lib/librte_pmd_virtio/virtio_ethdev.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
   5  *   All rights reserved.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  17  *     * Neither the name of Intel Corporation nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #include <stdint.h>
  35 #include <string.h>
  36 #include <stdio.h>
  37 #include <errno.h>
  38 #include <unistd.h>
  39 #ifdef RTE_EXEC_ENV_LINUXAPP
  40 #include <dirent.h>
  41 #endif
  42
  43 #include <rte_ethdev.h>
  44 #include <rte_memcpy.h>
  45 #include <rte_string_fns.h>
  46 #include <rte_memzone.h>
  47 #include <rte_malloc.h>
  48 #include <rte_atomic.h>
  49 #include <rte_branch_prediction.h>
  50 #include <rte_pci.h>
  51 #include <rte_ether.h>
  52 #include <rte_common.h>
  53
  54 #include <rte_memory.h>
  55 #include <rte_eal.h>
  56 #include <rte_dev.h>
  57
  58 #include "virtio_ethdev.h"
  59 #include "virtio_pci.h"
  60 #include "virtio_logs.h"
  61 #include "virtqueue.h"
  62
  63
  64 static int eth_virtio_dev_init(struct eth_driver *eth_drv,
  65                 struct rte_eth_dev *eth_dev);
  66 static int  virtio_dev_configure(struct rte_eth_dev *dev);
  67 static int  virtio_dev_start(struct rte_eth_dev *dev);
  68 static void virtio_dev_stop(struct rte_eth_dev *dev);
  69 static void virtio_dev_info_get(struct rte_eth_dev *dev,
  70                                 struct rte_eth_dev_info *dev_info);
  71 static int virtio_dev_link_update(struct rte_eth_dev *dev,
  72         __rte_unused int wait_to_complete);
  73
  74 static void virtio_set_hwaddr(struct virtio_hw *hw);
  75 static void virtio_get_hwaddr(struct virtio_hw *hw);
  76
  77 static void virtio_dev_rx_queue_release(__rte_unused void *rxq);
  78 static void virtio_dev_tx_queue_release(__rte_unused void *txq);
  79
  80 static void virtio_dev_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *stats);
  81 static void virtio_dev_stats_reset(struct rte_eth_dev *dev);
  82 static void virtio_dev_free_mbufs(struct rte_eth_dev *dev);
  83
  84 static int virtio_dev_queue_stats_mapping_set(
  85         __rte_unused struct rte_eth_dev *eth_dev,
  86         __rte_unused uint16_t queue_id,
  87         __rte_unused uint8_t stat_idx,
  88         __rte_unused uint8_t is_rx);
  89
  90 /*
  91  * The set of PCI devices this driver supports
  92  */
  93 static struct rte_pci_id pci_id_virtio_map[] = {
  94
  95 #define RTE_PCI_DEV_ID_DECL_VIRTIO(vend, dev) {RTE_PCI_DEVICE(vend, dev)},
  96 #include "rte_pci_dev_ids.h"
  97
  98 { .vendor_id = 0, /* sentinel */ },
  99 };
 100
 101 static int
 102 virtio_send_command(struct virtqueue *vq, struct virtio_pmd_ctrl *ctrl,
 103                 int *dlen, int pkt_num)
 104 {
 105         uint32_t head = vq->vq_desc_head_idx, i;
 106         int k, sum = 0;
 107         virtio_net_ctrl_ack status = ~0;
 108         struct virtio_pmd_ctrl result;
 109
 110         ctrl->status = status;
 111
 112         if (!vq->hw->cvq) {
 113                 PMD_INIT_LOG(ERR,
 114                              "%s(): Control queue is not supported.",
 115                              __func__);
 116                 return -1;
 117         }
 118
 119         PMD_INIT_LOG(DEBUG, "vq->vq_desc_head_idx = %d, status = %d, "
 120                 "vq->hw->cvq = %p vq = %p",
 121                 vq->vq_desc_head_idx, status, vq->hw->cvq, vq);
 122
 123         if ((vq->vq_free_cnt < ((uint32_t)pkt_num + 2)) || (pkt_num < 1))
 124                 return -1;
 125
 126         memcpy(vq->virtio_net_hdr_mz->addr, ctrl,
 127                 sizeof(struct virtio_pmd_ctrl));
 128
 129         /*
 130          * Format is enforced in qemu code:
 131          * One TX packet for header;
 132          * At least one TX packet per argument;
 133          * One RX packet for ACK.
 134          */
 135         vq->vq_ring.desc[head].flags = VRING_DESC_F_NEXT;
 136         vq->vq_ring.desc[head].addr = vq->virtio_net_hdr_mz->phys_addr;
 137         vq->vq_ring.desc[head].len = sizeof(struct virtio_net_ctrl_hdr);
 138         vq->vq_free_cnt--;
 139         i = vq->vq_ring.desc[head].next;
 140
 141         for (k = 0; k < pkt_num; k++) {
 142                 vq->vq_ring.desc[i].flags = VRING_DESC_F_NEXT;
 143                 vq->vq_ring.desc[i].addr = vq->virtio_net_hdr_mz->phys_addr
 144                         + sizeof(struct virtio_net_ctrl_hdr)
 145                         + sizeof(ctrl->status) + sizeof(uint8_t)*sum;
 146                 vq->vq_ring.desc[i].len = dlen[k];
 147                 sum += dlen[k];
 148                 vq->vq_free_cnt--;
 149                 i = vq->vq_ring.desc[i].next;
 150         }
 151
 152         vq->vq_ring.desc[i].flags = VRING_DESC_F_WRITE;
 153         vq->vq_ring.desc[i].addr = vq->virtio_net_hdr_mz->phys_addr
 154                         + sizeof(struct virtio_net_ctrl_hdr);
 155         vq->vq_ring.desc[i].len = sizeof(ctrl->status);
 156         vq->vq_free_cnt--;
 157
 158         vq->vq_desc_head_idx = vq->vq_ring.desc[i].next;
 159
 160         vq_update_avail_ring(vq, head);
 161         vq_update_avail_idx(vq);
 162
 163         PMD_INIT_LOG(DEBUG, "vq->vq_queue_index = %d", vq->vq_queue_index);
 164
 165         virtqueue_notify(vq);
 166
 167         while (vq->vq_used_cons_idx == vq->vq_ring.used->idx)
 168                 usleep(100);
 169
 170         while (vq->vq_used_cons_idx != vq->vq_ring.used->idx) {
 171                 uint32_t idx, desc_idx, used_idx;
 172                 struct vring_used_elem *uep;
 173
 174                 rmb();
 175
 176                 used_idx = (uint32_t)(vq->vq_used_cons_idx
 177                                 & (vq->vq_nentries - 1));
 178                 uep = &vq->vq_ring.used->ring[used_idx];
 179                 idx = (uint32_t) uep->id;
 180                 desc_idx = idx;
 181
 182                 while (vq->vq_ring.desc[desc_idx].flags & VRING_DESC_F_NEXT) {
 183                         desc_idx = vq->vq_ring.desc[desc_idx].next;
 184                         vq->vq_free_cnt++;
 185                 }
 186
 187                 vq->vq_ring.desc[desc_idx].next = vq->vq_desc_head_idx;
 188                 vq->vq_desc_head_idx = idx;
 189
 190                 vq->vq_used_cons_idx++;
 191                 vq->vq_free_cnt++;
 192         }
 193
 194         PMD_INIT_LOG(DEBUG, "vq->vq_free_cnt=%d\nvq->vq_desc_head_idx=%d",
 195                         vq->vq_free_cnt, vq->vq_desc_head_idx);
 196
 197         memcpy(&result, vq->virtio_net_hdr_mz->addr,
 198                         sizeof(struct virtio_pmd_ctrl));
 199
 200         return result.status;
 201 }
 202
 203 static int
 204 virtio_set_multiple_queues(struct rte_eth_dev *dev, uint16_t nb_queues)
 205 {
 206         struct virtio_hw *hw
 207                 = VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
 208         struct virtio_pmd_ctrl ctrl;
 209         int dlen[1];
 210         int ret;
 211
 212         ctrl.hdr.class = VIRTIO_NET_CTRL_MQ;
 213         ctrl.hdr.cmd = VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET;
 214         memcpy(ctrl.data, &nb_queues, sizeof(uint16_t));
 215
 216         dlen[0] = sizeof(uint16_t);
 217
 218         ret = virtio_send_command(hw->cvq, &ctrl, dlen, 1);
 219
 220         if (ret) {
 221                 PMD_INIT_LOG(ERR, "Multiqueue configured but send command "
 222                           "failed, this is too late now...");
 223                 return -EINVAL;
 224         }
 225
 226         return 0;
 227 }
 228
 229 int virtio_dev_queue_setup(struct rte_eth_dev *dev,
 230                         int queue_type,
 231                         uint16_t queue_idx,
 232                         uint8_t  vtpci_queue_idx,
 233                         uint16_t nb_desc,
 234                         unsigned int socket_id,
 235                         struct virtqueue **pvq)
 236 {
 237         char vq_name[VIRTQUEUE_MAX_NAME_SZ];
 238         const struct rte_memzone *mz;
 239         uint16_t vq_size;
 240         int size;
 241         struct virtio_hw *hw =
 242                 VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
 243         struct virtqueue  *vq = NULL;
 244
 245         /* Write the virtqueue index to the Queue Select Field */
 246         VIRTIO_WRITE_REG_2(hw, VIRTIO_PCI_QUEUE_SEL, vtpci_queue_idx);
 247         PMD_INIT_LOG(DEBUG, "selecting queue: %d", vtpci_queue_idx);
 248
 249         /*
 250          * Read the virtqueue size from the Queue Size field
 251          * Always power of 2 and if 0 virtqueue does not exist
 252          */
 253         vq_size = VIRTIO_READ_REG_2(hw, VIRTIO_PCI_QUEUE_NUM);
 254         PMD_INIT_LOG(DEBUG, "vq_size: %d nb_desc:%d", vq_size, nb_desc);
 255         if (nb_desc == 0)
 256                 nb_desc = vq_size;
 257         if (vq_size == 0) {
 258                 PMD_INIT_LOG(ERR, "%s: virtqueue does not exist", __func__);
 259                 return -EINVAL;
 260         } else if (!rte_is_power_of_2(vq_size)) {
 261                 PMD_INIT_LOG(ERR, "%s: virtqueue size is not powerof 2", __func__);
 262                 return -EINVAL;
 263         } else if (nb_desc != vq_size) {
 264                 PMD_INIT_LOG(ERR, "Warning: nb_desc(%d) is not equal to vq size (%d), fall to vq size",
 265                         nb_desc, vq_size);
 266                 nb_desc = vq_size;
 267         }
 268
 269         if (queue_type == VTNET_RQ) {
 270                 snprintf(vq_name, sizeof(vq_name), "port%d_rvq%d",
 271                         dev->data->port_id, queue_idx);
 272                 vq = rte_zmalloc(vq_name, sizeof(struct virtqueue) +
 273                         vq_size * sizeof(struct vq_desc_extra), CACHE_LINE_SIZE);
 274         } else if (queue_type == VTNET_TQ) {
 275                 snprintf(vq_name, sizeof(vq_name), "port%d_tvq%d",
 276                         dev->data->port_id, queue_idx);
 277                 vq = rte_zmalloc(vq_name, sizeof(struct virtqueue) +
 278                         vq_size * sizeof(struct vq_desc_extra), CACHE_LINE_SIZE);
 279         } else if (queue_type == VTNET_CQ) {
 280                 snprintf(vq_name, sizeof(vq_name), "port%d_cvq",
 281                         dev->data->port_id);
 282                 vq = rte_zmalloc(vq_name, sizeof(struct virtqueue) +
 283                         vq_size * sizeof(struct vq_desc_extra),
 284                         CACHE_LINE_SIZE);
 285         }
 286         if (vq == NULL) {
 287                 PMD_INIT_LOG(ERR, "%s: Can not allocate virtqueue", __func__);
 288                 return (-ENOMEM);
 289         }
 290
 291         vq->hw = hw;
 292         vq->port_id = dev->data->port_id;
 293         vq->queue_id = queue_idx;
 294         vq->vq_queue_index = vtpci_queue_idx;
 295         vq->vq_alignment = VIRTIO_PCI_VRING_ALIGN;
 296         vq->vq_nentries = vq_size;
 297         vq->vq_free_cnt = vq_size;
 298
 299         /*
 300          * Reserve a memzone for vring elements
 301          */
 302         size = vring_size(vq_size, VIRTIO_PCI_VRING_ALIGN);
 303         vq->vq_ring_size = RTE_ALIGN_CEIL(size, VIRTIO_PCI_VRING_ALIGN);
 304         PMD_INIT_LOG(DEBUG, "vring_size: %d, rounded_vring_size: %d", size, vq->vq_ring_size);
 305
 306         mz = rte_memzone_reserve_aligned(vq_name, vq->vq_ring_size,
 307                 socket_id, 0, VIRTIO_PCI_VRING_ALIGN);
 308         if (mz == NULL) {
 309                 rte_free(vq);
 310                 return -ENOMEM;
 311         }
 312
 313         /*
 314          * Virtio PCI device VIRTIO_PCI_QUEUE_PF register is 32bit,
 315          * and only accepts 32 bit page frame number.
 316          * Check if the allocated physical memory exceeds 16TB.
 317          */
 318         if ((mz->phys_addr + vq->vq_ring_size - 1) >> (VIRTIO_PCI_QUEUE_ADDR_SHIFT + 32)) {
 319                 PMD_INIT_LOG(ERR, "vring address shouldn't be above 16TB!");
 320                 rte_free(vq);
 321                 return -ENOMEM;
 322         }
 323
 324         memset(mz->addr, 0, sizeof(mz->len));
 325         vq->mz = mz;
 326         vq->vq_ring_mem = mz->phys_addr;
 327         vq->vq_ring_virt_mem = mz->addr;
 328         PMD_INIT_LOG(DEBUG, "vq->vq_ring_mem:      0x%"PRIx64, (uint64_t)mz->phys_addr);
 329         PMD_INIT_LOG(DEBUG, "vq->vq_ring_virt_mem: 0x%"PRIx64, (uint64_t)mz->addr);
 330         vq->virtio_net_hdr_mz  = NULL;
 331         vq->virtio_net_hdr_mem = 0;
 332
 333         if (queue_type == VTNET_TQ) {
 334                 /*
 335                  * For each xmit packet, allocate a virtio_net_hdr
 336                  */
 337                 snprintf(vq_name, sizeof(vq_name), "port%d_tvq%d_hdrzone",
 338                         dev->data->port_id, queue_idx);
 339                 vq->virtio_net_hdr_mz = rte_memzone_reserve_aligned(vq_name,
 340                         vq_size * sizeof(struct virtio_net_hdr),
 341                         socket_id, 0, CACHE_LINE_SIZE);
 342                 if (vq->virtio_net_hdr_mz == NULL) {
 343                         rte_free(vq);
 344                         return -ENOMEM;
 345                 }
 346                 vq->virtio_net_hdr_mem =
 347                         vq->virtio_net_hdr_mz->phys_addr;
 348                 memset(vq->virtio_net_hdr_mz->addr, 0,
 349                         vq_size * sizeof(struct virtio_net_hdr));
 350         } else if (queue_type == VTNET_CQ) {
 351                 /* Allocate a page for control vq command, data and status */
 352                 snprintf(vq_name, sizeof(vq_name), "port%d_cvq_hdrzone",
 353                         dev->data->port_id);
 354                 vq->virtio_net_hdr_mz = rte_memzone_reserve_aligned(vq_name,
 355                         PAGE_SIZE, socket_id, 0, CACHE_LINE_SIZE);
 356                 if (vq->virtio_net_hdr_mz == NULL) {
 357                         rte_free(vq);
 358                         return -ENOMEM;
 359                 }
 360                 vq->virtio_net_hdr_mem =
 361                         vq->virtio_net_hdr_mz->phys_addr;
 362                 memset(vq->virtio_net_hdr_mz->addr, 0, PAGE_SIZE);
 363         }
 364
 365         /*
 366          * Set guest physical address of the virtqueue
 367          * in VIRTIO_PCI_QUEUE_PFN config register of device
 368          */
 369         VIRTIO_WRITE_REG_4(hw, VIRTIO_PCI_QUEUE_PFN,
 370                         mz->phys_addr >> VIRTIO_PCI_QUEUE_ADDR_SHIFT);
 371         *pvq = vq;
 372         return 0;
 373 }
 374
 375 static int
 376 virtio_dev_cq_queue_setup(struct rte_eth_dev *dev, uint16_t vtpci_queue_idx,
 377                 uint32_t socket_id)
 378 {
 379         struct virtqueue *vq;
 380         uint16_t nb_desc = 0;
 381         int ret;
 382         struct virtio_hw *hw =
 383                 VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
 384
 385         PMD_INIT_FUNC_TRACE();
 386         ret = virtio_dev_queue_setup(dev, VTNET_CQ, VTNET_SQ_CQ_QUEUE_IDX,
 387                         vtpci_queue_idx, nb_desc, socket_id, &vq);
 388
 389         if (ret < 0) {
 390                 PMD_INIT_LOG(ERR, "control vq initialization failed");
 391                 return ret;
 392         }
 393
 394         hw->cvq = vq;
 395         return 0;
 396 }
 397
 398 static void
 399 virtio_dev_close(struct rte_eth_dev *dev)
 400 {
 401         PMD_INIT_LOG(DEBUG, "virtio_dev_close");
 402
 403         virtio_dev_stop(dev);
 404 }
 405
 406 /*
 407  * dev_ops for virtio, bare necessities for basic operation
 408  */
 409 static struct eth_dev_ops virtio_eth_dev_ops = {
 410         .dev_configure           = virtio_dev_configure,
 411         .dev_start               = virtio_dev_start,
 412         .dev_stop                = virtio_dev_stop,
 413         .dev_close               = virtio_dev_close,
 414
 415         .dev_infos_get           = virtio_dev_info_get,
 416         .stats_get               = virtio_dev_stats_get,
 417         .stats_reset             = virtio_dev_stats_reset,
 418         .link_update             = virtio_dev_link_update,
 419         .mac_addr_add            = NULL,
 420         .mac_addr_remove         = NULL,
 421         .rx_queue_setup          = virtio_dev_rx_queue_setup,
 422         /* meaningfull only to multiple queue */
 423         .rx_queue_release        = virtio_dev_rx_queue_release,
 424         .tx_queue_setup          = virtio_dev_tx_queue_setup,
 425         /* meaningfull only to multiple queue */
 426         .tx_queue_release        = virtio_dev_tx_queue_release,
 427         /* collect stats per queue */
 428         .queue_stats_mapping_set = virtio_dev_queue_stats_mapping_set,
 429 };
 430
 431 static inline int
 432 virtio_dev_atomic_read_link_status(struct rte_eth_dev *dev,
 433                                 struct rte_eth_link *link)
 434 {
 435         struct rte_eth_link *dst = link;
 436         struct rte_eth_link *src = &(dev->data->dev_link);
 437
 438         if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
 439                         *(uint64_t *)src) == 0)
 440                 return -1;
 441
 442         return 0;
 443 }
 444
 445 /**
 446  * Atomically writes the link status information into global
 447  * structure rte_eth_dev.
 448  *
 449  * @param dev
 450  *   - Pointer to the structure rte_eth_dev to read from.
 451  *   - Pointer to the buffer to be saved with the link status.
 452  *
 453  * @return
 454  *   - On success, zero.
 455  *   - On failure, negative value.
 456  */
 457 static inline int
 458 virtio_dev_atomic_write_link_status(struct rte_eth_dev *dev,
 459                 struct rte_eth_link *link)
 460 {
 461         struct rte_eth_link *dst = &(dev->data->dev_link);
 462         struct rte_eth_link *src = link;
 463
 464         if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
 465                                         *(uint64_t *)src) == 0)
 466                 return -1;
 467
 468         return 0;
 469 }
 470
 471 static void
 472 virtio_dev_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *stats)
 473 {
 474         unsigned i;
 475
 476         for (i = 0; i < dev->data->nb_tx_queues; i++) {
 477                 const struct virtqueue *txvq = dev->data->tx_queues[i];
 478                 if (txvq == NULL)
 479                         continue;
 480
 481                 stats->opackets += txvq->packets;
 482                 stats->obytes += txvq->bytes;
 483                 stats->oerrors += txvq->errors;
 484
 485                 if (i < RTE_ETHDEV_QUEUE_STAT_CNTRS) {
 486                         stats->q_opackets[i] = txvq->packets;
 487                         stats->q_obytes[i] = txvq->bytes;
 488                 }
 489         }
 490
 491         for (i = 0; i < dev->data->nb_rx_queues; i++) {
 492                 const struct virtqueue *rxvq = dev->data->rx_queues[i];
 493                 if (rxvq == NULL)
 494                         continue;
 495
 496                 stats->ipackets += rxvq->packets;
 497                 stats->ibytes += rxvq->bytes;
 498                 stats->ierrors += rxvq->errors;
 499
 500                 if (i < RTE_ETHDEV_QUEUE_STAT_CNTRS) {
 501                         stats->q_ipackets[i] = rxvq->packets;
 502                         stats->q_ibytes[i] = rxvq->bytes;
 503                 }
 504         }
 505
 506         stats->rx_nombuf = dev->data->rx_mbuf_alloc_failed;
 507 }
 508
 509 static void
 510 virtio_dev_stats_reset(struct rte_eth_dev *dev)
 511 {
 512         unsigned int i;
 513
 514         for (i = 0; i < dev->data->nb_tx_queues; i++) {
 515                 struct virtqueue *txvq = dev->data->tx_queues[i];
 516                 if (txvq == NULL)
 517                         continue;
 518
 519                 txvq->packets = 0;
 520                 txvq->bytes = 0;
 521                 txvq->errors = 0;
 522         }
 523
 524         for (i = 0; i < dev->data->nb_rx_queues; i++) {
 525                 struct virtqueue *rxvq = dev->data->rx_queues[i];
 526                 if (rxvq == NULL)
 527                         continue;
 528
 529                 rxvq->packets = 0;
 530                 rxvq->bytes = 0;
 531                 rxvq->errors = 0;
 532         }
 533
 534         dev->data->rx_mbuf_alloc_failed = 0;
 535 }
 536
 537 static void
 538 virtio_set_hwaddr(struct virtio_hw *hw)
 539 {
 540         vtpci_write_dev_config(hw,
 541                         offsetof(struct virtio_net_config, mac),
 542                         &hw->mac_addr, ETHER_ADDR_LEN);
 543 }
 544
 545 static void
 546 virtio_get_hwaddr(struct virtio_hw *hw)
 547 {
 548         if (vtpci_with_feature(hw, VIRTIO_NET_F_MAC)) {
 549                 vtpci_read_dev_config(hw,
 550                         offsetof(struct virtio_net_config, mac),
 551                         &hw->mac_addr, ETHER_ADDR_LEN);
 552         } else {
 553                 eth_random_addr(&hw->mac_addr[0]);
 554                 virtio_set_hwaddr(hw);
 555         }
 556 }
 557
 558
 559 static void
 560 virtio_negotiate_features(struct virtio_hw *hw)
 561 {
 562         uint32_t host_features, mask;
 563
 564         mask = VIRTIO_NET_F_CTRL_RX | VIRTIO_NET_F_CTRL_VLAN;
 565         mask |= VIRTIO_NET_F_CSUM | VIRTIO_NET_F_GUEST_CSUM;
 566
 567         /* TSO and LRO are only available when their corresponding
 568          * checksum offload feature is also negotiated.
 569          */
 570         mask |= VIRTIO_NET_F_HOST_TSO4 | VIRTIO_NET_F_HOST_TSO6 | VIRTIO_NET_F_HOST_ECN;
 571         mask |= VIRTIO_NET_F_GUEST_TSO4 | VIRTIO_NET_F_GUEST_TSO6 | VIRTIO_NET_F_GUEST_ECN;
 572         mask |= VTNET_LRO_FEATURES;
 573
 574         /* rx_mbuf should not be in multiple merged segments */
 575         mask |= VIRTIO_NET_F_MRG_RXBUF;
 576
 577         /* not negotiating INDIRECT descriptor table support */
 578         mask |= VIRTIO_RING_F_INDIRECT_DESC;
 579
 580         /* Prepare guest_features: feature that driver wants to support */
 581         hw->guest_features = VTNET_FEATURES & ~mask;
 582         PMD_INIT_LOG(DEBUG, "guest_features before negotiate = %x",
 583                 guest_features);
 584
 585         /* Read device(host) feature bits */
 586         host_features = VIRTIO_READ_REG_4(hw, VIRTIO_PCI_HOST_FEATURES);
 587         PMD_INIT_LOG(DEBUG, "host_features before negotiate = %x",
 588                 host_features);
 589
 590         /*
 591          * Negotiate features: Subset of device feature bits are written back
 592          * guest feature bits.
 593          */
 594         hw->guest_features = vtpci_negotiate_features(hw, host_features);
 595         PMD_INIT_LOG(DEBUG, "features after negotiate = %x",
 596                 hw->guest_features);
 597 }
 598
 599 #ifdef RTE_EXEC_ENV_LINUXAPP
 600 static int
 601 parse_sysfs_value(const char *filename, unsigned long *val)
 602 {
 603         FILE *f;
 604         char buf[BUFSIZ];
 605         char *end = NULL;
 606
 607         f = fopen(filename, "r");
 608         if (f == NULL) {
 609                 PMD_INIT_LOG(ERR, "%s(): cannot open sysfs value %s",
 610                              __func__, filename);
 611                 return -1;
 612         }
 613
 614         if (fgets(buf, sizeof(buf), f) == NULL) {
 615                 PMD_INIT_LOG(ERR, "%s(): cannot read sysfs value %s",
 616                              __func__, filename);
 617                 fclose(f);
 618                 return -1;
 619         }
 620         *val = strtoul(buf, &end, 0);
 621         if ((buf[0] == '\0') || (end == NULL) || (*end != '\n')) {
 622                 PMD_INIT_LOG(ERR, "%s(): cannot parse sysfs value %s",
 623                              __func__, filename);
 624                 fclose(f);
 625                 return -1;
 626         }
 627         fclose(f);
 628         return 0;
 629 }
 630
 631 static int get_uio_dev(struct rte_pci_addr *loc, char *buf, unsigned int buflen)
 632 {
 633         unsigned int uio_num;
 634         struct dirent *e;
 635         DIR *dir;
 636         char dirname[PATH_MAX];
 637
 638         /* depending on kernel version, uio can be located in uio/uioX
 639          * or uio:uioX */
 640         snprintf(dirname, sizeof(dirname),
 641                      SYSFS_PCI_DEVICES "/" PCI_PRI_FMT "/uio",
 642                      loc->domain, loc->bus, loc->devid, loc->function);
 643         dir = opendir(dirname);
 644         if (dir == NULL) {
 645                 /* retry with the parent directory */
 646                 snprintf(dirname, sizeof(dirname),
 647                              SYSFS_PCI_DEVICES "/" PCI_PRI_FMT,
 648                              loc->domain, loc->bus, loc->devid, loc->function);
 649                 dir = opendir(dirname);
 650
 651                 if (dir == NULL) {
 652                         PMD_INIT_LOG(ERR, "Cannot opendir %s", dirname);
 653                         return -1;
 654                 }
 655         }
 656
 657         /* take the first file starting with "uio" */
 658         while ((e = readdir(dir)) != NULL) {
 659                 /* format could be uio%d ...*/
 660                 int shortprefix_len = sizeof("uio") - 1;
 661                 /* ... or uio:uio%d */
 662                 int longprefix_len = sizeof("uio:uio") - 1;
 663                 char *endptr;
 664
 665                 if (strncmp(e->d_name, "uio", 3) != 0)
 666                         continue;
 667
 668                 /* first try uio%d */
 669                 errno = 0;
 670                 uio_num = strtoull(e->d_name + shortprefix_len, &endptr, 10);
 671                 if (errno == 0 && endptr != (e->d_name + shortprefix_len)) {
 672                         snprintf(buf, buflen, "%s/uio%u", dirname, uio_num);
 673                         break;
 674                 }
 675
 676                 /* then try uio:uio%d */
 677                 errno = 0;
 678                 uio_num = strtoull(e->d_name + longprefix_len, &endptr, 10);
 679                 if (errno == 0 && endptr != (e->d_name + longprefix_len)) {
 680                         snprintf(buf, buflen, "%s/uio:uio%u", dirname,
 681                                      uio_num);
 682                         break;
 683                 }
 684         }
 685         closedir(dir);
 686
 687         /* No uio resource found */
 688         if (e == NULL) {
 689                 PMD_INIT_LOG(ERR, "Could not find uio resource");
 690                 return -1;
 691         }
 692
 693         return 0;
 694 }
 695
 696 static int
 697 virtio_has_msix(const struct rte_pci_addr *loc)
 698 {
 699         DIR *d;
 700         char dirname[PATH_MAX];
 701
 702         snprintf(dirname, sizeof(dirname),
 703                      SYSFS_PCI_DEVICES "/" PCI_PRI_FMT "/msi_irqs",
 704                      loc->domain, loc->bus, loc->devid, loc->function);
 705
 706         d = opendir(dirname);
 707         if (d)
 708                 closedir(d);
 709
 710         return (d != NULL);
 711 }
 712 #else
 713 static int
 714 virtio_has_msix(const struct rte_pci_addr *loc __rte_unused)
 715 {
 716         /* nic_uio does not enable interrupts, return 0 (false). */
 717         return 0;
 718 }
 719 #endif
 720
 721 /*
 722  * This function is based on probe() function in virtio_pci.c
 723  * It returns 0 on success.
 724  */
 725 static int
 726 eth_virtio_dev_init(__rte_unused struct eth_driver *eth_drv,
 727                 struct rte_eth_dev *eth_dev)
 728 {
 729         struct virtio_net_config *config;
 730         struct virtio_net_config local_config;
 731         uint32_t offset_conf = sizeof(config->mac);
 732         struct rte_pci_device *pci_dev;
 733         struct virtio_hw *hw =
 734                 VIRTIO_DEV_PRIVATE_TO_HW(eth_dev->data->dev_private);
 735
 736         if (RTE_PKTMBUF_HEADROOM < sizeof(struct virtio_net_hdr)) {
 737                 PMD_INIT_LOG(ERR,
 738                         "MBUF HEADROOM should be enough to hold virtio net hdr\n");
 739                 return -1;
 740         }
 741
 742         if (!(rte_eal_get_configuration()->flags & EAL_FLG_HIGH_IOPL)) {
 743                 PMD_INIT_LOG(ERR,
 744                         "IOPL call failed in EAL init - cannot use virtio PMD driver\n");
 745                 return -1;
 746         }
 747
 748         eth_dev->dev_ops = &virtio_eth_dev_ops;
 749         eth_dev->rx_pkt_burst = &virtio_recv_pkts;
 750         eth_dev->tx_pkt_burst = &virtio_xmit_pkts;
 751
 752         if (rte_eal_process_type() == RTE_PROC_SECONDARY)
 753                 return 0;
 754
 755         pci_dev = eth_dev->pci_dev;
 756
 757 #ifdef RTE_EXEC_ENV_LINUXAPP
 758         {
 759                 char dirname[PATH_MAX];
 760                 char filename[PATH_MAX];
 761                 unsigned long start, size;
 762
 763                 if (get_uio_dev(&pci_dev->addr, dirname, sizeof(dirname)) < 0)
 764                         return -1;
 765
 766                 /* get portio size */
 767                 snprintf(filename, sizeof(filename),
 768                              "%s/portio/port0/size", dirname);
 769                 if (parse_sysfs_value(filename, &size) < 0) {
 770                         PMD_INIT_LOG(ERR, "%s(): cannot parse size",
 771                                      __func__);
 772                         return -1;
 773                 }
 774
 775                 /* get portio start */
 776                 snprintf(filename, sizeof(filename),
 777                              "%s/portio/port0/start", dirname);
 778                 if (parse_sysfs_value(filename, &start) < 0) {
 779                         PMD_INIT_LOG(ERR, "%s(): cannot parse portio start",
 780                                      __func__);
 781                         return -1;
 782                 }
 783                 pci_dev->mem_resource[0].addr = (void *)(uintptr_t)start;
 784                 pci_dev->mem_resource[0].len =  (uint64_t)size;
 785                 PMD_INIT_LOG(DEBUG,
 786                              "PCI Port IO found start=0x%lx with size=0x%lx",
 787                              start, size);
 788         }
 789 #endif
 790         hw->use_msix = virtio_has_msix(&pci_dev->addr);
 791         hw->io_base = (uint32_t)(uintptr_t)pci_dev->mem_resource[0].addr;
 792
 793         /* Reset the device although not necessary at startup */
 794         vtpci_reset(hw);
 795
 796         /* Tell the host we've noticed this device. */
 797         vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_ACK);
 798
 799         /* Tell the host we've known how to drive the device. */
 800         vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_DRIVER);
 801         virtio_negotiate_features(hw);
 802
 803         /* Setting up rx_header size for the device */
 804         if (vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF))
 805                 hw->vtnet_hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf);
 806         else
 807                 hw->vtnet_hdr_size = sizeof(struct virtio_net_hdr);
 808
 809         /* Allocate memory for storing MAC addresses */
 810         eth_dev->data->mac_addrs = rte_zmalloc("virtio", ETHER_ADDR_LEN, 0);
 811         if (eth_dev->data->mac_addrs == NULL) {
 812                 PMD_INIT_LOG(ERR,
 813                         "Failed to allocate %d bytes needed to store MAC addresses",
 814                         ETHER_ADDR_LEN);
 815                 return -ENOMEM;
 816         }
 817
 818         /* Copy the permanent MAC address to: virtio_hw */
 819         virtio_get_hwaddr(hw);
 820         ether_addr_copy((struct ether_addr *) hw->mac_addr,
 821                         &eth_dev->data->mac_addrs[0]);
 822         PMD_INIT_LOG(DEBUG,
 823                      "PORT MAC: %02X:%02X:%02X:%02X:%02X:%02X",
 824                      hw->mac_addr[0], hw->mac_addr[1], hw->mac_addr[2],
 825                      hw->mac_addr[3], hw->mac_addr[4], hw->mac_addr[5]);
 826
 827         if (vtpci_with_feature(hw, VIRTIO_NET_F_CTRL_VQ)) {
 828                 config = &local_config;
 829
 830                 if (vtpci_with_feature(hw, VIRTIO_NET_F_STATUS)) {
 831                         offset_conf += sizeof(config->status);
 832                 } else {
 833                         PMD_INIT_LOG(DEBUG,
 834                                      "VIRTIO_NET_F_STATUS is not supported");
 835                         config->status = 0;
 836                 }
 837
 838                 if (vtpci_with_feature(hw, VIRTIO_NET_F_MQ)) {
 839                         offset_conf += sizeof(config->max_virtqueue_pairs);
 840                 } else {
 841                         PMD_INIT_LOG(DEBUG,
 842                                      "VIRTIO_NET_F_MQ is not supported");
 843                         config->max_virtqueue_pairs = 1;
 844                 }
 845
 846                 vtpci_read_dev_config(hw, 0, (uint8_t *)config, offset_conf);
 847
 848                 hw->max_rx_queues =
 849                         (VIRTIO_MAX_RX_QUEUES < config->max_virtqueue_pairs) ?
 850                         VIRTIO_MAX_RX_QUEUES : config->max_virtqueue_pairs;
 851                 hw->max_tx_queues =
 852                         (VIRTIO_MAX_TX_QUEUES < config->max_virtqueue_pairs) ?
 853                         VIRTIO_MAX_TX_QUEUES : config->max_virtqueue_pairs;
 854
 855                 virtio_dev_cq_queue_setup(eth_dev,
 856                                         config->max_virtqueue_pairs * 2,
 857                                         SOCKET_ID_ANY);
 858
 859                 PMD_INIT_LOG(DEBUG, "config->max_virtqueue_pairs=%d",
 860                                 config->max_virtqueue_pairs);
 861                 PMD_INIT_LOG(DEBUG, "config->status=%d", config->status);
 862                 PMD_INIT_LOG(DEBUG,
 863                                 "PORT MAC: %02X:%02X:%02X:%02X:%02X:%02X",
 864                                 config->mac[0], config->mac[1],
 865                                 config->mac[2], config->mac[3],
 866                                 config->mac[4], config->mac[5]);
 867         } else {
 868                 hw->max_rx_queues = 1;
 869                 hw->max_tx_queues = 1;
 870         }
 871
 872         eth_dev->data->nb_rx_queues = hw->max_rx_queues;
 873         eth_dev->data->nb_tx_queues = hw->max_tx_queues;
 874
 875         PMD_INIT_LOG(DEBUG, "hw->max_rx_queues=%d   hw->max_tx_queues=%d",
 876                         hw->max_rx_queues, hw->max_tx_queues);
 877         PMD_INIT_LOG(DEBUG, "port %d vendorID=0x%x deviceID=0x%x",
 878                         eth_dev->data->port_id, pci_dev->id.vendor_id,
 879                         pci_dev->id.device_id);
 880         return 0;
 881 }
 882
 883 static struct eth_driver rte_virtio_pmd = {
 884         {
 885                 .name = "rte_virtio_pmd",
 886                 .id_table = pci_id_virtio_map,
 887                 .drv_flags = RTE_PCI_DRV_NEED_MAPPING,
 888         },
 889         .eth_dev_init = eth_virtio_dev_init,
 890         .dev_private_size = sizeof(struct virtio_adapter),
 891 };
 892
 893 /*
 894  * Driver initialization routine.
 895  * Invoked once at EAL init time.
 896  * Register itself as the [Poll Mode] Driver of PCI virtio devices.
 897  * Returns 0 on success.
 898  */
 899 static int
 900 rte_virtio_pmd_init(const char *name __rte_unused, const char *param __rte_unused)
 901 {
 902         rte_eth_driver_register(&rte_virtio_pmd);
 903         return 0;
 904 }
 905
 906 /*
 907  * Only 1 queue is supported, no queue release related operation
 908  */
 909 static void
 910 virtio_dev_rx_queue_release(__rte_unused void *rxq)
 911 {
 912 }
 913
 914 static void
 915 virtio_dev_tx_queue_release(__rte_unused void *txq)
 916 {
 917 }
 918
 919 /*
 920  * Configure virtio device
 921  * It returns 0 on success.
 922  */
 923 static int
 924 virtio_dev_configure(struct rte_eth_dev *dev)
 925 {
 926         const struct rte_eth_rxmode *rxmode = &dev->data->dev_conf.rxmode;
 927
 928         PMD_INIT_LOG(DEBUG, "configure");
 929
 930         if (rxmode->hw_ip_checksum) {
 931                 PMD_DRV_LOG(ERR, "HW IP checksum not supported");
 932                 return (-EINVAL);
 933         }
 934
 935         return 0;
 936 }
 937
 938
 939 static int
 940 virtio_dev_start(struct rte_eth_dev *dev)
 941 {
 942         uint16_t nb_queues, i;
 943         uint16_t status;
 944         struct virtio_hw *hw =
 945                 VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
 946
 947         /* Tell the host we've noticed this device. */
 948         vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_ACK);
 949
 950         /* Tell the host we've known how to drive the device. */
 951         vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_DRIVER);
 952
 953         virtio_dev_cq_start(dev);
 954
 955         /* Do final configuration before rx/tx engine starts */
 956         virtio_dev_rxtx_start(dev);
 957
 958         /* Check VIRTIO_NET_F_STATUS for link status*/
 959         if (vtpci_with_feature(hw, VIRTIO_NET_F_STATUS)) {
 960                 vtpci_read_dev_config(hw,
 961                                 offsetof(struct virtio_net_config, status),
 962                                 &status, sizeof(status));
 963                 if ((status & VIRTIO_NET_S_LINK_UP) == 0) {
 964                         PMD_INIT_LOG(ERR, "Port: %d Link is DOWN",
 965                                      dev->data->port_id);
 966                         return -EIO;
 967                 } else {
 968                         PMD_INIT_LOG(DEBUG, "Port: %d Link is UP",
 969                                      dev->data->port_id);
 970                 }
 971         }
 972         vtpci_reinit_complete(hw);
 973
 974         /*Notify the backend
 975          *Otherwise the tap backend might already stop its queue due to fullness.
 976          *vhost backend will have no chance to be waked up
 977          */
 978         nb_queues = dev->data->nb_rx_queues;
 979         if (nb_queues > 1) {
 980                 if (virtio_set_multiple_queues(dev, nb_queues) != 0)
 981                         return -EINVAL;
 982         }
 983
 984         PMD_INIT_LOG(DEBUG, "nb_queues=%d", nb_queues);
 985
 986         for (i = 0; i < nb_queues; i++)
 987                 virtqueue_notify(dev->data->rx_queues[i]);
 988
 989         PMD_INIT_LOG(DEBUG, "Notified backend at initialization");
 990
 991         for (i = 0; i < dev->data->nb_rx_queues; i++)
 992                 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->rx_queues[i]);
 993
 994         for (i = 0; i < dev->data->nb_tx_queues; i++)
 995                 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->tx_queues[i]);
 996
 997         return 0;
 998 }
 999
1000 static void virtio_dev_free_mbufs(struct rte_eth_dev *dev)
1001 {
1002         struct rte_mbuf *buf;
1003         int i, mbuf_num = 0;
1004
1005         for (i = 0; i < dev->data->nb_rx_queues; i++) {
1006                 PMD_INIT_LOG(DEBUG,
1007                              "Before freeing rxq[%d] used and unused buf", i);
1008                 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->rx_queues[i]);
1009
1010                 while ((buf = (struct rte_mbuf *)virtqueue_detatch_unused(
1011                                         dev->data->rx_queues[i])) != NULL) {
1012                         rte_pktmbuf_free_seg(buf);
1013                         mbuf_num++;
1014                 }
1015
1016                 PMD_INIT_LOG(DEBUG, "free %d mbufs", mbuf_num);
1017                 PMD_INIT_LOG(DEBUG,
1018                              "After freeing rxq[%d] used and unused buf", i);
1019                 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->rx_queues[i]);
1020         }
1021
1022         for (i = 0; i < dev->data->nb_tx_queues; i++) {
1023                 PMD_INIT_LOG(DEBUG,
1024                              "Before freeing txq[%d] used and unused bufs",
1025                              i);
1026                 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->tx_queues[i]);
1027
1028                 mbuf_num = 0;
1029                 while ((buf = (struct rte_mbuf *)virtqueue_detatch_unused(
1030                                         dev->data->tx_queues[i])) != NULL) {
1031                         rte_pktmbuf_free_seg(buf);
1032                         mbuf_num++;
1033                 }
1034
1035                 PMD_INIT_LOG(DEBUG, "free %d mbufs", mbuf_num);
1036                 PMD_INIT_LOG(DEBUG,
1037                              "After freeing txq[%d] used and unused buf", i);
1038                 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->tx_queues[i]);
1039         }
1040 }
1041
1042 /*
1043  * Stop device: disable rx and tx functions to allow for reconfiguring.
1044  */
1045 static void
1046 virtio_dev_stop(struct rte_eth_dev *dev)
1047 {
1048         struct virtio_hw *hw =
1049                 VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
1050
1051         /* reset the NIC */
1052         vtpci_reset(hw);
1053         virtio_dev_free_mbufs(dev);
1054 }
1055
1056 static int
1057 virtio_dev_link_update(struct rte_eth_dev *dev, __rte_unused int wait_to_complete)
1058 {
1059         struct rte_eth_link link, old;
1060         uint16_t status;
1061         struct virtio_hw *hw =
1062                 VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
1063         memset(&link, 0, sizeof(link));
1064         virtio_dev_atomic_read_link_status(dev, &link);
1065         old = link;
1066         link.link_duplex = FULL_DUPLEX;
1067         link.link_speed  = SPEED_10G;
1068         if (vtpci_with_feature(hw, VIRTIO_NET_F_STATUS)) {
1069                 PMD_INIT_LOG(DEBUG, "Get link status from hw");
1070                 vtpci_read_dev_config(hw,
1071                                 offsetof(struct virtio_net_config, status),
1072                                 &status, sizeof(status));
1073                 if ((status & VIRTIO_NET_S_LINK_UP) == 0) {
1074                         link.link_status = 0;
1075                         PMD_INIT_LOG(DEBUG, "Port %d is down",
1076                                      dev->data->port_id);
1077                 } else {
1078                         link.link_status = 1;
1079                         PMD_INIT_LOG(DEBUG, "Port %d is up",
1080                                      dev->data->port_id);
1081                 }
1082         } else {
1083                 link.link_status = 1;   /* Link up */
1084         }
1085         virtio_dev_atomic_write_link_status(dev, &link);
1086         if (old.link_status == link.link_status)
1087                 return -1;
1088         /*changed*/
1089         return 0;
1090 }
1091
1092 static void
1093 virtio_dev_info_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
1094 {
1095         struct virtio_hw *hw = VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
1096
1097         dev_info->driver_name = dev->driver->pci_drv.name;
1098         dev_info->max_rx_queues = (uint16_t)hw->max_rx_queues;
1099         dev_info->max_tx_queues = (uint16_t)hw->max_tx_queues;
1100         dev_info->min_rx_bufsize = VIRTIO_MIN_RX_BUFSIZE;
1101         dev_info->max_rx_pktlen = VIRTIO_MAX_RX_PKTLEN;
1102         dev_info->max_mac_addrs = VIRTIO_MAX_MAC_ADDRS;
1103 }
1104
1105 /*
1106  * It enables testpmd to collect per queue stats.
1107  */
1108 static int
1109 virtio_dev_queue_stats_mapping_set(__rte_unused struct rte_eth_dev *eth_dev,
1110 __rte_unused uint16_t queue_id, __rte_unused uint8_t stat_idx,
1111 __rte_unused uint8_t is_rx)
1112 {
1113         return 0;
1114 }
1115
1116 static struct rte_driver rte_virtio_driver = {
1117         .type = PMD_PDEV,
1118         .init = rte_virtio_pmd_init,
1119 };
1120
1121 PMD_REGISTER_DRIVER(rte_virtio_driver);