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            (vtpci_get_status(hw) & VIRTIO_CONFIG_STATUS_DRIVER_OK)) {
  94                 PMD_INIT_LOG(NOTICE, "Packets on the fly will be dropped"
  95                                 " when packed ring reconnecting.");
  96                 virtio_user_reset_queues_packed(eth_dev);
  97         }
  98
  99         ret = virtio_user_start_device(dev);
 100         if (ret < 0)
 101                 return -1;
 102
 103         if (dev->queue_pairs > 1) {
 104                 ret = virtio_user_handle_mq(dev, dev->queue_pairs);
 105                 if (ret != 0) {
 106                         PMD_INIT_LOG(ERR, "Fails to enable multi-queue pairs!");
 107                         return -1;
 108                 }
 109         }
 110         if (eth_dev->data->dev_flags & RTE_ETH_DEV_INTR_LSC) {
 111                 if (rte_intr_disable(eth_dev->intr_handle) < 0) {
 112                         PMD_DRV_LOG(ERR, "interrupt disable failed");
 113                         return -1;
 114                 }
 115                 rte_intr_callback_unregister(eth_dev->intr_handle,
 116                                              virtio_interrupt_handler,
 117                                              eth_dev);
 118                 eth_dev->intr_handle->fd = connectfd;
 119                 rte_intr_callback_register(eth_dev->intr_handle,
 120                                            virtio_interrupt_handler, eth_dev);
 121
 122                 if (rte_intr_enable(eth_dev->intr_handle) < 0) {
 123                         PMD_DRV_LOG(ERR, "interrupt enable failed");
 124                         return -1;
 125                 }
 126         }
 127         PMD_INIT_LOG(NOTICE, "server mode virtio-user reconnection succeeds!");
 128         return 0;
 129 }
 130
 131 static void
 132 virtio_user_delayed_handler(void *param)
 133 {
 134         struct virtio_hw *hw = (struct virtio_hw *)param;
 135         struct rte_eth_dev *eth_dev = &rte_eth_devices[hw->port_id];
 136         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 137
 138         if (rte_intr_disable(eth_dev->intr_handle) < 0) {
 139                 PMD_DRV_LOG(ERR, "interrupt disable failed");
 140                 return;
 141         }
 142         rte_intr_callback_unregister(eth_dev->intr_handle,
 143                                      virtio_interrupt_handler, eth_dev);
 144         if (dev->is_server) {
 145                 if (dev->vhostfd >= 0) {
 146                         close(dev->vhostfd);
 147                         dev->vhostfd = -1;
 148                 }
 149                 eth_dev->intr_handle->fd = dev->listenfd;
 150                 rte_intr_callback_register(eth_dev->intr_handle,
 151                                            virtio_interrupt_handler, eth_dev);
 152                 if (rte_intr_enable(eth_dev->intr_handle) < 0) {
 153                         PMD_DRV_LOG(ERR, "interrupt enable failed");
 154                         return;
 155                 }
 156         }
 157 }
 158
 159 static void
 160 virtio_user_read_dev_config(struct virtio_hw *hw, size_t offset,
 161                      void *dst, int length)
 162 {
 163         int i;
 164         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 165
 166         if (offset == offsetof(struct virtio_net_config, mac) &&
 167             length == RTE_ETHER_ADDR_LEN) {
 168                 for (i = 0; i < RTE_ETHER_ADDR_LEN; ++i)
 169                         ((uint8_t *)dst)[i] = dev->mac_addr[i];
 170                 return;
 171         }
 172
 173         if (offset == offsetof(struct virtio_net_config, status)) {
 174                 char buf[128];
 175
 176                 if (dev->vhostfd >= 0) {
 177                         int r;
 178                         int flags;
 179
 180                         flags = fcntl(dev->vhostfd, F_GETFL);
 181                         if (fcntl(dev->vhostfd, F_SETFL,
 182                                         flags | O_NONBLOCK) == -1) {
 183                                 PMD_DRV_LOG(ERR, "error setting O_NONBLOCK flag");
 184                                 return;
 185                         }
 186                         r = recv(dev->vhostfd, buf, 128, MSG_PEEK);
 187                         if (r == 0 || (r < 0 && errno != EAGAIN)) {
 188                                 dev->status &= (~VIRTIO_NET_S_LINK_UP);
 189                                 PMD_DRV_LOG(ERR, "virtio-user port %u is down",
 190                                             hw->port_id);
 191
 192                                 /* This function could be called in the process
 193                                  * of interrupt handling, callback cannot be
 194                                  * unregistered here, set an alarm to do it.
 195                                  */
 196                                 rte_eal_alarm_set(1,
 197                                                   virtio_user_delayed_handler,
 198                                                   (void *)hw);
 199                         } else {
 200                                 dev->status |= VIRTIO_NET_S_LINK_UP;
 201                         }
 202                         if (fcntl(dev->vhostfd, F_SETFL,
 203                                         flags & ~O_NONBLOCK) == -1) {
 204                                 PMD_DRV_LOG(ERR, "error clearing O_NONBLOCK flag");
 205                                 return;
 206                         }
 207                 } else if (dev->is_server) {
 208                         dev->status &= (~VIRTIO_NET_S_LINK_UP);
 209                         if (virtio_user_server_reconnect(dev) >= 0)
 210                                 dev->status |= VIRTIO_NET_S_LINK_UP;
 211                 }
 212
 213                 *(uint16_t *)dst = dev->status;
 214         }
 215
 216         if (offset == offsetof(struct virtio_net_config, max_virtqueue_pairs))
 217                 *(uint16_t *)dst = dev->max_queue_pairs;
 218 }
 219
 220 static void
 221 virtio_user_write_dev_config(struct virtio_hw *hw, size_t offset,
 222                       const void *src, int length)
 223 {
 224         int i;
 225         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 226
 227         if ((offset == offsetof(struct virtio_net_config, mac)) &&
 228             (length == RTE_ETHER_ADDR_LEN))
 229                 for (i = 0; i < RTE_ETHER_ADDR_LEN; ++i)
 230                         dev->mac_addr[i] = ((const uint8_t *)src)[i];
 231         else
 232                 PMD_DRV_LOG(ERR, "not supported offset=%zu, len=%d",
 233                             offset, length);
 234 }
 235
 236 static void
 237 virtio_user_reset(struct virtio_hw *hw)
 238 {
 239         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 240
 241         if (dev->status & VIRTIO_CONFIG_STATUS_DRIVER_OK)
 242                 virtio_user_stop_device(dev);
 243 }
 244
 245 static void
 246 virtio_user_set_status(struct virtio_hw *hw, uint8_t status)
 247 {
 248         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 249
 250         if (status & VIRTIO_CONFIG_STATUS_DRIVER_OK)
 251                 virtio_user_start_device(dev);
 252         else if (status == VIRTIO_CONFIG_STATUS_RESET)
 253                 virtio_user_reset(hw);
 254         dev->status = status;
 255 }
 256
 257 static uint8_t
 258 virtio_user_get_status(struct virtio_hw *hw)
 259 {
 260         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 261
 262         return dev->status;
 263 }
 264
 265 static uint64_t
 266 virtio_user_get_features(struct virtio_hw *hw)
 267 {
 268         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 269
 270         /* unmask feature bits defined in vhost user protocol */
 271         return dev->device_features & VIRTIO_PMD_SUPPORTED_GUEST_FEATURES;
 272 }
 273
 274 static void
 275 virtio_user_set_features(struct virtio_hw *hw, uint64_t features)
 276 {
 277         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 278
 279         dev->features = features & dev->device_features;
 280 }
 281
 282 static uint8_t
 283 virtio_user_get_isr(struct virtio_hw *hw __rte_unused)
 284 {
 285         /* rxq interrupts and config interrupt are separated in virtio-user,
 286          * here we only report config change.
 287          */
 288         return VIRTIO_PCI_ISR_CONFIG;
 289 }
 290
 291 static uint16_t
 292 virtio_user_set_config_irq(struct virtio_hw *hw __rte_unused,
 293                     uint16_t vec __rte_unused)
 294 {
 295         return 0;
 296 }
 297
 298 static uint16_t
 299 virtio_user_set_queue_irq(struct virtio_hw *hw __rte_unused,
 300                           struct virtqueue *vq __rte_unused,
 301                           uint16_t vec)
 302 {
 303         /* pretend we have done that */
 304         return vec;
 305 }
 306
 307 /* This function is to get the queue size, aka, number of descs, of a specified
 308  * queue. Different with the VHOST_USER_GET_QUEUE_NUM, which is used to get the
 309  * max supported queues.
 310  */
 311 static uint16_t
 312 virtio_user_get_queue_num(struct virtio_hw *hw, uint16_t queue_id __rte_unused)
 313 {
 314         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 315
 316         /* Currently, each queue has same queue size */
 317         return dev->queue_size;
 318 }
 319
 320 static void
 321 virtio_user_setup_queue_packed(struct virtqueue *vq,
 322                                struct virtio_user_dev *dev)
 323 {
 324         uint16_t queue_idx = vq->vq_queue_index;
 325         struct vring_packed *vring;
 326         uint64_t desc_addr;
 327         uint64_t avail_addr;
 328         uint64_t used_addr;
 329         uint16_t i;
 330
 331         vring  = &dev->packed_vrings[queue_idx];
 332         desc_addr = (uintptr_t)vq->vq_ring_virt_mem;
 333         avail_addr = desc_addr + vq->vq_nentries *
 334                 sizeof(struct vring_packed_desc);
 335         used_addr = RTE_ALIGN_CEIL(avail_addr +
 336                            sizeof(struct vring_packed_desc_event),
 337                            VIRTIO_PCI_VRING_ALIGN);
 338         vring->num = vq->vq_nentries;
 339         vring->desc = (void *)(uintptr_t)desc_addr;
 340         vring->driver = (void *)(uintptr_t)avail_addr;
 341         vring->device = (void *)(uintptr_t)used_addr;
 342         dev->packed_queues[queue_idx].avail_wrap_counter = true;
 343         dev->packed_queues[queue_idx].used_wrap_counter = true;
 344
 345         for (i = 0; i < vring->num; i++)
 346                 vring->desc[i].flags = 0;
 347 }
 348
 349 static void
 350 virtio_user_setup_queue_split(struct virtqueue *vq, struct virtio_user_dev *dev)
 351 {
 352         uint16_t queue_idx = vq->vq_queue_index;
 353         uint64_t desc_addr, avail_addr, used_addr;
 354
 355         desc_addr = (uintptr_t)vq->vq_ring_virt_mem;
 356         avail_addr = desc_addr + vq->vq_nentries * sizeof(struct vring_desc);
 357         used_addr = RTE_ALIGN_CEIL(avail_addr + offsetof(struct vring_avail,
 358                                                          ring[vq->vq_nentries]),
 359                                    VIRTIO_PCI_VRING_ALIGN);
 360
 361         dev->vrings[queue_idx].num = vq->vq_nentries;
 362         dev->vrings[queue_idx].desc = (void *)(uintptr_t)desc_addr;
 363         dev->vrings[queue_idx].avail = (void *)(uintptr_t)avail_addr;
 364         dev->vrings[queue_idx].used = (void *)(uintptr_t)used_addr;
 365 }
 366
 367 static int
 368 virtio_user_setup_queue(struct virtio_hw *hw, struct virtqueue *vq)
 369 {
 370         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 371
 372         if (vtpci_packed_queue(hw))
 373                 virtio_user_setup_queue_packed(vq, dev);
 374         else
 375                 virtio_user_setup_queue_split(vq, dev);
 376
 377         return 0;
 378 }
 379
 380 static void
 381 virtio_user_del_queue(struct virtio_hw *hw, struct virtqueue *vq)
 382 {
 383         /* For legacy devices, write 0 to VIRTIO_PCI_QUEUE_PFN port, QEMU
 384          * correspondingly stops the ioeventfds, and reset the status of
 385          * the device.
 386          * For modern devices, set queue desc, avail, used in PCI bar to 0,
 387          * not see any more behavior in QEMU.
 388          *
 389          * Here we just care about what information to deliver to vhost-user
 390          * or vhost-kernel. So we just close ioeventfd for now.
 391          */
 392         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 393
 394         close(dev->callfds[vq->vq_queue_index]);
 395         close(dev->kickfds[vq->vq_queue_index]);
 396 }
 397
 398 static void
 399 virtio_user_notify_queue(struct virtio_hw *hw, struct virtqueue *vq)
 400 {
 401         uint64_t buf = 1;
 402         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 403
 404         if (hw->cvq && (hw->cvq->vq == vq)) {
 405                 if (vtpci_packed_queue(vq->hw))
 406                         virtio_user_handle_cq_packed(dev, vq->vq_queue_index);
 407                 else
 408                         virtio_user_handle_cq(dev, vq->vq_queue_index);
 409                 return;
 410         }
 411
 412         if (write(dev->kickfds[vq->vq_queue_index], &buf, sizeof(buf)) < 0)
 413                 PMD_DRV_LOG(ERR, "failed to kick backend: %s",
 414                             strerror(errno));
 415 }
 416
 417 const struct virtio_pci_ops virtio_user_ops = {
 418         .read_dev_cfg   = virtio_user_read_dev_config,
 419         .write_dev_cfg  = virtio_user_write_dev_config,
 420         .get_status     = virtio_user_get_status,
 421         .set_status     = virtio_user_set_status,
 422         .get_features   = virtio_user_get_features,
 423         .set_features   = virtio_user_set_features,
 424         .get_isr        = virtio_user_get_isr,
 425         .set_config_irq = virtio_user_set_config_irq,
 426         .set_queue_irq  = virtio_user_set_queue_irq,
 427         .get_queue_num  = virtio_user_get_queue_num,
 428         .setup_queue    = virtio_user_setup_queue,
 429         .del_queue      = virtio_user_del_queue,
 430         .notify_queue   = virtio_user_notify_queue,
 431 };
 432
 433 static const char *valid_args[] = {
 434 #define VIRTIO_USER_ARG_QUEUES_NUM     "queues"
 435         VIRTIO_USER_ARG_QUEUES_NUM,
 436 #define VIRTIO_USER_ARG_CQ_NUM         "cq"
 437         VIRTIO_USER_ARG_CQ_NUM,
 438 #define VIRTIO_USER_ARG_MAC            "mac"
 439         VIRTIO_USER_ARG_MAC,
 440 #define VIRTIO_USER_ARG_PATH           "path"
 441         VIRTIO_USER_ARG_PATH,
 442 #define VIRTIO_USER_ARG_QUEUE_SIZE     "queue_size"
 443         VIRTIO_USER_ARG_QUEUE_SIZE,
 444 #define VIRTIO_USER_ARG_INTERFACE_NAME "iface"
 445         VIRTIO_USER_ARG_INTERFACE_NAME,
 446 #define VIRTIO_USER_ARG_SERVER_MODE    "server"
 447         VIRTIO_USER_ARG_SERVER_MODE,
 448 #define VIRTIO_USER_ARG_MRG_RXBUF      "mrg_rxbuf"
 449         VIRTIO_USER_ARG_MRG_RXBUF,
 450 #define VIRTIO_USER_ARG_IN_ORDER       "in_order"
 451         VIRTIO_USER_ARG_IN_ORDER,
 452 #define VIRTIO_USER_ARG_PACKED_VQ      "packed_vq"
 453         VIRTIO_USER_ARG_PACKED_VQ,
 454 #define VIRTIO_USER_ARG_SPEED          "speed"
 455         VIRTIO_USER_ARG_SPEED,
 456 #define VIRTIO_USER_ARG_VECTORIZED     "vectorized"
 457         VIRTIO_USER_ARG_VECTORIZED,
 458         NULL
 459 };
 460
 461 #define VIRTIO_USER_DEF_CQ_EN   0
 462 #define VIRTIO_USER_DEF_Q_NUM   1
 463 #define VIRTIO_USER_DEF_Q_SZ    256
 464 #define VIRTIO_USER_DEF_SERVER_MODE     0
 465
 466 static int
 467 get_string_arg(const char *key __rte_unused,
 468                const char *value, void *extra_args)
 469 {
 470         if (!value || !extra_args)
 471                 return -EINVAL;
 472
 473         *(char **)extra_args = strdup(value);
 474
 475         if (!*(char **)extra_args)
 476                 return -ENOMEM;
 477
 478         return 0;
 479 }
 480
 481 static int
 482 get_integer_arg(const char *key __rte_unused,
 483                 const char *value, void *extra_args)
 484 {
 485         uint64_t integer = 0;
 486         if (!value || !extra_args)
 487                 return -EINVAL;
 488         errno = 0;
 489         integer = strtoull(value, NULL, 0);
 490         /* extra_args keeps default value, it should be replaced
 491          * only in case of successful parsing of the 'value' arg
 492          */
 493         if (errno == 0)
 494                 *(uint64_t *)extra_args = integer;
 495         return -errno;
 496 }
 497
 498 static struct rte_eth_dev *
 499 virtio_user_eth_dev_alloc(struct rte_vdev_device *vdev)
 500 {
 501         struct rte_eth_dev *eth_dev;
 502         struct rte_eth_dev_data *data;
 503         struct virtio_hw *hw;
 504         struct virtio_user_dev *dev;
 505
 506         eth_dev = rte_eth_vdev_allocate(vdev, sizeof(*hw));
 507         if (!eth_dev) {
 508                 PMD_INIT_LOG(ERR, "cannot alloc rte_eth_dev");
 509                 return NULL;
 510         }
 511
 512         data = eth_dev->data;
 513         hw = eth_dev->data->dev_private;
 514
 515         dev = rte_zmalloc(NULL, sizeof(*dev), 0);
 516         if (!dev) {
 517                 PMD_INIT_LOG(ERR, "malloc virtio_user_dev failed");
 518                 rte_eth_dev_release_port(eth_dev);
 519                 return NULL;
 520         }
 521
 522         hw->port_id = data->port_id;
 523         dev->port_id = data->port_id;
 524         virtio_hw_internal[hw->port_id].vtpci_ops = &virtio_user_ops;
 525         /*
 526          * MSIX is required to enable LSC (see virtio_init_device).
 527          * Here just pretend that we support msix.
 528          */
 529         hw->use_msix = 1;
 530         hw->modern   = 0;
 531         hw->use_vec_rx = 0;
 532         hw->use_vec_tx = 0;
 533         hw->use_inorder_rx = 0;
 534         hw->use_inorder_tx = 0;
 535         hw->virtio_user_dev = dev;
 536         return eth_dev;
 537 }
 538
 539 static void
 540 virtio_user_eth_dev_free(struct rte_eth_dev *eth_dev)
 541 {
 542         struct rte_eth_dev_data *data = eth_dev->data;
 543         struct virtio_hw *hw = data->dev_private;
 544
 545         rte_free(hw->virtio_user_dev);
 546         rte_eth_dev_release_port(eth_dev);
 547 }
 548
 549 /* Dev initialization routine. Invoked once for each virtio vdev at
 550  * EAL init time, see rte_bus_probe().
 551  * Returns 0 on success.
 552  */
 553 static int
 554 virtio_user_pmd_probe(struct rte_vdev_device *dev)
 555 {
 556         struct rte_kvargs *kvlist = NULL;
 557         struct rte_eth_dev *eth_dev;
 558         struct virtio_hw *hw;
 559         uint64_t queues = VIRTIO_USER_DEF_Q_NUM;
 560         uint64_t cq = VIRTIO_USER_DEF_CQ_EN;
 561         uint64_t queue_size = VIRTIO_USER_DEF_Q_SZ;
 562         uint64_t server_mode = VIRTIO_USER_DEF_SERVER_MODE;
 563         uint64_t mrg_rxbuf = 1;
 564         uint64_t in_order = 1;
 565         uint64_t packed_vq = 0;
 566         uint64_t vectorized = 0;
 567         char *path = NULL;
 568         char *ifname = NULL;
 569         char *mac_addr = NULL;
 570         int ret = -1;
 571
 572         if (rte_eal_process_type() == RTE_PROC_SECONDARY) {
 573                 const char *name = rte_vdev_device_name(dev);
 574                 eth_dev = rte_eth_dev_attach_secondary(name);
 575                 if (!eth_dev) {
 576                         PMD_INIT_LOG(ERR, "Failed to probe %s", name);
 577                         return -1;
 578                 }
 579
 580                 if (eth_virtio_dev_init(eth_dev) < 0) {
 581                         PMD_INIT_LOG(ERR, "eth_virtio_dev_init fails");
 582                         rte_eth_dev_release_port(eth_dev);
 583                         return -1;
 584                 }
 585
 586                 eth_dev->dev_ops = &virtio_user_secondary_eth_dev_ops;
 587                 eth_dev->device = &dev->device;
 588                 rte_eth_dev_probing_finish(eth_dev);
 589                 return 0;
 590         }
 591
 592         kvlist = rte_kvargs_parse(rte_vdev_device_args(dev), valid_args);
 593         if (!kvlist) {
 594                 PMD_INIT_LOG(ERR, "error when parsing param");
 595                 goto end;
 596         }
 597
 598         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_PATH) == 1) {
 599                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_PATH,
 600                                        &get_string_arg, &path) < 0) {
 601                         PMD_INIT_LOG(ERR, "error to parse %s",
 602                                      VIRTIO_USER_ARG_PATH);
 603                         goto end;
 604                 }
 605         } else {
 606                 PMD_INIT_LOG(ERR, "arg %s is mandatory for virtio_user",
 607                              VIRTIO_USER_ARG_PATH);
 608                 goto end;
 609         }
 610
 611         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_INTERFACE_NAME) == 1) {
 612                 if (is_vhost_user_by_type(path)) {
 613                         PMD_INIT_LOG(ERR,
 614                                 "arg %s applies only to vhost-kernel backend",
 615                                 VIRTIO_USER_ARG_INTERFACE_NAME);
 616                         goto end;
 617                 }
 618
 619                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_INTERFACE_NAME,
 620                                        &get_string_arg, &ifname) < 0) {
 621                         PMD_INIT_LOG(ERR, "error to parse %s",
 622                                      VIRTIO_USER_ARG_INTERFACE_NAME);
 623                         goto end;
 624                 }
 625         }
 626
 627         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_MAC) == 1) {
 628                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_MAC,
 629                                        &get_string_arg, &mac_addr) < 0) {
 630                         PMD_INIT_LOG(ERR, "error to parse %s",
 631                                      VIRTIO_USER_ARG_MAC);
 632                         goto end;
 633                 }
 634         }
 635
 636         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_QUEUE_SIZE) == 1) {
 637                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_QUEUE_SIZE,
 638                                        &get_integer_arg, &queue_size) < 0) {
 639                         PMD_INIT_LOG(ERR, "error to parse %s",
 640                                      VIRTIO_USER_ARG_QUEUE_SIZE);
 641                         goto end;
 642                 }
 643         }
 644
 645         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_QUEUES_NUM) == 1) {
 646                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_QUEUES_NUM,
 647                                        &get_integer_arg, &queues) < 0) {
 648                         PMD_INIT_LOG(ERR, "error to parse %s",
 649                                      VIRTIO_USER_ARG_QUEUES_NUM);
 650                         goto end;
 651                 }
 652         }
 653
 654         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_SERVER_MODE) == 1) {
 655                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_SERVER_MODE,
 656                                        &get_integer_arg, &server_mode) < 0) {
 657                         PMD_INIT_LOG(ERR, "error to parse %s",
 658                                      VIRTIO_USER_ARG_SERVER_MODE);
 659                         goto end;
 660                 }
 661         }
 662
 663         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_CQ_NUM) == 1) {
 664                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_CQ_NUM,
 665                                        &get_integer_arg, &cq) < 0) {
 666                         PMD_INIT_LOG(ERR, "error to parse %s",
 667                                      VIRTIO_USER_ARG_CQ_NUM);
 668                         goto end;
 669                 }
 670         } else if (queues > 1) {
 671                 cq = 1;
 672         }
 673
 674         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_PACKED_VQ) == 1) {
 675                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_PACKED_VQ,
 676                                        &get_integer_arg, &packed_vq) < 0) {
 677                         PMD_INIT_LOG(ERR, "error to parse %s",
 678                                      VIRTIO_USER_ARG_PACKED_VQ);
 679                         goto end;
 680                 }
 681         }
 682
 683         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_VECTORIZED) == 1) {
 684                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_VECTORIZED,
 685                                        &get_integer_arg, &vectorized) < 0) {
 686                         PMD_INIT_LOG(ERR, "error to parse %s",
 687                                      VIRTIO_USER_ARG_VECTORIZED);
 688                         goto end;
 689                 }
 690         }
 691
 692         if (queues > 1 && cq == 0) {
 693                 PMD_INIT_LOG(ERR, "multi-q requires ctrl-q");
 694                 goto end;
 695         }
 696
 697         if (queues > VIRTIO_MAX_VIRTQUEUE_PAIRS) {
 698                 PMD_INIT_LOG(ERR, "arg %s %" PRIu64 " exceeds the limit %u",
 699                         VIRTIO_USER_ARG_QUEUES_NUM, queues,
 700                         VIRTIO_MAX_VIRTQUEUE_PAIRS);
 701                 goto end;
 702         }
 703
 704         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_MRG_RXBUF) == 1) {
 705                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_MRG_RXBUF,
 706                                        &get_integer_arg, &mrg_rxbuf) < 0) {
 707                         PMD_INIT_LOG(ERR, "error to parse %s",
 708                                      VIRTIO_USER_ARG_MRG_RXBUF);
 709                         goto end;
 710                 }
 711         }
 712
 713         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_IN_ORDER) == 1) {
 714                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_IN_ORDER,
 715                                        &get_integer_arg, &in_order) < 0) {
 716                         PMD_INIT_LOG(ERR, "error to parse %s",
 717                                      VIRTIO_USER_ARG_IN_ORDER);
 718                         goto end;
 719                 }
 720         }
 721
 722         eth_dev = virtio_user_eth_dev_alloc(dev);
 723         if (!eth_dev) {
 724                 PMD_INIT_LOG(ERR, "virtio_user fails to alloc device");
 725                 goto end;
 726         }
 727
 728         hw = eth_dev->data->dev_private;
 729         if (virtio_user_dev_init(hw->virtio_user_dev, path, queues, cq,
 730                          queue_size, mac_addr, &ifname, server_mode,
 731                          mrg_rxbuf, in_order, packed_vq) < 0) {
 732                 PMD_INIT_LOG(ERR, "virtio_user_dev_init fails");
 733                 virtio_user_eth_dev_free(eth_dev);
 734                 goto end;
 735         }
 736
 737         /* previously called by pci probing for physical dev */
 738         if (eth_virtio_dev_init(eth_dev) < 0) {
 739                 PMD_INIT_LOG(ERR, "eth_virtio_dev_init fails");
 740                 virtio_user_eth_dev_free(eth_dev);
 741                 goto end;
 742         }
 743
 744         if (vectorized) {
 745                 if (packed_vq) {
 746 #if defined(CC_AVX512_SUPPORT)
 747                         hw->use_vec_rx = 1;
 748                         hw->use_vec_tx = 1;
 749 #else
 750                         PMD_INIT_LOG(INFO,
 751                                 "building environment do not support packed ring vectorized");
 752 #endif
 753                 } else {
 754                         hw->use_vec_rx = 1;
 755                 }
 756         }
 757
 758         rte_eth_dev_probing_finish(eth_dev);
 759         ret = 0;
 760
 761 end:
 762         if (kvlist)
 763                 rte_kvargs_free(kvlist);
 764         if (path)
 765                 free(path);
 766         if (mac_addr)
 767                 free(mac_addr);
 768         if (ifname)
 769                 free(ifname);
 770         return ret;
 771 }
 772
 773 static int
 774 virtio_user_pmd_remove(struct rte_vdev_device *vdev)
 775 {
 776         const char *name;
 777         struct rte_eth_dev *eth_dev;
 778
 779         if (!vdev)
 780                 return -EINVAL;
 781
 782         name = rte_vdev_device_name(vdev);
 783         PMD_DRV_LOG(INFO, "Un-Initializing %s", name);
 784         eth_dev = rte_eth_dev_allocated(name);
 785         /* Port has already been released by close. */
 786         if (!eth_dev)
 787                 return 0;
 788
 789         if (rte_eal_process_type() != RTE_PROC_PRIMARY)
 790                 return rte_eth_dev_release_port(eth_dev);
 791
 792         /* make sure the device is stopped, queues freed */
 793         rte_eth_dev_close(eth_dev->data->port_id);
 794
 795         return 0;
 796 }
 797
 798 static struct rte_vdev_driver virtio_user_driver = {
 799         .probe = virtio_user_pmd_probe,
 800         .remove = virtio_user_pmd_remove,
 801 };
 802
 803 RTE_PMD_REGISTER_VDEV(net_virtio_user, virtio_user_driver);
 804 RTE_PMD_REGISTER_ALIAS(net_virtio_user, virtio_user);
 805 RTE_PMD_REGISTER_PARAM_STRING(net_virtio_user,
 806         "path=<path> "
 807         "mac=<mac addr> "
 808         "cq=<int> "
 809         "queue_size=<int> "
 810         "queues=<int> "
 811         "iface=<string> "
 812         "server=<0|1> "
 813         "mrg_rxbuf=<0|1> "
 814         "in_order=<0|1> "
 815         "packed_vq=<0|1> "
 816         "speed=<int> "
 817         "vectorized=<0|1>");