lcp_adj.h

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/*
 * Copyright (c) 2020 Cisco and/or its affiliates.
 * 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 __LCP_ADJ_DELEGATE_H__
#define __LCP_ADJ_DELEGATE_H__

#include <vppinfra/bihash_32_8.h>

typedef struct lcp_adj_key_t_
{
  u32 sw_if_index;
  u8 rewrite[28];
} lcp_adj_key_t;

STATIC_ASSERT (sizeof (lcp_adj_key_t) == 32, "LCP ADJ Key size changed");

typedef struct lcp_adj_kv_t_
{
  union
  {
    BVT (clib_bihash_kv) kv;
    struct
    {
      lcp_adj_key_t k;
      u64 v;
    };
  };
} lcp_adj_kv_t;

STATIC_ASSERT (sizeof (lcp_adj_kv_t) == sizeof (BVT (clib_bihash_kv)),
               "LCP ADJ Key size changed");

/**
 * The table of adjacencies indexed by the rewrite string
 */
extern BVT (clib_bihash) lcp_adj_tbl;

static_always_inline void
lcp_adj_mk_key (const u8 *rewrite, u8 len, u32 sw_if_index, lcp_adj_key_t *key)
{
  /*
   * Construct the key from the provided rewrite, then pad with zeros
   * to ensure the key does not have garbage bytes
   */
  ASSERT (len <= sizeof (key->rewrite));
  clib_memcpy_fast (key->rewrite, rewrite, len);
  clib_memset (key->rewrite + len, 0, sizeof (key->rewrite) - len);
  key->sw_if_index = sw_if_index;
}

static_always_inline adj_index_t
lcp_adj_lkup (const u8 *rewrite, u8 len, u32 sw_if_index)
{
  lcp_adj_kv_t kv;

  lcp_adj_mk_key (rewrite, len, sw_if_index, &kv.k);

  if (!BV (clib_bihash_search_inline) (&lcp_adj_tbl, &kv.kv))
    return (kv.v);

  return (ADJ_INDEX_INVALID);
}

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */

#endif