From: Pablo de Lara Date: Tue, 17 Jan 2017 22:23:52 +0000 (+0000) Subject: efd: add AVX2 vector lookup function X-Git-Tag: spdx-start~4729 X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=86d898968826;p=dpdk.git efd: add AVX2 vector lookup function Signed-off-by: Byron Marohn Signed-off-by: Pablo de Lara Signed-off-by: Saikrishna Edupuganti Acked-by: Christian Maciocco --- diff --git a/lib/librte_efd/rte_efd.c b/lib/librte_efd/rte_efd.c index 2bcfd62a21..68e6dab02d 100644 --- a/lib/librte_efd/rte_efd.c +++ b/lib/librte_efd/rte_efd.c @@ -52,6 +52,9 @@ #include #include "rte_efd.h" +#if defined(RTE_ARCH_X86) +#include "rte_efd_x86.h" +#endif #define EFD_KEY(key_idx, table) (table->keys + ((key_idx) * table->key_len)) /** Hash function used to determine chunk_id and bin_id for a group */ @@ -100,6 +103,7 @@ allocated memory /* All different internal lookup functions */ enum efd_lookup_internal_function { EFD_LOOKUP_SCALAR = 0, + EFD_LOOKUP_AVX2, EFD_LOOKUP_NUM }; @@ -662,7 +666,16 @@ rte_efd_create(const char *name, uint32_t max_num_rules, uint32_t key_len, } } - table->lookup_fn = EFD_LOOKUP_SCALAR; +#if defined(RTE_ARCH_X86) + /* + * For less than 4 bits, scalar function performs better + * than vectorised version + */ + if (RTE_EFD_VALUE_NUM_BITS > 3 && rte_cpu_get_flag_enabled(RTE_CPUFLAG_AVX2)) + table->lookup_fn = EFD_LOOKUP_AVX2; + else +#endif + table->lookup_fn = EFD_LOOKUP_SCALAR; /* * Allocate the EFD table offline portion (with the actual rules @@ -1253,6 +1266,13 @@ efd_lookup_internal(const struct efd_online_group_entry * const group, switch (lookup_fn) { +#if defined(RTE_ARCH_X86) + case EFD_LOOKUP_AVX2: + return efd_lookup_internal_avx2(group->hash_idx, + group->lookup_table, + hash_val_a, + hash_val_b); +#endif case EFD_LOOKUP_SCALAR: /* Fall-through */ default: diff --git a/lib/librte_efd/rte_efd_x86.h b/lib/librte_efd/rte_efd_x86.h new file mode 100644 index 0000000000..34f37d73b7 --- /dev/null +++ b/lib/librte_efd/rte_efd_x86.h @@ -0,0 +1,86 @@ +/*- + * BSD LICENSE + * + * Copyright(c) 2016-2017 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. + */ + +/* rte_efd_x86.h + * This file holds all x86 specific EFD functions + */ +#include + +#if (RTE_EFD_VALUE_NUM_BITS == 8 || RTE_EFD_VALUE_NUM_BITS == 16 || \ + RTE_EFD_VALUE_NUM_BITS == 24 || RTE_EFD_VALUE_NUM_BITS == 32) +#define EFD_LOAD_SI128(val) _mm_load_si128(val) +#else +#define EFD_LOAD_SI128(val) _mm_lddqu_si128(val) +#endif + +static inline efd_value_t +efd_lookup_internal_avx2(const efd_hashfunc_t *group_hash_idx, + const efd_lookuptbl_t *group_lookup_table, + const uint32_t hash_val_a, const uint32_t hash_val_b) +{ +#ifdef RTE_MACHINE_CPUFLAG_AVX2 + efd_value_t value = 0; + uint32_t i = 0; + __m256i vhash_val_a = _mm256_set1_epi32(hash_val_a); + __m256i vhash_val_b = _mm256_set1_epi32(hash_val_b); + + for (; i < RTE_EFD_VALUE_NUM_BITS; i += 8) { + __m256i vhash_idx = + _mm256_cvtepu16_epi32(EFD_LOAD_SI128( + (__m128i const *) &group_hash_idx[i])); + __m256i vlookup_table = _mm256_cvtepu16_epi32( + EFD_LOAD_SI128((__m128i const *) + &group_lookup_table[i])); + __m256i vhash = _mm256_add_epi32(vhash_val_a, + _mm256_mullo_epi32(vhash_idx, vhash_val_b)); + __m256i vbucket_idx = _mm256_srli_epi32(vhash, + EFD_LOOKUPTBL_SHIFT); + __m256i vresult = _mm256_srlv_epi32(vlookup_table, + vbucket_idx); + + value |= (_mm256_movemask_ps( + (__m256) _mm256_slli_epi32(vresult, 31)) + & ((1 << (RTE_EFD_VALUE_NUM_BITS - i)) - 1)) << i; + } + + return value; +#else + RTE_SET_USED(group_hash_idx); + RTE_SET_USED(group_lookup_table); + RTE_SET_USED(hash_val_a); + RTE_SET_USED(hash_val_b); + /* Return dummy value, only to avoid compilation breakage */ + return 0; +#endif + +}