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/*
* Copyright (c) 2016 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.
*/
/*
* ioam_export_thread.c
*/
#include <vnet/api_errno.h>
#include <vppinfra/pool.h>
#include "ioam_export.h"
static vlib_node_registration_t ioam_export_process_node;
#define EXPORT_TIMEOUT (20.0)
#define THREAD_PERIOD (30.0)
static uword
ioam_export_process (vlib_main_t * vm,
vlib_node_runtime_t * rt, vlib_frame_t * f)
{
ioam_export_main_t *em = &ioam_export_main;
f64 now;
f64 timeout = 30.0;
uword event_type;
uword *event_data = 0;
int i;
ioam_export_buffer_t *eb = 0, *new_eb = 0;
u32 *vec_buffer_indices = 0;
u32 *vec_buffer_to_be_sent = 0;
u32 *thread_index = 0;
u32 new_pool_index = 0;
em->export_process_node_index = ioam_export_process_node.index;
/* Wait for Godot... */
vlib_process_wait_for_event_or_clock (vm, 1e9);
event_type = vlib_process_get_events (vm, &event_data);
if (event_type != 1)
clib_warning ("bogus kickoff event received, %d", event_type);
vec_reset_length (event_data);
while (1)
{
vlib_process_wait_for_event_or_clock (vm, timeout);
event_type = vlib_process_get_events (vm, &event_data);
switch (event_type)
{
case 2: /* Stop and Wait for kickoff again */
timeout = 1e9;
break;
case 1: /* kickoff : Check for unsent buffers */
timeout = THREAD_PERIOD;
break;
case ~0: /* timeout */
break;
}
vec_reset_length (event_data);
now = vlib_time_now (vm);
/*
* Create buffers for threads that are not active enough
* to send out the export records
*/
for (i = 0; i < vec_len (em->buffer_per_thread); i++)
{
/* If the worker thread is processing export records ignore further checks */
if (*em->lockp[i] == 1)
continue;
eb = pool_elt_at_index (em->buffer_pool, em->buffer_per_thread[i]);
if (eb->records_in_this_buffer > 0 && now > (eb->touched_at + EXPORT_TIMEOUT))
{
pool_get_aligned (em->buffer_pool, new_eb,
CLIB_CACHE_LINE_BYTES);
memset (new_eb, 0, sizeof (*new_eb));
if (ioam_export_init_buffer (vm, new_eb) == 1)
{
new_pool_index = new_eb - em->buffer_pool;
vec_add (vec_buffer_indices, &new_pool_index, 1);
vec_add (vec_buffer_to_be_sent, &em->buffer_per_thread[i],
1);
vec_add (thread_index, &i, 1);
}
else
{
pool_put (em->buffer_pool, new_eb);
/*Give up */
goto CLEANUP;
}
}
}
if (vec_len (thread_index) != 0)
{
/*
* Now swap the buffers out
*/
for (i = 0; i < vec_len (thread_index); i++)
{
while (__sync_lock_test_and_set (em->lockp[thread_index[i]], 1))
;
em->buffer_per_thread[thread_index[i]] =
vec_pop (vec_buffer_indices);
*em->lockp[thread_index[i]] = 0;
}
/* Send the buffers */
for (i = 0; i < vec_len (vec_buffer_to_be_sent); i++)
{
eb =
pool_elt_at_index (em->buffer_pool, vec_buffer_to_be_sent[i]);
ioam_export_send_buffer (vm, eb);
pool_put (em->buffer_pool, eb);
}
}
CLEANUP:
/* Free any leftover/unused buffers and everything that was allocated */
for (i = 0; i < vec_len (vec_buffer_indices); i++)
{
new_eb = pool_elt_at_index (em->buffer_pool, vec_buffer_indices[i]);
vlib_buffer_free (vm, &new_eb->buffer_index, 1);
pool_put (em->buffer_pool, new_eb);
}
vec_free (vec_buffer_indices);
vec_free (vec_buffer_to_be_sent);
vec_free (thread_index);
}
return 0; /* not so much */
}
VLIB_REGISTER_NODE (ioam_export_process_node, static) =
{
.function = ioam_export_process,
.type = VLIB_NODE_TYPE_PROCESS,
.name = "ioam-export-process",
};
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