From 8ac6c7a54ed1b98d142dce24b11c6de6a1e239a5 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 22 Oct 2024 10:36:11 +0000
Subject: [PATCH] 修改4g拨号为QMI,需要在系统里后台执行quectel-CM
---
kernel/samples/bpf/trace_event_user.c | 150 ++++++++++++++++++++++++++++++++-----------------
1 files changed, 98 insertions(+), 52 deletions(-)
diff --git a/kernel/samples/bpf/trace_event_user.c b/kernel/samples/bpf/trace_event_user.c
index d330224..ac1ba36 100644
--- a/kernel/samples/bpf/trace_event_user.c
+++ b/kernel/samples/bpf/trace_event_user.c
@@ -1,30 +1,27 @@
+// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2016 Facebook
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License as published by the Free Software Foundation.
*/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
-#include <fcntl.h>
-#include <poll.h>
-#include <sys/ioctl.h>
#include <linux/perf_event.h>
#include <linux/bpf.h>
#include <signal.h>
-#include <assert.h>
#include <errno.h>
#include <sys/resource.h>
-#include "libbpf.h"
-#include "bpf_load.h"
+#include <bpf/bpf.h>
+#include <bpf/libbpf.h>
#include "perf-sys.h"
#include "trace_helpers.h"
#define SAMPLE_FREQ 50
+static int pid;
+/* counts, stackmap */
+static int map_fd[2];
+struct bpf_program *prog;
static bool sys_read_seen, sys_write_seen;
static void print_ksym(__u64 addr)
@@ -34,6 +31,11 @@
if (!addr)
return;
sym = ksym_search(addr);
+ if (!sym) {
+ printf("ksym not found. Is kallsyms loaded?\n");
+ return;
+ }
+
printf("%s;", sym->name);
if (!strstr(sym->name, "sys_read"))
sys_read_seen = true;
@@ -89,10 +91,10 @@
}
}
-static void int_exit(int sig)
+static void err_exit(int err)
{
- kill(0, SIGKILL);
- exit(0);
+ kill(pid, SIGKILL);
+ exit(err);
}
static void print_stacks(void)
@@ -100,7 +102,7 @@
struct key_t key = {}, next_key;
__u64 value;
__u32 stackid = 0, next_id;
- int fd = map_fd[0], stack_map = map_fd[1];
+ int error = 1, fd = map_fd[0], stack_map = map_fd[1];
sys_read_seen = sys_write_seen = false;
while (bpf_map_get_next_key(fd, &key, &next_key) == 0) {
@@ -112,7 +114,7 @@
printf("\n");
if (!sys_read_seen || !sys_write_seen) {
printf("BUG kernel stack doesn't contain sys_read() and sys_write()\n");
- int_exit(0);
+ err_exit(error);
}
/* clear stack map */
@@ -134,43 +136,52 @@
static void test_perf_event_all_cpu(struct perf_event_attr *attr)
{
- int nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
- int *pmu_fd = malloc(nr_cpus * sizeof(int));
- int i, error = 0;
+ int nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
+ struct bpf_link **links = calloc(nr_cpus, sizeof(struct bpf_link *));
+ int i, pmu_fd, error = 1;
+
+ if (!links) {
+ printf("malloc of links failed\n");
+ goto err;
+ }
/* system wide perf event, no need to inherit */
attr->inherit = 0;
/* open perf_event on all cpus */
for (i = 0; i < nr_cpus; i++) {
- pmu_fd[i] = sys_perf_event_open(attr, -1, i, -1, 0);
- if (pmu_fd[i] < 0) {
+ pmu_fd = sys_perf_event_open(attr, -1, i, -1, 0);
+ if (pmu_fd < 0) {
printf("sys_perf_event_open failed\n");
- error = 1;
goto all_cpu_err;
}
- assert(ioctl(pmu_fd[i], PERF_EVENT_IOC_SET_BPF, prog_fd[0]) == 0);
- assert(ioctl(pmu_fd[i], PERF_EVENT_IOC_ENABLE) == 0);
+ links[i] = bpf_program__attach_perf_event(prog, pmu_fd);
+ if (libbpf_get_error(links[i])) {
+ printf("bpf_program__attach_perf_event failed\n");
+ links[i] = NULL;
+ close(pmu_fd);
+ goto all_cpu_err;
+ }
}
- if (generate_load() < 0) {
- error = 1;
+ if (generate_load() < 0)
goto all_cpu_err;
- }
+
print_stacks();
+ error = 0;
all_cpu_err:
- for (i--; i >= 0; i--) {
- ioctl(pmu_fd[i], PERF_EVENT_IOC_DISABLE);
- close(pmu_fd[i]);
- }
- free(pmu_fd);
+ for (i--; i >= 0; i--)
+ bpf_link__destroy(links[i]);
+err:
+ free(links);
if (error)
- int_exit(0);
+ err_exit(error);
}
static void test_perf_event_task(struct perf_event_attr *attr)
{
- int pmu_fd, error = 0;
+ struct bpf_link *link = NULL;
+ int pmu_fd, error = 1;
/* per task perf event, enable inherit so the "dd ..." command can be traced properly.
* Enabling inherit will cause bpf_perf_prog_read_time helper failure.
@@ -181,21 +192,25 @@
pmu_fd = sys_perf_event_open(attr, 0, -1, -1, 0);
if (pmu_fd < 0) {
printf("sys_perf_event_open failed\n");
- int_exit(0);
- }
- assert(ioctl(pmu_fd, PERF_EVENT_IOC_SET_BPF, prog_fd[0]) == 0);
- assert(ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE) == 0);
-
- if (generate_load() < 0) {
- error = 1;
goto err;
}
+ link = bpf_program__attach_perf_event(prog, pmu_fd);
+ if (libbpf_get_error(link)) {
+ printf("bpf_program__attach_perf_event failed\n");
+ link = NULL;
+ close(pmu_fd);
+ goto err;
+ }
+
+ if (generate_load() < 0)
+ goto err;
+
print_stacks();
+ error = 0;
err:
- ioctl(pmu_fd, PERF_EVENT_IOC_DISABLE);
- close(pmu_fd);
+ bpf_link__destroy(link);
if (error)
- int_exit(0);
+ err_exit(error);
}
static void test_bpf_perf_event(void)
@@ -280,29 +295,60 @@
int main(int argc, char **argv)
{
struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
+ struct bpf_object *obj = NULL;
char filename[256];
+ int error = 1;
snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
setrlimit(RLIMIT_MEMLOCK, &r);
- signal(SIGINT, int_exit);
- signal(SIGTERM, int_exit);
+ signal(SIGINT, err_exit);
+ signal(SIGTERM, err_exit);
if (load_kallsyms()) {
printf("failed to process /proc/kallsyms\n");
- return 1;
+ goto cleanup;
}
- if (load_bpf_file(filename)) {
- printf("%s", bpf_log_buf);
- return 2;
+ obj = bpf_object__open_file(filename, NULL);
+ if (libbpf_get_error(obj)) {
+ printf("opening BPF object file failed\n");
+ obj = NULL;
+ goto cleanup;
}
- if (fork() == 0) {
+ prog = bpf_object__find_program_by_name(obj, "bpf_prog1");
+ if (!prog) {
+ printf("finding a prog in obj file failed\n");
+ goto cleanup;
+ }
+
+ /* load BPF program */
+ if (bpf_object__load(obj)) {
+ printf("loading BPF object file failed\n");
+ goto cleanup;
+ }
+
+ map_fd[0] = bpf_object__find_map_fd_by_name(obj, "counts");
+ map_fd[1] = bpf_object__find_map_fd_by_name(obj, "stackmap");
+ if (map_fd[0] < 0 || map_fd[1] < 0) {
+ printf("finding a counts/stackmap map in obj file failed\n");
+ goto cleanup;
+ }
+
+ pid = fork();
+ if (pid == 0) {
read_trace_pipe();
return 0;
+ } else if (pid == -1) {
+ printf("couldn't spawn process\n");
+ goto cleanup;
}
+
test_bpf_perf_event();
- int_exit(0);
- return 0;
+ error = 0;
+
+cleanup:
+ bpf_object__close(obj);
+ err_exit(error);
}
--
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