X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;ds=sidebyside;f=lib%2Flibrte_table%2Frte_table_lpm.c;fp=lib%2Flibrte_table%2Frte_table_lpm.c;h=cdeb0f5ae524ac6c557676528718157210403df9;hb=97f17497d162afdb82c8704bf097f0fee3724b2e;hp=0000000000000000000000000000000000000000;hpb=e04be89c2409570e0055b2cda60bd11395bb93b0;p=deb_dpdk.git

diff --git a/lib/librte_table/rte_table_lpm.c b/lib/librte_table/rte_table_lpm.c
new file mode 100644
index 00000000..cdeb0f5a
--- /dev/null
+++ b/lib/librte_table/rte_table_lpm.c
@@ -0,0 +1,393 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <string.h>
+#include <stdio.h>
+
+#include <rte_common.h>
+#include <rte_mbuf.h>
+#include <rte_memory.h>
+#include <rte_malloc.h>
+#include <rte_byteorder.h>
+#include <rte_log.h>
+#include <rte_lpm.h>
+
+#include "rte_table_lpm.h"
+
+#define RTE_TABLE_LPM_MAX_NEXT_HOPS                        256
+
+#ifdef RTE_TABLE_STATS_COLLECT
+
+#define RTE_TABLE_LPM_STATS_PKTS_IN_ADD(table, val) \
+	table->stats.n_pkts_in += val
+#define RTE_TABLE_LPM_STATS_PKTS_LOOKUP_MISS(table, val) \
+	table->stats.n_pkts_lookup_miss += val
+
+#else
+
+#define RTE_TABLE_LPM_STATS_PKTS_IN_ADD(table, val)
+#define RTE_TABLE_LPM_STATS_PKTS_LOOKUP_MISS(table, val)
+
+#endif
+
+struct rte_table_lpm {
+	struct rte_table_stats stats;
+
+	/* Input parameters */
+	uint32_t entry_size;
+	uint32_t entry_unique_size;
+	uint32_t n_rules;
+	uint32_t offset;
+
+	/* Handle to low-level LPM table */
+	struct rte_lpm *lpm;
+
+	/* Next Hop Table (NHT) */
+	uint32_t nht_users[RTE_TABLE_LPM_MAX_NEXT_HOPS];
+	uint32_t nht[0] __rte_cache_aligned;
+};
+
+static void *
+rte_table_lpm_create(void *params, int socket_id, uint32_t entry_size)
+{
+	struct rte_table_lpm_params *p = (struct rte_table_lpm_params *) params;
+	struct rte_table_lpm *lpm;
+	struct rte_lpm_config lpm_config;
+
+	uint32_t total_size, nht_size;
+
+	/* Check input parameters */
+	if (p == NULL) {
+		RTE_LOG(ERR, TABLE, "%s: NULL input parameters\n", __func__);
+		return NULL;
+	}
+	if (p->n_rules == 0) {
+		RTE_LOG(ERR, TABLE, "%s: Invalid n_rules\n", __func__);
+		return NULL;
+	}
+	if (p->number_tbl8s == 0) {
+		RTE_LOG(ERR, TABLE, "%s: Invalid number_tbl8s\n", __func__);
+		return NULL;
+	}
+	if (p->entry_unique_size == 0) {
+		RTE_LOG(ERR, TABLE, "%s: Invalid entry_unique_size\n",
+			__func__);
+		return NULL;
+	}
+	if (p->entry_unique_size > entry_size) {
+		RTE_LOG(ERR, TABLE, "%s: Invalid entry_unique_size\n",
+			__func__);
+		return NULL;
+	}
+	if (p->name == NULL) {
+		RTE_LOG(ERR, TABLE, "%s: Table name is NULL\n",
+			__func__);
+		return NULL;
+	}
+	entry_size = RTE_ALIGN(entry_size, sizeof(uint64_t));
+
+	/* Memory allocation */
+	nht_size = RTE_TABLE_LPM_MAX_NEXT_HOPS * entry_size;
+	total_size = sizeof(struct rte_table_lpm) + nht_size;
+	lpm = rte_zmalloc_socket("TABLE", total_size, RTE_CACHE_LINE_SIZE,
+		socket_id);
+	if (lpm == NULL) {
+		RTE_LOG(ERR, TABLE,
+			"%s: Cannot allocate %u bytes for LPM table\n",
+			__func__, total_size);
+		return NULL;
+	}
+
+	/* LPM low-level table creation */
+	lpm_config.max_rules = p->n_rules;
+	lpm_config.number_tbl8s = p->number_tbl8s;
+	lpm_config.flags = p->flags;
+	lpm->lpm = rte_lpm_create(p->name, socket_id, &lpm_config);
+
+	if (lpm->lpm == NULL) {
+		rte_free(lpm);
+		RTE_LOG(ERR, TABLE, "Unable to create low-level LPM table\n");
+		return NULL;
+	}
+
+	/* Memory initialization */
+	lpm->entry_size = entry_size;
+	lpm->entry_unique_size = p->entry_unique_size;
+	lpm->n_rules = p->n_rules;
+	lpm->offset = p->offset;
+
+	return lpm;
+}
+
+static int
+rte_table_lpm_free(void *table)
+{
+	struct rte_table_lpm *lpm = (struct rte_table_lpm *) table;
+
+	/* Check input parameters */
+	if (lpm == NULL) {
+		RTE_LOG(ERR, TABLE, "%s: table parameter is NULL\n", __func__);
+		return -EINVAL;
+	}
+
+	/* Free previously allocated resources */
+	rte_lpm_free(lpm->lpm);
+	rte_free(lpm);
+
+	return 0;
+}
+
+static int
+nht_find_free(struct rte_table_lpm *lpm, uint32_t *pos)
+{
+	uint32_t i;
+
+	for (i = 0; i < RTE_TABLE_LPM_MAX_NEXT_HOPS; i++) {
+		if (lpm->nht_users[i] == 0) {
+			*pos = i;
+			return 1;
+		}
+	}
+
+	return 0;
+}
+
+static int
+nht_find_existing(struct rte_table_lpm *lpm, void *entry, uint32_t *pos)
+{
+	uint32_t i;
+
+	for (i = 0; i < RTE_TABLE_LPM_MAX_NEXT_HOPS; i++) {
+		uint32_t *nht_entry = &lpm->nht[i * lpm->entry_size];
+
+		if ((lpm->nht_users[i] > 0) && (memcmp(nht_entry, entry,
+			lpm->entry_unique_size) == 0)) {
+			*pos = i;
+			return 1;
+		}
+	}
+
+	return 0;
+}
+
+static int
+rte_table_lpm_entry_add(
+	void *table,
+	void *key,
+	void *entry,
+	int *key_found,
+	void **entry_ptr)
+{
+	struct rte_table_lpm *lpm = (struct rte_table_lpm *) table;
+	struct rte_table_lpm_key *ip_prefix = (struct rte_table_lpm_key *) key;
+	uint32_t nht_pos, nht_pos0_valid;
+	int status;
+	uint32_t nht_pos0 = 0;
+
+	/* Check input parameters */
+	if (lpm == NULL) {
+		RTE_LOG(ERR, TABLE, "%s: table parameter is NULL\n", __func__);
+		return -EINVAL;
+	}
+	if (ip_prefix == NULL) {
+		RTE_LOG(ERR, TABLE, "%s: ip_prefix parameter is NULL\n",
+			__func__);
+		return -EINVAL;
+	}
+	if (entry == NULL) {
+		RTE_LOG(ERR, TABLE, "%s: entry parameter is NULL\n", __func__);
+		return -EINVAL;
+	}
+
+	if ((ip_prefix->depth == 0) || (ip_prefix->depth > 32)) {
+		RTE_LOG(ERR, TABLE, "%s: invalid depth (%d)\n",
+			__func__, ip_prefix->depth);
+		return -EINVAL;
+	}
+
+	/* Check if rule is already present in the table */
+	status = rte_lpm_is_rule_present(lpm->lpm, ip_prefix->ip,
+		ip_prefix->depth, &nht_pos0);
+	nht_pos0_valid = status > 0;
+
+	/* Find existing or free NHT entry */
+	if (nht_find_existing(lpm, entry, &nht_pos) == 0) {
+		uint32_t *nht_entry;
+
+		if (nht_find_free(lpm, &nht_pos) == 0) {
+			RTE_LOG(ERR, TABLE, "%s: NHT full\n", __func__);
+			return -1;
+		}
+
+		nht_entry = &lpm->nht[nht_pos * lpm->entry_size];
+		memcpy(nht_entry, entry, lpm->entry_size);
+	}
+
+	/* Add rule to low level LPM table */
+	if (rte_lpm_add(lpm->lpm, ip_prefix->ip, ip_prefix->depth, nht_pos) < 0) {
+		RTE_LOG(ERR, TABLE, "%s: LPM rule add failed\n", __func__);
+		return -1;
+	}
+
+	/* Commit NHT changes */
+	lpm->nht_users[nht_pos]++;
+	lpm->nht_users[nht_pos0] -= nht_pos0_valid;
+
+	*key_found = nht_pos0_valid;
+	*entry_ptr = (void *) &lpm->nht[nht_pos * lpm->entry_size];
+	return 0;
+}
+
+static int
+rte_table_lpm_entry_delete(
+	void *table,
+	void *key,
+	int *key_found,
+	void *entry)
+{
+	struct rte_table_lpm *lpm = (struct rte_table_lpm *) table;
+	struct rte_table_lpm_key *ip_prefix = (struct rte_table_lpm_key *) key;
+	uint32_t nht_pos;
+	int status;
+
+	/* Check input parameters */
+	if (lpm == NULL) {
+		RTE_LOG(ERR, TABLE, "%s: table parameter is NULL\n", __func__);
+		return -EINVAL;
+	}
+	if (ip_prefix == NULL) {
+		RTE_LOG(ERR, TABLE, "%s: ip_prefix parameter is NULL\n",
+			__func__);
+		return -EINVAL;
+	}
+	if ((ip_prefix->depth == 0) || (ip_prefix->depth > 32)) {
+		RTE_LOG(ERR, TABLE, "%s: invalid depth (%d)\n", __func__,
+			ip_prefix->depth);
+		return -EINVAL;
+	}
+
+	/* Return if rule is not present in the table */
+	status = rte_lpm_is_rule_present(lpm->lpm, ip_prefix->ip,
+		ip_prefix->depth, &nht_pos);
+	if (status < 0) {
+		RTE_LOG(ERR, TABLE, "%s: LPM algorithmic error\n", __func__);
+		return -1;
+	}
+	if (status == 0) {
+		*key_found = 0;
+		return 0;
+	}
+
+	/* Delete rule from the low-level LPM table */
+	status = rte_lpm_delete(lpm->lpm, ip_prefix->ip, ip_prefix->depth);
+	if (status) {
+		RTE_LOG(ERR, TABLE, "%s: LPM rule delete failed\n", __func__);
+		return -1;
+	}
+
+	/* Commit NHT changes */
+	lpm->nht_users[nht_pos]--;
+
+	*key_found = 1;
+	if (entry)
+		memcpy(entry, &lpm->nht[nht_pos * lpm->entry_size],
+			lpm->entry_size);
+
+	return 0;
+}
+
+static int
+rte_table_lpm_lookup(
+	void *table,
+	struct rte_mbuf **pkts,
+	uint64_t pkts_mask,
+	uint64_t *lookup_hit_mask,
+	void **entries)
+{
+	struct rte_table_lpm *lpm = (struct rte_table_lpm *) table;
+	uint64_t pkts_out_mask = 0;
+	uint32_t i;
+
+	__rte_unused uint32_t n_pkts_in = __builtin_popcountll(pkts_mask);
+	RTE_TABLE_LPM_STATS_PKTS_IN_ADD(lpm, n_pkts_in);
+
+	pkts_out_mask = 0;
+	for (i = 0; i < (uint32_t)(RTE_PORT_IN_BURST_SIZE_MAX -
+		__builtin_clzll(pkts_mask)); i++) {
+		uint64_t pkt_mask = 1LLU << i;
+
+		if (pkt_mask & pkts_mask) {
+			struct rte_mbuf *pkt = pkts[i];
+			uint32_t ip = rte_bswap32(
+				RTE_MBUF_METADATA_UINT32(pkt, lpm->offset));
+			int status;
+			uint32_t nht_pos;
+
+			status = rte_lpm_lookup(lpm->lpm, ip, &nht_pos);
+			if (status == 0) {
+				pkts_out_mask |= pkt_mask;
+				entries[i] = (void *) &lpm->nht[nht_pos *
+					lpm->entry_size];
+			}
+		}
+	}
+
+	*lookup_hit_mask = pkts_out_mask;
+	RTE_TABLE_LPM_STATS_PKTS_LOOKUP_MISS(lpm, n_pkts_in - __builtin_popcountll(pkts_out_mask));
+	return 0;
+}
+
+static int
+rte_table_lpm_stats_read(void *table, struct rte_table_stats *stats, int clear)
+{
+	struct rte_table_lpm *t = (struct rte_table_lpm *) table;
+
+	if (stats != NULL)
+		memcpy(stats, &t->stats, sizeof(t->stats));
+
+	if (clear)
+		memset(&t->stats, 0, sizeof(t->stats));
+
+	return 0;
+}
+
+struct rte_table_ops rte_table_lpm_ops = {
+	.f_create = rte_table_lpm_create,
+	.f_free = rte_table_lpm_free,
+	.f_add = rte_table_lpm_entry_add,
+	.f_delete = rte_table_lpm_entry_delete,
+	.f_add_bulk = NULL,
+	.f_delete_bulk = NULL,
+	.f_lookup = rte_table_lpm_lookup,
+	.f_stats = rte_table_lpm_stats_read,
+};