libbpf-tools/tcppktlat.c - platform/external/bcc - Git at Google

 // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
 // Copyright (c) 2023 Wenbo Zhang
 #include <argp.h>
 #include <signal.h>
 #include <stdio.h>
 #include <unistd.h>
 #include <fcntl.h>
 #include <time.h>
 #include <arpa/inet.h>
 #include <sys/socket.h>
 #include <sys/resource.h>

 #include <bpf/bpf.h>
 #include <bpf/libbpf.h>
 #include "tcppktlat.h"
 #include "tcppktlat.skel.h"
 #include "compat.h"
 #include "trace_helpers.h"

 static struct env {
 	pid_t pid;
 	pid_t tid;
 	__u64 min_us;
 	__u16 lport;
 	__u16 rport;
 	bool timestamp;
 	bool verbose;
 } env = {};

 static volatile sig_atomic_t exiting = 0;
 static int column_width = 15;

 const char *argp_program_version = "tcppktlat 0.1";
 const char *argp_program_bug_address =
 	"https://github.com/iovisor/bcc/tree/master/libbpf-tools";
 const char argp_program_doc[] =
 "Trace latency between TCP received pkt and picked up by userspace thread.\n"
 "\n"
 "USAGE: tcppktlat [--help] [-T] [-p PID] [-t TID] [-l LPORT] [-r RPORT] [-w] [-v]\n"
 "\n"
 "EXAMPLES:\n"
 "    tcppktlat             # Trace all TCP packet picked up latency\n"
 "    tcppktlat -T          # summarize with timestamps\n"
 "    tcppktlat -p          # filter for pid\n"
 "    tcppktlat -t          # filter for tid\n"
 "    tcppktlat -l          # filter for local port\n"
 "    tcppktlat -r          # filter for remote port\n"
 "    tcppktlat 1000        # filter for latency higher than 1000us";

 static const struct argp_option opts[] = {
 	{ "pid", 'p', "PID", 0, "Process PID to trace"},
 	{ "tid", 't', "TID", 0, "Thread TID to trace"},
 	{ "timestamp", 'T', NULL, 0, "include timestamp on output" },
 	{ "lport", 'l', "LPORT", 0, "filter for local port" },
 	{ "rport", 'r', "RPORT", 0, "filter for remote port" },
 	{ "verbose", 'v', NULL, 0, "Verbose debug output" },
 	{ "wide", 'w', NULL, 0, "Wide column output (fits IPv6 addresses)" },
 	{ NULL, 'h', NULL, OPTION_HIDDEN, "Show the full help" },
 	{},
 };

 static error_t parse_arg(int key, char *arg, struct argp_state *state)
 {
 	static int pos_args;
 	long long min_us;
 	int pid;

 	switch (key) {
 	case 'h':
 		argp_state_help(state, stderr, ARGP_HELP_STD_HELP);
 		break;
 	case 'v':
 		env.verbose = true;
 		break;
 	case 'T':
 		env.timestamp = true;
 		break;
 	case 'p':
 		errno = 0;
 		pid = strtol(arg, NULL, 10);
 		if (errno || pid <= 0) {
 			fprintf(stderr, "Invalid PID: %s\n", arg);
 			argp_usage(state);
 		}
 		env.pid = pid;
 		break;
 	case 't':
 		errno = 0;
 		pid = strtol(arg, NULL, 10);
 		if (errno || pid <= 0) {
 			fprintf(stderr, "Invalid TID: %s\n", arg);
 			argp_usage(state);
 		}
 		env.tid = pid;
 		break;
 	case 'l':
 		errno = 0;
 		env.lport = strtoul(arg, NULL, 10);
 		if (errno) {
 			fprintf(stderr, "invalid lport: %s\n", arg);
 			argp_usage(state);
 		}
 		env.lport = htons(env.lport);
 		break;
 	case 'r':
 		errno = 0;
 		env.rport = strtoul(arg, NULL, 10);
 		if (errno) {
 			fprintf(stderr, "invalid rport: %s\n", arg);
 			argp_usage(state);
 		}
 		env.rport = htons(env.rport);
 		break;
 	case 'w':
 		column_width = 26;
 		break;
 	case ARGP_KEY_ARG:
 		if (pos_args++) {
 			fprintf(stderr,
 				"Unrecognized positional argument: %s\n", arg);
 			argp_usage(state);
 		}
 		errno = 0;
 		min_us = strtoll(arg, NULL, 10);
 		if (errno || min_us <= 0) {
 			fprintf(stderr, "Invalid delay (in us): %s\n", arg);
 			argp_usage(state);
 		}
 		env.min_us = min_us;
 		break;
 	default:
 		return ARGP_ERR_UNKNOWN;
 	}
 	return 0;
 }

 static 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);
 }

 static void sig_int(int signo)
 {
 	exiting = 1;
 }

 static int handle_event(void *ctx, void *data, size_t data_sz)
 {
 	const struct event *e = data;
 	char saddr[48], daddr[48];
 	struct tm *tm;
 	char ts[32];
 	time_t t;

 	if (env.timestamp) {
 		time(&t);
 		tm = localtime(&t);
 		strftime(ts, sizeof(ts), "%H:%M:%S", tm);
 		printf("%-8s ", ts);
 	}
 	inet_ntop(e->family, &e->saddr, saddr, sizeof(saddr));
 	inet_ntop(e->family, &e->daddr, daddr, sizeof(daddr));

 	printf("%-7d %-7d %-16s %-*s %-5d %-*s %-5d %-.2f\n",
 		e->pid, e->tid, e->comm, column_width, saddr, ntohs(e->sport), column_width, daddr,
 		ntohs(e->dport), e->delta_us / 1000.0);

 	return 0;
 }

 static 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 bpf_buffer *buf = NULL;
 	struct tcppktlat_bpf *obj;
 	int err;

 	err = argp_parse(&argp, argc, argv, 0, NULL, NULL);
 	if (err)
 		return err;

 	libbpf_set_print(libbpf_print_fn);

 	obj = tcppktlat_bpf__open();
 	if (!obj) {
 		fprintf(stderr, "failed to open BPF object\n");
 		return 1;
 	}

 	obj->rodata->targ_pid = env.pid;
 	obj->rodata->targ_tid = env.tid;
 	obj->rodata->targ_sport = env.lport;
 	obj->rodata->targ_dport = env.rport;
 	obj->rodata->targ_min_us = env.min_us;

 	buf = bpf_buffer__new(obj->maps.events, obj->maps.heap);
 	if (!buf) {
 		err = -errno;
 		fprintf(stderr, "failed to create ring/perf buffer: %d\n", err);
 		goto cleanup;
 	}

 	if (probe_tp_btf("tcp_probe")) {
 		bpf_program__set_autoload(obj->progs.tcp_probe, false);
 		bpf_program__set_autoload(obj->progs.tcp_rcv_space_adjust, false);
 		bpf_program__set_autoload(obj->progs.tcp_destroy_sock, false);
 	} else {
 		bpf_program__set_autoload(obj->progs.tcp_probe_btf, false);
 		bpf_program__set_autoload(obj->progs.tcp_rcv_space_adjust_btf, false);
 		bpf_program__set_autoload(obj->progs.tcp_destroy_sock_btf, false);
 	}

 	err = tcppktlat_bpf__load(obj);
 	if (err) {
 		fprintf(stderr, "failed to load BPF object: %d, maybe your kernel doesn't support `bpf_get_socket_cookie`\n", err);
 		goto cleanup;
 	}

 	err = tcppktlat_bpf__attach(obj);
 	if (err) {
 		fprintf(stderr, "failed to attach BPF object: %d\n", err);
 		goto cleanup;
 	}

 	err = bpf_buffer__open(buf, handle_event, handle_lost_events, NULL);
 	if (err) {
 		fprintf(stderr, "failed to open ring/perf buffer: %d\n", err);
 		goto cleanup;
 	}

 	if (signal(SIGINT, sig_int) == SIG_ERR) {
 		fprintf(stderr, "can't set signal handler: %s\n", strerror(errno));
 		err = 1;
 		goto cleanup;
 	}

 	if (env.timestamp)
 		printf("%-8s ", "TIME(s)");
 	printf("%-7s %-7s %-16s %-*s %-5s %-*s %-5s %-s\n",
 		"PID", "TID", "COMM", column_width, "LADDR", "LPORT", column_width, "RADDR", "RPORT", "MS");

 	while (!exiting) {
 		err = bpf_buffer__poll(buf, POLL_TIMEOUT_MS);
 		if (err < 0 && err != -EINTR) {
 			fprintf(stderr, "error polling ring/perf buffer: %s\n", strerror(-err));
 			goto cleanup;
 		}
 		/* reset err to return 0 if exiting */
 		err = 0;
 	}
 cleanup:
 	bpf_buffer__free(buf);
 	tcppktlat_bpf__destroy(obj);

 	return err != 0;
 }
	// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
	// Copyright (c) 2023 Wenbo Zhang
	#include <argp.h>
	#include <signal.h>
	#include <stdio.h>
	#include <unistd.h>
	#include <fcntl.h>
	#include <time.h>
	#include <arpa/inet.h>
	#include <sys/socket.h>
	#include <sys/resource.h>

	#include <bpf/bpf.h>
	#include <bpf/libbpf.h>
	#include "tcppktlat.h"
	#include "tcppktlat.skel.h"
	#include "compat.h"
	#include "trace_helpers.h"

	static struct env {
	pid_t pid;
	pid_t tid;
	__u64 min_us;
	__u16 lport;
	__u16 rport;
	bool timestamp;
	bool verbose;
	} env = {};

	static volatile sig_atomic_t exiting = 0;
	static int column_width = 15;

	const char *argp_program_version = "tcppktlat 0.1";
	const char *argp_program_bug_address =
	"https://github.com/iovisor/bcc/tree/master/libbpf-tools";
	const char argp_program_doc[] =
	"Trace latency between TCP received pkt and picked up by userspace thread.\n"
	"\n"
	"USAGE: tcppktlat [--help] [-T] [-p PID] [-t TID] [-l LPORT] [-r RPORT] [-w] [-v]\n"
	"\n"
	"EXAMPLES:\n"
	" tcppktlat # Trace all TCP packet picked up latency\n"
	" tcppktlat -T # summarize with timestamps\n"
	" tcppktlat -p # filter for pid\n"
	" tcppktlat -t # filter for tid\n"
	" tcppktlat -l # filter for local port\n"
	" tcppktlat -r # filter for remote port\n"
	" tcppktlat 1000 # filter for latency higher than 1000us";

	static const struct argp_option opts[] = {
	{ "pid", 'p', "PID", 0, "Process PID to trace"},
	{ "tid", 't', "TID", 0, "Thread TID to trace"},
	{ "timestamp", 'T', NULL, 0, "include timestamp on output" },
	{ "lport", 'l', "LPORT", 0, "filter for local port" },
	{ "rport", 'r', "RPORT", 0, "filter for remote port" },
	{ "verbose", 'v', NULL, 0, "Verbose debug output" },
	{ "wide", 'w', NULL, 0, "Wide column output (fits IPv6 addresses)" },
	{ NULL, 'h', NULL, OPTION_HIDDEN, "Show the full help" },
	{},
	};

	static error_t parse_arg(int key, char arg, struct argp_state state)
	{
	static int pos_args;
	long long min_us;
	int pid;

	switch (key) {
	case 'h':
	argp_state_help(state, stderr, ARGP_HELP_STD_HELP);
	break;
	case 'v':
	env.verbose = true;
	break;
	case 'T':
	env.timestamp = true;
	break;
	case 'p':
	errno = 0;
	pid = strtol(arg, NULL, 10);
	if (errno \|\| pid <= 0) {
	fprintf(stderr, "Invalid PID: %s\n", arg);
	argp_usage(state);
	}
	env.pid = pid;
	break;
	case 't':
	errno = 0;
	pid = strtol(arg, NULL, 10);
	if (errno \|\| pid <= 0) {
	fprintf(stderr, "Invalid TID: %s\n", arg);
	argp_usage(state);
	}
	env.tid = pid;
	break;
	case 'l':
	errno = 0;
	env.lport = strtoul(arg, NULL, 10);
	if (errno) {
	fprintf(stderr, "invalid lport: %s\n", arg);
	argp_usage(state);
	}
	env.lport = htons(env.lport);
	break;
	case 'r':
	errno = 0;
	env.rport = strtoul(arg, NULL, 10);
	if (errno) {
	fprintf(stderr, "invalid rport: %s\n", arg);
	argp_usage(state);
	}
	env.rport = htons(env.rport);
	break;
	case 'w':
	column_width = 26;
	break;
	case ARGP_KEY_ARG:
	if (pos_args++) {
	fprintf(stderr,
	"Unrecognized positional argument: %s\n", arg);
	argp_usage(state);
	}
	errno = 0;
	min_us = strtoll(arg, NULL, 10);
	if (errno \|\| min_us <= 0) {
	fprintf(stderr, "Invalid delay (in us): %s\n", arg);
	argp_usage(state);
	}
	env.min_us = min_us;
	break;
	default:
	return ARGP_ERR_UNKNOWN;
	}
	return 0;
	}

	static 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);
	}

	static void sig_int(int signo)
	{
	exiting = 1;
	}

	static int handle_event(void ctx, void data, size_t data_sz)
	{
	const struct event *e = data;
	char saddr[48], daddr[48];
	struct tm *tm;
	char ts[32];
	time_t t;

	if (env.timestamp) {
	time(&t);
	tm = localtime(&t);
	strftime(ts, sizeof(ts), "%H:%M:%S", tm);
	printf("%-8s ", ts);
	}
	inet_ntop(e->family, &e->saddr, saddr, sizeof(saddr));
	inet_ntop(e->family, &e->daddr, daddr, sizeof(daddr));

	printf("%-7d %-7d %-16s %-s %-5d %-s %-5d %-.2f\n",
	e->pid, e->tid, e->comm, column_width, saddr, ntohs(e->sport), column_width, daddr,
	ntohs(e->dport), e->delta_us / 1000.0);

	return 0;
	}

	static 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 bpf_buffer *buf = NULL;
	struct tcppktlat_bpf *obj;
	int err;

	err = argp_parse(&argp, argc, argv, 0, NULL, NULL);
	if (err)
	return err;

	libbpf_set_print(libbpf_print_fn);

	obj = tcppktlat_bpf__open();
	if (!obj) {
	fprintf(stderr, "failed to open BPF object\n");
	return 1;
	}

	obj->rodata->targ_pid = env.pid;
	obj->rodata->targ_tid = env.tid;
	obj->rodata->targ_sport = env.lport;
	obj->rodata->targ_dport = env.rport;
	obj->rodata->targ_min_us = env.min_us;

	buf = bpf_buffer__new(obj->maps.events, obj->maps.heap);
	if (!buf) {
	err = -errno;
	fprintf(stderr, "failed to create ring/perf buffer: %d\n", err);
	goto cleanup;
	}

	if (probe_tp_btf("tcp_probe")) {
	bpf_program__set_autoload(obj->progs.tcp_probe, false);
	bpf_program__set_autoload(obj->progs.tcp_rcv_space_adjust, false);
	bpf_program__set_autoload(obj->progs.tcp_destroy_sock, false);
	} else {
	bpf_program__set_autoload(obj->progs.tcp_probe_btf, false);
	bpf_program__set_autoload(obj->progs.tcp_rcv_space_adjust_btf, false);
	bpf_program__set_autoload(obj->progs.tcp_destroy_sock_btf, false);
	}

	err = tcppktlat_bpf__load(obj);
	if (err) {
	fprintf(stderr, "failed to load BPF object: %d, maybe your kernel doesn't support `bpf_get_socket_cookie`\n", err);
	goto cleanup;
	}

	err = tcppktlat_bpf__attach(obj);
	if (err) {
	fprintf(stderr, "failed to attach BPF object: %d\n", err);
	goto cleanup;
	}

	err = bpf_buffer__open(buf, handle_event, handle_lost_events, NULL);
	if (err) {
	fprintf(stderr, "failed to open ring/perf buffer: %d\n", err);
	goto cleanup;
	}

	if (signal(SIGINT, sig_int) == SIG_ERR) {
	fprintf(stderr, "can't set signal handler: %s\n", strerror(errno));
	err = 1;
	goto cleanup;
	}

	if (env.timestamp)
	printf("%-8s ", "TIME(s)");
	printf("%-7s %-7s %-16s %-s %-5s %-s %-5s %-s\n",
	"PID", "TID", "COMM", column_width, "LADDR", "LPORT", column_width, "RADDR", "RPORT", "MS");

	while (!exiting) {
	err = bpf_buffer__poll(buf, POLL_TIMEOUT_MS);
	if (err < 0 && err != -EINTR) {
	fprintf(stderr, "error polling ring/perf buffer: %s\n", strerror(-err));
	goto cleanup;
	}
	/* reset err to return 0 if exiting */
	err = 0;
	}
	cleanup:
	bpf_buffer__free(buf);
	tcppktlat_bpf__destroy(obj);

	return err != 0;
	}