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