drivers/net/ring/rte_eth_ring.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2015 Intel Corporation
   3  */
   4
   5 #include "rte_eth_ring.h"
   6 #include <rte_mbuf.h>
   7 #include <rte_ethdev_driver.h>
   8 #include <rte_malloc.h>
   9 #include <rte_memcpy.h>
  10 #include <rte_string_fns.h>
  11 #include <rte_bus_vdev.h>
  12 #include <rte_kvargs.h>
  13 #include <rte_errno.h>
  14
  15 #define ETH_RING_NUMA_NODE_ACTION_ARG   "nodeaction"
  16 #define ETH_RING_ACTION_CREATE          "CREATE"
  17 #define ETH_RING_ACTION_ATTACH          "ATTACH"
  18 #define ETH_RING_INTERNAL_ARG           "internal"
  19
  20 static const char *valid_arguments[] = {
  21         ETH_RING_NUMA_NODE_ACTION_ARG,
  22         ETH_RING_INTERNAL_ARG,
  23         NULL
  24 };
  25
  26 struct ring_internal_args {
  27         struct rte_ring * const *rx_queues;
  28         const unsigned int nb_rx_queues;
  29         struct rte_ring * const *tx_queues;
  30         const unsigned int nb_tx_queues;
  31         const unsigned int numa_node;
  32         void *addr; /* self addr for sanity check */
  33 };
  34
  35 enum dev_action {
  36         DEV_CREATE,
  37         DEV_ATTACH
  38 };
  39
  40 struct ring_queue {
  41         struct rte_ring *rng;
  42         rte_atomic64_t rx_pkts;
  43         rte_atomic64_t tx_pkts;
  44 };
  45
  46 struct pmd_internals {
  47         unsigned int max_rx_queues;
  48         unsigned int max_tx_queues;
  49
  50         struct ring_queue rx_ring_queues[RTE_PMD_RING_MAX_RX_RINGS];
  51         struct ring_queue tx_ring_queues[RTE_PMD_RING_MAX_TX_RINGS];
  52
  53         struct rte_ether_addr address;
  54         enum dev_action action;
  55 };
  56
  57 static struct rte_eth_link pmd_link = {
  58         .link_speed = ETH_SPEED_NUM_10G,
  59         .link_duplex = ETH_LINK_FULL_DUPLEX,
  60         .link_status = ETH_LINK_DOWN,
  61         .link_autoneg = ETH_LINK_FIXED,
  62 };
  63
  64 static int eth_ring_logtype;
  65
  66 #define PMD_LOG(level, fmt, args...) \
  67         rte_log(RTE_LOG_ ## level, eth_ring_logtype, \
  68                 "%s(): " fmt "\n", __func__, ##args)
  69
  70 static uint16_t
  71 eth_ring_rx(void *q, struct rte_mbuf **bufs, uint16_t nb_bufs)
  72 {
  73         void **ptrs = (void *)&bufs[0];
  74         struct ring_queue *r = q;
  75         const uint16_t nb_rx = (uint16_t)rte_ring_dequeue_burst(r->rng,
  76                         ptrs, nb_bufs, NULL);
  77         if (r->rng->flags & RING_F_SC_DEQ)
  78                 r->rx_pkts.cnt += nb_rx;
  79         else
  80                 rte_atomic64_add(&(r->rx_pkts), nb_rx);
  81         return nb_rx;
  82 }
  83
  84 static uint16_t
  85 eth_ring_tx(void *q, struct rte_mbuf **bufs, uint16_t nb_bufs)
  86 {
  87         void **ptrs = (void *)&bufs[0];
  88         struct ring_queue *r = q;
  89         const uint16_t nb_tx = (uint16_t)rte_ring_enqueue_burst(r->rng,
  90                         ptrs, nb_bufs, NULL);
  91         if (r->rng->flags & RING_F_SP_ENQ)
  92                 r->tx_pkts.cnt += nb_tx;
  93         else
  94                 rte_atomic64_add(&(r->tx_pkts), nb_tx);
  95         return nb_tx;
  96 }
  97
  98 static int
  99 eth_dev_configure(struct rte_eth_dev *dev __rte_unused) { return 0; }
 100
 101 static int
 102 eth_dev_start(struct rte_eth_dev *dev)
 103 {
 104         dev->data->dev_link.link_status = ETH_LINK_UP;
 105         return 0;
 106 }
 107
 108 static void
 109 eth_dev_stop(struct rte_eth_dev *dev)
 110 {
 111         dev->data->dev_link.link_status = ETH_LINK_DOWN;
 112 }
 113
 114 static int
 115 eth_dev_set_link_down(struct rte_eth_dev *dev)
 116 {
 117         dev->data->dev_link.link_status = ETH_LINK_DOWN;
 118         return 0;
 119 }
 120
 121 static int
 122 eth_dev_set_link_up(struct rte_eth_dev *dev)
 123 {
 124         dev->data->dev_link.link_status = ETH_LINK_UP;
 125         return 0;
 126 }
 127
 128 static int
 129 eth_rx_queue_setup(struct rte_eth_dev *dev, uint16_t rx_queue_id,
 130                                     uint16_t nb_rx_desc __rte_unused,
 131                                     unsigned int socket_id __rte_unused,
 132                                     const struct rte_eth_rxconf *rx_conf __rte_unused,
 133                                     struct rte_mempool *mb_pool __rte_unused)
 134 {
 135         struct pmd_internals *internals = dev->data->dev_private;
 136
 137         dev->data->rx_queues[rx_queue_id] = &internals->rx_ring_queues[rx_queue_id];
 138         return 0;
 139 }
 140
 141 static int
 142 eth_tx_queue_setup(struct rte_eth_dev *dev, uint16_t tx_queue_id,
 143                                     uint16_t nb_tx_desc __rte_unused,
 144                                     unsigned int socket_id __rte_unused,
 145                                     const struct rte_eth_txconf *tx_conf __rte_unused)
 146 {
 147         struct pmd_internals *internals = dev->data->dev_private;
 148
 149         dev->data->tx_queues[tx_queue_id] = &internals->tx_ring_queues[tx_queue_id];
 150         return 0;
 151 }
 152
 153
 154 static void
 155 eth_dev_info(struct rte_eth_dev *dev,
 156              struct rte_eth_dev_info *dev_info)
 157 {
 158         struct pmd_internals *internals = dev->data->dev_private;
 159
 160         dev_info->max_mac_addrs = 1;
 161         dev_info->max_rx_pktlen = (uint32_t)-1;
 162         dev_info->max_rx_queues = (uint16_t)internals->max_rx_queues;
 163         dev_info->max_tx_queues = (uint16_t)internals->max_tx_queues;
 164         dev_info->min_rx_bufsize = 0;
 165 }
 166
 167 static int
 168 eth_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *stats)
 169 {
 170         unsigned int i;
 171         unsigned long rx_total = 0, tx_total = 0;
 172         const struct pmd_internals *internal = dev->data->dev_private;
 173
 174         for (i = 0; i < RTE_ETHDEV_QUEUE_STAT_CNTRS &&
 175                         i < dev->data->nb_rx_queues; i++) {
 176                 stats->q_ipackets[i] = internal->rx_ring_queues[i].rx_pkts.cnt;
 177                 rx_total += stats->q_ipackets[i];
 178         }
 179
 180         for (i = 0; i < RTE_ETHDEV_QUEUE_STAT_CNTRS &&
 181                         i < dev->data->nb_tx_queues; i++) {
 182                 stats->q_opackets[i] = internal->tx_ring_queues[i].tx_pkts.cnt;
 183                 tx_total += stats->q_opackets[i];
 184         }
 185
 186         stats->ipackets = rx_total;
 187         stats->opackets = tx_total;
 188
 189         return 0;
 190 }
 191
 192 static void
 193 eth_stats_reset(struct rte_eth_dev *dev)
 194 {
 195         unsigned int i;
 196         struct pmd_internals *internal = dev->data->dev_private;
 197
 198         for (i = 0; i < dev->data->nb_rx_queues; i++)
 199                 internal->rx_ring_queues[i].rx_pkts.cnt = 0;
 200         for (i = 0; i < dev->data->nb_tx_queues; i++)
 201                 internal->tx_ring_queues[i].tx_pkts.cnt = 0;
 202 }
 203
 204 static void
 205 eth_mac_addr_remove(struct rte_eth_dev *dev __rte_unused,
 206         uint32_t index __rte_unused)
 207 {
 208 }
 209
 210 static int
 211 eth_mac_addr_add(struct rte_eth_dev *dev __rte_unused,
 212         struct rte_ether_addr *mac_addr __rte_unused,
 213         uint32_t index __rte_unused,
 214         uint32_t vmdq __rte_unused)
 215 {
 216         return 0;
 217 }
 218
 219 static void
 220 eth_queue_release(void *q __rte_unused) { ; }
 221 static int
 222 eth_link_update(struct rte_eth_dev *dev __rte_unused,
 223                 int wait_to_complete __rte_unused) { return 0; }
 224
 225 static const struct eth_dev_ops ops = {
 226         .dev_start = eth_dev_start,
 227         .dev_stop = eth_dev_stop,
 228         .dev_set_link_up = eth_dev_set_link_up,
 229         .dev_set_link_down = eth_dev_set_link_down,
 230         .dev_configure = eth_dev_configure,
 231         .dev_infos_get = eth_dev_info,
 232         .rx_queue_setup = eth_rx_queue_setup,
 233         .tx_queue_setup = eth_tx_queue_setup,
 234         .rx_queue_release = eth_queue_release,
 235         .tx_queue_release = eth_queue_release,
 236         .link_update = eth_link_update,
 237         .stats_get = eth_stats_get,
 238         .stats_reset = eth_stats_reset,
 239         .mac_addr_remove = eth_mac_addr_remove,
 240         .mac_addr_add = eth_mac_addr_add,
 241 };
 242
 243 static int
 244 do_eth_dev_ring_create(const char *name,
 245                 struct rte_ring * const rx_queues[],
 246                 const unsigned int nb_rx_queues,
 247                 struct rte_ring *const tx_queues[],
 248                 const unsigned int nb_tx_queues,
 249                 const unsigned int numa_node, enum dev_action action,
 250                 struct rte_eth_dev **eth_dev_p)
 251 {
 252         struct rte_eth_dev_data *data = NULL;
 253         struct pmd_internals *internals = NULL;
 254         struct rte_eth_dev *eth_dev = NULL;
 255         void **rx_queues_local = NULL;
 256         void **tx_queues_local = NULL;
 257         unsigned int i;
 258
 259         PMD_LOG(INFO, "Creating rings-backed ethdev on numa socket %u",
 260                         numa_node);
 261
 262         rx_queues_local = rte_calloc_socket(name, nb_rx_queues,
 263                                             sizeof(void *), 0, numa_node);
 264         if (rx_queues_local == NULL) {
 265                 rte_errno = ENOMEM;
 266                 goto error;
 267         }
 268
 269         tx_queues_local = rte_calloc_socket(name, nb_tx_queues,
 270                                             sizeof(void *), 0, numa_node);
 271         if (tx_queues_local == NULL) {
 272                 rte_errno = ENOMEM;
 273                 goto error;
 274         }
 275
 276         internals = rte_zmalloc_socket(name, sizeof(*internals), 0, numa_node);
 277         if (internals == NULL) {
 278                 rte_errno = ENOMEM;
 279                 goto error;
 280         }
 281
 282         /* reserve an ethdev entry */
 283         eth_dev = rte_eth_dev_allocate(name);
 284         if (eth_dev == NULL) {
 285                 rte_errno = ENOSPC;
 286                 goto error;
 287         }
 288
 289         /* now put it all together
 290          * - store queue data in internals,
 291          * - store numa_node info in eth_dev_data
 292          * - point eth_dev_data to internals
 293          * - and point eth_dev structure to new eth_dev_data structure
 294          */
 295
 296         data = eth_dev->data;
 297         data->rx_queues = rx_queues_local;
 298         data->tx_queues = tx_queues_local;
 299
 300         internals->action = action;
 301         internals->max_rx_queues = nb_rx_queues;
 302         internals->max_tx_queues = nb_tx_queues;
 303         for (i = 0; i < nb_rx_queues; i++) {
 304                 internals->rx_ring_queues[i].rng = rx_queues[i];
 305                 data->rx_queues[i] = &internals->rx_ring_queues[i];
 306         }
 307         for (i = 0; i < nb_tx_queues; i++) {
 308                 internals->tx_ring_queues[i].rng = tx_queues[i];
 309                 data->tx_queues[i] = &internals->tx_ring_queues[i];
 310         }
 311
 312         data->dev_private = internals;
 313         data->nb_rx_queues = (uint16_t)nb_rx_queues;
 314         data->nb_tx_queues = (uint16_t)nb_tx_queues;
 315         data->dev_link = pmd_link;
 316         data->mac_addrs = &internals->address;
 317
 318         eth_dev->dev_ops = &ops;
 319         data->kdrv = RTE_KDRV_NONE;
 320         data->numa_node = numa_node;
 321
 322         /* finally assign rx and tx ops */
 323         eth_dev->rx_pkt_burst = eth_ring_rx;
 324         eth_dev->tx_pkt_burst = eth_ring_tx;
 325
 326         rte_eth_dev_probing_finish(eth_dev);
 327         *eth_dev_p = eth_dev;
 328
 329         return data->port_id;
 330
 331 error:
 332         rte_free(rx_queues_local);
 333         rte_free(tx_queues_local);
 334         rte_free(internals);
 335
 336         return -1;
 337 }
 338
 339 int
 340 rte_eth_from_rings(const char *name, struct rte_ring *const rx_queues[],
 341                 const unsigned int nb_rx_queues,
 342                 struct rte_ring *const tx_queues[],
 343                 const unsigned int nb_tx_queues,
 344                 const unsigned int numa_node)
 345 {
 346         struct ring_internal_args args = {
 347                 .rx_queues = rx_queues,
 348                 .nb_rx_queues = nb_rx_queues,
 349                 .tx_queues = tx_queues,
 350                 .nb_tx_queues = nb_tx_queues,
 351                 .numa_node = numa_node,
 352                 .addr = &args,
 353         };
 354         char args_str[32];
 355         char ring_name[RTE_RING_NAMESIZE];
 356         uint16_t port_id = RTE_MAX_ETHPORTS;
 357         int ret;
 358
 359         /* do some parameter checking */
 360         if (rx_queues == NULL && nb_rx_queues > 0) {
 361                 rte_errno = EINVAL;
 362                 return -1;
 363         }
 364         if (tx_queues == NULL && nb_tx_queues > 0) {
 365                 rte_errno = EINVAL;
 366                 return -1;
 367         }
 368         if (nb_rx_queues > RTE_PMD_RING_MAX_RX_RINGS) {
 369                 rte_errno = EINVAL;
 370                 return -1;
 371         }
 372
 373         snprintf(args_str, sizeof(args_str), "%s=%p",
 374                  ETH_RING_INTERNAL_ARG, &args);
 375
 376         ret = snprintf(ring_name, sizeof(ring_name), "net_ring_%s", name);
 377         if (ret >= (int)sizeof(ring_name)) {
 378                 rte_errno = ENAMETOOLONG;
 379                 return -1;
 380         }
 381
 382         ret = rte_vdev_init(ring_name, args_str);
 383         if (ret) {
 384                 rte_errno = EINVAL;
 385                 return -1;
 386         }
 387
 388         ret = rte_eth_dev_get_port_by_name(ring_name, &port_id);
 389         if (ret) {
 390                 rte_errno = ENODEV;
 391                 return -1;
 392         }
 393
 394         return port_id;
 395 }
 396
 397 int
 398 rte_eth_from_ring(struct rte_ring *r)
 399 {
 400         return rte_eth_from_rings(r->name, &r, 1, &r, 1,
 401                         r->memzone ? r->memzone->socket_id : SOCKET_ID_ANY);
 402 }
 403
 404 static int
 405 eth_dev_ring_create(const char *name, const unsigned int numa_node,
 406                 enum dev_action action, struct rte_eth_dev **eth_dev)
 407 {
 408         /* rx and tx are so-called from point of view of first port.
 409          * They are inverted from the point of view of second port
 410          */
 411         struct rte_ring *rxtx[RTE_PMD_RING_MAX_RX_RINGS];
 412         unsigned int i;
 413         char rng_name[RTE_RING_NAMESIZE];
 414         unsigned int num_rings = RTE_MIN(RTE_PMD_RING_MAX_RX_RINGS,
 415                         RTE_PMD_RING_MAX_TX_RINGS);
 416
 417         for (i = 0; i < num_rings; i++) {
 418                 int cc;
 419
 420                 cc = snprintf(rng_name, sizeof(rng_name),
 421                               "ETH_RXTX%u_%s", i, name);
 422                 if (cc >= (int)sizeof(rng_name)) {
 423                         rte_errno = ENAMETOOLONG;
 424                         return -1;
 425                 }
 426
 427                 rxtx[i] = (action == DEV_CREATE) ?
 428                                 rte_ring_create(rng_name, 1024, numa_node,
 429                                                 RING_F_SP_ENQ|RING_F_SC_DEQ) :
 430                                 rte_ring_lookup(rng_name);
 431                 if (rxtx[i] == NULL)
 432                         return -1;
 433         }
 434
 435         if (do_eth_dev_ring_create(name, rxtx, num_rings, rxtx, num_rings,
 436                 numa_node, action, eth_dev) < 0)
 437                 return -1;
 438
 439         return 0;
 440 }
 441
 442 struct node_action_pair {
 443         char name[PATH_MAX];
 444         unsigned int node;
 445         enum dev_action action;
 446 };
 447
 448 struct node_action_list {
 449         unsigned int total;
 450         unsigned int count;
 451         struct node_action_pair *list;
 452 };
 453
 454 static int parse_kvlist(const char *key __rte_unused,
 455                         const char *value, void *data)
 456 {
 457         struct node_action_list *info = data;
 458         int ret;
 459         char *name;
 460         char *action;
 461         char *node;
 462         char *end;
 463
 464         name = strdup(value);
 465
 466         ret = -EINVAL;
 467
 468         if (!name) {
 469                 PMD_LOG(WARNING, "command line parameter is empty for ring pmd!");
 470                 goto out;
 471         }
 472
 473         node = strchr(name, ':');
 474         if (!node) {
 475                 PMD_LOG(WARNING, "could not parse node value from %s",
 476                         name);
 477                 goto out;
 478         }
 479
 480         *node = '\0';
 481         node++;
 482
 483         action = strchr(node, ':');
 484         if (!action) {
 485                 PMD_LOG(WARNING, "could not parse action value from %s",
 486                         node);
 487                 goto out;
 488         }
 489
 490         *action = '\0';
 491         action++;
 492
 493         /*
 494          * Need to do some sanity checking here
 495          */
 496
 497         if (strcmp(action, ETH_RING_ACTION_ATTACH) == 0)
 498                 info->list[info->count].action = DEV_ATTACH;
 499         else if (strcmp(action, ETH_RING_ACTION_CREATE) == 0)
 500                 info->list[info->count].action = DEV_CREATE;
 501         else
 502                 goto out;
 503
 504         errno = 0;
 505         info->list[info->count].node = strtol(node, &end, 10);
 506
 507         if ((errno != 0) || (*end != '\0')) {
 508                 PMD_LOG(WARNING,
 509                         "node value %s is unparseable as a number", node);
 510                 goto out;
 511         }
 512
 513         strlcpy(info->list[info->count].name, name,
 514                 sizeof(info->list[info->count].name));
 515
 516         info->count++;
 517
 518         ret = 0;
 519 out:
 520         free(name);
 521         return ret;
 522 }
 523
 524 static int
 525 parse_internal_args(const char *key __rte_unused, const char *value,
 526                 void *data)
 527 {
 528         struct ring_internal_args **internal_args = data;
 529         void *args;
 530
 531         sscanf(value, "%p", &args);
 532
 533         *internal_args = args;
 534
 535         if ((*internal_args)->addr != args)
 536                 return -1;
 537
 538         return 0;
 539 }
 540
 541 static int
 542 rte_pmd_ring_probe(struct rte_vdev_device *dev)
 543 {
 544         const char *name, *params;
 545         struct rte_kvargs *kvlist = NULL;
 546         int ret = 0;
 547         struct node_action_list *info = NULL;
 548         struct rte_eth_dev *eth_dev = NULL;
 549         struct ring_internal_args *internal_args;
 550
 551         name = rte_vdev_device_name(dev);
 552         params = rte_vdev_device_args(dev);
 553
 554         PMD_LOG(INFO, "Initializing pmd_ring for %s", name);
 555
 556         if (params == NULL || params[0] == '\0') {
 557                 ret = eth_dev_ring_create(name, rte_socket_id(), DEV_CREATE,
 558                                 &eth_dev);
 559                 if (ret == -1) {
 560                         PMD_LOG(INFO,
 561                                 "Attach to pmd_ring for %s", name);
 562                         ret = eth_dev_ring_create(name, rte_socket_id(),
 563                                                   DEV_ATTACH, &eth_dev);
 564                 }
 565         } else {
 566                 kvlist = rte_kvargs_parse(params, valid_arguments);
 567
 568                 if (!kvlist) {
 569                         PMD_LOG(INFO,
 570                                 "Ignoring unsupported parameters when creatingrings-backed ethernet device");
 571                         ret = eth_dev_ring_create(name, rte_socket_id(),
 572                                                   DEV_CREATE, &eth_dev);
 573                         if (ret == -1) {
 574                                 PMD_LOG(INFO,
 575                                         "Attach to pmd_ring for %s",
 576                                         name);
 577                                 ret = eth_dev_ring_create(name, rte_socket_id(),
 578                                                           DEV_ATTACH, &eth_dev);
 579                         }
 580
 581                         if (eth_dev)
 582                                 eth_dev->device = &dev->device;
 583
 584                         return ret;
 585                 }
 586
 587                 if (rte_kvargs_count(kvlist, ETH_RING_INTERNAL_ARG) == 1) {
 588                         ret = rte_kvargs_process(kvlist, ETH_RING_INTERNAL_ARG,
 589                                                  parse_internal_args,
 590                                                  &internal_args);
 591                         if (ret < 0)
 592                                 goto out_free;
 593
 594                         ret = do_eth_dev_ring_create(name,
 595                                 internal_args->rx_queues,
 596                                 internal_args->nb_rx_queues,
 597                                 internal_args->tx_queues,
 598                                 internal_args->nb_tx_queues,
 599                                 internal_args->numa_node,
 600                                 DEV_ATTACH,
 601                                 &eth_dev);
 602                         if (ret >= 0)
 603                                 ret = 0;
 604                 } else {
 605                         ret = rte_kvargs_count(kvlist, ETH_RING_NUMA_NODE_ACTION_ARG);
 606                         info = rte_zmalloc("struct node_action_list",
 607                                            sizeof(struct node_action_list) +
 608                                            (sizeof(struct node_action_pair) * ret),
 609                                            0);
 610                         if (!info)
 611                                 goto out_free;
 612
 613                         info->total = ret;
 614                         info->list = (struct node_action_pair *)(info + 1);
 615
 616                         ret = rte_kvargs_process(kvlist, ETH_RING_NUMA_NODE_ACTION_ARG,
 617                                                  parse_kvlist, info);
 618
 619                         if (ret < 0)
 620                                 goto out_free;
 621
 622                         for (info->count = 0; info->count < info->total; info->count++) {
 623                                 ret = eth_dev_ring_create(info->list[info->count].name,
 624                                                           info->list[info->count].node,
 625                                                           info->list[info->count].action,
 626                                                           &eth_dev);
 627                                 if ((ret == -1) &&
 628                                     (info->list[info->count].action == DEV_CREATE)) {
 629                                         PMD_LOG(INFO,
 630                                                 "Attach to pmd_ring for %s",
 631                                                 name);
 632                                         ret = eth_dev_ring_create(name,
 633                                                         info->list[info->count].node,
 634                                                         DEV_ATTACH,
 635                                                         &eth_dev);
 636                                 }
 637                         }
 638                 }
 639         }
 640
 641         if (eth_dev)
 642                 eth_dev->device = &dev->device;
 643
 644 out_free:
 645         rte_kvargs_free(kvlist);
 646         rte_free(info);
 647         return ret;
 648 }
 649
 650 static int
 651 rte_pmd_ring_remove(struct rte_vdev_device *dev)
 652 {
 653         const char *name = rte_vdev_device_name(dev);
 654         struct rte_eth_dev *eth_dev = NULL;
 655         struct pmd_internals *internals = NULL;
 656         struct ring_queue *r = NULL;
 657         uint16_t i;
 658
 659         PMD_LOG(INFO, "Un-Initializing pmd_ring for %s", name);
 660
 661         if (name == NULL)
 662                 return -EINVAL;
 663
 664         /* find an ethdev entry */
 665         eth_dev = rte_eth_dev_allocated(name);
 666         if (eth_dev == NULL)
 667                 return -ENODEV;
 668
 669         eth_dev_stop(eth_dev);
 670
 671         internals = eth_dev->data->dev_private;
 672         if (internals->action == DEV_CREATE) {
 673                 /*
 674                  * it is only necessary to delete the rings in rx_queues because
 675                  * they are the same used in tx_queues
 676                  */
 677                 for (i = 0; i < eth_dev->data->nb_rx_queues; i++) {
 678                         r = eth_dev->data->rx_queues[i];
 679                         rte_ring_free(r->rng);
 680                 }
 681         }
 682
 683         /* mac_addrs must not be freed alone because part of dev_private */
 684         eth_dev->data->mac_addrs = NULL;
 685         rte_eth_dev_release_port(eth_dev);
 686         return 0;
 687 }
 688
 689 static struct rte_vdev_driver pmd_ring_drv = {
 690         .probe = rte_pmd_ring_probe,
 691         .remove = rte_pmd_ring_remove,
 692 };
 693
 694 RTE_PMD_REGISTER_VDEV(net_ring, pmd_ring_drv);
 695 RTE_PMD_REGISTER_ALIAS(net_ring, eth_ring);
 696 RTE_PMD_REGISTER_PARAM_STRING(net_ring,
 697         ETH_RING_NUMA_NODE_ACTION_ARG "=name:node:action(ATTACH|CREATE)");
 698
 699 RTE_INIT(eth_ring_init_log)
 700 {
 701         eth_ring_logtype = rte_log_register("pmd.net.ring");
 702         if (eth_ring_logtype >= 0)
 703                 rte_log_set_level(eth_ring_logtype, RTE_LOG_NOTICE);
 704 }