DPDK  17.05.2
examples/ip_pipeline/thread.c
/*-
* BSD LICENSE
*
* Copyright(c) 2010-2015 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <rte_common.h>
#include <rte_cycles.h>
#include <rte_pipeline.h>
#include "pipeline_common_be.h"
#include "app.h"
#include "thread.h"
#if APP_THREAD_HEADROOM_STATS_COLLECT
#define PIPELINE_RUN_REGULAR(thread, pipeline) \
do { \
uint64_t t0 = rte_rdtsc_precise(); \
int n_pkts = rte_pipeline_run(pipeline->p); \
\
if (n_pkts == 0) { \
uint64_t t1 = rte_rdtsc_precise(); \
\
thread->headroom_cycles += t1 - t0; \
} \
} while (0)
#define PIPELINE_RUN_CUSTOM(thread, data) \
do { \
uint64_t t0 = rte_rdtsc_precise(); \
int n_pkts = data->f_run(data->be); \
\
if (n_pkts == 0) { \
uint64_t t1 = rte_rdtsc_precise(); \
\
thread->headroom_cycles += t1 - t0; \
} \
} while (0)
#else
#define PIPELINE_RUN_REGULAR(thread, pipeline) \
rte_pipeline_run(pipeline->p)
#define PIPELINE_RUN_CUSTOM(thread, data) \
data->f_run(data->be)
#endif
static inline void *
thread_msg_recv(struct rte_ring *r)
{
void *msg;
int status = rte_ring_sc_dequeue(r, &msg);
if (status != 0)
return NULL;
return msg;
}
static inline void
thread_msg_send(struct rte_ring *r,
void *msg)
{
int status;
do {
status = rte_ring_sp_enqueue(r, msg);
} while (status == -ENOBUFS);
}
static int
thread_pipeline_enable(struct app_thread_data *t,
struct thread_pipeline_enable_msg_req *req)
{
struct app_thread_pipeline_data *p;
if (req->f_run == NULL) {
if (t->n_regular >= APP_MAX_THREAD_PIPELINES)
return -1;
} else {
if (t->n_custom >= APP_MAX_THREAD_PIPELINES)
return -1;
}
p = (req->f_run == NULL) ?
&t->regular[t->n_regular] :
&t->custom[t->n_custom];
p->pipeline_id = req->pipeline_id;
p->be = req->be;
p->f_run = req->f_run;
p->f_timer = req->f_timer;
p->timer_period = req->timer_period;
p->deadline = 0;
if (req->f_run == NULL)
t->n_regular++;
else
t->n_custom++;
return 0;
}
static int
thread_pipeline_disable(struct app_thread_data *t,
struct thread_pipeline_disable_msg_req *req)
{
uint32_t n_regular = RTE_MIN(t->n_regular, RTE_DIM(t->regular));
uint32_t n_custom = RTE_MIN(t->n_custom, RTE_DIM(t->custom));
uint32_t i;
/* search regular pipelines of current thread */
for (i = 0; i < n_regular; i++) {
if (t->regular[i].pipeline_id != req->pipeline_id)
continue;
if (i < n_regular - 1)
memcpy(&t->regular[i],
&t->regular[i+1],
(n_regular - 1 - i) * sizeof(struct app_thread_pipeline_data));
n_regular--;
t->n_regular = n_regular;
return 0;
}
/* search custom pipelines of current thread */
for (i = 0; i < n_custom; i++) {
if (t->custom[i].pipeline_id != req->pipeline_id)
continue;
if (i < n_custom - 1)
memcpy(&t->custom[i],
&t->custom[i+1],
(n_custom - 1 - i) * sizeof(struct app_thread_pipeline_data));
n_custom--;
t->n_custom = n_custom;
return 0;
}
/* return if pipeline not found */
return -1;
}
static int
thread_msg_req_handle(struct app_thread_data *t)
{
void *msg_ptr;
struct thread_msg_req *req;
struct thread_msg_rsp *rsp;
msg_ptr = thread_msg_recv(t->msgq_in);
req = msg_ptr;
rsp = msg_ptr;
if (req != NULL)
switch (req->type) {
case THREAD_MSG_REQ_PIPELINE_ENABLE: {
rsp->status = thread_pipeline_enable(t,
(struct thread_pipeline_enable_msg_req *) req);
thread_msg_send(t->msgq_out, rsp);
break;
}
case THREAD_MSG_REQ_PIPELINE_DISABLE: {
rsp->status = thread_pipeline_disable(t,
(struct thread_pipeline_disable_msg_req *) req);
thread_msg_send(t->msgq_out, rsp);
break;
}
case THREAD_MSG_REQ_HEADROOM_READ: {
struct thread_headroom_read_msg_rsp *rsp =
(struct thread_headroom_read_msg_rsp *)
req;
rsp->headroom_ratio = t->headroom_ratio;
rsp->status = 0;
thread_msg_send(t->msgq_out, rsp);
break;
}
default:
break;
}
return 0;
}
static void
thread_headroom_update(struct app_thread_data *t, uint64_t time)
{
uint64_t time_diff = time - t->headroom_time;
t->headroom_ratio =
((double) t->headroom_cycles) / ((double) time_diff);
t->headroom_cycles = 0;
t->headroom_time = rte_rdtsc_precise();
}
int
app_thread(void *arg)
{
struct app_params *app = (struct app_params *) arg;
uint32_t core_id = rte_lcore_id(), i, j;
struct app_thread_data *t = &app->thread_data[core_id];
for (i = 0; ; i++) {
uint32_t n_regular = RTE_MIN(t->n_regular, RTE_DIM(t->regular));
uint32_t n_custom = RTE_MIN(t->n_custom, RTE_DIM(t->custom));
/* Run regular pipelines */
for (j = 0; j < n_regular; j++) {
struct app_thread_pipeline_data *data = &t->regular[j];
struct pipeline *p = data->be;
PIPELINE_RUN_REGULAR(t, p);
}
/* Run custom pipelines */
for (j = 0; j < n_custom; j++) {
struct app_thread_pipeline_data *data = &t->custom[j];
PIPELINE_RUN_CUSTOM(t, data);
}
/* Timer */
if ((i & 0xF) == 0) {
uint64_t time = rte_get_tsc_cycles();
uint64_t t_deadline = UINT64_MAX;
if (time < t->deadline)
continue;
/* Timer for regular pipelines */
for (j = 0; j < n_regular; j++) {
struct app_thread_pipeline_data *data =
&t->regular[j];
uint64_t p_deadline = data->deadline;
if (p_deadline <= time) {
data->f_timer(data->be);
p_deadline = time + data->timer_period;
data->deadline = p_deadline;
}
if (p_deadline < t_deadline)
t_deadline = p_deadline;
}
/* Timer for custom pipelines */
for (j = 0; j < n_custom; j++) {
struct app_thread_pipeline_data *data =
&t->custom[j];
uint64_t p_deadline = data->deadline;
if (p_deadline <= time) {
data->f_timer(data->be);
p_deadline = time + data->timer_period;
data->deadline = p_deadline;
}
if (p_deadline < t_deadline)
t_deadline = p_deadline;
}
/* Timer for thread message request */
{
uint64_t deadline = t->thread_req_deadline;
if (deadline <= time) {
thread_msg_req_handle(t);
thread_headroom_update(t, time);
deadline = time + t->timer_period;
t->thread_req_deadline = deadline;
}
if (deadline < t_deadline)
t_deadline = deadline;
}
t->deadline = t_deadline;
}
}
return 0;
}