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                 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
 211                 = VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
 212         struct virtio_pmd_ctrl ctrl;
 213         int dlen[1];
 214         int ret;
 215
 216         ctrl.hdr.class = VIRTIO_NET_CTRL_MQ;
 217         ctrl.hdr.cmd = VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET;
 218         memcpy(ctrl.data, &nb_queues, sizeof(uint16_t));
 219
 220         dlen[0] = sizeof(uint16_t);
 221
 222         ret = virtio_send_command(hw->cvq, &ctrl, dlen, 1);
 223
 224         if (ret) {
 225                 PMD_INIT_LOG(ERR, "Multiqueue configured but send command "
 226                           "failed, this is too late now...");
 227                 return -EINVAL;
 228         }
 229
 230         return 0;
 231 }
 232
 233 int virtio_dev_queue_setup(struct rte_eth_dev *dev,
 234                         int queue_type,
 235                         uint16_t queue_idx,
 236                         uint8_t  vtpci_queue_idx,
 237                         uint16_t nb_desc,
 238                         unsigned int socket_id,
 239                         struct virtqueue **pvq)
 240 {
 241         char vq_name[VIRTQUEUE_MAX_NAME_SZ];
 242         const struct rte_memzone *mz;
 243         uint16_t vq_size;
 244         int size;
 245         struct virtio_hw *hw =
 246                 VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
 247         struct virtqueue  *vq = NULL;
 248
 249         /* Write the virtqueue index to the Queue Select Field */
 250         VIRTIO_WRITE_REG_2(hw, VIRTIO_PCI_QUEUE_SEL, vtpci_queue_idx);
 251         PMD_INIT_LOG(DEBUG, "selecting queue: %d", vtpci_queue_idx);
 252
 253         /*
 254          * Read the virtqueue size from the Queue Size field
 255          * Always power of 2 and if 0 virtqueue does not exist
 256          */
 257         vq_size = VIRTIO_READ_REG_2(hw, VIRTIO_PCI_QUEUE_NUM);
 258         PMD_INIT_LOG(DEBUG, "vq_size: %d nb_desc:%d", vq_size, nb_desc);
 259         if (nb_desc == 0)
 260                 nb_desc = vq_size;
 261         if (vq_size == 0) {
 262                 PMD_INIT_LOG(ERR, "%s: virtqueue does not exist", __func__);
 263                 return -EINVAL;
 264         } else if (!rte_is_power_of_2(vq_size)) {
 265                 PMD_INIT_LOG(ERR, "%s: virtqueue size is not powerof 2", __func__);
 266                 return -EINVAL;
 267         } else if (nb_desc != vq_size) {
 268                 PMD_INIT_LOG(ERR, "Warning: nb_desc(%d) is not equal to vq size (%d), fall to vq size",
 269                         nb_desc, vq_size);
 270                 nb_desc = vq_size;
 271         }
 272
 273         if (queue_type == VTNET_RQ) {
 274                 snprintf(vq_name, sizeof(vq_name), "port%d_rvq%d",
 275                         dev->data->port_id, queue_idx);
 276                 vq = rte_zmalloc(vq_name, sizeof(struct virtqueue) +
 277                         vq_size * sizeof(struct vq_desc_extra), RTE_CACHE_LINE_SIZE);
 278         } else if (queue_type == VTNET_TQ) {
 279                 snprintf(vq_name, sizeof(vq_name), "port%d_tvq%d",
 280                         dev->data->port_id, queue_idx);
 281                 vq = rte_zmalloc(vq_name, sizeof(struct virtqueue) +
 282                         vq_size * sizeof(struct vq_desc_extra), RTE_CACHE_LINE_SIZE);
 283         } else if (queue_type == VTNET_CQ) {
 284                 snprintf(vq_name, sizeof(vq_name), "port%d_cvq",
 285                         dev->data->port_id);
 286                 vq = rte_zmalloc(vq_name, sizeof(struct virtqueue) +
 287                         vq_size * sizeof(struct vq_desc_extra),
 288                         RTE_CACHE_LINE_SIZE);
 289         }
 290         if (vq == NULL) {
 291                 PMD_INIT_LOG(ERR, "%s: Can not allocate virtqueue", __func__);
 292                 return (-ENOMEM);
 293         }
 294
 295         vq->hw = hw;
 296         vq->port_id = dev->data->port_id;
 297         vq->queue_id = queue_idx;
 298         vq->vq_queue_index = vtpci_queue_idx;
 299         vq->vq_alignment = VIRTIO_PCI_VRING_ALIGN;
 300         vq->vq_nentries = vq_size;
 301         vq->vq_free_cnt = vq_size;
 302
 303         /*
 304          * Reserve a memzone for vring elements
 305          */
 306         size = vring_size(vq_size, VIRTIO_PCI_VRING_ALIGN);
 307         vq->vq_ring_size = RTE_ALIGN_CEIL(size, VIRTIO_PCI_VRING_ALIGN);
 308         PMD_INIT_LOG(DEBUG, "vring_size: %d, rounded_vring_size: %d", size, vq->vq_ring_size);
 309
 310         mz = rte_memzone_reserve_aligned(vq_name, vq->vq_ring_size,
 311                 socket_id, 0, VIRTIO_PCI_VRING_ALIGN);
 312         if (mz == NULL) {
 313                 rte_free(vq);
 314                 return -ENOMEM;
 315         }
 316
 317         /*
 318          * Virtio PCI device VIRTIO_PCI_QUEUE_PF register is 32bit,
 319          * and only accepts 32 bit page frame number.
 320          * Check if the allocated physical memory exceeds 16TB.
 321          */
 322         if ((mz->phys_addr + vq->vq_ring_size - 1) >> (VIRTIO_PCI_QUEUE_ADDR_SHIFT + 32)) {
 323                 PMD_INIT_LOG(ERR, "vring address shouldn't be above 16TB!");
 324                 rte_free(vq);
 325                 return -ENOMEM;
 326         }
 327
 328         memset(mz->addr, 0, sizeof(mz->len));
 329         vq->mz = mz;
 330         vq->vq_ring_mem = mz->phys_addr;
 331         vq->vq_ring_virt_mem = mz->addr;
 332         PMD_INIT_LOG(DEBUG, "vq->vq_ring_mem:      0x%"PRIx64, (uint64_t)mz->phys_addr);
 333         PMD_INIT_LOG(DEBUG, "vq->vq_ring_virt_mem: 0x%"PRIx64, (uint64_t)mz->addr);
 334         vq->virtio_net_hdr_mz  = NULL;
 335         vq->virtio_net_hdr_mem = 0;
 336
 337         if (queue_type == VTNET_TQ) {
 338                 /*
 339                  * For each xmit packet, allocate a virtio_net_hdr
 340                  */
 341                 snprintf(vq_name, sizeof(vq_name), "port%d_tvq%d_hdrzone",
 342                         dev->data->port_id, queue_idx);
 343                 vq->virtio_net_hdr_mz = rte_memzone_reserve_aligned(vq_name,
 344                         vq_size * hw->vtnet_hdr_size,
 345                         socket_id, 0, RTE_CACHE_LINE_SIZE);
 346                 if (vq->virtio_net_hdr_mz == NULL) {
 347                         rte_free(vq);
 348                         return -ENOMEM;
 349                 }
 350                 vq->virtio_net_hdr_mem =
 351                         vq->virtio_net_hdr_mz->phys_addr;
 352                 memset(vq->virtio_net_hdr_mz->addr, 0,
 353                         vq_size * hw->vtnet_hdr_size);
 354         } else if (queue_type == VTNET_CQ) {
 355                 /* Allocate a page for control vq command, data and status */
 356                 snprintf(vq_name, sizeof(vq_name), "port%d_cvq_hdrzone",
 357                         dev->data->port_id);
 358                 vq->virtio_net_hdr_mz = rte_memzone_reserve_aligned(vq_name,
 359                         PAGE_SIZE, socket_id, 0, RTE_CACHE_LINE_SIZE);
 360                 if (vq->virtio_net_hdr_mz == NULL) {
 361                         rte_free(vq);
 362                         return -ENOMEM;
 363                 }
 364                 vq->virtio_net_hdr_mem =
 365                         vq->virtio_net_hdr_mz->phys_addr;
 366                 memset(vq->virtio_net_hdr_mz->addr, 0, PAGE_SIZE);
 367         }
 368
 369         /*
 370          * Set guest physical address of the virtqueue
 371          * in VIRTIO_PCI_QUEUE_PFN config register of device
 372          */
 373         VIRTIO_WRITE_REG_4(hw, VIRTIO_PCI_QUEUE_PFN,
 374                         mz->phys_addr >> VIRTIO_PCI_QUEUE_ADDR_SHIFT);
 375         *pvq = vq;
 376         return 0;
 377 }
 378
 379 static int
 380 virtio_dev_cq_queue_setup(struct rte_eth_dev *dev, uint16_t vtpci_queue_idx,
 381                 uint32_t socket_id)
 382 {
 383         struct virtqueue *vq;
 384         uint16_t nb_desc = 0;
 385         int ret;
 386         struct virtio_hw *hw =
 387                 VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
 388
 389         PMD_INIT_FUNC_TRACE();
 390         ret = virtio_dev_queue_setup(dev, VTNET_CQ, VTNET_SQ_CQ_QUEUE_IDX,
 391                         vtpci_queue_idx, nb_desc, socket_id, &vq);
 392
 393         if (ret < 0) {
 394                 PMD_INIT_LOG(ERR, "control vq initialization failed");
 395                 return ret;
 396         }
 397
 398         hw->cvq = vq;
 399         return 0;
 400 }
 401
 402 static void
 403 virtio_dev_close(struct rte_eth_dev *dev)
 404 {
 405         PMD_INIT_LOG(DEBUG, "virtio_dev_close");
 406
 407         virtio_dev_stop(dev);
 408 }
 409
 410 static void
 411 virtio_dev_promiscuous_enable(struct rte_eth_dev *dev)
 412 {
 413         struct virtio_hw *hw
 414                 = VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
 415         struct virtio_pmd_ctrl ctrl;
 416         int dlen[1];
 417         int ret;
 418
 419         ctrl.hdr.class = VIRTIO_NET_CTRL_RX;
 420         ctrl.hdr.cmd = VIRTIO_NET_CTRL_RX_PROMISC;
 421         ctrl.data[0] = 1;
 422         dlen[0] = 1;
 423
 424         ret = virtio_send_command(hw->cvq, &ctrl, dlen, 1);
 425
 426         if (ret)
 427                 PMD_INIT_LOG(ERR, "Failed to enable promisc");
 428 }
 429
 430 static void
 431 virtio_dev_promiscuous_disable(struct rte_eth_dev *dev)
 432 {
 433         struct virtio_hw *hw
 434                 = VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
 435         struct virtio_pmd_ctrl ctrl;
 436         int dlen[1];
 437         int ret;
 438
 439         ctrl.hdr.class = VIRTIO_NET_CTRL_RX;
 440         ctrl.hdr.cmd = VIRTIO_NET_CTRL_RX_PROMISC;
 441         ctrl.data[0] = 0;
 442         dlen[0] = 1;
 443
 444         ret = virtio_send_command(hw->cvq, &ctrl, dlen, 1);
 445
 446         if (ret)
 447                 PMD_INIT_LOG(ERR, "Failed to disable promisc");
 448 }
 449
 450 static void
 451 virtio_dev_allmulticast_enable(struct rte_eth_dev *dev)
 452 {
 453         struct virtio_hw *hw
 454                 = VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
 455         struct virtio_pmd_ctrl ctrl;
 456         int dlen[1];
 457         int ret;
 458
 459         ctrl.hdr.class = VIRTIO_NET_CTRL_RX;
 460         ctrl.hdr.cmd = VIRTIO_NET_CTRL_RX_ALLMULTI;
 461         ctrl.data[0] = 1;
 462         dlen[0] = 1;
 463
 464         ret = virtio_send_command(hw->cvq, &ctrl, dlen, 1);
 465
 466         if (ret)
 467                 PMD_INIT_LOG(ERR, "Failed to enable allmulticast");
 468 }
 469
 470 static void
 471 virtio_dev_allmulticast_disable(struct rte_eth_dev *dev)
 472 {
 473         struct virtio_hw *hw
 474                 = VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
 475         struct virtio_pmd_ctrl ctrl;
 476         int dlen[1];
 477         int ret;
 478
 479         ctrl.hdr.class = VIRTIO_NET_CTRL_RX;
 480         ctrl.hdr.cmd = VIRTIO_NET_CTRL_RX_ALLMULTI;
 481         ctrl.data[0] = 0;
 482         dlen[0] = 1;
 483
 484         ret = virtio_send_command(hw->cvq, &ctrl, dlen, 1);
 485
 486         if (ret)
 487                 PMD_INIT_LOG(ERR, "Failed to disable allmulticast");
 488 }
 489
 490 /*
 491  * dev_ops for virtio, bare necessities for basic operation
 492  */
 493 static struct eth_dev_ops virtio_eth_dev_ops = {
 494         .dev_configure           = virtio_dev_configure,
 495         .dev_start               = virtio_dev_start,
 496         .dev_stop                = virtio_dev_stop,
 497         .dev_close               = virtio_dev_close,
 498         .promiscuous_enable      = virtio_dev_promiscuous_enable,
 499         .promiscuous_disable     = virtio_dev_promiscuous_disable,
 500         .allmulticast_enable     = virtio_dev_allmulticast_enable,
 501         .allmulticast_disable    = virtio_dev_allmulticast_disable,
 502
 503         .dev_infos_get           = virtio_dev_info_get,
 504         .stats_get               = virtio_dev_stats_get,
 505         .stats_reset             = virtio_dev_stats_reset,
 506         .link_update             = virtio_dev_link_update,
 507         .mac_addr_add            = NULL,
 508         .mac_addr_remove         = NULL,
 509         .rx_queue_setup          = virtio_dev_rx_queue_setup,
 510         /* meaningfull only to multiple queue */
 511         .rx_queue_release        = virtio_dev_rx_queue_release,
 512         .tx_queue_setup          = virtio_dev_tx_queue_setup,
 513         /* meaningfull only to multiple queue */
 514         .tx_queue_release        = virtio_dev_tx_queue_release,
 515         /* collect stats per queue */
 516         .queue_stats_mapping_set = virtio_dev_queue_stats_mapping_set,
 517 };
 518
 519 static inline int
 520 virtio_dev_atomic_read_link_status(struct rte_eth_dev *dev,
 521                                 struct rte_eth_link *link)
 522 {
 523         struct rte_eth_link *dst = link;
 524         struct rte_eth_link *src = &(dev->data->dev_link);
 525
 526         if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
 527                         *(uint64_t *)src) == 0)
 528                 return -1;
 529
 530         return 0;
 531 }
 532
 533 /**
 534  * Atomically writes the link status information into global
 535  * structure rte_eth_dev.
 536  *
 537  * @param dev
 538  *   - Pointer to the structure rte_eth_dev to read from.
 539  *   - Pointer to the buffer to be saved with the link status.
 540  *
 541  * @return
 542  *   - On success, zero.
 543  *   - On failure, negative value.
 544  */
 545 static inline int
 546 virtio_dev_atomic_write_link_status(struct rte_eth_dev *dev,
 547                 struct rte_eth_link *link)
 548 {
 549         struct rte_eth_link *dst = &(dev->data->dev_link);
 550         struct rte_eth_link *src = link;
 551
 552         if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
 553                                         *(uint64_t *)src) == 0)
 554                 return -1;
 555
 556         return 0;
 557 }
 558
 559 static void
 560 virtio_dev_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *stats)
 561 {
 562         unsigned i;
 563
 564         for (i = 0; i < dev->data->nb_tx_queues; i++) {
 565                 const struct virtqueue *txvq = dev->data->tx_queues[i];
 566                 if (txvq == NULL)
 567                         continue;
 568
 569                 stats->opackets += txvq->packets;
 570                 stats->obytes += txvq->bytes;
 571                 stats->oerrors += txvq->errors;
 572
 573                 if (i < RTE_ETHDEV_QUEUE_STAT_CNTRS) {
 574                         stats->q_opackets[i] = txvq->packets;
 575                         stats->q_obytes[i] = txvq->bytes;
 576                 }
 577         }
 578
 579         for (i = 0; i < dev->data->nb_rx_queues; i++) {
 580                 const struct virtqueue *rxvq = dev->data->rx_queues[i];
 581                 if (rxvq == NULL)
 582                         continue;
 583
 584                 stats->ipackets += rxvq->packets;
 585                 stats->ibytes += rxvq->bytes;
 586                 stats->ierrors += rxvq->errors;
 587
 588                 if (i < RTE_ETHDEV_QUEUE_STAT_CNTRS) {
 589                         stats->q_ipackets[i] = rxvq->packets;
 590                         stats->q_ibytes[i] = rxvq->bytes;
 591                 }
 592         }
 593
 594         stats->rx_nombuf = dev->data->rx_mbuf_alloc_failed;
 595 }
 596
 597 static void
 598 virtio_dev_stats_reset(struct rte_eth_dev *dev)
 599 {
 600         unsigned int i;
 601
 602         for (i = 0; i < dev->data->nb_tx_queues; i++) {
 603                 struct virtqueue *txvq = dev->data->tx_queues[i];
 604                 if (txvq == NULL)
 605                         continue;
 606
 607                 txvq->packets = 0;
 608                 txvq->bytes = 0;
 609                 txvq->errors = 0;
 610         }
 611
 612         for (i = 0; i < dev->data->nb_rx_queues; i++) {
 613                 struct virtqueue *rxvq = dev->data->rx_queues[i];
 614                 if (rxvq == NULL)
 615                         continue;
 616
 617                 rxvq->packets = 0;
 618                 rxvq->bytes = 0;
 619                 rxvq->errors = 0;
 620         }
 621
 622         dev->data->rx_mbuf_alloc_failed = 0;
 623 }
 624
 625 static void
 626 virtio_set_hwaddr(struct virtio_hw *hw)
 627 {
 628         vtpci_write_dev_config(hw,
 629                         offsetof(struct virtio_net_config, mac),
 630                         &hw->mac_addr, ETHER_ADDR_LEN);
 631 }
 632
 633 static void
 634 virtio_get_hwaddr(struct virtio_hw *hw)
 635 {
 636         if (vtpci_with_feature(hw, VIRTIO_NET_F_MAC)) {
 637                 vtpci_read_dev_config(hw,
 638                         offsetof(struct virtio_net_config, mac),
 639                         &hw->mac_addr, ETHER_ADDR_LEN);
 640         } else {
 641                 eth_random_addr(&hw->mac_addr[0]);
 642                 virtio_set_hwaddr(hw);
 643         }
 644 }
 645
 646
 647 static void
 648 virtio_negotiate_features(struct virtio_hw *hw)
 649 {
 650         uint32_t host_features, mask;
 651
 652         mask = VIRTIO_NET_F_CTRL_VLAN;
 653         mask |= VIRTIO_NET_F_CSUM | VIRTIO_NET_F_GUEST_CSUM;
 654
 655         /* TSO and LRO are only available when their corresponding
 656          * checksum offload feature is also negotiated.
 657          */
 658         mask |= VIRTIO_NET_F_HOST_TSO4 | VIRTIO_NET_F_HOST_TSO6 | VIRTIO_NET_F_HOST_ECN;
 659         mask |= VIRTIO_NET_F_GUEST_TSO4 | VIRTIO_NET_F_GUEST_TSO6 | VIRTIO_NET_F_GUEST_ECN;
 660         mask |= VTNET_LRO_FEATURES;
 661
 662         /* not negotiating INDIRECT descriptor table support */
 663         mask |= VIRTIO_RING_F_INDIRECT_DESC;
 664
 665         /* Prepare guest_features: feature that driver wants to support */
 666         hw->guest_features = VTNET_FEATURES & ~mask;
 667         PMD_INIT_LOG(DEBUG, "guest_features before negotiate = %x",
 668                 hw->guest_features);
 669
 670         /* Read device(host) feature bits */
 671         host_features = VIRTIO_READ_REG_4(hw, VIRTIO_PCI_HOST_FEATURES);
 672         PMD_INIT_LOG(DEBUG, "host_features before negotiate = %x",
 673                 host_features);
 674
 675         /*
 676          * Negotiate features: Subset of device feature bits are written back
 677          * guest feature bits.
 678          */
 679         hw->guest_features = vtpci_negotiate_features(hw, host_features);
 680         PMD_INIT_LOG(DEBUG, "features after negotiate = %x",
 681                 hw->guest_features);
 682 }
 683
 684 #ifdef RTE_EXEC_ENV_LINUXAPP
 685 static int
 686 parse_sysfs_value(const char *filename, unsigned long *val)
 687 {
 688         FILE *f;
 689         char buf[BUFSIZ];
 690         char *end = NULL;
 691
 692         f = fopen(filename, "r");
 693         if (f == NULL) {
 694                 PMD_INIT_LOG(ERR, "%s(): cannot open sysfs value %s",
 695                              __func__, filename);
 696                 return -1;
 697         }
 698
 699         if (fgets(buf, sizeof(buf), f) == NULL) {
 700                 PMD_INIT_LOG(ERR, "%s(): cannot read sysfs value %s",
 701                              __func__, filename);
 702                 fclose(f);
 703                 return -1;
 704         }
 705         *val = strtoul(buf, &end, 0);
 706         if ((buf[0] == '\0') || (end == NULL) || (*end != '\n')) {
 707                 PMD_INIT_LOG(ERR, "%s(): cannot parse sysfs value %s",
 708                              __func__, filename);
 709                 fclose(f);
 710                 return -1;
 711         }
 712         fclose(f);
 713         return 0;
 714 }
 715
 716 static int get_uio_dev(struct rte_pci_addr *loc, char *buf, unsigned int buflen)
 717 {
 718         unsigned int uio_num;
 719         struct dirent *e;
 720         DIR *dir;
 721         char dirname[PATH_MAX];
 722
 723         /* depending on kernel version, uio can be located in uio/uioX
 724          * or uio:uioX */
 725         snprintf(dirname, sizeof(dirname),
 726                      SYSFS_PCI_DEVICES "/" PCI_PRI_FMT "/uio",
 727                      loc->domain, loc->bus, loc->devid, loc->function);
 728         dir = opendir(dirname);
 729         if (dir == NULL) {
 730                 /* retry with the parent directory */
 731                 snprintf(dirname, sizeof(dirname),
 732                              SYSFS_PCI_DEVICES "/" PCI_PRI_FMT,
 733                              loc->domain, loc->bus, loc->devid, loc->function);
 734                 dir = opendir(dirname);
 735
 736                 if (dir == NULL) {
 737                         PMD_INIT_LOG(ERR, "Cannot opendir %s", dirname);
 738                         return -1;
 739                 }
 740         }
 741
 742         /* take the first file starting with "uio" */
 743         while ((e = readdir(dir)) != NULL) {
 744                 /* format could be uio%d ...*/
 745                 int shortprefix_len = sizeof("uio") - 1;
 746                 /* ... or uio:uio%d */
 747                 int longprefix_len = sizeof("uio:uio") - 1;
 748                 char *endptr;
 749
 750                 if (strncmp(e->d_name, "uio", 3) != 0)
 751                         continue;
 752
 753                 /* first try uio%d */
 754                 errno = 0;
 755                 uio_num = strtoull(e->d_name + shortprefix_len, &endptr, 10);
 756                 if (errno == 0 && endptr != (e->d_name + shortprefix_len)) {
 757                         snprintf(buf, buflen, "%s/uio%u", dirname, uio_num);
 758                         break;
 759                 }
 760
 761                 /* then try uio:uio%d */
 762                 errno = 0;
 763                 uio_num = strtoull(e->d_name + longprefix_len, &endptr, 10);
 764                 if (errno == 0 && endptr != (e->d_name + longprefix_len)) {
 765                         snprintf(buf, buflen, "%s/uio:uio%u", dirname,
 766                                      uio_num);
 767                         break;
 768                 }
 769         }
 770         closedir(dir);
 771
 772         /* No uio resource found */
 773         if (e == NULL) {
 774                 PMD_INIT_LOG(ERR, "Could not find uio resource");
 775                 return -1;
 776         }
 777
 778         return 0;
 779 }
 780
 781 static int
 782 virtio_has_msix(const struct rte_pci_addr *loc)
 783 {
 784         DIR *d;
 785         char dirname[PATH_MAX];
 786
 787         snprintf(dirname, sizeof(dirname),
 788                      SYSFS_PCI_DEVICES "/" PCI_PRI_FMT "/msi_irqs",
 789                      loc->domain, loc->bus, loc->devid, loc->function);
 790
 791         d = opendir(dirname);
 792         if (d)
 793                 closedir(d);
 794
 795         return (d != NULL);
 796 }
 797 #else
 798 static int
 799 virtio_has_msix(const struct rte_pci_addr *loc __rte_unused)
 800 {
 801         /* nic_uio does not enable interrupts, return 0 (false). */
 802         return 0;
 803 }
 804 #endif
 805
 806 /*
 807  * This function is based on probe() function in virtio_pci.c
 808  * It returns 0 on success.
 809  */
 810 static int
 811 eth_virtio_dev_init(__rte_unused struct eth_driver *eth_drv,
 812                 struct rte_eth_dev *eth_dev)
 813 {
 814         struct virtio_net_config *config;
 815         struct virtio_net_config local_config;
 816         uint32_t offset_conf = sizeof(config->mac);
 817         struct rte_pci_device *pci_dev;
 818         struct virtio_hw *hw =
 819                 VIRTIO_DEV_PRIVATE_TO_HW(eth_dev->data->dev_private);
 820
 821         if (RTE_PKTMBUF_HEADROOM < sizeof(struct virtio_net_hdr)) {
 822                 PMD_INIT_LOG(ERR,
 823                         "MBUF HEADROOM should be enough to hold virtio net hdr\n");
 824                 return -1;
 825         }
 826
 827         eth_dev->dev_ops = &virtio_eth_dev_ops;
 828         eth_dev->tx_pkt_burst = &virtio_xmit_pkts;
 829
 830         if (rte_eal_process_type() == RTE_PROC_SECONDARY)
 831                 return 0;
 832
 833         pci_dev = eth_dev->pci_dev;
 834
 835 #ifdef RTE_EXEC_ENV_LINUXAPP
 836         {
 837                 char dirname[PATH_MAX];
 838                 char filename[PATH_MAX];
 839                 unsigned long start, size;
 840
 841                 if (get_uio_dev(&pci_dev->addr, dirname, sizeof(dirname)) < 0)
 842                         return -1;
 843
 844                 /* get portio size */
 845                 snprintf(filename, sizeof(filename),
 846                              "%s/portio/port0/size", dirname);
 847                 if (parse_sysfs_value(filename, &size) < 0) {
 848                         PMD_INIT_LOG(ERR, "%s(): cannot parse size",
 849                                      __func__);
 850                         return -1;
 851                 }
 852
 853                 /* get portio start */
 854                 snprintf(filename, sizeof(filename),
 855                              "%s/portio/port0/start", dirname);
 856                 if (parse_sysfs_value(filename, &start) < 0) {
 857                         PMD_INIT_LOG(ERR, "%s(): cannot parse portio start",
 858                                      __func__);
 859                         return -1;
 860                 }
 861                 pci_dev->mem_resource[0].addr = (void *)(uintptr_t)start;
 862                 pci_dev->mem_resource[0].len =  (uint64_t)size;
 863                 PMD_INIT_LOG(DEBUG,
 864                              "PCI Port IO found start=0x%lx with size=0x%lx",
 865                              start, size);
 866         }
 867 #endif
 868         hw->use_msix = virtio_has_msix(&pci_dev->addr);
 869         hw->io_base = (uint32_t)(uintptr_t)pci_dev->mem_resource[0].addr;
 870
 871         /* Reset the device although not necessary at startup */
 872         vtpci_reset(hw);
 873
 874         /* Tell the host we've noticed this device. */
 875         vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_ACK);
 876
 877         /* Tell the host we've known how to drive the device. */
 878         vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_DRIVER);
 879         virtio_negotiate_features(hw);
 880
 881         /* Setting up rx_header size for the device */
 882         if (vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) {
 883                 eth_dev->rx_pkt_burst = &virtio_recv_mergeable_pkts;
 884                 hw->vtnet_hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf);
 885         } else {
 886                 eth_dev->rx_pkt_burst = &virtio_recv_pkts;
 887                 hw->vtnet_hdr_size = sizeof(struct virtio_net_hdr);
 888         }
 889
 890         /* Allocate memory for storing MAC addresses */
 891         eth_dev->data->mac_addrs = rte_zmalloc("virtio", ETHER_ADDR_LEN, 0);
 892         if (eth_dev->data->mac_addrs == NULL) {
 893                 PMD_INIT_LOG(ERR,
 894                         "Failed to allocate %d bytes needed to store MAC addresses",
 895                         ETHER_ADDR_LEN);
 896                 return -ENOMEM;
 897         }
 898
 899         /* Copy the permanent MAC address to: virtio_hw */
 900         virtio_get_hwaddr(hw);
 901         ether_addr_copy((struct ether_addr *) hw->mac_addr,
 902                         &eth_dev->data->mac_addrs[0]);
 903         PMD_INIT_LOG(DEBUG,
 904                      "PORT MAC: %02X:%02X:%02X:%02X:%02X:%02X",
 905                      hw->mac_addr[0], hw->mac_addr[1], hw->mac_addr[2],
 906                      hw->mac_addr[3], hw->mac_addr[4], hw->mac_addr[5]);
 907
 908         if (vtpci_with_feature(hw, VIRTIO_NET_F_CTRL_VQ)) {
 909                 config = &local_config;
 910
 911                 if (vtpci_with_feature(hw, VIRTIO_NET_F_STATUS)) {
 912                         offset_conf += sizeof(config->status);
 913                 } else {
 914                         PMD_INIT_LOG(DEBUG,
 915                                      "VIRTIO_NET_F_STATUS is not supported");
 916                         config->status = 0;
 917                 }
 918
 919                 if (vtpci_with_feature(hw, VIRTIO_NET_F_MQ)) {
 920                         offset_conf += sizeof(config->max_virtqueue_pairs);
 921                 } else {
 922                         PMD_INIT_LOG(DEBUG,
 923                                      "VIRTIO_NET_F_MQ is not supported");
 924                         config->max_virtqueue_pairs = 1;
 925                 }
 926
 927                 vtpci_read_dev_config(hw, 0, (uint8_t *)config, offset_conf);
 928
 929                 hw->max_rx_queues =
 930                         (VIRTIO_MAX_RX_QUEUES < config->max_virtqueue_pairs) ?
 931                         VIRTIO_MAX_RX_QUEUES : config->max_virtqueue_pairs;
 932                 hw->max_tx_queues =
 933                         (VIRTIO_MAX_TX_QUEUES < config->max_virtqueue_pairs) ?
 934                         VIRTIO_MAX_TX_QUEUES : config->max_virtqueue_pairs;
 935
 936                 virtio_dev_cq_queue_setup(eth_dev,
 937                                         config->max_virtqueue_pairs * 2,
 938                                         SOCKET_ID_ANY);
 939
 940                 PMD_INIT_LOG(DEBUG, "config->max_virtqueue_pairs=%d",
 941                                 config->max_virtqueue_pairs);
 942                 PMD_INIT_LOG(DEBUG, "config->status=%d", config->status);
 943                 PMD_INIT_LOG(DEBUG,
 944                                 "PORT MAC: %02X:%02X:%02X:%02X:%02X:%02X",
 945                                 config->mac[0], config->mac[1],
 946                                 config->mac[2], config->mac[3],
 947                                 config->mac[4], config->mac[5]);
 948         } else {
 949                 hw->max_rx_queues = 1;
 950                 hw->max_tx_queues = 1;
 951         }
 952
 953         eth_dev->data->nb_rx_queues = hw->max_rx_queues;
 954         eth_dev->data->nb_tx_queues = hw->max_tx_queues;
 955
 956         PMD_INIT_LOG(DEBUG, "hw->max_rx_queues=%d   hw->max_tx_queues=%d",
 957                         hw->max_rx_queues, hw->max_tx_queues);
 958         PMD_INIT_LOG(DEBUG, "port %d vendorID=0x%x deviceID=0x%x",
 959                         eth_dev->data->port_id, pci_dev->id.vendor_id,
 960                         pci_dev->id.device_id);
 961         return 0;
 962 }
 963
 964 static struct eth_driver rte_virtio_pmd = {
 965         {
 966                 .name = "rte_virtio_pmd",
 967                 .id_table = pci_id_virtio_map,
 968                 .drv_flags = RTE_PCI_DRV_NEED_MAPPING,
 969         },
 970         .eth_dev_init = eth_virtio_dev_init,
 971         .dev_private_size = sizeof(struct virtio_adapter),
 972 };
 973
 974 /*
 975  * Driver initialization routine.
 976  * Invoked once at EAL init time.
 977  * Register itself as the [Poll Mode] Driver of PCI virtio devices.
 978  * Returns 0 on success.
 979  */
 980 static int
 981 rte_virtio_pmd_init(const char *name __rte_unused,
 982                     const char *param __rte_unused)
 983 {
 984         if (rte_eal_iopl_init() != 0) {
 985                 PMD_INIT_LOG(ERR, "IOPL call failed - cannot use virtio PMD");
 986                 return -1;
 987         }
 988
 989         rte_eth_driver_register(&rte_virtio_pmd);
 990         return 0;
 991 }
 992
 993 /*
 994  * Only 1 queue is supported, no queue release related operation
 995  */
 996 static void
 997 virtio_dev_rx_queue_release(__rte_unused void *rxq)
 998 {
 999 }
1000
1001 static void
1002 virtio_dev_tx_queue_release(__rte_unused void *txq)
1003 {
1004 }
1005
1006 /*
1007  * Configure virtio device
1008  * It returns 0 on success.
1009  */
1010 static int
1011 virtio_dev_configure(struct rte_eth_dev *dev)
1012 {
1013         const struct rte_eth_rxmode *rxmode = &dev->data->dev_conf.rxmode;
1014
1015         PMD_INIT_LOG(DEBUG, "configure");
1016
1017         if (rxmode->hw_ip_checksum) {
1018                 PMD_DRV_LOG(ERR, "HW IP checksum not supported");
1019                 return (-EINVAL);
1020         }
1021
1022         return 0;
1023 }
1024
1025
1026 static int
1027 virtio_dev_start(struct rte_eth_dev *dev)
1028 {
1029         uint16_t nb_queues, i;
1030         uint16_t status;
1031         struct virtio_hw *hw =
1032                 VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
1033
1034         /* Tell the host we've noticed this device. */
1035         vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_ACK);
1036
1037         /* Tell the host we've known how to drive the device. */
1038         vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_DRIVER);
1039
1040         virtio_dev_cq_start(dev);
1041
1042         /* Do final configuration before rx/tx engine starts */
1043         virtio_dev_rxtx_start(dev);
1044
1045         /* Check VIRTIO_NET_F_STATUS for link status*/
1046         if (vtpci_with_feature(hw, VIRTIO_NET_F_STATUS)) {
1047                 vtpci_read_dev_config(hw,
1048                                 offsetof(struct virtio_net_config, status),
1049                                 &status, sizeof(status));
1050                 if ((status & VIRTIO_NET_S_LINK_UP) == 0) {
1051                         PMD_INIT_LOG(ERR, "Port: %d Link is DOWN",
1052                                      dev->data->port_id);
1053                         return -EIO;
1054                 } else {
1055                         PMD_INIT_LOG(DEBUG, "Port: %d Link is UP",
1056                                      dev->data->port_id);
1057                 }
1058         }
1059         vtpci_reinit_complete(hw);
1060
1061         /*Notify the backend
1062          *Otherwise the tap backend might already stop its queue due to fullness.
1063          *vhost backend will have no chance to be waked up
1064          */
1065         nb_queues = dev->data->nb_rx_queues;
1066         if (nb_queues > 1) {
1067                 if (virtio_set_multiple_queues(dev, nb_queues) != 0)
1068                         return -EINVAL;
1069         }
1070
1071         PMD_INIT_LOG(DEBUG, "nb_queues=%d", nb_queues);
1072
1073         for (i = 0; i < nb_queues; i++)
1074                 virtqueue_notify(dev->data->rx_queues[i]);
1075
1076         PMD_INIT_LOG(DEBUG, "Notified backend at initialization");
1077
1078         for (i = 0; i < dev->data->nb_rx_queues; i++)
1079                 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->rx_queues[i]);
1080
1081         for (i = 0; i < dev->data->nb_tx_queues; i++)
1082                 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->tx_queues[i]);
1083
1084         return 0;
1085 }
1086
1087 static void virtio_dev_free_mbufs(struct rte_eth_dev *dev)
1088 {
1089         struct rte_mbuf *buf;
1090         int i, mbuf_num = 0;
1091
1092         for (i = 0; i < dev->data->nb_rx_queues; i++) {
1093                 PMD_INIT_LOG(DEBUG,
1094                              "Before freeing rxq[%d] used and unused buf", i);
1095                 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->rx_queues[i]);
1096
1097                 while ((buf = (struct rte_mbuf *)virtqueue_detatch_unused(
1098                                         dev->data->rx_queues[i])) != NULL) {
1099                         rte_pktmbuf_free(buf);
1100                         mbuf_num++;
1101                 }
1102
1103                 PMD_INIT_LOG(DEBUG, "free %d mbufs", mbuf_num);
1104                 PMD_INIT_LOG(DEBUG,
1105                              "After freeing rxq[%d] used and unused buf", i);
1106                 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->rx_queues[i]);
1107         }
1108
1109         for (i = 0; i < dev->data->nb_tx_queues; i++) {
1110                 PMD_INIT_LOG(DEBUG,
1111                              "Before freeing txq[%d] used and unused bufs",
1112                              i);
1113                 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->tx_queues[i]);
1114
1115                 mbuf_num = 0;
1116                 while ((buf = (struct rte_mbuf *)virtqueue_detatch_unused(
1117                                         dev->data->tx_queues[i])) != NULL) {
1118                         rte_pktmbuf_free(buf);
1119
1120                         mbuf_num++;
1121                 }
1122
1123                 PMD_INIT_LOG(DEBUG, "free %d mbufs", mbuf_num);
1124                 PMD_INIT_LOG(DEBUG,
1125                              "After freeing txq[%d] used and unused buf", i);
1126                 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->tx_queues[i]);
1127         }
1128 }
1129
1130 /*
1131  * Stop device: disable rx and tx functions to allow for reconfiguring.
1132  */
1133 static void
1134 virtio_dev_stop(struct rte_eth_dev *dev)
1135 {
1136         struct virtio_hw *hw =
1137                 VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
1138
1139         /* reset the NIC */
1140         vtpci_reset(hw);
1141         virtio_dev_free_mbufs(dev);
1142 }
1143
1144 static int
1145 virtio_dev_link_update(struct rte_eth_dev *dev, __rte_unused int wait_to_complete)
1146 {
1147         struct rte_eth_link link, old;
1148         uint16_t status;
1149         struct virtio_hw *hw =
1150                 VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
1151         memset(&link, 0, sizeof(link));
1152         virtio_dev_atomic_read_link_status(dev, &link);
1153         old = link;
1154         link.link_duplex = FULL_DUPLEX;
1155         link.link_speed  = SPEED_10G;
1156         if (vtpci_with_feature(hw, VIRTIO_NET_F_STATUS)) {
1157                 PMD_INIT_LOG(DEBUG, "Get link status from hw");
1158                 vtpci_read_dev_config(hw,
1159                                 offsetof(struct virtio_net_config, status),
1160                                 &status, sizeof(status));
1161                 if ((status & VIRTIO_NET_S_LINK_UP) == 0) {
1162                         link.link_status = 0;
1163                         PMD_INIT_LOG(DEBUG, "Port %d is down",
1164                                      dev->data->port_id);
1165                 } else {
1166                         link.link_status = 1;
1167                         PMD_INIT_LOG(DEBUG, "Port %d is up",
1168                                      dev->data->port_id);
1169                 }
1170         } else {
1171                 link.link_status = 1;   /* Link up */
1172         }
1173         virtio_dev_atomic_write_link_status(dev, &link);
1174         if (old.link_status == link.link_status)
1175                 return -1;
1176         /*changed*/
1177         return 0;
1178 }
1179
1180 static void
1181 virtio_dev_info_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
1182 {
1183         struct virtio_hw *hw = VIRTIO_DEV_PRIVATE_TO_HW(dev->data->dev_private);
1184
1185         dev_info->driver_name = dev->driver->pci_drv.name;
1186         dev_info->max_rx_queues = (uint16_t)hw->max_rx_queues;
1187         dev_info->max_tx_queues = (uint16_t)hw->max_tx_queues;
1188         dev_info->min_rx_bufsize = VIRTIO_MIN_RX_BUFSIZE;
1189         dev_info->max_rx_pktlen = VIRTIO_MAX_RX_PKTLEN;
1190         dev_info->max_mac_addrs = VIRTIO_MAX_MAC_ADDRS;
1191 }
1192
1193 /*
1194  * It enables testpmd to collect per queue stats.
1195  */
1196 static int
1197 virtio_dev_queue_stats_mapping_set(__rte_unused struct rte_eth_dev *eth_dev,
1198 __rte_unused uint16_t queue_id, __rte_unused uint8_t stat_idx,
1199 __rte_unused uint8_t is_rx)
1200 {
1201         return 0;
1202 }
1203
1204 static struct rte_driver rte_virtio_driver = {
1205         .type = PMD_PDEV,
1206         .init = rte_virtio_pmd_init,
1207 };
1208
1209 PMD_REGISTER_DRIVER(rte_virtio_driver);