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 int max_rx_queues;
  49         unsigned int 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 rte_ether_addr address;
  55         enum dev_action action;
  56 };
  57
  58 static struct rte_eth_link pmd_link = {
  59         .link_speed = ETH_SPEED_NUM_10G,
  60         .link_duplex = ETH_LINK_FULL_DUPLEX,
  61         .link_status = ETH_LINK_DOWN,
  62         .link_autoneg = ETH_LINK_FIXED,
  63 };
  64
  65 static int eth_ring_logtype;
  66
  67 #define PMD_LOG(level, fmt, args...) \
  68         rte_log(RTE_LOG_ ## level, eth_ring_logtype, \
  69                 "%s(): " fmt "\n", __func__, ##args)
  70
  71 static uint16_t
  72 eth_ring_rx(void *q, struct rte_mbuf **bufs, uint16_t nb_bufs)
  73 {
  74         void **ptrs = (void *)&bufs[0];
  75         struct ring_queue *r = q;
  76         const uint16_t nb_rx = (uint16_t)rte_ring_dequeue_burst(r->rng,
  77                         ptrs, nb_bufs, NULL);
  78         if (r->rng->flags & RING_F_SC_DEQ)
  79                 r->rx_pkts.cnt += nb_rx;
  80         else
  81                 rte_atomic64_add(&(r->rx_pkts), nb_rx);
  82         return nb_rx;
  83 }
  84
  85 static uint16_t
  86 eth_ring_tx(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_tx = (uint16_t)rte_ring_enqueue_burst(r->rng,
  91                         ptrs, nb_bufs, NULL);
  92         if (r->rng->flags & RING_F_SP_ENQ) {
  93                 r->tx_pkts.cnt += nb_tx;
  94                 r->err_pkts.cnt += nb_bufs - nb_tx;
  95         } else {
  96                 rte_atomic64_add(&(r->tx_pkts), nb_tx);
  97                 rte_atomic64_add(&(r->err_pkts), nb_bufs - nb_tx);
  98         }
  99         return nb_tx;
 100 }
 101
 102 static int
 103 eth_dev_configure(struct rte_eth_dev *dev __rte_unused) { return 0; }
 104
 105 static int
 106 eth_dev_start(struct rte_eth_dev *dev)
 107 {
 108         dev->data->dev_link.link_status = ETH_LINK_UP;
 109         return 0;
 110 }
 111
 112 static void
 113 eth_dev_stop(struct rte_eth_dev *dev)
 114 {
 115         dev->data->dev_link.link_status = ETH_LINK_DOWN;
 116 }
 117
 118 static int
 119 eth_dev_set_link_down(struct rte_eth_dev *dev)
 120 {
 121         dev->data->dev_link.link_status = ETH_LINK_DOWN;
 122         return 0;
 123 }
 124
 125 static int
 126 eth_dev_set_link_up(struct rte_eth_dev *dev)
 127 {
 128         dev->data->dev_link.link_status = ETH_LINK_UP;
 129         return 0;
 130 }
 131
 132 static int
 133 eth_rx_queue_setup(struct rte_eth_dev *dev, uint16_t rx_queue_id,
 134                                     uint16_t nb_rx_desc __rte_unused,
 135                                     unsigned int socket_id __rte_unused,
 136                                     const struct rte_eth_rxconf *rx_conf __rte_unused,
 137                                     struct rte_mempool *mb_pool __rte_unused)
 138 {
 139         struct pmd_internals *internals = dev->data->dev_private;
 140
 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
 153         dev->data->tx_queues[tx_queue_id] = &internals->tx_ring_queues[tx_queue_id];
 154         return 0;
 155 }
 156
 157
 158 static void
 159 eth_dev_info(struct rte_eth_dev *dev,
 160              struct rte_eth_dev_info *dev_info)
 161 {
 162         struct pmd_internals *internals = dev->data->dev_private;
 163
 164         dev_info->max_mac_addrs = 1;
 165         dev_info->max_rx_pktlen = (uint32_t)-1;
 166         dev_info->max_rx_queues = (uint16_t)internals->max_rx_queues;
 167         dev_info->max_tx_queues = (uint16_t)internals->max_tx_queues;
 168         dev_info->min_rx_bufsize = 0;
 169 }
 170
 171 static int
 172 eth_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *stats)
 173 {
 174         unsigned int i;
 175         unsigned long rx_total = 0, tx_total = 0, tx_err_total = 0;
 176         const struct pmd_internals *internal = dev->data->dev_private;
 177
 178         for (i = 0; i < RTE_ETHDEV_QUEUE_STAT_CNTRS &&
 179                         i < dev->data->nb_rx_queues; i++) {
 180                 stats->q_ipackets[i] = internal->rx_ring_queues[i].rx_pkts.cnt;
 181                 rx_total += stats->q_ipackets[i];
 182         }
 183
 184         for (i = 0; i < RTE_ETHDEV_QUEUE_STAT_CNTRS &&
 185                         i < dev->data->nb_tx_queues; i++) {
 186                 stats->q_opackets[i] = internal->tx_ring_queues[i].tx_pkts.cnt;
 187                 tx_total += stats->q_opackets[i];
 188                 tx_err_total += internal->tx_ring_queues[i].err_pkts.cnt;
 189         }
 190
 191         stats->ipackets = rx_total;
 192         stats->opackets = tx_total;
 193         stats->oerrors = tx_err_total;
 194
 195         return 0;
 196 }
 197
 198 static void
 199 eth_stats_reset(struct rte_eth_dev *dev)
 200 {
 201         unsigned int i;
 202         struct pmd_internals *internal = dev->data->dev_private;
 203
 204         for (i = 0; i < dev->data->nb_rx_queues; i++)
 205                 internal->rx_ring_queues[i].rx_pkts.cnt = 0;
 206         for (i = 0; i < dev->data->nb_tx_queues; i++) {
 207                 internal->tx_ring_queues[i].tx_pkts.cnt = 0;
 208                 internal->tx_ring_queues[i].err_pkts.cnt = 0;
 209         }
 210 }
 211
 212 static void
 213 eth_mac_addr_remove(struct rte_eth_dev *dev __rte_unused,
 214         uint32_t index __rte_unused)
 215 {
 216 }
 217
 218 static int
 219 eth_mac_addr_add(struct rte_eth_dev *dev __rte_unused,
 220         struct rte_ether_addr *mac_addr __rte_unused,
 221         uint32_t index __rte_unused,
 222         uint32_t vmdq __rte_unused)
 223 {
 224         return 0;
 225 }
 226
 227 static void
 228 eth_queue_release(void *q __rte_unused) { ; }
 229 static int
 230 eth_link_update(struct rte_eth_dev *dev __rte_unused,
 231                 int wait_to_complete __rte_unused) { return 0; }
 232
 233 static const struct eth_dev_ops ops = {
 234         .dev_start = eth_dev_start,
 235         .dev_stop = eth_dev_stop,
 236         .dev_set_link_up = eth_dev_set_link_up,
 237         .dev_set_link_down = eth_dev_set_link_down,
 238         .dev_configure = eth_dev_configure,
 239         .dev_infos_get = eth_dev_info,
 240         .rx_queue_setup = eth_rx_queue_setup,
 241         .tx_queue_setup = eth_tx_queue_setup,
 242         .rx_queue_release = eth_queue_release,
 243         .tx_queue_release = eth_queue_release,
 244         .link_update = eth_link_update,
 245         .stats_get = eth_stats_get,
 246         .stats_reset = eth_stats_reset,
 247         .mac_addr_remove = eth_mac_addr_remove,
 248         .mac_addr_add = eth_mac_addr_add,
 249 };
 250
 251 static int
 252 do_eth_dev_ring_create(const char *name,
 253                 struct rte_ring * const rx_queues[],
 254                 const unsigned int nb_rx_queues,
 255                 struct rte_ring *const tx_queues[],
 256                 const unsigned int nb_tx_queues,
 257                 const unsigned int numa_node, enum dev_action action,
 258                 struct rte_eth_dev **eth_dev_p)
 259 {
 260         struct rte_eth_dev_data *data = NULL;
 261         struct pmd_internals *internals = NULL;
 262         struct rte_eth_dev *eth_dev = NULL;
 263         void **rx_queues_local = NULL;
 264         void **tx_queues_local = NULL;
 265         unsigned int i;
 266
 267         PMD_LOG(INFO, "Creating rings-backed ethdev on numa socket %u",
 268                         numa_node);
 269
 270         rx_queues_local = rte_calloc_socket(name, nb_rx_queues,
 271                                             sizeof(void *), 0, numa_node);
 272         if (rx_queues_local == NULL) {
 273                 rte_errno = ENOMEM;
 274                 goto error;
 275         }
 276
 277         tx_queues_local = rte_calloc_socket(name, nb_tx_queues,
 278                                             sizeof(void *), 0, numa_node);
 279         if (tx_queues_local == NULL) {
 280                 rte_errno = ENOMEM;
 281                 goto error;
 282         }
 283
 284         internals = rte_zmalloc_socket(name, sizeof(*internals), 0, numa_node);
 285         if (internals == NULL) {
 286                 rte_errno = ENOMEM;
 287                 goto error;
 288         }
 289
 290         /* reserve an ethdev entry */
 291         eth_dev = rte_eth_dev_allocate(name);
 292         if (eth_dev == NULL) {
 293                 rte_errno = ENOSPC;
 294                 goto error;
 295         }
 296
 297         /* now put it all together
 298          * - store queue data in internals,
 299          * - store numa_node info in eth_dev_data
 300          * - point eth_dev_data to internals
 301          * - and point eth_dev structure to new eth_dev_data structure
 302          */
 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
 326         eth_dev->dev_ops = &ops;
 327         data->kdrv = RTE_KDRV_NONE;
 328         data->numa_node = numa_node;
 329
 330         /* finally assign rx and tx ops */
 331         eth_dev->rx_pkt_burst = eth_ring_rx;
 332         eth_dev->tx_pkt_burst = eth_ring_tx;
 333
 334         rte_eth_dev_probing_finish(eth_dev);
 335         *eth_dev_p = eth_dev;
 336
 337         return data->port_id;
 338
 339 error:
 340         rte_free(rx_queues_local);
 341         rte_free(tx_queues_local);
 342         rte_free(internals);
 343
 344         return -1;
 345 }
 346
 347 int
 348 rte_eth_from_rings(const char *name, struct rte_ring *const rx_queues[],
 349                 const unsigned int nb_rx_queues,
 350                 struct rte_ring *const tx_queues[],
 351                 const unsigned int nb_tx_queues,
 352                 const unsigned int numa_node)
 353 {
 354         struct ring_internal_args args = {
 355                 .rx_queues = rx_queues,
 356                 .nb_rx_queues = nb_rx_queues,
 357                 .tx_queues = tx_queues,
 358                 .nb_tx_queues = nb_tx_queues,
 359                 .numa_node = numa_node,
 360                 .addr = &args,
 361         };
 362         char args_str[32];
 363         char ring_name[RTE_RING_NAMESIZE];
 364         uint16_t port_id = RTE_MAX_ETHPORTS;
 365         int ret;
 366
 367         /* do some parameter checking */
 368         if (rx_queues == NULL && nb_rx_queues > 0) {
 369                 rte_errno = EINVAL;
 370                 return -1;
 371         }
 372         if (tx_queues == NULL && nb_tx_queues > 0) {
 373                 rte_errno = EINVAL;
 374                 return -1;
 375         }
 376         if (nb_rx_queues > RTE_PMD_RING_MAX_RX_RINGS) {
 377                 rte_errno = EINVAL;
 378                 return -1;
 379         }
 380
 381         snprintf(args_str, sizeof(args_str), "%s=%p",
 382                  ETH_RING_INTERNAL_ARG, &args);
 383
 384         ret = snprintf(ring_name, sizeof(ring_name), "net_ring_%s", name);
 385         if (ret >= (int)sizeof(ring_name)) {
 386                 rte_errno = ENAMETOOLONG;
 387                 return -1;
 388         }
 389
 390         ret = rte_vdev_init(ring_name, args_str);
 391         if (ret) {
 392                 rte_errno = EINVAL;
 393                 return -1;
 394         }
 395
 396         ret = rte_eth_dev_get_port_by_name(ring_name, &port_id);
 397         if (ret) {
 398                 rte_errno = ENODEV;
 399                 return -1;
 400         }
 401
 402         return port_id;
 403 }
 404
 405 int
 406 rte_eth_from_ring(struct rte_ring *r)
 407 {
 408         return rte_eth_from_rings(r->name, &r, 1, &r, 1,
 409                         r->memzone ? r->memzone->socket_id : SOCKET_ID_ANY);
 410 }
 411
 412 static int
 413 eth_dev_ring_create(const char *name, const unsigned int numa_node,
 414                 enum dev_action action, struct rte_eth_dev **eth_dev)
 415 {
 416         /* rx and tx are so-called from point of view of first port.
 417          * They are inverted from the point of view of second port
 418          */
 419         struct rte_ring *rxtx[RTE_PMD_RING_MAX_RX_RINGS];
 420         unsigned int i;
 421         char rng_name[RTE_RING_NAMESIZE];
 422         unsigned int num_rings = RTE_MIN(RTE_PMD_RING_MAX_RX_RINGS,
 423                         RTE_PMD_RING_MAX_TX_RINGS);
 424
 425         for (i = 0; i < num_rings; i++) {
 426                 int cc;
 427
 428                 cc = snprintf(rng_name, sizeof(rng_name),
 429                               "ETH_RXTX%u_%s", i, name);
 430                 if (cc >= (int)sizeof(rng_name)) {
 431                         rte_errno = ENAMETOOLONG;
 432                         return -1;
 433                 }
 434
 435                 rxtx[i] = (action == DEV_CREATE) ?
 436                                 rte_ring_create(rng_name, 1024, numa_node,
 437                                                 RING_F_SP_ENQ|RING_F_SC_DEQ) :
 438                                 rte_ring_lookup(rng_name);
 439                 if (rxtx[i] == NULL)
 440                         return -1;
 441         }
 442
 443         if (do_eth_dev_ring_create(name, rxtx, num_rings, rxtx, num_rings,
 444                 numa_node, action, eth_dev) < 0)
 445                 return -1;
 446
 447         return 0;
 448 }
 449
 450 struct node_action_pair {
 451         char name[PATH_MAX];
 452         unsigned int node;
 453         enum dev_action action;
 454 };
 455
 456 struct node_action_list {
 457         unsigned int total;
 458         unsigned int count;
 459         struct node_action_pair *list;
 460 };
 461
 462 static int parse_kvlist(const char *key __rte_unused,
 463                         const char *value, void *data)
 464 {
 465         struct node_action_list *info = data;
 466         int ret;
 467         char *name;
 468         char *action;
 469         char *node;
 470         char *end;
 471
 472         name = strdup(value);
 473
 474         ret = -EINVAL;
 475
 476         if (!name) {
 477                 PMD_LOG(WARNING, "command line parameter is empty for ring pmd!");
 478                 goto out;
 479         }
 480
 481         node = strchr(name, ':');
 482         if (!node) {
 483                 PMD_LOG(WARNING, "could not parse node value from %s",
 484                         name);
 485                 goto out;
 486         }
 487
 488         *node = '\0';
 489         node++;
 490
 491         action = strchr(node, ':');
 492         if (!action) {
 493                 PMD_LOG(WARNING, "could not parse action value from %s",
 494                         node);
 495                 goto out;
 496         }
 497
 498         *action = '\0';
 499         action++;
 500
 501         /*
 502          * Need to do some sanity checking here
 503          */
 504
 505         if (strcmp(action, ETH_RING_ACTION_ATTACH) == 0)
 506                 info->list[info->count].action = DEV_ATTACH;
 507         else if (strcmp(action, ETH_RING_ACTION_CREATE) == 0)
 508                 info->list[info->count].action = DEV_CREATE;
 509         else
 510                 goto out;
 511
 512         errno = 0;
 513         info->list[info->count].node = strtol(node, &end, 10);
 514
 515         if ((errno != 0) || (*end != '\0')) {
 516                 PMD_LOG(WARNING,
 517                         "node value %s is unparseable as a number", node);
 518                 goto out;
 519         }
 520
 521         strlcpy(info->list[info->count].name, name,
 522                 sizeof(info->list[info->count].name));
 523
 524         info->count++;
 525
 526         ret = 0;
 527 out:
 528         free(name);
 529         return ret;
 530 }
 531
 532 static int
 533 parse_internal_args(const char *key __rte_unused, const char *value,
 534                 void *data)
 535 {
 536         struct ring_internal_args **internal_args = data;
 537         void *args;
 538
 539         sscanf(value, "%p", &args);
 540
 541         *internal_args = args;
 542
 543         if ((*internal_args)->addr != args)
 544                 return -1;
 545
 546         return 0;
 547 }
 548
 549 static int
 550 rte_pmd_ring_probe(struct rte_vdev_device *dev)
 551 {
 552         const char *name, *params;
 553         struct rte_kvargs *kvlist = NULL;
 554         int ret = 0;
 555         struct node_action_list *info = NULL;
 556         struct rte_eth_dev *eth_dev = NULL;
 557         struct ring_internal_args *internal_args;
 558
 559         name = rte_vdev_device_name(dev);
 560         params = rte_vdev_device_args(dev);
 561
 562         PMD_LOG(INFO, "Initializing pmd_ring for %s", name);
 563
 564         if (params == NULL || params[0] == '\0') {
 565                 ret = eth_dev_ring_create(name, rte_socket_id(), DEV_CREATE,
 566                                 &eth_dev);
 567                 if (ret == -1) {
 568                         PMD_LOG(INFO,
 569                                 "Attach to pmd_ring for %s", name);
 570                         ret = eth_dev_ring_create(name, rte_socket_id(),
 571                                                   DEV_ATTACH, &eth_dev);
 572                 }
 573         } else {
 574                 kvlist = rte_kvargs_parse(params, valid_arguments);
 575
 576                 if (!kvlist) {
 577                         PMD_LOG(INFO,
 578                                 "Ignoring unsupported parameters when creatingrings-backed ethernet device");
 579                         ret = eth_dev_ring_create(name, rte_socket_id(),
 580                                                   DEV_CREATE, &eth_dev);
 581                         if (ret == -1) {
 582                                 PMD_LOG(INFO,
 583                                         "Attach to pmd_ring for %s",
 584                                         name);
 585                                 ret = eth_dev_ring_create(name, rte_socket_id(),
 586                                                           DEV_ATTACH, &eth_dev);
 587                         }
 588
 589                         if (eth_dev)
 590                                 eth_dev->device = &dev->device;
 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,
 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                                                           info->list[info->count].node,
 633                                                           info->list[info->count].action,
 634                                                           &eth_dev);
 635                                 if ((ret == -1) &&
 636                                     (info->list[info->count].action == DEV_CREATE)) {
 637                                         PMD_LOG(INFO,
 638                                                 "Attach to pmd_ring for %s",
 639                                                 name);
 640                                         ret = eth_dev_ring_create(name,
 641                                                         info->list[info->count].node,
 642                                                         DEV_ATTACH,
 643                                                         &eth_dev);
 644                                 }
 645                         }
 646                 }
 647         }
 648
 649         if (eth_dev)
 650                 eth_dev->device = &dev->device;
 651
 652 out_free:
 653         rte_kvargs_free(kvlist);
 654         rte_free(info);
 655         return ret;
 656 }
 657
 658 static int
 659 rte_pmd_ring_remove(struct rte_vdev_device *dev)
 660 {
 661         const char *name = rte_vdev_device_name(dev);
 662         struct rte_eth_dev *eth_dev = NULL;
 663         struct pmd_internals *internals = NULL;
 664         struct ring_queue *r = NULL;
 665         uint16_t i;
 666
 667         PMD_LOG(INFO, "Un-Initializing pmd_ring for %s", name);
 668
 669         if (name == NULL)
 670                 return -EINVAL;
 671
 672         /* find an ethdev entry */
 673         eth_dev = rte_eth_dev_allocated(name);
 674         if (eth_dev == NULL)
 675                 return -ENODEV;
 676
 677         eth_dev_stop(eth_dev);
 678
 679         internals = eth_dev->data->dev_private;
 680         if (internals->action == DEV_CREATE) {
 681                 /*
 682                  * it is only necessary to delete the rings in rx_queues because
 683                  * they are the same used in tx_queues
 684                  */
 685                 for (i = 0; i < eth_dev->data->nb_rx_queues; i++) {
 686                         r = eth_dev->data->rx_queues[i];
 687                         rte_ring_free(r->rng);
 688                 }
 689         }
 690
 691         /* mac_addrs must not be freed alone because part of dev_private */
 692         eth_dev->data->mac_addrs = NULL;
 693         rte_eth_dev_release_port(eth_dev);
 694         return 0;
 695 }
 696
 697 static struct rte_vdev_driver pmd_ring_drv = {
 698         .probe = rte_pmd_ring_probe,
 699         .remove = rte_pmd_ring_remove,
 700 };
 701
 702 RTE_PMD_REGISTER_VDEV(net_ring, pmd_ring_drv);
 703 RTE_PMD_REGISTER_ALIAS(net_ring, eth_ring);
 704 RTE_PMD_REGISTER_PARAM_STRING(net_ring,
 705         ETH_RING_NUMA_NODE_ACTION_ARG "=name:node:action(ATTACH|CREATE)");
 706
 707 RTE_INIT(eth_ring_init_log)
 708 {
 709         eth_ring_logtype = rte_log_register("pmd.net.ring");
 710         if (eth_ring_logtype >= 0)
 711                 rte_log_set_level(eth_ring_logtype, RTE_LOG_NOTICE);
 712 }