1 files changed, 151 insertions, 0 deletions
diff --git a/hicn-plugin/src/face_db.h b/hicn-plugin/src/face_db.h
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+++ b/hicn-plugin/src/face_db.h
@@ -0,0 +1,151 @@
+/*
+ * Copyright (c) 2017-2020 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 __HICN_FACE_DB_H__
+#define __HICN_FACE_DB_H__
+
+#include <vnet/dpo/dpo.h>
+#include "faces/face.h"
+
+/**
+ * @file face_db.h
+ *
+ * Define a face db that is store in every pit entry. A face db containes a list
+ * of incoming faces for interest packets that are used to forward data packets
+ * on the interests' reverse path
+ */
+
+/* Must be power of two */
+#define HICN_FACE_DB_INLINE_FACES 8
+
+#define HICN_PIT_BITMAP_SIZE_BYTE HICN_PARAM_FACES_MAX/8
+#define HICN_PIT_N_HOP_BITMAP_SIZE HICN_PARAM_FACES_MAX
+
+#define HICN_PIT_N_HOP_BUCKET (HICN_PARAM_PIT_ENTRY_PHOPS_MAX - HICN_FACE_DB_INLINE_FACES)
+
+typedef struct hicn_face_bucket_s
+{
+  /* Array of indexes of virtual faces */
+  hicn_face_id_t faces[HICN_PIT_N_HOP_BUCKET];
+
+  /* Used to check if interests are retransmission */
+  u8 bitmap[HICN_PIT_BITMAP_SIZE_BYTE];
+
+} hicn_face_bucket_t;
+
+extern hicn_face_bucket_t *hicn_face_bucket_pool;
+
+typedef struct __attribute__ ((packed)) hicn_face_db_s
+{
+  /* 19B + 1B = 20B */
+  /* Equal to one or zero */
+  u8 is_overflow;
+
+  /* Number of faces in the last bucket */
+  /* Or next availabe entry for storing a dpo_id_t */
+  /* 20B + 4B = 24B */
+  u32 n_faces;
+
+  /* 24B + 32B (8*4) = 56B */
+  /* Array of indexes of virtual faces */
+  hicn_face_id_t inline_faces[HICN_FACE_DB_INLINE_FACES];
+
+  /* 56B + 4B = 60B */
+  u32 next_bucket;
+
+  /* 60B + 4B = 64B */
+  u32 align;
+  //align back to 64
+
+} hicn_face_db_t;
+
+always_inline hicn_face_id_t
+hicn_face_db_get_dpo_face (u32 index, hicn_face_db_t * face_db)
+{
+  ASSERT (index < face_db->n_faces);
+
+  return index < HICN_FACE_DB_INLINE_FACES ? (face_db->inline_faces[index]) :
+    (pool_elt_at_index (hicn_face_bucket_pool, face_db->next_bucket)->faces
+      [(index - HICN_FACE_DB_INLINE_FACES) & (HICN_PIT_N_HOP_BUCKET - 1)]);
+}
+
+always_inline void
+hicn_face_db_init (int max_element)
+{
+  pool_init_fixed (hicn_face_bucket_pool, max_element);
+}
+
+always_inline hicn_face_bucket_t *
+hicn_face_db_get_bucket (u32 bucket_index)
+{
+  return pool_elt_at_index (hicn_face_bucket_pool, bucket_index);
+}
+
+always_inline void
+hicn_face_db_add_face (hicn_face_id_t face_id, hicn_face_db_t * face_db)
+{
+  //ASSERT (dpo->dpoi_index != ~0);
+
+  hicn_face_bucket_t *faces_bkt =
+    pool_elt_at_index (hicn_face_bucket_pool, face_db->next_bucket);
+
+  hicn_face_id_t *element =
+    face_db->n_faces <
+    HICN_FACE_DB_INLINE_FACES ? &(face_db->inline_faces[face_db->n_faces]) :
+    &(faces_bkt->faces
+      [(face_db->n_faces -
+	HICN_FACE_DB_INLINE_FACES) & (HICN_PIT_N_HOP_BUCKET - 1)]);
+
+  *element = face_id;
+
+  u32 bitmap_index = face_id % HICN_PIT_N_HOP_BITMAP_SIZE;
+  u32 position_array = bitmap_index / 8;
+  u8 bit_index = (u8) (bitmap_index - position_array * 8);
+
+  faces_bkt->bitmap[position_array] |= (0x01 << bit_index);
+  face_db->n_faces++;
+}
+
+always_inline u8
+hicn_face_search (hicn_face_id_t index, hicn_face_db_t * face_db)
+{
+  hicn_face_bucket_t *faces_bkt =
+    pool_elt_at_index (hicn_face_bucket_pool, face_db->next_bucket);
+  u32 bitmap_index = index % HICN_PIT_N_HOP_BITMAP_SIZE;
+
+  u32 position_array = bitmap_index / 8;
+  u8 bit_index = bitmap_index - position_array * 8;
+
+  return (faces_bkt->bitmap[position_array] >> bit_index) & 0x01;
+}
+
+always_inline void
+hicn_faces_flush (hicn_face_db_t * face_db)
+{
+  hicn_face_bucket_t *faces_bkt =
+    pool_elt_at_index (hicn_face_bucket_pool, face_db->next_bucket);
+  clib_memset_u8 (&(faces_bkt->bitmap), 0, HICN_PIT_BITMAP_SIZE_BYTE);
+  face_db->n_faces = 0;
+  pool_put_index (hicn_face_bucket_pool, face_db->next_bucket);
+}
+
+
+#endif /* // __HICN_FACE_DB_H__ */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables: eval: (c-set-style "gnu") End:
+ */