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tcpconnlat.c
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tcpconnlat.c
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// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
// Copyright (c) 2020 Wenbo Zhang
//
// Based on tcpconnlat(8) from BCC by Brendan Gregg.
// 11-Jul-2020 Wenbo Zhang Created this.
#include <argp.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <unistd.h>
#include <time.h>
#include <bpf/libbpf.h>
#include <bpf/bpf.h>
#include "tcpconnlat.h"
#include "tcpconnlat.skel.h"
#include "trace_helpers.h"
#define PERF_BUFFER_PAGES 16
#define PERF_POLL_TIMEOUT_MS 100
static struct env {
__u64 min_us;
pid_t pid;
bool timestamp;
bool verbose;
} env;
const char *argp_program_version = "tcpconnlat 0.1";
const char *argp_program_bug_address =
"https://github.com/iovisor/bcc/tree/master/libbpf-tools";
const char argp_program_doc[] =
"\nTrace TCP connects and show connection latency.\n"
"\n"
"USAGE: tcpconnlat [--help] [-t] [-p PID]\n"
"\n"
"EXAMPLES:\n"
" tcpconnlat # summarize on-CPU time as a histogram"
" tcpconnlat 1 # trace connection latency slower than 1 ms"
" tcpconnlat 0.1 # trace connection latency slower than 100 us"
" tcpconnlat -t # 1s summaries, milliseconds, and timestamps"
" tcpconnlat -p 185 # trace PID 185 only";
static const struct argp_option opts[] = {
{ "timestamp", 't', NULL, 0, "Include timestamp on output" },
{ "pid", 'p', "PID", 0, "Trace this PID only" },
{ "verbose", 'v', NULL, 0, "Verbose debug output" },
{},
};
static error_t parse_arg(int key, char *arg, struct argp_state *state)
{
static int pos_args;
switch (key) {
case 'v':
env.verbose = true;
break;
case 'p':
errno = 0;
env.pid = strtol(arg, NULL, 10);
if (errno) {
fprintf(stderr, "invalid PID: %s\n", arg);
argp_usage(state);
}
break;
case 't':
env.timestamp = true;
break;
case ARGP_KEY_ARG:
if (pos_args++) {
fprintf(stderr,
"Unrecognized positional argument: %s\n", arg);
argp_usage(state);
}
errno = 0;
env.min_us = strtod(arg, NULL) * 1000;
if (errno || env.min_us <= 0) {
fprintf(stderr, "Invalid delay (in us): %s\n", arg);
argp_usage(state);
}
break;
default:
return ARGP_ERR_UNKNOWN;
}
return 0;
}
int libbpf_print_fn(enum libbpf_print_level level,
const char *format, va_list args)
{
if (level == LIBBPF_DEBUG && !env.verbose)
return 0;
return vfprintf(stderr, format, args);
}
void handle_event(void *ctx, int cpu, void *data, __u32 data_sz)
{
const struct event *e = data;
char src[INET6_ADDRSTRLEN];
char dst[INET6_ADDRSTRLEN];
union {
struct in_addr x4;
struct in6_addr x6;
} s, d;
static __u64 start_ts;
if (env.timestamp) {
if (start_ts == 0)
start_ts = e->ts_us;
printf("%-9.3f ", (e->ts_us - start_ts) / 1000000.0);
}
if (e->af == AF_INET) {
s.x4.s_addr = e->saddr_v4;
d.x4.s_addr = e->daddr_v4;
} else if (e->af == AF_INET6) {
memcpy(&s.x6.s6_addr, e->saddr_v6, sizeof(s.x6.s6_addr));
memcpy(&d.x6.s6_addr, e->daddr_v6, sizeof(d.x6.s6_addr));
} else {
fprintf(stderr, "broken event: event->af=%d", e->af);
return;
}
printf("%-6d %-12.12s %-2d %-16s %-16s %-5d %.2f\n", e->tgid, e->comm,
e->af == AF_INET ? 4 : 6, inet_ntop(e->af, &s, src, sizeof(src)),
inet_ntop(e->af, &d, dst, sizeof(dst)), ntohs(e->dport),
e->delta_us / 1000.0);
}
void handle_lost_events(void *ctx, int cpu, __u64 lost_cnt)
{
fprintf(stderr, "lost %llu events on CPU #%d\n", lost_cnt, cpu);
}
int main(int argc, char **argv)
{
static const struct argp argp = {
.options = opts,
.parser = parse_arg,
.doc = argp_program_doc,
};
struct perf_buffer_opts pb_opts;
struct perf_buffer *pb = NULL;
struct tcpconnlat_bpf *obj;
int err;
err = argp_parse(&argp, argc, argv, 0, NULL, NULL);
if (err)
return err;
libbpf_set_print(libbpf_print_fn);
err = bump_memlock_rlimit();
if (err) {
fprintf(stderr, "failed to increase rlimit: %d\n", err);
return 1;
}
obj = tcpconnlat_bpf__open();
if (!obj) {
fprintf(stderr, "failed to open BPF object\n");
return 1;
}
/* initialize global data (filtering options) */
obj->rodata->targ_min_us = env.min_us;
obj->rodata->targ_tgid = env.pid;
err = tcpconnlat_bpf__load(obj);
if (err) {
fprintf(stderr, "failed to load BPF object: %d\n", err);
goto cleanup;
}
err = tcpconnlat_bpf__attach(obj);
if (err) {
goto cleanup;
}
pb_opts.sample_cb = handle_event;
pb_opts.lost_cb = handle_lost_events;
pb = perf_buffer__new(bpf_map__fd(obj->maps.events), PERF_BUFFER_PAGES,
&pb_opts);
err = libbpf_get_error(pb);
if (err) {
pb = NULL;
fprintf(stderr, "failed to open perf buffer: %d\n", err);
goto cleanup;
}
if (env.timestamp)
printf("%-9s ", ("TIME(s)"));
printf("%-6s %-12s %-2s %-16s %-16s %-5s %s\n",
"PID", "COMM", "IP", "SADDR", "DADDR", "DPORT", "LAT(ms)");
/* main: poll */
while (1) {
if ((err = perf_buffer__poll(pb, PERF_POLL_TIMEOUT_MS)) < 0)
break;
}
printf("error polling perf buffer: %d\n", err);
cleanup:
tcpconnlat_bpf__destroy(obj);
return err != 0;
}