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// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2025. Huawei Technologies Co., Ltd */
#define _GNU_SOURCE
#include <stdbool.h>
#include <test_progs.h>
#include "fd_htab_lookup.skel.h"
struct htab_op_ctx {
int fd;
int loop;
unsigned int entries;
bool stop;
};
#define ERR_TO_RETVAL(where, err) ((void *)(long)(((where) << 12) | (-err)))
static void *htab_lookup_fn(void *arg)
{
struct htab_op_ctx *ctx = arg;
int i = 0;
while (i++ < ctx->loop && !ctx->stop) {
unsigned int j;
for (j = 0; j < ctx->entries; j++) {
unsigned int key = j, zero = 0, value;
int inner_fd, err;
err = bpf_map_lookup_elem(ctx->fd, &key, &value);
if (err) {
ctx->stop = true;
return ERR_TO_RETVAL(1, err);
}
inner_fd = bpf_map_get_fd_by_id(value);
if (inner_fd < 0) {
/* The old map has been freed */
if (inner_fd == -ENOENT)
continue;
ctx->stop = true;
return ERR_TO_RETVAL(2, inner_fd);
}
err = bpf_map_lookup_elem(inner_fd, &zero, &value);
if (err) {
close(inner_fd);
ctx->stop = true;
return ERR_TO_RETVAL(3, err);
}
close(inner_fd);
if (value != key) {
ctx->stop = true;
return ERR_TO_RETVAL(4, -EINVAL);
}
}
}
return NULL;
}
static void *htab_update_fn(void *arg)
{
struct htab_op_ctx *ctx = arg;
int i = 0;
while (i++ < ctx->loop && !ctx->stop) {
unsigned int j;
for (j = 0; j < ctx->entries; j++) {
unsigned int key = j, zero = 0;
int inner_fd, err;
inner_fd = bpf_map_create(BPF_MAP_TYPE_ARRAY, NULL, 4, 4, 1, NULL);
if (inner_fd < 0) {
ctx->stop = true;
return ERR_TO_RETVAL(1, inner_fd);
}
err = bpf_map_update_elem(inner_fd, &zero, &key, 0);
if (err) {
close(inner_fd);
ctx->stop = true;
return ERR_TO_RETVAL(2, err);
}
err = bpf_map_update_elem(ctx->fd, &key, &inner_fd, BPF_EXIST);
if (err) {
close(inner_fd);
ctx->stop = true;
return ERR_TO_RETVAL(3, err);
}
close(inner_fd);
}
}
return NULL;
}
static int setup_htab(int fd, unsigned int entries)
{
unsigned int i;
for (i = 0; i < entries; i++) {
unsigned int key = i, zero = 0;
int inner_fd, err;
inner_fd = bpf_map_create(BPF_MAP_TYPE_ARRAY, NULL, 4, 4, 1, NULL);
if (!ASSERT_OK_FD(inner_fd, "new array"))
return -1;
err = bpf_map_update_elem(inner_fd, &zero, &key, 0);
if (!ASSERT_OK(err, "init array")) {
close(inner_fd);
return -1;
}
err = bpf_map_update_elem(fd, &key, &inner_fd, 0);
if (!ASSERT_OK(err, "init outer")) {
close(inner_fd);
return -1;
}
close(inner_fd);
}
return 0;
}
static int get_int_from_env(const char *name, int dft)
{
const char *value;
value = getenv(name);
if (!value)
return dft;
return atoi(value);
}
void test_fd_htab_lookup(void)
{
unsigned int i, wr_nr = 8, rd_nr = 16;
pthread_t tids[wr_nr + rd_nr];
struct fd_htab_lookup *skel;
struct htab_op_ctx ctx;
int err;
skel = fd_htab_lookup__open_and_load();
if (!ASSERT_OK_PTR(skel, "fd_htab_lookup__open_and_load"))
return;
ctx.fd = bpf_map__fd(skel->maps.outer_map);
ctx.loop = get_int_from_env("FD_HTAB_LOOP_NR", 5);
ctx.stop = false;
ctx.entries = 8;
err = setup_htab(ctx.fd, ctx.entries);
if (err)
goto destroy;
memset(tids, 0, sizeof(tids));
for (i = 0; i < wr_nr; i++) {
err = pthread_create(&tids[i], NULL, htab_update_fn, &ctx);
if (!ASSERT_OK(err, "pthread_create")) {
ctx.stop = true;
goto reap;
}
}
for (i = 0; i < rd_nr; i++) {
err = pthread_create(&tids[i + wr_nr], NULL, htab_lookup_fn, &ctx);
if (!ASSERT_OK(err, "pthread_create")) {
ctx.stop = true;
goto reap;
}
}
reap:
for (i = 0; i < wr_nr + rd_nr; i++) {
void *ret = NULL;
char desc[32];
if (!tids[i])
continue;
snprintf(desc, sizeof(desc), "thread %u", i + 1);
err = pthread_join(tids[i], &ret);
ASSERT_OK(err, desc);
ASSERT_EQ(ret, NULL, desc);
}
destroy:
fd_htab_lookup__destroy(skel);
}
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