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/* SPDX-License-Identifier: Apache-2.0
* Copyright(c) 2022 Cisco Systems, Inc.
*/
#include <vlib/vlib.h>
#include <vlib/unix/unix.h>
#include <vlib/stats/stats.h>
#define STAT_SEGMENT_SOCKET_FILENAME "stats.sock"
static u32 vlib_loops_stats_counter_index;
static void
vector_rate_collector_fn (vlib_stats_collector_data_t *d)
{
vlib_main_t *this_vlib_main;
counter_t **counters, **loops_counters;
counter_t *cb, *loops_cb;
f64 vector_rate = 0.0;
u32 i, n_threads = vlib_get_n_threads ();
vlib_stats_validate (d->entry_index, 0, n_threads - 1);
counters = d->entry->data;
cb = counters[0];
vlib_stats_validate (vlib_loops_stats_counter_index, 0, n_threads - 1);
loops_counters =
vlib_stats_get_entry_data_pointer (vlib_loops_stats_counter_index);
loops_cb = loops_counters[0];
for (i = 0; i < n_threads; i++)
{
f64 this_vector_rate;
this_vlib_main = vlib_get_main_by_index (i);
this_vector_rate = vlib_internal_node_vector_rate (this_vlib_main);
vlib_clear_internal_node_vector_rate (this_vlib_main);
cb[i] = this_vector_rate;
vector_rate += this_vector_rate;
loops_cb[i] = this_vlib_main->loops_per_second;
}
/* And set the system average rate */
vector_rate /= (f64) (i > 1 ? i - 1 : 1);
vlib_stats_set_gauge (d->private_data, vector_rate);
}
clib_error_t *
vlib_stats_init (vlib_main_t *vm)
{
vlib_stats_segment_t *sm = vlib_stats_get_segment ();
vlib_stats_shared_header_t *shared_header;
vlib_stats_collector_reg_t reg = {};
uword memory_size, sys_page_sz;
int mfd;
char *mem_name = "stat segment";
void *heap, *memaddr;
memory_size = sm->memory_size;
if (memory_size == 0)
memory_size = STAT_SEGMENT_DEFAULT_SIZE;
if (sm->log2_page_sz == CLIB_MEM_PAGE_SZ_UNKNOWN)
sm->log2_page_sz = CLIB_MEM_PAGE_SZ_DEFAULT;
mfd = clib_mem_vm_create_fd (sm->log2_page_sz, mem_name);
if (mfd == -1)
return clib_error_return (0, "stat segment memory fd failure: %U",
format_clib_error, clib_mem_get_last_error ());
/* Set size */
if ((ftruncate (mfd, memory_size)) == -1)
{
close (mfd);
return clib_error_return (0, "stat segment ftruncate failure");
}
memaddr = clib_mem_vm_map_shared (0, memory_size, mfd, 0, mem_name);
if (memaddr == CLIB_MEM_VM_MAP_FAILED)
return clib_error_return (0, "stat segment mmap failure");
sys_page_sz = clib_mem_get_page_size ();
heap =
clib_mem_create_heap (((u8 *) memaddr) + sys_page_sz,
memory_size - sys_page_sz, 1 /* locked */, mem_name);
sm->heap = heap;
sm->memfd = mfd;
sm->directory_vector_by_name = hash_create_string (0, sizeof (uword));
sm->shared_header = shared_header = memaddr;
shared_header->version = STAT_SEGMENT_VERSION;
shared_header->base = memaddr;
sm->stat_segment_lockp = clib_mem_alloc (sizeof (clib_spinlock_t));
sm->locking_thread_index = ~0;
sm->n_locks = 0;
clib_spinlock_init (sm->stat_segment_lockp);
/* Set up the name to counter-vector hash table */
sm->directory_vector =
vec_new_heap (typeof (sm->directory_vector[0]), STAT_COUNTERS, heap);
sm->dir_vector_first_free_elt = CLIB_U32_MAX;
shared_header->epoch = 1;
/* Scalar stats and node counters */
#define _(E, t, n, p) \
strcpy (sm->directory_vector[STAT_COUNTER_##E].name, p "/" #n); \
sm->directory_vector[STAT_COUNTER_##E].type = STAT_DIR_TYPE_##t;
foreach_stat_segment_counter_name
#undef _
/* Save the vector in the shared segment, for clients */
shared_header->directory_vector = sm->directory_vector;
vlib_stats_register_mem_heap (heap);
reg.collect_fn = vector_rate_collector_fn;
reg.private_data = vlib_stats_add_gauge ("/sys/vector_rate");
reg.entry_index =
vlib_stats_add_counter_vector ("/sys/vector_rate_per_worker");
vlib_loops_stats_counter_index =
vlib_stats_add_counter_vector ("/sys/loops_per_worker");
vlib_stats_register_collector_fn (®);
vlib_stats_validate (reg.entry_index, 0, vlib_get_n_threads ());
vlib_stats_validate (vlib_loops_stats_counter_index, 0,
vlib_get_n_threads ());
return 0;
}
static clib_error_t *
statseg_config (vlib_main_t *vm, unformat_input_t *input)
{
vlib_stats_segment_t *sm = vlib_stats_get_segment ();
sm->update_interval = 10.0;
while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (input, "socket-name %s", &sm->socket_name))
;
/* DEPRECATE: default (does nothing) */
else if (unformat (input, "default"))
;
else if (unformat (input, "size %U", unformat_memory_size,
&sm->memory_size))
;
else if (unformat (input, "page-size %U", unformat_log2_page_size,
&sm->log2_page_sz))
;
else if (unformat (input, "per-node-counters on"))
sm->node_counters_enabled = 1;
else if (unformat (input, "per-node-counters off"))
sm->node_counters_enabled = 0;
else if (unformat (input, "update-interval %f", &sm->update_interval))
;
else
return clib_error_return (0, "unknown input `%U'",
format_unformat_error, input);
}
/*
* NULL-terminate socket name string
* clib_socket_init()->socket_config() use C str*
*/
if (vec_len (sm->socket_name))
vec_terminate_c_string (sm->socket_name);
return 0;
}
VLIB_EARLY_CONFIG_FUNCTION (statseg_config, "statseg");
/*
* Accept connection on the socket and exchange the fd for the shared
* memory segment.
*/
static clib_error_t *
stats_socket_accept_ready (clib_file_t *uf)
{
vlib_stats_segment_t *sm = vlib_stats_get_segment ();
clib_error_t *err;
clib_socket_t client = { 0 };
err = clib_socket_accept (sm->socket, &client);
if (err)
{
clib_error_report (err);
return err;
}
/* Send the fd across and close */
err = clib_socket_sendmsg (&client, 0, 0, &sm->memfd, 1);
if (err)
clib_error_report (err);
clib_socket_close (&client);
return 0;
}
static clib_error_t *
stats_segment_socket_init (void)
{
vlib_stats_segment_t *sm = vlib_stats_get_segment ();
clib_error_t *error;
clib_socket_t *s = clib_mem_alloc (sizeof (clib_socket_t));
memset (s, 0, sizeof (clib_socket_t));
s->config = (char *) sm->socket_name;
s->flags = CLIB_SOCKET_F_IS_SERVER | CLIB_SOCKET_F_SEQPACKET |
CLIB_SOCKET_F_ALLOW_GROUP_WRITE | CLIB_SOCKET_F_PASSCRED;
if ((error = clib_socket_init (s)))
return error;
clib_file_t template = { 0 };
template.read_function = stats_socket_accept_ready;
template.file_descriptor = s->fd;
template.description = format (0, "stats segment listener %s", s->config);
clib_file_add (&file_main, &template);
sm->socket = s;
return 0;
}
static clib_error_t *
stats_segment_socket_exit (vlib_main_t *vm)
{
/*
* cleanup the listener socket on exit.
*/
vlib_stats_segment_t *sm = vlib_stats_get_segment ();
unlink ((char *) sm->socket_name);
return 0;
}
VLIB_MAIN_LOOP_EXIT_FUNCTION (stats_segment_socket_exit);
static clib_error_t *
statseg_init (vlib_main_t *vm)
{
vlib_stats_segment_t *sm = vlib_stats_get_segment ();
/* set default socket file name when statseg config stanza is empty. */
if (!vec_len (sm->socket_name))
sm->socket_name = format (0, "%s/%s%c", vlib_unix_get_runtime_dir (),
STAT_SEGMENT_SOCKET_FILENAME, 0);
return stats_segment_socket_init ();
}
VLIB_INIT_FUNCTION (statseg_init) = {
.runs_after = VLIB_INITS ("unix_input_init", "linux_epoll_input_init"),
};
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