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>
252 lines
6.4 KiB
C
252 lines
6.4 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 _DIR24_8_H_
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#define _DIR24_8_H_
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#include <rte_prefetch.h>
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#include <rte_branch_prediction.h>
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/**
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* @file
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* DIR24_8 algorithm
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*/
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#define DIR24_8_TBL24_NUM_ENT (1 << 24)
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#define DIR24_8_TBL8_GRP_NUM_ENT 256U
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#define DIR24_8_EXT_ENT 1
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#define DIR24_8_TBL24_MASK 0xffffff00
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#define BITMAP_SLAB_BIT_SIZE_LOG2 6
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#define BITMAP_SLAB_BIT_SIZE (1 << BITMAP_SLAB_BIT_SIZE_LOG2)
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#define BITMAP_SLAB_BITMASK (BITMAP_SLAB_BIT_SIZE - 1)
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struct dir24_8_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 number of tbl8s */
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enum rte_fib_dir24_8_nh_sz nh_sz; /**< Size of nexthop entry */
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uint64_t def_nh; /**< Default next hop */
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uint64_t *tbl8; /**< tbl8 table. */
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uint64_t *tbl8_idxes; /**< bitmap containing free tbl8 idxes*/
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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 void *
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get_tbl24_p(struct dir24_8_tbl *dp, uint32_t ip, uint8_t nh_sz)
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{
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return (void *)&((uint8_t *)dp->tbl24)[(ip &
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DIR24_8_TBL24_MASK) >> (8 - 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 uint32_t
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get_tbl24_idx(uint32_t ip)
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{
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return ip >> 8;
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}
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static inline uint32_t
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get_tbl8_idx(uint32_t res, uint32_t ip)
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{
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return (res >> 1) * DIR24_8_TBL8_GRP_NUM_ENT + (uint8_t)ip;
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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_idx(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_tbl24(struct dir24_8_tbl *dp, uint32_t ip, uint8_t nh_sz)
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{
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return ((dp->tbl24[get_tbl_idx(get_tbl24_idx(ip), nh_sz)] >>
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(get_psd_idx(get_tbl24_idx(ip), 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 uint64_t
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get_tbl8(struct dir24_8_tbl *dp, uint32_t res, uint32_t ip, uint8_t nh_sz)
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{
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return ((dp->tbl8[get_tbl_idx(get_tbl8_idx(res, ip), nh_sz)] >>
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(get_psd_idx(get_tbl8_idx(res, ip), 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 int
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is_entry_extended(uint64_t ent)
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{
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return (ent & DIR24_8_EXT_ENT) == DIR24_8_EXT_ENT;
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}
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#define LOOKUP_FUNC(suffix, type, bulk_prefetch, nh_sz) \
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static inline void dir24_8_lookup_bulk_##suffix(void *p, const uint32_t *ips, \
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uint64_t *next_hops, const unsigned int n) \
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{ \
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struct dir24_8_tbl *dp = (struct dir24_8_tbl *)p; \
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uint64_t tmp; \
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uint32_t i; \
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uint32_t prefetch_offset = \
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RTE_MIN((unsigned int)bulk_prefetch, n); \
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\
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for (i = 0; i < prefetch_offset; i++) \
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rte_prefetch0(get_tbl24_p(dp, ips[i], nh_sz)); \
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for (i = 0; i < (n - prefetch_offset); i++) { \
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rte_prefetch0(get_tbl24_p(dp, \
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ips[i + prefetch_offset], nh_sz)); \
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tmp = ((type *)dp->tbl24)[ips[i] >> 8]; \
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if (unlikely(is_entry_extended(tmp))) \
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tmp = ((type *)dp->tbl8)[(uint8_t)ips[i] + \
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((tmp >> 1) * DIR24_8_TBL8_GRP_NUM_ENT)]; \
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next_hops[i] = tmp >> 1; \
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} \
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for (; i < n; i++) { \
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tmp = ((type *)dp->tbl24)[ips[i] >> 8]; \
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if (unlikely(is_entry_extended(tmp))) \
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tmp = ((type *)dp->tbl8)[(uint8_t)ips[i] + \
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((tmp >> 1) * DIR24_8_TBL8_GRP_NUM_ENT)]; \
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next_hops[i] = tmp >> 1; \
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} \
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} \
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LOOKUP_FUNC(1b, uint8_t, 5, 0)
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LOOKUP_FUNC(2b, uint16_t, 6, 1)
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LOOKUP_FUNC(4b, uint32_t, 15, 2)
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LOOKUP_FUNC(8b, uint64_t, 12, 3)
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static inline void
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dir24_8_lookup_bulk(struct dir24_8_tbl *dp, const uint32_t *ips,
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uint64_t *next_hops, const unsigned int n, uint8_t nh_sz)
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{
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uint64_t tmp;
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uint32_t i;
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uint32_t prefetch_offset = RTE_MIN(15U, n);
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for (i = 0; i < prefetch_offset; i++)
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rte_prefetch0(get_tbl24_p(dp, ips[i], nh_sz));
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for (i = 0; i < (n - prefetch_offset); i++) {
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rte_prefetch0(get_tbl24_p(dp, ips[i + prefetch_offset],
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nh_sz));
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tmp = get_tbl24(dp, ips[i], nh_sz);
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if (unlikely(is_entry_extended(tmp)))
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tmp = get_tbl8(dp, tmp, ips[i], nh_sz);
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next_hops[i] = tmp >> 1;
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}
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for (; i < n; i++) {
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tmp = get_tbl24(dp, ips[i], nh_sz);
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if (unlikely(is_entry_extended(tmp)))
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tmp = get_tbl8(dp, tmp, ips[i], nh_sz);
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next_hops[i] = tmp >> 1;
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}
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}
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static inline void
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dir24_8_lookup_bulk_0(void *p, const uint32_t *ips,
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uint64_t *next_hops, const unsigned int n)
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{
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struct dir24_8_tbl *dp = (struct dir24_8_tbl *)p;
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dir24_8_lookup_bulk(dp, ips, next_hops, n, 0);
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}
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static inline void
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dir24_8_lookup_bulk_1(void *p, const uint32_t *ips,
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uint64_t *next_hops, const unsigned int n)
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{
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struct dir24_8_tbl *dp = (struct dir24_8_tbl *)p;
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dir24_8_lookup_bulk(dp, ips, next_hops, n, 1);
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}
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static inline void
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dir24_8_lookup_bulk_2(void *p, const uint32_t *ips,
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uint64_t *next_hops, const unsigned int n)
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{
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struct dir24_8_tbl *dp = (struct dir24_8_tbl *)p;
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dir24_8_lookup_bulk(dp, ips, next_hops, n, 2);
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}
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static inline void
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dir24_8_lookup_bulk_3(void *p, const uint32_t *ips,
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uint64_t *next_hops, const unsigned int n)
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{
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struct dir24_8_tbl *dp = (struct dir24_8_tbl *)p;
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dir24_8_lookup_bulk(dp, ips, next_hops, n, 3);
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}
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static inline void
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dir24_8_lookup_bulk_uni(void *p, const uint32_t *ips,
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uint64_t *next_hops, const unsigned int n)
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{
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struct dir24_8_tbl *dp = (struct dir24_8_tbl *)p;
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uint64_t tmp;
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uint32_t i;
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uint32_t prefetch_offset = RTE_MIN(15U, n);
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uint8_t nh_sz = dp->nh_sz;
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for (i = 0; i < prefetch_offset; i++)
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rte_prefetch0(get_tbl24_p(dp, ips[i], nh_sz));
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for (i = 0; i < (n - prefetch_offset); i++) {
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rte_prefetch0(get_tbl24_p(dp, ips[i + prefetch_offset],
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nh_sz));
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tmp = get_tbl24(dp, ips[i], nh_sz);
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if (unlikely(is_entry_extended(tmp)))
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tmp = get_tbl8(dp, tmp, ips[i], nh_sz);
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next_hops[i] = tmp >> 1;
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}
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for (; i < n; i++) {
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tmp = get_tbl24(dp, ips[i], nh_sz);
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if (unlikely(is_entry_extended(tmp)))
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tmp = get_tbl8(dp, tmp, ips[i], nh_sz);
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next_hops[i] = tmp >> 1;
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}
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}
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void *
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dir24_8_create(const char *name, int socket_id, struct rte_fib_conf *conf);
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void
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dir24_8_free(void *p);
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rte_fib_lookup_fn_t
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dir24_8_get_lookup_fn(void *p, enum rte_fib_lookup_type type);
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int
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dir24_8_modify(struct rte_fib *fib, uint32_t ip, uint8_t depth,
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uint64_t next_hop, int op);
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#endif /* _DIR24_8_H_ */
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