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/*
* Copyright (c) 2017-2019 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
*
* 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 4
#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 */
dpo_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 */
dpo_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 dpo_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_dpo (dpo_id_t * dpo, 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);
dpo_id_t *face =
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)]);
clib_memcpy (face, dpo, sizeof (dpo_id_t));
/* This access the dpoi to increase the lock */
dpo_lock (dpo);
u32 bitmap_index = dpo->dpoi_index % 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 (dpo_id_t * dpo, 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 = dpo->dpoi_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:
*/
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