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/*
* Copyright (c) 2020 Intel Corporation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef DPIF_NETDEV_LOOKUP_H
#define DPIF_NETDEV_LOOKUP_H 1
#include <config.h>
#include "dpif-netdev.h"
#include "dpif-netdev-private-dpcls.h"
/* Function to perform a probe for the subtable bit fingerprint.
* Returns NULL if not valid, or a valid function pointer to call for this
* subtable on success.
*/
typedef
dpcls_subtable_lookup_func (*dpcls_subtable_probe_func)(uint32_t u0_bit_count,
uint32_t u1_bit_count);
/* Prototypes for subtable implementations */
dpcls_subtable_lookup_func
dpcls_subtable_autovalidator_probe(uint32_t u0_bit_count,
uint32_t u1_bit_count);
/* Probe function to select a specialized version of the generic lookup
* implementation. This provides performance benefit due to compile-time
* optimizations such as loop-unrolling. These are enabled by the compile-time
* constants in the specific function implementations.
*/
dpcls_subtable_lookup_func
dpcls_subtable_generic_probe(uint32_t u0_bit_count, uint32_t u1_bit_count);
/* Probe function for AVX-512 gather implementation */
dpcls_subtable_lookup_func
dpcls_subtable_avx512_gather_probe(uint32_t u0_bit_cnt, uint32_t u1_bit_cnt);
/* Subtable registration and iteration helpers */
struct dpcls_subtable_lookup_info_t {
/* higher priority gets used over lower values. This allows deployments
* to select the best implementation for the use-case.
*/
uint8_t prio;
/* Probe function: tests if the (u0,u1) combo is supported. If not
* supported, this function returns NULL. If supported, a function pointer
* is returned which when called will perform the lookup on the subtable.
*/
dpcls_subtable_probe_func probe;
/* Human readable name, used in setting subtable priority commands */
const char *name;
};
int32_t dpcls_subtable_set_prio(const char *name, uint8_t priority);
dpcls_subtable_lookup_func
dpcls_subtable_get_best_impl(uint32_t u0_bit_count, uint32_t u1_bit_count);
/* Retrieve the array of lookup implementations for iteration.
* On error, returns a negative number.
* On success, returns the size of the arrays pointed to by the out parameter.
*/
int32_t
dpcls_subtable_lookup_info_get(struct dpcls_subtable_lookup_info_t **out_ptr);
#endif /* dpif-netdev-lookup.h */
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