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         uint16_t queue_idx = vq->vq_queue_index;
 279         struct vring_packed *vring;
 280         uint64_t desc_addr;
 281         uint64_t avail_addr;
 282         uint64_t used_addr;
 283         uint16_t i;
 284
 285         vring  = &dev->packed_vrings[queue_idx];
 286         desc_addr = (uintptr_t)vq->vq_ring_virt_mem;
 287         avail_addr = desc_addr + vq->vq_nentries *
 288                 sizeof(struct vring_packed_desc);
 289         used_addr = RTE_ALIGN_CEIL(avail_addr +
 290                            sizeof(struct vring_packed_desc_event),
 291                            VIRTIO_PCI_VRING_ALIGN);
 292         vring->num = vq->vq_nentries;
 293         vring->desc = (void *)(uintptr_t)desc_addr;
 294         vring->driver = (void *)(uintptr_t)avail_addr;
 295         vring->device = (void *)(uintptr_t)used_addr;
 296         dev->packed_queues[queue_idx].avail_wrap_counter = true;
 297         dev->packed_queues[queue_idx].used_wrap_counter = true;
 298
 299         for (i = 0; i < vring->num; i++)
 300                 vring->desc[i].flags = 0;
 301 }
 302
 303 static void
 304 virtio_user_setup_queue_split(struct virtqueue *vq, struct virtio_user_dev *dev)
 305 {
 306         uint16_t queue_idx = vq->vq_queue_index;
 307         uint64_t desc_addr, avail_addr, used_addr;
 308
 309         desc_addr = (uintptr_t)vq->vq_ring_virt_mem;
 310         avail_addr = desc_addr + vq->vq_nentries * sizeof(struct vring_desc);
 311         used_addr = RTE_ALIGN_CEIL(avail_addr + offsetof(struct vring_avail,
 312                                                          ring[vq->vq_nentries]),
 313                                    VIRTIO_PCI_VRING_ALIGN);
 314
 315         dev->vrings[queue_idx].num = vq->vq_nentries;
 316         dev->vrings[queue_idx].desc = (void *)(uintptr_t)desc_addr;
 317         dev->vrings[queue_idx].avail = (void *)(uintptr_t)avail_addr;
 318         dev->vrings[queue_idx].used = (void *)(uintptr_t)used_addr;
 319 }
 320
 321 static int
 322 virtio_user_setup_queue(struct virtio_hw *hw, struct virtqueue *vq)
 323 {
 324         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 325
 326         if (vtpci_packed_queue(hw))
 327                 virtio_user_setup_queue_packed(vq, dev);
 328         else
 329                 virtio_user_setup_queue_split(vq, dev);
 330
 331         return 0;
 332 }
 333
 334 static void
 335 virtio_user_del_queue(struct virtio_hw *hw, struct virtqueue *vq)
 336 {
 337         /* For legacy devices, write 0 to VIRTIO_PCI_QUEUE_PFN port, QEMU
 338          * correspondingly stops the ioeventfds, and reset the status of
 339          * the device.
 340          * For modern devices, set queue desc, avail, used in PCI bar to 0,
 341          * not see any more behavior in QEMU.
 342          *
 343          * Here we just care about what information to deliver to vhost-user
 344          * or vhost-kernel. So we just close ioeventfd for now.
 345          */
 346         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 347
 348         close(dev->callfds[vq->vq_queue_index]);
 349         close(dev->kickfds[vq->vq_queue_index]);
 350 }
 351
 352 static void
 353 virtio_user_notify_queue(struct virtio_hw *hw, struct virtqueue *vq)
 354 {
 355         uint64_t buf = 1;
 356         struct virtio_user_dev *dev = virtio_user_get_dev(hw);
 357
 358         if (hw->cvq && (hw->cvq->vq == vq)) {
 359                 if (vtpci_packed_queue(vq->hw))
 360                         virtio_user_handle_cq_packed(dev, vq->vq_queue_index);
 361                 else
 362                         virtio_user_handle_cq(dev, vq->vq_queue_index);
 363                 return;
 364         }
 365
 366         if (write(dev->kickfds[vq->vq_queue_index], &buf, sizeof(buf)) < 0)
 367                 PMD_DRV_LOG(ERR, "failed to kick backend: %s",
 368                             strerror(errno));
 369 }
 370
 371 const struct virtio_pci_ops virtio_user_ops = {
 372         .read_dev_cfg   = virtio_user_read_dev_config,
 373         .write_dev_cfg  = virtio_user_write_dev_config,
 374         .get_status     = virtio_user_get_status,
 375         .set_status     = virtio_user_set_status,
 376         .get_features   = virtio_user_get_features,
 377         .set_features   = virtio_user_set_features,
 378         .get_isr        = virtio_user_get_isr,
 379         .set_config_irq = virtio_user_set_config_irq,
 380         .set_queue_irq  = virtio_user_set_queue_irq,
 381         .get_queue_num  = virtio_user_get_queue_num,
 382         .setup_queue    = virtio_user_setup_queue,
 383         .del_queue      = virtio_user_del_queue,
 384         .notify_queue   = virtio_user_notify_queue,
 385 };
 386
 387 static const char *valid_args[] = {
 388 #define VIRTIO_USER_ARG_QUEUES_NUM     "queues"
 389         VIRTIO_USER_ARG_QUEUES_NUM,
 390 #define VIRTIO_USER_ARG_CQ_NUM         "cq"
 391         VIRTIO_USER_ARG_CQ_NUM,
 392 #define VIRTIO_USER_ARG_MAC            "mac"
 393         VIRTIO_USER_ARG_MAC,
 394 #define VIRTIO_USER_ARG_PATH           "path"
 395         VIRTIO_USER_ARG_PATH,
 396 #define VIRTIO_USER_ARG_QUEUE_SIZE     "queue_size"
 397         VIRTIO_USER_ARG_QUEUE_SIZE,
 398 #define VIRTIO_USER_ARG_INTERFACE_NAME "iface"
 399         VIRTIO_USER_ARG_INTERFACE_NAME,
 400 #define VIRTIO_USER_ARG_SERVER_MODE    "server"
 401         VIRTIO_USER_ARG_SERVER_MODE,
 402 #define VIRTIO_USER_ARG_MRG_RXBUF      "mrg_rxbuf"
 403         VIRTIO_USER_ARG_MRG_RXBUF,
 404 #define VIRTIO_USER_ARG_IN_ORDER       "in_order"
 405         VIRTIO_USER_ARG_IN_ORDER,
 406 #define VIRTIO_USER_ARG_PACKED_VQ      "packed_vq"
 407         VIRTIO_USER_ARG_PACKED_VQ,
 408         NULL
 409 };
 410
 411 #define VIRTIO_USER_DEF_CQ_EN   0
 412 #define VIRTIO_USER_DEF_Q_NUM   1
 413 #define VIRTIO_USER_DEF_Q_SZ    256
 414 #define VIRTIO_USER_DEF_SERVER_MODE     0
 415
 416 static int
 417 get_string_arg(const char *key __rte_unused,
 418                const char *value, void *extra_args)
 419 {
 420         if (!value || !extra_args)
 421                 return -EINVAL;
 422
 423         *(char **)extra_args = strdup(value);
 424
 425         if (!*(char **)extra_args)
 426                 return -ENOMEM;
 427
 428         return 0;
 429 }
 430
 431 static int
 432 get_integer_arg(const char *key __rte_unused,
 433                 const char *value, void *extra_args)
 434 {
 435         if (!value || !extra_args)
 436                 return -EINVAL;
 437
 438         *(uint64_t *)extra_args = strtoull(value, NULL, 0);
 439
 440         return 0;
 441 }
 442
 443 static struct rte_vdev_driver virtio_user_driver;
 444
 445 static struct rte_eth_dev *
 446 virtio_user_eth_dev_alloc(struct rte_vdev_device *vdev)
 447 {
 448         struct rte_eth_dev *eth_dev;
 449         struct rte_eth_dev_data *data;
 450         struct virtio_hw *hw;
 451         struct virtio_user_dev *dev;
 452
 453         eth_dev = rte_eth_vdev_allocate(vdev, sizeof(*hw));
 454         if (!eth_dev) {
 455                 PMD_INIT_LOG(ERR, "cannot alloc rte_eth_dev");
 456                 return NULL;
 457         }
 458
 459         data = eth_dev->data;
 460         hw = eth_dev->data->dev_private;
 461
 462         dev = rte_zmalloc(NULL, sizeof(*dev), 0);
 463         if (!dev) {
 464                 PMD_INIT_LOG(ERR, "malloc virtio_user_dev failed");
 465                 rte_eth_dev_release_port(eth_dev);
 466                 return NULL;
 467         }
 468
 469         hw->port_id = data->port_id;
 470         dev->port_id = data->port_id;
 471         virtio_hw_internal[hw->port_id].vtpci_ops = &virtio_user_ops;
 472         /*
 473          * MSIX is required to enable LSC (see virtio_init_device).
 474          * Here just pretend that we support msix.
 475          */
 476         hw->use_msix = 1;
 477         hw->modern   = 0;
 478         hw->use_simple_rx = 0;
 479         hw->use_inorder_rx = 0;
 480         hw->use_inorder_tx = 0;
 481         hw->virtio_user_dev = dev;
 482         return eth_dev;
 483 }
 484
 485 static void
 486 virtio_user_eth_dev_free(struct rte_eth_dev *eth_dev)
 487 {
 488         struct rte_eth_dev_data *data = eth_dev->data;
 489         struct virtio_hw *hw = data->dev_private;
 490
 491         rte_free(hw->virtio_user_dev);
 492         rte_eth_dev_release_port(eth_dev);
 493 }
 494
 495 /* Dev initialization routine. Invoked once for each virtio vdev at
 496  * EAL init time, see rte_bus_probe().
 497  * Returns 0 on success.
 498  */
 499 static int
 500 virtio_user_pmd_probe(struct rte_vdev_device *dev)
 501 {
 502         struct rte_kvargs *kvlist = NULL;
 503         struct rte_eth_dev *eth_dev;
 504         struct virtio_hw *hw;
 505         uint64_t queues = VIRTIO_USER_DEF_Q_NUM;
 506         uint64_t cq = VIRTIO_USER_DEF_CQ_EN;
 507         uint64_t queue_size = VIRTIO_USER_DEF_Q_SZ;
 508         uint64_t server_mode = VIRTIO_USER_DEF_SERVER_MODE;
 509         uint64_t mrg_rxbuf = 1;
 510         uint64_t in_order = 1;
 511         uint64_t packed_vq = 0;
 512         char *path = NULL;
 513         char *ifname = NULL;
 514         char *mac_addr = NULL;
 515         int ret = -1;
 516
 517         kvlist = rte_kvargs_parse(rte_vdev_device_args(dev), valid_args);
 518         if (!kvlist) {
 519                 PMD_INIT_LOG(ERR, "error when parsing param");
 520                 goto end;
 521         }
 522
 523         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_PATH) == 1) {
 524                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_PATH,
 525                                        &get_string_arg, &path) < 0) {
 526                         PMD_INIT_LOG(ERR, "error to parse %s",
 527                                      VIRTIO_USER_ARG_PATH);
 528                         goto end;
 529                 }
 530         } else {
 531                 PMD_INIT_LOG(ERR, "arg %s is mandatory for virtio_user",
 532                              VIRTIO_USER_ARG_PATH);
 533                 goto end;
 534         }
 535
 536         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_INTERFACE_NAME) == 1) {
 537                 if (is_vhost_user_by_type(path)) {
 538                         PMD_INIT_LOG(ERR,
 539                                 "arg %s applies only to vhost-kernel backend",
 540                                 VIRTIO_USER_ARG_INTERFACE_NAME);
 541                         goto end;
 542                 }
 543
 544                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_INTERFACE_NAME,
 545                                        &get_string_arg, &ifname) < 0) {
 546                         PMD_INIT_LOG(ERR, "error to parse %s",
 547                                      VIRTIO_USER_ARG_INTERFACE_NAME);
 548                         goto end;
 549                 }
 550         }
 551
 552         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_MAC) == 1) {
 553                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_MAC,
 554                                        &get_string_arg, &mac_addr) < 0) {
 555                         PMD_INIT_LOG(ERR, "error to parse %s",
 556                                      VIRTIO_USER_ARG_MAC);
 557                         goto end;
 558                 }
 559         }
 560
 561         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_QUEUE_SIZE) == 1) {
 562                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_QUEUE_SIZE,
 563                                        &get_integer_arg, &queue_size) < 0) {
 564                         PMD_INIT_LOG(ERR, "error to parse %s",
 565                                      VIRTIO_USER_ARG_QUEUE_SIZE);
 566                         goto end;
 567                 }
 568         }
 569
 570         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_QUEUES_NUM) == 1) {
 571                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_QUEUES_NUM,
 572                                        &get_integer_arg, &queues) < 0) {
 573                         PMD_INIT_LOG(ERR, "error to parse %s",
 574                                      VIRTIO_USER_ARG_QUEUES_NUM);
 575                         goto end;
 576                 }
 577         }
 578
 579         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_SERVER_MODE) == 1) {
 580                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_SERVER_MODE,
 581                                        &get_integer_arg, &server_mode) < 0) {
 582                         PMD_INIT_LOG(ERR, "error to parse %s",
 583                                      VIRTIO_USER_ARG_SERVER_MODE);
 584                         goto end;
 585                 }
 586         }
 587
 588         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_CQ_NUM) == 1) {
 589                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_CQ_NUM,
 590                                        &get_integer_arg, &cq) < 0) {
 591                         PMD_INIT_LOG(ERR, "error to parse %s",
 592                                      VIRTIO_USER_ARG_CQ_NUM);
 593                         goto end;
 594                 }
 595         } else if (queues > 1) {
 596                 cq = 1;
 597         }
 598
 599         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_PACKED_VQ) == 1) {
 600                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_PACKED_VQ,
 601                                        &get_integer_arg, &packed_vq) < 0) {
 602                         PMD_INIT_LOG(ERR, "error to parse %s",
 603                                      VIRTIO_USER_ARG_PACKED_VQ);
 604                         goto end;
 605                 }
 606         }
 607
 608         if (queues > 1 && cq == 0) {
 609                 PMD_INIT_LOG(ERR, "multi-q requires ctrl-q");
 610                 goto end;
 611         }
 612
 613         if (queues > VIRTIO_MAX_VIRTQUEUE_PAIRS) {
 614                 PMD_INIT_LOG(ERR, "arg %s %" PRIu64 " exceeds the limit %u",
 615                         VIRTIO_USER_ARG_QUEUES_NUM, queues,
 616                         VIRTIO_MAX_VIRTQUEUE_PAIRS);
 617                 goto end;
 618         }
 619
 620         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_MRG_RXBUF) == 1) {
 621                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_MRG_RXBUF,
 622                                        &get_integer_arg, &mrg_rxbuf) < 0) {
 623                         PMD_INIT_LOG(ERR, "error to parse %s",
 624                                      VIRTIO_USER_ARG_MRG_RXBUF);
 625                         goto end;
 626                 }
 627         }
 628
 629         if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_IN_ORDER) == 1) {
 630                 if (rte_kvargs_process(kvlist, VIRTIO_USER_ARG_IN_ORDER,
 631                                        &get_integer_arg, &in_order) < 0) {
 632                         PMD_INIT_LOG(ERR, "error to parse %s",
 633                                      VIRTIO_USER_ARG_IN_ORDER);
 634                         goto end;
 635                 }
 636         }
 637
 638         if (rte_eal_process_type() == RTE_PROC_PRIMARY) {
 639                 struct virtio_user_dev *vu_dev;
 640
 641                 eth_dev = virtio_user_eth_dev_alloc(dev);
 642                 if (!eth_dev) {
 643                         PMD_INIT_LOG(ERR, "virtio_user fails to alloc device");
 644                         goto end;
 645                 }
 646
 647                 hw = eth_dev->data->dev_private;
 648                 vu_dev = virtio_user_get_dev(hw);
 649                 if (server_mode == 1)
 650                         vu_dev->is_server = true;
 651                 else
 652                         vu_dev->is_server = false;
 653                 if (virtio_user_dev_init(hw->virtio_user_dev, path, queues, cq,
 654                                  queue_size, mac_addr, &ifname, mrg_rxbuf,
 655                                  in_order, packed_vq) < 0) {
 656                         PMD_INIT_LOG(ERR, "virtio_user_dev_init fails");
 657                         virtio_user_eth_dev_free(eth_dev);
 658                         goto end;
 659                 }
 660
 661         } else {
 662                 eth_dev = rte_eth_dev_attach_secondary(rte_vdev_device_name(dev));
 663                 if (!eth_dev)
 664                         goto end;
 665         }
 666
 667         /* previously called by rte_pci_probe() for physical dev */
 668         if (eth_virtio_dev_init(eth_dev) < 0) {
 669                 PMD_INIT_LOG(ERR, "eth_virtio_dev_init fails");
 670                 virtio_user_eth_dev_free(eth_dev);
 671                 goto end;
 672         }
 673
 674         rte_eth_dev_probing_finish(eth_dev);
 675         ret = 0;
 676
 677 end:
 678         if (kvlist)
 679                 rte_kvargs_free(kvlist);
 680         if (path)
 681                 free(path);
 682         if (mac_addr)
 683                 free(mac_addr);
 684         if (ifname)
 685                 free(ifname);
 686         return ret;
 687 }
 688
 689 static int
 690 virtio_user_pmd_remove(struct rte_vdev_device *vdev)
 691 {
 692         const char *name;
 693         struct rte_eth_dev *eth_dev;
 694         struct virtio_hw *hw;
 695         struct virtio_user_dev *dev;
 696
 697         if (!vdev)
 698                 return -EINVAL;
 699
 700         name = rte_vdev_device_name(vdev);
 701         PMD_DRV_LOG(INFO, "Un-Initializing %s", name);
 702         eth_dev = rte_eth_dev_allocated(name);
 703         if (!eth_dev)
 704                 return -ENODEV;
 705
 706         /* make sure the device is stopped, queues freed */
 707         rte_eth_dev_close(eth_dev->data->port_id);
 708
 709         hw = eth_dev->data->dev_private;
 710         dev = hw->virtio_user_dev;
 711         virtio_user_dev_uninit(dev);
 712
 713         rte_eth_dev_release_port(eth_dev);
 714
 715         return 0;
 716 }
 717
 718 static struct rte_vdev_driver virtio_user_driver = {
 719         .probe = virtio_user_pmd_probe,
 720         .remove = virtio_user_pmd_remove,
 721 };
 722
 723 RTE_PMD_REGISTER_VDEV(net_virtio_user, virtio_user_driver);
 724 RTE_PMD_REGISTER_ALIAS(net_virtio_user, virtio_user);
 725 RTE_PMD_REGISTER_PARAM_STRING(net_virtio_user,
 726         "path=<path> "
 727         "mac=<mac addr> "
 728         "cq=<int> "
 729         "queue_size=<int> "
 730         "queues=<int> "
 731         "iface=<string> "
 732         "server=<0|1> "
 733         "mrg_rxbuf=<0|1> "
 734         "in_order=<0|1> "
 735         "packed_vq=<0|1>");