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_promiscuous_enable(struct rte_eth_dev *dev);
  70 static void virtio_dev_promiscuous_disable(struct rte_eth_dev *dev);
  71 static void virtio_dev_allmulticast_enable(struct rte_eth_dev *dev);
  72 static void virtio_dev_allmulticast_disable(struct rte_eth_dev *dev);
  73 static void virtio_dev_info_get(struct rte_eth_dev *dev,
  74                                 struct rte_eth_dev_info *dev_info);
  75 static int virtio_dev_link_update(struct rte_eth_dev *dev,
  76         __rte_unused int wait_to_complete);
  77
  78 static void virtio_set_hwaddr(struct virtio_hw *hw);
  79 static void virtio_get_hwaddr(struct virtio_hw *hw);
  80
  81 static void virtio_dev_rx_queue_release(__rte_unused void *rxq);
  82 static void virtio_dev_tx_queue_release(__rte_unused void *txq);
  83
  84 static void virtio_dev_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *stats);
  85 static void virtio_dev_stats_reset(struct rte_eth_dev *dev);
  86 static void virtio_dev_free_mbufs(struct rte_eth_dev *dev);
  87
  88 static int virtio_dev_queue_stats_mapping_set(
  89         __rte_unused struct rte_eth_dev *eth_dev,
  90         __rte_unused uint16_t queue_id,
  91         __rte_unused uint8_t stat_idx,
  92         __rte_unused uint8_t is_rx);
  93
  94 /*
  95  * The set of PCI devices this driver supports
  96  */
  97 static struct rte_pci_id pci_id_virtio_map[] = {
  98
  99 #define RTE_PCI_DEV_ID_DECL_VIRTIO(vend, dev) {RTE_PCI_DEVICE(vend, dev)},
 100 #include "rte_pci_dev_ids.h"
 101
 102 { .vendor_id = 0, /* sentinel */ },
 103 };
 104
 105 static int
 106 virtio_send_command(struct virtqueue *vq, struct virtio_pmd_ctrl *ctrl,
 107                 int *dlen, int pkt_num)
 108 {
 109         uint32_t head = vq->vq_desc_head_idx, i;
 110         int k, sum = 0;
 111         virtio_net_ctrl_ack status = ~0;
 112         struct virtio_pmd_ctrl result;
 113
 114         ctrl->status = status;
 115
 116         if (!vq->hw->cvq) {
 117                 PMD_INIT_LOG(ERR,
 118                              "%s(): Control queue is not supported.",
 119                              __func__);
 120                 return -1;
 121         }
 122
 123         PMD_INIT_LOG(DEBUG, "vq->vq_desc_head_idx = %d, status = %d, "
 124                 "vq->hw->cvq = %p vq = %p",
 125                 vq->vq_desc_head_idx, status, vq->hw->cvq, vq);
 126
 127         if ((vq->vq_free_cnt < ((uint32_t)pkt_num + 2)) || (pkt_num < 1))
 128                 return -1;
 129
 130         memcpy(vq->virtio_net_hdr_mz->addr, ctrl,
 131                 sizeof(struct virtio_pmd_ctrl));
 132
 133         /*
 134          * Format is enforced in qemu code:
 135          * One TX packet for header;
 136          * At least one TX packet per argument;
 137          * One RX packet for ACK.
 138          */
 139         vq->vq_ring.desc[head].flags = VRING_DESC_F_NEXT;
 140         vq->vq_ring.desc[head].addr = vq->virtio_net_hdr_mz->phys_addr;
 141         vq->vq_ring.desc[head].len = sizeof(struct virtio_net_ctrl_hdr);
 142         vq->vq_free_cnt--;
 143         i = vq->vq_ring.desc[head].next;
 144
 145         for (k = 0; k < pkt_num; k++) {
 146                 vq->vq_ring.desc[i].flags = VRING_DESC_F_NEXT;
 147                 vq->vq_ring.desc[i].addr = vq->virtio_net_hdr_mz->phys_addr
 148                         + sizeof(struct virtio_net_ctrl_hdr)
 149                         + sizeof(ctrl->status) + sizeof(uint8_t)*sum;
 150                 vq->vq_ring.desc[i].len = dlen[k];
 151                 sum += dlen[k];
 152                 vq->vq_free_cnt--;
 153                 i = vq->vq_ring.desc[i].next;
 154         }
 155
 156         vq->vq_ring.desc[i].flags = VRING_DESC_F_WRITE;
 157         vq->vq_ring.desc[i].addr = vq->virtio_net_hdr_mz->phys_addr
 158                         + sizeof(struct virtio_net_ctrl_hdr);
 159         vq->vq_ring.desc[i].len = sizeof(ctrl->status);
 160         vq->vq_free_cnt--;
 161
 162         vq->vq_desc_head_idx = vq->vq_ring.desc[i].next;
 163
 164         vq_update_avail_ring(vq, head);
 165         vq_update_avail_idx(vq);
 166
 167         PMD_INIT_LOG(DEBUG, "vq->vq_queue_index = %d", vq->vq_queue_index);
 168
 169         virtqueue_notify(vq);
 170
 171         while (vq->vq_used_cons_idx == vq->vq_ring.used->idx)
 172                 usleep(100);
 173
 174         while (vq->vq_used_cons_idx != vq->vq_ring.used->idx) {
 175                 uint32_t idx, desc_idx, used_idx;
 176                 struct vring_used_elem *uep;
 177
 178                 virtio_rmb();
 179
 180                 used_idx = (uint32_t)(vq->vq_used_cons_idx
 181                                 & (vq->vq_nentries - 1));
 182                 uep = &vq->vq_ring.used->ring[used_idx];
 183                 idx = (uint32_t) uep->id;
 184                 desc_idx = idx;
 185
 186                 while (vq->vq_ring.desc[desc_idx].flags & VRING_DESC_F_NEXT) {
 187                         desc_idx = vq->vq_ring.desc[desc_idx].next;
 188                         vq->vq_free_cnt++;
 189                 }
 190
 191                 vq->vq_ring.desc[desc_idx].next = vq->vq_desc_head_idx;
 192                 vq->vq_desc_head_idx = idx;
 193
 194                 vq->vq_used_cons_idx++;
 195                 vq->vq_free_cnt++;
 196         }
 197
 198         PMD_INIT_LOG(DEBUG, "vq->vq_free_cnt=%d\nvq->vq_desc_head_idx=%d",
 199                         vq->vq_free_cnt, vq->vq_desc_head_idx);
 200
 201         memcpy(&result, vq->virtio_net_hdr_mz->addr,
 202                         sizeof(struct virtio_pmd_ctrl));
 203
 204         return result.status;
 205 }
 206
 207 static int
 208 virtio_set_multiple_queues(struct rte_eth_dev *dev, uint16_t nb_queues)
 209 {
 210         struct virtio_hw *hw = dev->data->dev_private;
 211         struct virtio_pmd_ctrl ctrl;
 212         int dlen[1];
 213         int ret;
 214
 215         ctrl.hdr.class = VIRTIO_NET_CTRL_MQ;
 216         ctrl.hdr.cmd = VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET;
 217         memcpy(ctrl.data, &nb_queues, sizeof(uint16_t));
 218
 219         dlen[0] = sizeof(uint16_t);
 220
 221         ret = virtio_send_command(hw->cvq, &ctrl, dlen, 1);
 222
 223         if (ret) {
 224                 PMD_INIT_LOG(ERR, "Multiqueue configured but send command "
 225                           "failed, this is too late now...");
 226                 return -EINVAL;
 227         }
 228
 229         return 0;
 230 }
 231
 232 int virtio_dev_queue_setup(struct rte_eth_dev *dev,
 233                         int queue_type,
 234                         uint16_t queue_idx,
 235                         uint8_t  vtpci_queue_idx,
 236                         uint16_t nb_desc,
 237                         unsigned int socket_id,
 238                         struct virtqueue **pvq)
 239 {
 240         char vq_name[VIRTQUEUE_MAX_NAME_SZ];
 241         const struct rte_memzone *mz;
 242         uint16_t vq_size;
 243         int size;
 244         struct virtio_hw *hw = dev->data->dev_private;
 245         struct virtqueue  *vq = NULL;
 246
 247         /* Write the virtqueue index to the Queue Select Field */
 248         VIRTIO_WRITE_REG_2(hw, VIRTIO_PCI_QUEUE_SEL, vtpci_queue_idx);
 249         PMD_INIT_LOG(DEBUG, "selecting queue: %d", vtpci_queue_idx);
 250
 251         /*
 252          * Read the virtqueue size from the Queue Size field
 253          * Always power of 2 and if 0 virtqueue does not exist
 254          */
 255         vq_size = VIRTIO_READ_REG_2(hw, VIRTIO_PCI_QUEUE_NUM);
 256         PMD_INIT_LOG(DEBUG, "vq_size: %d nb_desc:%d", vq_size, nb_desc);
 257         if (nb_desc == 0)
 258                 nb_desc = vq_size;
 259         if (vq_size == 0) {
 260                 PMD_INIT_LOG(ERR, "%s: virtqueue does not exist", __func__);
 261                 return -EINVAL;
 262         } else if (!rte_is_power_of_2(vq_size)) {
 263                 PMD_INIT_LOG(ERR, "%s: virtqueue size is not powerof 2", __func__);
 264                 return -EINVAL;
 265         } else if (nb_desc != vq_size) {
 266                 PMD_INIT_LOG(ERR, "Warning: nb_desc(%d) is not equal to vq size (%d), fall to vq size",
 267                         nb_desc, vq_size);
 268                 nb_desc = vq_size;
 269         }
 270
 271         if (queue_type == VTNET_RQ) {
 272                 snprintf(vq_name, sizeof(vq_name), "port%d_rvq%d",
 273                         dev->data->port_id, queue_idx);
 274                 vq = rte_zmalloc(vq_name, sizeof(struct virtqueue) +
 275                         vq_size * sizeof(struct vq_desc_extra), RTE_CACHE_LINE_SIZE);
 276         } else if (queue_type == VTNET_TQ) {
 277                 snprintf(vq_name, sizeof(vq_name), "port%d_tvq%d",
 278                         dev->data->port_id, queue_idx);
 279                 vq = rte_zmalloc(vq_name, sizeof(struct virtqueue) +
 280                         vq_size * sizeof(struct vq_desc_extra), RTE_CACHE_LINE_SIZE);
 281         } else if (queue_type == VTNET_CQ) {
 282                 snprintf(vq_name, sizeof(vq_name), "port%d_cvq",
 283                         dev->data->port_id);
 284                 vq = rte_zmalloc(vq_name, sizeof(struct virtqueue) +
 285                         vq_size * sizeof(struct vq_desc_extra),
 286                         RTE_CACHE_LINE_SIZE);
 287         }
 288         if (vq == NULL) {
 289                 PMD_INIT_LOG(ERR, "%s: Can not allocate virtqueue", __func__);
 290                 return (-ENOMEM);
 291         }
 292
 293         vq->hw = hw;
 294         vq->port_id = dev->data->port_id;
 295         vq->queue_id = queue_idx;
 296         vq->vq_queue_index = vtpci_queue_idx;
 297         vq->vq_nentries = vq_size;
 298         vq->vq_free_cnt = vq_size;
 299
 300         /*
 301          * Reserve a memzone for vring elements
 302          */
 303         size = vring_size(vq_size, VIRTIO_PCI_VRING_ALIGN);
 304         vq->vq_ring_size = RTE_ALIGN_CEIL(size, VIRTIO_PCI_VRING_ALIGN);
 305         PMD_INIT_LOG(DEBUG, "vring_size: %d, rounded_vring_size: %d", size, vq->vq_ring_size);
 306
 307         mz = rte_memzone_reserve_aligned(vq_name, vq->vq_ring_size,
 308                 socket_id, 0, VIRTIO_PCI_VRING_ALIGN);
 309         if (mz == NULL) {
 310                 rte_free(vq);
 311                 return -ENOMEM;
 312         }
 313
 314         /*
 315          * Virtio PCI device VIRTIO_PCI_QUEUE_PF register is 32bit,
 316          * and only accepts 32 bit page frame number.
 317          * Check if the allocated physical memory exceeds 16TB.
 318          */
 319         if ((mz->phys_addr + vq->vq_ring_size - 1) >> (VIRTIO_PCI_QUEUE_ADDR_SHIFT + 32)) {
 320                 PMD_INIT_LOG(ERR, "vring address shouldn't be above 16TB!");
 321                 rte_free(vq);
 322                 return -ENOMEM;
 323         }
 324
 325         memset(mz->addr, 0, sizeof(mz->len));
 326         vq->mz = mz;
 327         vq->vq_ring_mem = mz->phys_addr;
 328         vq->vq_ring_virt_mem = mz->addr;
 329         PMD_INIT_LOG(DEBUG, "vq->vq_ring_mem:      0x%"PRIx64, (uint64_t)mz->phys_addr);
 330         PMD_INIT_LOG(DEBUG, "vq->vq_ring_virt_mem: 0x%"PRIx64, (uint64_t)mz->addr);
 331         vq->virtio_net_hdr_mz  = NULL;
 332         vq->virtio_net_hdr_mem = 0;
 333
 334         if (queue_type == VTNET_TQ) {
 335                 /*
 336                  * For each xmit packet, allocate a virtio_net_hdr
 337                  */
 338                 snprintf(vq_name, sizeof(vq_name), "port%d_tvq%d_hdrzone",
 339                         dev->data->port_id, queue_idx);
 340                 vq->virtio_net_hdr_mz = rte_memzone_reserve_aligned(vq_name,
 341                         vq_size * hw->vtnet_hdr_size,
 342                         socket_id, 0, RTE_CACHE_LINE_SIZE);
 343                 if (vq->virtio_net_hdr_mz == NULL) {
 344                         rte_free(vq);
 345                         return -ENOMEM;
 346                 }
 347                 vq->virtio_net_hdr_mem =
 348                         vq->virtio_net_hdr_mz->phys_addr;
 349                 memset(vq->virtio_net_hdr_mz->addr, 0,
 350                         vq_size * hw->vtnet_hdr_size);
 351         } else if (queue_type == VTNET_CQ) {
 352                 /* Allocate a page for control vq command, data and status */
 353                 snprintf(vq_name, sizeof(vq_name), "port%d_cvq_hdrzone",
 354                         dev->data->port_id);
 355                 vq->virtio_net_hdr_mz = rte_memzone_reserve_aligned(vq_name,
 356                         PAGE_SIZE, socket_id, 0, RTE_CACHE_LINE_SIZE);
 357                 if (vq->virtio_net_hdr_mz == NULL) {
 358                         rte_free(vq);
 359                         return -ENOMEM;
 360                 }
 361                 vq->virtio_net_hdr_mem =
 362                         vq->virtio_net_hdr_mz->phys_addr;
 363                 memset(vq->virtio_net_hdr_mz->addr, 0, PAGE_SIZE);
 364         }
 365
 366         /*
 367          * Set guest physical address of the virtqueue
 368          * in VIRTIO_PCI_QUEUE_PFN config register of device
 369          */
 370         VIRTIO_WRITE_REG_4(hw, VIRTIO_PCI_QUEUE_PFN,
 371                         mz->phys_addr >> VIRTIO_PCI_QUEUE_ADDR_SHIFT);
 372         *pvq = vq;
 373         return 0;
 374 }
 375
 376 static int
 377 virtio_dev_cq_queue_setup(struct rte_eth_dev *dev, uint16_t vtpci_queue_idx,
 378                 uint32_t socket_id)
 379 {
 380         struct virtqueue *vq;
 381         uint16_t nb_desc = 0;
 382         int ret;
 383         struct virtio_hw *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 static void
 407 virtio_dev_promiscuous_enable(struct rte_eth_dev *dev)
 408 {
 409         struct virtio_hw *hw = dev->data->dev_private;
 410         struct virtio_pmd_ctrl ctrl;
 411         int dlen[1];
 412         int ret;
 413
 414         ctrl.hdr.class = VIRTIO_NET_CTRL_RX;
 415         ctrl.hdr.cmd = VIRTIO_NET_CTRL_RX_PROMISC;
 416         ctrl.data[0] = 1;
 417         dlen[0] = 1;
 418
 419         ret = virtio_send_command(hw->cvq, &ctrl, dlen, 1);
 420
 421         if (ret)
 422                 PMD_INIT_LOG(ERR, "Failed to enable promisc");
 423 }
 424
 425 static void
 426 virtio_dev_promiscuous_disable(struct rte_eth_dev *dev)
 427 {
 428         struct virtio_hw *hw = dev->data->dev_private;
 429         struct virtio_pmd_ctrl ctrl;
 430         int dlen[1];
 431         int ret;
 432
 433         ctrl.hdr.class = VIRTIO_NET_CTRL_RX;
 434         ctrl.hdr.cmd = VIRTIO_NET_CTRL_RX_PROMISC;
 435         ctrl.data[0] = 0;
 436         dlen[0] = 1;
 437
 438         ret = virtio_send_command(hw->cvq, &ctrl, dlen, 1);
 439
 440         if (ret)
 441                 PMD_INIT_LOG(ERR, "Failed to disable promisc");
 442 }
 443
 444 static void
 445 virtio_dev_allmulticast_enable(struct rte_eth_dev *dev)
 446 {
 447         struct virtio_hw *hw = dev->data->dev_private;
 448         struct virtio_pmd_ctrl ctrl;
 449         int dlen[1];
 450         int ret;
 451
 452         ctrl.hdr.class = VIRTIO_NET_CTRL_RX;
 453         ctrl.hdr.cmd = VIRTIO_NET_CTRL_RX_ALLMULTI;
 454         ctrl.data[0] = 1;
 455         dlen[0] = 1;
 456
 457         ret = virtio_send_command(hw->cvq, &ctrl, dlen, 1);
 458
 459         if (ret)
 460                 PMD_INIT_LOG(ERR, "Failed to enable allmulticast");
 461 }
 462
 463 static void
 464 virtio_dev_allmulticast_disable(struct rte_eth_dev *dev)
 465 {
 466         struct virtio_hw *hw = dev->data->dev_private;
 467         struct virtio_pmd_ctrl ctrl;
 468         int dlen[1];
 469         int ret;
 470
 471         ctrl.hdr.class = VIRTIO_NET_CTRL_RX;
 472         ctrl.hdr.cmd = VIRTIO_NET_CTRL_RX_ALLMULTI;
 473         ctrl.data[0] = 0;
 474         dlen[0] = 1;
 475
 476         ret = virtio_send_command(hw->cvq, &ctrl, dlen, 1);
 477
 478         if (ret)
 479                 PMD_INIT_LOG(ERR, "Failed to disable allmulticast");
 480 }
 481
 482 /*
 483  * dev_ops for virtio, bare necessities for basic operation
 484  */
 485 static struct eth_dev_ops virtio_eth_dev_ops = {
 486         .dev_configure           = virtio_dev_configure,
 487         .dev_start               = virtio_dev_start,
 488         .dev_stop                = virtio_dev_stop,
 489         .dev_close               = virtio_dev_close,
 490         .promiscuous_enable      = virtio_dev_promiscuous_enable,
 491         .promiscuous_disable     = virtio_dev_promiscuous_disable,
 492         .allmulticast_enable     = virtio_dev_allmulticast_enable,
 493         .allmulticast_disable    = virtio_dev_allmulticast_disable,
 494
 495         .dev_infos_get           = virtio_dev_info_get,
 496         .stats_get               = virtio_dev_stats_get,
 497         .stats_reset             = virtio_dev_stats_reset,
 498         .link_update             = virtio_dev_link_update,
 499         .mac_addr_add            = NULL,
 500         .mac_addr_remove         = NULL,
 501         .rx_queue_setup          = virtio_dev_rx_queue_setup,
 502         /* meaningfull only to multiple queue */
 503         .rx_queue_release        = virtio_dev_rx_queue_release,
 504         .tx_queue_setup          = virtio_dev_tx_queue_setup,
 505         /* meaningfull only to multiple queue */
 506         .tx_queue_release        = virtio_dev_tx_queue_release,
 507         /* collect stats per queue */
 508         .queue_stats_mapping_set = virtio_dev_queue_stats_mapping_set,
 509 };
 510
 511 static inline int
 512 virtio_dev_atomic_read_link_status(struct rte_eth_dev *dev,
 513                                 struct rte_eth_link *link)
 514 {
 515         struct rte_eth_link *dst = link;
 516         struct rte_eth_link *src = &(dev->data->dev_link);
 517
 518         if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
 519                         *(uint64_t *)src) == 0)
 520                 return -1;
 521
 522         return 0;
 523 }
 524
 525 /**
 526  * Atomically writes the link status information into global
 527  * structure rte_eth_dev.
 528  *
 529  * @param dev
 530  *   - Pointer to the structure rte_eth_dev to read from.
 531  *   - Pointer to the buffer to be saved with the link status.
 532  *
 533  * @return
 534  *   - On success, zero.
 535  *   - On failure, negative value.
 536  */
 537 static inline int
 538 virtio_dev_atomic_write_link_status(struct rte_eth_dev *dev,
 539                 struct rte_eth_link *link)
 540 {
 541         struct rte_eth_link *dst = &(dev->data->dev_link);
 542         struct rte_eth_link *src = link;
 543
 544         if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
 545                                         *(uint64_t *)src) == 0)
 546                 return -1;
 547
 548         return 0;
 549 }
 550
 551 static void
 552 virtio_dev_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *stats)
 553 {
 554         unsigned i;
 555
 556         for (i = 0; i < dev->data->nb_tx_queues; i++) {
 557                 const struct virtqueue *txvq = dev->data->tx_queues[i];
 558                 if (txvq == NULL)
 559                         continue;
 560
 561                 stats->opackets += txvq->packets;
 562                 stats->obytes += txvq->bytes;
 563                 stats->oerrors += txvq->errors;
 564
 565                 if (i < RTE_ETHDEV_QUEUE_STAT_CNTRS) {
 566                         stats->q_opackets[i] = txvq->packets;
 567                         stats->q_obytes[i] = txvq->bytes;
 568                 }
 569         }
 570
 571         for (i = 0; i < dev->data->nb_rx_queues; i++) {
 572                 const struct virtqueue *rxvq = dev->data->rx_queues[i];
 573                 if (rxvq == NULL)
 574                         continue;
 575
 576                 stats->ipackets += rxvq->packets;
 577                 stats->ibytes += rxvq->bytes;
 578                 stats->ierrors += rxvq->errors;
 579
 580                 if (i < RTE_ETHDEV_QUEUE_STAT_CNTRS) {
 581                         stats->q_ipackets[i] = rxvq->packets;
 582                         stats->q_ibytes[i] = rxvq->bytes;
 583                 }
 584         }
 585
 586         stats->rx_nombuf = dev->data->rx_mbuf_alloc_failed;
 587 }
 588
 589 static void
 590 virtio_dev_stats_reset(struct rte_eth_dev *dev)
 591 {
 592         unsigned int i;
 593
 594         for (i = 0; i < dev->data->nb_tx_queues; i++) {
 595                 struct virtqueue *txvq = dev->data->tx_queues[i];
 596                 if (txvq == NULL)
 597                         continue;
 598
 599                 txvq->packets = 0;
 600                 txvq->bytes = 0;
 601                 txvq->errors = 0;
 602         }
 603
 604         for (i = 0; i < dev->data->nb_rx_queues; i++) {
 605                 struct virtqueue *rxvq = dev->data->rx_queues[i];
 606                 if (rxvq == NULL)
 607                         continue;
 608
 609                 rxvq->packets = 0;
 610                 rxvq->bytes = 0;
 611                 rxvq->errors = 0;
 612         }
 613
 614         dev->data->rx_mbuf_alloc_failed = 0;
 615 }
 616
 617 static void
 618 virtio_set_hwaddr(struct virtio_hw *hw)
 619 {
 620         vtpci_write_dev_config(hw,
 621                         offsetof(struct virtio_net_config, mac),
 622                         &hw->mac_addr, ETHER_ADDR_LEN);
 623 }
 624
 625 static void
 626 virtio_get_hwaddr(struct virtio_hw *hw)
 627 {
 628         if (vtpci_with_feature(hw, VIRTIO_NET_F_MAC)) {
 629                 vtpci_read_dev_config(hw,
 630                         offsetof(struct virtio_net_config, mac),
 631                         &hw->mac_addr, ETHER_ADDR_LEN);
 632         } else {
 633                 eth_random_addr(&hw->mac_addr[0]);
 634                 virtio_set_hwaddr(hw);
 635         }
 636 }
 637
 638
 639 static void
 640 virtio_negotiate_features(struct virtio_hw *hw)
 641 {
 642         uint32_t host_features, mask;
 643
 644         mask = VIRTIO_NET_F_CTRL_VLAN;
 645         mask |= VIRTIO_NET_F_CSUM | VIRTIO_NET_F_GUEST_CSUM;
 646
 647         /* TSO and LRO are only available when their corresponding
 648          * checksum offload feature is also negotiated.
 649          */
 650         mask |= VIRTIO_NET_F_HOST_TSO4 | VIRTIO_NET_F_HOST_TSO6 | VIRTIO_NET_F_HOST_ECN;
 651         mask |= VIRTIO_NET_F_GUEST_TSO4 | VIRTIO_NET_F_GUEST_TSO6 | VIRTIO_NET_F_GUEST_ECN;
 652         mask |= VTNET_LRO_FEATURES;
 653
 654         /* not negotiating INDIRECT descriptor table support */
 655         mask |= VIRTIO_RING_F_INDIRECT_DESC;
 656
 657         /* Prepare guest_features: feature that driver wants to support */
 658         hw->guest_features = VTNET_FEATURES & ~mask;
 659         PMD_INIT_LOG(DEBUG, "guest_features before negotiate = %x",
 660                 hw->guest_features);
 661
 662         /* Read device(host) feature bits */
 663         host_features = VIRTIO_READ_REG_4(hw, VIRTIO_PCI_HOST_FEATURES);
 664         PMD_INIT_LOG(DEBUG, "host_features before negotiate = %x",
 665                 host_features);
 666
 667         /*
 668          * Negotiate features: Subset of device feature bits are written back
 669          * guest feature bits.
 670          */
 671         hw->guest_features = vtpci_negotiate_features(hw, host_features);
 672         PMD_INIT_LOG(DEBUG, "features after negotiate = %x",
 673                 hw->guest_features);
 674 }
 675
 676 #ifdef RTE_EXEC_ENV_LINUXAPP
 677 static int
 678 parse_sysfs_value(const char *filename, unsigned long *val)
 679 {
 680         FILE *f;
 681         char buf[BUFSIZ];
 682         char *end = NULL;
 683
 684         f = fopen(filename, "r");
 685         if (f == NULL) {
 686                 PMD_INIT_LOG(ERR, "%s(): cannot open sysfs value %s",
 687                              __func__, filename);
 688                 return -1;
 689         }
 690
 691         if (fgets(buf, sizeof(buf), f) == NULL) {
 692                 PMD_INIT_LOG(ERR, "%s(): cannot read sysfs value %s",
 693                              __func__, filename);
 694                 fclose(f);
 695                 return -1;
 696         }
 697         *val = strtoul(buf, &end, 0);
 698         if ((buf[0] == '\0') || (end == NULL) || (*end != '\n')) {
 699                 PMD_INIT_LOG(ERR, "%s(): cannot parse sysfs value %s",
 700                              __func__, filename);
 701                 fclose(f);
 702                 return -1;
 703         }
 704         fclose(f);
 705         return 0;
 706 }
 707
 708 static int get_uio_dev(struct rte_pci_addr *loc, char *buf, unsigned int buflen)
 709 {
 710         unsigned int uio_num;
 711         struct dirent *e;
 712         DIR *dir;
 713         char dirname[PATH_MAX];
 714
 715         /* depending on kernel version, uio can be located in uio/uioX
 716          * or uio:uioX */
 717         snprintf(dirname, sizeof(dirname),
 718                      SYSFS_PCI_DEVICES "/" PCI_PRI_FMT "/uio",
 719                      loc->domain, loc->bus, loc->devid, loc->function);
 720         dir = opendir(dirname);
 721         if (dir == NULL) {
 722                 /* retry with the parent directory */
 723                 snprintf(dirname, sizeof(dirname),
 724                              SYSFS_PCI_DEVICES "/" PCI_PRI_FMT,
 725                              loc->domain, loc->bus, loc->devid, loc->function);
 726                 dir = opendir(dirname);
 727
 728                 if (dir == NULL) {
 729                         PMD_INIT_LOG(ERR, "Cannot opendir %s", dirname);
 730                         return -1;
 731                 }
 732         }
 733
 734         /* take the first file starting with "uio" */
 735         while ((e = readdir(dir)) != NULL) {
 736                 /* format could be uio%d ...*/
 737                 int shortprefix_len = sizeof("uio") - 1;
 738                 /* ... or uio:uio%d */
 739                 int longprefix_len = sizeof("uio:uio") - 1;
 740                 char *endptr;
 741
 742                 if (strncmp(e->d_name, "uio", 3) != 0)
 743                         continue;
 744
 745                 /* first try uio%d */
 746                 errno = 0;
 747                 uio_num = strtoull(e->d_name + shortprefix_len, &endptr, 10);
 748                 if (errno == 0 && endptr != (e->d_name + shortprefix_len)) {
 749                         snprintf(buf, buflen, "%s/uio%u", dirname, uio_num);
 750                         break;
 751                 }
 752
 753                 /* then try uio:uio%d */
 754                 errno = 0;
 755                 uio_num = strtoull(e->d_name + longprefix_len, &endptr, 10);
 756                 if (errno == 0 && endptr != (e->d_name + longprefix_len)) {
 757                         snprintf(buf, buflen, "%s/uio:uio%u", dirname,
 758                                      uio_num);
 759                         break;
 760                 }
 761         }
 762         closedir(dir);
 763
 764         /* No uio resource found */
 765         if (e == NULL) {
 766                 PMD_INIT_LOG(ERR, "Could not find uio resource");
 767                 return -1;
 768         }
 769
 770         return 0;
 771 }
 772
 773 static int
 774 virtio_has_msix(const struct rte_pci_addr *loc)
 775 {
 776         DIR *d;
 777         char dirname[PATH_MAX];
 778
 779         snprintf(dirname, sizeof(dirname),
 780                      SYSFS_PCI_DEVICES "/" PCI_PRI_FMT "/msi_irqs",
 781                      loc->domain, loc->bus, loc->devid, loc->function);
 782
 783         d = opendir(dirname);
 784         if (d)
 785                 closedir(d);
 786
 787         return (d != NULL);
 788 }
 789
 790 /* Extract I/O port numbers from sysfs */
 791 static int virtio_resource_init(struct rte_pci_device *pci_dev)
 792 {
 793         char dirname[PATH_MAX];
 794         char filename[PATH_MAX];
 795         unsigned long start, size;
 796
 797         if (get_uio_dev(&pci_dev->addr, dirname, sizeof(dirname)) < 0)
 798                 return -1;
 799
 800         /* get portio size */
 801         snprintf(filename, sizeof(filename),
 802                      "%s/portio/port0/size", dirname);
 803         if (parse_sysfs_value(filename, &size) < 0) {
 804                 PMD_INIT_LOG(ERR, "%s(): cannot parse size",
 805                              __func__);
 806                 return -1;
 807         }
 808
 809         /* get portio start */
 810         snprintf(filename, sizeof(filename),
 811                  "%s/portio/port0/start", dirname);
 812         if (parse_sysfs_value(filename, &start) < 0) {
 813                 PMD_INIT_LOG(ERR, "%s(): cannot parse portio start",
 814                              __func__);
 815                 return -1;
 816         }
 817         pci_dev->mem_resource[0].addr = (void *)(uintptr_t)start;
 818         pci_dev->mem_resource[0].len =  (uint64_t)size;
 819         PMD_INIT_LOG(DEBUG,
 820                      "PCI Port IO found start=0x%lx with size=0x%lx",
 821                      start, size);
 822         return 0;
 823 }
 824 #else
 825 static int
 826 virtio_has_msix(const struct rte_pci_addr *loc __rte_unused)
 827 {
 828         /* nic_uio does not enable interrupts, return 0 (false). */
 829         return 0;
 830 }
 831
 832 static int virtio_resource_init(struct rte_pci_device *pci_dev __rte_unused)
 833 {
 834         /* no setup required */
 835         return 0;
 836 }
 837 #endif
 838
 839 /*
 840  * Process Virtio Config changed interrupt and call the callback
 841  * if link state changed.
 842  */
 843 static void
 844 virtio_interrupt_handler(__rte_unused struct rte_intr_handle *handle,
 845                          void *param)
 846 {
 847         struct rte_eth_dev *dev = param;
 848         struct virtio_hw *hw = dev->data->dev_private;
 849         uint8_t isr;
 850
 851         /* Read interrupt status which clears interrupt */
 852         isr = vtpci_isr(hw);
 853         PMD_DRV_LOG(INFO, "interrupt status = %#x", isr);
 854
 855         if (rte_intr_enable(&dev->pci_dev->intr_handle) < 0)
 856                 PMD_DRV_LOG(ERR, "interrupt enable failed");
 857
 858         if (isr & VIRTIO_PCI_ISR_CONFIG) {
 859                 if (virtio_dev_link_update(dev, 0) == 0)
 860                         _rte_eth_dev_callback_process(dev,
 861                                                       RTE_ETH_EVENT_INTR_LSC);
 862         }
 863
 864 }
 865
 866 /*
 867  * This function is based on probe() function in virtio_pci.c
 868  * It returns 0 on success.
 869  */
 870 static int
 871 eth_virtio_dev_init(__rte_unused struct eth_driver *eth_drv,
 872                 struct rte_eth_dev *eth_dev)
 873 {
 874         struct virtio_hw *hw = eth_dev->data->dev_private;
 875         struct virtio_net_config *config;
 876         struct virtio_net_config local_config;
 877         uint32_t offset_conf = sizeof(config->mac);
 878         struct rte_pci_device *pci_dev;
 879
 880         RTE_BUILD_BUG_ON(RTE_PKTMBUF_HEADROOM < sizeof(struct virtio_net_hdr));
 881
 882         eth_dev->dev_ops = &virtio_eth_dev_ops;
 883         eth_dev->tx_pkt_burst = &virtio_xmit_pkts;
 884
 885         if (rte_eal_process_type() == RTE_PROC_SECONDARY)
 886                 return 0;
 887
 888         /* Allocate memory for storing MAC addresses */
 889         eth_dev->data->mac_addrs = rte_zmalloc("virtio", ETHER_ADDR_LEN, 0);
 890         if (eth_dev->data->mac_addrs == NULL) {
 891                 PMD_INIT_LOG(ERR,
 892                         "Failed to allocate %d bytes needed to store MAC addresses",
 893                         ETHER_ADDR_LEN);
 894                 return -ENOMEM;
 895         }
 896
 897         pci_dev = eth_dev->pci_dev;
 898         if (virtio_resource_init(pci_dev) < 0)
 899                 return -1;
 900
 901         hw->use_msix = virtio_has_msix(&pci_dev->addr);
 902         hw->io_base = (uint32_t)(uintptr_t)pci_dev->mem_resource[0].addr;
 903
 904         /* Reset the device although not necessary at startup */
 905         vtpci_reset(hw);
 906
 907         /* Tell the host we've noticed this device. */
 908         vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_ACK);
 909
 910         /* Tell the host we've known how to drive the device. */
 911         vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_DRIVER);
 912         virtio_negotiate_features(hw);
 913
 914         /* Setting up rx_header size for the device */
 915         if (vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) {
 916                 eth_dev->rx_pkt_burst = &virtio_recv_mergeable_pkts;
 917                 hw->vtnet_hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf);
 918         } else {
 919                 eth_dev->rx_pkt_burst = &virtio_recv_pkts;
 920                 hw->vtnet_hdr_size = sizeof(struct virtio_net_hdr);
 921         }
 922
 923         /* Copy the permanent MAC address to: virtio_hw */
 924         virtio_get_hwaddr(hw);
 925         ether_addr_copy((struct ether_addr *) hw->mac_addr,
 926                         &eth_dev->data->mac_addrs[0]);
 927         PMD_INIT_LOG(DEBUG,
 928                      "PORT MAC: %02X:%02X:%02X:%02X:%02X:%02X",
 929                      hw->mac_addr[0], hw->mac_addr[1], hw->mac_addr[2],
 930                      hw->mac_addr[3], hw->mac_addr[4], hw->mac_addr[5]);
 931
 932         if (vtpci_with_feature(hw, VIRTIO_NET_F_CTRL_VQ)) {
 933                 config = &local_config;
 934
 935                 if (vtpci_with_feature(hw, VIRTIO_NET_F_STATUS)) {
 936                         offset_conf += sizeof(config->status);
 937                 } else {
 938                         PMD_INIT_LOG(DEBUG,
 939                                      "VIRTIO_NET_F_STATUS is not supported");
 940                         config->status = 0;
 941                 }
 942
 943                 if (vtpci_with_feature(hw, VIRTIO_NET_F_MQ)) {
 944                         offset_conf += sizeof(config->max_virtqueue_pairs);
 945                 } else {
 946                         PMD_INIT_LOG(DEBUG,
 947                                      "VIRTIO_NET_F_MQ is not supported");
 948                         config->max_virtqueue_pairs = 1;
 949                 }
 950
 951                 vtpci_read_dev_config(hw, 0, (uint8_t *)config, offset_conf);
 952
 953                 hw->max_rx_queues =
 954                         (VIRTIO_MAX_RX_QUEUES < config->max_virtqueue_pairs) ?
 955                         VIRTIO_MAX_RX_QUEUES : config->max_virtqueue_pairs;
 956                 hw->max_tx_queues =
 957                         (VIRTIO_MAX_TX_QUEUES < config->max_virtqueue_pairs) ?
 958                         VIRTIO_MAX_TX_QUEUES : config->max_virtqueue_pairs;
 959
 960                 virtio_dev_cq_queue_setup(eth_dev,
 961                                         config->max_virtqueue_pairs * 2,
 962                                         SOCKET_ID_ANY);
 963
 964                 PMD_INIT_LOG(DEBUG, "config->max_virtqueue_pairs=%d",
 965                                 config->max_virtqueue_pairs);
 966                 PMD_INIT_LOG(DEBUG, "config->status=%d", config->status);
 967                 PMD_INIT_LOG(DEBUG,
 968                                 "PORT MAC: %02X:%02X:%02X:%02X:%02X:%02X",
 969                                 config->mac[0], config->mac[1],
 970                                 config->mac[2], config->mac[3],
 971                                 config->mac[4], config->mac[5]);
 972         } else {
 973                 hw->max_rx_queues = 1;
 974                 hw->max_tx_queues = 1;
 975         }
 976
 977         eth_dev->data->nb_rx_queues = hw->max_rx_queues;
 978         eth_dev->data->nb_tx_queues = hw->max_tx_queues;
 979
 980         PMD_INIT_LOG(DEBUG, "hw->max_rx_queues=%d   hw->max_tx_queues=%d",
 981                         hw->max_rx_queues, hw->max_tx_queues);
 982         PMD_INIT_LOG(DEBUG, "port %d vendorID=0x%x deviceID=0x%x",
 983                         eth_dev->data->port_id, pci_dev->id.vendor_id,
 984                         pci_dev->id.device_id);
 985
 986         /* Setup interrupt callback  */
 987         rte_intr_callback_register(&pci_dev->intr_handle,
 988                                    virtio_interrupt_handler, eth_dev);
 989         return 0;
 990 }
 991
 992 static struct eth_driver rte_virtio_pmd = {
 993         {
 994                 .name = "rte_virtio_pmd",
 995                 .id_table = pci_id_virtio_map,
 996                 .drv_flags = RTE_PCI_DRV_NEED_MAPPING | RTE_PCI_DRV_INTR_LSC,
 997         },
 998         .eth_dev_init = eth_virtio_dev_init,
 999         .dev_private_size = sizeof(struct virtio_hw),
1000 };
1001
1002 /*
1003  * Driver initialization routine.
1004  * Invoked once at EAL init time.
1005  * Register itself as the [Poll Mode] Driver of PCI virtio devices.
1006  * Returns 0 on success.
1007  */
1008 static int
1009 rte_virtio_pmd_init(const char *name __rte_unused,
1010                     const char *param __rte_unused)
1011 {
1012         if (rte_eal_iopl_init() != 0) {
1013                 PMD_INIT_LOG(ERR, "IOPL call failed - cannot use virtio PMD");
1014                 return -1;
1015         }
1016
1017         rte_eth_driver_register(&rte_virtio_pmd);
1018         return 0;
1019 }
1020
1021 /*
1022  * Only 1 queue is supported, no queue release related operation
1023  */
1024 static void
1025 virtio_dev_rx_queue_release(__rte_unused void *rxq)
1026 {
1027 }
1028
1029 static void
1030 virtio_dev_tx_queue_release(__rte_unused void *txq)
1031 {
1032 }
1033
1034 /*
1035  * Configure virtio device
1036  * It returns 0 on success.
1037  */
1038 static int
1039 virtio_dev_configure(struct rte_eth_dev *dev)
1040 {
1041         const struct rte_eth_rxmode *rxmode = &dev->data->dev_conf.rxmode;
1042         struct virtio_hw *hw = dev->data->dev_private;
1043         int ret;
1044
1045         PMD_INIT_LOG(DEBUG, "configure");
1046
1047         if (rxmode->hw_ip_checksum) {
1048                 PMD_DRV_LOG(ERR, "HW IP checksum not supported");
1049                 return (-EINVAL);
1050         }
1051
1052         hw->vlan_strip = rxmode->hw_vlan_strip;
1053
1054         ret = vtpci_irq_config(hw, 0);
1055         if (ret != 0)
1056                 PMD_DRV_LOG(ERR, "failed to set config vector");
1057
1058         return ret;
1059 }
1060
1061
1062 static int
1063 virtio_dev_start(struct rte_eth_dev *dev)
1064 {
1065         uint16_t nb_queues, i;
1066         struct virtio_hw *hw = dev->data->dev_private;
1067
1068         /* Tell the host we've noticed this device. */
1069         vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_ACK);
1070
1071         /* Tell the host we've known how to drive the device. */
1072         vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_DRIVER);
1073
1074         virtio_dev_cq_start(dev);
1075
1076         /* Do final configuration before rx/tx engine starts */
1077         virtio_dev_rxtx_start(dev);
1078
1079         /* check if lsc interrupt feature is enabled */
1080         if (dev->data->dev_conf.intr_conf.lsc) {
1081                 if (!vtpci_with_feature(hw, VIRTIO_NET_F_STATUS)) {
1082                         PMD_DRV_LOG(ERR, "link status not supported by host");
1083                         return -ENOTSUP;
1084                 }
1085
1086                 if (rte_intr_enable(&dev->pci_dev->intr_handle) < 0) {
1087                         PMD_DRV_LOG(ERR, "interrupt enable failed");
1088                         return -EIO;
1089                 }
1090         }
1091
1092         /* Initialize Link state */
1093         virtio_dev_link_update(dev, 0);
1094
1095         vtpci_reinit_complete(hw);
1096
1097         /*Notify the backend
1098          *Otherwise the tap backend might already stop its queue due to fullness.
1099          *vhost backend will have no chance to be waked up
1100          */
1101         nb_queues = dev->data->nb_rx_queues;
1102         if (nb_queues > 1) {
1103                 if (virtio_set_multiple_queues(dev, nb_queues) != 0)
1104                         return -EINVAL;
1105         }
1106
1107         PMD_INIT_LOG(DEBUG, "nb_queues=%d", nb_queues);
1108
1109         for (i = 0; i < nb_queues; i++)
1110                 virtqueue_notify(dev->data->rx_queues[i]);
1111
1112         PMD_INIT_LOG(DEBUG, "Notified backend at initialization");
1113
1114         for (i = 0; i < dev->data->nb_rx_queues; i++)
1115                 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->rx_queues[i]);
1116
1117         for (i = 0; i < dev->data->nb_tx_queues; i++)
1118                 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->tx_queues[i]);
1119
1120         return 0;
1121 }
1122
1123 static void virtio_dev_free_mbufs(struct rte_eth_dev *dev)
1124 {
1125         struct rte_mbuf *buf;
1126         int i, mbuf_num = 0;
1127
1128         for (i = 0; i < dev->data->nb_rx_queues; i++) {
1129                 PMD_INIT_LOG(DEBUG,
1130                              "Before freeing rxq[%d] used and unused buf", i);
1131                 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->rx_queues[i]);
1132
1133                 while ((buf = (struct rte_mbuf *)virtqueue_detatch_unused(
1134                                         dev->data->rx_queues[i])) != NULL) {
1135                         rte_pktmbuf_free(buf);
1136                         mbuf_num++;
1137                 }
1138
1139                 PMD_INIT_LOG(DEBUG, "free %d mbufs", mbuf_num);
1140                 PMD_INIT_LOG(DEBUG,
1141                              "After freeing rxq[%d] used and unused buf", i);
1142                 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->rx_queues[i]);
1143         }
1144
1145         for (i = 0; i < dev->data->nb_tx_queues; i++) {
1146                 PMD_INIT_LOG(DEBUG,
1147                              "Before freeing txq[%d] used and unused bufs",
1148                              i);
1149                 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->tx_queues[i]);
1150
1151                 mbuf_num = 0;
1152                 while ((buf = (struct rte_mbuf *)virtqueue_detatch_unused(
1153                                         dev->data->tx_queues[i])) != NULL) {
1154                         rte_pktmbuf_free(buf);
1155
1156                         mbuf_num++;
1157                 }
1158
1159                 PMD_INIT_LOG(DEBUG, "free %d mbufs", mbuf_num);
1160                 PMD_INIT_LOG(DEBUG,
1161                              "After freeing txq[%d] used and unused buf", i);
1162                 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->tx_queues[i]);
1163         }
1164 }
1165
1166 /*
1167  * Stop device: disable rx and tx functions to allow for reconfiguring.
1168  */
1169 static void
1170 virtio_dev_stop(struct rte_eth_dev *dev)
1171 {
1172         struct virtio_hw *hw = dev->data->dev_private;
1173
1174         /* reset the NIC */
1175         vtpci_irq_config(hw, 0);
1176         vtpci_reset(hw);
1177         virtio_dev_free_mbufs(dev);
1178 }
1179
1180 static int
1181 virtio_dev_link_update(struct rte_eth_dev *dev, __rte_unused int wait_to_complete)
1182 {
1183         struct rte_eth_link link, old;
1184         uint16_t status;
1185         struct virtio_hw *hw = dev->data->dev_private;
1186         memset(&link, 0, sizeof(link));
1187         virtio_dev_atomic_read_link_status(dev, &link);
1188         old = link;
1189         link.link_duplex = FULL_DUPLEX;
1190         link.link_speed  = SPEED_10G;
1191
1192         if (vtpci_with_feature(hw, VIRTIO_NET_F_STATUS)) {
1193                 PMD_INIT_LOG(DEBUG, "Get link status from hw");
1194                 vtpci_read_dev_config(hw,
1195                                 offsetof(struct virtio_net_config, status),
1196                                 &status, sizeof(status));
1197                 if ((status & VIRTIO_NET_S_LINK_UP) == 0) {
1198                         link.link_status = 0;
1199                         PMD_INIT_LOG(DEBUG, "Port %d is down",
1200                                      dev->data->port_id);
1201                 } else {
1202                         link.link_status = 1;
1203                         PMD_INIT_LOG(DEBUG, "Port %d is up",
1204                                      dev->data->port_id);
1205                 }
1206         } else {
1207                 link.link_status = 1;   /* Link up */
1208         }
1209         virtio_dev_atomic_write_link_status(dev, &link);
1210
1211         return (old.link_status == link.link_status) ? -1 : 0;
1212 }
1213
1214 static void
1215 virtio_dev_info_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
1216 {
1217         struct virtio_hw *hw = dev->data->dev_private;
1218
1219         dev_info->driver_name = dev->driver->pci_drv.name;
1220         dev_info->max_rx_queues = (uint16_t)hw->max_rx_queues;
1221         dev_info->max_tx_queues = (uint16_t)hw->max_tx_queues;
1222         dev_info->min_rx_bufsize = VIRTIO_MIN_RX_BUFSIZE;
1223         dev_info->max_rx_pktlen = VIRTIO_MAX_RX_PKTLEN;
1224         dev_info->max_mac_addrs = VIRTIO_MAX_MAC_ADDRS;
1225 }
1226
1227 /*
1228  * It enables testpmd to collect per queue stats.
1229  */
1230 static int
1231 virtio_dev_queue_stats_mapping_set(__rte_unused struct rte_eth_dev *eth_dev,
1232 __rte_unused uint16_t queue_id, __rte_unused uint8_t stat_idx,
1233 __rte_unused uint8_t is_rx)
1234 {
1235         return 0;
1236 }
1237
1238 static struct rte_driver rte_virtio_driver = {
1239         .type = PMD_PDEV,
1240         .init = rte_virtio_pmd_init,
1241 };
1242
1243 PMD_REGISTER_DRIVER(rte_virtio_driver);