[dpdk-dev] [PATCH v6 1/2] librte_lpm: Improve performance of the delete and add functions

[dpdk-dev] [PATCH v6 1/2] librte_lpm: Improve performance of the delete and add functions

[Alex Kiselev]

librte_lpm: Improve lpm6 performance

Rework the lpm6 rule subsystem and replace
current rules algorithm complexity O(n)
with hashtables which allow dealing with
large (50k) rule sets.

Signed-off-by: Alex Kiselev <alex@therouter.net>
---
 lib/Makefile               |   2 +-
 lib/librte_lpm/Makefile    |   2 +-
 lib/librte_lpm/meson.build |   1 +
 lib/librte_lpm/rte_lpm6.c  | 368 +++++++++++++++++++++++++--------------------
 4 files changed, 210 insertions(+), 163 deletions(-)

diff --git a/lib/Makefile b/lib/Makefile
index d82462ba2..070104657 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -47,7 +47,7 @@ DEPDIRS-librte_hash := librte_eal librte_ring
 DIRS-$(CONFIG_RTE_LIBRTE_EFD) += librte_efd
 DEPDIRS-librte_efd := librte_eal librte_ring librte_hash
 DIRS-$(CONFIG_RTE_LIBRTE_LPM) += librte_lpm
-DEPDIRS-librte_lpm := librte_eal
+DEPDIRS-librte_lpm := librte_eal librte_hash
 DIRS-$(CONFIG_RTE_LIBRTE_ACL) += librte_acl
 DEPDIRS-librte_acl := librte_eal
 DIRS-$(CONFIG_RTE_LIBRTE_MEMBER) += librte_member
diff --git a/lib/librte_lpm/Makefile b/lib/librte_lpm/Makefile
index 482bd72e9..a7946a1c5 100644
--- a/lib/librte_lpm/Makefile
+++ b/lib/librte_lpm/Makefile
@@ -8,7 +8,7 @@ LIB = librte_lpm.a
 
 CFLAGS += -O3
 CFLAGS += $(WERROR_FLAGS) -I$(SRCDIR)
-LDLIBS += -lrte_eal
+LDLIBS += -lrte_eal -lrte_hash
 
 EXPORT_MAP := rte_lpm_version.map
 
diff --git a/lib/librte_lpm/meson.build b/lib/librte_lpm/meson.build
index 067849427..a5176d8ae 100644
--- a/lib/librte_lpm/meson.build
+++ b/lib/librte_lpm/meson.build
@@ -7,3 +7,4 @@ headers = files('rte_lpm.h', 'rte_lpm6.h')
 # since header files have different names, we can install all vector headers
 # without worrying about which architecture we actually need
 headers += files('rte_lpm_altivec.h', 'rte_lpm_neon.h', 'rte_lpm_sse.h')
+deps += ['hash']
diff --git a/lib/librte_lpm/rte_lpm6.c b/lib/librte_lpm/rte_lpm6.c
index 149677eb1..d86e878bc 100644
--- a/lib/librte_lpm/rte_lpm6.c
+++ b/lib/librte_lpm/rte_lpm6.c
@@ -21,6 +21,9 @@
 #include <rte_errno.h>
 #include <rte_rwlock.h>
 #include <rte_spinlock.h>
+#include <rte_hash.h>
+#include <assert.h>
+#include <rte_jhash.h>
 
 #include "rte_lpm6.h"
 
@@ -37,6 +40,8 @@
 #define BYTE_SIZE                                 8
 #define BYTES2_SIZE                              16
 
+#define RULE_HASH_TABLE_EXTRA_SPACE              64
+
 #define lpm6_tbl8_gindex next_hop
 
 /** Flags for setting an entry as valid/invalid. */
@@ -70,6 +75,12 @@ struct rte_lpm6_rule {
 	uint8_t depth; /**< Rule depth. */
 };
 
+/** Rules tbl entry key. */
+struct rte_lpm6_rule_key {
+	uint8_t ip[RTE_LPM6_IPV6_ADDR_SIZE]; /**< Rule IP address. */
+	uint8_t depth; /**< Rule depth. */
+};
+
 /** LPM6 structure. */
 struct rte_lpm6 {
 	/* LPM metadata. */
@@ -80,7 +91,7 @@ struct rte_lpm6 {
 	uint32_t next_tbl8;              /**< Next tbl8 to be used. */
 
 	/* LPM Tables. */
-	struct rte_lpm6_rule *rules_tbl; /**< LPM rules. */
+	struct rte_hash *rules_tbl; /**< LPM rules. */
 	struct rte_lpm6_tbl_entry tbl24[RTE_LPM6_TBL24_NUM_ENTRIES]
 			__rte_cache_aligned; /**< LPM tbl24 table. */
 	struct rte_lpm6_tbl_entry tbl8[0]
@@ -93,22 +104,69 @@ struct rte_lpm6 {
  * and set the rest to 0.
  */
 static inline void
-mask_ip(uint8_t *ip, uint8_t depth)
+ip6_mask_addr(uint8_t *ip, uint8_t depth)
 {
-        int16_t part_depth, mask;
-        int i;
+	int16_t part_depth, mask;
+	int i;
 
-		part_depth = depth;
+	part_depth = depth;
 
-		for (i = 0; i < RTE_LPM6_IPV6_ADDR_SIZE; i++) {
-			if (part_depth < BYTE_SIZE && part_depth >= 0) {
-				mask = (uint16_t)(~(UINT8_MAX >> part_depth));
-				ip[i] = (uint8_t)(ip[i] & mask);
-			} else if (part_depth < 0) {
-				ip[i] = 0;
-			}
-			part_depth -= BYTE_SIZE;
-		}
+	for (i = 0; i < RTE_LPM6_IPV6_ADDR_SIZE; i++) {
+		if (part_depth < BYTE_SIZE && part_depth >= 0) {
+			mask = (uint16_t)(~(UINT8_MAX >> part_depth));
+			ip[i] = (uint8_t)(ip[i] & mask);
+		} else if (part_depth < 0)
+			ip[i] = 0;
+
+		part_depth -= BYTE_SIZE;
+	}
+}
+
+/* copy ipv6 address */
+static inline void
+ip6_copy_addr(uint8_t *dst, const uint8_t *src)
+{
+	rte_memcpy(dst, src, RTE_LPM6_IPV6_ADDR_SIZE);
+}
+
+/*
+ * LPM6 rule hash function
+ *
+ * It's used as a hash function for the rte_hash
+ *	containing rules
+ */
+static inline uint32_t
+rule_hash(const void *data, __rte_unused uint32_t data_len,
+		  uint32_t init_val)
+{
+	return rte_jhash(data, sizeof(struct rte_lpm6_rule_key), init_val);
+}
+
+/*
+ * Init a rule key.
+ *	  note that ip must be already masked
+ */
+static inline void
+rule_key_init(struct rte_lpm6_rule_key *key, uint8_t *ip, uint8_t depth)
+{
+	ip6_copy_addr(key->ip, ip);
+	key->depth = depth;
+}
+
+/*
+ * Rebuild the entire LPM tree by reinserting all rules
+ */
+static void
+rebuild_lpm(struct rte_lpm6 *lpm)
+{
+	uint64_t next_hop;
+	struct rte_lpm6_rule_key *rule_key;
+	uint32_t iter = 0;
+
+	while (rte_hash_iterate(lpm->rules_tbl, (void *) &rule_key,
+			(void **) &next_hop, &iter) >= 0)
+		rte_lpm6_add(lpm, rule_key->ip, rule_key->depth,
+			(uint32_t) next_hop);
 }
 
 /*
@@ -121,8 +179,9 @@ rte_lpm6_create(const char *name, int socket_id,
 	char mem_name[RTE_LPM6_NAMESIZE];
 	struct rte_lpm6 *lpm = NULL;
 	struct rte_tailq_entry *te;
-	uint64_t mem_size, rules_size;
+	uint64_t mem_size;
 	struct rte_lpm6_list *lpm_list;
+	struct rte_hash *rules_tbl = NULL;
 
 	lpm_list = RTE_TAILQ_CAST(rte_lpm6_tailq.head, rte_lpm6_list);
 
@@ -136,12 +195,32 @@ rte_lpm6_create(const char *name, int socket_id,
 		return NULL;
 	}
 
+	/* create rules hash table */
+	snprintf(mem_name, sizeof(mem_name), "LRH_%s", name);
+	struct rte_hash_parameters rule_hash_tbl_params = {
+		.entries = config->max_rules * 1.2 +
+			RULE_HASH_TABLE_EXTRA_SPACE,
+		.key_len = sizeof(struct rte_lpm6_rule_key),
+		.hash_func = rule_hash,
+		.hash_func_init_val = 0,
+		.name = mem_name,
+		.reserved = 0,
+		.socket_id = socket_id,
+		.extra_flag = 0
+	};
+
+	rules_tbl = rte_hash_create(&rule_hash_tbl_params);
+	if (rules_tbl == NULL) {
+		RTE_LOG(ERR, LPM, "LPM rules hash table allocation failed: %s (%d)",
+				  rte_strerror(rte_errno), rte_errno);
+		goto fail_wo_unlock;
+	}
+
 	snprintf(mem_name, sizeof(mem_name), "LPM_%s", name);
 
 	/* Determine the amount of memory to allocate. */
 	mem_size = sizeof(*lpm) + (sizeof(lpm->tbl8[0]) *
 			RTE_LPM6_TBL8_GROUP_NUM_ENTRIES * config->number_tbl8s);
-	rules_size = sizeof(struct rte_lpm6_rule) * config->max_rules;
 
 	rte_rwlock_write_lock(RTE_EAL_TAILQ_RWLOCK);
 
@@ -154,7 +233,7 @@ rte_lpm6_create(const char *name, int socket_id,
 	lpm = NULL;
 	if (te != NULL) {
 		rte_errno = EEXIST;
-		goto exit;
+		goto fail;
 	}
 
 	/* allocate tailq entry */
@@ -162,7 +241,7 @@ rte_lpm6_create(const char *name, int socket_id,
 	if (te == NULL) {
 		RTE_LOG(ERR, LPM, "Failed to allocate tailq entry!\n");
 		rte_errno = ENOMEM;
-		goto exit;
+		goto fail;
 	}
 
 	/* Allocate memory to store the LPM data structures. */
@@ -173,34 +252,28 @@ rte_lpm6_create(const char *name, int socket_id,
 		RTE_LOG(ERR, LPM, "LPM memory allocation failed\n");
 		rte_free(te);
 		rte_errno = ENOMEM;
-		goto exit;
-	}
-
-	lpm->rules_tbl = rte_zmalloc_socket(NULL,
-			(size_t)rules_size, RTE_CACHE_LINE_SIZE, socket_id);
-
-	if (lpm->rules_tbl == NULL) {
-		RTE_LOG(ERR, LPM, "LPM rules_tbl allocation failed\n");
-		rte_free(lpm);
-		lpm = NULL;
-		rte_free(te);
-		rte_errno = ENOMEM;
-		goto exit;
+		goto fail;
 	}
 
 	/* Save user arguments. */
 	lpm->max_rules = config->max_rules;
 	lpm->number_tbl8s = config->number_tbl8s;
 	snprintf(lpm->name, sizeof(lpm->name), "%s", name);
+	lpm->rules_tbl = rules_tbl;
 
 	te->data = (void *) lpm;
 
 	TAILQ_INSERT_TAIL(lpm_list, te, next);
+	rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
+	return lpm;
 
-exit:
+fail:
 	rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
 
-	return lpm;
+fail_wo_unlock:
+	rte_hash_free(rules_tbl);
+
+	return NULL;
 }
 
 /*
@@ -259,50 +332,86 @@ rte_lpm6_free(struct rte_lpm6 *lpm)
 
 	rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
 
-	rte_free(lpm->rules_tbl);
+	rte_hash_free(lpm->rules_tbl);
 	rte_free(lpm);
 	rte_free(te);
 }
 
+/* Find a rule */
+static inline int
+rule_find_with_key(struct rte_lpm6 *lpm,
+		  const struct rte_lpm6_rule_key *rule_key,
+		  uint32_t *next_hop)
+{
+	uint64_t hash_val;
+	int ret;
+
+	/* lookup for a rule */
+	ret = rte_hash_lookup_data(lpm->rules_tbl, (const void *) rule_key,
+		(void **) &hash_val);
+	if (ret >= 0) {
+		*next_hop = (uint32_t) hash_val;
+		return 1;
+	}
+
+	return 0;
+}
+
+/* Find a rule */
+static int
+rule_find(struct rte_lpm6 *lpm, uint8_t *ip, uint8_t depth,
+		  uint32_t *next_hop)
+{
+	struct rte_lpm6_rule_key rule_key;
+
+	/* init a rule key */
+	rule_key_init(&rule_key, ip, depth);
+
+	return rule_find_with_key(lpm, &rule_key, next_hop);
+}
+
 /*
  * Checks if a rule already exists in the rules table and updates
  * the nexthop if so. Otherwise it adds a new rule if enough space is available.
+ *
+ * Returns:
+ *    0 - next hop of existed rule is updated
+ *    1 - new rule successfuly added
+ *   <0 - error
  */
-static inline int32_t
-rule_add(struct rte_lpm6 *lpm, uint8_t *ip, uint32_t next_hop, uint8_t depth)
+static inline int
+rule_add(struct rte_lpm6 *lpm, uint8_t *ip, uint8_t depth, uint32_t next_hop)
 {
-	uint32_t rule_index;
-
-	/* Scan through rule list to see if rule already exists. */
-	for (rule_index = 0; rule_index < lpm->used_rules; rule_index++) {
+	int ret, rule_exist;
+	struct rte_lpm6_rule_key rule_key;
+	uint32_t unused;
 
-		/* If rule already exists update its next_hop and return. */
-		if ((memcmp (lpm->rules_tbl[rule_index].ip, ip,
-				RTE_LPM6_IPV6_ADDR_SIZE) == 0) &&
-				lpm->rules_tbl[rule_index].depth == depth) {
-			lpm->rules_tbl[rule_index].next_hop = next_hop;
+	/* init a rule key */
+	rule_key_init(&rule_key, ip, depth);
 
-			return rule_index;
-		}
-	}
+	/* Scan through rule list to see if rule already exists. */
+	rule_exist = rule_find_with_key(lpm, &rule_key, &unused);
 
 	/*
 	 * If rule does not exist check if there is space to add a new rule to
 	 * this rule group. If there is no space return error.
 	 */
-	if (lpm->used_rules == lpm->max_rules) {
+	if (!rule_exist && lpm->used_rules == lpm->max_rules)
 		return -ENOSPC;
-	}
 
-	/* If there is space for the new rule add it. */
-	rte_memcpy(lpm->rules_tbl[rule_index].ip, ip, RTE_LPM6_IPV6_ADDR_SIZE);
-	lpm->rules_tbl[rule_index].next_hop = next_hop;
-	lpm->rules_tbl[rule_index].depth = depth;
+	/* add the rule or update rules next hop */
+	ret = rte_hash_add_key_data(lpm->rules_tbl, &rule_key,
+		(void *)(uintptr_t) next_hop);
+	if (ret < 0)
+		return ret;
 
 	/* Increment the used rules counter for this rule group. */
-	lpm->used_rules++;
+	if (!rule_exist) {
+		lpm->used_rules++;
+		return 1;
+	}
 
-	return rule_index;
+	return 0;
 }
 
 /*
@@ -492,7 +601,7 @@ rte_lpm6_add_v1705(struct rte_lpm6 *lpm, uint8_t *ip, uint8_t depth,
 {
 	struct rte_lpm6_tbl_entry *tbl;
 	struct rte_lpm6_tbl_entry *tbl_next = NULL;
-	int32_t rule_index;
+	int32_t ret;
 	int status;
 	uint8_t masked_ip[RTE_LPM6_IPV6_ADDR_SIZE];
 	int i;
@@ -502,16 +611,14 @@ rte_lpm6_add_v1705(struct rte_lpm6 *lpm, uint8_t *ip, uint8_t depth,
 		return -EINVAL;
 
 	/* Copy the IP and mask it to avoid modifying user's input data. */
-	memcpy(masked_ip, ip, RTE_LPM6_IPV6_ADDR_SIZE);
-	mask_ip(masked_ip, depth);
+	ip6_copy_addr(masked_ip, ip);
+	ip6_mask_addr(masked_ip, depth);
 
 	/* Add the rule to the rule table. */
-	rule_index = rule_add(lpm, masked_ip, next_hop, depth);
-
+	ret = rule_add(lpm, masked_ip, depth, next_hop);
 	/* If there is no space available for new rule return error. */
-	if (rule_index < 0) {
-		return rule_index;
-	}
+	if (ret < 0)
+		return ret;
 
 	/* Inspect the first three bytes through tbl24 on the first step. */
 	tbl = lpm->tbl24;
@@ -724,30 +831,6 @@ MAP_STATIC_SYMBOL(int rte_lpm6_lookup_bulk_func(const struct rte_lpm6 *lpm,
 				int32_t *next_hops, unsigned int n),
 		rte_lpm6_lookup_bulk_func_v1705);
 
-/*
- * Finds a rule in rule table.
- * NOTE: Valid range for depth parameter is 1 .. 128 inclusive.
- */
-static inline int32_t
-rule_find(struct rte_lpm6 *lpm, uint8_t *ip, uint8_t depth)
-{
-	uint32_t rule_index;
-
-	/* Scan used rules at given depth to find rule. */
-	for (rule_index = 0; rule_index < lpm->used_rules; rule_index++) {
-		/* If rule is found return the rule index. */
-		if ((memcmp (lpm->rules_tbl[rule_index].ip, ip,
-				RTE_LPM6_IPV6_ADDR_SIZE) == 0) &&
-				lpm->rules_tbl[rule_index].depth == depth) {
-
-			return rule_index;
-		}
-	}
-
-	/* If rule is not found return -ENOENT. */
-	return -ENOENT;
-}
-
 /*
  * Look for a rule in the high-level rules table
  */
@@ -775,8 +858,7 @@ int
 rte_lpm6_is_rule_present_v1705(struct rte_lpm6 *lpm, uint8_t *ip, uint8_t depth,
 		uint32_t *next_hop)
 {
-	uint8_t ip_masked[RTE_LPM6_IPV6_ADDR_SIZE];
-	int32_t rule_index;
+	uint8_t masked_ip[RTE_LPM6_IPV6_ADDR_SIZE];
 
 	/* Check user arguments. */
 	if ((lpm == NULL) || next_hop == NULL || ip == NULL ||
@@ -784,19 +866,10 @@ rte_lpm6_is_rule_present_v1705(struct rte_lpm6 *lpm, uint8_t *ip, uint8_t depth,
 		return -EINVAL;
 
 	/* Copy the IP and mask it to avoid modifying user's input data. */
-	memcpy(ip_masked, ip, RTE_LPM6_IPV6_ADDR_SIZE);
-	mask_ip(ip_masked, depth);
-
-	/* Look for the rule using rule_find. */
-	rule_index = rule_find(lpm, ip_masked, depth);
-
-	if (rule_index >= 0) {
-		*next_hop = lpm->rules_tbl[rule_index].next_hop;
-		return 1;
-	}
+	ip6_copy_addr(masked_ip, ip);
+	ip6_mask_addr(masked_ip, depth);
 
-	/* If rule is not found return 0. */
-	return 0;
+	return rule_find(lpm, masked_ip, depth, next_hop);
 }
 BIND_DEFAULT_SYMBOL(rte_lpm6_is_rule_present, _v1705, 17.05);
 MAP_STATIC_SYMBOL(int rte_lpm6_is_rule_present(struct rte_lpm6 *lpm,
@@ -806,16 +879,25 @@ MAP_STATIC_SYMBOL(int rte_lpm6_is_rule_present(struct rte_lpm6 *lpm,
 /*
  * Delete a rule from the rule table.
  * NOTE: Valid range for depth parameter is 1 .. 128 inclusive.
+ * return
+ *	  0 on success
+ *   <0 on failure
  */
-static inline void
-rule_delete(struct rte_lpm6 *lpm, int32_t rule_index)
+static inline int
+rule_delete(struct rte_lpm6 *lpm, uint8_t *ip, uint8_t depth)
 {
-	/*
-	 * Overwrite redundant rule with last rule in group and decrement rule
-	 * counter.
-	 */
-	lpm->rules_tbl[rule_index] = lpm->rules_tbl[lpm->used_rules-1];
-	lpm->used_rules--;
+	int ret;
+	struct rte_lpm6_rule_key rule_key;
+
+	/* init rule key */
+	rule_key_init(&rule_key, ip, depth);
+
+	/* delete the rule */
+	ret = rte_hash_del_key(lpm->rules_tbl, (void *) &rule_key);
+	if (ret >= 0)
+		lpm->used_rules--;
+
+	return ret;
 }
 
 /*
@@ -824,9 +906,8 @@ rule_delete(struct rte_lpm6 *lpm, int32_t rule_index)
 int
 rte_lpm6_delete(struct rte_lpm6 *lpm, uint8_t *ip, uint8_t depth)
 {
-	int32_t rule_to_delete_index;
-	uint8_t ip_masked[RTE_LPM6_IPV6_ADDR_SIZE];
-	unsigned i;
+	uint8_t masked_ip[RTE_LPM6_IPV6_ADDR_SIZE];
+	int ret;
 
 	/*
 	 * Check input arguments.
@@ -836,24 +917,13 @@ rte_lpm6_delete(struct rte_lpm6 *lpm, uint8_t *ip, uint8_t depth)
 	}
 
 	/* Copy the IP and mask it to avoid modifying user's input data. */
-	memcpy(ip_masked, ip, RTE_LPM6_IPV6_ADDR_SIZE);
-	mask_ip(ip_masked, depth);
-
-	/*
-	 * Find the index of the input rule, that needs to be deleted, in the
-	 * rule table.
-	 */
-	rule_to_delete_index = rule_find(lpm, ip_masked, depth);
-
-	/*
-	 * Check if rule_to_delete_index was found. If no rule was found the
-	 * function rule_find returns -ENOENT.
-	 */
-	if (rule_to_delete_index < 0)
-		return rule_to_delete_index;
+	ip6_copy_addr(masked_ip, ip);
+	ip6_mask_addr(masked_ip, depth);
 
 	/* Delete the rule from the rule table. */
-	rule_delete(lpm, rule_to_delete_index);
+	ret = rule_delete(lpm, masked_ip, depth);
+	if (ret < 0)
+		return -ENOENT;
 
 	/*
 	 * Set all the table entries to 0 (ie delete every rule
@@ -868,10 +938,7 @@ rte_lpm6_delete(struct rte_lpm6 *lpm, uint8_t *ip, uint8_t depth)
 	 * Add every rule again (except for the one that was removed from
 	 * the rules table).
 	 */
-	for (i = 0; i < lpm->used_rules; i++) {
-		rte_lpm6_add(lpm, lpm->rules_tbl[i].ip, lpm->rules_tbl[i].depth,
-				lpm->rules_tbl[i].next_hop);
-	}
+	rebuild_lpm(lpm);
 
 	return 0;
 }
@@ -883,37 +950,19 @@ int
 rte_lpm6_delete_bulk_func(struct rte_lpm6 *lpm,
 		uint8_t ips[][RTE_LPM6_IPV6_ADDR_SIZE], uint8_t *depths, unsigned n)
 {
-	int32_t rule_to_delete_index;
-	uint8_t ip_masked[RTE_LPM6_IPV6_ADDR_SIZE];
+	uint8_t masked_ip[RTE_LPM6_IPV6_ADDR_SIZE];
 	unsigned i;
 
 	/*
 	 * Check input arguments.
 	 */
-	if ((lpm == NULL) || (ips == NULL) || (depths == NULL)) {
+	if ((lpm == NULL) || (ips == NULL) || (depths == NULL))
 		return -EINVAL;
-	}
 
 	for (i = 0; i < n; i++) {
-		/* Copy the IP and mask it to avoid modifying user's input data. */
-		memcpy(ip_masked, ips[i], RTE_LPM6_IPV6_ADDR_SIZE);
-		mask_ip(ip_masked, depths[i]);
-
-		/*
-		 * Find the index of the input rule, that needs to be deleted, in the
-		 * rule table.
-		 */
-		rule_to_delete_index = rule_find(lpm, ip_masked, depths[i]);
-
-		/*
-		 * Check if rule_to_delete_index was found. If no rule was found the
-		 * function rule_find returns -ENOENT.
-		 */
-		if (rule_to_delete_index < 0)
-			continue;
-
-		/* Delete the rule from the rule table. */
-		rule_delete(lpm, rule_to_delete_index);
+		ip6_copy_addr(masked_ip, ips[i]);
+		ip6_mask_addr(masked_ip, depths[i]);
+		rule_delete(lpm, masked_ip, depths[i]);
 	}
 
 	/*
@@ -929,10 +978,7 @@ rte_lpm6_delete_bulk_func(struct rte_lpm6 *lpm,
 	 * Add every rule again (except for the ones that were removed from
 	 * the rules table).
 	 */
-	for (i = 0; i < lpm->used_rules; i++) {
-		rte_lpm6_add(lpm, lpm->rules_tbl[i].ip, lpm->rules_tbl[i].depth,
-				lpm->rules_tbl[i].next_hop);
-	}
+	rebuild_lpm(lpm);
 
 	return 0;
 }
@@ -957,5 +1003,5 @@ rte_lpm6_delete_all(struct rte_lpm6 *lpm)
 			RTE_LPM6_TBL8_GROUP_NUM_ENTRIES * lpm->number_tbl8s);
 
 	/* Delete all rules form the rules table. */
-	memset(lpm->rules_tbl, 0, sizeof(struct rte_lpm6_rule) * lpm->max_rules);
+	rte_hash_reset(lpm->rules_tbl);
 }
-- 
2.16.1.windows.1

Re: [dpdk-dev] [PATCH v6 1/2] librte_lpm: Improve performance of the delete and add functions

[Bruce Richardson]

On Tue, Jul 17, 2018 at 12:20:10PM +0300, Alex Kiselev wrote:
> librte_lpm: Improve lpm6 performance
> 
> Rework the lpm6 rule subsystem and replace
> current rules algorithm complexity O(n)
> with hashtables which allow dealing with
> large (50k) rule sets.
> 
> Signed-off-by: Alex Kiselev <alex@therouter.net>

Title needs a little rewording. Suggest "lpm: store rules in hash table for
lpm6" or similar.

Otherwise:
Acked-by: Bruce Richardson <bruce.richardson@intel.com>