lib/librte_eal/common/eal_common_trace_utils.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(C) 2020 Marvell International Ltd.
   3  */
   4
   5 #include <fnmatch.h>
   6 #include <pwd.h>
   7 #include <sys/stat.h>
   8 #include <time.h>
   9
  10 #include <rte_common.h>
  11 #include <rte_errno.h>
  12 #include <rte_string_fns.h>
  13
  14 #include "eal_filesystem.h"
  15 #include "eal_trace.h"
  16
  17 const char *
  18 trace_mode_to_string(enum rte_trace_mode mode)
  19 {
  20         switch (mode) {
  21         case RTE_TRACE_MODE_OVERWRITE: return "overwrite";
  22         case RTE_TRACE_MODE_DISCARD: return "discard";
  23         default: return "unknown";
  24         }
  25 }
  26
  27 const char *
  28 trace_area_to_string(enum trace_area_e area)
  29 {
  30         switch (area) {
  31         case TRACE_AREA_HEAP: return "heap";
  32         case TRACE_AREA_HUGEPAGE: return "hugepage";
  33         default: return "unknown";
  34         }
  35 }
  36
  37 static bool
  38 trace_entry_compare(const char *name)
  39 {
  40         struct trace_point_head *tp_list = trace_list_head_get();
  41         struct trace_point *tp;
  42         int count = 0;
  43
  44         STAILQ_FOREACH(tp, tp_list, next) {
  45                 if (strncmp(tp->name, name, TRACE_POINT_NAME_SIZE) == 0)
  46                         count++;
  47                 if (count > 1) {
  48                         trace_err("found duplicate entry %s", name);
  49                         rte_errno = EEXIST;
  50                         return true;
  51                 }
  52         }
  53         return false;
  54 }
  55
  56 bool
  57 trace_has_duplicate_entry(void)
  58 {
  59         struct trace_point_head *tp_list = trace_list_head_get();
  60         struct trace_point *tp;
  61
  62         /* Is duplicate trace name registered */
  63         STAILQ_FOREACH(tp, tp_list, next)
  64                 if (trace_entry_compare(tp->name))
  65                         return true;
  66
  67         return false;
  68 }
  69
  70 void
  71 trace_uuid_generate(void)
  72 {
  73         struct trace_point_head *tp_list = trace_list_head_get();
  74         struct trace *trace = trace_obj_get();
  75         struct trace_point *tp;
  76         uint64_t sz_total = 0;
  77
  78         /* Go over the registered trace points to get total size of events */
  79         STAILQ_FOREACH(tp, tp_list, next) {
  80                 const uint16_t sz = *tp->handle & __RTE_TRACE_FIELD_SIZE_MASK;
  81                 sz_total += sz;
  82         }
  83
  84         rte_uuid_t uuid = RTE_UUID_INIT(sz_total, trace->nb_trace_points,
  85                 0x4370, 0x8f50, 0x222ddd514176ULL);
  86         rte_uuid_copy(trace->uuid, uuid);
  87 }
  88
  89 static int
  90 trace_session_name_generate(char *trace_dir)
  91 {
  92         struct tm *tm_result;
  93         time_t tm;
  94         int rc;
  95
  96         tm = time(NULL);
  97         if ((int)tm == -1)
  98                 goto fail;
  99
 100         tm_result = localtime(&tm);
 101         if (tm_result == NULL)
 102                 goto fail;
 103
 104         rc = rte_strscpy(trace_dir, eal_get_hugefile_prefix(),
 105                         TRACE_PREFIX_LEN);
 106         if (rc == -E2BIG)
 107                 rc = TRACE_PREFIX_LEN;
 108         trace_dir[rc++] = '-';
 109
 110         rc = strftime(trace_dir + rc, TRACE_DIR_STR_LEN - rc,
 111                         "%Y-%m-%d-%p-%I-%M-%S", tm_result);
 112         if (rc == 0)
 113                 goto fail;
 114
 115         return rc;
 116 fail:
 117         rte_errno = errno;
 118         return -rte_errno;
 119 }
 120
 121 static int
 122 trace_dir_update(const char *str)
 123 {
 124         struct trace *trace = trace_obj_get();
 125         int rc, remaining;
 126
 127         remaining = sizeof(trace->dir) - trace->dir_offset;
 128         rc = rte_strscpy(&trace->dir[0] + trace->dir_offset, str, remaining);
 129         if (rc < 0)
 130                 goto fail;
 131
 132         trace->dir_offset += rc;
 133 fail:
 134         return rc;
 135 }
 136
 137 int
 138 eal_trace_args_save(const char *val)
 139 {
 140         struct trace *trace = trace_obj_get();
 141         char *trace_args;
 142         uint8_t nb_args;
 143
 144         nb_args = trace->args.nb_args;
 145
 146         if (nb_args >= TRACE_MAX_ARGS) {
 147                 trace_err("ignoring trace %s as limit exceeds", val);
 148                 return 0;
 149         }
 150
 151         trace_args = calloc(1, (strlen(val) + 1));
 152         if (trace_args == NULL) {
 153                 trace_err("fail to allocate memory for %s", val);
 154                 return -ENOMEM;
 155         }
 156
 157         memcpy(trace_args, val, strlen(val));
 158         trace->args.args[nb_args++] = trace_args;
 159         trace->args.nb_args = nb_args;
 160         return 0;
 161 }
 162
 163 void
 164 eal_trace_args_free(void)
 165 {
 166         struct trace *trace = trace_obj_get();
 167         int i;
 168
 169         for (i = 0; i < trace->args.nb_args; i++) {
 170                 if (trace->args.args[i]) {
 171                         free((void *)trace->args.args[i]);
 172                         trace->args.args[i] = NULL;
 173                 }
 174         }
 175 }
 176
 177 int
 178 trace_args_apply(const char *arg)
 179 {
 180         char *str;
 181
 182         str = strdup(arg);
 183         if (str == NULL)
 184                 return -1;
 185
 186         if (rte_trace_regexp(str, true) < 0) {
 187                 trace_err("cannot enable trace for %s", str);
 188                 free(str);
 189                 return -1;
 190         }
 191
 192         free(str);
 193         return 0;
 194 }
 195
 196 int
 197 eal_trace_bufsz_args_save(char const *val)
 198 {
 199         struct trace *trace = trace_obj_get();
 200         uint64_t bufsz;
 201
 202         bufsz = rte_str_to_size(val);
 203         if (bufsz == 0) {
 204                 trace_err("buffer size cannot be zero");
 205                 return -EINVAL;
 206         }
 207
 208         trace->buff_len = bufsz;
 209         return 0;
 210 }
 211
 212 void
 213 trace_bufsz_args_apply(void)
 214 {
 215         struct trace *trace = trace_obj_get();
 216
 217         if (trace->buff_len == 0)
 218                 trace->buff_len = 1024 * 1024; /* 1MB */
 219 }
 220
 221 int
 222 eal_trace_mode_args_save(const char *val)
 223 {
 224         struct trace *trace = trace_obj_get();
 225         size_t len = strlen(val);
 226         unsigned long tmp;
 227         char *pattern;
 228
 229         if (len == 0) {
 230                 trace_err("value is not provided with option");
 231                 return -EINVAL;
 232         }
 233
 234         pattern = (char *)calloc(1, len + 2);
 235         if (pattern == NULL) {
 236                 trace_err("fail to allocate memory");
 237                 return -ENOMEM;
 238         }
 239
 240         sprintf(pattern, "%s*", val);
 241
 242         if (fnmatch(pattern, "overwrite", 0) == 0)
 243                 tmp = RTE_TRACE_MODE_OVERWRITE;
 244         else if (fnmatch(pattern, "discard", 0) == 0)
 245                 tmp = RTE_TRACE_MODE_DISCARD;
 246         else {
 247                 free(pattern);
 248                 return -EINVAL;
 249         }
 250
 251         trace->mode = tmp;
 252         free(pattern);
 253         return 0;
 254 }
 255
 256 int
 257 eal_trace_dir_args_save(char const *val)
 258 {
 259         struct trace *trace = trace_obj_get();
 260         uint32_t size = sizeof(trace->dir);
 261         char *dir_path = NULL;
 262         int rc;
 263
 264         if (strlen(val) >= size) {
 265                 trace_err("input string is too big");
 266                 return -ENAMETOOLONG;
 267         }
 268
 269         dir_path = (char *)calloc(1, size);
 270         if (dir_path == NULL) {
 271                 trace_err("fail to allocate memory");
 272                 return -ENOMEM;
 273         }
 274
 275         sprintf(dir_path, "%s/", val);
 276         rc = trace_dir_update(dir_path);
 277
 278         free(dir_path);
 279         return rc;
 280 }
 281
 282 int
 283 trace_epoch_time_save(void)
 284 {
 285         struct trace *trace = trace_obj_get();
 286         struct timespec epoch = { 0, 0 };
 287         uint64_t avg, start, end;
 288
 289         start = rte_get_tsc_cycles();
 290         if (clock_gettime(CLOCK_REALTIME, &epoch) < 0) {
 291                 trace_err("failed to get the epoch time");
 292                 return -1;
 293         }
 294         end = rte_get_tsc_cycles();
 295         avg = (start + end) >> 1;
 296
 297         trace->epoch_sec = (uint64_t) epoch.tv_sec;
 298         trace->epoch_nsec = (uint64_t) epoch.tv_nsec;
 299         trace->uptime_ticks = avg;
 300
 301         return 0;
 302 }
 303
 304 static int
 305 trace_dir_default_path_get(char *dir_path)
 306 {
 307         struct trace *trace = trace_obj_get();
 308         uint32_t size = sizeof(trace->dir);
 309         struct passwd *pwd;
 310         char *home_dir;
 311
 312         /* First check for shell environment variable */
 313         home_dir = getenv("HOME");
 314         if (home_dir == NULL) {
 315                 /* Fallback to password file entry */
 316                 pwd = getpwuid(getuid());
 317                 if (pwd == NULL)
 318                         return -EINVAL;
 319
 320                 home_dir = pwd->pw_dir;
 321         }
 322
 323         /* Append dpdk-traces to directory */
 324         if (snprintf(dir_path, size, "%s/dpdk-traces/", home_dir) < 0)
 325                 return -ENAMETOOLONG;
 326
 327         return 0;
 328 }
 329
 330 int
 331 trace_mkdir(void)
 332 {
 333         struct trace *trace = trace_obj_get();
 334         char session[TRACE_DIR_STR_LEN];
 335         char *dir_path;
 336         int rc;
 337
 338         if (!trace->dir_offset) {
 339                 dir_path = calloc(1, sizeof(trace->dir));
 340                 if (dir_path == NULL) {
 341                         trace_err("fail to allocate memory");
 342                         return -ENOMEM;
 343                 }
 344
 345                 rc = trace_dir_default_path_get(dir_path);
 346                 if (rc < 0) {
 347                         trace_err("fail to get default path");
 348                         free(dir_path);
 349                         return rc;
 350                 }
 351
 352                 rc = trace_dir_update(dir_path);
 353                 free(dir_path);
 354                 if (rc < 0)
 355                         return rc;
 356         }
 357
 358         /* Create the path if it t exist, no "mkdir -p" available here */
 359         rc = mkdir(trace->dir, 0700);
 360         if (rc < 0 && errno != EEXIST) {
 361                 trace_err("mkdir %s failed [%s]", trace->dir, strerror(errno));
 362                 rte_errno = errno;
 363                 return -rte_errno;
 364         }
 365
 366         rc = trace_session_name_generate(session);
 367         if (rc < 0)
 368                 return rc;
 369         rc = trace_dir_update(session);
 370         if (rc < 0)
 371                 return rc;
 372
 373         rc = mkdir(trace->dir, 0700);
 374         if (rc < 0) {
 375                 trace_err("mkdir %s failed [%s]", trace->dir, strerror(errno));
 376                 rte_errno = errno;
 377                 return -rte_errno;
 378         }
 379
 380         RTE_LOG(INFO, EAL, "Trace dir: %s\n", trace->dir);
 381         return 0;
 382 }
 383
 384 static int
 385 trace_meta_save(struct trace *trace)
 386 {
 387         char file_name[PATH_MAX];
 388         FILE *f;
 389         int rc;
 390
 391         rc = snprintf(file_name, PATH_MAX, "%s/metadata", trace->dir);
 392         if (rc < 0)
 393                 return rc;
 394
 395         f = fopen(file_name, "w");
 396         if (f == NULL)
 397                 return -errno;
 398
 399         rc = rte_trace_metadata_dump(f);
 400
 401         if (fclose(f))
 402                 rc = -errno;
 403
 404         return rc;
 405 }
 406
 407
 408 static inline int
 409 trace_file_sz(struct __rte_trace_header *hdr)
 410 {
 411         return sizeof(struct __rte_trace_stream_header) + hdr->offset;
 412 }
 413
 414 static int
 415 trace_mem_save(struct trace *trace, struct __rte_trace_header *hdr,
 416                 uint32_t cnt)
 417 {
 418         char file_name[PATH_MAX];
 419         FILE *f;
 420         int rc;
 421
 422         rc = snprintf(file_name, PATH_MAX, "%s/channel0_%d", trace->dir, cnt);
 423         if (rc < 0)
 424                 return rc;
 425
 426         f = fopen(file_name, "w");
 427         if (f == NULL)
 428                 return -errno;
 429
 430         rc = fwrite(&hdr->stream_header, trace_file_sz(hdr), 1, f);
 431         rc = (rc == 1) ?  0 : -EACCES;
 432
 433         if (fclose(f))
 434                 rc = -errno;
 435
 436         return rc;
 437 }
 438
 439 int
 440 rte_trace_save(void)
 441 {
 442         struct trace *trace = trace_obj_get();
 443         struct __rte_trace_header *header;
 444         uint32_t count;
 445         int rc = 0;
 446
 447         if (trace->nb_trace_mem_list == 0)
 448                 return rc;
 449
 450         rc = trace_meta_save(trace);
 451         if (rc)
 452                 return rc;
 453
 454         rte_spinlock_lock(&trace->lock);
 455         for (count = 0; count < trace->nb_trace_mem_list; count++) {
 456                 header = trace->lcore_meta[count].mem;
 457                 rc =  trace_mem_save(trace, header, count);
 458                 if (rc)
 459                         break;
 460         }
 461         rte_spinlock_unlock(&trace->lock);
 462         return rc;
 463 }