MAP: Add longest matching prefix (LPM) data structures

In preparation for adding input feature MAP support, as opposed to
going via the FIB, add MAP's own LPM data structures.

Change-Id: Ie363f0961b0ac9dde2a0fb76cb0c58c904876974
Signed-off-by: Ole Troan <ot@cisco.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/src/plugins/map/lpm.h b/src/plugins/map/lpm.h
new file mode 100644
index 00000000000..5fe373a4abd
--- /dev/null
+++ b/src/plugins/map/lpm.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2018 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.
+ */
+
+#include <vppinfra/types.h>
+#include <vppinfra/bihash_24_8.h>
+
+enum lpm_type_e {
+  LPM_TYPE_KEY32,
+  LPM_TYPE_KEY128,
+};
+
+typedef struct lpm_ {
+  void (*add) (struct lpm_ *lpm, void *addr_v, u8 pfxlen, u32 value);
+  void (*delete) (struct lpm_ *lpm, void *addr_v, u8 pfxlen);
+  u32 (*lookup) (struct lpm_ *lpm, void *addr_v, u8 pfxlen);
+
+  /* IPv4 LPM */
+  uword *hash[33];
+
+  /* IPv6 LPM */
+  BVT (clib_bihash) bihash;
+  uword *prefix_lengths_bitmap;
+  u32 prefix_length_refcount[129];
+} lpm_t;
+
+lpm_t *lpm_table_init (enum lpm_type_e lpm_type);