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