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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_H__
#define __HICN_FACE_H__
#include <vnet/vnet.h>
#include <vlib/vlib.h>
#include <vnet/dpo/dpo.h>
#include <vnet/adj/adj_types.h>
typedef u8 hicn_face_flags_t;
typedef index_t hicn_face_id_t;
typedef dpo_type_t hicn_face_type_t;
/**
* @file
*
* @brief Face
*
* This file implements a general face type. A face is carried through nodes as a
* dpo. The face state (hicn_face_t) is the object pointed by the
* dpoi_index in the dpo_id_t (see
* https://docs.fd.io/vpp/18.07/d0/d37/dpo_8h_source.html).
* A face state that does not contain the indication of the l2 adjacency is an
* incomplete face (iface), otherwise it is considered to be complete. Each face type
* provide specific node for processing packets in input or output of complete
* and incomplete faces.
*/
/**
* @brief Fields shared among all the different types of faces
*/
typedef struct __attribute__ ((packed)) hicn_face_shared_s
{
/* Flags to idenfity if the face is incomplete (iface), complete (face) */
/* And a network or application face (1B) */
hicn_face_flags_t flags;
/* Path label (2B) */
u16 pl_id;
/* Number of dpo holding a reference to the dpoi (4B) */
u32 locks;
/* Adjacency for the neighbor (4B) */
adj_index_t adj;
/* local interface for the local ip address */
u32 sw_if;
/* Face id corresponding to the global face pool (4B) */
union
{
hicn_face_type_t face_type;
u32 int_face_type; //To forse the face_type_t to be 4B
};
} hicn_face_shared_t;
/**
* @brief Structure holding the face state. It containes the fields shared among
* all the types of faces as well it leaves some space for storing additional
* information specific to each type.
*/
typedef struct __attribute__ ((packed)) hicn_face_s
{
/* Additional space to fill with face_type specific information */
u8 data[2 * CLIB_CACHE_LINE_BYTES - sizeof (hicn_face_shared_t)];
hicn_face_shared_t shared;
}
hicn_face_t;
/* Pool of faces */
extern hicn_face_t *hicn_dpoi_face_pool;
/* Flags */
/* A face is complete and it stores all the information. A iface lacks of the
adj index, therefore sending a packet through a iface require a lookup in
the FIB. */
#define HICN_FACE_FLAGS_DEFAULT 0x00
#define HICN_FACE_FLAGS_FACE 0x01
#define HICN_FACE_FLAGS_IFACE 0x02
#define HICN_FACE_FLAGS_APPFACE_PROD 0x04 /* Currently only IP face can be appface */
#define HICN_FACE_FLAGS_APPFACE_CONS 0x08 /* Currently only IP face can be appface */
#define HICN_FACE_FLAGS_DELETED 0x10
#define HICN_FACE_NULL (hicn_face_id_t) ~0
/**
* @brief Definition of the virtual functin table for an hICN FACE DPO.
*
* An hICN dpo is a combination of a dpo context (hicn_dpo_ctx or struct that
* extends a hicn_dpo_ctx) and a strategy node. The following virtual function table
* template that glues together the fuction to interact with the context and the
* creating the dpo
*/
typedef struct hicn_face_vft_s
{
u8 *(*format_face) (u8 * s, va_list * args);
/**< Format an hICN face dpo*/
int (*hicn_face_del) (hicn_face_id_t face_id);
void (*hicn_face_get_dpo) (hicn_face_t * face, dpo_id_t * dpo);
} hicn_face_vft_t;
/* Vector maintaining a dpo per face */
extern dpo_id_t *face_dpo_vec;
extern hicn_face_vft_t *face_vft_vec;
/* Vector holding the set of face names */
extern char **face_type_names_vec;
/* First face type registered in the sytem.*/
extern dpo_type_t first_type;
/**
* @brief Return the face id from the face state
*
* @param Pointer to the face state
* @return face id
*/
always_inline hicn_face_id_t
hicn_dpoi_get_index (hicn_face_t * face_dpoi)
{
return face_dpoi - hicn_dpoi_face_pool;
}
/**
* @brief Return the face from the face id. Face id must be valid.
*
* @param dpoi_index Face identifier
* @return Pointer to the face
*/
always_inline hicn_face_t *
hicn_dpoi_get_from_idx (hicn_face_id_t dpoi_index)
{
return (hicn_face_t *) pool_elt_at_index (hicn_dpoi_face_pool, dpoi_index);
}
/**
* @brief Return true if the face id belongs to an existing face
*/
always_inline int
hicn_dpoi_idx_is_valid (hicn_face_id_t face_id)
{
return pool_len (hicn_dpoi_face_pool) > face_id
&& !pool_is_free_index (hicn_dpoi_face_pool, face_id);
}
/**
* @brief Add a lock to the face dpo
*
* @param dpo Pointer to the face dpo
*/
always_inline void
hicn_face_lock (dpo_id_t * dpo)
{
hicn_face_t *face;
face = hicn_dpoi_get_from_idx (dpo->dpoi_index);
face->shared.locks++;
}
/**
* @brief Remove a lock to the face dpo. Deallocate the face id locks == 0
*
* @param dpo Pointer to the face dpo
*/
always_inline void
hicn_face_unlock (dpo_id_t * dpo)
{
hicn_face_t *face;
face = hicn_dpoi_get_from_idx (dpo->dpoi_index);
face->shared.locks--;
}
/**
* @brief Init the internal structures of the face module
*
* Must be called before processing any packet
*/
void hicn_face_module_init (vlib_main_t * vm);
/**
* @brief Format all the existing faces
*
* @param s Pointer to a previous string. If null it will be initialize
* @param n Number of input parameters
* @return String with the faces formatted
*/
u8 *format_hicn_face_all (u8 * s, int n, ...);
/**
* @brief Delete a face
*
* @param face_id Id of the face to delete
* @return HICN_ERROR_FACE_NOT_FOUND if the face does not exist, otherwise
* HICN_ERROR_NONE
*/
int hicn_face_del (hicn_face_id_t face_id);
/**
* @brief Return the virtual function table corresponding to the face type
*
* @param face_type Type of the face
* @return NULL if the face type does not exist
*/
hicn_face_vft_t *hicn_face_get_vft (hicn_face_type_t face_type);
/**
* @brief Register a new face type
*
* @param face_type Type of the face
* @param vft Virtual Function table for the new face type
*/
void register_face_type (hicn_face_type_t face_type, hicn_face_vft_t * vft,
char *name);
#endif // __HICN_FACE_H__
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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