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