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 #include <rte_cycles.h>
  17
  18 #include "virtio_ethdev.h"
  19 #include "virtio_logs.h"
  20 #include "virtio_pci.h"
  21 #include "virtqueue.h"
  22 #include "virtio_rxtx.h"
  23 #include "virtio_user/virtio_user_dev.h"
  24 #include "virtio_user/vhost.h"
  25
  26 #define virtio_user_get_dev(hw) \
  27         ((struct virtio_user_dev *)(hw)->virtio_user_dev)
  28
  29 static void
  30 virtio_user_reset_queues_packed(struct rte_eth_dev *dev)
  31 {
  32         struct virtio_hw *hw = dev->data->dev_private;
  33         struct virtnet_rx *rxvq;
  34         struct virtnet_tx *txvq;
  35         uint16_t i;
  36
  37         /* Add lock to avoid queue contention. */
  38         rte_spinlock_lock(&hw->state_lock);
  39         hw->started = 0;
  40
  41         /*
  42          * Waitting for datapath to complete before resetting queues.
  43          * 1 ms should be enough for the ongoing Tx/Rx function to finish.
  44          */
  45         rte_delay_ms(1);
  46
  47         /* Vring reset for each Tx queue and Rx queue. */
  48         for (i = 0; i < dev->data->nb_rx_queues; i++) {
  49                 rxvq = dev->data->rx_queues[i];
  50                 virtqueue_rxvq_reset_packed(rxvq->vq);
  51                 virtio_dev_rx_queue_setup_finish(dev, i);
  52         }
  53
  54         for (i = 0; i < dev->data->nb_tx_queues; i++) {
  55                 txvq = dev->data->tx_queues[i];
  56                 virtqueue_txvq_reset_packed(txvq->vq);
  57         }
  58
  59         hw->started = 1;
  60         rte_spinlock_unlock(&hw->state_lock);
  61 }
  62
  63
  64 static int
  65 virtio_user_server_reconnect(struct virtio_user_dev *dev)
  66 {
  67         int ret;
  68         int connectfd;
  69         struct rte_eth_dev *eth_dev = &rte_eth_devices[dev->port_id];
  70         struct virtio_hw *hw = eth_dev->data->dev_private;
  71
  72         connectfd = accept(dev->listenfd, NULL, NULL);
  73         if (connectfd < 0)
  74                 return -1;
  75
  76         dev->vhostfd = connectfd;
  77         if (dev->ops->send_request(dev, VHOST_USER_GET_FEATURES,
  78                                    &dev->device_features) < 0) {
  79                 PMD_INIT_LOG(ERR, "get_features failed: %s",
  80                              strerror(errno));
  81                 return -1;
  82         }
  83
  84         dev->device_features |= dev->frontend_features;
  85
  86         /* umask vhost-user unsupported features */
  87         dev->device_features &= ~(dev->unsupported_features);
  88
  89         dev->features &= dev->device_features;
  90
  91         /* For packed ring, resetting queues is required in reconnection. */
  92         if (vtpci_packed_queue(hw)) {
  93                 PMD_INIT_LOG(NOTICE, "Packets on the fly will be dropped"
  94                                 " when packed ring reconnecting.");
  95                 virtio_user_reset_queues_packed(eth_dev);
  96         }
  97
  98         ret = virtio_user_start_device(dev);
  99         if (ret < 0)
 100                 return -1;
 101
 102         if (dev->queue_pairs > 1) {
 103                 ret = virtio_user_handle_mq(dev, dev->queue_pairs);
 104                 if (ret != 0) {
 105                         PMD_INIT_LOG(ERR, "Fails to enable multi-queue pairs!");
 106                         return -1;
 107                 }
 108         }
 109         if (eth_dev->data->dev_flags & RTE_ETH_DEV_INTR_LSC) {
 110                 if (rte_intr_disable(eth_dev->intr_handle) < 0) {
 111                         PMD_DRV_LOG(ERR, "interrupt disable failed");
 112                         return -1;
 113                 }
 114                 rte_intr_callback_unregister(eth_dev->intr_handle,
 115                                              virtio_interrupt_handler,
 116                                              eth_dev);
 117                 eth_dev->intr_handle->fd = connectfd;
 118                 rte_intr_callback_register(eth_dev->intr_handle,
 119                                            virtio_interrupt_handler, eth_dev);
 120
 121                 if (rte_intr_enable(eth_dev->intr_handle) < 0) {
 122                         PMD_DRV_LOG(ERR, "interrupt enable failed");
 123                         return -1;
 124                 }
 125         }
 126         PMD_INIT_LOG(NOTICE, "server mode virtio-user reconnection succeeds!");
 127         return 0;
 128 }
 129
 130 static void
 131 virtio_user_delayed_handler(void *param)
 132 {
 133         struct virtio_hw *hw = (struct virtio_hw *)param;
 134         struct rte_eth_dev *eth_dev = &rte_eth_devices[hw->port_id];
 135         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 136
 137         if (rte_intr_disable(eth_dev->intr_handle) < 0) {
 138                 PMD_DRV_LOG(ERR, "interrupt disable failed");
 139                 return;
 140         }
 141         rte_intr_callback_unregister(eth_dev->intr_handle,
 142                                      virtio_interrupt_handler, eth_dev);
 143         if (dev->is_server) {
 144                 if (dev->vhostfd >= 0) {
 145                         close(dev->vhostfd);
 146                         dev->vhostfd = -1;
 147                 }
 148                 eth_dev->intr_handle->fd = dev->listenfd;
 149                 rte_intr_callback_register(eth_dev->intr_handle,
 150                                            virtio_interrupt_handler, eth_dev);
 151                 if (rte_intr_enable(eth_dev->intr_handle) < 0) {
 152                         PMD_DRV_LOG(ERR, "interrupt enable failed");
 153                         return;
 154                 }
 155         }
 156 }
 157
 158 static void
 159 virtio_user_read_dev_config(struct virtio_hw *hw, size_t offset,
 160                      void *dst, int length)
 161 {
 162         int i;
 163         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 164
 165         if (offset == offsetof(struct virtio_net_config, mac) &&
 166             length == RTE_ETHER_ADDR_LEN) {
 167                 for (i = 0; i < RTE_ETHER_ADDR_LEN; ++i)
 168                         ((uint8_t *)dst)[i] = dev->mac_addr[i];
 169                 return;
 170         }
 171
 172         if (offset == offsetof(struct virtio_net_config, status)) {
 173                 char buf[128];
 174
 175                 if (dev->vhostfd >= 0) {
 176                         int r;
 177                         int flags;
 178
 179                         flags = fcntl(dev->vhostfd, F_GETFL);
 180                         if (fcntl(dev->vhostfd, F_SETFL,
 181                                         flags | O_NONBLOCK) == -1) {
 182                                 PMD_DRV_LOG(ERR, "error setting O_NONBLOCK flag");
 183                                 return;
 184                         }
 185                         r = recv(dev->vhostfd, buf, 128, MSG_PEEK);
 186                         if (r == 0 || (r < 0 && errno != EAGAIN)) {
 187                                 dev->status &= (~VIRTIO_NET_S_LINK_UP);
 188                                 PMD_DRV_LOG(ERR, "virtio-user port %u is down",
 189                                             hw->port_id);
 190
 191                                 /* This function could be called in the process
 192                                  * of interrupt handling, callback cannot be
 193                                  * unregistered here, set an alarm to do it.
 194                                  */
 195                                 rte_eal_alarm_set(1,
 196                                                   virtio_user_delayed_handler,
 197                                                   (void *)hw);
 198                         } else {
 199                                 dev->status |= VIRTIO_NET_S_LINK_UP;
 200                         }
 201                         if (fcntl(dev->vhostfd, F_SETFL,
 202                                         flags & ~O_NONBLOCK) == -1) {
 203                                 PMD_DRV_LOG(ERR, "error clearing O_NONBLOCK flag");
 204                                 return;
 205                         }
 206                 } else if (dev->is_server) {
 207                         dev->status &= (~VIRTIO_NET_S_LINK_UP);
 208                         if (virtio_user_server_reconnect(dev) >= 0)
 209                                 dev->status |= VIRTIO_NET_S_LINK_UP;
 210                 }
 211
 212                 *(uint16_t *)dst = dev->status;
 213         }
 214
 215         if (offset == offsetof(struct virtio_net_config, max_virtqueue_pairs))
 216                 *(uint16_t *)dst = dev->max_queue_pairs;
 217 }
 218
 219 static void
 220 virtio_user_write_dev_config(struct virtio_hw *hw, size_t offset,
 221                       const void *src, int length)
 222 {
 223         int i;
 224         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 225
 226         if ((offset == offsetof(struct virtio_net_config, mac)) &&
 227             (length == RTE_ETHER_ADDR_LEN))
 228                 for (i = 0; i < RTE_ETHER_ADDR_LEN; ++i)
 229                         dev->mac_addr[i] = ((const uint8_t *)src)[i];
 230         else
 231                 PMD_DRV_LOG(ERR, "not supported offset=%zu, len=%d",
 232                             offset, length);
 233 }
 234
 235 static void
 236 virtio_user_reset(struct virtio_hw *hw)
 237 {
 238         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 239
 240         if (dev->status & VIRTIO_CONFIG_STATUS_DRIVER_OK)
 241                 virtio_user_stop_device(dev);
 242 }
 243
 244 static void
 245 virtio_user_set_status(struct virtio_hw *hw, uint8_t status)
 246 {
 247         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 248
 249         if (status & VIRTIO_CONFIG_STATUS_DRIVER_OK)
 250                 virtio_user_start_device(dev);
 251         else if (status == VIRTIO_CONFIG_STATUS_RESET)
 252                 virtio_user_reset(hw);
 253         dev->status = status;
 254 }
 255
 256 static uint8_t
 257 virtio_user_get_status(struct virtio_hw *hw)
 258 {
 259         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 260
 261         return dev->status;
 262 }
 263
 264 static uint64_t
 265 virtio_user_get_features(struct virtio_hw *hw)
 266 {
 267         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 268
 269         /* unmask feature bits defined in vhost user protocol */
 270         return dev->device_features & VIRTIO_PMD_SUPPORTED_GUEST_FEATURES;
 271 }
 272
 273 static void
 274 virtio_user_set_features(struct virtio_hw *hw, uint64_t features)
 275 {
 276         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 277
 278         dev->features = features & dev->device_features;
 279 }
 280
 281 static uint8_t
 282 virtio_user_get_isr(struct virtio_hw *hw __rte_unused)
 283 {
 284         /* rxq interrupts and config interrupt are separated in virtio-user,
 285          * here we only report config change.
 286          */
 287         return VIRTIO_PCI_ISR_CONFIG;
 288 }
 289
 290 static uint16_t
 291 virtio_user_set_config_irq(struct virtio_hw *hw __rte_unused,
 292                     uint16_t vec __rte_unused)
 293 {
 294         return 0;
 295 }
 296
 297 static uint16_t
 298 virtio_user_set_queue_irq(struct virtio_hw *hw __rte_unused,
 299                           struct virtqueue *vq __rte_unused,
 300                           uint16_t vec)
 301 {
 302         /* pretend we have done that */
 303         return vec;
 304 }
 305
 306 /* This function is to get the queue size, aka, number of descs, of a specified
 307  * queue. Different with the VHOST_USER_GET_QUEUE_NUM, which is used to get the
 308  * max supported queues.
 309  */
 310 static uint16_t
 311 virtio_user_get_queue_num(struct virtio_hw *hw, uint16_t queue_id __rte_unused)
 312 {
 313         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 314
 315         /* Currently, each queue has same queue size */
 316         return dev->queue_size;
 317 }
 318
 319 static void
 320 virtio_user_setup_queue_packed(struct virtqueue *vq,
 321                                struct virtio_user_dev *dev)
 322 {
 323         uint16_t queue_idx = vq->vq_queue_index;
 324         struct vring_packed *vring;
 325         uint64_t desc_addr;
 326         uint64_t avail_addr;
 327         uint64_t used_addr;
 328         uint16_t i;
 329
 330         vring  = &dev->packed_vrings[queue_idx];
 331         desc_addr = (uintptr_t)vq->vq_ring_virt_mem;
 332         avail_addr = desc_addr + vq->vq_nentries *
 333                 sizeof(struct vring_packed_desc);
 334         used_addr = RTE_ALIGN_CEIL(avail_addr +
 335                            sizeof(struct vring_packed_desc_event),
 336                            VIRTIO_PCI_VRING_ALIGN);
 337         vring->num = vq->vq_nentries;
 338         vring->desc = (void *)(uintptr_t)desc_addr;
 339         vring->driver = (void *)(uintptr_t)avail_addr;
 340         vring->device = (void *)(uintptr_t)used_addr;
 341         dev->packed_queues[queue_idx].avail_wrap_counter = true;
 342         dev->packed_queues[queue_idx].used_wrap_counter = true;
 343
 344         for (i = 0; i < vring->num; i++)
 345                 vring->desc[i].flags = 0;
 346 }
 347
 348 static void
 349 virtio_user_setup_queue_split(struct virtqueue *vq, struct virtio_user_dev *dev)
 350 {
 351         uint16_t queue_idx = vq->vq_queue_index;
 352         uint64_t desc_addr, avail_addr, used_addr;
 353
 354         desc_addr = (uintptr_t)vq->vq_ring_virt_mem;
 355         avail_addr = desc_addr + vq->vq_nentries * sizeof(struct vring_desc);
 356         used_addr = RTE_ALIGN_CEIL(avail_addr + offsetof(struct vring_avail,
 357                                                          ring[vq->vq_nentries]),
 358                                    VIRTIO_PCI_VRING_ALIGN);
 359
 360         dev->vrings[queue_idx].num = vq->vq_nentries;
 361         dev->vrings[queue_idx].desc = (void *)(uintptr_t)desc_addr;
 362         dev->vrings[queue_idx].avail = (void *)(uintptr_t)avail_addr;
 363         dev->vrings[queue_idx].used = (void *)(uintptr_t)used_addr;
 364 }
 365
 366 static int
 367 virtio_user_setup_queue(struct virtio_hw *hw, struct virtqueue *vq)
 368 {
 369         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 370
 371         if (vtpci_packed_queue(hw))
 372                 virtio_user_setup_queue_packed(vq, dev);
 373         else
 374                 virtio_user_setup_queue_split(vq, dev);
 375
 376         return 0;
 377 }
 378
 379 static void
 380 virtio_user_del_queue(struct virtio_hw *hw, struct virtqueue *vq)
 381 {
 382         /* For legacy devices, write 0 to VIRTIO_PCI_QUEUE_PFN port, QEMU
 383          * correspondingly stops the ioeventfds, and reset the status of
 384          * the device.
 385          * For modern devices, set queue desc, avail, used in PCI bar to 0,
 386          * not see any more behavior in QEMU.
 387          *
 388          * Here we just care about what information to deliver to vhost-user
 389          * or vhost-kernel. So we just close ioeventfd for now.
 390          */
 391         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 392
 393         close(dev->callfds[vq->vq_queue_index]);
 394         close(dev->kickfds[vq->vq_queue_index]);
 395 }
 396
 397 static void
 398 virtio_user_notify_queue(struct virtio_hw *hw, struct virtqueue *vq)
 399 {
 400         uint64_t buf = 1;
 401         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 402
 403         if (hw->cvq && (hw->cvq->vq == vq)) {
 404                 if (vtpci_packed_queue(vq->hw))
 405                         virtio_user_handle_cq_packed(dev, vq->vq_queue_index);
 406                 else
 407                         virtio_user_handle_cq(dev, vq->vq_queue_index);
 408                 return;
 409         }
 410
 411         if (write(dev->kickfds[vq->vq_queue_index], &buf, sizeof(buf)) < 0)
 412                 PMD_DRV_LOG(ERR, "failed to kick backend: %s",
 413                             strerror(errno));
 414 }
 415
 416 const struct virtio_pci_ops virtio_user_ops = {
 417         .read_dev_cfg   = virtio_user_read_dev_config,
 418         .write_dev_cfg  = virtio_user_write_dev_config,
 419         .get_status     = virtio_user_get_status,
 420         .set_status     = virtio_user_set_status,
 421         .get_features   = virtio_user_get_features,
 422         .set_features   = virtio_user_set_features,
 423         .get_isr        = virtio_user_get_isr,
 424         .set_config_irq = virtio_user_set_config_irq,
 425         .set_queue_irq  = virtio_user_set_queue_irq,
 426         .get_queue_num  = virtio_user_get_queue_num,
 427         .setup_queue    = virtio_user_setup_queue,
 428         .del_queue      = virtio_user_del_queue,
 429         .notify_queue   = virtio_user_notify_queue,
 430 };
 431
 432 static const char *valid_args[] = {
 433 #define VIRTIO_USER_ARG_QUEUES_NUM     "queues"
 434         VIRTIO_USER_ARG_QUEUES_NUM,
 435 #define VIRTIO_USER_ARG_CQ_NUM         "cq"
 436         VIRTIO_USER_ARG_CQ_NUM,
 437 #define VIRTIO_USER_ARG_MAC            "mac"
 438         VIRTIO_USER_ARG_MAC,
 439 #define VIRTIO_USER_ARG_PATH           "path"
 440         VIRTIO_USER_ARG_PATH,
 441 #define VIRTIO_USER_ARG_QUEUE_SIZE     "queue_size"
 442         VIRTIO_USER_ARG_QUEUE_SIZE,
 443 #define VIRTIO_USER_ARG_INTERFACE_NAME "iface"
 444         VIRTIO_USER_ARG_INTERFACE_NAME,
 445 #define VIRTIO_USER_ARG_SERVER_MODE    "server"
 446         VIRTIO_USER_ARG_SERVER_MODE,
 447 #define VIRTIO_USER_ARG_MRG_RXBUF      "mrg_rxbuf"
 448         VIRTIO_USER_ARG_MRG_RXBUF,
 449 #define VIRTIO_USER_ARG_IN_ORDER       "in_order"
 450         VIRTIO_USER_ARG_IN_ORDER,
 451 #define VIRTIO_USER_ARG_PACKED_VQ      "packed_vq"
 452         VIRTIO_USER_ARG_PACKED_VQ,
 453         NULL
 454 };
 455
 456 #define VIRTIO_USER_DEF_CQ_EN   0
 457 #define VIRTIO_USER_DEF_Q_NUM   1
 458 #define VIRTIO_USER_DEF_Q_SZ    256
 459 #define VIRTIO_USER_DEF_SERVER_MODE     0
 460
 461 static int
 462 get_string_arg(const char *key __rte_unused,
 463                const char *value, void *extra_args)
 464 {
 465         if (!value || !extra_args)
 466                 return -EINVAL;
 467
 468         *(char **)extra_args = strdup(value);
 469
 470         if (!*(char **)extra_args)
 471                 return -ENOMEM;
 472
 473         return 0;
 474 }
 475
 476 static int
 477 get_integer_arg(const char *key __rte_unused,
 478                 const char *value, void *extra_args)
 479 {
 480         uint64_t integer = 0;
 481         if (!value || !extra_args)
 482                 return -EINVAL;
 483         errno = 0;
 484         integer = strtoull(value, NULL, 0);
 485         /* extra_args keeps default value, it should be replaced
 486          * only in case of successful parsing of the 'value' arg
 487          */
 488         if (errno == 0)
 489                 *(uint64_t *)extra_args = integer;
 490         return -errno;
 491 }
 492
 493 static struct rte_eth_dev *
 494 virtio_user_eth_dev_alloc(struct rte_vdev_device *vdev)
 495 {
 496         struct rte_eth_dev *eth_dev;
 497         struct rte_eth_dev_data *data;
 498         struct virtio_hw *hw;
 499         struct virtio_user_dev *dev;
 500
 501         eth_dev = rte_eth_vdev_allocate(vdev, sizeof(*hw));
 502         if (!eth_dev) {
 503                 PMD_INIT_LOG(ERR, "cannot alloc rte_eth_dev");
 504                 return NULL;
 505         }
 506
 507         data = eth_dev->data;
 508         hw = eth_dev->data->dev_private;
 509
 510         dev = rte_zmalloc(NULL, sizeof(*dev), 0);
 511         if (!dev) {
 512                 PMD_INIT_LOG(ERR, "malloc virtio_user_dev failed");
 513                 rte_eth_dev_release_port(eth_dev);
 514                 return NULL;
 515         }
 516
 517         hw->port_id = data->port_id;
 518         dev->port_id = data->port_id;
 519         virtio_hw_internal[hw->port_id].vtpci_ops = &virtio_user_ops;
 520         /*
 521          * MSIX is required to enable LSC (see virtio_init_device).
 522          * Here just pretend that we support msix.
 523          */
 524         hw->use_msix = 1;
 525         hw->modern   = 0;
 526         hw->use_simple_rx = 0;
 527         hw->use_inorder_rx = 0;
 528         hw->use_inorder_tx = 0;
 529         hw->virtio_user_dev = dev;
 530         return eth_dev;
 531 }
 532
 533 static void
 534 virtio_user_eth_dev_free(struct rte_eth_dev *eth_dev)
 535 {
 536         struct rte_eth_dev_data *data = eth_dev->data;
 537         struct virtio_hw *hw = data->dev_private;
 538
 539         rte_free(hw->virtio_user_dev);
 540         rte_eth_dev_release_port(eth_dev);
 541 }
 542
 543 /* Dev initialization routine. Invoked once for each virtio vdev at
 544  * EAL init time, see rte_bus_probe().
 545  * Returns 0 on success.
 546  */
 547 static int
 548 virtio_user_pmd_probe(struct rte_vdev_device *dev)
 549 {
 550         struct rte_kvargs *kvlist = NULL;
 551         struct rte_eth_dev *eth_dev;
 552         struct virtio_hw *hw;
 553         uint64_t queues = VIRTIO_USER_DEF_Q_NUM;
 554         uint64_t cq = VIRTIO_USER_DEF_CQ_EN;
 555         uint64_t queue_size = VIRTIO_USER_DEF_Q_SZ;
 556         uint64_t server_mode = VIRTIO_USER_DEF_SERVER_MODE;
 557         uint64_t mrg_rxbuf = 1;
 558         uint64_t in_order = 1;
 559         uint64_t packed_vq = 0;
 560         char *path = NULL;
 561         char *ifname = NULL;
 562         char *mac_addr = NULL;
 563         int ret = -1;
 564
 565         if (rte_eal_process_type() == RTE_PROC_SECONDARY) {
 566                 const char *name = rte_vdev_device_name(dev);
 567                 eth_dev = rte_eth_dev_attach_secondary(name);
 568                 if (!eth_dev) {
 569                         PMD_INIT_LOG(ERR, "Failed to probe %s", name);
 570                         return -1;
 571                 }
 572
 573                 if (eth_virtio_dev_init(eth_dev) < 0) {
 574                         PMD_INIT_LOG(ERR, "eth_virtio_dev_init fails");
 575                         rte_eth_dev_release_port(eth_dev);
 576                         return -1;
 577                 }
 578
 579                 eth_dev->dev_ops = &virtio_user_secondary_eth_dev_ops;
 580                 eth_dev->device = &dev->device;
 581                 rte_eth_dev_probing_finish(eth_dev);
 582                 return 0;
 583         }
 584
 585         kvlist = rte_kvargs_parse(rte_vdev_device_args(dev), valid_args);
 586         if (!kvlist) {
 587                 PMD_INIT_LOG(ERR, "error when parsing param");
 588                 goto end;
 589         }
 590
 591         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_PATH) == 1) {
 592                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_PATH,
 593                                        &get_string_arg, &path) < 0) {
 594                         PMD_INIT_LOG(ERR, "error to parse %s",
 595                                      VIRTIO_USER_ARG_PATH);
 596                         goto end;
 597                 }
 598         } else {
 599                 PMD_INIT_LOG(ERR, "arg %s is mandatory for virtio_user",
 600                              VIRTIO_USER_ARG_PATH);
 601                 goto end;
 602         }
 603
 604         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_INTERFACE_NAME) == 1) {
 605                 if (is_vhost_user_by_type(path)) {
 606                         PMD_INIT_LOG(ERR,
 607                                 "arg %s applies only to vhost-kernel backend",
 608                                 VIRTIO_USER_ARG_INTERFACE_NAME);
 609                         goto end;
 610                 }
 611
 612                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_INTERFACE_NAME,
 613                                        &get_string_arg, &ifname) < 0) {
 614                         PMD_INIT_LOG(ERR, "error to parse %s",
 615                                      VIRTIO_USER_ARG_INTERFACE_NAME);
 616                         goto end;
 617                 }
 618         }
 619
 620         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_MAC) == 1) {
 621                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_MAC,
 622                                        &get_string_arg, &mac_addr) < 0) {
 623                         PMD_INIT_LOG(ERR, "error to parse %s",
 624                                      VIRTIO_USER_ARG_MAC);
 625                         goto end;
 626                 }
 627         }
 628
 629         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_QUEUE_SIZE) == 1) {
 630                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_QUEUE_SIZE,
 631                                        &get_integer_arg, &queue_size) < 0) {
 632                         PMD_INIT_LOG(ERR, "error to parse %s",
 633                                      VIRTIO_USER_ARG_QUEUE_SIZE);
 634                         goto end;
 635                 }
 636         }
 637
 638         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_QUEUES_NUM) == 1) {
 639                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_QUEUES_NUM,
 640                                        &get_integer_arg, &queues) < 0) {
 641                         PMD_INIT_LOG(ERR, "error to parse %s",
 642                                      VIRTIO_USER_ARG_QUEUES_NUM);
 643                         goto end;
 644                 }
 645         }
 646
 647         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_SERVER_MODE) == 1) {
 648                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_SERVER_MODE,
 649                                        &get_integer_arg, &server_mode) < 0) {
 650                         PMD_INIT_LOG(ERR, "error to parse %s",
 651                                      VIRTIO_USER_ARG_SERVER_MODE);
 652                         goto end;
 653                 }
 654         }
 655
 656         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_CQ_NUM) == 1) {
 657                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_CQ_NUM,
 658                                        &get_integer_arg, &cq) < 0) {
 659                         PMD_INIT_LOG(ERR, "error to parse %s",
 660                                      VIRTIO_USER_ARG_CQ_NUM);
 661                         goto end;
 662                 }
 663         } else if (queues > 1) {
 664                 cq = 1;
 665         }
 666
 667         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_PACKED_VQ) == 1) {
 668                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_PACKED_VQ,
 669                                        &get_integer_arg, &packed_vq) < 0) {
 670                         PMD_INIT_LOG(ERR, "error to parse %s",
 671                                      VIRTIO_USER_ARG_PACKED_VQ);
 672                         goto end;
 673                 }
 674         }
 675
 676         if (queues > 1 && cq == 0) {
 677                 PMD_INIT_LOG(ERR, "multi-q requires ctrl-q");
 678                 goto end;
 679         }
 680
 681         if (queues > VIRTIO_MAX_VIRTQUEUE_PAIRS) {
 682                 PMD_INIT_LOG(ERR, "arg %s %" PRIu64 " exceeds the limit %u",
 683                         VIRTIO_USER_ARG_QUEUES_NUM, queues,
 684                         VIRTIO_MAX_VIRTQUEUE_PAIRS);
 685                 goto end;
 686         }
 687
 688         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_MRG_RXBUF) == 1) {
 689                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_MRG_RXBUF,
 690                                        &get_integer_arg, &mrg_rxbuf) < 0) {
 691                         PMD_INIT_LOG(ERR, "error to parse %s",
 692                                      VIRTIO_USER_ARG_MRG_RXBUF);
 693                         goto end;
 694                 }
 695         }
 696
 697         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_IN_ORDER) == 1) {
 698                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_IN_ORDER,
 699                                        &get_integer_arg, &in_order) < 0) {
 700                         PMD_INIT_LOG(ERR, "error to parse %s",
 701                                      VIRTIO_USER_ARG_IN_ORDER);
 702                         goto end;
 703                 }
 704         }
 705
 706         eth_dev = virtio_user_eth_dev_alloc(dev);
 707         if (!eth_dev) {
 708                 PMD_INIT_LOG(ERR, "virtio_user fails to alloc device");
 709                 goto end;
 710         }
 711
 712         hw = eth_dev->data->dev_private;
 713         if (virtio_user_dev_init(hw->virtio_user_dev, path, queues, cq,
 714                          queue_size, mac_addr, &ifname, server_mode,
 715                          mrg_rxbuf, in_order, packed_vq) < 0) {
 716                 PMD_INIT_LOG(ERR, "virtio_user_dev_init fails");
 717                 virtio_user_eth_dev_free(eth_dev);
 718                 goto end;
 719         }
 720
 721         /* previously called by rte_pci_probe() for physical dev */
 722         if (eth_virtio_dev_init(eth_dev) < 0) {
 723                 PMD_INIT_LOG(ERR, "eth_virtio_dev_init fails");
 724                 virtio_user_eth_dev_free(eth_dev);
 725                 goto end;
 726         }
 727
 728         rte_eth_dev_probing_finish(eth_dev);
 729         ret = 0;
 730
 731 end:
 732         if (kvlist)
 733                 rte_kvargs_free(kvlist);
 734         if (path)
 735                 free(path);
 736         if (mac_addr)
 737                 free(mac_addr);
 738         if (ifname)
 739                 free(ifname);
 740         return ret;
 741 }
 742
 743 static int
 744 virtio_user_pmd_remove(struct rte_vdev_device *vdev)
 745 {
 746         const char *name;
 747         struct rte_eth_dev *eth_dev;
 748
 749         if (!vdev)
 750                 return -EINVAL;
 751
 752         name = rte_vdev_device_name(vdev);
 753         PMD_DRV_LOG(INFO, "Un-Initializing %s", name);
 754         eth_dev = rte_eth_dev_allocated(name);
 755         /* Port has already been released by close. */
 756         if (!eth_dev)
 757                 return 0;
 758
 759         if (rte_eal_process_type() != RTE_PROC_PRIMARY)
 760                 return rte_eth_dev_release_port(eth_dev);
 761
 762         /* make sure the device is stopped, queues freed */
 763         rte_eth_dev_close(eth_dev->data->port_id);
 764
 765         return 0;
 766 }
 767
 768 static struct rte_vdev_driver virtio_user_driver = {
 769         .probe = virtio_user_pmd_probe,
 770         .remove = virtio_user_pmd_remove,
 771 };
 772
 773 RTE_PMD_REGISTER_VDEV(net_virtio_user, virtio_user_driver);
 774 RTE_PMD_REGISTER_ALIAS(net_virtio_user, virtio_user);
 775 RTE_PMD_REGISTER_PARAM_STRING(net_virtio_user,
 776         "path=<path> "
 777         "mac=<mac addr> "
 778         "cq=<int> "
 779         "queue_size=<int> "
 780         "queues=<int> "
 781         "iface=<string> "
 782         "server=<0|1> "
 783         "mrg_rxbuf=<0|1> "
 784         "in_order=<0|1> "
 785         "packed_vq=<0|1>");