BIER in non-MPLS netowrks

as decsribed in section 2.2
  ihttps://tools.ietf.org/html/draft-ietf-bier-mpls-encapsulation-10
with BIFT encoding from:
  https://tools.ietf.org/html/draft-wijnandsxu-bier-non-mpls-bift-encoding-00

changes:
1 - introduce the new BIFT lookup table. BIER tables that have an associated
    MPLS label are added to the MPLS-FIB. Those that don't are added to the
    BIER table
2 - BIER routes that have no associated output MPLS label will add a BIFT label.
3 - The BIER FMask has a path-list as a member to resolve via any possible path.

Change-Id: I1fd4d9dbd074f0e855c16e9329b81460ebe1efce
Signed-off-by: Neale Ranns <nranns@cisco.com>

1 files changed, 58 insertions, 0 deletions

diff --git a/src/vnet/bier/bier_bift_table.h b/src/vnet/bier/bier_bift_table.h
new file mode 100644
index 00000000000..bc77c37ae3a
--- /dev/null
+++ b/src/vnet/bier/bier_bift_table.h
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2016 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 __BIER_BIFT_TABLE_H__
+#define __BIER_BIFT_TABLE_H__
+
+#include <vnet/dpo/dpo.h>
+#include <vnet/bier/bier_types.h>
+#include <vnet/mpls/packet.h>
+
+/*
+ * the lookup table used to get from a BFIT_ID to a load-balance.
+ * As per-draft draft-ietf-bier-mpls-encapsulation-10 this isthe
+ * use case for non-MPLS networks
+ */
+#define BIER_BIFT_N_ENTRIES (1 << 20)
+typedef struct bier_bfit_table_t_
+{
+    /**
+     * Forwarding information for each BIFT ID
+     */
+    dpo_id_t bblt_dpos[BIER_BIFT_N_ENTRIES];
+
+    /**
+     * The number of entries in the table
+     */
+    u32 bblt_n_entries;
+} bier_bfit_table_t;
+
+
+extern void bier_bift_table_entry_add(bier_bift_id_t id,
+                                      const dpo_id_t *dpo);
+
+extern void bier_bift_table_entry_remove(bier_bift_id_t id);
+
+/**
+ * Global BIFT table
+ */
+extern bier_bfit_table_t *bier_bift_table;
+
+static inline const dpo_id_t*
+bier_bift_dp_lookup (bier_bift_id_t key_host_order)
+{
+    return (&bier_bift_table->bblt_dpos[vnet_mpls_uc_get_label(key_host_order)]);
+}
+#endif