Basic VPP pingpong example
Test results: - VPP 39us RTT - sockperf kernel 42us RTTmaster
commit
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all: pingpong.c
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gcc -g -O3 -o vpp-pingpong pingpong.c -lvppcom
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#include <stdio.h>
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#include <time.h>
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#include <sys/ioctl.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <strings.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include <netinet/tcp.h>
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#include <errno.h>
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#include <assert.h>
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#include <signal.h>
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#include <vcl/vppcom.h>
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#define MAX_EVENTS 512
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struct epoll_event ev;
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struct epoll_event events[MAX_EVENTS];
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static int message_size = 4096;
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static char *buf = NULL;
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static int epfd = -1;
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static int sockfd = -1;
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static int is_client = 0;
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/* Echo server */
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int loop(void *arg)
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{
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/* Wait for events to happen */
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int nevents = vppcom_epoll_wait(epfd, events, MAX_EVENTS, 0);
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if (nevents < 0)
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{
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return 0;
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}
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int i;
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for (i = 0; i < nevents; ++i)
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{
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/* Handle new connection */
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if (events[i].data.fd == sockfd)
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{
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while (1)
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{
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int nclientfd = vppcom_session_accept(sockfd, NULL, 0);
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if (nclientfd < 0)
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{
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break;
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}
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/* Add to event list */
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ev.data.fd = nclientfd;
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ev.events = EPOLLIN;
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int rv = vppcom_epoll_ctl(epfd, EPOLL_CTL_ADD, nclientfd, &ev);
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if (rv)
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{
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printf("vppcom_epoll_ctl failed: %d\n", rv);
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break;
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}
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}
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}
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else
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{
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if (events[i].events & (EPOLLERR|EPOLLHUP))
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{
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/* Simply close socket */
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vppcom_epoll_ctl(epfd, EPOLL_CTL_DEL, events[i].data.fd, NULL);
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vppcom_session_close(events[i].data.fd);
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}
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else if (events[i].events & EPOLLIN)
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{
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size_t readlen = vppcom_session_read(events[i].data.fd, buf, message_size);
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if (readlen > 0)
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vppcom_session_write(events[i].data.fd, buf, readlen);
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else
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{
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vppcom_epoll_ctl(epfd, EPOLL_CTL_DEL, events[i].data.fd, NULL);
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vppcom_session_close(events[i].data.fd);
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}
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}
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else
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{
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printf("unknown event: %8.8X\n", events[i].events);
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}
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}
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}
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return 0;
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}
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static uint64_t sum_us = 0, count_us = 0;
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static int to_write = 0;
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static int to_read = 0;
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static int connected = 0;
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static struct timespec connect_time;
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static struct timespec start, end;
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void sigint_handler(int signum)
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{
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if (sockfd >= 0)
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{
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vppcom_session_close(sockfd);
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sockfd = 0;
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}
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if (is_client)
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{
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struct timespec stop_time;
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clock_gettime(CLOCK_REALTIME, &stop_time);
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double duration_sec = ((stop_time.tv_nsec - connect_time.tv_nsec)/1000000000.0 + 1.0*(stop_time.tv_sec - connect_time.tv_sec));
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uint64_t mps = count_us/duration_sec;
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printf(
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"%lu messages in %.2f seconds (%lu messages per second), %lu us avg ping-pong\n", count_us,
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duration_sec, mps, sum_us/(count_us == 0 ? 1 : count_us)
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);
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}
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exit(0);
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}
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int loop_client(void *arg)
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{
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ssize_t len = 0;
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int nevents = vppcom_epoll_wait(epfd, events, MAX_EVENTS, 0);
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int i;
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for (i = 0; i < nevents; ++i)
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{
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if (events[i].events & (EPOLLHUP|EPOLLERR))
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{
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/* Simply close socket */
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vppcom_epoll_ctl(epfd, EPOLL_CTL_DEL, events[i].data.fd, NULL);
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vppcom_session_close(events[i].data.fd);
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sigint_handler(SIGINT);
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exit(0);
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}
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else if (events[i].events & EPOLLIN)
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{
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/* Read everything back */
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if (to_read > 0)
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{
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len = vppcom_session_read(events[i].data.fd, buf, message_size);
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if (len > 0)
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to_read = to_read > len ? to_read-len : 0;
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if (to_read == 0)
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{
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/* Calculate latency */
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clock_gettime(CLOCK_REALTIME, &end);
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sum_us += (end.tv_nsec - start.tv_nsec)/1000 + (end.tv_sec - start.tv_sec)*1000000;
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count_us++;
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/* Send next request */
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start = end;
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memset(buf, 0xab, message_size);
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to_write = message_size;
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len = vppcom_session_write(events[i].data.fd, buf, to_write);
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if (len > 0)
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to_write -= len;
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if (to_write == 0)
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to_read = message_size;
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}
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}
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}
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else if (events[i].events & EPOLLOUT)
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{
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/* Connected or buffer available */
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if (!connected)
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{
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connected = 1;
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printf("Connected, starting ping-pong, press Ctrl-C to interrupt\n");
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clock_gettime(CLOCK_REALTIME, &connect_time);
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start = connect_time;
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memset(buf, 0xab, message_size);
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to_write = message_size;
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}
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if (to_write > 0)
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{
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len = vppcom_session_write(events[i].data.fd, buf, to_write);
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if (len > 0)
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to_write -= len;
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if (to_write == 0)
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to_read = message_size;
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}
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}
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else
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{
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printf("unknown event: %8.8X\n", events[i].events);
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}
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}
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return 0;
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}
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int main(int argc, char *argv[])
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{
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char *server = NULL;
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char **f_argv = malloc(sizeof(char*) * (argc+1));
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int f_argidx = 1;
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int rv;
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f_argv[0] = argv[0];
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for (int i = 1; i < argc; i++)
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{
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if (!strcmp(argv[i], "--size"))
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{
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if (i < argc-1)
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message_size = atoi(argv[++i]);
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if (message_size < 4)
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{
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printf("invalid argument for --size\n");
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exit(1);
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}
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}
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else if (argv[i][0] == '-')
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{
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f_argv[f_argidx++] = argv[i++];
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f_argv[f_argidx++] = argv[i];
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}
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else
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{
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server = argv[i];
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break;
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}
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}
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f_argv[f_argidx] = NULL;
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buf = malloc(message_size);
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if (!buf)
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{
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printf("failed to allocate buffer\n");
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exit(1);
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}
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rv = vppcom_app_create("pingpong");
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if (rv)
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{
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printf("vppcom_app_create() failed: %d\n", rv);
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exit(1);
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}
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sockfd = vppcom_session_create(VPPCOM_PROTO_TCP, 1/* is_nonblocking */);
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if (sockfd < 0)
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{
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printf("vppcom_session_create failed: %d\n", sockfd);
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exit(1);
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}
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if (server)
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{
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printf("Client mode, message size %d, connecting to %s port 7777\n", message_size, server);
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is_client = 1;
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struct sockaddr_in my_addr;
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bzero(&my_addr, sizeof(my_addr));
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my_addr.sin_family = AF_INET;
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my_addr.sin_port = htons(7777);
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my_addr.sin_addr.s_addr = inet_addr(server);
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vppcom_endpt_t endpt;
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endpt.is_ip4 = 1;
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endpt.ip = (uint8_t *)&my_addr.sin_addr;
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endpt.port = (uint16_t)my_addr.sin_port;
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rv = vppcom_session_connect(sockfd, &endpt);
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if (rv < 0 && rv != VPPCOM_EINPROGRESS)
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{
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printf("vppcom_session_connect failed: %d\n", rv);
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exit(1);
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}
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}
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else
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{
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printf("Server mode, listening on port 7777 and echoing everything back\n");
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struct sockaddr_in my_addr;
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bzero(&my_addr, sizeof(my_addr));
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my_addr.sin_family = AF_INET;
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my_addr.sin_port = htons(7777);
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my_addr.sin_addr.s_addr = htonl(INADDR_ANY);
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vppcom_endpt_t endpt;
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endpt.is_ip4 = 1;
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endpt.ip = (uint8_t *)&my_addr.sin_addr;
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endpt.port = (uint16_t)my_addr.sin_port;
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rv = vppcom_session_bind(sockfd, &endpt);
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if (rv < 0)
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{
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printf("vppcom_session_bind() failed: %d", rv);
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exit(1);
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}
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rv = vppcom_session_listen(sockfd, MAX_EVENTS);
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if (rv < 0)
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{
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printf("vppcom_session_listen() failed: %d", rv);
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exit(1);
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}
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}
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assert((epfd = vppcom_epoll_create()) > 0);
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ev.data.fd = sockfd;
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ev.events = (server ? EPOLLOUT : 0) | EPOLLIN|EPOLLHUP;
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rv = vppcom_epoll_ctl(epfd, EPOLL_CTL_ADD, sockfd, &ev);
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if (rv < 0)
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{
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printf("vppcom_epoll_ctl() failed: %d", rv);
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exit(1);
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}
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signal(SIGINT, sigint_handler);
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if (server)
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while (1)
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loop_client(NULL);
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else
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while (1)
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loop(NULL);
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vppcom_app_destroy();
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return 0;
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}
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