ceph/src/spdk/dpdk/lib/librte_eal/common/eal_common_devargs.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright 2014 6WIND S.A.
   3  */
   4
   5 /* This file manages the list of devices and their arguments, as given
   6  * by the user at startup
   7  */
   8
   9 #include <stdio.h>
  10 #include <string.h>
  11 #include <stdarg.h>
  12
  13 #include <rte_bus.h>
  14 #include <rte_class.h>
  15 #include <rte_compat.h>
  16 #include <rte_dev.h>
  17 #include <rte_devargs.h>
  18 #include <rte_errno.h>
  19 #include <rte_kvargs.h>
  20 #include <rte_log.h>
  21 #include <rte_tailq.h>
  22 #include "eal_private.h"
  23
  24 /** user device double-linked queue type definition */
  25 TAILQ_HEAD(rte_devargs_list, rte_devargs);
  26
  27 /** Global list of user devices */
  28 static struct rte_devargs_list devargs_list =
  29         TAILQ_HEAD_INITIALIZER(devargs_list);
  30
  31 static size_t
  32 devargs_layer_count(const char *s)
  33 {
  34         size_t i = s ? 1 : 0;
  35
  36         while (s != NULL && s[0] != '\0') {
  37                 i += s[0] == '/';
  38                 s++;
  39         }
  40         return i;
  41 }
  42
  43 int
  44 rte_devargs_layers_parse(struct rte_devargs *devargs,
  45                          const char *devstr)
  46 {
  47         struct {
  48                 const char *key;
  49                 const char *str;
  50                 struct rte_kvargs *kvlist;
  51         } layers[] = {
  52                 { "bus=",    NULL, NULL, },
  53                 { "class=",  NULL, NULL, },
  54                 { "driver=", NULL, NULL, },
  55         };
  56         struct rte_kvargs_pair *kv = NULL;
  57         struct rte_class *cls = NULL;
  58         struct rte_bus *bus = NULL;
  59         const char *s = devstr;
  60         size_t nblayer;
  61         size_t i = 0;
  62         int ret = 0;
  63
  64         /* Split each sub-lists. */
  65         nblayer = devargs_layer_count(devstr);
  66         if (nblayer > RTE_DIM(layers)) {
  67                 RTE_LOG(ERR, EAL, "Invalid format: too many layers (%zu)\n",
  68                         nblayer);
  69                 ret = -E2BIG;
  70                 goto get_out;
  71         }
  72
  73         /* If the devargs points the devstr
  74          * as source data, then it should not allocate
  75          * anything and keep referring only to it.
  76          */
  77         if (devargs->data != devstr) {
  78                 devargs->data = strdup(devstr);
  79                 if (devargs->data == NULL) {
  80                         RTE_LOG(ERR, EAL, "OOM\n");
  81                         ret = -ENOMEM;
  82                         goto get_out;
  83                 }
  84                 s = devargs->data;
  85         }
  86
  87         while (s != NULL) {
  88                 if (i >= RTE_DIM(layers)) {
  89                         RTE_LOG(ERR, EAL, "Unrecognized layer %s\n", s);
  90                         ret = -EINVAL;
  91                         goto get_out;
  92                 }
  93                 /*
  94                  * The last layer is free-form.
  95                  * The "driver" key is not required (but accepted).
  96                  */
  97                 if (strncmp(layers[i].key, s, strlen(layers[i].key)) &&
  98                                 i != RTE_DIM(layers) - 1)
  99                         goto next_layer;
 100                 layers[i].str = s;
 101                 layers[i].kvlist = rte_kvargs_parse_delim(s, NULL, "/");
 102                 if (layers[i].kvlist == NULL) {
 103                         RTE_LOG(ERR, EAL, "Could not parse %s\n", s);
 104                         ret = -EINVAL;
 105                         goto get_out;
 106                 }
 107                 s = strchr(s, '/');
 108                 if (s != NULL)
 109                         s++;
 110 next_layer:
 111                 i++;
 112         }
 113
 114         /* Parse each sub-list. */
 115         for (i = 0; i < RTE_DIM(layers); i++) {
 116                 if (layers[i].kvlist == NULL)
 117                         continue;
 118                 kv = &layers[i].kvlist->pairs[0];
 119                 if (strcmp(kv->key, "bus") == 0) {
 120                         bus = rte_bus_find_by_name(kv->value);
 121                         if (bus == NULL) {
 122                                 RTE_LOG(ERR, EAL, "Could not find bus \"%s\"\n",
 123                                         kv->value);
 124                                 ret = -EFAULT;
 125                                 goto get_out;
 126                         }
 127                 } else if (strcmp(kv->key, "class") == 0) {
 128                         cls = rte_class_find_by_name(kv->value);
 129                         if (cls == NULL) {
 130                                 RTE_LOG(ERR, EAL, "Could not find class \"%s\"\n",
 131                                         kv->value);
 132                                 ret = -EFAULT;
 133                                 goto get_out;
 134                         }
 135                 } else if (strcmp(kv->key, "driver") == 0) {
 136                         /* Ignore */
 137                         continue;
 138                 }
 139         }
 140
 141         /* Fill devargs fields. */
 142         devargs->bus_str = layers[0].str;
 143         devargs->cls_str = layers[1].str;
 144         devargs->drv_str = layers[2].str;
 145         devargs->bus = bus;
 146         devargs->cls = cls;
 147
 148         /* If we own the data, clean up a bit
 149          * the several layers string, to ease
 150          * their parsing afterward.
 151          */
 152         if (devargs->data != devstr) {
 153                 char *s = (void *)(intptr_t)(devargs->data);
 154
 155                 while ((s = strchr(s, '/'))) {
 156                         *s = '\0';
 157                         s++;
 158                 }
 159         }
 160
 161 get_out:
 162         for (i = 0; i < RTE_DIM(layers); i++) {
 163                 if (layers[i].kvlist)
 164                         rte_kvargs_free(layers[i].kvlist);
 165         }
 166         if (ret != 0)
 167                 rte_errno = -ret;
 168         return ret;
 169 }
 170
 171 static int
 172 bus_name_cmp(const struct rte_bus *bus, const void *name)
 173 {
 174         return strncmp(bus->name, name, strlen(bus->name));
 175 }
 176
 177 int
 178 rte_devargs_parse(struct rte_devargs *da, const char *dev)
 179 {
 180         struct rte_bus *bus = NULL;
 181         const char *devname;
 182         const size_t maxlen = sizeof(da->name);
 183         size_t i;
 184
 185         if (da == NULL)
 186                 return -EINVAL;
 187
 188         /* Retrieve eventual bus info */
 189         do {
 190                 devname = dev;
 191                 bus = rte_bus_find(bus, bus_name_cmp, dev);
 192                 if (bus == NULL)
 193                         break;
 194                 devname = dev + strlen(bus->name) + 1;
 195                 if (rte_bus_find_by_device_name(devname) == bus)
 196                         break;
 197         } while (1);
 198         /* Store device name */
 199         i = 0;
 200         while (devname[i] != '\0' && devname[i] != ',') {
 201                 da->name[i] = devname[i];
 202                 i++;
 203                 if (i == maxlen) {
 204                         RTE_LOG(WARNING, EAL, "Parsing \"%s\": device name should be shorter than %zu\n",
 205                                 dev, maxlen);
 206                         da->name[i - 1] = '\0';
 207                         return -EINVAL;
 208                 }
 209         }
 210         da->name[i] = '\0';
 211         if (bus == NULL) {
 212                 bus = rte_bus_find_by_device_name(da->name);
 213                 if (bus == NULL) {
 214                         RTE_LOG(ERR, EAL, "failed to parse device \"%s\"\n",
 215                                 da->name);
 216                         return -EFAULT;
 217                 }
 218         }
 219         da->bus = bus;
 220         /* Parse eventual device arguments */
 221         if (devname[i] == ',')
 222                 da->args = strdup(&devname[i + 1]);
 223         else
 224                 da->args = strdup("");
 225         if (da->args == NULL) {
 226                 RTE_LOG(ERR, EAL, "not enough memory to parse arguments\n");
 227                 return -ENOMEM;
 228         }
 229         return 0;
 230 }
 231
 232 int
 233 rte_devargs_parsef(struct rte_devargs *da, const char *format, ...)
 234 {
 235         va_list ap;
 236         size_t len;
 237         char *dev;
 238         int ret;
 239
 240         if (da == NULL)
 241                 return -EINVAL;
 242
 243         va_start(ap, format);
 244         len = vsnprintf(NULL, 0, format, ap);
 245         va_end(ap);
 246
 247         dev = calloc(1, len + 1);
 248         if (dev == NULL) {
 249                 RTE_LOG(ERR, EAL, "not enough memory to parse device\n");
 250                 return -ENOMEM;
 251         }
 252
 253         va_start(ap, format);
 254         vsnprintf(dev, len + 1, format, ap);
 255         va_end(ap);
 256
 257         ret = rte_devargs_parse(da, dev);
 258
 259         free(dev);
 260         return ret;
 261 }
 262
 263 int
 264 rte_devargs_insert(struct rte_devargs **da)
 265 {
 266         struct rte_devargs *listed_da;
 267         void *tmp;
 268
 269         if (*da == NULL || (*da)->bus == NULL)
 270                 return -1;
 271
 272         TAILQ_FOREACH_SAFE(listed_da, &devargs_list, next, tmp) {
 273                 if (listed_da == *da)
 274                         /* devargs already in the list */
 275                         return 0;
 276                 if (strcmp(listed_da->bus->name, (*da)->bus->name) == 0 &&
 277                                 strcmp(listed_da->name, (*da)->name) == 0) {
 278                         /* device already in devargs list, must be updated */
 279                         listed_da->type = (*da)->type;
 280                         listed_da->policy = (*da)->policy;
 281                         free(listed_da->args);
 282                         listed_da->args = (*da)->args;
 283                         listed_da->bus = (*da)->bus;
 284                         listed_da->cls = (*da)->cls;
 285                         listed_da->bus_str = (*da)->bus_str;
 286                         listed_da->cls_str = (*da)->cls_str;
 287                         listed_da->data = (*da)->data;
 288                         /* replace provided devargs with found one */
 289                         free(*da);
 290                         *da = listed_da;
 291                         return 0;
 292                 }
 293         }
 294         /* new device in the list */
 295         TAILQ_INSERT_TAIL(&devargs_list, *da, next);
 296         return 0;
 297 }
 298
 299 /* store a whitelist parameter for later parsing */
 300 int
 301 rte_devargs_add(enum rte_devtype devtype, const char *devargs_str)
 302 {
 303         struct rte_devargs *devargs = NULL;
 304         struct rte_bus *bus = NULL;
 305         const char *dev = devargs_str;
 306
 307         /* use calloc instead of rte_zmalloc as it's called early at init */
 308         devargs = calloc(1, sizeof(*devargs));
 309         if (devargs == NULL)
 310                 goto fail;
 311
 312         if (rte_devargs_parse(devargs, dev))
 313                 goto fail;
 314         devargs->type = devtype;
 315         bus = devargs->bus;
 316         if (devargs->type == RTE_DEVTYPE_BLACKLISTED_PCI)
 317                 devargs->policy = RTE_DEV_BLACKLISTED;
 318         if (bus->conf.scan_mode == RTE_BUS_SCAN_UNDEFINED) {
 319                 if (devargs->policy == RTE_DEV_WHITELISTED)
 320                         bus->conf.scan_mode = RTE_BUS_SCAN_WHITELIST;
 321                 else if (devargs->policy == RTE_DEV_BLACKLISTED)
 322                         bus->conf.scan_mode = RTE_BUS_SCAN_BLACKLIST;
 323         }
 324         TAILQ_INSERT_TAIL(&devargs_list, devargs, next);
 325         return 0;
 326
 327 fail:
 328         if (devargs) {
 329                 free(devargs->args);
 330                 free(devargs);
 331         }
 332
 333         return -1;
 334 }
 335
 336 int
 337 rte_devargs_remove(struct rte_devargs *devargs)
 338 {
 339         struct rte_devargs *d;
 340         void *tmp;
 341
 342         if (devargs == NULL || devargs->bus == NULL)
 343                 return -1;
 344
 345         TAILQ_FOREACH_SAFE(d, &devargs_list, next, tmp) {
 346                 if (strcmp(d->bus->name, devargs->bus->name) == 0 &&
 347                     strcmp(d->name, devargs->name) == 0) {
 348                         TAILQ_REMOVE(&devargs_list, d, next);
 349                         free(d->args);
 350                         free(d);
 351                         return 0;
 352                 }
 353         }
 354         return 1;
 355 }
 356
 357 /* count the number of devices of a specified type */
 358 unsigned int
 359 rte_devargs_type_count(enum rte_devtype devtype)
 360 {
 361         struct rte_devargs *devargs;
 362         unsigned int count = 0;
 363
 364         TAILQ_FOREACH(devargs, &devargs_list, next) {
 365                 if (devargs->type != devtype)
 366                         continue;
 367                 count++;
 368         }
 369         return count;
 370 }
 371
 372 /* dump the user devices on the console */
 373 void
 374 rte_devargs_dump(FILE *f)
 375 {
 376         struct rte_devargs *devargs;
 377
 378         fprintf(f, "User device list:\n");
 379         TAILQ_FOREACH(devargs, &devargs_list, next) {
 380                 fprintf(f, "  [%s]: %s %s\n",
 381                         (devargs->bus ? devargs->bus->name : "??"),
 382                         devargs->name, devargs->args);
 383         }
 384 }
 385
 386 /* bus-aware rte_devargs iterator. */
 387 struct rte_devargs *
 388 rte_devargs_next(const char *busname, const struct rte_devargs *start)
 389 {
 390         struct rte_devargs *da;
 391
 392         if (start != NULL)
 393                 da = TAILQ_NEXT(start, next);
 394         else
 395                 da = TAILQ_FIRST(&devargs_list);
 396         while (da != NULL) {
 397                 if (busname == NULL ||
 398                     (strcmp(busname, da->bus->name) == 0))
 399                         return da;
 400                 da = TAILQ_NEXT(da, next);
 401         }
 402         return NULL;
 403 }