drivers/net/ring/rte_eth_ring.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2015 Intel Corporation. All rights reserved.
   5  *   All rights reserved.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  17  *     * Neither the name of Intel Corporation nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #include "rte_eth_ring.h"
  35 #include <rte_mbuf.h>
  36 #include <rte_ethdev.h>
  37 #include <rte_malloc.h>
  38 #include <rte_memcpy.h>
  39 #include <rte_memzone.h>
  40 #include <rte_string_fns.h>
  41 #include <rte_vdev.h>
  42 #include <rte_kvargs.h>
  43 #include <rte_errno.h>
  44
  45 #define ETH_RING_NUMA_NODE_ACTION_ARG   "nodeaction"
  46 #define ETH_RING_ACTION_CREATE          "CREATE"
  47 #define ETH_RING_ACTION_ATTACH          "ATTACH"
  48
  49 static const char *valid_arguments[] = {
  50         ETH_RING_NUMA_NODE_ACTION_ARG,
  51         NULL
  52 };
  53
  54 enum dev_action {
  55         DEV_CREATE,
  56         DEV_ATTACH
  57 };
  58
  59 struct ring_queue {
  60         struct rte_ring *rng;
  61         rte_atomic64_t rx_pkts;
  62         rte_atomic64_t tx_pkts;
  63         rte_atomic64_t err_pkts;
  64 };
  65
  66 struct pmd_internals {
  67         unsigned max_rx_queues;
  68         unsigned max_tx_queues;
  69
  70         struct ring_queue rx_ring_queues[RTE_PMD_RING_MAX_RX_RINGS];
  71         struct ring_queue tx_ring_queues[RTE_PMD_RING_MAX_TX_RINGS];
  72
  73         struct ether_addr address;
  74         enum dev_action action;
  75 };
  76
  77
  78 static struct rte_eth_link pmd_link = {
  79                 .link_speed = ETH_SPEED_NUM_10G,
  80                 .link_duplex = ETH_LINK_FULL_DUPLEX,
  81                 .link_status = ETH_LINK_DOWN,
  82                 .link_autoneg = ETH_LINK_SPEED_AUTONEG
  83 };
  84
  85 static uint16_t
  86 eth_ring_rx(void *q, struct rte_mbuf **bufs, uint16_t nb_bufs)
  87 {
  88         void **ptrs = (void *)&bufs[0];
  89         struct ring_queue *r = q;
  90         const uint16_t nb_rx = (uint16_t)rte_ring_dequeue_burst(r->rng,
  91                         ptrs, nb_bufs, NULL);
  92         if (r->rng->flags & RING_F_SC_DEQ)
  93                 r->rx_pkts.cnt += nb_rx;
  94         else
  95                 rte_atomic64_add(&(r->rx_pkts), nb_rx);
  96         return nb_rx;
  97 }
  98
  99 static uint16_t
 100 eth_ring_tx(void *q, struct rte_mbuf **bufs, uint16_t nb_bufs)
 101 {
 102         void **ptrs = (void *)&bufs[0];
 103         struct ring_queue *r = q;
 104         const uint16_t nb_tx = (uint16_t)rte_ring_enqueue_burst(r->rng,
 105                         ptrs, nb_bufs, NULL);
 106         if (r->rng->flags & RING_F_SP_ENQ) {
 107                 r->tx_pkts.cnt += nb_tx;
 108                 r->err_pkts.cnt += nb_bufs - nb_tx;
 109         } else {
 110                 rte_atomic64_add(&(r->tx_pkts), nb_tx);
 111                 rte_atomic64_add(&(r->err_pkts), nb_bufs - nb_tx);
 112         }
 113         return nb_tx;
 114 }
 115
 116 static int
 117 eth_dev_configure(struct rte_eth_dev *dev __rte_unused) { return 0; }
 118
 119 static int
 120 eth_dev_start(struct rte_eth_dev *dev)
 121 {
 122         dev->data->dev_link.link_status = ETH_LINK_UP;
 123         return 0;
 124 }
 125
 126 static void
 127 eth_dev_stop(struct rte_eth_dev *dev)
 128 {
 129         dev->data->dev_link.link_status = ETH_LINK_DOWN;
 130 }
 131
 132 static int
 133 eth_dev_set_link_down(struct rte_eth_dev *dev)
 134 {
 135         dev->data->dev_link.link_status = ETH_LINK_DOWN;
 136         return 0;
 137 }
 138
 139 static int
 140 eth_dev_set_link_up(struct rte_eth_dev *dev)
 141 {
 142         dev->data->dev_link.link_status = ETH_LINK_UP;
 143         return 0;
 144 }
 145
 146 static int
 147 eth_rx_queue_setup(struct rte_eth_dev *dev, uint16_t rx_queue_id,
 148                                     uint16_t nb_rx_desc __rte_unused,
 149                                     unsigned int socket_id __rte_unused,
 150                                     const struct rte_eth_rxconf *rx_conf __rte_unused,
 151                                     struct rte_mempool *mb_pool __rte_unused)
 152 {
 153         struct pmd_internals *internals = dev->data->dev_private;
 154         dev->data->rx_queues[rx_queue_id] = &internals->rx_ring_queues[rx_queue_id];
 155         return 0;
 156 }
 157
 158 static int
 159 eth_tx_queue_setup(struct rte_eth_dev *dev, uint16_t tx_queue_id,
 160                                     uint16_t nb_tx_desc __rte_unused,
 161                                     unsigned int socket_id __rte_unused,
 162                                     const struct rte_eth_txconf *tx_conf __rte_unused)
 163 {
 164         struct pmd_internals *internals = dev->data->dev_private;
 165         dev->data->tx_queues[tx_queue_id] = &internals->tx_ring_queues[tx_queue_id];
 166         return 0;
 167 }
 168
 169
 170 static void
 171 eth_dev_info(struct rte_eth_dev *dev,
 172                 struct rte_eth_dev_info *dev_info)
 173 {
 174         struct pmd_internals *internals = dev->data->dev_private;
 175         dev_info->max_mac_addrs = 1;
 176         dev_info->max_rx_pktlen = (uint32_t)-1;
 177         dev_info->max_rx_queues = (uint16_t)internals->max_rx_queues;
 178         dev_info->max_tx_queues = (uint16_t)internals->max_tx_queues;
 179         dev_info->min_rx_bufsize = 0;
 180 }
 181
 182 static void
 183 eth_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *stats)
 184 {
 185         unsigned i;
 186         unsigned long rx_total = 0, tx_total = 0, tx_err_total = 0;
 187         const struct pmd_internals *internal = dev->data->dev_private;
 188
 189         for (i = 0; i < RTE_ETHDEV_QUEUE_STAT_CNTRS &&
 190                         i < dev->data->nb_rx_queues; i++) {
 191                 stats->q_ipackets[i] = internal->rx_ring_queues[i].rx_pkts.cnt;
 192                 rx_total += stats->q_ipackets[i];
 193         }
 194
 195         for (i = 0; i < RTE_ETHDEV_QUEUE_STAT_CNTRS &&
 196                         i < dev->data->nb_tx_queues; i++) {
 197                 stats->q_opackets[i] = internal->tx_ring_queues[i].tx_pkts.cnt;
 198                 stats->q_errors[i] = internal->tx_ring_queues[i].err_pkts.cnt;
 199                 tx_total += stats->q_opackets[i];
 200                 tx_err_total += stats->q_errors[i];
 201         }
 202
 203         stats->ipackets = rx_total;
 204         stats->opackets = tx_total;
 205         stats->oerrors = tx_err_total;
 206 }
 207
 208 static void
 209 eth_stats_reset(struct rte_eth_dev *dev)
 210 {
 211         unsigned i;
 212         struct pmd_internals *internal = dev->data->dev_private;
 213         for (i = 0; i < dev->data->nb_rx_queues; i++)
 214                 internal->rx_ring_queues[i].rx_pkts.cnt = 0;
 215         for (i = 0; i < dev->data->nb_tx_queues; i++) {
 216                 internal->tx_ring_queues[i].tx_pkts.cnt = 0;
 217                 internal->tx_ring_queues[i].err_pkts.cnt = 0;
 218         }
 219 }
 220
 221 static void
 222 eth_mac_addr_remove(struct rte_eth_dev *dev __rte_unused,
 223         uint32_t index __rte_unused)
 224 {
 225 }
 226
 227 static int
 228 eth_mac_addr_add(struct rte_eth_dev *dev __rte_unused,
 229         struct ether_addr *mac_addr __rte_unused,
 230         uint32_t index __rte_unused,
 231         uint32_t vmdq __rte_unused)
 232 {
 233         return 0;
 234 }
 235
 236 static void
 237 eth_queue_release(void *q __rte_unused) { ; }
 238 static int
 239 eth_link_update(struct rte_eth_dev *dev __rte_unused,
 240                 int wait_to_complete __rte_unused) { return 0; }
 241
 242 static const struct eth_dev_ops ops = {
 243         .dev_start = eth_dev_start,
 244         .dev_stop = eth_dev_stop,
 245         .dev_set_link_up = eth_dev_set_link_up,
 246         .dev_set_link_down = eth_dev_set_link_down,
 247         .dev_configure = eth_dev_configure,
 248         .dev_infos_get = eth_dev_info,
 249         .rx_queue_setup = eth_rx_queue_setup,
 250         .tx_queue_setup = eth_tx_queue_setup,
 251         .rx_queue_release = eth_queue_release,
 252         .tx_queue_release = eth_queue_release,
 253         .link_update = eth_link_update,
 254         .stats_get = eth_stats_get,
 255         .stats_reset = eth_stats_reset,
 256         .mac_addr_remove = eth_mac_addr_remove,
 257         .mac_addr_add = eth_mac_addr_add,
 258 };
 259
 260 static struct rte_vdev_driver pmd_ring_drv;
 261
 262 static int
 263 do_eth_dev_ring_create(const char *name,
 264                 struct rte_ring * const rx_queues[], const unsigned nb_rx_queues,
 265                 struct rte_ring *const tx_queues[], const unsigned nb_tx_queues,
 266                 const unsigned int numa_node, enum dev_action action,
 267                 struct rte_eth_dev **eth_dev_p)
 268 {
 269         struct rte_eth_dev_data *data = NULL;
 270         struct pmd_internals *internals = NULL;
 271         struct rte_eth_dev *eth_dev = NULL;
 272         unsigned i;
 273
 274         RTE_LOG(INFO, PMD, "Creating rings-backed ethdev on numa socket %u\n",
 275                         numa_node);
 276
 277         /* now do all data allocation - for eth_dev structure, dummy pci driver
 278          * and internal (private) data
 279          */
 280         data = rte_zmalloc_socket(name, sizeof(*data), 0, numa_node);
 281         if (data == NULL) {
 282                 rte_errno = ENOMEM;
 283                 goto error;
 284         }
 285
 286         data->rx_queues = rte_zmalloc_socket(name,
 287                         sizeof(void *) * nb_rx_queues, 0, numa_node);
 288         if (data->rx_queues == NULL) {
 289                 rte_errno = ENOMEM;
 290                 goto error;
 291         }
 292
 293         data->tx_queues = rte_zmalloc_socket(name,
 294                         sizeof(void *) * nb_tx_queues, 0, numa_node);
 295         if (data->tx_queues == NULL) {
 296                 rte_errno = ENOMEM;
 297                 goto error;
 298         }
 299
 300         internals = rte_zmalloc_socket(name, sizeof(*internals), 0, numa_node);
 301         if (internals == NULL) {
 302                 rte_errno = ENOMEM;
 303                 goto error;
 304         }
 305
 306         /* reserve an ethdev entry */
 307         eth_dev = rte_eth_dev_allocate(name);
 308         if (eth_dev == NULL) {
 309                 rte_errno = ENOSPC;
 310                 goto error;
 311         }
 312
 313         /* now put it all together
 314          * - store queue data in internals,
 315          * - store numa_node info in eth_dev_data
 316          * - point eth_dev_data to internals
 317          * - and point eth_dev structure to new eth_dev_data structure
 318          */
 319         /* NOTE: we'll replace the data element, of originally allocated eth_dev
 320          * so the rings are local per-process */
 321
 322         internals->action = action;
 323         internals->max_rx_queues = nb_rx_queues;
 324         internals->max_tx_queues = nb_tx_queues;
 325         for (i = 0; i < nb_rx_queues; i++) {
 326                 internals->rx_ring_queues[i].rng = rx_queues[i];
 327                 data->rx_queues[i] = &internals->rx_ring_queues[i];
 328         }
 329         for (i = 0; i < nb_tx_queues; i++) {
 330                 internals->tx_ring_queues[i].rng = tx_queues[i];
 331                 data->tx_queues[i] = &internals->tx_ring_queues[i];
 332         }
 333
 334         data->dev_private = internals;
 335         data->port_id = eth_dev->data->port_id;
 336         memmove(data->name, eth_dev->data->name, sizeof(data->name));
 337         data->nb_rx_queues = (uint16_t)nb_rx_queues;
 338         data->nb_tx_queues = (uint16_t)nb_tx_queues;
 339         data->dev_link = pmd_link;
 340         data->mac_addrs = &internals->address;
 341
 342         eth_dev->data = data;
 343         eth_dev->dev_ops = &ops;
 344         data->dev_flags = RTE_ETH_DEV_DETACHABLE;
 345         data->kdrv = RTE_KDRV_NONE;
 346         data->drv_name = pmd_ring_drv.driver.name;
 347         data->numa_node = numa_node;
 348
 349         /* finally assign rx and tx ops */
 350         eth_dev->rx_pkt_burst = eth_ring_rx;
 351         eth_dev->tx_pkt_burst = eth_ring_tx;
 352
 353         *eth_dev_p = eth_dev;
 354
 355         return data->port_id;
 356
 357 error:
 358         if (data) {
 359                 rte_free(data->rx_queues);
 360                 rte_free(data->tx_queues);
 361         }
 362         rte_free(data);
 363         rte_free(internals);
 364
 365         return -1;
 366 }
 367
 368 int
 369 rte_eth_from_rings(const char *name, struct rte_ring *const rx_queues[],
 370                 const unsigned nb_rx_queues,
 371                 struct rte_ring *const tx_queues[],
 372                 const unsigned nb_tx_queues,
 373                 const unsigned numa_node)
 374 {
 375         struct rte_eth_dev *eth_dev = NULL;
 376
 377         /* do some parameter checking */
 378         if (rx_queues == NULL && nb_rx_queues > 0) {
 379                 rte_errno = EINVAL;
 380                 return -1;
 381         }
 382         if (tx_queues == NULL && nb_tx_queues > 0) {
 383                 rte_errno = EINVAL;
 384                 return -1;
 385         }
 386         if (nb_rx_queues > RTE_PMD_RING_MAX_RX_RINGS) {
 387                 rte_errno = EINVAL;
 388                 return -1;
 389         }
 390
 391         return do_eth_dev_ring_create(name, rx_queues, nb_rx_queues,
 392                         tx_queues, nb_tx_queues, numa_node, DEV_ATTACH,
 393                         &eth_dev);
 394 }
 395
 396 int
 397 rte_eth_from_ring(struct rte_ring *r)
 398 {
 399         return rte_eth_from_rings(r->name, &r, 1, &r, 1,
 400                         r->memzone ? r->memzone->socket_id : SOCKET_ID_ANY);
 401 }
 402
 403 static int
 404 eth_dev_ring_create(const char *name, const unsigned numa_node,
 405                 enum dev_action action, struct rte_eth_dev **eth_dev)
 406 {
 407         /* rx and tx are so-called from point of view of first port.
 408          * They are inverted from the point of view of second port
 409          */
 410         struct rte_ring *rxtx[RTE_PMD_RING_MAX_RX_RINGS];
 411         unsigned i;
 412         char rng_name[RTE_RING_NAMESIZE];
 413         unsigned num_rings = RTE_MIN(RTE_PMD_RING_MAX_RX_RINGS,
 414                         RTE_PMD_RING_MAX_TX_RINGS);
 415
 416         for (i = 0; i < num_rings; i++) {
 417                 snprintf(rng_name, sizeof(rng_name), "ETH_RXTX%u_%s", i, name);
 418                 rxtx[i] = (action == DEV_CREATE) ?
 419                                 rte_ring_create(rng_name, 1024, numa_node,
 420                                                 RING_F_SP_ENQ|RING_F_SC_DEQ) :
 421                                 rte_ring_lookup(rng_name);
 422                 if (rxtx[i] == NULL)
 423                         return -1;
 424         }
 425
 426         if (do_eth_dev_ring_create(name, rxtx, num_rings, rxtx, num_rings,
 427                 numa_node, action, eth_dev) < 0)
 428                 return -1;
 429
 430         return 0;
 431 }
 432
 433 struct node_action_pair {
 434         char name[PATH_MAX];
 435         unsigned node;
 436         enum dev_action action;
 437 };
 438
 439 struct node_action_list {
 440         unsigned total;
 441         unsigned count;
 442         struct node_action_pair *list;
 443 };
 444
 445 static int parse_kvlist (const char *key __rte_unused, const char *value, void *data)
 446 {
 447         struct node_action_list *info = data;
 448         int ret;
 449         char *name;
 450         char *action;
 451         char *node;
 452         char *end;
 453
 454         name = strdup(value);
 455
 456         ret = -EINVAL;
 457
 458         if (!name) {
 459                 RTE_LOG(WARNING, PMD, "command line paramter is empty for ring pmd!\n");
 460                 goto out;
 461         }
 462
 463         node = strchr(name, ':');
 464         if (!node) {
 465                 RTE_LOG(WARNING, PMD, "could not parse node value from %s", name);
 466                 goto out;
 467         }
 468
 469         *node = '\0';
 470         node++;
 471
 472         action = strchr(node, ':');
 473         if (!action) {
 474                 RTE_LOG(WARNING, PMD, "could not action value from %s", node);
 475                 goto out;
 476         }
 477
 478         *action = '\0';
 479         action++;
 480
 481         /*
 482          * Need to do some sanity checking here
 483          */
 484
 485         if (strcmp(action, ETH_RING_ACTION_ATTACH) == 0)
 486                 info->list[info->count].action = DEV_ATTACH;
 487         else if (strcmp(action, ETH_RING_ACTION_CREATE) == 0)
 488                 info->list[info->count].action = DEV_CREATE;
 489         else
 490                 goto out;
 491
 492         errno = 0;
 493         info->list[info->count].node = strtol(node, &end, 10);
 494
 495         if ((errno != 0) || (*end != '\0')) {
 496                 RTE_LOG(WARNING, PMD, "node value %s is unparseable as a number\n", 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 rte_pmd_ring_probe(struct rte_vdev_device *dev)
 512 {
 513         const char *name, *params;
 514         struct rte_kvargs *kvlist = NULL;
 515         int ret = 0;
 516         struct node_action_list *info = NULL;
 517         struct rte_eth_dev *eth_dev = NULL;
 518
 519         name = rte_vdev_device_name(dev);
 520         params = rte_vdev_device_args(dev);
 521
 522         RTE_LOG(INFO, PMD, "Initializing pmd_ring for %s\n", name);
 523
 524         if (params == NULL || params[0] == '\0') {
 525                 ret = eth_dev_ring_create(name, rte_socket_id(), DEV_CREATE,
 526                                 &eth_dev);
 527                 if (ret == -1) {
 528                         RTE_LOG(INFO, PMD,
 529                                 "Attach to pmd_ring for %s\n", name);
 530                         ret = eth_dev_ring_create(name, rte_socket_id(),
 531                                                   DEV_ATTACH, &eth_dev);
 532                 }
 533         }
 534         else {
 535                 kvlist = rte_kvargs_parse(params, valid_arguments);
 536
 537                 if (!kvlist) {
 538                         RTE_LOG(INFO, PMD, "Ignoring unsupported parameters when creating"
 539                                         " rings-backed ethernet device\n");
 540                         ret = eth_dev_ring_create(name, rte_socket_id(),
 541                                                   DEV_CREATE, &eth_dev);
 542                         if (ret == -1) {
 543                                 RTE_LOG(INFO, PMD,
 544                                         "Attach to pmd_ring for %s\n",
 545                                         name);
 546                                 ret = eth_dev_ring_create(name, rte_socket_id(),
 547                                                           DEV_ATTACH, &eth_dev);
 548                         }
 549                         return ret;
 550                 } else {
 551                         ret = rte_kvargs_count(kvlist, ETH_RING_NUMA_NODE_ACTION_ARG);
 552                         info = rte_zmalloc("struct node_action_list",
 553                                            sizeof(struct node_action_list) +
 554                                            (sizeof(struct node_action_pair) * ret),
 555                                            0);
 556                         if (!info)
 557                                 goto out_free;
 558
 559                         info->total = ret;
 560                         info->list = (struct node_action_pair*)(info + 1);
 561
 562                         ret = rte_kvargs_process(kvlist, ETH_RING_NUMA_NODE_ACTION_ARG,
 563                                                  parse_kvlist, info);
 564
 565                         if (ret < 0)
 566                                 goto out_free;
 567
 568                         for (info->count = 0; info->count < info->total; info->count++) {
 569                                 ret = eth_dev_ring_create(info->list[info->count].name,
 570                                                           info->list[info->count].node,
 571                                                           info->list[info->count].action,
 572                                                           &eth_dev);
 573                                 if ((ret == -1) &&
 574                                     (info->list[info->count].action == DEV_CREATE)) {
 575                                         RTE_LOG(INFO, PMD,
 576                                                 "Attach to pmd_ring for %s\n",
 577                                                 name);
 578                                         ret = eth_dev_ring_create(name,
 579                                                         info->list[info->count].node,
 580                                                         DEV_ATTACH,
 581                                                         &eth_dev);
 582                                 }
 583                         }
 584                 }
 585         }
 586
 587         if (eth_dev)
 588                 eth_dev->device = &dev->device;
 589
 590 out_free:
 591         rte_kvargs_free(kvlist);
 592         rte_free(info);
 593         return ret;
 594 }
 595
 596 static int
 597 rte_pmd_ring_remove(struct rte_vdev_device *dev)
 598 {
 599         const char *name = rte_vdev_device_name(dev);
 600         struct rte_eth_dev *eth_dev = NULL;
 601         struct pmd_internals *internals = NULL;
 602         struct ring_queue *r = NULL;
 603         uint16_t i;
 604
 605         RTE_LOG(INFO, PMD, "Un-Initializing pmd_ring for %s\n", name);
 606
 607         if (name == NULL)
 608                 return -EINVAL;
 609
 610         /* find an ethdev entry */
 611         eth_dev = rte_eth_dev_allocated(name);
 612         if (eth_dev == NULL)
 613                 return -ENODEV;
 614
 615         eth_dev_stop(eth_dev);
 616
 617         internals = eth_dev->data->dev_private;
 618         if (internals->action == DEV_CREATE) {
 619                 /*
 620                  * it is only necessary to delete the rings in rx_queues because
 621                  * they are the same used in tx_queues
 622                  */
 623                 for (i = 0; i < eth_dev->data->nb_rx_queues; i++) {
 624                         r = eth_dev->data->rx_queues[i];
 625                         rte_ring_free(r->rng);
 626                 }
 627         }
 628
 629         rte_free(eth_dev->data->rx_queues);
 630         rte_free(eth_dev->data->tx_queues);
 631         rte_free(eth_dev->data->dev_private);
 632
 633         rte_free(eth_dev->data);
 634
 635         rte_eth_dev_release_port(eth_dev);
 636         return 0;
 637 }
 638
 639 static struct rte_vdev_driver pmd_ring_drv = {
 640         .probe = rte_pmd_ring_probe,
 641         .remove = rte_pmd_ring_remove,
 642 };
 643
 644 RTE_PMD_REGISTER_VDEV(net_ring, pmd_ring_drv);
 645 RTE_PMD_REGISTER_ALIAS(net_ring, eth_ring);
 646 RTE_PMD_REGISTER_PARAM_STRING(net_ring,
 647         ETH_RING_NUMA_NODE_ACTION_ARG "=name:node:action(ATTACH|CREATE)");