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