1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2026 Meta Platforms, Inc. and affiliates. */
3
4 #include <argp.h>
5 #include "bench.h"
6 #include "bpf_for_bench.skel.h"
7
8 /* BPF triggering benchmarks */
9 static struct ctx {
10 struct bpf_for_bench *skel;
11 } ctx;
12
13 static struct {
14 __u32 nr_loops;
15 } args = {
16 /*
17 * Default to a large loop count so the per-iteration bpf_iter_num_next() cost dominates
18 * the one-time bpf_iter_num_new()/destroy() setup and teardown.
19 */
20 .nr_loops = 1000,
21 };
22
23 enum {
24 ARG_NR_LOOPS = 4000,
25 };
26
27 static const struct argp_option opts[] = {
28 { "nr_loops", ARG_NR_LOOPS, "nr_loops", 0,
29 "Set number of iterations for the bpf_for() loop"},
30 {},
31 };
32
parse_arg(int key,char * arg,struct argp_state * state)33 static error_t parse_arg(int key, char *arg, struct argp_state *state)
34 {
35 switch (key) {
36 case ARG_NR_LOOPS:
37 args.nr_loops = strtol(arg, NULL, 10);
38 break;
39 default:
40 return ARGP_ERR_UNKNOWN;
41 }
42
43 return 0;
44 }
45
46 /* exported into benchmark runner */
47 const struct argp bench_bpf_for_argp = {
48 .options = opts,
49 .parser = parse_arg,
50 };
51
validate(void)52 static void validate(void)
53 {
54 if (env.consumer_cnt != 0) {
55 fprintf(stderr, "benchmark doesn't support consumer!\n");
56 exit(1);
57 }
58 }
59
producer(void * input)60 static void *producer(void *input)
61 {
62 while (true)
63 /* trigger the bpf program */
64 syscall(__NR_getpgid);
65
66 return NULL;
67 }
68
measure(struct bench_res * res)69 static void measure(struct bench_res *res)
70 {
71 res->hits = atomic_swap(&ctx.skel->bss->hits, 0);
72 }
73
setup(void)74 static void setup(void)
75 {
76 struct bpf_link *link;
77
78 setup_libbpf();
79
80 ctx.skel = bpf_for_bench__open_and_load();
81 if (!ctx.skel) {
82 fprintf(stderr, "failed to open skeleton\n");
83 exit(1);
84 }
85
86 link = bpf_program__attach(ctx.skel->progs.benchmark);
87 if (!link) {
88 fprintf(stderr, "failed to attach program!\n");
89 exit(1);
90 }
91
92 ctx.skel->bss->nr_loops = args.nr_loops;
93 }
94
95 const struct bench bench_bpf_for = {
96 .name = "bpf-for",
97 .argp = &bench_bpf_for_argp,
98 .validate = validate,
99 .setup = setup,
100 .producer_thread = producer,
101 .measure = measure,
102 .report_progress = ops_report_progress,
103 .report_final = ops_report_final,
104 };
105