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_alignment = VIRTIO_PCI_VRING_ALIGN;
 298         vq->vq_nentries = vq_size;
 299         vq->vq_free_cnt = vq_size;
 300
 301         /*
 302          * Reserve a memzone for vring elements
 303          */
 304         size = vring_size(vq_size, VIRTIO_PCI_VRING_ALIGN);
 305         vq->vq_ring_size = RTE_ALIGN_CEIL(size, VIRTIO_PCI_VRING_ALIGN);
 306         PMD_INIT_LOG(DEBUG, "vring_size: %d, rounded_vring_size: %d", size, vq->vq_ring_size);
 307
 308         mz = rte_memzone_reserve_aligned(vq_name, vq->vq_ring_size,
 309                 socket_id, 0, VIRTIO_PCI_VRING_ALIGN);
 310         if (mz == NULL) {
 311                 rte_free(vq);
 312                 return -ENOMEM;
 313         }
 314
 315         /*
 316          * Virtio PCI device VIRTIO_PCI_QUEUE_PF register is 32bit,
 317          * and only accepts 32 bit page frame number.
 318          * Check if the allocated physical memory exceeds 16TB.
 319          */
 320         if ((mz->phys_addr + vq->vq_ring_size - 1) >> (VIRTIO_PCI_QUEUE_ADDR_SHIFT + 32)) {
 321                 PMD_INIT_LOG(ERR, "vring address shouldn't be above 16TB!");
 322                 rte_free(vq);
 323                 return -ENOMEM;
 324         }
 325
 326         memset(mz->addr, 0, sizeof(mz->len));
 327         vq->mz = mz;
 328         vq->vq_ring_mem = mz->phys_addr;
 329         vq->vq_ring_virt_mem = mz->addr;
 330         PMD_INIT_LOG(DEBUG, "vq->vq_ring_mem:      0x%"PRIx64, (uint64_t)mz->phys_addr);
 331         PMD_INIT_LOG(DEBUG, "vq->vq_ring_virt_mem: 0x%"PRIx64, (uint64_t)mz->addr);
 332         vq->virtio_net_hdr_mz  = NULL;
 333         vq->virtio_net_hdr_mem = 0;
 334
 335         if (queue_type == VTNET_TQ) {
 336                 /*
 337                  * For each xmit packet, allocate a virtio_net_hdr
 338                  */
 339                 snprintf(vq_name, sizeof(vq_name), "port%d_tvq%d_hdrzone",
 340                         dev->data->port_id, queue_idx);
 341                 vq->virtio_net_hdr_mz = rte_memzone_reserve_aligned(vq_name,
 342                         vq_size * hw->vtnet_hdr_size,
 343                         socket_id, 0, RTE_CACHE_LINE_SIZE);
 344                 if (vq->virtio_net_hdr_mz == NULL) {
 345                         rte_free(vq);
 346                         return -ENOMEM;
 347                 }
 348                 vq->virtio_net_hdr_mem =
 349                         vq->virtio_net_hdr_mz->phys_addr;
 350                 memset(vq->virtio_net_hdr_mz->addr, 0,
 351                         vq_size * hw->vtnet_hdr_size);
 352         } else if (queue_type == VTNET_CQ) {
 353                 /* Allocate a page for control vq command, data and status */
 354                 snprintf(vq_name, sizeof(vq_name), "port%d_cvq_hdrzone",
 355                         dev->data->port_id);
 356                 vq->virtio_net_hdr_mz = rte_memzone_reserve_aligned(vq_name,
 357                         PAGE_SIZE, socket_id, 0, RTE_CACHE_LINE_SIZE);
 358                 if (vq->virtio_net_hdr_mz == NULL) {
 359                         rte_free(vq);
 360                         return -ENOMEM;
 361                 }
 362                 vq->virtio_net_hdr_mem =
 363                         vq->virtio_net_hdr_mz->phys_addr;
 364                 memset(vq->virtio_net_hdr_mz->addr, 0, PAGE_SIZE);
 365         }
 366
 367         /*
 368          * Set guest physical address of the virtqueue
 369          * in VIRTIO_PCI_QUEUE_PFN config register of device
 370          */
 371         VIRTIO_WRITE_REG_4(hw, VIRTIO_PCI_QUEUE_PFN,
 372                         mz->phys_addr >> VIRTIO_PCI_QUEUE_ADDR_SHIFT);
 373         *pvq = vq;
 374         return 0;
 375 }
 376
 377 static int
 378 virtio_dev_cq_queue_setup(struct rte_eth_dev *dev, uint16_t vtpci_queue_idx,
 379                 uint32_t socket_id)
 380 {
 381         struct virtqueue *vq;
 382         uint16_t nb_desc = 0;
 383         int ret;
 384         struct virtio_hw *hw = dev->data->dev_private;
 385
 386         PMD_INIT_FUNC_TRACE();
 387         ret = virtio_dev_queue_setup(dev, VTNET_CQ, VTNET_SQ_CQ_QUEUE_IDX,
 388                         vtpci_queue_idx, nb_desc, socket_id, &vq);
 389
 390         if (ret < 0) {
 391                 PMD_INIT_LOG(ERR, "control vq initialization failed");
 392                 return ret;
 393         }
 394
 395         hw->cvq = vq;
 396         return 0;
 397 }
 398
 399 static void
 400 virtio_dev_close(struct rte_eth_dev *dev)
 401 {
 402         PMD_INIT_LOG(DEBUG, "virtio_dev_close");
 403
 404         virtio_dev_stop(dev);
 405 }
 406
 407 static void
 408 virtio_dev_promiscuous_enable(struct rte_eth_dev *dev)
 409 {
 410         struct virtio_hw *hw = dev->data->dev_private;
 411         struct virtio_pmd_ctrl ctrl;
 412         int dlen[1];
 413         int ret;
 414
 415         ctrl.hdr.class = VIRTIO_NET_CTRL_RX;
 416         ctrl.hdr.cmd = VIRTIO_NET_CTRL_RX_PROMISC;
 417         ctrl.data[0] = 1;
 418         dlen[0] = 1;
 419
 420         ret = virtio_send_command(hw->cvq, &ctrl, dlen, 1);
 421
 422         if (ret)
 423                 PMD_INIT_LOG(ERR, "Failed to enable promisc");
 424 }
 425
 426 static void
 427 virtio_dev_promiscuous_disable(struct rte_eth_dev *dev)
 428 {
 429         struct virtio_hw *hw = dev->data->dev_private;
 430         struct virtio_pmd_ctrl ctrl;
 431         int dlen[1];
 432         int ret;
 433
 434         ctrl.hdr.class = VIRTIO_NET_CTRL_RX;
 435         ctrl.hdr.cmd = VIRTIO_NET_CTRL_RX_PROMISC;
 436         ctrl.data[0] = 0;
 437         dlen[0] = 1;
 438
 439         ret = virtio_send_command(hw->cvq, &ctrl, dlen, 1);
 440
 441         if (ret)
 442                 PMD_INIT_LOG(ERR, "Failed to disable promisc");
 443 }
 444
 445 static void
 446 virtio_dev_allmulticast_enable(struct rte_eth_dev *dev)
 447 {
 448         struct virtio_hw *hw = dev->data->dev_private;
 449         struct virtio_pmd_ctrl ctrl;
 450         int dlen[1];
 451         int ret;
 452
 453         ctrl.hdr.class = VIRTIO_NET_CTRL_RX;
 454         ctrl.hdr.cmd = VIRTIO_NET_CTRL_RX_ALLMULTI;
 455         ctrl.data[0] = 1;
 456         dlen[0] = 1;
 457
 458         ret = virtio_send_command(hw->cvq, &ctrl, dlen, 1);
 459
 460         if (ret)
 461                 PMD_INIT_LOG(ERR, "Failed to enable allmulticast");
 462 }
 463
 464 static void
 465 virtio_dev_allmulticast_disable(struct rte_eth_dev *dev)
 466 {
 467         struct virtio_hw *hw = dev->data->dev_private;
 468         struct virtio_pmd_ctrl ctrl;
 469         int dlen[1];
 470         int ret;
 471
 472         ctrl.hdr.class = VIRTIO_NET_CTRL_RX;
 473         ctrl.hdr.cmd = VIRTIO_NET_CTRL_RX_ALLMULTI;
 474         ctrl.data[0] = 0;
 475         dlen[0] = 1;
 476
 477         ret = virtio_send_command(hw->cvq, &ctrl, dlen, 1);
 478
 479         if (ret)
 480                 PMD_INIT_LOG(ERR, "Failed to disable allmulticast");
 481 }
 482
 483 /*
 484  * dev_ops for virtio, bare necessities for basic operation
 485  */
 486 static struct eth_dev_ops virtio_eth_dev_ops = {
 487         .dev_configure           = virtio_dev_configure,
 488         .dev_start               = virtio_dev_start,
 489         .dev_stop                = virtio_dev_stop,
 490         .dev_close               = virtio_dev_close,
 491         .promiscuous_enable      = virtio_dev_promiscuous_enable,
 492         .promiscuous_disable     = virtio_dev_promiscuous_disable,
 493         .allmulticast_enable     = virtio_dev_allmulticast_enable,
 494         .allmulticast_disable    = virtio_dev_allmulticast_disable,
 495
 496         .dev_infos_get           = virtio_dev_info_get,
 497         .stats_get               = virtio_dev_stats_get,
 498         .stats_reset             = virtio_dev_stats_reset,
 499         .link_update             = virtio_dev_link_update,
 500         .mac_addr_add            = NULL,
 501         .mac_addr_remove         = NULL,
 502         .rx_queue_setup          = virtio_dev_rx_queue_setup,
 503         /* meaningfull only to multiple queue */
 504         .rx_queue_release        = virtio_dev_rx_queue_release,
 505         .tx_queue_setup          = virtio_dev_tx_queue_setup,
 506         /* meaningfull only to multiple queue */
 507         .tx_queue_release        = virtio_dev_tx_queue_release,
 508         /* collect stats per queue */
 509         .queue_stats_mapping_set = virtio_dev_queue_stats_mapping_set,
 510 };
 511
 512 static inline int
 513 virtio_dev_atomic_read_link_status(struct rte_eth_dev *dev,
 514                                 struct rte_eth_link *link)
 515 {
 516         struct rte_eth_link *dst = link;
 517         struct rte_eth_link *src = &(dev->data->dev_link);
 518
 519         if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
 520                         *(uint64_t *)src) == 0)
 521                 return -1;
 522
 523         return 0;
 524 }
 525
 526 /**
 527  * Atomically writes the link status information into global
 528  * structure rte_eth_dev.
 529  *
 530  * @param dev
 531  *   - Pointer to the structure rte_eth_dev to read from.
 532  *   - Pointer to the buffer to be saved with the link status.
 533  *
 534  * @return
 535  *   - On success, zero.
 536  *   - On failure, negative value.
 537  */
 538 static inline int
 539 virtio_dev_atomic_write_link_status(struct rte_eth_dev *dev,
 540                 struct rte_eth_link *link)
 541 {
 542         struct rte_eth_link *dst = &(dev->data->dev_link);
 543         struct rte_eth_link *src = link;
 544
 545         if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
 546                                         *(uint64_t *)src) == 0)
 547                 return -1;
 548
 549         return 0;
 550 }
 551
 552 static void
 553 virtio_dev_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *stats)
 554 {
 555         unsigned i;
 556
 557         for (i = 0; i < dev->data->nb_tx_queues; i++) {
 558                 const struct virtqueue *txvq = dev->data->tx_queues[i];
 559                 if (txvq == NULL)
 560                         continue;
 561
 562                 stats->opackets += txvq->packets;
 563                 stats->obytes += txvq->bytes;
 564                 stats->oerrors += txvq->errors;
 565
 566                 if (i < RTE_ETHDEV_QUEUE_STAT_CNTRS) {
 567                         stats->q_opackets[i] = txvq->packets;
 568                         stats->q_obytes[i] = txvq->bytes;
 569                 }
 570         }
 571
 572         for (i = 0; i < dev->data->nb_rx_queues; i++) {
 573                 const struct virtqueue *rxvq = dev->data->rx_queues[i];
 574                 if (rxvq == NULL)
 575                         continue;
 576
 577                 stats->ipackets += rxvq->packets;
 578                 stats->ibytes += rxvq->bytes;
 579                 stats->ierrors += rxvq->errors;
 580
 581                 if (i < RTE_ETHDEV_QUEUE_STAT_CNTRS) {
 582                         stats->q_ipackets[i] = rxvq->packets;
 583                         stats->q_ibytes[i] = rxvq->bytes;
 584                 }
 585         }
 586
 587         stats->rx_nombuf = dev->data->rx_mbuf_alloc_failed;
 588 }
 589
 590 static void
 591 virtio_dev_stats_reset(struct rte_eth_dev *dev)
 592 {
 593         unsigned int i;
 594
 595         for (i = 0; i < dev->data->nb_tx_queues; i++) {
 596                 struct virtqueue *txvq = dev->data->tx_queues[i];
 597                 if (txvq == NULL)
 598                         continue;
 599
 600                 txvq->packets = 0;
 601                 txvq->bytes = 0;
 602                 txvq->errors = 0;
 603         }
 604
 605         for (i = 0; i < dev->data->nb_rx_queues; i++) {
 606                 struct virtqueue *rxvq = dev->data->rx_queues[i];
 607                 if (rxvq == NULL)
 608                         continue;
 609
 610                 rxvq->packets = 0;
 611                 rxvq->bytes = 0;
 612                 rxvq->errors = 0;
 613         }
 614
 615         dev->data->rx_mbuf_alloc_failed = 0;
 616 }
 617
 618 static void
 619 virtio_set_hwaddr(struct virtio_hw *hw)
 620 {
 621         vtpci_write_dev_config(hw,
 622                         offsetof(struct virtio_net_config, mac),
 623                         &hw->mac_addr, ETHER_ADDR_LEN);
 624 }
 625
 626 static void
 627 virtio_get_hwaddr(struct virtio_hw *hw)
 628 {
 629         if (vtpci_with_feature(hw, VIRTIO_NET_F_MAC)) {
 630                 vtpci_read_dev_config(hw,
 631                         offsetof(struct virtio_net_config, mac),
 632                         &hw->mac_addr, ETHER_ADDR_LEN);
 633         } else {
 634                 eth_random_addr(&hw->mac_addr[0]);
 635                 virtio_set_hwaddr(hw);
 636         }
 637 }
 638
 639
 640 static void
 641 virtio_negotiate_features(struct virtio_hw *hw)
 642 {
 643         uint32_t host_features, mask;
 644
 645         mask = VIRTIO_NET_F_CTRL_VLAN;
 646         mask |= VIRTIO_NET_F_CSUM | VIRTIO_NET_F_GUEST_CSUM;
 647
 648         /* TSO and LRO are only available when their corresponding
 649          * checksum offload feature is also negotiated.
 650          */
 651         mask |= VIRTIO_NET_F_HOST_TSO4 | VIRTIO_NET_F_HOST_TSO6 | VIRTIO_NET_F_HOST_ECN;
 652         mask |= VIRTIO_NET_F_GUEST_TSO4 | VIRTIO_NET_F_GUEST_TSO6 | VIRTIO_NET_F_GUEST_ECN;
 653         mask |= VTNET_LRO_FEATURES;
 654
 655         /* not negotiating INDIRECT descriptor table support */
 656         mask |= VIRTIO_RING_F_INDIRECT_DESC;
 657
 658         /* Prepare guest_features: feature that driver wants to support */
 659         hw->guest_features = VTNET_FEATURES & ~mask;
 660         PMD_INIT_LOG(DEBUG, "guest_features before negotiate = %x",
 661                 hw->guest_features);
 662
 663         /* Read device(host) feature bits */
 664         host_features = VIRTIO_READ_REG_4(hw, VIRTIO_PCI_HOST_FEATURES);
 665         PMD_INIT_LOG(DEBUG, "host_features before negotiate = %x",
 666                 host_features);
 667
 668         /*
 669          * Negotiate features: Subset of device feature bits are written back
 670          * guest feature bits.
 671          */
 672         hw->guest_features = vtpci_negotiate_features(hw, host_features);
 673         PMD_INIT_LOG(DEBUG, "features after negotiate = %x",
 674                 hw->guest_features);
 675 }
 676
 677 #ifdef RTE_EXEC_ENV_LINUXAPP
 678 static int
 679 parse_sysfs_value(const char *filename, unsigned long *val)
 680 {
 681         FILE *f;
 682         char buf[BUFSIZ];
 683         char *end = NULL;
 684
 685         f = fopen(filename, "r");
 686         if (f == NULL) {
 687                 PMD_INIT_LOG(ERR, "%s(): cannot open sysfs value %s",
 688                              __func__, filename);
 689                 return -1;
 690         }
 691
 692         if (fgets(buf, sizeof(buf), f) == NULL) {
 693                 PMD_INIT_LOG(ERR, "%s(): cannot read sysfs value %s",
 694                              __func__, filename);
 695                 fclose(f);
 696                 return -1;
 697         }
 698         *val = strtoul(buf, &end, 0);
 699         if ((buf[0] == '\0') || (end == NULL) || (*end != '\n')) {
 700                 PMD_INIT_LOG(ERR, "%s(): cannot parse sysfs value %s",
 701                              __func__, filename);
 702                 fclose(f);
 703                 return -1;
 704         }
 705         fclose(f);
 706         return 0;
 707 }
 708
 709 static int get_uio_dev(struct rte_pci_addr *loc, char *buf, unsigned int buflen)
 710 {
 711         unsigned int uio_num;
 712         struct dirent *e;
 713         DIR *dir;
 714         char dirname[PATH_MAX];
 715
 716         /* depending on kernel version, uio can be located in uio/uioX
 717          * or uio:uioX */
 718         snprintf(dirname, sizeof(dirname),
 719                      SYSFS_PCI_DEVICES "/" PCI_PRI_FMT "/uio",
 720                      loc->domain, loc->bus, loc->devid, loc->function);
 721         dir = opendir(dirname);
 722         if (dir == NULL) {
 723                 /* retry with the parent directory */
 724                 snprintf(dirname, sizeof(dirname),
 725                              SYSFS_PCI_DEVICES "/" PCI_PRI_FMT,
 726                              loc->domain, loc->bus, loc->devid, loc->function);
 727                 dir = opendir(dirname);
 728
 729                 if (dir == NULL) {
 730                         PMD_INIT_LOG(ERR, "Cannot opendir %s", dirname);
 731                         return -1;
 732                 }
 733         }
 734
 735         /* take the first file starting with "uio" */
 736         while ((e = readdir(dir)) != NULL) {
 737                 /* format could be uio%d ...*/
 738                 int shortprefix_len = sizeof("uio") - 1;
 739                 /* ... or uio:uio%d */
 740                 int longprefix_len = sizeof("uio:uio") - 1;
 741                 char *endptr;
 742
 743                 if (strncmp(e->d_name, "uio", 3) != 0)
 744                         continue;
 745
 746                 /* first try uio%d */
 747                 errno = 0;
 748                 uio_num = strtoull(e->d_name + shortprefix_len, &endptr, 10);
 749                 if (errno == 0 && endptr != (e->d_name + shortprefix_len)) {
 750                         snprintf(buf, buflen, "%s/uio%u", dirname, uio_num);
 751                         break;
 752                 }
 753
 754                 /* then try uio:uio%d */
 755                 errno = 0;
 756                 uio_num = strtoull(e->d_name + longprefix_len, &endptr, 10);
 757                 if (errno == 0 && endptr != (e->d_name + longprefix_len)) {
 758                         snprintf(buf, buflen, "%s/uio:uio%u", dirname,
 759                                      uio_num);
 760                         break;
 761                 }
 762         }
 763         closedir(dir);
 764
 765         /* No uio resource found */
 766         if (e == NULL) {
 767                 PMD_INIT_LOG(ERR, "Could not find uio resource");
 768                 return -1;
 769         }
 770
 771         return 0;
 772 }
 773
 774 static int
 775 virtio_has_msix(const struct rte_pci_addr *loc)
 776 {
 777         DIR *d;
 778         char dirname[PATH_MAX];
 779
 780         snprintf(dirname, sizeof(dirname),
 781                      SYSFS_PCI_DEVICES "/" PCI_PRI_FMT "/msi_irqs",
 782                      loc->domain, loc->bus, loc->devid, loc->function);
 783
 784         d = opendir(dirname);
 785         if (d)
 786                 closedir(d);
 787
 788         return (d != NULL);
 789 }
 790
 791 /* Extract I/O port numbers from sysfs */
 792 static int virtio_resource_init(struct rte_pci_device *pci_dev)
 793 {
 794         char dirname[PATH_MAX];
 795         char filename[PATH_MAX];
 796         unsigned long start, size;
 797
 798         if (get_uio_dev(&pci_dev->addr, dirname, sizeof(dirname)) < 0)
 799                 return -1;
 800
 801         /* get portio size */
 802         snprintf(filename, sizeof(filename),
 803                      "%s/portio/port0/size", dirname);
 804         if (parse_sysfs_value(filename, &size) < 0) {
 805                 PMD_INIT_LOG(ERR, "%s(): cannot parse size",
 806                              __func__);
 807                 return -1;
 808         }
 809
 810         /* get portio start */
 811         snprintf(filename, sizeof(filename),
 812                  "%s/portio/port0/start", dirname);
 813         if (parse_sysfs_value(filename, &start) < 0) {
 814                 PMD_INIT_LOG(ERR, "%s(): cannot parse portio start",
 815                              __func__);
 816                 return -1;
 817         }
 818         pci_dev->mem_resource[0].addr = (void *)(uintptr_t)start;
 819         pci_dev->mem_resource[0].len =  (uint64_t)size;
 820         PMD_INIT_LOG(DEBUG,
 821                      "PCI Port IO found start=0x%lx with size=0x%lx",
 822                      start, size);
 823         return 0;
 824 }
 825 #else
 826 static int
 827 virtio_has_msix(const struct rte_pci_addr *loc __rte_unused)
 828 {
 829         /* nic_uio does not enable interrupts, return 0 (false). */
 830         return 0;
 831 }
 832
 833 static int virtio_resource_init(struct rte_pci_device *pci_dev __rte_unused)
 834 {
 835         /* no setup required */
 836         return 0;
 837 }
 838 #endif
 839
 840 /*
 841  * Process Virtio Config changed interrupt and call the callback
 842  * if link state changed.
 843  */
 844 static void
 845 virtio_interrupt_handler(__rte_unused struct rte_intr_handle *handle,
 846                          void *param)
 847 {
 848         struct rte_eth_dev *dev = param;
 849         struct virtio_hw *hw = dev->data->dev_private;
 850         uint8_t isr;
 851
 852         /* Read interrupt status which clears interrupt */
 853         isr = vtpci_isr(hw);
 854         PMD_DRV_LOG(INFO, "interrupt status = %#x", isr);
 855
 856         if (rte_intr_enable(&dev->pci_dev->intr_handle) < 0)
 857                 PMD_DRV_LOG(ERR, "interrupt enable failed");
 858
 859         if (isr & VIRTIO_PCI_ISR_CONFIG) {
 860                 if (virtio_dev_link_update(dev, 0) == 0)
 861                         _rte_eth_dev_callback_process(dev,
 862                                                       RTE_ETH_EVENT_INTR_LSC);
 863         }
 864
 865 }
 866
 867 /*
 868  * This function is based on probe() function in virtio_pci.c
 869  * It returns 0 on success.
 870  */
 871 static int
 872 eth_virtio_dev_init(__rte_unused struct eth_driver *eth_drv,
 873                 struct rte_eth_dev *eth_dev)
 874 {
 875         struct virtio_hw *hw = eth_dev->data->dev_private;
 876         struct virtio_net_config *config;
 877         struct virtio_net_config local_config;
 878         uint32_t offset_conf = sizeof(config->mac);
 879         struct rte_pci_device *pci_dev;
 880
 881         RTE_BUILD_BUG_ON(RTE_PKTMBUF_HEADROOM < sizeof(struct virtio_net_hdr));
 882
 883         eth_dev->dev_ops = &virtio_eth_dev_ops;
 884         eth_dev->tx_pkt_burst = &virtio_xmit_pkts;
 885
 886         if (rte_eal_process_type() == RTE_PROC_SECONDARY)
 887                 return 0;
 888
 889         pci_dev = eth_dev->pci_dev;
 890         if (virtio_resource_init(pci_dev) < 0)
 891                 return -1;
 892
 893         hw->use_msix = virtio_has_msix(&pci_dev->addr);
 894         hw->io_base = (uint32_t)(uintptr_t)pci_dev->mem_resource[0].addr;
 895
 896         /* Reset the device although not necessary at startup */
 897         vtpci_reset(hw);
 898
 899         /* Tell the host we've noticed this device. */
 900         vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_ACK);
 901
 902         /* Tell the host we've known how to drive the device. */
 903         vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_DRIVER);
 904         virtio_negotiate_features(hw);
 905
 906         /* Setting up rx_header size for the device */
 907         if (vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) {
 908                 eth_dev->rx_pkt_burst = &virtio_recv_mergeable_pkts;
 909                 hw->vtnet_hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf);
 910         } else {
 911                 eth_dev->rx_pkt_burst = &virtio_recv_pkts;
 912                 hw->vtnet_hdr_size = sizeof(struct virtio_net_hdr);
 913         }
 914
 915         /* Allocate memory for storing MAC addresses */
 916         eth_dev->data->mac_addrs = rte_zmalloc("virtio", ETHER_ADDR_LEN, 0);
 917         if (eth_dev->data->mac_addrs == NULL) {
 918                 PMD_INIT_LOG(ERR,
 919                         "Failed to allocate %d bytes needed to store MAC addresses",
 920                         ETHER_ADDR_LEN);
 921                 return -ENOMEM;
 922         }
 923
 924         /* Copy the permanent MAC address to: virtio_hw */
 925         virtio_get_hwaddr(hw);
 926         ether_addr_copy((struct ether_addr *) hw->mac_addr,
 927                         &eth_dev->data->mac_addrs[0]);
 928         PMD_INIT_LOG(DEBUG,
 929                      "PORT MAC: %02X:%02X:%02X:%02X:%02X:%02X",
 930                      hw->mac_addr[0], hw->mac_addr[1], hw->mac_addr[2],
 931                      hw->mac_addr[3], hw->mac_addr[4], hw->mac_addr[5]);
 932
 933         if (vtpci_with_feature(hw, VIRTIO_NET_F_CTRL_VQ)) {
 934                 config = &local_config;
 935
 936                 if (vtpci_with_feature(hw, VIRTIO_NET_F_STATUS)) {
 937                         offset_conf += sizeof(config->status);
 938                 } else {
 939                         PMD_INIT_LOG(DEBUG,
 940                                      "VIRTIO_NET_F_STATUS is not supported");
 941                         config->status = 0;
 942                 }
 943
 944                 if (vtpci_with_feature(hw, VIRTIO_NET_F_MQ)) {
 945                         offset_conf += sizeof(config->max_virtqueue_pairs);
 946                 } else {
 947                         PMD_INIT_LOG(DEBUG,
 948                                      "VIRTIO_NET_F_MQ is not supported");
 949                         config->max_virtqueue_pairs = 1;
 950                 }
 951
 952                 vtpci_read_dev_config(hw, 0, (uint8_t *)config, offset_conf);
 953
 954                 hw->max_rx_queues =
 955                         (VIRTIO_MAX_RX_QUEUES < config->max_virtqueue_pairs) ?
 956                         VIRTIO_MAX_RX_QUEUES : config->max_virtqueue_pairs;
 957                 hw->max_tx_queues =
 958                         (VIRTIO_MAX_TX_QUEUES < config->max_virtqueue_pairs) ?
 959                         VIRTIO_MAX_TX_QUEUES : config->max_virtqueue_pairs;
 960
 961                 virtio_dev_cq_queue_setup(eth_dev,
 962                                         config->max_virtqueue_pairs * 2,
 963                                         SOCKET_ID_ANY);
 964
 965                 PMD_INIT_LOG(DEBUG, "config->max_virtqueue_pairs=%d",
 966                                 config->max_virtqueue_pairs);
 967                 PMD_INIT_LOG(DEBUG, "config->status=%d", config->status);
 968                 PMD_INIT_LOG(DEBUG,
 969                                 "PORT MAC: %02X:%02X:%02X:%02X:%02X:%02X",
 970                                 config->mac[0], config->mac[1],
 971                                 config->mac[2], config->mac[3],
 972                                 config->mac[4], config->mac[5]);
 973         } else {
 974                 hw->max_rx_queues = 1;
 975                 hw->max_tx_queues = 1;
 976         }
 977
 978         eth_dev->data->nb_rx_queues = hw->max_rx_queues;
 979         eth_dev->data->nb_tx_queues = hw->max_tx_queues;
 980
 981         PMD_INIT_LOG(DEBUG, "hw->max_rx_queues=%d   hw->max_tx_queues=%d",
 982                         hw->max_rx_queues, hw->max_tx_queues);
 983         PMD_INIT_LOG(DEBUG, "port %d vendorID=0x%x deviceID=0x%x",
 984                         eth_dev->data->port_id, pci_dev->id.vendor_id,
 985                         pci_dev->id.device_id);
 986
 987         /* Setup interrupt callback  */
 988         rte_intr_callback_register(&pci_dev->intr_handle,
 989                                    virtio_interrupt_handler, eth_dev);
 990         return 0;
 991 }
 992
 993 static struct eth_driver rte_virtio_pmd = {
 994         {
 995                 .name = "rte_virtio_pmd",
 996                 .id_table = pci_id_virtio_map,
 997                 .drv_flags = RTE_PCI_DRV_NEED_MAPPING | RTE_PCI_DRV_INTR_LSC,
 998         },
 999         .eth_dev_init = eth_virtio_dev_init,
1000         .dev_private_size = sizeof(struct virtio_hw),
1001 };
1002
1003 /*
1004  * Driver initialization routine.
1005  * Invoked once at EAL init time.
1006  * Register itself as the [Poll Mode] Driver of PCI virtio devices.
1007  * Returns 0 on success.
1008  */
1009 static int
1010 rte_virtio_pmd_init(const char *name __rte_unused,
1011                     const char *param __rte_unused)
1012 {
1013         if (rte_eal_iopl_init() != 0) {
1014                 PMD_INIT_LOG(ERR, "IOPL call failed - cannot use virtio PMD");
1015                 return -1;
1016         }
1017
1018         rte_eth_driver_register(&rte_virtio_pmd);
1019         return 0;
1020 }
1021
1022 /*
1023  * Only 1 queue is supported, no queue release related operation
1024  */
1025 static void
1026 virtio_dev_rx_queue_release(__rte_unused void *rxq)
1027 {
1028 }
1029
1030 static void
1031 virtio_dev_tx_queue_release(__rte_unused void *txq)
1032 {
1033 }
1034
1035 /*
1036  * Configure virtio device
1037  * It returns 0 on success.
1038  */
1039 static int
1040 virtio_dev_configure(struct rte_eth_dev *dev)
1041 {
1042         const struct rte_eth_rxmode *rxmode = &dev->data->dev_conf.rxmode;
1043         struct virtio_hw *hw = dev->data->dev_private;
1044         int ret;
1045
1046         PMD_INIT_LOG(DEBUG, "configure");
1047
1048         if (rxmode->hw_ip_checksum) {
1049                 PMD_DRV_LOG(ERR, "HW IP checksum not supported");
1050                 return (-EINVAL);
1051         }
1052
1053         ret = vtpci_irq_config(hw, 0);
1054         if (ret != 0)
1055                 PMD_DRV_LOG(ERR, "failed to set config vector");
1056
1057         return ret;
1058 }
1059
1060
1061 static int
1062 virtio_dev_start(struct rte_eth_dev *dev)
1063 {
1064         uint16_t nb_queues, i;
1065         struct virtio_hw *hw = dev->data->dev_private;
1066
1067         /* Tell the host we've noticed this device. */
1068         vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_ACK);
1069
1070         /* Tell the host we've known how to drive the device. */
1071         vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_DRIVER);
1072
1073         virtio_dev_cq_start(dev);
1074
1075         /* Do final configuration before rx/tx engine starts */
1076         virtio_dev_rxtx_start(dev);
1077
1078         /* check if lsc interrupt feature is enabled */
1079         if (dev->data->dev_conf.intr_conf.lsc) {
1080                 if (!vtpci_with_feature(hw, VIRTIO_NET_F_STATUS)) {
1081                         PMD_DRV_LOG(ERR, "link status not supported by host");
1082                         return -ENOTSUP;
1083                 }
1084
1085                 if (rte_intr_enable(&dev->pci_dev->intr_handle) < 0) {
1086                         PMD_DRV_LOG(ERR, "interrupt enable failed");
1087                         return -EIO;
1088                 }
1089         }
1090
1091         /* Initialize Link state */
1092         virtio_dev_link_update(dev, 0);
1093
1094         vtpci_reinit_complete(hw);
1095
1096         /*Notify the backend
1097          *Otherwise the tap backend might already stop its queue due to fullness.
1098          *vhost backend will have no chance to be waked up
1099          */
1100         nb_queues = dev->data->nb_rx_queues;
1101         if (nb_queues > 1) {
1102                 if (virtio_set_multiple_queues(dev, nb_queues) != 0)
1103                         return -EINVAL;
1104         }
1105
1106         PMD_INIT_LOG(DEBUG, "nb_queues=%d", nb_queues);
1107
1108         for (i = 0; i < nb_queues; i++)
1109                 virtqueue_notify(dev->data->rx_queues[i]);
1110
1111         PMD_INIT_LOG(DEBUG, "Notified backend at initialization");
1112
1113         for (i = 0; i < dev->data->nb_rx_queues; i++)
1114                 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->rx_queues[i]);
1115
1116         for (i = 0; i < dev->data->nb_tx_queues; i++)
1117                 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->tx_queues[i]);
1118
1119         return 0;
1120 }
1121
1122 static void virtio_dev_free_mbufs(struct rte_eth_dev *dev)
1123 {
1124         struct rte_mbuf *buf;
1125         int i, mbuf_num = 0;
1126
1127         for (i = 0; i < dev->data->nb_rx_queues; i++) {
1128                 PMD_INIT_LOG(DEBUG,
1129                              "Before freeing rxq[%d] used and unused buf", i);
1130                 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->rx_queues[i]);
1131
1132                 while ((buf = (struct rte_mbuf *)virtqueue_detatch_unused(
1133                                         dev->data->rx_queues[i])) != NULL) {
1134                         rte_pktmbuf_free(buf);
1135                         mbuf_num++;
1136                 }
1137
1138                 PMD_INIT_LOG(DEBUG, "free %d mbufs", mbuf_num);
1139                 PMD_INIT_LOG(DEBUG,
1140                              "After freeing rxq[%d] used and unused buf", i);
1141                 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->rx_queues[i]);
1142         }
1143
1144         for (i = 0; i < dev->data->nb_tx_queues; i++) {
1145                 PMD_INIT_LOG(DEBUG,
1146                              "Before freeing txq[%d] used and unused bufs",
1147                              i);
1148                 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->tx_queues[i]);
1149
1150                 mbuf_num = 0;
1151                 while ((buf = (struct rte_mbuf *)virtqueue_detatch_unused(
1152                                         dev->data->tx_queues[i])) != NULL) {
1153                         rte_pktmbuf_free(buf);
1154
1155                         mbuf_num++;
1156                 }
1157
1158                 PMD_INIT_LOG(DEBUG, "free %d mbufs", mbuf_num);
1159                 PMD_INIT_LOG(DEBUG,
1160                              "After freeing txq[%d] used and unused buf", i);
1161                 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->tx_queues[i]);
1162         }
1163 }
1164
1165 /*
1166  * Stop device: disable rx and tx functions to allow for reconfiguring.
1167  */
1168 static void
1169 virtio_dev_stop(struct rte_eth_dev *dev)
1170 {
1171         struct virtio_hw *hw = dev->data->dev_private;
1172
1173         /* reset the NIC */
1174         vtpci_irq_config(hw, 0);
1175         vtpci_reset(hw);
1176         virtio_dev_free_mbufs(dev);
1177 }
1178
1179 static int
1180 virtio_dev_link_update(struct rte_eth_dev *dev, __rte_unused int wait_to_complete)
1181 {
1182         struct rte_eth_link link, old;
1183         uint16_t status;
1184         struct virtio_hw *hw = dev->data->dev_private;
1185         memset(&link, 0, sizeof(link));
1186         virtio_dev_atomic_read_link_status(dev, &link);
1187         old = link;
1188         link.link_duplex = FULL_DUPLEX;
1189         link.link_speed  = SPEED_10G;
1190
1191         if (vtpci_with_feature(hw, VIRTIO_NET_F_STATUS)) {
1192                 PMD_INIT_LOG(DEBUG, "Get link status from hw");
1193                 vtpci_read_dev_config(hw,
1194                                 offsetof(struct virtio_net_config, status),
1195                                 &status, sizeof(status));
1196                 if ((status & VIRTIO_NET_S_LINK_UP) == 0) {
1197                         link.link_status = 0;
1198                         PMD_INIT_LOG(DEBUG, "Port %d is down",
1199                                      dev->data->port_id);
1200                 } else {
1201                         link.link_status = 1;
1202                         PMD_INIT_LOG(DEBUG, "Port %d is up",
1203                                      dev->data->port_id);
1204                 }
1205         } else {
1206                 link.link_status = 1;   /* Link up */
1207         }
1208         virtio_dev_atomic_write_link_status(dev, &link);
1209
1210         return (old.link_status == link.link_status) ? -1 : 0;
1211 }
1212
1213 static void
1214 virtio_dev_info_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
1215 {
1216         struct virtio_hw *hw = dev->data->dev_private;
1217
1218         dev_info->driver_name = dev->driver->pci_drv.name;
1219         dev_info->max_rx_queues = (uint16_t)hw->max_rx_queues;
1220         dev_info->max_tx_queues = (uint16_t)hw->max_tx_queues;
1221         dev_info->min_rx_bufsize = VIRTIO_MIN_RX_BUFSIZE;
1222         dev_info->max_rx_pktlen = VIRTIO_MAX_RX_PKTLEN;
1223         dev_info->max_mac_addrs = VIRTIO_MAX_MAC_ADDRS;
1224 }
1225
1226 /*
1227  * It enables testpmd to collect per queue stats.
1228  */
1229 static int
1230 virtio_dev_queue_stats_mapping_set(__rte_unused struct rte_eth_dev *eth_dev,
1231 __rte_unused uint16_t queue_id, __rte_unused uint8_t stat_idx,
1232 __rte_unused uint8_t is_rx)
1233 {
1234         return 0;
1235 }
1236
1237 static struct rte_driver rte_virtio_driver = {
1238         .type = PMD_PDEV,
1239         .init = rte_virtio_pmd_init,
1240 };
1241
1242 PMD_REGISTER_DRIVER(rte_virtio_driver);