7a33572057
The private headers are compiled internally with a C compiler. Thus extern "C" declaration is useless in such files. Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
145 lines
3.6 KiB
C
145 lines
3.6 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause
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* Copyright(c) 2018 Vladimir Medvedkin <medvedkinv@gmail.com>
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* Copyright(c) 2019 Intel Corporation
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*/
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#ifndef _TRIE_H_
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#define _TRIE_H_
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/**
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* @file
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* RTE IPv6 Longest Prefix Match (LPM)
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*/
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#include <rte_prefetch.h>
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#include <rte_branch_prediction.h>
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/* @internal Total number of tbl24 entries. */
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#define TRIE_TBL24_NUM_ENT (1 << 24)
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/* Maximum depth value possible for IPv6 LPM. */
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#define TRIE_MAX_DEPTH 128
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/* @internal Number of entries in a tbl8 group. */
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#define TRIE_TBL8_GRP_NUM_ENT 256ULL
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/* @internal Total number of tbl8 groups in the tbl8. */
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#define TRIE_TBL8_NUM_GROUPS 65536
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/* @internal bitmask with valid and valid_group fields set */
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#define TRIE_EXT_ENT 1
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#define BITMAP_SLAB_BIT_SIZE_LOG2 6
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#define BITMAP_SLAB_BIT_SIZE (1ULL << BITMAP_SLAB_BIT_SIZE_LOG2)
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#define BITMAP_SLAB_BITMASK (BITMAP_SLAB_BIT_SIZE - 1)
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struct rte_trie_tbl {
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uint32_t number_tbl8s; /**< Total number of tbl8s */
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uint32_t rsvd_tbl8s; /**< Number of reserved tbl8s */
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uint32_t cur_tbl8s; /**< Current cumber of tbl8s */
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uint64_t def_nh; /**< Default next hop */
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enum rte_fib_trie_nh_sz nh_sz; /**< Size of nexthop entry */
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uint64_t *tbl8; /**< tbl8 table. */
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uint32_t *tbl8_pool; /**< bitmap containing free tbl8 idxes*/
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uint32_t tbl8_pool_pos;
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/* tbl24 table. */
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__extension__ uint64_t tbl24[0] __rte_cache_aligned;
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};
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static inline uint32_t
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get_tbl24_idx(const uint8_t *ip)
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{
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return ip[0] << 16|ip[1] << 8|ip[2];
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}
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static inline void *
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get_tbl24_p(struct rte_trie_tbl *dp, const uint8_t *ip, uint8_t nh_sz)
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{
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uint32_t tbl24_idx;
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tbl24_idx = get_tbl24_idx(ip);
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return (void *)&((uint8_t *)dp->tbl24)[tbl24_idx << nh_sz];
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}
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static inline uint8_t
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bits_in_nh(uint8_t nh_sz)
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{
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return 8 * (1 << nh_sz);
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}
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static inline uint64_t
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get_max_nh(uint8_t nh_sz)
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{
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return ((1ULL << (bits_in_nh(nh_sz) - 1)) - 1);
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}
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static inline uint64_t
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lookup_msk(uint8_t nh_sz)
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{
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return ((1ULL << ((1 << (nh_sz + 3)) - 1)) << 1) - 1;
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}
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static inline uint8_t
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get_psd_idx(uint32_t val, uint8_t nh_sz)
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{
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return val & ((1 << (3 - nh_sz)) - 1);
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}
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static inline uint32_t
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get_tbl_pos(uint32_t val, uint8_t nh_sz)
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{
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return val >> (3 - nh_sz);
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}
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static inline uint64_t
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get_tbl_val_by_idx(uint64_t *tbl, uint32_t idx, uint8_t nh_sz)
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{
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return ((tbl[get_tbl_pos(idx, nh_sz)] >> (get_psd_idx(idx, nh_sz) *
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bits_in_nh(nh_sz))) & lookup_msk(nh_sz));
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}
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static inline void *
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get_tbl_p_by_idx(uint64_t *tbl, uint64_t idx, uint8_t nh_sz)
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{
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return (uint8_t *)tbl + (idx << nh_sz);
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}
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static inline int
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is_entry_extended(uint64_t ent)
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{
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return (ent & TRIE_EXT_ENT) == TRIE_EXT_ENT;
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}
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#define LOOKUP_FUNC(suffix, type, nh_sz) \
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static inline void rte_trie_lookup_bulk_##suffix(void *p, \
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uint8_t ips[][RTE_FIB6_IPV6_ADDR_SIZE], \
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uint64_t *next_hops, const unsigned int n) \
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{ \
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struct rte_trie_tbl *dp = (struct rte_trie_tbl *)p; \
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uint64_t tmp; \
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uint32_t i, j; \
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\
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for (i = 0; i < n; i++) { \
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tmp = ((type *)dp->tbl24)[get_tbl24_idx(&ips[i][0])]; \
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j = 3; \
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while (is_entry_extended(tmp)) { \
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tmp = ((type *)dp->tbl8)[ips[i][j++] + \
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((tmp >> 1) * TRIE_TBL8_GRP_NUM_ENT)]; \
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} \
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next_hops[i] = tmp >> 1; \
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} \
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}
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LOOKUP_FUNC(2b, uint16_t, 1)
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LOOKUP_FUNC(4b, uint32_t, 2)
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LOOKUP_FUNC(8b, uint64_t, 3)
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void *
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trie_create(const char *name, int socket_id, struct rte_fib6_conf *conf);
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void
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trie_free(void *p);
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rte_fib6_lookup_fn_t
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trie_get_lookup_fn(void *p, enum rte_fib6_lookup_type type);
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int
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trie_modify(struct rte_fib6 *fib, const uint8_t ip[RTE_FIB6_IPV6_ADDR_SIZE],
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uint8_t depth, uint64_t next_hop, int op);
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#endif /* _TRIE_H_ */
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