tools/testing/selftests/bpf/progs/test_bpf_ma.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (C) 2023. Huawei Technologies Co., Ltd */
   3 #include <vmlinux.h>
   4 #include <bpf/bpf_tracing.h>
   5 #include <bpf/bpf_helpers.h>
   6
   7 #include "bpf_experimental.h"
   8 #include "bpf_misc.h"
   9
  10 struct generic_map_value {
  11         void *data;
  12 };
  13
  14 char _license[] SEC("license") = "GPL";
  15
  16 const unsigned int data_sizes[] = {16, 32, 64, 96, 128, 192, 256, 512, 1024, 2048, 4096};
  17 const volatile unsigned int data_btf_ids[ARRAY_SIZE(data_sizes)] = {};
  18
  19 const unsigned int percpu_data_sizes[] = {8, 16, 32, 64, 96, 128, 192, 256, 512};
  20 const volatile unsigned int percpu_data_btf_ids[ARRAY_SIZE(data_sizes)] = {};
  21
  22 int err = 0;
  23 u32 pid = 0;
  24
  25 #define DEFINE_ARRAY_WITH_KPTR(_size) \
  26         struct bin_data_##_size { \
  27                 char data[_size - sizeof(void *)]; \
  28         }; \
  29         /* See Commit 5d8d6634ccc, force btf generation for type bin_data_##_size */    \
  30         struct bin_data_##_size *__bin_data_##_size; \
  31         struct map_value_##_size { \
  32                 struct bin_data_##_size __kptr * data; \
  33         }; \
  34         struct { \
  35                 __uint(type, BPF_MAP_TYPE_ARRAY); \
  36                 __type(key, int); \
  37                 __type(value, struct map_value_##_size); \
  38                 __uint(max_entries, 128); \
  39         } array_##_size SEC(".maps")
  40
  41 #define DEFINE_ARRAY_WITH_PERCPU_KPTR(_size) \
  42         struct percpu_bin_data_##_size { \
  43                 char data[_size]; \
  44         }; \
  45         struct percpu_bin_data_##_size *__percpu_bin_data_##_size; \
  46         struct map_value_percpu_##_size { \
  47                 struct percpu_bin_data_##_size __percpu_kptr * data; \
  48         }; \
  49         struct { \
  50                 __uint(type, BPF_MAP_TYPE_ARRAY); \
  51                 __type(key, int); \
  52                 __type(value, struct map_value_percpu_##_size); \
  53                 __uint(max_entries, 128); \
  54         } array_percpu_##_size SEC(".maps")
  55
  56 static __always_inline void batch_alloc(struct bpf_map *map, unsigned int batch, unsigned int idx)
  57 {
  58         struct generic_map_value *value;
  59         unsigned int i, key;
  60         void *old, *new;
  61
  62         for (i = 0; i < batch; i++) {
  63                 key = i;
  64                 value = bpf_map_lookup_elem(map, &key);
  65                 if (!value) {
  66                         err = 1;
  67                         return;
  68                 }
  69                 new = bpf_obj_new_impl(data_btf_ids[idx], NULL);
  70                 if (!new) {
  71                         err = 2;
  72                         return;
  73                 }
  74                 old = bpf_kptr_xchg(&value->data, new);
  75                 if (old) {
  76                         bpf_obj_drop(old);
  77                         err = 3;
  78                         return;
  79                 }
  80         }
  81 }
  82
  83 static __always_inline void batch_free(struct bpf_map *map, unsigned int batch, unsigned int idx)
  84 {
  85         struct generic_map_value *value;
  86         unsigned int i, key;
  87         void *old;
  88
  89         for (i = 0; i < batch; i++) {
  90                 key = i;
  91                 value = bpf_map_lookup_elem(map, &key);
  92                 if (!value) {
  93                         err = 4;
  94                         return;
  95                 }
  96                 old = bpf_kptr_xchg(&value->data, NULL);
  97                 if (!old) {
  98                         err = 5;
  99                         return;
 100                 }
 101                 bpf_obj_drop(old);
 102         }
 103 }
 104
 105 static __always_inline void batch_percpu_alloc(struct bpf_map *map, unsigned int batch,
 106                                                unsigned int idx)
 107 {
 108         struct generic_map_value *value;
 109         unsigned int i, key;
 110         void *old, *new;
 111
 112         for (i = 0; i < batch; i++) {
 113                 key = i;
 114                 value = bpf_map_lookup_elem(map, &key);
 115                 if (!value) {
 116                         err = 1;
 117                         return;
 118                 }
 119                 /* per-cpu allocator may not be able to refill in time */
 120                 new = bpf_percpu_obj_new_impl(percpu_data_btf_ids[idx], NULL);
 121                 if (!new)
 122                         continue;
 123
 124                 old = bpf_kptr_xchg(&value->data, new);
 125                 if (old) {
 126                         bpf_percpu_obj_drop(old);
 127                         err = 2;
 128                         return;
 129                 }
 130         }
 131 }
 132
 133 static __always_inline void batch_percpu_free(struct bpf_map *map, unsigned int batch,
 134                                               unsigned int idx)
 135 {
 136         struct generic_map_value *value;
 137         unsigned int i, key;
 138         void *old;
 139
 140         for (i = 0; i < batch; i++) {
 141                 key = i;
 142                 value = bpf_map_lookup_elem(map, &key);
 143                 if (!value) {
 144                         err = 3;
 145                         return;
 146                 }
 147                 old = bpf_kptr_xchg(&value->data, NULL);
 148                 if (!old)
 149                         continue;
 150                 bpf_percpu_obj_drop(old);
 151         }
 152 }
 153
 154 #define CALL_BATCH_ALLOC(size, batch, idx) \
 155         batch_alloc((struct bpf_map *)(&array_##size), batch, idx)
 156
 157 #define CALL_BATCH_ALLOC_FREE(size, batch, idx) \
 158         do { \
 159                 batch_alloc((struct bpf_map *)(&array_##size), batch, idx); \
 160                 batch_free((struct bpf_map *)(&array_##size), batch, idx); \
 161         } while (0)
 162
 163 #define CALL_BATCH_PERCPU_ALLOC(size, batch, idx) \
 164         batch_percpu_alloc((struct bpf_map *)(&array_percpu_##size), batch, idx)
 165
 166 #define CALL_BATCH_PERCPU_ALLOC_FREE(size, batch, idx) \
 167         do { \
 168                 batch_percpu_alloc((struct bpf_map *)(&array_percpu_##size), batch, idx); \
 169                 batch_percpu_free((struct bpf_map *)(&array_percpu_##size), batch, idx); \
 170         } while (0)
 171
 172 /* kptr doesn't support bin_data_8 which is a zero-sized array */
 173 DEFINE_ARRAY_WITH_KPTR(16);
 174 DEFINE_ARRAY_WITH_KPTR(32);
 175 DEFINE_ARRAY_WITH_KPTR(64);
 176 DEFINE_ARRAY_WITH_KPTR(96);
 177 DEFINE_ARRAY_WITH_KPTR(128);
 178 DEFINE_ARRAY_WITH_KPTR(192);
 179 DEFINE_ARRAY_WITH_KPTR(256);
 180 DEFINE_ARRAY_WITH_KPTR(512);
 181 DEFINE_ARRAY_WITH_KPTR(1024);
 182 DEFINE_ARRAY_WITH_KPTR(2048);
 183 DEFINE_ARRAY_WITH_KPTR(4096);
 184
 185 DEFINE_ARRAY_WITH_PERCPU_KPTR(8);
 186 DEFINE_ARRAY_WITH_PERCPU_KPTR(16);
 187 DEFINE_ARRAY_WITH_PERCPU_KPTR(32);
 188 DEFINE_ARRAY_WITH_PERCPU_KPTR(64);
 189 DEFINE_ARRAY_WITH_PERCPU_KPTR(96);
 190 DEFINE_ARRAY_WITH_PERCPU_KPTR(128);
 191 DEFINE_ARRAY_WITH_PERCPU_KPTR(192);
 192 DEFINE_ARRAY_WITH_PERCPU_KPTR(256);
 193 DEFINE_ARRAY_WITH_PERCPU_KPTR(512);
 194
 195 SEC("?fentry/" SYS_PREFIX "sys_nanosleep")
 196 int test_batch_alloc_free(void *ctx)
 197 {
 198         if ((u32)bpf_get_current_pid_tgid() != pid)
 199                 return 0;
 200
 201         /* Alloc 128 16-bytes objects in batch to trigger refilling,
 202          * then free 128 16-bytes objects in batch to trigger freeing.
 203          */
 204         CALL_BATCH_ALLOC_FREE(16, 128, 0);
 205         CALL_BATCH_ALLOC_FREE(32, 128, 1);
 206         CALL_BATCH_ALLOC_FREE(64, 128, 2);
 207         CALL_BATCH_ALLOC_FREE(96, 128, 3);
 208         CALL_BATCH_ALLOC_FREE(128, 128, 4);
 209         CALL_BATCH_ALLOC_FREE(192, 128, 5);
 210         CALL_BATCH_ALLOC_FREE(256, 128, 6);
 211         CALL_BATCH_ALLOC_FREE(512, 64, 7);
 212         CALL_BATCH_ALLOC_FREE(1024, 32, 8);
 213         CALL_BATCH_ALLOC_FREE(2048, 16, 9);
 214         CALL_BATCH_ALLOC_FREE(4096, 8, 10);
 215
 216         return 0;
 217 }
 218
 219 SEC("?fentry/" SYS_PREFIX "sys_nanosleep")
 220 int test_free_through_map_free(void *ctx)
 221 {
 222         if ((u32)bpf_get_current_pid_tgid() != pid)
 223                 return 0;
 224
 225         /* Alloc 128 16-bytes objects in batch to trigger refilling,
 226          * then free these objects through map free.
 227          */
 228         CALL_BATCH_ALLOC(16, 128, 0);
 229         CALL_BATCH_ALLOC(32, 128, 1);
 230         CALL_BATCH_ALLOC(64, 128, 2);
 231         CALL_BATCH_ALLOC(96, 128, 3);
 232         CALL_BATCH_ALLOC(128, 128, 4);
 233         CALL_BATCH_ALLOC(192, 128, 5);
 234         CALL_BATCH_ALLOC(256, 128, 6);
 235         CALL_BATCH_ALLOC(512, 64, 7);
 236         CALL_BATCH_ALLOC(1024, 32, 8);
 237         CALL_BATCH_ALLOC(2048, 16, 9);
 238         CALL_BATCH_ALLOC(4096, 8, 10);
 239
 240         return 0;
 241 }
 242
 243 SEC("?fentry/" SYS_PREFIX "sys_nanosleep")
 244 int test_batch_percpu_alloc_free(void *ctx)
 245 {
 246         if ((u32)bpf_get_current_pid_tgid() != pid)
 247                 return 0;
 248
 249         /* Alloc 128 8-bytes per-cpu objects in batch to trigger refilling,
 250          * then free 128 8-bytes per-cpu objects in batch to trigger freeing.
 251          */
 252         CALL_BATCH_PERCPU_ALLOC_FREE(8, 128, 0);
 253         CALL_BATCH_PERCPU_ALLOC_FREE(16, 128, 1);
 254         CALL_BATCH_PERCPU_ALLOC_FREE(32, 128, 2);
 255         CALL_BATCH_PERCPU_ALLOC_FREE(64, 128, 3);
 256         CALL_BATCH_PERCPU_ALLOC_FREE(96, 128, 4);
 257         CALL_BATCH_PERCPU_ALLOC_FREE(128, 128, 5);
 258         CALL_BATCH_PERCPU_ALLOC_FREE(192, 128, 6);
 259         CALL_BATCH_PERCPU_ALLOC_FREE(256, 128, 7);
 260         CALL_BATCH_PERCPU_ALLOC_FREE(512, 64, 8);
 261
 262         return 0;
 263 }
 264
 265 SEC("?fentry/" SYS_PREFIX "sys_nanosleep")
 266 int test_percpu_free_through_map_free(void *ctx)
 267 {
 268         if ((u32)bpf_get_current_pid_tgid() != pid)
 269                 return 0;
 270
 271         /* Alloc 128 8-bytes per-cpu objects in batch to trigger refilling,
 272          * then free these object through map free.
 273          */
 274         CALL_BATCH_PERCPU_ALLOC(8, 128, 0);
 275         CALL_BATCH_PERCPU_ALLOC(16, 128, 1);
 276         CALL_BATCH_PERCPU_ALLOC(32, 128, 2);
 277         CALL_BATCH_PERCPU_ALLOC(64, 128, 3);
 278         CALL_BATCH_PERCPU_ALLOC(96, 128, 4);
 279         CALL_BATCH_PERCPU_ALLOC(128, 128, 5);
 280         CALL_BATCH_PERCPU_ALLOC(192, 128, 6);
 281         CALL_BATCH_PERCPU_ALLOC(256, 128, 7);
 282         CALL_BATCH_PERCPU_ALLOC(512, 64, 8);
 283
 284         return 0;
 285 }