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samples/bpf: Remove sample tracex2
In commitba8de796ba("net: introduce sk_skb_reason_drop function") kfree_skb_reason() becomes an inline function and cannot be traced. samples/bpf is abandonware by now, and we should slowly but surely convert whatever makes sense into BPF selftests under tools/testing/selftests/bpf and just get rid of the rest. Link:ba8de796baSigned-off-by: Rong Tao <rongtao@cestc.cn> Link: https://lore.kernel.org/r/tencent_30ADAC88CB2915CA57E9512D4460035BA107@qq.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Rong Tao
Alexei Starovoitov
parent
02baa0a2a6
commit
46f4ea04e0
@ -13,7 +13,6 @@ tprogs-y += sockex1
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tprogs-y += sockex2
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tprogs-y += sockex3
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tprogs-y += tracex1
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tprogs-y += tracex2
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tprogs-y += tracex3
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tprogs-y += tracex4
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tprogs-y += tracex5
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@ -63,7 +62,6 @@ sockex1-objs := sockex1_user.o
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sockex2-objs := sockex2_user.o
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sockex3-objs := sockex3_user.o
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tracex1-objs := tracex1_user.o $(TRACE_HELPERS)
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tracex2-objs := tracex2_user.o
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tracex3-objs := tracex3_user.o
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tracex4-objs := tracex4_user.o
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tracex5-objs := tracex5_user.o $(TRACE_HELPERS)
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@ -105,7 +103,6 @@ always-y += sockex1_kern.o
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always-y += sockex2_kern.o
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always-y += sockex3_kern.o
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always-y += tracex1.bpf.o
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always-y += tracex2.bpf.o
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always-y += tracex3.bpf.o
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always-y += tracex4.bpf.o
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always-y += tracex5.bpf.o
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@ -1,99 +0,0 @@
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/* Copyright (c) 2013-2015 PLUMgrid, http://plumgrid.com
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*/
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#include "vmlinux.h"
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#include <linux/version.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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#include <bpf/bpf_core_read.h>
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struct {
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__uint(type, BPF_MAP_TYPE_HASH);
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__type(key, long);
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__type(value, long);
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__uint(max_entries, 1024);
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} my_map SEC(".maps");
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/* kprobe is NOT a stable ABI. If kernel internals change this bpf+kprobe
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* example will no longer be meaningful
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*/
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SEC("kprobe/kfree_skb_reason")
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int bpf_prog2(struct pt_regs *ctx)
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{
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long loc = 0;
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long init_val = 1;
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long *value;
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/* read ip of kfree_skb_reason caller.
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* non-portable version of __builtin_return_address(0)
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*/
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BPF_KPROBE_READ_RET_IP(loc, ctx);
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value = bpf_map_lookup_elem(&my_map, &loc);
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if (value)
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*value += 1;
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else
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bpf_map_update_elem(&my_map, &loc, &init_val, BPF_ANY);
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return 0;
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}
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static unsigned int log2(unsigned int v)
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{
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unsigned int r;
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unsigned int shift;
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r = (v > 0xFFFF) << 4; v >>= r;
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shift = (v > 0xFF) << 3; v >>= shift; r |= shift;
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shift = (v > 0xF) << 2; v >>= shift; r |= shift;
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shift = (v > 0x3) << 1; v >>= shift; r |= shift;
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r |= (v >> 1);
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return r;
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}
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static unsigned int log2l(unsigned long v)
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{
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unsigned int hi = v >> 32;
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if (hi)
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return log2(hi) + 32;
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else
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return log2(v);
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}
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struct hist_key {
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char comm[16];
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u64 pid_tgid;
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u64 uid_gid;
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u64 index;
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};
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struct {
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__uint(type, BPF_MAP_TYPE_PERCPU_HASH);
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__uint(key_size, sizeof(struct hist_key));
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__uint(value_size, sizeof(long));
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__uint(max_entries, 1024);
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} my_hist_map SEC(".maps");
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SEC("ksyscall/write")
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int BPF_KSYSCALL(bpf_prog3, unsigned int fd, const char *buf, size_t count)
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{
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long init_val = 1;
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long *value;
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struct hist_key key;
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key.index = log2l(count);
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key.pid_tgid = bpf_get_current_pid_tgid();
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key.uid_gid = bpf_get_current_uid_gid();
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bpf_get_current_comm(&key.comm, sizeof(key.comm));
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value = bpf_map_lookup_elem(&my_hist_map, &key);
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if (value)
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__sync_fetch_and_add(value, 1);
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else
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bpf_map_update_elem(&my_hist_map, &key, &init_val, BPF_ANY);
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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u32 _version SEC("version") = LINUX_VERSION_CODE;
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@ -1,187 +0,0 @@
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// SPDX-License-Identifier: GPL-2.0
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <string.h>
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#include <bpf/bpf.h>
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#include <bpf/libbpf.h>
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#include "bpf_util.h"
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#define MAX_INDEX 64
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#define MAX_STARS 38
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/* my_map, my_hist_map */
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static int map_fd[2];
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static void stars(char *str, long val, long max, int width)
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{
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int i;
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for (i = 0; i < (width * val / max) - 1 && i < width - 1; i++)
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str[i] = '*';
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if (val > max)
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str[i - 1] = '+';
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str[i] = '\0';
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}
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struct task {
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char comm[16];
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__u64 pid_tgid;
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__u64 uid_gid;
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};
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struct hist_key {
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struct task t;
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__u32 index;
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};
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#define SIZE sizeof(struct task)
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static void print_hist_for_pid(int fd, void *task)
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{
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unsigned int nr_cpus = bpf_num_possible_cpus();
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struct hist_key key = {}, next_key;
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long values[nr_cpus];
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char starstr[MAX_STARS];
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long value;
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long data[MAX_INDEX] = {};
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int max_ind = -1;
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long max_value = 0;
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int i, ind;
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while (bpf_map_get_next_key(fd, &key, &next_key) == 0) {
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if (memcmp(&next_key, task, SIZE)) {
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key = next_key;
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continue;
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}
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bpf_map_lookup_elem(fd, &next_key, values);
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value = 0;
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for (i = 0; i < nr_cpus; i++)
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value += values[i];
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ind = next_key.index;
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data[ind] = value;
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if (value && ind > max_ind)
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max_ind = ind;
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if (value > max_value)
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max_value = value;
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key = next_key;
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}
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printf(" syscall write() stats\n");
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printf(" byte_size : count distribution\n");
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for (i = 1; i <= max_ind + 1; i++) {
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stars(starstr, data[i - 1], max_value, MAX_STARS);
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printf("%8ld -> %-8ld : %-8ld |%-*s|\n",
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(1l << i) >> 1, (1l << i) - 1, data[i - 1],
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MAX_STARS, starstr);
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}
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}
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static void print_hist(int fd)
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{
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struct hist_key key = {}, next_key;
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static struct task tasks[1024];
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int task_cnt = 0;
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int i;
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while (bpf_map_get_next_key(fd, &key, &next_key) == 0) {
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int found = 0;
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for (i = 0; i < task_cnt; i++)
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if (memcmp(&tasks[i], &next_key, SIZE) == 0)
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found = 1;
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if (!found)
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memcpy(&tasks[task_cnt++], &next_key, SIZE);
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key = next_key;
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}
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for (i = 0; i < task_cnt; i++) {
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printf("\npid %d cmd %s uid %d\n",
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(__u32) tasks[i].pid_tgid,
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tasks[i].comm,
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(__u32) tasks[i].uid_gid);
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print_hist_for_pid(fd, &tasks[i]);
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}
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}
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static void int_exit(int sig)
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{
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print_hist(map_fd[1]);
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exit(0);
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}
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int main(int ac, char **argv)
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{
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long key, next_key, value;
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struct bpf_link *links[2];
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struct bpf_program *prog;
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struct bpf_object *obj;
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char filename[256];
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int i, j = 0;
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FILE *f;
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snprintf(filename, sizeof(filename), "%s.bpf.o", argv[0]);
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obj = bpf_object__open_file(filename, NULL);
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if (libbpf_get_error(obj)) {
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fprintf(stderr, "ERROR: opening BPF object file failed\n");
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return 0;
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}
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/* load BPF program */
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if (bpf_object__load(obj)) {
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fprintf(stderr, "ERROR: loading BPF object file failed\n");
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goto cleanup;
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}
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map_fd[0] = bpf_object__find_map_fd_by_name(obj, "my_map");
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map_fd[1] = bpf_object__find_map_fd_by_name(obj, "my_hist_map");
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if (map_fd[0] < 0 || map_fd[1] < 0) {
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fprintf(stderr, "ERROR: finding a map in obj file failed\n");
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goto cleanup;
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}
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signal(SIGINT, int_exit);
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signal(SIGTERM, int_exit);
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/* start 'ping' in the background to have some kfree_skb_reason
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* events */
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f = popen("ping -4 -c5 localhost", "r");
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(void) f;
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/* start 'dd' in the background to have plenty of 'write' syscalls */
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f = popen("dd if=/dev/zero of=/dev/null count=5000000", "r");
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(void) f;
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bpf_object__for_each_program(prog, obj) {
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links[j] = bpf_program__attach(prog);
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if (libbpf_get_error(links[j])) {
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fprintf(stderr, "ERROR: bpf_program__attach failed\n");
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links[j] = NULL;
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goto cleanup;
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}
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j++;
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}
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for (i = 0; i < 5; i++) {
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key = 0;
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while (bpf_map_get_next_key(map_fd[0], &key, &next_key) == 0) {
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bpf_map_lookup_elem(map_fd[0], &next_key, &value);
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printf("location 0x%lx count %ld\n", next_key, value);
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key = next_key;
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}
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if (key)
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printf("\n");
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sleep(1);
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}
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print_hist(map_fd[1]);
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cleanup:
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for (j--; j >= 0; j--)
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bpf_link__destroy(links[j]);
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bpf_object__close(obj);
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return 0;
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}
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