vpp/vlib-api/vlibapi/api.h

/*
 *------------------------------------------------------------------
 * api.h
 * 
 * Copyright (c) 2009-2015 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 included_api_h
#define included_api_h

#include <vppinfra/error.h>
#include <svm.h>
#include <vlib/vlib.h>
#include <vlibmemory/unix_shared_memory_queue.h>
#include <vlib/unix/unix.h>

typedef enum {
    REGISTRATION_TYPE_FREE=0,
    REGISTRATION_TYPE_SHMEM,
    REGISTRATION_TYPE_SOCKET_LISTEN,
    REGISTRATION_TYPE_SOCKET_SERVER,
    REGISTRATION_TYPE_SOCKET_CLIENT,
} vl_registration_type_t;

typedef struct vl_api_registration_ {
    vl_registration_type_t registration_type;

    /* Index in VLIB's brain (not shared memory). */
    u32 vl_api_registration_pool_index;
    
    u8 *name;

    /*
     * The following groups of data could be unioned, but my fingers are
     * going to be sore enough.
     */

    /* shared memory only */
    unix_shared_memory_queue_t *vl_input_queue;

    /* socket server and client */
    u32 unix_file_index;
    i8 * unprocessed_input;
    u32 unprocessed_msg_length;
    u8 * output_vector;

    /* socket client only */
    u32 server_handle;
    u32 server_index;

} vl_api_registration_t;


/* Trace configuration for a single message */
typedef struct {
    int size;
    int trace_enable;
    int replay_enable;
} trace_cfg_t;

/*
 * API recording
 */
typedef struct {
    u8 endian;
    u8 enabled;
    u8 wrapped;
    u8 pad;
    u32 nitems;
    u32 curindex;
    u8 **traces;
} vl_api_trace_t;

typedef CLIB_PACKED (struct {
    u8 endian;
    u8 wrapped;
    u32 nitems;
}) vl_api_trace_file_header_t;

typedef enum {
    VL_API_TRACE_TX,
    VL_API_TRACE_RX,
} vl_api_trace_which_t;

#define VL_API_LITTLE_ENDIAN 0x00
#define VL_API_BIG_ENDIAN 0x01

typedef struct {
    u8 * name;
    u16 first_msg_id;
    u16 last_msg_id;
} vl_api_msg_range_t;

typedef struct {
    void (**msg_handlers)(void *);
    int  (**pd_msg_handlers)(void *, int);
    void (**msg_cleanup_handlers)(void *);
    void (**msg_endian_handlers)(void *);
    void (**msg_print_handlers)(void *, void *);
    char **msg_names;
    u8 *message_bounce;
    u8 *is_mp_safe;
    struct ring_alloc_ *arings;
    u32 ring_misses;
    u32 missing_clients;
    vl_api_trace_t *rx_trace;
    vl_api_trace_t *tx_trace;
    int msg_print_flag;
    trace_cfg_t *api_trace_cfg;
    int our_pid;
    svm_region_t *vlib_rp;
    svm_region_t **mapped_shmem_regions;
    struct vl_shmem_hdr_ *shmem_hdr;
    vl_api_registration_t **vl_clients;

    /* For plugin msg allocator */
    u16 first_available_msg_id;

    /* message range by name hash */
    uword * msg_range_by_name;

    /* vector of message ranges */
    vl_api_msg_range_t *msg_ranges;

    /* Client-only data structures */
    unix_shared_memory_queue_t *vl_input_queue;

    /*
     * All VLIB-side message handlers use my_client_index to identify 
     * the queue / client. This works in sim replay.
     */
    int my_client_index;
    /*
     * This is the (shared VM) address of the registration,
     * don't use it to id the connection since it can't possibly
     * work in simulator replay.
     */
    vl_api_registration_t *my_registration;

    i32 vlib_signal;

    char *region_name;
    char *root_path;
} api_main_t;

api_main_t api_main;

typedef struct {
    int id;
    char *name;
    void *handler;
    void *cleanup;
    void *endian;
    void *print;
    int size;
    int traced;
    int replay;
    int message_bounce;
    int is_mp_safe;
} vl_msg_api_msg_config_t;

/* api_shared.c prototypes */
int vl_msg_api_rx_trace_enabled(api_main_t *am);
int vl_msg_api_tx_trace_enabled(api_main_t *am);
void vl_msg_api_trace(api_main_t *am, vl_api_trace_t *tp, void *msg);
int vl_msg_api_trace_onoff(api_main_t *am, vl_api_trace_which_t which, 
                           int onoff);
int vl_msg_api_trace_free(api_main_t *am, vl_api_trace_which_t which);
int vl_msg_api_trace_save(api_main_t *am, 
                          vl_api_trace_which_t which, FILE *fp);
int vl_msg_api_trace_configure(api_main_t *am, vl_api_trace_which_t which, 
                               u32 nitems);
void vl_msg_api_handler_with_vm_node (api_main_t *am, 
                                      void *the_msg, vlib_main_t *vm, 
                                      vlib_node_runtime_t *node);
void vl_msg_api_handler (void *the_msg);
void vl_msg_api_handler_no_free (void *the_msg);
void vl_msg_api_handler_no_trace_no_free (void *the_msg);
void vl_msg_api_trace_only (void *the_msg);
void vl_msg_api_cleanup_handler (void *the_msg);
void vl_msg_api_replay_handler(void *the_msg);
void vl_msg_api_socket_handler(void *the_msg);
void vl_msg_api_set_handlers(int msg_id, char *msg_name, 
                             void *handler, 
                             void *cleanup,
                             void *endian,
                             void *print,
                             int msg_size, int traced);
void vl_msg_api_config (vl_msg_api_msg_config_t *);
void vl_msg_api_set_cleanup_handler(int msg_id, void *fp);
void vl_msg_api_queue_handler(unix_shared_memory_queue_t *q);
vl_api_trace_t *vl_msg_api_trace_get(api_main_t *am, 
                                     vl_api_trace_which_t which);

void vl_msg_api_free (void *);
void vl_noop_handler (void *mp);
clib_error_t *vl_api_init (vlib_main_t *vm);
void vl_msg_api_increment_missing_client_counter(void);
void vl_msg_api_post_mortem_dump (void);
void vl_msg_api_register_pd_handler (void *handler, u16 msg_id_host_byte_order);
int vl_msg_api_pd_handler (void *mp, int rv);

void vl_msg_api_set_first_available_msg_id (u16 first_avail);
u16 vl_msg_api_get_msg_ids (char * name, int n);

#define VLIB_API_INIT_FUNCTION(x) VLIB_DECLARE_INIT_FUNCTION(x,api_init)

#endif /* included_api_h */