth_to_range(uint8_t depth)
 struct rte_lpm *
 rte_lpm_find_existing(const char *name)
 {
-	struct rte_lpm *l;
+	struct rte_lpm *l = NULL;
+	struct rte_tailq_entry *te;
 	struct rte_lpm_list *lpm_list;
 
 	/* check that we have an initialised tail queue */
-	if ((lpm_list = RTE_TAILQ_LOOKUP_BY_IDX(RTE_TAILQ_LPM, rte_lpm_list)) == NULL) {
+	if ((lpm_list = RTE_TAILQ_LOOKUP_BY_IDX(RTE_TAILQ_LPM,
+			rte_lpm_list)) == NULL) {
 		rte_errno = E_RTE_NO_TAILQ;
 		return NULL;
 	}
 
 	rte_rwlock_read_lock(RTE_EAL_TAILQ_RWLOCK);
-	TAILQ_FOREACH(l, lpm_list, next) {
+	TAILQ_FOREACH(te, lpm_list, next) {
+		l = (struct rte_lpm *) te->data;
 		if (strncmp(name, l->name, RTE_LPM_NAMESIZE) == 0)
 			break;
 	}
 	rte_rwlock_read_unlock(RTE_EAL_TAILQ_RWLOCK);
 
-	if (l == NULL)
+	if (te == NULL) {
 		rte_errno = ENOENT;
+		return NULL;
+	}
 
 	return l;
 }
@@ -149,12 +154,13 @@ rte_lpm_create(const char *name, int socket_id, int max_rules,
 {
 	char mem_name[RTE_LPM_NAMESIZE];
 	struct rte_lpm *lpm = NULL;
+	struct rte_tailq_entry *te;
 	uint32_t mem_size;
 	struct rte_lpm_list *lpm_list;
 
 	/* check that we have an initialised tail queue */
-	if ((lpm_list =
-	     RTE_TAILQ_LOOKUP_BY_IDX(RTE_TAILQ_LPM, rte_lpm_list)) == NULL) {
+	if ((lpm_list = RTE_TAILQ_LOOKUP_BY_IDX(RTE_TAILQ_LPM,
+			rte_lpm_list)) == NULL) {
 		rte_errno = E_RTE_NO_TAILQ;
 		return NULL;
 	}
@@ -176,18 +182,27 @@ rte_lpm_create(const char *name, int socket_id, int max_rules,
 	rte_rwlock_write_lock(RTE_EAL_TAILQ_RWLOCK);
 
 	/* guarantee there's no existing */
-	TAILQ_FOREACH(lpm, lpm_list, next) {
+	TAILQ_FOREACH(te, lpm_list, next) {
+		lpm = (struct rte_lpm *) te->data;
 		if (strncmp(name, lpm->name, RTE_LPM_NAMESIZE) == 0)
 			break;
 	}
-	if (lpm != NULL)
+	if (te != NULL)
 		goto exit;
 
+	/* allocate tailq entry */
+	te = rte_zmalloc("LPM_TAILQ_ENTRY", sizeof(*te), 0);
+	if (te == NULL) {
+		RTE_LOG(ERR, LPM, "Failed to allocate tailq entry\n");
+		goto exit;
+	}
+
 	/* Allocate memory to store the LPM data structures. */
 	lpm = (struct rte_lpm *)rte_zmalloc_socket(mem_name, mem_size,
 			CACHE_LINE_SIZE, socket_id);
 	if (lpm == NULL) {
 		RTE_LOG(ERR, LPM, "LPM memory allocation failed\n");
+		rte_free(te);
 		goto exit;
 	}
 
@@ -195,7 +210,9 @@ rte_lpm_create(const char *name, int socket_id, int max_rules,
 	lpm->max_rules = max_rules;
 	rte_snprintf(lpm->name, sizeof(lpm->name), "%s", name);
 
-	TAILQ_INSERT_TAIL(lpm_list, lpm, next);
+	te->data = (void *) lpm;
+
+	TAILQ_INSERT_TAIL(lpm_list, te, next);
 
 exit:
 	rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
@@ -209,12 +226,38 @@ exit:
 void
 rte_lpm_free(struct rte_lpm *lpm)
 {
+	struct rte_lpm_list *lpm_list;
+	struct rte_tailq_entry *te;
+
 	/* Check user arguments. */
 	if (lpm == NULL)
 		return;
 
-	RTE_EAL_TAILQ_REMOVE(RTE_TAILQ_LPM, rte_lpm_list, lpm);
+	/* check that we have an initialised tail queue */
+	if ((lpm_list =
+	     RTE_TAILQ_LOOKUP_BY_IDX(RTE_TAILQ_LPM, rte_lpm_list)) == NULL) {
+		rte_errno = E_RTE_NO_TAILQ;
+		return;
+	}
+
+	rte_rwlock_write_lock(RTE_EAL_TAILQ_RWLOCK);
+
+	/* find our tailq entry */
+	TAILQ_FOREACH(te, lpm_list, next) {
+		if (te->data == (void *) lpm)
+			break;
+	}
+	if (te == NULL) {
+		rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
+		return;
+	}
+
+	TAILQ_REMOVE(lpm_list, te, next);
+
+	rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
+
 	rte_free(lpm);
+	rte_free(te);
 }
 
 /*
diff --git a/lib/librte_lpm/rte_lpm.h b/lib/librte_lpm/rte_lpm.h
index d35565d..308f5ef 100644
--- a/lib/librte_lpm/rte_lpm.h
+++ b/lib/librte_lpm/rte_lpm.h
@@ -132,8 +132,6 @@ struct rte_lpm_rule_info {
 
 /** @internal LPM structure. */
 struct rte_lpm {
-	TAILQ_ENTRY(rte_lpm) next;      /**< Next in list. */
-
 	/* LPM metadata. */
 	char name[RTE_LPM_NAMESIZE];        /**< Name of the lpm. */
 	int mem_location; /**< @deprecated @see RTE_LPM_HEAP and RTE_LPM_MEMZONE. */
-- 
1.8.1.4