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// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2023. Huawei Technologies Co., Ltd */
#include <vmlinux.h>
#include <bpf/bpf_tracing.h>
#include <bpf/bpf_helpers.h>
#include "bpf_experimental.h"
#include "bpf_misc.h"
#ifndef ARRAY_SIZE
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
#endif
struct generic_map_value {
void *data;
};
char _license[] SEC("license") = "GPL";
const unsigned int data_sizes[] = {16, 32, 64, 96, 128, 192, 256, 512, 1024, 2048, 4096};
const volatile unsigned int data_btf_ids[ARRAY_SIZE(data_sizes)] = {};
const unsigned int percpu_data_sizes[] = {8, 16, 32, 64, 96, 128, 192, 256, 512};
const volatile unsigned int percpu_data_btf_ids[ARRAY_SIZE(data_sizes)] = {};
int err = 0;
u32 pid = 0;
#define DEFINE_ARRAY_WITH_KPTR(_size) \
struct bin_data_##_size { \
char data[_size - sizeof(void *)]; \
}; \
/* See Commit 5d8d6634ccc, force btf generation for type bin_data_##_size */ \
struct bin_data_##_size *__bin_data_##_size; \
struct map_value_##_size { \
struct bin_data_##_size __kptr * data; \
}; \
struct { \
__uint(type, BPF_MAP_TYPE_ARRAY); \
__type(key, int); \
__type(value, struct map_value_##_size); \
__uint(max_entries, 128); \
} array_##_size SEC(".maps")
#define DEFINE_ARRAY_WITH_PERCPU_KPTR(_size) \
struct percpu_bin_data_##_size { \
char data[_size]; \
}; \
struct percpu_bin_data_##_size *__percpu_bin_data_##_size; \
struct map_value_percpu_##_size { \
struct percpu_bin_data_##_size __percpu_kptr * data; \
}; \
struct { \
__uint(type, BPF_MAP_TYPE_ARRAY); \
__type(key, int); \
__type(value, struct map_value_percpu_##_size); \
__uint(max_entries, 128); \
} array_percpu_##_size SEC(".maps")
static __always_inline void batch_alloc(struct bpf_map *map, unsigned int batch, unsigned int idx)
{
struct generic_map_value *value;
unsigned int i, key;
void *old, *new;
for (i = 0; i < batch; i++) {
key = i;
value = bpf_map_lookup_elem(map, &key);
if (!value) {
err = 1;
return;
}
new = bpf_obj_new_impl(data_btf_ids[idx], NULL);
if (!new) {
err = 2;
return;
}
old = bpf_kptr_xchg(&value->data, new);
if (old) {
bpf_obj_drop(old);
err = 3;
return;
}
}
}
static __always_inline void batch_free(struct bpf_map *map, unsigned int batch, unsigned int idx)
{
struct generic_map_value *value;
unsigned int i, key;
void *old;
for (i = 0; i < batch; i++) {
key = i;
value = bpf_map_lookup_elem(map, &key);
if (!value) {
err = 4;
return;
}
old = bpf_kptr_xchg(&value->data, NULL);
if (!old) {
err = 5;
return;
}
bpf_obj_drop(old);
}
}
static __always_inline void batch_percpu_alloc(struct bpf_map *map, unsigned int batch,
unsigned int idx)
{
struct generic_map_value *value;
unsigned int i, key;
void *old, *new;
for (i = 0; i < batch; i++) {
key = i;
value = bpf_map_lookup_elem(map, &key);
if (!value) {
err = 1;
return;
}
/* per-cpu allocator may not be able to refill in time */
new = bpf_percpu_obj_new_impl(percpu_data_btf_ids[idx], NULL);
if (!new)
continue;
old = bpf_kptr_xchg(&value->data, new);
if (old) {
bpf_percpu_obj_drop(old);
err = 2;
return;
}
}
}
static __always_inline void batch_percpu_free(struct bpf_map *map, unsigned int batch,
unsigned int idx)
{
struct generic_map_value *value;
unsigned int i, key;
void *old;
for (i = 0; i < batch; i++) {
key = i;
value = bpf_map_lookup_elem(map, &key);
if (!value) {
err = 3;
return;
}
old = bpf_kptr_xchg(&value->data, NULL);
if (!old)
continue;
bpf_percpu_obj_drop(old);
}
}
#define CALL_BATCH_ALLOC(size, batch, idx) \
batch_alloc((struct bpf_map *)(&array_##size), batch, idx)
#define CALL_BATCH_ALLOC_FREE(size, batch, idx) \
do { \
batch_alloc((struct bpf_map *)(&array_##size), batch, idx); \
batch_free((struct bpf_map *)(&array_##size), batch, idx); \
} while (0)
#define CALL_BATCH_PERCPU_ALLOC(size, batch, idx) \
batch_percpu_alloc((struct bpf_map *)(&array_percpu_##size), batch, idx)
#define CALL_BATCH_PERCPU_ALLOC_FREE(size, batch, idx) \
do { \
batch_percpu_alloc((struct bpf_map *)(&array_percpu_##size), batch, idx); \
batch_percpu_free((struct bpf_map *)(&array_percpu_##size), batch, idx); \
} while (0)
/* kptr doesn't support bin_data_8 which is a zero-sized array */
DEFINE_ARRAY_WITH_KPTR(16);
DEFINE_ARRAY_WITH_KPTR(32);
DEFINE_ARRAY_WITH_KPTR(64);
DEFINE_ARRAY_WITH_KPTR(96);
DEFINE_ARRAY_WITH_KPTR(128);
DEFINE_ARRAY_WITH_KPTR(192);
DEFINE_ARRAY_WITH_KPTR(256);
DEFINE_ARRAY_WITH_KPTR(512);
DEFINE_ARRAY_WITH_KPTR(1024);
DEFINE_ARRAY_WITH_KPTR(2048);
DEFINE_ARRAY_WITH_KPTR(4096);
DEFINE_ARRAY_WITH_PERCPU_KPTR(8);
DEFINE_ARRAY_WITH_PERCPU_KPTR(16);
DEFINE_ARRAY_WITH_PERCPU_KPTR(32);
DEFINE_ARRAY_WITH_PERCPU_KPTR(64);
DEFINE_ARRAY_WITH_PERCPU_KPTR(96);
DEFINE_ARRAY_WITH_PERCPU_KPTR(128);
DEFINE_ARRAY_WITH_PERCPU_KPTR(192);
DEFINE_ARRAY_WITH_PERCPU_KPTR(256);
DEFINE_ARRAY_WITH_PERCPU_KPTR(512);
SEC("?fentry/" SYS_PREFIX "sys_nanosleep")
int test_batch_alloc_free(void *ctx)
{
if ((u32)bpf_get_current_pid_tgid() != pid)
return 0;
/* Alloc 128 16-bytes objects in batch to trigger refilling,
* then free 128 16-bytes objects in batch to trigger freeing.
*/
CALL_BATCH_ALLOC_FREE(16, 128, 0);
CALL_BATCH_ALLOC_FREE(32, 128, 1);
CALL_BATCH_ALLOC_FREE(64, 128, 2);
CALL_BATCH_ALLOC_FREE(96, 128, 3);
CALL_BATCH_ALLOC_FREE(128, 128, 4);
CALL_BATCH_ALLOC_FREE(192, 128, 5);
CALL_BATCH_ALLOC_FREE(256, 128, 6);
CALL_BATCH_ALLOC_FREE(512, 64, 7);
CALL_BATCH_ALLOC_FREE(1024, 32, 8);
CALL_BATCH_ALLOC_FREE(2048, 16, 9);
CALL_BATCH_ALLOC_FREE(4096, 8, 10);
return 0;
}
SEC("?fentry/" SYS_PREFIX "sys_nanosleep")
int test_free_through_map_free(void *ctx)
{
if ((u32)bpf_get_current_pid_tgid() != pid)
return 0;
/* Alloc 128 16-bytes objects in batch to trigger refilling,
* then free these objects through map free.
*/
CALL_BATCH_ALLOC(16, 128, 0);
CALL_BATCH_ALLOC(32, 128, 1);
CALL_BATCH_ALLOC(64, 128, 2);
CALL_BATCH_ALLOC(96, 128, 3);
CALL_BATCH_ALLOC(128, 128, 4);
CALL_BATCH_ALLOC(192, 128, 5);
CALL_BATCH_ALLOC(256, 128, 6);
CALL_BATCH_ALLOC(512, 64, 7);
CALL_BATCH_ALLOC(1024, 32, 8);
CALL_BATCH_ALLOC(2048, 16, 9);
CALL_BATCH_ALLOC(4096, 8, 10);
return 0;
}
SEC("?fentry/" SYS_PREFIX "sys_nanosleep")
int test_batch_percpu_alloc_free(void *ctx)
{
if ((u32)bpf_get_current_pid_tgid() != pid)
return 0;
/* Alloc 128 8-bytes per-cpu objects in batch to trigger refilling,
* then free 128 8-bytes per-cpu objects in batch to trigger freeing.
*/
CALL_BATCH_PERCPU_ALLOC_FREE(8, 128, 0);
CALL_BATCH_PERCPU_ALLOC_FREE(16, 128, 1);
CALL_BATCH_PERCPU_ALLOC_FREE(32, 128, 2);
CALL_BATCH_PERCPU_ALLOC_FREE(64, 128, 3);
CALL_BATCH_PERCPU_ALLOC_FREE(96, 128, 4);
CALL_BATCH_PERCPU_ALLOC_FREE(128, 128, 5);
CALL_BATCH_PERCPU_ALLOC_FREE(192, 128, 6);
CALL_BATCH_PERCPU_ALLOC_FREE(256, 128, 7);
CALL_BATCH_PERCPU_ALLOC_FREE(512, 64, 8);
return 0;
}
SEC("?fentry/" SYS_PREFIX "sys_nanosleep")
int test_percpu_free_through_map_free(void *ctx)
{
if ((u32)bpf_get_current_pid_tgid() != pid)
return 0;
/* Alloc 128 8-bytes per-cpu objects in batch to trigger refilling,
* then free these object through map free.
*/
CALL_BATCH_PERCPU_ALLOC(8, 128, 0);
CALL_BATCH_PERCPU_ALLOC(16, 128, 1);
CALL_BATCH_PERCPU_ALLOC(32, 128, 2);
CALL_BATCH_PERCPU_ALLOC(64, 128, 3);
CALL_BATCH_PERCPU_ALLOC(96, 128, 4);
CALL_BATCH_PERCPU_ALLOC(128, 128, 5);
CALL_BATCH_PERCPU_ALLOC(192, 128, 6);
CALL_BATCH_PERCPU_ALLOC(256, 128, 7);
CALL_BATCH_PERCPU_ALLOC(512, 64, 8);
return 0;
}
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