drivers/net/virtio/virtio_user_ethdev.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2016 Intel Corporation
   3  */
   4
   5 #include <stdint.h>
   6 #include <sys/types.h>
   7 #include <unistd.h>
   8 #include <fcntl.h>
   9 #include <sys/socket.h>
  10
  11 #include <rte_malloc.h>
  12 #include <rte_kvargs.h>
  13 #include <rte_ethdev_vdev.h>
  14 #include <rte_bus_vdev.h>
  15 #include <rte_alarm.h>
  16
  17 #include "virtio_ethdev.h"
  18 #include "virtio_logs.h"
  19 #include "virtio_pci.h"
  20 #include "virtqueue.h"
  21 #include "virtio_rxtx.h"
  22 #include "virtio_user/virtio_user_dev.h"
  23
  24 #define virtio_user_get_dev(hw) \
  25         ((struct virtio_user_dev *)(hw)->virtio_user_dev)
  26
  27 static int
  28 virtio_user_server_reconnect(struct virtio_user_dev *dev)
  29 {
  30         int ret;
  31         int connectfd;
  32         struct rte_eth_dev *eth_dev = &rte_eth_devices[dev->port_id];
  33
  34         connectfd = accept(dev->listenfd, NULL, NULL);
  35         if (connectfd < 0)
  36                 return -1;
  37
  38         dev->vhostfd = connectfd;
  39         if (dev->ops->send_request(dev, VHOST_USER_GET_FEATURES,
  40                                    &dev->device_features) < 0) {
  41                 PMD_INIT_LOG(ERR, "get_features failed: %s",
  42                              strerror(errno));
  43                 return -1;
  44         }
  45
  46         dev->device_features |= dev->frontend_features;
  47
  48         /* umask vhost-user unsupported features */
  49         dev->device_features &= ~(dev->unsupported_features);
  50
  51         dev->features &= dev->device_features;
  52
  53         ret = virtio_user_start_device(dev);
  54         if (ret < 0)
  55                 return -1;
  56
  57         if (dev->queue_pairs > 1) {
  58                 ret = virtio_user_handle_mq(dev, dev->queue_pairs);
  59                 if (ret != 0) {
  60                         PMD_INIT_LOG(ERR, "Fails to enable multi-queue pairs!");
  61                         return -1;
  62                 }
  63         }
  64         if (eth_dev->data->dev_flags & RTE_ETH_DEV_INTR_LSC) {
  65                 if (rte_intr_disable(eth_dev->intr_handle) < 0) {
  66                         PMD_DRV_LOG(ERR, "interrupt disable failed");
  67                         return -1;
  68                 }
  69                 rte_intr_callback_unregister(eth_dev->intr_handle,
  70                                              virtio_interrupt_handler,
  71                                              eth_dev);
  72                 eth_dev->intr_handle->fd = connectfd;
  73                 rte_intr_callback_register(eth_dev->intr_handle,
  74                                            virtio_interrupt_handler, eth_dev);
  75
  76                 if (rte_intr_enable(eth_dev->intr_handle) < 0) {
  77                         PMD_DRV_LOG(ERR, "interrupt enable failed");
  78                         return -1;
  79                 }
  80         }
  81         PMD_INIT_LOG(NOTICE, "server mode virtio-user reconnection succeeds!");
  82         return 0;
  83 }
  84
  85 static void
  86 virtio_user_delayed_handler(void *param)
  87 {
  88         struct virtio_hw *hw = (struct virtio_hw *)param;
  89         struct rte_eth_dev *eth_dev = &rte_eth_devices[hw->port_id];
  90         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
  91
  92         if (rte_intr_disable(eth_dev->intr_handle) < 0) {
  93                 PMD_DRV_LOG(ERR, "interrupt disable failed");
  94                 return;
  95         }
  96         rte_intr_callback_unregister(eth_dev->intr_handle,
  97                                      virtio_interrupt_handler, eth_dev);
  98         if (dev->is_server) {
  99                 if (dev->vhostfd >= 0) {
 100                         close(dev->vhostfd);
 101                         dev->vhostfd = -1;
 102                 }
 103                 eth_dev->intr_handle->fd = dev->listenfd;
 104                 rte_intr_callback_register(eth_dev->intr_handle,
 105                                            virtio_interrupt_handler, eth_dev);
 106                 if (rte_intr_enable(eth_dev->intr_handle) < 0) {
 107                         PMD_DRV_LOG(ERR, "interrupt enable failed");
 108                         return;
 109                 }
 110         }
 111 }
 112
 113 static void
 114 virtio_user_read_dev_config(struct virtio_hw *hw, size_t offset,
 115                      void *dst, int length)
 116 {
 117         int i;
 118         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 119
 120         if (offset == offsetof(struct virtio_net_config, mac) &&
 121             length == ETHER_ADDR_LEN) {
 122                 for (i = 0; i < ETHER_ADDR_LEN; ++i)
 123                         ((uint8_t *)dst)[i] = dev->mac_addr[i];
 124                 return;
 125         }
 126
 127         if (offset == offsetof(struct virtio_net_config, status)) {
 128                 char buf[128];
 129
 130                 if (dev->vhostfd >= 0) {
 131                         int r;
 132                         int flags;
 133
 134                         flags = fcntl(dev->vhostfd, F_GETFL);
 135                         if (fcntl(dev->vhostfd, F_SETFL,
 136                                         flags | O_NONBLOCK) == -1) {
 137                                 PMD_DRV_LOG(ERR, "error setting O_NONBLOCK flag");
 138                                 return;
 139                         }
 140                         r = recv(dev->vhostfd, buf, 128, MSG_PEEK);
 141                         if (r == 0 || (r < 0 && errno != EAGAIN)) {
 142                                 dev->status &= (~VIRTIO_NET_S_LINK_UP);
 143                                 PMD_DRV_LOG(ERR, "virtio-user port %u is down",
 144                                             hw->port_id);
 145
 146                                 /* This function could be called in the process
 147                                  * of interrupt handling, callback cannot be
 148                                  * unregistered here, set an alarm to do it.
 149                                  */
 150                                 rte_eal_alarm_set(1,
 151                                                   virtio_user_delayed_handler,
 152                                                   (void *)hw);
 153                         } else {
 154                                 dev->status |= VIRTIO_NET_S_LINK_UP;
 155                         }
 156                         if (fcntl(dev->vhostfd, F_SETFL,
 157                                         flags & ~O_NONBLOCK) == -1) {
 158                                 PMD_DRV_LOG(ERR, "error clearing O_NONBLOCK flag");
 159                                 return;
 160                         }
 161                 } else if (dev->is_server) {
 162                         dev->status &= (~VIRTIO_NET_S_LINK_UP);
 163                         if (virtio_user_server_reconnect(dev) >= 0)
 164                                 dev->status |= VIRTIO_NET_S_LINK_UP;
 165                 }
 166
 167                 *(uint16_t *)dst = dev->status;
 168         }
 169
 170         if (offset == offsetof(struct virtio_net_config, max_virtqueue_pairs))
 171                 *(uint16_t *)dst = dev->max_queue_pairs;
 172 }
 173
 174 static void
 175 virtio_user_write_dev_config(struct virtio_hw *hw, size_t offset,
 176                       const void *src, int length)
 177 {
 178         int i;
 179         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 180
 181         if ((offset == offsetof(struct virtio_net_config, mac)) &&
 182             (length == ETHER_ADDR_LEN))
 183                 for (i = 0; i < ETHER_ADDR_LEN; ++i)
 184                         dev->mac_addr[i] = ((const uint8_t *)src)[i];
 185         else
 186                 PMD_DRV_LOG(ERR, "not supported offset=%zu, len=%d",
 187                             offset, length);
 188 }
 189
 190 static void
 191 virtio_user_reset(struct virtio_hw *hw)
 192 {
 193         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 194
 195         if (dev->status & VIRTIO_CONFIG_STATUS_DRIVER_OK)
 196                 virtio_user_stop_device(dev);
 197 }
 198
 199 static void
 200 virtio_user_set_status(struct virtio_hw *hw, uint8_t status)
 201 {
 202         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 203
 204         if (status & VIRTIO_CONFIG_STATUS_DRIVER_OK)
 205                 virtio_user_start_device(dev);
 206         else if (status == VIRTIO_CONFIG_STATUS_RESET)
 207                 virtio_user_reset(hw);
 208         dev->status = status;
 209 }
 210
 211 static uint8_t
 212 virtio_user_get_status(struct virtio_hw *hw)
 213 {
 214         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 215
 216         return dev->status;
 217 }
 218
 219 static uint64_t
 220 virtio_user_get_features(struct virtio_hw *hw)
 221 {
 222         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 223
 224         /* unmask feature bits defined in vhost user protocol */
 225         return dev->device_features & VIRTIO_PMD_SUPPORTED_GUEST_FEATURES;
 226 }
 227
 228 static void
 229 virtio_user_set_features(struct virtio_hw *hw, uint64_t features)
 230 {
 231         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 232
 233         dev->features = features & dev->device_features;
 234 }
 235
 236 static uint8_t
 237 virtio_user_get_isr(struct virtio_hw *hw __rte_unused)
 238 {
 239         /* rxq interrupts and config interrupt are separated in virtio-user,
 240          * here we only report config change.
 241          */
 242         return VIRTIO_PCI_ISR_CONFIG;
 243 }
 244
 245 static uint16_t
 246 virtio_user_set_config_irq(struct virtio_hw *hw __rte_unused,
 247                     uint16_t vec __rte_unused)
 248 {
 249         return 0;
 250 }
 251
 252 static uint16_t
 253 virtio_user_set_queue_irq(struct virtio_hw *hw __rte_unused,
 254                           struct virtqueue *vq __rte_unused,
 255                           uint16_t vec)
 256 {
 257         /* pretend we have done that */
 258         return vec;
 259 }
 260
 261 /* This function is to get the queue size, aka, number of descs, of a specified
 262  * queue. Different with the VHOST_USER_GET_QUEUE_NUM, which is used to get the
 263  * max supported queues.
 264  */
 265 static uint16_t
 266 virtio_user_get_queue_num(struct virtio_hw *hw, uint16_t queue_id __rte_unused)
 267 {
 268         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 269
 270         /* Currently, each queue has same queue size */
 271         return dev->queue_size;
 272 }
 273
 274 static void
 275 virtio_user_setup_queue_packed(struct virtqueue *vq,
 276                                struct virtio_user_dev *dev)
 277 {
 278         uint16_t queue_idx = vq->vq_queue_index;
 279         struct vring_packed *vring;
 280         uint64_t desc_addr;
 281         uint64_t avail_addr;
 282         uint64_t used_addr;
 283         uint16_t i;
 284
 285         vring  = &dev->packed_vrings[queue_idx];
 286         desc_addr = (uintptr_t)vq->vq_ring_virt_mem;
 287         avail_addr = desc_addr + vq->vq_nentries *
 288                 sizeof(struct vring_packed_desc);
 289         used_addr = RTE_ALIGN_CEIL(avail_addr +
 290                            sizeof(struct vring_packed_desc_event),
 291                            VIRTIO_PCI_VRING_ALIGN);
 292         vring->num = vq->vq_nentries;
 293         vring->desc_packed =
 294                 (void *)(uintptr_t)desc_addr;
 295         vring->driver_event =
 296                 (void *)(uintptr_t)avail_addr;
 297         vring->device_event =
 298                 (void *)(uintptr_t)used_addr;
 299         dev->packed_queues[queue_idx].avail_wrap_counter = true;
 300         dev->packed_queues[queue_idx].used_wrap_counter = true;
 301
 302         for (i = 0; i < vring->num; i++)
 303                 vring->desc_packed[i].flags = 0;
 304 }
 305
 306 static void
 307 virtio_user_setup_queue_split(struct virtqueue *vq, struct virtio_user_dev *dev)
 308 {
 309         uint16_t queue_idx = vq->vq_queue_index;
 310         uint64_t desc_addr, avail_addr, used_addr;
 311
 312         desc_addr = (uintptr_t)vq->vq_ring_virt_mem;
 313         avail_addr = desc_addr + vq->vq_nentries * sizeof(struct vring_desc);
 314         used_addr = RTE_ALIGN_CEIL(avail_addr + offsetof(struct vring_avail,
 315                                                          ring[vq->vq_nentries]),
 316                                    VIRTIO_PCI_VRING_ALIGN);
 317
 318         dev->vrings[queue_idx].num = vq->vq_nentries;
 319         dev->vrings[queue_idx].desc = (void *)(uintptr_t)desc_addr;
 320         dev->vrings[queue_idx].avail = (void *)(uintptr_t)avail_addr;
 321         dev->vrings[queue_idx].used = (void *)(uintptr_t)used_addr;
 322 }
 323
 324 static int
 325 virtio_user_setup_queue(struct virtio_hw *hw, struct virtqueue *vq)
 326 {
 327         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 328
 329         if (vtpci_packed_queue(hw))
 330                 virtio_user_setup_queue_packed(vq, dev);
 331         else
 332                 virtio_user_setup_queue_split(vq, dev);
 333
 334         return 0;
 335 }
 336
 337 static void
 338 virtio_user_del_queue(struct virtio_hw *hw, struct virtqueue *vq)
 339 {
 340         /* For legacy devices, write 0 to VIRTIO_PCI_QUEUE_PFN port, QEMU
 341          * correspondingly stops the ioeventfds, and reset the status of
 342          * the device.
 343          * For modern devices, set queue desc, avail, used in PCI bar to 0,
 344          * not see any more behavior in QEMU.
 345          *
 346          * Here we just care about what information to deliver to vhost-user
 347          * or vhost-kernel. So we just close ioeventfd for now.
 348          */
 349         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 350
 351         close(dev->callfds[vq->vq_queue_index]);
 352         close(dev->kickfds[vq->vq_queue_index]);
 353 }
 354
 355 static void
 356 virtio_user_notify_queue(struct virtio_hw *hw, struct virtqueue *vq)
 357 {
 358         uint64_t buf = 1;
 359         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 360
 361         if (hw->cvq && (hw->cvq->vq == vq)) {
 362                 if (vtpci_packed_queue(vq->hw))
 363                         virtio_user_handle_cq_packed(dev, vq->vq_queue_index);
 364                 else
 365                         virtio_user_handle_cq(dev, vq->vq_queue_index);
 366                 return;
 367         }
 368
 369         if (write(dev->kickfds[vq->vq_queue_index], &buf, sizeof(buf)) < 0)
 370                 PMD_DRV_LOG(ERR, "failed to kick backend: %s",
 371                             strerror(errno));
 372 }
 373
 374 const struct virtio_pci_ops virtio_user_ops = {
 375         .read_dev_cfg   = virtio_user_read_dev_config,
 376         .write_dev_cfg  = virtio_user_write_dev_config,
 377         .get_status     = virtio_user_get_status,
 378         .set_status     = virtio_user_set_status,
 379         .get_features   = virtio_user_get_features,
 380         .set_features   = virtio_user_set_features,
 381         .get_isr        = virtio_user_get_isr,
 382         .set_config_irq = virtio_user_set_config_irq,
 383         .set_queue_irq  = virtio_user_set_queue_irq,
 384         .get_queue_num  = virtio_user_get_queue_num,
 385         .setup_queue    = virtio_user_setup_queue,
 386         .del_queue      = virtio_user_del_queue,
 387         .notify_queue   = virtio_user_notify_queue,
 388 };
 389
 390 static const char *valid_args[] = {
 391 #define VIRTIO_USER_ARG_QUEUES_NUM     "queues"
 392         VIRTIO_USER_ARG_QUEUES_NUM,
 393 #define VIRTIO_USER_ARG_CQ_NUM         "cq"
 394         VIRTIO_USER_ARG_CQ_NUM,
 395 #define VIRTIO_USER_ARG_MAC            "mac"
 396         VIRTIO_USER_ARG_MAC,
 397 #define VIRTIO_USER_ARG_PATH           "path"
 398         VIRTIO_USER_ARG_PATH,
 399 #define VIRTIO_USER_ARG_QUEUE_SIZE     "queue_size"
 400         VIRTIO_USER_ARG_QUEUE_SIZE,
 401 #define VIRTIO_USER_ARG_INTERFACE_NAME "iface"
 402         VIRTIO_USER_ARG_INTERFACE_NAME,
 403 #define VIRTIO_USER_ARG_SERVER_MODE    "server"
 404         VIRTIO_USER_ARG_SERVER_MODE,
 405 #define VIRTIO_USER_ARG_MRG_RXBUF      "mrg_rxbuf"
 406         VIRTIO_USER_ARG_MRG_RXBUF,
 407 #define VIRTIO_USER_ARG_IN_ORDER       "in_order"
 408         VIRTIO_USER_ARG_IN_ORDER,
 409 #define VIRTIO_USER_ARG_PACKED_VQ      "packed_vq"
 410         VIRTIO_USER_ARG_PACKED_VQ,
 411         NULL
 412 };
 413
 414 #define VIRTIO_USER_DEF_CQ_EN   0
 415 #define VIRTIO_USER_DEF_Q_NUM   1
 416 #define VIRTIO_USER_DEF_Q_SZ    256
 417 #define VIRTIO_USER_DEF_SERVER_MODE     0
 418
 419 static int
 420 get_string_arg(const char *key __rte_unused,
 421                const char *value, void *extra_args)
 422 {
 423         if (!value || !extra_args)
 424                 return -EINVAL;
 425
 426         *(char **)extra_args = strdup(value);
 427
 428         if (!*(char **)extra_args)
 429                 return -ENOMEM;
 430
 431         return 0;
 432 }
 433
 434 static int
 435 get_integer_arg(const char *key __rte_unused,
 436                 const char *value, void *extra_args)
 437 {
 438         if (!value || !extra_args)
 439                 return -EINVAL;
 440
 441         *(uint64_t *)extra_args = strtoull(value, NULL, 0);
 442
 443         return 0;
 444 }
 445
 446 static struct rte_vdev_driver virtio_user_driver;
 447
 448 static struct rte_eth_dev *
 449 virtio_user_eth_dev_alloc(struct rte_vdev_device *vdev)
 450 {
 451         struct rte_eth_dev *eth_dev;
 452         struct rte_eth_dev_data *data;
 453         struct virtio_hw *hw;
 454         struct virtio_user_dev *dev;
 455
 456         eth_dev = rte_eth_vdev_allocate(vdev, sizeof(*hw));
 457         if (!eth_dev) {
 458                 PMD_INIT_LOG(ERR, "cannot alloc rte_eth_dev");
 459                 return NULL;
 460         }
 461
 462         data = eth_dev->data;
 463         hw = eth_dev->data->dev_private;
 464
 465         dev = rte_zmalloc(NULL, sizeof(*dev), 0);
 466         if (!dev) {
 467                 PMD_INIT_LOG(ERR, "malloc virtio_user_dev failed");
 468                 rte_eth_dev_release_port(eth_dev);
 469                 return NULL;
 470         }
 471
 472         hw->port_id = data->port_id;
 473         dev->port_id = data->port_id;
 474         virtio_hw_internal[hw->port_id].vtpci_ops = &virtio_user_ops;
 475         /*
 476          * MSIX is required to enable LSC (see virtio_init_device).
 477          * Here just pretend that we support msix.
 478          */
 479         hw->use_msix = 1;
 480         hw->modern   = 0;
 481         hw->use_simple_rx = 0;
 482         hw->use_inorder_rx = 0;
 483         hw->use_inorder_tx = 0;
 484         hw->virtio_user_dev = dev;
 485         return eth_dev;
 486 }
 487
 488 static void
 489 virtio_user_eth_dev_free(struct rte_eth_dev *eth_dev)
 490 {
 491         struct rte_eth_dev_data *data = eth_dev->data;
 492         struct virtio_hw *hw = data->dev_private;
 493
 494         rte_free(hw->virtio_user_dev);
 495         rte_eth_dev_release_port(eth_dev);
 496 }
 497
 498 /* Dev initialization routine. Invoked once for each virtio vdev at
 499  * EAL init time, see rte_bus_probe().
 500  * Returns 0 on success.
 501  */
 502 static int
 503 virtio_user_pmd_probe(struct rte_vdev_device *dev)
 504 {
 505         struct rte_kvargs *kvlist = NULL;
 506         struct rte_eth_dev *eth_dev;
 507         struct virtio_hw *hw;
 508         uint64_t queues = VIRTIO_USER_DEF_Q_NUM;
 509         uint64_t cq = VIRTIO_USER_DEF_CQ_EN;
 510         uint64_t queue_size = VIRTIO_USER_DEF_Q_SZ;
 511         uint64_t server_mode = VIRTIO_USER_DEF_SERVER_MODE;
 512         uint64_t mrg_rxbuf = 1;
 513         uint64_t in_order = 1;
 514         uint64_t packed_vq = 0;
 515         char *path = NULL;
 516         char *ifname = NULL;
 517         char *mac_addr = NULL;
 518         int ret = -1;
 519
 520         kvlist = rte_kvargs_parse(rte_vdev_device_args(dev), valid_args);
 521         if (!kvlist) {
 522                 PMD_INIT_LOG(ERR, "error when parsing param");
 523                 goto end;
 524         }
 525
 526         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_PATH) == 1) {
 527                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_PATH,
 528                                        &get_string_arg, &path) < 0) {
 529                         PMD_INIT_LOG(ERR, "error to parse %s",
 530                                      VIRTIO_USER_ARG_PATH);
 531                         goto end;
 532                 }
 533         } else {
 534                 PMD_INIT_LOG(ERR, "arg %s is mandatory for virtio_user",
 535                              VIRTIO_USER_ARG_PATH);
 536                 goto end;
 537         }
 538
 539         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_INTERFACE_NAME) == 1) {
 540                 if (is_vhost_user_by_type(path)) {
 541                         PMD_INIT_LOG(ERR,
 542                                 "arg %s applies only to vhost-kernel backend",
 543                                 VIRTIO_USER_ARG_INTERFACE_NAME);
 544                         goto end;
 545                 }
 546
 547                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_INTERFACE_NAME,
 548                                        &get_string_arg, &ifname) < 0) {
 549                         PMD_INIT_LOG(ERR, "error to parse %s",
 550                                      VIRTIO_USER_ARG_INTERFACE_NAME);
 551                         goto end;
 552                 }
 553         }
 554
 555         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_MAC) == 1) {
 556                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_MAC,
 557                                        &get_string_arg, &mac_addr) < 0) {
 558                         PMD_INIT_LOG(ERR, "error to parse %s",
 559                                      VIRTIO_USER_ARG_MAC);
 560                         goto end;
 561                 }
 562         }
 563
 564         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_QUEUE_SIZE) == 1) {
 565                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_QUEUE_SIZE,
 566                                        &get_integer_arg, &queue_size) < 0) {
 567                         PMD_INIT_LOG(ERR, "error to parse %s",
 568                                      VIRTIO_USER_ARG_QUEUE_SIZE);
 569                         goto end;
 570                 }
 571         }
 572
 573         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_QUEUES_NUM) == 1) {
 574                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_QUEUES_NUM,
 575                                        &get_integer_arg, &queues) < 0) {
 576                         PMD_INIT_LOG(ERR, "error to parse %s",
 577                                      VIRTIO_USER_ARG_QUEUES_NUM);
 578                         goto end;
 579                 }
 580         }
 581
 582         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_SERVER_MODE) == 1) {
 583                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_SERVER_MODE,
 584                                        &get_integer_arg, &server_mode) < 0) {
 585                         PMD_INIT_LOG(ERR, "error to parse %s",
 586                                      VIRTIO_USER_ARG_SERVER_MODE);
 587                         goto end;
 588                 }
 589         }
 590
 591         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_CQ_NUM) == 1) {
 592                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_CQ_NUM,
 593                                        &get_integer_arg, &cq) < 0) {
 594                         PMD_INIT_LOG(ERR, "error to parse %s",
 595                                      VIRTIO_USER_ARG_CQ_NUM);
 596                         goto end;
 597                 }
 598         } else if (queues > 1) {
 599                 cq = 1;
 600         }
 601
 602         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_PACKED_VQ) == 1) {
 603                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_PACKED_VQ,
 604                                        &get_integer_arg, &packed_vq) < 0) {
 605                         PMD_INIT_LOG(ERR, "error to parse %s",
 606                                      VIRTIO_USER_ARG_PACKED_VQ);
 607                         goto end;
 608                 }
 609         }
 610
 611         if (queues > 1 && cq == 0) {
 612                 PMD_INIT_LOG(ERR, "multi-q requires ctrl-q");
 613                 goto end;
 614         }
 615
 616         if (queues > VIRTIO_MAX_VIRTQUEUE_PAIRS) {
 617                 PMD_INIT_LOG(ERR, "arg %s %" PRIu64 " exceeds the limit %u",
 618                         VIRTIO_USER_ARG_QUEUES_NUM, queues,
 619                         VIRTIO_MAX_VIRTQUEUE_PAIRS);
 620                 goto end;
 621         }
 622
 623         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_MRG_RXBUF) == 1) {
 624                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_MRG_RXBUF,
 625                                        &get_integer_arg, &mrg_rxbuf) < 0) {
 626                         PMD_INIT_LOG(ERR, "error to parse %s",
 627                                      VIRTIO_USER_ARG_MRG_RXBUF);
 628                         goto end;
 629                 }
 630         }
 631
 632         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_IN_ORDER) == 1) {
 633                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_IN_ORDER,
 634                                        &get_integer_arg, &in_order) < 0) {
 635                         PMD_INIT_LOG(ERR, "error to parse %s",
 636                                      VIRTIO_USER_ARG_IN_ORDER);
 637                         goto end;
 638                 }
 639         }
 640
 641         if (rte_eal_process_type() == RTE_PROC_PRIMARY) {
 642                 struct virtio_user_dev *vu_dev;
 643
 644                 eth_dev = virtio_user_eth_dev_alloc(dev);
 645                 if (!eth_dev) {
 646                         PMD_INIT_LOG(ERR, "virtio_user fails to alloc device");
 647                         goto end;
 648                 }
 649
 650                 hw = eth_dev->data->dev_private;
 651                 vu_dev = virtio_user_get_dev(hw);
 652                 if (server_mode == 1)
 653                         vu_dev->is_server = true;
 654                 else
 655                         vu_dev->is_server = false;
 656                 if (virtio_user_dev_init(hw->virtio_user_dev, path, queues, cq,
 657                                  queue_size, mac_addr, &ifname, mrg_rxbuf,
 658                                  in_order, packed_vq) < 0) {
 659                         PMD_INIT_LOG(ERR, "virtio_user_dev_init fails");
 660                         virtio_user_eth_dev_free(eth_dev);
 661                         goto end;
 662                 }
 663
 664         } else {
 665                 eth_dev = rte_eth_dev_attach_secondary(rte_vdev_device_name(dev));
 666                 if (!eth_dev)
 667                         goto end;
 668         }
 669
 670         /* previously called by rte_pci_probe() for physical dev */
 671         if (eth_virtio_dev_init(eth_dev) < 0) {
 672                 PMD_INIT_LOG(ERR, "eth_virtio_dev_init fails");
 673                 virtio_user_eth_dev_free(eth_dev);
 674                 goto end;
 675         }
 676
 677         rte_eth_dev_probing_finish(eth_dev);
 678         ret = 0;
 679
 680 end:
 681         if (kvlist)
 682                 rte_kvargs_free(kvlist);
 683         if (path)
 684                 free(path);
 685         if (mac_addr)
 686                 free(mac_addr);
 687         if (ifname)
 688                 free(ifname);
 689         return ret;
 690 }
 691
 692 static int
 693 virtio_user_pmd_remove(struct rte_vdev_device *vdev)
 694 {
 695         const char *name;
 696         struct rte_eth_dev *eth_dev;
 697         struct virtio_hw *hw;
 698         struct virtio_user_dev *dev;
 699
 700         if (!vdev)
 701                 return -EINVAL;
 702
 703         name = rte_vdev_device_name(vdev);
 704         PMD_DRV_LOG(INFO, "Un-Initializing %s", name);
 705         eth_dev = rte_eth_dev_allocated(name);
 706         if (!eth_dev)
 707                 return -ENODEV;
 708
 709         /* make sure the device is stopped, queues freed */
 710         rte_eth_dev_close(eth_dev->data->port_id);
 711
 712         hw = eth_dev->data->dev_private;
 713         dev = hw->virtio_user_dev;
 714         virtio_user_dev_uninit(dev);
 715
 716         rte_eth_dev_release_port(eth_dev);
 717
 718         return 0;
 719 }
 720
 721 static struct rte_vdev_driver virtio_user_driver = {
 722         .probe = virtio_user_pmd_probe,
 723         .remove = virtio_user_pmd_remove,
 724 };
 725
 726 RTE_PMD_REGISTER_VDEV(net_virtio_user, virtio_user_driver);
 727 RTE_PMD_REGISTER_ALIAS(net_virtio_user, virtio_user);
 728 RTE_PMD_REGISTER_PARAM_STRING(net_virtio_user,
 729         "path=<path> "
 730         "mac=<mac addr> "
 731         "cq=<int> "
 732         "queue_size=<int> "
 733         "queues=<int> "
 734         "iface=<string> "
 735         "server=<0|1> "
 736         "mrg_rxbuf=<0|1> "
 737         "in_order=<0|1> "
 738         "packed_vq=<0|1>");