tools/testing/selftests/bpf/prog_tests/pinning.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include <sys/types.h>
   4 #include <sys/stat.h>
   5 #include <unistd.h>
   6 #include <test_progs.h>
   7
   8 __u32 get_map_id(struct bpf_object *obj, const char *name)
   9 {
  10         struct bpf_map_info map_info = {};
  11         __u32 map_info_len, duration = 0;
  12         struct bpf_map *map;
  13         int err;
  14
  15         map_info_len = sizeof(map_info);
  16
  17         map = bpf_object__find_map_by_name(obj, name);
  18         if (CHECK(!map, "find map", "NULL map"))
  19                 return 0;
  20
  21         err = bpf_obj_get_info_by_fd(bpf_map__fd(map),
  22                                      &map_info, &map_info_len);
  23         CHECK(err, "get map info", "err %d errno %d", err, errno);
  24         return map_info.id;
  25 }
  26
  27 void test_pinning(void)
  28 {
  29         const char *file_invalid = "./test_pinning_invalid.o";
  30         const char *custpinpath = "/sys/fs/bpf/custom/pinmap";
  31         const char *nopinpath = "/sys/fs/bpf/nopinmap";
  32         const char *nopinpath2 = "/sys/fs/bpf/nopinmap2";
  33         const char *custpath = "/sys/fs/bpf/custom";
  34         const char *pinpath = "/sys/fs/bpf/pinmap";
  35         const char *file = "./test_pinning.o";
  36         __u32 map_id, map_id2, duration = 0;
  37         struct stat statbuf = {};
  38         struct bpf_object *obj;
  39         struct bpf_map *map;
  40         int err, map_fd;
  41         DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts,
  42                 .pin_root_path = custpath,
  43         );
  44
  45         /* check that opening fails with invalid pinning value in map def */
  46         obj = bpf_object__open_file(file_invalid, NULL);
  47         err = libbpf_get_error(obj);
  48         if (CHECK(err != -EINVAL, "invalid open", "err %d errno %d\n", err, errno)) {
  49                 obj = NULL;
  50                 goto out;
  51         }
  52
  53         /* open the valid object file  */
  54         obj = bpf_object__open_file(file, NULL);
  55         err = libbpf_get_error(obj);
  56         if (CHECK(err, "default open", "err %d errno %d\n", err, errno)) {
  57                 obj = NULL;
  58                 goto out;
  59         }
  60
  61         err = bpf_object__load(obj);
  62         if (CHECK(err, "default load", "err %d errno %d\n", err, errno))
  63                 goto out;
  64
  65         /* check that pinmap was pinned */
  66         err = stat(pinpath, &statbuf);
  67         if (CHECK(err, "stat pinpath", "err %d errno %d\n", err, errno))
  68                 goto out;
  69
  70         /* check that nopinmap was *not* pinned */
  71         err = stat(nopinpath, &statbuf);
  72         if (CHECK(!err || errno != ENOENT, "stat nopinpath",
  73                   "err %d errno %d\n", err, errno))
  74                 goto out;
  75
  76         /* check that nopinmap2 was *not* pinned */
  77         err = stat(nopinpath2, &statbuf);
  78         if (CHECK(!err || errno != ENOENT, "stat nopinpath2",
  79                   "err %d errno %d\n", err, errno))
  80                 goto out;
  81
  82         map_id = get_map_id(obj, "pinmap");
  83         if (!map_id)
  84                 goto out;
  85
  86         bpf_object__close(obj);
  87
  88         obj = bpf_object__open_file(file, NULL);
  89         if (CHECK_FAIL(libbpf_get_error(obj))) {
  90                 obj = NULL;
  91                 goto out;
  92         }
  93
  94         err = bpf_object__load(obj);
  95         if (CHECK(err, "default load", "err %d errno %d\n", err, errno))
  96                 goto out;
  97
  98         /* check that same map ID was reused for second load */
  99         map_id2 = get_map_id(obj, "pinmap");
 100         if (CHECK(map_id != map_id2, "check reuse",
 101                   "err %d errno %d id %d id2 %d\n", err, errno, map_id, map_id2))
 102                 goto out;
 103
 104         /* should be no-op to re-pin same map */
 105         map = bpf_object__find_map_by_name(obj, "pinmap");
 106         if (CHECK(!map, "find map", "NULL map"))
 107                 goto out;
 108
 109         err = bpf_map__pin(map, NULL);
 110         if (CHECK(err, "re-pin map", "err %d errno %d\n", err, errno))
 111                 goto out;
 112
 113         /* but error to pin at different location */
 114         err = bpf_map__pin(map, "/sys/fs/bpf/other");
 115         if (CHECK(!err, "pin map different", "err %d errno %d\n", err, errno))
 116                 goto out;
 117
 118         /* unpin maps with a pin_path set */
 119         err = bpf_object__unpin_maps(obj, NULL);
 120         if (CHECK(err, "unpin maps", "err %d errno %d\n", err, errno))
 121                 goto out;
 122
 123         /* and re-pin them... */
 124         err = bpf_object__pin_maps(obj, NULL);
 125         if (CHECK(err, "pin maps", "err %d errno %d\n", err, errno))
 126                 goto out;
 127
 128         /* set pinning path of other map and re-pin all */
 129         map = bpf_object__find_map_by_name(obj, "nopinmap");
 130         if (CHECK(!map, "find map", "NULL map"))
 131                 goto out;
 132
 133         err = bpf_map__set_pin_path(map, custpinpath);
 134         if (CHECK(err, "set pin path", "err %d errno %d\n", err, errno))
 135                 goto out;
 136
 137         /* should only pin the one unpinned map */
 138         err = bpf_object__pin_maps(obj, NULL);
 139         if (CHECK(err, "pin maps", "err %d errno %d\n", err, errno))
 140                 goto out;
 141
 142         /* check that nopinmap was pinned at the custom path */
 143         err = stat(custpinpath, &statbuf);
 144         if (CHECK(err, "stat custpinpath", "err %d errno %d\n", err, errno))
 145                 goto out;
 146
 147         /* remove the custom pin path to re-test it with auto-pinning below */
 148         err = unlink(custpinpath);
 149         if (CHECK(err, "unlink custpinpath", "err %d errno %d\n", err, errno))
 150                 goto out;
 151
 152         err = rmdir(custpath);
 153         if (CHECK(err, "rmdir custpindir", "err %d errno %d\n", err, errno))
 154                 goto out;
 155
 156         bpf_object__close(obj);
 157
 158         /* open the valid object file again */
 159         obj = bpf_object__open_file(file, NULL);
 160         err = libbpf_get_error(obj);
 161         if (CHECK(err, "default open", "err %d errno %d\n", err, errno)) {
 162                 obj = NULL;
 163                 goto out;
 164         }
 165
 166         /* set pin paths so that nopinmap2 will attempt to reuse the map at
 167          * pinpath (which will fail), but not before pinmap has already been
 168          * reused
 169          */
 170         bpf_object__for_each_map(map, obj) {
 171                 if (!strcmp(bpf_map__name(map), "nopinmap"))
 172                         err = bpf_map__set_pin_path(map, nopinpath2);
 173                 else if (!strcmp(bpf_map__name(map), "nopinmap2"))
 174                         err = bpf_map__set_pin_path(map, pinpath);
 175                 else
 176                         continue;
 177
 178                 if (CHECK(err, "set pin path", "err %d errno %d\n", err, errno))
 179                         goto out;
 180         }
 181
 182         /* should fail because of map parameter mismatch */
 183         err = bpf_object__load(obj);
 184         if (CHECK(err != -EINVAL, "param mismatch load", "err %d errno %d\n", err, errno))
 185                 goto out;
 186
 187         /* nopinmap2 should have been pinned and cleaned up again */
 188         err = stat(nopinpath2, &statbuf);
 189         if (CHECK(!err || errno != ENOENT, "stat nopinpath2",
 190                   "err %d errno %d\n", err, errno))
 191                 goto out;
 192
 193         /* pinmap should still be there */
 194         err = stat(pinpath, &statbuf);
 195         if (CHECK(err, "stat pinpath", "err %d errno %d\n", err, errno))
 196                 goto out;
 197
 198         bpf_object__close(obj);
 199
 200         /* test auto-pinning at custom path with open opt */
 201         obj = bpf_object__open_file(file, &opts);
 202         if (CHECK_FAIL(libbpf_get_error(obj))) {
 203                 obj = NULL;
 204                 goto out;
 205         }
 206
 207         err = bpf_object__load(obj);
 208         if (CHECK(err, "custom load", "err %d errno %d\n", err, errno))
 209                 goto out;
 210
 211         /* check that pinmap was pinned at the custom path */
 212         err = stat(custpinpath, &statbuf);
 213         if (CHECK(err, "stat custpinpath", "err %d errno %d\n", err, errno))
 214                 goto out;
 215
 216         /* remove the custom pin path to re-test it with reuse fd below */
 217         err = unlink(custpinpath);
 218         if (CHECK(err, "unlink custpinpath", "err %d errno %d\n", err, errno))
 219                 goto out;
 220
 221         err = rmdir(custpath);
 222         if (CHECK(err, "rmdir custpindir", "err %d errno %d\n", err, errno))
 223                 goto out;
 224
 225         bpf_object__close(obj);
 226
 227         /* test pinning at custom path with reuse fd */
 228         obj = bpf_object__open_file(file, NULL);
 229         err = libbpf_get_error(obj);
 230         if (CHECK(err, "default open", "err %d errno %d\n", err, errno)) {
 231                 obj = NULL;
 232                 goto out;
 233         }
 234
 235         map_fd = bpf_create_map(BPF_MAP_TYPE_ARRAY, sizeof(__u32),
 236                                 sizeof(__u64), 1, 0);
 237         if (CHECK(map_fd < 0, "create pinmap manually", "fd %d\n", map_fd))
 238                 goto out;
 239
 240         map = bpf_object__find_map_by_name(obj, "pinmap");
 241         if (CHECK(!map, "find map", "NULL map"))
 242                 goto close_map_fd;
 243
 244         err = bpf_map__reuse_fd(map, map_fd);
 245         if (CHECK(err, "reuse pinmap fd", "err %d errno %d\n", err, errno))
 246                 goto close_map_fd;
 247
 248         err = bpf_map__set_pin_path(map, custpinpath);
 249         if (CHECK(err, "set pin path", "err %d errno %d\n", err, errno))
 250                 goto close_map_fd;
 251
 252         err = bpf_object__load(obj);
 253         if (CHECK(err, "custom load", "err %d errno %d\n", err, errno))
 254                 goto close_map_fd;
 255
 256         /* check that pinmap was pinned at the custom path */
 257         err = stat(custpinpath, &statbuf);
 258         if (CHECK(err, "stat custpinpath", "err %d errno %d\n", err, errno))
 259                 goto close_map_fd;
 260
 261 close_map_fd:
 262         close(map_fd);
 263 out:
 264         unlink(pinpath);
 265         unlink(nopinpath);
 266         unlink(nopinpath2);
 267         unlink(custpinpath);
 268         rmdir(custpath);
 269         if (obj)
 270                 bpf_object__close(obj);
 271 }