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 int
 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         return 0;
 167 }
 168
 169 static int
 170 eth_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *stats)
 171 {
 172         unsigned int i;
 173         unsigned long rx_total = 0, tx_total = 0;
 174         const struct pmd_internals *internal = dev->data->dev_private;
 175
 176         for (i = 0; i < RTE_ETHDEV_QUEUE_STAT_CNTRS &&
 177                         i < dev->data->nb_rx_queues; i++) {
 178                 stats->q_ipackets[i] = internal->rx_ring_queues[i].rx_pkts.cnt;
 179                 rx_total += stats->q_ipackets[i];
 180         }
 181
 182         for (i = 0; i < RTE_ETHDEV_QUEUE_STAT_CNTRS &&
 183                         i < dev->data->nb_tx_queues; i++) {
 184                 stats->q_opackets[i] = internal->tx_ring_queues[i].tx_pkts.cnt;
 185                 tx_total += stats->q_opackets[i];
 186         }
 187
 188         stats->ipackets = rx_total;
 189         stats->opackets = tx_total;
 190
 191         return 0;
 192 }
 193
 194 static void
 195 eth_stats_reset(struct rte_eth_dev *dev)
 196 {
 197         unsigned int i;
 198         struct pmd_internals *internal = dev->data->dev_private;
 199
 200         for (i = 0; i < dev->data->nb_rx_queues; i++)
 201                 internal->rx_ring_queues[i].rx_pkts.cnt = 0;
 202         for (i = 0; i < dev->data->nb_tx_queues; i++)
 203                 internal->tx_ring_queues[i].tx_pkts.cnt = 0;
 204 }
 205
 206 static void
 207 eth_mac_addr_remove(struct rte_eth_dev *dev __rte_unused,
 208         uint32_t index __rte_unused)
 209 {
 210 }
 211
 212 static int
 213 eth_mac_addr_add(struct rte_eth_dev *dev __rte_unused,
 214         struct rte_ether_addr *mac_addr __rte_unused,
 215         uint32_t index __rte_unused,
 216         uint32_t vmdq __rte_unused)
 217 {
 218         return 0;
 219 }
 220
 221 static void
 222 eth_queue_release(void *q __rte_unused) { ; }
 223 static int
 224 eth_link_update(struct rte_eth_dev *dev __rte_unused,
 225                 int wait_to_complete __rte_unused) { return 0; }
 226
 227 static const struct eth_dev_ops ops = {
 228         .dev_start = eth_dev_start,
 229         .dev_stop = eth_dev_stop,
 230         .dev_set_link_up = eth_dev_set_link_up,
 231         .dev_set_link_down = eth_dev_set_link_down,
 232         .dev_configure = eth_dev_configure,
 233         .dev_infos_get = eth_dev_info,
 234         .rx_queue_setup = eth_rx_queue_setup,
 235         .tx_queue_setup = eth_tx_queue_setup,
 236         .rx_queue_release = eth_queue_release,
 237         .tx_queue_release = eth_queue_release,
 238         .link_update = eth_link_update,
 239         .stats_get = eth_stats_get,
 240         .stats_reset = eth_stats_reset,
 241         .mac_addr_remove = eth_mac_addr_remove,
 242         .mac_addr_add = eth_mac_addr_add,
 243 };
 244
 245 static int
 246 do_eth_dev_ring_create(const char *name,
 247                 struct rte_ring * const rx_queues[],
 248                 const unsigned int nb_rx_queues,
 249                 struct rte_ring *const tx_queues[],
 250                 const unsigned int nb_tx_queues,
 251                 const unsigned int numa_node, enum dev_action action,
 252                 struct rte_eth_dev **eth_dev_p)
 253 {
 254         struct rte_eth_dev_data *data = NULL;
 255         struct pmd_internals *internals = NULL;
 256         struct rte_eth_dev *eth_dev = NULL;
 257         void **rx_queues_local = NULL;
 258         void **tx_queues_local = NULL;
 259         unsigned int i;
 260
 261         PMD_LOG(INFO, "Creating rings-backed ethdev on numa socket %u",
 262                         numa_node);
 263
 264         rx_queues_local = rte_calloc_socket(name, nb_rx_queues,
 265                                             sizeof(void *), 0, numa_node);
 266         if (rx_queues_local == NULL) {
 267                 rte_errno = ENOMEM;
 268                 goto error;
 269         }
 270
 271         tx_queues_local = rte_calloc_socket(name, nb_tx_queues,
 272                                             sizeof(void *), 0, numa_node);
 273         if (tx_queues_local == NULL) {
 274                 rte_errno = ENOMEM;
 275                 goto error;
 276         }
 277
 278         internals = rte_zmalloc_socket(name, sizeof(*internals), 0, numa_node);
 279         if (internals == NULL) {
 280                 rte_errno = ENOMEM;
 281                 goto error;
 282         }
 283
 284         /* reserve an ethdev entry */
 285         eth_dev = rte_eth_dev_allocate(name);
 286         if (eth_dev == NULL) {
 287                 rte_errno = ENOSPC;
 288                 goto error;
 289         }
 290
 291         /* now put it all together
 292          * - store queue data in internals,
 293          * - store numa_node info in eth_dev_data
 294          * - point eth_dev_data to internals
 295          * - and point eth_dev structure to new eth_dev_data structure
 296          */
 297
 298         data = eth_dev->data;
 299         data->rx_queues = rx_queues_local;
 300         data->tx_queues = tx_queues_local;
 301
 302         internals->action = action;
 303         internals->max_rx_queues = nb_rx_queues;
 304         internals->max_tx_queues = nb_tx_queues;
 305         for (i = 0; i < nb_rx_queues; i++) {
 306                 internals->rx_ring_queues[i].rng = rx_queues[i];
 307                 data->rx_queues[i] = &internals->rx_ring_queues[i];
 308         }
 309         for (i = 0; i < nb_tx_queues; i++) {
 310                 internals->tx_ring_queues[i].rng = tx_queues[i];
 311                 data->tx_queues[i] = &internals->tx_ring_queues[i];
 312         }
 313
 314         data->dev_private = internals;
 315         data->nb_rx_queues = (uint16_t)nb_rx_queues;
 316         data->nb_tx_queues = (uint16_t)nb_tx_queues;
 317         data->dev_link = pmd_link;
 318         data->mac_addrs = &internals->address;
 319
 320         eth_dev->dev_ops = &ops;
 321         data->kdrv = RTE_KDRV_NONE;
 322         data->numa_node = numa_node;
 323
 324         /* finally assign rx and tx ops */
 325         eth_dev->rx_pkt_burst = eth_ring_rx;
 326         eth_dev->tx_pkt_burst = eth_ring_tx;
 327
 328         rte_eth_dev_probing_finish(eth_dev);
 329         *eth_dev_p = eth_dev;
 330
 331         return data->port_id;
 332
 333 error:
 334         rte_free(rx_queues_local);
 335         rte_free(tx_queues_local);
 336         rte_free(internals);
 337
 338         return -1;
 339 }
 340
 341 int
 342 rte_eth_from_rings(const char *name, struct rte_ring *const rx_queues[],
 343                 const unsigned int nb_rx_queues,
 344                 struct rte_ring *const tx_queues[],
 345                 const unsigned int nb_tx_queues,
 346                 const unsigned int numa_node)
 347 {
 348         struct ring_internal_args args = {
 349                 .rx_queues = rx_queues,
 350                 .nb_rx_queues = nb_rx_queues,
 351                 .tx_queues = tx_queues,
 352                 .nb_tx_queues = nb_tx_queues,
 353                 .numa_node = numa_node,
 354                 .addr = &args,
 355         };
 356         char args_str[32];
 357         char ring_name[RTE_RING_NAMESIZE];
 358         uint16_t port_id = RTE_MAX_ETHPORTS;
 359         int ret;
 360
 361         /* do some parameter checking */
 362         if (rx_queues == NULL && nb_rx_queues > 0) {
 363                 rte_errno = EINVAL;
 364                 return -1;
 365         }
 366         if (tx_queues == NULL && nb_tx_queues > 0) {
 367                 rte_errno = EINVAL;
 368                 return -1;
 369         }
 370         if (nb_rx_queues > RTE_PMD_RING_MAX_RX_RINGS) {
 371                 rte_errno = EINVAL;
 372                 return -1;
 373         }
 374
 375         snprintf(args_str, sizeof(args_str), "%s=%p",
 376                  ETH_RING_INTERNAL_ARG, &args);
 377
 378         ret = snprintf(ring_name, sizeof(ring_name), "net_ring_%s", name);
 379         if (ret >= (int)sizeof(ring_name)) {
 380                 rte_errno = ENAMETOOLONG;
 381                 return -1;
 382         }
 383
 384         ret = rte_vdev_init(ring_name, args_str);
 385         if (ret) {
 386                 rte_errno = EINVAL;
 387                 return -1;
 388         }
 389
 390         ret = rte_eth_dev_get_port_by_name(ring_name, &port_id);
 391         if (ret) {
 392                 rte_errno = ENODEV;
 393                 return -1;
 394         }
 395
 396         return port_id;
 397 }
 398
 399 int
 400 rte_eth_from_ring(struct rte_ring *r)
 401 {
 402         return rte_eth_from_rings(r->name, &r, 1, &r, 1,
 403                         r->memzone ? r->memzone->socket_id : SOCKET_ID_ANY);
 404 }
 405
 406 static int
 407 eth_dev_ring_create(const char *name, const unsigned int numa_node,
 408                 enum dev_action action, struct rte_eth_dev **eth_dev)
 409 {
 410         /* rx and tx are so-called from point of view of first port.
 411          * They are inverted from the point of view of second port
 412          */
 413         struct rte_ring *rxtx[RTE_PMD_RING_MAX_RX_RINGS];
 414         unsigned int i;
 415         char rng_name[RTE_RING_NAMESIZE];
 416         unsigned int num_rings = RTE_MIN(RTE_PMD_RING_MAX_RX_RINGS,
 417                         RTE_PMD_RING_MAX_TX_RINGS);
 418
 419         for (i = 0; i < num_rings; i++) {
 420                 int cc;
 421
 422                 cc = snprintf(rng_name, sizeof(rng_name),
 423                               "ETH_RXTX%u_%s", i, name);
 424                 if (cc >= (int)sizeof(rng_name)) {
 425                         rte_errno = ENAMETOOLONG;
 426                         return -1;
 427                 }
 428
 429                 rxtx[i] = (action == DEV_CREATE) ?
 430                                 rte_ring_create(rng_name, 1024, numa_node,
 431                                                 RING_F_SP_ENQ|RING_F_SC_DEQ) :
 432                                 rte_ring_lookup(rng_name);
 433                 if (rxtx[i] == NULL)
 434                         return -1;
 435         }
 436
 437         if (do_eth_dev_ring_create(name, rxtx, num_rings, rxtx, num_rings,
 438                 numa_node, action, eth_dev) < 0)
 439                 return -1;
 440
 441         return 0;
 442 }
 443
 444 struct node_action_pair {
 445         char name[PATH_MAX];
 446         unsigned int node;
 447         enum dev_action action;
 448 };
 449
 450 struct node_action_list {
 451         unsigned int total;
 452         unsigned int count;
 453         struct node_action_pair *list;
 454 };
 455
 456 static int parse_kvlist(const char *key __rte_unused,
 457                         const char *value, void *data)
 458 {
 459         struct node_action_list *info = data;
 460         int ret;
 461         char *name;
 462         char *action;
 463         char *node;
 464         char *end;
 465
 466         name = strdup(value);
 467
 468         ret = -EINVAL;
 469
 470         if (!name) {
 471                 PMD_LOG(WARNING, "command line parameter is empty for ring pmd!");
 472                 goto out;
 473         }
 474
 475         node = strchr(name, ':');
 476         if (!node) {
 477                 PMD_LOG(WARNING, "could not parse node value from %s",
 478                         name);
 479                 goto out;
 480         }
 481
 482         *node = '\0';
 483         node++;
 484
 485         action = strchr(node, ':');
 486         if (!action) {
 487                 PMD_LOG(WARNING, "could not parse action value from %s",
 488                         node);
 489                 goto out;
 490         }
 491
 492         *action = '\0';
 493         action++;
 494
 495         /*
 496          * Need to do some sanity checking here
 497          */
 498
 499         if (strcmp(action, ETH_RING_ACTION_ATTACH) == 0)
 500                 info->list[info->count].action = DEV_ATTACH;
 501         else if (strcmp(action, ETH_RING_ACTION_CREATE) == 0)
 502                 info->list[info->count].action = DEV_CREATE;
 503         else
 504                 goto out;
 505
 506         errno = 0;
 507         info->list[info->count].node = strtol(node, &end, 10);
 508
 509         if ((errno != 0) || (*end != '\0')) {
 510                 PMD_LOG(WARNING,
 511                         "node value %s is unparseable as a number", node);
 512                 goto out;
 513         }
 514
 515         strlcpy(info->list[info->count].name, name,
 516                 sizeof(info->list[info->count].name));
 517
 518         info->count++;
 519
 520         ret = 0;
 521 out:
 522         free(name);
 523         return ret;
 524 }
 525
 526 static int
 527 parse_internal_args(const char *key __rte_unused, const char *value,
 528                 void *data)
 529 {
 530         struct ring_internal_args **internal_args = data;
 531         void *args;
 532
 533         sscanf(value, "%p", &args);
 534
 535         *internal_args = args;
 536
 537         if ((*internal_args)->addr != args)
 538                 return -1;
 539
 540         return 0;
 541 }
 542
 543 static int
 544 rte_pmd_ring_probe(struct rte_vdev_device *dev)
 545 {
 546         const char *name, *params;
 547         struct rte_kvargs *kvlist = NULL;
 548         int ret = 0;
 549         struct node_action_list *info = NULL;
 550         struct rte_eth_dev *eth_dev = NULL;
 551         struct ring_internal_args *internal_args;
 552
 553         name = rte_vdev_device_name(dev);
 554         params = rte_vdev_device_args(dev);
 555
 556         PMD_LOG(INFO, "Initializing pmd_ring for %s", name);
 557
 558         if (params == NULL || params[0] == '\0') {
 559                 ret = eth_dev_ring_create(name, rte_socket_id(), DEV_CREATE,
 560                                 &eth_dev);
 561                 if (ret == -1) {
 562                         PMD_LOG(INFO,
 563                                 "Attach to pmd_ring for %s", name);
 564                         ret = eth_dev_ring_create(name, rte_socket_id(),
 565                                                   DEV_ATTACH, &eth_dev);
 566                 }
 567         } else {
 568                 kvlist = rte_kvargs_parse(params, valid_arguments);
 569
 570                 if (!kvlist) {
 571                         PMD_LOG(INFO,
 572                                 "Ignoring unsupported parameters when creatingrings-backed ethernet device");
 573                         ret = eth_dev_ring_create(name, rte_socket_id(),
 574                                                   DEV_CREATE, &eth_dev);
 575                         if (ret == -1) {
 576                                 PMD_LOG(INFO,
 577                                         "Attach to pmd_ring for %s",
 578                                         name);
 579                                 ret = eth_dev_ring_create(name, rte_socket_id(),
 580                                                           DEV_ATTACH, &eth_dev);
 581                         }
 582
 583                         if (eth_dev)
 584                                 eth_dev->device = &dev->device;
 585
 586                         return ret;
 587                 }
 588
 589                 if (rte_kvargs_count(kvlist, ETH_RING_INTERNAL_ARG) == 1) {
 590                         ret = rte_kvargs_process(kvlist, ETH_RING_INTERNAL_ARG,
 591                                                  parse_internal_args,
 592                                                  &internal_args);
 593                         if (ret < 0)
 594                                 goto out_free;
 595
 596                         ret = do_eth_dev_ring_create(name,
 597                                 internal_args->rx_queues,
 598                                 internal_args->nb_rx_queues,
 599                                 internal_args->tx_queues,
 600                                 internal_args->nb_tx_queues,
 601                                 internal_args->numa_node,
 602                                 DEV_ATTACH,
 603                                 &eth_dev);
 604                         if (ret >= 0)
 605                                 ret = 0;
 606                 } else {
 607                         ret = rte_kvargs_count(kvlist, ETH_RING_NUMA_NODE_ACTION_ARG);
 608                         info = rte_zmalloc("struct node_action_list",
 609                                            sizeof(struct node_action_list) +
 610                                            (sizeof(struct node_action_pair) * ret),
 611                                            0);
 612                         if (!info)
 613                                 goto out_free;
 614
 615                         info->total = ret;
 616                         info->list = (struct node_action_pair *)(info + 1);
 617
 618                         ret = rte_kvargs_process(kvlist, ETH_RING_NUMA_NODE_ACTION_ARG,
 619                                                  parse_kvlist, info);
 620
 621                         if (ret < 0)
 622                                 goto out_free;
 623
 624                         for (info->count = 0; info->count < info->total; info->count++) {
 625                                 ret = eth_dev_ring_create(info->list[info->count].name,
 626                                                           info->list[info->count].node,
 627                                                           info->list[info->count].action,
 628                                                           &eth_dev);
 629                                 if ((ret == -1) &&
 630                                     (info->list[info->count].action == DEV_CREATE)) {
 631                                         PMD_LOG(INFO,
 632                                                 "Attach to pmd_ring for %s",
 633                                                 name);
 634                                         ret = eth_dev_ring_create(name,
 635                                                         info->list[info->count].node,
 636                                                         DEV_ATTACH,
 637                                                         &eth_dev);
 638                                 }
 639                         }
 640                 }
 641         }
 642
 643         if (eth_dev)
 644                 eth_dev->device = &dev->device;
 645
 646 out_free:
 647         rte_kvargs_free(kvlist);
 648         rte_free(info);
 649         return ret;
 650 }
 651
 652 static int
 653 rte_pmd_ring_remove(struct rte_vdev_device *dev)
 654 {
 655         const char *name = rte_vdev_device_name(dev);
 656         struct rte_eth_dev *eth_dev = NULL;
 657         struct pmd_internals *internals = NULL;
 658         struct ring_queue *r = NULL;
 659         uint16_t i;
 660
 661         PMD_LOG(INFO, "Un-Initializing pmd_ring for %s", name);
 662
 663         if (name == NULL)
 664                 return -EINVAL;
 665
 666         /* find an ethdev entry */
 667         eth_dev = rte_eth_dev_allocated(name);
 668         if (eth_dev == NULL)
 669                 return -ENODEV;
 670
 671         eth_dev_stop(eth_dev);
 672
 673         internals = eth_dev->data->dev_private;
 674         if (internals->action == DEV_CREATE) {
 675                 /*
 676                  * it is only necessary to delete the rings in rx_queues because
 677                  * they are the same used in tx_queues
 678                  */
 679                 for (i = 0; i < eth_dev->data->nb_rx_queues; i++) {
 680                         r = eth_dev->data->rx_queues[i];
 681                         rte_ring_free(r->rng);
 682                 }
 683         }
 684
 685         /* mac_addrs must not be freed alone because part of dev_private */
 686         eth_dev->data->mac_addrs = NULL;
 687         rte_eth_dev_release_port(eth_dev);
 688         return 0;
 689 }
 690
 691 static struct rte_vdev_driver pmd_ring_drv = {
 692         .probe = rte_pmd_ring_probe,
 693         .remove = rte_pmd_ring_remove,
 694 };
 695
 696 RTE_PMD_REGISTER_VDEV(net_ring, pmd_ring_drv);
 697 RTE_PMD_REGISTER_ALIAS(net_ring, eth_ring);
 698 RTE_PMD_REGISTER_PARAM_STRING(net_ring,
 699         ETH_RING_NUMA_NODE_ACTION_ARG "=name:node:action(ATTACH|CREATE)");
 700
 701 RTE_INIT(eth_ring_init_log)
 702 {
 703         eth_ring_logtype = rte_log_register("pmd.net.ring");
 704         if (eth_ring_logtype >= 0)
 705                 rte_log_set_level(eth_ring_logtype, RTE_LOG_NOTICE);
 706 }