drivers/net/virtio/virtio_user_ethdev.c

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