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// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2021. Huawei Technologies Co., Ltd */
#include <argp.h>
#include "bench.h"
#include "strncmp_bench.skel.h"
static struct strncmp_ctx {
struct strncmp_bench *skel;
} ctx;
static struct strncmp_args {
u32 cmp_str_len;
} args = {
.cmp_str_len = 32,
};
enum {
ARG_CMP_STR_LEN = 5000,
};
static const struct argp_option opts[] = {
{ "cmp-str-len", ARG_CMP_STR_LEN, "CMP_STR_LEN", 0,
"Set the length of compared string" },
{},
};
static error_t strncmp_parse_arg(int key, char *arg, struct argp_state *state)
{
switch (key) {
case ARG_CMP_STR_LEN:
args.cmp_str_len = strtoul(arg, NULL, 10);
if (!args.cmp_str_len ||
args.cmp_str_len >= sizeof(ctx.skel->bss->str)) {
fprintf(stderr, "Invalid cmp str len (limit %zu)\n",
sizeof(ctx.skel->bss->str));
argp_usage(state);
}
break;
default:
return ARGP_ERR_UNKNOWN;
}
return 0;
}
const struct argp bench_strncmp_argp = {
.options = opts,
.parser = strncmp_parse_arg,
};
static void strncmp_validate(void)
{
if (env.consumer_cnt != 0) {
fprintf(stderr, "strncmp benchmark doesn't support consumer!\n");
exit(1);
}
}
static void strncmp_setup(void)
{
int err;
char *target;
size_t i, sz;
sz = sizeof(ctx.skel->rodata->target);
if (!sz || sz < sizeof(ctx.skel->bss->str)) {
fprintf(stderr, "invalid string size (target %zu, src %zu)\n",
sz, sizeof(ctx.skel->bss->str));
exit(1);
}
setup_libbpf();
ctx.skel = strncmp_bench__open();
if (!ctx.skel) {
fprintf(stderr, "failed to open skeleton\n");
exit(1);
}
srandom(time(NULL));
target = ctx.skel->rodata->target;
for (i = 0; i < sz - 1; i++)
target[i] = '1' + random() % 9;
target[sz - 1] = '\0';
ctx.skel->rodata->cmp_str_len = args.cmp_str_len;
memcpy(ctx.skel->bss->str, target, args.cmp_str_len);
ctx.skel->bss->str[args.cmp_str_len] = '\0';
/* Make bss->str < rodata->target */
ctx.skel->bss->str[args.cmp_str_len - 1] -= 1;
err = strncmp_bench__load(ctx.skel);
if (err) {
fprintf(stderr, "failed to load skeleton\n");
strncmp_bench__destroy(ctx.skel);
exit(1);
}
}
static void strncmp_attach_prog(struct bpf_program *prog)
{
struct bpf_link *link;
link = bpf_program__attach(prog);
if (!link) {
fprintf(stderr, "failed to attach program!\n");
exit(1);
}
}
static void strncmp_no_helper_setup(void)
{
strncmp_setup();
strncmp_attach_prog(ctx.skel->progs.strncmp_no_helper);
}
static void strncmp_helper_setup(void)
{
strncmp_setup();
strncmp_attach_prog(ctx.skel->progs.strncmp_helper);
}
static void *strncmp_producer(void *ctx)
{
while (true)
(void)syscall(__NR_getpgid);
return NULL;
}
static void strncmp_measure(struct bench_res *res)
{
res->hits = atomic_swap(&ctx.skel->bss->hits, 0);
}
const struct bench bench_strncmp_no_helper = {
.name = "strncmp-no-helper",
.argp = &bench_strncmp_argp,
.validate = strncmp_validate,
.setup = strncmp_no_helper_setup,
.producer_thread = strncmp_producer,
.measure = strncmp_measure,
.report_progress = hits_drops_report_progress,
.report_final = hits_drops_report_final,
};
const struct bench bench_strncmp_helper = {
.name = "strncmp-helper",
.argp = &bench_strncmp_argp,
.validate = strncmp_validate,
.setup = strncmp_helper_setup,
.producer_thread = strncmp_producer,
.measure = strncmp_measure,
.report_progress = hits_drops_report_progress,
.report_final = hits_drops_report_final,
};
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