1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2020 Facebook */
3 #include <fcntl.h>
4 #include "bench.h"
5 #include "test_overhead.skel.h"
6 
7 /* BPF triggering benchmarks */
8 static struct ctx {
9 	struct test_overhead *skel;
10 	struct counter hits;
11 	int fd;
12 } ctx;
13 
14 static void validate()
15 {
16 	if (env.producer_cnt != 1) {
17 		fprintf(stderr, "benchmark doesn't support multi-producer!\n");
18 		exit(1);
19 	}
20 	if (env.consumer_cnt != 1) {
21 		fprintf(stderr, "benchmark doesn't support multi-consumer!\n");
22 		exit(1);
23 	}
24 }
25 
26 static void *producer(void *input)
27 {
28 	char buf[] = "test_overhead";
29 	int err;
30 
31 	while (true) {
32 		err = write(ctx.fd, buf, sizeof(buf));
33 		if (err < 0) {
34 			fprintf(stderr, "write failed\n");
35 			exit(1);
36 		}
37 		atomic_inc(&ctx.hits.value);
38 	}
39 }
40 
41 static void measure(struct bench_res *res)
42 {
43 	res->hits = atomic_swap(&ctx.hits.value, 0);
44 }
45 
46 static void setup_ctx()
47 {
48 	setup_libbpf();
49 
50 	ctx.skel = test_overhead__open_and_load();
51 	if (!ctx.skel) {
52 		fprintf(stderr, "failed to open skeleton\n");
53 		exit(1);
54 	}
55 
56 	ctx.fd = open("/proc/self/comm", O_WRONLY|O_TRUNC);
57 	if (ctx.fd < 0) {
58 		fprintf(stderr, "failed to open /proc/self/comm: %d\n", -errno);
59 		exit(1);
60 	}
61 }
62 
63 static void attach_bpf(struct bpf_program *prog)
64 {
65 	struct bpf_link *link;
66 
67 	link = bpf_program__attach(prog);
68 	if (IS_ERR(link)) {
69 		fprintf(stderr, "failed to attach program!\n");
70 		exit(1);
71 	}
72 }
73 
74 static void setup_base()
75 {
76 	setup_ctx();
77 }
78 
79 static void setup_kprobe()
80 {
81 	setup_ctx();
82 	attach_bpf(ctx.skel->progs.prog1);
83 }
84 
85 static void setup_kretprobe()
86 {
87 	setup_ctx();
88 	attach_bpf(ctx.skel->progs.prog2);
89 }
90 
91 static void setup_rawtp()
92 {
93 	setup_ctx();
94 	attach_bpf(ctx.skel->progs.prog3);
95 }
96 
97 static void setup_fentry()
98 {
99 	setup_ctx();
100 	attach_bpf(ctx.skel->progs.prog4);
101 }
102 
103 static void setup_fexit()
104 {
105 	setup_ctx();
106 	attach_bpf(ctx.skel->progs.prog5);
107 }
108 
109 static void *consumer(void *input)
110 {
111 	return NULL;
112 }
113 
114 const struct bench bench_rename_base = {
115 	.name = "rename-base",
116 	.validate = validate,
117 	.setup = setup_base,
118 	.producer_thread = producer,
119 	.consumer_thread = consumer,
120 	.measure = measure,
121 	.report_progress = hits_drops_report_progress,
122 	.report_final = hits_drops_report_final,
123 };
124 
125 const struct bench bench_rename_kprobe = {
126 	.name = "rename-kprobe",
127 	.validate = validate,
128 	.setup = setup_kprobe,
129 	.producer_thread = producer,
130 	.consumer_thread = consumer,
131 	.measure = measure,
132 	.report_progress = hits_drops_report_progress,
133 	.report_final = hits_drops_report_final,
134 };
135 
136 const struct bench bench_rename_kretprobe = {
137 	.name = "rename-kretprobe",
138 	.validate = validate,
139 	.setup = setup_kretprobe,
140 	.producer_thread = producer,
141 	.consumer_thread = consumer,
142 	.measure = measure,
143 	.report_progress = hits_drops_report_progress,
144 	.report_final = hits_drops_report_final,
145 };
146 
147 const struct bench bench_rename_rawtp = {
148 	.name = "rename-rawtp",
149 	.validate = validate,
150 	.setup = setup_rawtp,
151 	.producer_thread = producer,
152 	.consumer_thread = consumer,
153 	.measure = measure,
154 	.report_progress = hits_drops_report_progress,
155 	.report_final = hits_drops_report_final,
156 };
157 
158 const struct bench bench_rename_fentry = {
159 	.name = "rename-fentry",
160 	.validate = validate,
161 	.setup = setup_fentry,
162 	.producer_thread = producer,
163 	.consumer_thread = consumer,
164 	.measure = measure,
165 	.report_progress = hits_drops_report_progress,
166 	.report_final = hits_drops_report_final,
167 };
168 
169 const struct bench bench_rename_fexit = {
170 	.name = "rename-fexit",
171 	.validate = validate,
172 	.setup = setup_fexit,
173 	.producer_thread = producer,
174 	.consumer_thread = consumer,
175 	.measure = measure,
176 	.report_progress = hits_drops_report_progress,
177 	.report_final = hits_drops_report_final,
178 };
179