1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (c) 2021 Facebook */
3
4#include <argp.h>
5#include "bench.h"
6#include "bpf_loop_bench.skel.h"
7
8/* BPF triggering benchmarks */
9static struct ctx {
10 struct bpf_loop_bench *skel;
11} ctx;
12
13static struct {
14 __u32 nr_loops;
15} args = {
16 .nr_loops = 10,
17};
18
19enum {
20 ARG_NR_LOOPS = 4000,
21};
22
23static const struct argp_option opts[] = {
24 { "nr_loops", ARG_NR_LOOPS, "nr_loops", 0,
25 "Set number of loops for the bpf_loop helper"},
26 {},
27};
28
29static error_t parse_arg(int key, char *arg, struct argp_state *state)
30{
31 switch (key) {
32 case ARG_NR_LOOPS:
33 args.nr_loops = strtol(arg, NULL, 10);
34 break;
35 default:
36 return ARGP_ERR_UNKNOWN;
37 }
38
39 return 0;
40}
41
42/* exported into benchmark runner */
43const struct argp bench_bpf_loop_argp = {
44 .options = opts,
45 .parser = parse_arg,
46};
47
48static void validate(void)
49{
50 if (env.consumer_cnt != 0) {
51 fprintf(stderr, "benchmark doesn't support consumer!\n");
52 exit(1);
53 }
54}
55
56static void *producer(void *input)
57{
58 while (true)
59 /* trigger the bpf program */
60 syscall(__NR_getpgid);
61
62 return NULL;
63}
64
65static void measure(struct bench_res *res)
66{
67 res->hits = atomic_swap(&ctx.skel->bss->hits, 0);
68}
69
70static void setup(void)
71{
72 struct bpf_link *link;
73
74 setup_libbpf();
75
76 ctx.skel = bpf_loop_bench__open_and_load();
77 if (!ctx.skel) {
78 fprintf(stderr, "failed to open skeleton\n");
79 exit(1);
80 }
81
82 link = bpf_program__attach(ctx.skel->progs.benchmark);
83 if (!link) {
84 fprintf(stderr, "failed to attach program!\n");
85 exit(1);
86 }
87
88 ctx.skel->bss->nr_loops = args.nr_loops;
89}
90
91const struct bench bench_bpf_loop = {
92 .name = "bpf-loop",
93 .argp = &bench_bpf_loop_argp,
94 .validate = validate,
95 .setup = setup,
96 .producer_thread = producer,
97 .measure = measure,
98 .report_progress = ops_report_progress,
99 .report_final = ops_report_final,
100};
101

source code of linux/tools/testing/selftests/bpf/benchs/bench_bpf_loop.c