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/*
* stat_client.h - Library for access to VPP statistics segment
*
* Copyright (c) 2018 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_stat_client_h
#define included_stat_client_h
#define STAT_VERSION_MAJOR 1
#define STAT_VERSION_MINOR 2
#include <stdint.h>
#include <unistd.h>
#include <vlib/counter_types.h>
#include <time.h>
#include <stdbool.h>
#include <vlib/stats/shared.h>
/* Default socket to exchange segment fd */
/* TODO: Get from runtime directory */
#define STAT_SEGMENT_SOCKET_FILE "/run/vpp/stats.sock"
#define STAT_SEGMENT_SOCKET_FILENAME "stats.sock"
typedef struct
{
char *name;
stat_directory_type_t type;
bool via_symlink;
union
{
double scalar_value;
counter_t *error_vector;
counter_t **simple_counter_vec;
vlib_counter_t **combined_counter_vec;
uint8_t **name_vector;
};
} stat_segment_data_t;
typedef struct
{
uint64_t current_epoch;
vlib_stats_shared_header_t *shared_header;
vlib_stats_entry_t *directory_vector;
ssize_t memory_size;
uint64_t timeout;
} stat_client_main_t;
extern stat_client_main_t stat_client_main;
stat_client_main_t *stat_client_get (void);
void stat_client_free (stat_client_main_t * sm);
int stat_segment_connect_r (const char *socket_name, stat_client_main_t * sm);
int stat_segment_connect (const char *socket_name);
void stat_segment_disconnect_r (stat_client_main_t * sm);
void stat_segment_disconnect (void);
uint8_t **stat_segment_string_vector (uint8_t ** string_vector,
const char *string);
int stat_segment_vec_len (void *vec);
void stat_segment_vec_free (void *vec);
uint32_t *stat_segment_ls_r (uint8_t ** patterns, stat_client_main_t * sm);
uint32_t *stat_segment_ls (uint8_t ** pattern);
stat_segment_data_t *stat_segment_dump_r (uint32_t * stats,
stat_client_main_t * sm);
stat_segment_data_t *stat_segment_dump (uint32_t * counter_vec);
stat_segment_data_t *stat_segment_dump_entry_r (uint32_t index,
stat_client_main_t * sm);
stat_segment_data_t *stat_segment_dump_entry (uint32_t index);
void stat_segment_data_free (stat_segment_data_t * res);
double stat_segment_heartbeat_r (stat_client_main_t * sm);
double stat_segment_heartbeat (void);
char *stat_segment_index_to_name_r (uint32_t index, stat_client_main_t * sm);
char *stat_segment_index_to_name (uint32_t index);
uint64_t stat_segment_version (void);
uint64_t stat_segment_version_r (stat_client_main_t * sm);
typedef struct
{
uint64_t epoch;
} stat_segment_access_t;
static inline uint64_t
_time_now_nsec (void)
{
struct timespec ts;
clock_gettime (CLOCK_REALTIME, &ts);
return 1e9 * ts.tv_sec + ts.tv_nsec;
}
static inline void *
stat_segment_adjust (stat_client_main_t * sm, void *data)
{
char *csh = (char *) sm->shared_header;
char *p = csh + ((char *) data - (char *) sm->shared_header->base);
if (p > csh && p + sizeof (p) < csh + sm->memory_size)
return (void *) p;
return 0;
}
/*
* Returns 0 on success, -1 on failure (timeout)
*/
static inline int
stat_segment_access_start (stat_segment_access_t * sa,
stat_client_main_t * sm)
{
vlib_stats_shared_header_t *shared_header = sm->shared_header;
uint64_t max_time;
sa->epoch = shared_header->epoch;
if (sm->timeout)
{
max_time = _time_now_nsec () + sm->timeout;
while (shared_header->in_progress != 0 && _time_now_nsec () < max_time)
;
}
else
{
while (shared_header->in_progress != 0)
;
}
sm->directory_vector = (vlib_stats_entry_t *) stat_segment_adjust (
sm, (void *) sm->shared_header->directory_vector);
if (sm->timeout)
return _time_now_nsec () < max_time ? 0 : -1;
return 0;
}
/*
* set maximum number of nano seconds to wait for in_progress state
*/
static inline void
stat_segment_set_timeout_nsec (stat_client_main_t * sm, uint64_t timeout)
{
sm->timeout = timeout;
}
/*
* set maximum number of nano seconds to wait for in_progress state
* this function can be called directly by module using shared stat
* segment
*/
static inline void
stat_segment_set_timeout (uint64_t timeout)
{
stat_client_main_t *sm = &stat_client_main;
stat_segment_set_timeout_nsec (sm, timeout);
}
static inline bool
stat_segment_access_end (stat_segment_access_t * sa, stat_client_main_t * sm)
{
vlib_stats_shared_header_t *shared_header = sm->shared_header;
if (shared_header->epoch != sa->epoch || shared_header->in_progress)
return false;
return true;
}
#endif /* included_stat_client_h */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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