1 files changed, 84 insertions, 0 deletions
diff --git a/src/plugins/linux-cp/lcp_adj.h b/src/plugins/linux-cp/lcp_adj.h
new file mode 100644
index 00000000000..006d183461e
--- /dev/null
+++ b/src/plugins/linux-cp/lcp_adj.h
@@ -0,0 +1,84 @@
+/*
+ * 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