DPDK timer 解析

2024-04-23 23:44
文章标签 解析 dpdk timer

本文主要是介绍DPDK timer 解析，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

1. 编译 DPDK timer

设置环境变量:

  • export RTE_SDK=/home//dpdk/dpdk-stable-19.08.2/
  • export RTE_TARGET=x86_64-native-linux-gcc

源码路径：./dpdk 源码/examples/timer/

编译方法：在上面路径下执行 make

目标文件路径：./dpdk 源码/examples/timer/build/timer

下面是 timer 部分运行结果：

可以看到的是有两个定时器 timer0 和 timer1， timer0 是绑定到当前 cpu 核心一直是 core 0 触发定时器 0，

而 timer1 则是在不同核心触发定时器 1。

EAL: Detected 8 lcore(s)
EAL: Detected 1 NUMA nodes
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'PA'
EAL: Probing VFIO support...
EAL: VFIO support initialized
EAL: PCI device 0000:02:01.0 on NUMA socket -1
EAL:   Invalid NUMA socket, default to 0
EAL:   probe driver: 8086:100f net_e1000_em
EAL: PCI device 0000:02:06.0 on NUMA socket -1
EAL:   Invalid NUMA socket, default to 0
EAL:   probe driver: 8086:100f net_e1000_em
EAL: PCI device 0000:03:00.0 on NUMA socket -1
EAL:   Invalid NUMA socket, default to 0
EAL:   probe driver: 15ad:7b0 net_vmxnet3
EAL: PCI device 0000:0b:00.0 on NUMA socket -1
EAL:   Invalid NUMA socket, default to 0
EAL:   probe driver: 15ad:7b0 net_vmxnet3
Starting mainloop on core 1
Starting mainloop on core 2
Starting mainloop on core 3
Starting mainloop on core 4
Starting mainloop on core 5
Starting mainloop on core 6
Starting mainloop on core 7
Starting mainloop on core 0
timer1_cb() on lcore 1
timer1_cb() on lcore 2
timer0_cb() on lcore 0
timer1_cb() on lcore 3
timer1_cb() on lcore 4
timer1_cb() on lcore 5
timer0_cb() on lcore 0
timer1_cb() on lcore 6
timer1_cb() on lcore 7
timer1_cb() on lcore 0

2. DPDK API 学习

2.1. rte_timer_subsystem_init()

#include <rte_timer.h>
int rte_timer_subsystem_init(void);
//作用：确保定时器子系统被正确初始化，从而保证后续的定时器操作能够正常进行。

2.2. rte_timer_init()

#include <rte_timer.h>
void rte_timer_init(struct rte_timer *tim);
// 作用：初始化一个rte_timer对象

2.3. rte_get_timer_hz()

#include <rte_cycles.h>
uint64_t rte_get_timer_hz(void);
// 作用：函数用于获取系统定时器的频率，即每秒钟CPU时钟周期的数量。

2.4. rte_timer_reset()

#include <rte_timer.h>
void rte_timer_reset(struct rte_timer *tim,uint64_t ticks,enum rte_timer_type type,unsigned lcore_id,rte_timer_cb_t *f,void *arg);
//作用：函数用于重新设置定时器的参数，包括定时器的周期、触发模式、回调函数以及回调函数的参数等
//参数：
/*
tim       ：指向要重新设置的定时器对象的指针。
ticks     ：表示定时器的周期，即定时器触发的时间间隔，单位是CPU时钟周期数。
type      ：表示定时器的触发模式，是一个枚举类型。常见的触发模式有：SINGLE    ：单次触发，定时器只会在下一个周期触发一次，然后停止。PERIODICAL：周期性触发，定时器会在每个周期都触发一次，直到手动停止。
lcore_id  ：表示定时器触发时要在哪个CPU核心上执行回调函数。
f         ：是一个函数指针，指向定时器触发时要执行的回调函数。
arg       ：是传递给回调函数的参数，可以是任意类型的指针，用于传递额外的数据给回调函数
*/

2.5. rte_timer_manage()

#include <rte_timer.h>
void rte_timer_manage(void);
//作用：管理系统中所有的定时器，检查是否有定时器已经到期（即触发），如果有则执行相应的回调函数。

3. 源代码

3.1. 使用 timer0 和 timer1

#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <errno.h>
#include <sys/queue.h>#include <rte_common.h>
#include <rte_memory.h>
#include <rte_launch.h>
#include <rte_eal.h>
#include <rte_per_lcore.h>
#include <rte_lcore.h>
#include <rte_cycles.h>
#include <rte_timer.h>
#include <rte_debug.h>#define TIMER_RESOLUTION_CYCLES 20000000ULL /* around 10ms at 2 Ghz */static struct rte_timer timer0;
static struct rte_timer timer1;/* timer0 callback */
static void timer0_cb(__attribute__((unused)) struct rte_timer *tim, __attribute__((unused)) void *arg)
{static unsigned counter = 0;unsigned lcore_id = rte_lcore_id();printf("%s() on lcore %u\n", __func__, lcore_id);/* this timer is automatically reloaded until we decide to* stop it, when counter reaches 20. */if ((counter ++) == 20)rte_timer_stop(tim);
}/* timer1 callback */
static void timer1_cb(__attribute__((unused)) struct rte_timer *tim, __attribute__((unused)) void *arg)
{unsigned lcore_id = rte_lcore_id();uint64_t hz;printf("%s() on lcore %u\n", __func__, lcore_id);/* reload it on another lcore */hz = rte_get_timer_hz();lcore_id = rte_get_next_lcore(lcore_id, 0, 1);rte_timer_reset(tim, hz/3, SINGLE, lcore_id, timer1_cb, NULL);
}static __attribute__((noreturn)) int lcore_mainloop(__attribute__((unused)) void *arg)
{uint64_t prev_tsc = 0, cur_tsc, diff_tsc;unsigned lcore_id;lcore_id = rte_lcore_id();printf("Starting mainloop on core %u\n", lcore_id);while (1) {/** Call the timer handler on each core: as we don't* need a very precise timer, so only call* rte_timer_manage() every ~10ms (at 2Ghz). In a real* application, this will enhance performances as* reading the HPET timer is not efficient.*/cur_tsc = rte_rdtsc();diff_tsc = cur_tsc - prev_tsc;if (diff_tsc > TIMER_RESOLUTION_CYCLES) {rte_timer_manage();prev_tsc = cur_tsc;}}
}int main(int argc, char **argv)
{int ret;uint64_t hz;unsigned lcore_id;/* init EAL */ret = rte_eal_init(argc, argv);if (ret < 0)rte_panic("Cannot init EAL\n");/* init RTE timer library */rte_timer_subsystem_init();/* init timer structures */rte_timer_init(&timer0);rte_timer_init(&timer1);/* load timer0, every second, on master lcore, reloaded automatically *//* 每秒加载定时器0，绑定当前核心，自动加载 */hz = rte_get_timer_hz();lcore_id = rte_lcore_id();rte_timer_reset(&timer0, hz, PERIODICAL, lcore_id, timer0_cb, NULL);/* load timer1, every second/3, on next lcore, reloaded manually *//* 每3秒加载定时器0，绑定下一个核心，手动加载 */lcore_id = rte_get_next_lcore(lcore_id, 0, 1);rte_timer_reset(&timer1, hz/3, SINGLE, lcore_id, timer1_cb, NULL);/* call lcore_mainloop() on every slave lcore */RTE_LCORE_FOREACH_SLAVE(lcore_id) {rte_eal_remote_launch(lcore_mainloop, NULL, lcore_id);}/* call it on master lcore too */(void) lcore_mainloop(NULL);return 0;
}

3.2. 只使用 timer0

#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <errno.h>
#include <sys/queue.h>#include <rte_common.h>
#include <rte_memory.h>
#include <rte_launch.h>
#include <rte_eal.h>
#include <rte_per_lcore.h>
#include <rte_lcore.h>
#include <rte_cycles.h>
#include <rte_timer.h>
#include <rte_debug.h>#define TIMER_RESOLUTION_CYCLES 20000000ULL /* around 10ms at 2 Ghz */static struct rte_timer timer0;/* timer0 callback */
static void timer0_cb(__attribute__((unused)) struct rte_timer *tim, __attribute__((unused)) void *arg)
{static unsigned counter = 0;unsigned lcore_id = rte_lcore_id();printf("%s() on lcore %u\n", __func__, lcore_id);/* this timer is automatically reloaded until we decide to* stop it, when counter reaches 20. */if ((counter ++) == 20)rte_timer_stop(tim);
}static __attribute__((noreturn)) int lcore_mainloop(__attribute__((unused)) void *arg)
{uint64_t prev_tsc = 0, cur_tsc, diff_tsc;unsigned lcore_id;lcore_id = rte_lcore_id();printf("Starting mainloop on core %u\n", lcore_id);while (1) {/** Call the timer handler on each core: as we don't* need a very precise timer, so only call* rte_timer_manage() every ~10ms (at 2Ghz). In a real* application, this will enhance performances as* reading the HPET timer is not efficient.*/cur_tsc = rte_rdtsc();diff_tsc = cur_tsc - prev_tsc;if (diff_tsc > TIMER_RESOLUTION_CYCLES) {rte_timer_manage();prev_tsc = cur_tsc;}}
}int main(int argc, char **argv)
{int ret;uint64_t hz;unsigned lcore_id;/* init EAL */ret = rte_eal_init(argc, argv);if (ret < 0)rte_panic("Cannot init EAL\n");/* init RTE timer library */rte_timer_subsystem_init();/* init timer structures */rte_timer_init(&timer0);/* load timer0, every second, on master lcore, reloaded automatically *//* 每秒加载定时器0，绑定当前核心，自动加载 */hz = rte_get_timer_hz();lcore_id = rte_lcore_id();rte_timer_reset(&timer0, hz, PERIODICAL, lcore_id, timer0_cb, NULL);/* call lcore_mainloop() on every slave lcore */RTE_LCORE_FOREACH_SLAVE(lcore_id) {rte_eal_remote_launch(lcore_mainloop, NULL, lcore_id);}/* call it on master lcore too */(void) lcore_mainloop(NULL);return 0;
}
EAL: Detected 8 lcore(s)
EAL: Detected 1 NUMA nodes
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'PA'
EAL: Probing VFIO support...
EAL: VFIO support initialized
EAL: PCI device 0000:02:01.0 on NUMA socket -1
EAL:   Invalid NUMA socket, default to 0
EAL:   probe driver: 8086:100f net_e1000_em
EAL: PCI device 0000:02:06.0 on NUMA socket -1
EAL:   Invalid NUMA socket, default to 0
EAL:   probe driver: 8086:100f net_e1000_em
EAL: PCI device 0000:03:00.0 on NUMA socket -1
EAL:   Invalid NUMA socket, default to 0
EAL:   probe driver: 15ad:7b0 net_vmxnet3
EAL: PCI device 0000:0b:00.0 on NUMA socket -1
EAL:   Invalid NUMA socket, default to 0
EAL:   probe driver: 15ad:7b0 net_vmxnet3
Starting mainloop on core 1
Starting mainloop on core 2
Starting mainloop on core 3
Starting mainloop on core 4
Starting mainloop on core 7
Starting mainloop on core 0
Starting mainloop on core 5
Starting mainloop on core 6
timer0_cb() on lcore 0
timer0_cb() on lcore 0
timer0_cb() on lcore 0
timer0_cb() on lcore 0
timer0_cb() on lcore 0
timer0_cb() on lcore 0
timer0_cb() on lcore 0

3.3. 只使用 timer1

#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <errno.h>
#include <sys/queue.h>#include <rte_common.h>
#include <rte_memory.h>
#include <rte_launch.h>
#include <rte_eal.h>
#include <rte_per_lcore.h>
#include <rte_lcore.h>
#include <rte_cycles.h>
#include <rte_timer.h>
#include <rte_debug.h>#define TIMER_RESOLUTION_CYCLES 20000000ULL /* around 10ms at 2 Ghz */static struct rte_timer timer1;/* timer1 callback */
static void timer1_cb(__attribute__((unused)) struct rte_timer *tim, __attribute__((unused)) void *arg)
{unsigned lcore_id = rte_lcore_id();uint64_t hz;printf("%s() on lcore %u\n", __func__, lcore_id);/* reload it on another lcore */hz = rte_get_timer_hz();lcore_id = rte_get_next_lcore(lcore_id, 0, 1);rte_timer_reset(tim, hz/3, SINGLE, lcore_id, timer1_cb, NULL);
}static __attribute__((noreturn)) int lcore_mainloop(__attribute__((unused)) void *arg)
{uint64_t prev_tsc = 0, cur_tsc, diff_tsc;unsigned lcore_id;lcore_id = rte_lcore_id();printf("Starting mainloop on core %u\n", lcore_id);while (1) {/** Call the timer handler on each core: as we don't* need a very precise timer, so only call* rte_timer_manage() every ~10ms (at 2Ghz). In a real* application, this will enhance performances as* reading the HPET timer is not efficient.*/cur_tsc = rte_rdtsc();diff_tsc = cur_tsc - prev_tsc;if (diff_tsc > TIMER_RESOLUTION_CYCLES) {rte_timer_manage();prev_tsc = cur_tsc;}}
}int main(int argc, char **argv)
{int ret;uint64_t hz;unsigned lcore_id;/* init EAL */ret = rte_eal_init(argc, argv);if (ret < 0)rte_panic("Cannot init EAL\n");/* init RTE timer library */rte_timer_subsystem_init();/* init timer structures */rte_timer_init(&timer1);hz = rte_get_timer_hz();lcore_id = rte_get_next_lcore(lcore_id, 0, 1);rte_timer_reset(&timer1, hz/3, SINGLE, lcore_id, timer1_cb, NULL);/* call lcore_mainloop() on every slave lcore */RTE_LCORE_FOREACH_SLAVE(lcore_id) {rte_eal_remote_launch(lcore_mainloop, NULL, lcore_id);}/* call it on master lcore too */(void) lcore_mainloop(NULL);return 0;
}
EAL: Detected 8 lcore(s)
EAL: Detected 1 NUMA nodes
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'PA'
EAL: Probing VFIO support...
EAL: VFIO support initialized
EAL: PCI device 0000:02:01.0 on NUMA socket -1
EAL:   Invalid NUMA socket, default to 0
EAL:   probe driver: 8086:100f net_e1000_em
EAL: PCI device 0000:02:06.0 on NUMA socket -1
EAL:   Invalid NUMA socket, default to 0
EAL:   probe driver: 8086:100f net_e1000_em
EAL: PCI device 0000:03:00.0 on NUMA socket -1
EAL:   Invalid NUMA socket, default to 0
EAL:   probe driver: 15ad:7b0 net_vmxnet3
EAL: PCI device 0000:0b:00.0 on NUMA socket -1
EAL:   Invalid NUMA socket, default to 0
EAL:   probe driver: 15ad:7b0 net_vmxnet3
Starting mainloop on core 1
Starting mainloop on core 3
Starting mainloop on core 4
Starting mainloop on core 5
Starting mainloop on core 2
Starting mainloop on core 6
Starting mainloop on core 7
Starting mainloop on core 0
timer1_cb() on lcore 1
timer1_cb() on lcore 2
timer1_cb() on lcore 3
timer1_cb() on lcore 4
timer1_cb() on lcore 5
timer1_cb() on lcore 6
timer1_cb() on lcore 7
timer1_cb() on lcore 0
timer1_cb() on lcore 1

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