hash.h

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/*
 * SPDX-License-Identifier: Apache-2.0
 * Copyright(c) 2021 Cisco Systems, Inc.
 */
 
#ifndef __VNET_HASH_H__
#define __VNET_HASH_H__
 
#include <vlib/vlib.h>
 
#define foreach_vnet_hash_fn_types                                            \
  _ (ETHERNET, 0, "hash-fn-ethernet")                                         \
  _ (IP, 1, "hash-fn-ip")
 
typedef enum
{
#define _(f, n, s) VNET_HASH_FN_TYPE_##f,
  foreach_vnet_hash_fn_types
#undef _
    VNET_HASH_FN_TYPE_N,
} vnet_hash_fn_type_t;
 
typedef void (*vnet_hash_fn_t) (void **p, u32 *h, u32 n_packets);
 
typedef struct vnet_hash_function_registration
{
  const char *name;
  const char *description;
  int priority;
  vnet_hash_fn_t function[VNET_HASH_FN_TYPE_N];
 
  struct vnet_hash_function_registration *next;
} vnet_hash_function_registration_t;
 
typedef struct
{
  vnet_hash_function_registration_t *hash_registrations;
} vnet_hash_main_t;
 
extern vnet_hash_main_t vnet_hash_main;
 
#define VNET_REGISTER_HASH_FUNCTION(x, ...)                                   \
  __VA_ARGS__ vnet_hash_function_registration_t __vnet_hash_function_##x;     \
  static void __clib_constructor __vnet_hash_function_registration_##x (void) \
  {                                                                           \
    vnet_hash_main_t *hm = &vnet_hash_main;                                   \
    __vnet_hash_function_##x.next = hm->hash_registrations;                   \
    hm->hash_registrations = &__vnet_hash_function_##x;                       \
  }                                                                           \
  __VA_ARGS__ vnet_hash_function_registration_t __vnet_hash_function_##x
 
vnet_hash_fn_t vnet_hash_default_function (vnet_hash_fn_type_t ftype);
vnet_hash_fn_t vnet_hash_function_from_name (const char *name,
                                             vnet_hash_fn_type_t ftype);
vnet_hash_function_registration_t *
vnet_hash_function_from_func (vnet_hash_fn_t fn, vnet_hash_fn_type_t ftype);
format_function_t format_vnet_hash;
 
#endif