extern struct argp bench_ringbufs_argp;
extern struct argp bench_bloom_map_argp;
extern struct argp bench_bpf_loop_argp;
+extern struct argp bench_strncmp_argp;
static const struct argp_child bench_parsers[] = {
{ &bench_ringbufs_argp, 0, "Ring buffers benchmark", 0 },
{ &bench_bloom_map_argp, 0, "Bloom filter map benchmark", 0 },
{ &bench_bpf_loop_argp, 0, "bpf_loop helper benchmark", 0 },
+ { &bench_strncmp_argp, 0, "bpf_strncmp helper benchmark", 0 },
{},
};
extern const struct bench bench_hashmap_without_bloom;
extern const struct bench bench_hashmap_with_bloom;
extern const struct bench bench_bpf_loop;
+extern const struct bench bench_strncmp_no_helper;
+extern const struct bench bench_strncmp_helper;
static const struct bench *benchs[] = {
&bench_count_global,
&bench_hashmap_without_bloom,
&bench_hashmap_with_bloom,
&bench_bpf_loop,
+ &bench_strncmp_no_helper,
+ &bench_strncmp_helper,
};
static void setup_benchmark()
--- /dev/null
+// 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 != 1) {
+ fprintf(stderr, "strncmp benchmark doesn't support multi-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_consumer(void *ctx)
+{
+ 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",
+ .validate = strncmp_validate,
+ .setup = strncmp_no_helper_setup,
+ .producer_thread = strncmp_producer,
+ .consumer_thread = strncmp_consumer,
+ .measure = strncmp_measure,
+ .report_progress = hits_drops_report_progress,
+ .report_final = hits_drops_report_final,
+};
+
+const struct bench bench_strncmp_helper = {
+ .name = "strncmp-helper",
+ .validate = strncmp_validate,
+ .setup = strncmp_helper_setup,
+ .producer_thread = strncmp_producer,
+ .consumer_thread = strncmp_consumer,
+ .measure = strncmp_measure,
+ .report_progress = hits_drops_report_progress,
+ .report_final = hits_drops_report_final,
+};
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2021. Huawei Technologies Co., Ltd */
+#include <linux/types.h>
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+
+#define STRNCMP_STR_SZ 4096
+
+/* Will be updated by benchmark before program loading */
+const volatile unsigned int cmp_str_len = 1;
+const char target[STRNCMP_STR_SZ];
+
+long hits = 0;
+char str[STRNCMP_STR_SZ];
+
+char _license[] SEC("license") = "GPL";
+
+static __always_inline int local_strncmp(const char *s1, unsigned int sz,
+ const char *s2)
+{
+ int ret = 0;
+ unsigned int i;
+
+ for (i = 0; i < sz; i++) {
+ /* E.g. 0xff > 0x31 */
+ ret = (unsigned char)s1[i] - (unsigned char)s2[i];
+ if (ret || !s1[i])
+ break;
+ }
+
+ return ret;
+}
+
+SEC("tp/syscalls/sys_enter_getpgid")
+int strncmp_no_helper(void *ctx)
+{
+ if (local_strncmp(str, cmp_str_len + 1, target) < 0)
+ __sync_add_and_fetch(&hits, 1);
+ return 0;
+}
+
+SEC("tp/syscalls/sys_enter_getpgid")
+int strncmp_helper(void *ctx)
+{
+ if (bpf_strncmp(str, cmp_str_len + 1, target) < 0)
+ __sync_add_and_fetch(&hits, 1);
+ return 0;
+}
+
projects / platform / kernel / linux-rpi.git / commitdiff