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 static int virtio_vlan_filter_set(struct rte_eth_dev *dev,
  88                                 uint16_t vlan_id, int on);
  89
  90 static int virtio_dev_queue_stats_mapping_set(
  91         __rte_unused struct rte_eth_dev *eth_dev,
  92         __rte_unused uint16_t queue_id,
  93         __rte_unused uint8_t stat_idx,
  94         __rte_unused uint8_t is_rx);
  95
  96 /*
  97  * The set of PCI devices this driver supports
  98  */
  99 static struct rte_pci_id pci_id_virtio_map[] = {
 100
 101 #define RTE_PCI_DEV_ID_DECL_VIRTIO(vend, dev) {RTE_PCI_DEVICE(vend, dev)},
 102 #include "rte_pci_dev_ids.h"
 103
 104 { .vendor_id = 0, /* sentinel */ },
 105 };
 106
 107 static int
 108 virtio_send_command(struct virtqueue *vq, struct virtio_pmd_ctrl *ctrl,
 109                 int *dlen, int pkt_num)
 110 {
 111         uint32_t head = vq->vq_desc_head_idx, i;
 112         int k, sum = 0;
 113         virtio_net_ctrl_ack status = ~0;
 114         struct virtio_pmd_ctrl result;
 115
 116         ctrl->status = status;
 117
 118         if (!vq->hw->cvq) {
 119                 PMD_INIT_LOG(ERR,
 120                              "%s(): Control queue is not supported.",
 121                              __func__);
 122                 return -1;
 123         }
 124
 125         PMD_INIT_LOG(DEBUG, "vq->vq_desc_head_idx = %d, status = %d, "
 126                 "vq->hw->cvq = %p vq = %p",
 127                 vq->vq_desc_head_idx, status, vq->hw->cvq, vq);
 128
 129         if ((vq->vq_free_cnt < ((uint32_t)pkt_num + 2)) || (pkt_num < 1))
 130                 return -1;
 131
 132         memcpy(vq->virtio_net_hdr_mz->addr, ctrl,
 133                 sizeof(struct virtio_pmd_ctrl));
 134
 135         /*
 136          * Format is enforced in qemu code:
 137          * One TX packet for header;
 138          * At least one TX packet per argument;
 139          * One RX packet for ACK.
 140          */
 141         vq->vq_ring.desc[head].flags = VRING_DESC_F_NEXT;
 142         vq->vq_ring.desc[head].addr = vq->virtio_net_hdr_mz->phys_addr;
 143         vq->vq_ring.desc[head].len = sizeof(struct virtio_net_ctrl_hdr);
 144         vq->vq_free_cnt--;
 145         i = vq->vq_ring.desc[head].next;
 146
 147         for (k = 0; k < pkt_num; k++) {
 148                 vq->vq_ring.desc[i].flags = VRING_DESC_F_NEXT;
 149                 vq->vq_ring.desc[i].addr = vq->virtio_net_hdr_mz->phys_addr
 150                         + sizeof(struct virtio_net_ctrl_hdr)
 151                         + sizeof(ctrl->status) + sizeof(uint8_t)*sum;
 152                 vq->vq_ring.desc[i].len = dlen[k];
 153                 sum += dlen[k];
 154                 vq->vq_free_cnt--;
 155                 i = vq->vq_ring.desc[i].next;
 156         }
 157
 158         vq->vq_ring.desc[i].flags = VRING_DESC_F_WRITE;
 159         vq->vq_ring.desc[i].addr = vq->virtio_net_hdr_mz->phys_addr
 160                         + sizeof(struct virtio_net_ctrl_hdr);
 161         vq->vq_ring.desc[i].len = sizeof(ctrl->status);
 162         vq->vq_free_cnt--;
 163
 164         vq->vq_desc_head_idx = vq->vq_ring.desc[i].next;
 165
 166         vq_update_avail_ring(vq, head);
 167         vq_update_avail_idx(vq);
 168
 169         PMD_INIT_LOG(DEBUG, "vq->vq_queue_index = %d", vq->vq_queue_index);
 170
 171         virtqueue_notify(vq);
 172
 173         while (vq->vq_used_cons_idx == vq->vq_ring.used->idx)
 174                 usleep(100);
 175
 176         while (vq->vq_used_cons_idx != vq->vq_ring.used->idx) {
 177                 uint32_t idx, desc_idx, used_idx;
 178                 struct vring_used_elem *uep;
 179
 180                 virtio_rmb();
 181
 182                 used_idx = (uint32_t)(vq->vq_used_cons_idx
 183                                 & (vq->vq_nentries - 1));
 184                 uep = &vq->vq_ring.used->ring[used_idx];
 185                 idx = (uint32_t) uep->id;
 186                 desc_idx = idx;
 187
 188                 while (vq->vq_ring.desc[desc_idx].flags & VRING_DESC_F_NEXT) {
 189                         desc_idx = vq->vq_ring.desc[desc_idx].next;
 190                         vq->vq_free_cnt++;
 191                 }
 192
 193                 vq->vq_ring.desc[desc_idx].next = vq->vq_desc_head_idx;
 194                 vq->vq_desc_head_idx = idx;
 195
 196                 vq->vq_used_cons_idx++;
 197                 vq->vq_free_cnt++;
 198         }
 199
 200         PMD_INIT_LOG(DEBUG, "vq->vq_free_cnt=%d\nvq->vq_desc_head_idx=%d",
 201                         vq->vq_free_cnt, vq->vq_desc_head_idx);
 202
 203         memcpy(&result, vq->virtio_net_hdr_mz->addr,
 204                         sizeof(struct virtio_pmd_ctrl));
 205
 206         return result.status;
 207 }
 208
 209 static int
 210 virtio_set_multiple_queues(struct rte_eth_dev *dev, uint16_t nb_queues)
 211 {
 212         struct virtio_hw *hw = dev->data->dev_private;
 213         struct virtio_pmd_ctrl ctrl;
 214         int dlen[1];
 215         int ret;
 216
 217         ctrl.hdr.class = VIRTIO_NET_CTRL_MQ;
 218         ctrl.hdr.cmd = VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET;
 219         memcpy(ctrl.data, &nb_queues, sizeof(uint16_t));
 220
 221         dlen[0] = sizeof(uint16_t);
 222
 223         ret = virtio_send_command(hw->cvq, &ctrl, dlen, 1);
 224
 225         if (ret) {
 226                 PMD_INIT_LOG(ERR, "Multiqueue configured but send command "
 227                           "failed, this is too late now...");
 228                 return -EINVAL;
 229         }
 230
 231         return 0;
 232 }
 233
 234 int virtio_dev_queue_setup(struct rte_eth_dev *dev,
 235                         int queue_type,
 236                         uint16_t queue_idx,
 237                         uint8_t  vtpci_queue_idx,
 238                         uint16_t nb_desc,
 239                         unsigned int socket_id,
 240                         struct virtqueue **pvq)
 241 {
 242         char vq_name[VIRTQUEUE_MAX_NAME_SZ];
 243         const struct rte_memzone *mz;
 244         uint16_t vq_size;
 245         int size;
 246         struct virtio_hw *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_nentries = vq_size;
 300         vq->vq_free_cnt = vq_size;
 301
 302         /*
 303          * Reserve a memzone for vring elements
 304          */
 305         size = vring_size(vq_size, VIRTIO_PCI_VRING_ALIGN);
 306         vq->vq_ring_size = RTE_ALIGN_CEIL(size, VIRTIO_PCI_VRING_ALIGN);
 307         PMD_INIT_LOG(DEBUG, "vring_size: %d, rounded_vring_size: %d", size, vq->vq_ring_size);
 308
 309         mz = rte_memzone_reserve_aligned(vq_name, vq->vq_ring_size,
 310                 socket_id, 0, VIRTIO_PCI_VRING_ALIGN);
 311         if (mz == NULL) {
 312                 rte_free(vq);
 313                 return -ENOMEM;
 314         }
 315
 316         /*
 317          * Virtio PCI device VIRTIO_PCI_QUEUE_PF register is 32bit,
 318          * and only accepts 32 bit page frame number.
 319          * Check if the allocated physical memory exceeds 16TB.
 320          */
 321         if ((mz->phys_addr + vq->vq_ring_size - 1) >> (VIRTIO_PCI_QUEUE_ADDR_SHIFT + 32)) {
 322                 PMD_INIT_LOG(ERR, "vring address shouldn't be above 16TB!");
 323                 rte_free(vq);
 324                 return -ENOMEM;
 325         }
 326
 327         memset(mz->addr, 0, sizeof(mz->len));
 328         vq->mz = mz;
 329         vq->vq_ring_mem = mz->phys_addr;
 330         vq->vq_ring_virt_mem = mz->addr;
 331         PMD_INIT_LOG(DEBUG, "vq->vq_ring_mem:      0x%"PRIx64, (uint64_t)mz->phys_addr);
 332         PMD_INIT_LOG(DEBUG, "vq->vq_ring_virt_mem: 0x%"PRIx64, (uint64_t)mz->addr);
 333         vq->virtio_net_hdr_mz  = NULL;
 334         vq->virtio_net_hdr_mem = 0;
 335
 336         if (queue_type == VTNET_TQ) {
 337                 /*
 338                  * For each xmit packet, allocate a virtio_net_hdr
 339                  */
 340                 snprintf(vq_name, sizeof(vq_name), "port%d_tvq%d_hdrzone",
 341                         dev->data->port_id, queue_idx);
 342                 vq->virtio_net_hdr_mz = rte_memzone_reserve_aligned(vq_name,
 343                         vq_size * hw->vtnet_hdr_size,
 344                         socket_id, 0, RTE_CACHE_LINE_SIZE);
 345                 if (vq->virtio_net_hdr_mz == NULL) {
 346                         rte_free(vq);
 347                         return -ENOMEM;
 348                 }
 349                 vq->virtio_net_hdr_mem =
 350                         vq->virtio_net_hdr_mz->phys_addr;
 351                 memset(vq->virtio_net_hdr_mz->addr, 0,
 352                         vq_size * hw->vtnet_hdr_size);
 353         } else if (queue_type == VTNET_CQ) {
 354                 /* Allocate a page for control vq command, data and status */
 355                 snprintf(vq_name, sizeof(vq_name), "port%d_cvq_hdrzone",
 356                         dev->data->port_id);
 357                 vq->virtio_net_hdr_mz = rte_memzone_reserve_aligned(vq_name,
 358                         PAGE_SIZE, socket_id, 0, RTE_CACHE_LINE_SIZE);
 359                 if (vq->virtio_net_hdr_mz == NULL) {
 360                         rte_free(vq);
 361                         return -ENOMEM;
 362                 }
 363                 vq->virtio_net_hdr_mem =
 364                         vq->virtio_net_hdr_mz->phys_addr;
 365                 memset(vq->virtio_net_hdr_mz->addr, 0, PAGE_SIZE);
 366         }
 367
 368         /*
 369          * Set guest physical address of the virtqueue
 370          * in VIRTIO_PCI_QUEUE_PFN config register of device
 371          */
 372         VIRTIO_WRITE_REG_4(hw, VIRTIO_PCI_QUEUE_PFN,
 373                         mz->phys_addr >> VIRTIO_PCI_QUEUE_ADDR_SHIFT);
 374         *pvq = vq;
 375         return 0;
 376 }
 377
 378 static int
 379 virtio_dev_cq_queue_setup(struct rte_eth_dev *dev, uint16_t vtpci_queue_idx,
 380                 uint32_t socket_id)
 381 {
 382         struct virtqueue *vq;
 383         uint16_t nb_desc = 0;
 384         int ret;
 385         struct virtio_hw *hw = dev->data->dev_private;
 386
 387         PMD_INIT_FUNC_TRACE();
 388         ret = virtio_dev_queue_setup(dev, VTNET_CQ, VTNET_SQ_CQ_QUEUE_IDX,
 389                         vtpci_queue_idx, nb_desc, socket_id, &vq);
 390
 391         if (ret < 0) {
 392                 PMD_INIT_LOG(ERR, "control vq initialization failed");
 393                 return ret;
 394         }
 395
 396         hw->cvq = vq;
 397         return 0;
 398 }
 399
 400 static void
 401 virtio_dev_close(struct rte_eth_dev *dev)
 402 {
 403         struct virtio_hw *hw = dev->data->dev_private;
 404
 405         PMD_INIT_LOG(DEBUG, "virtio_dev_close");
 406
 407         /* reset the NIC */
 408         vtpci_irq_config(hw, VIRTIO_MSI_NO_VECTOR);
 409         vtpci_reset(hw);
 410         hw->started = 0;
 411         virtio_dev_free_mbufs(dev);
 412 }
 413
 414 static void
 415 virtio_dev_promiscuous_enable(struct rte_eth_dev *dev)
 416 {
 417         struct virtio_hw *hw = dev->data->dev_private;
 418         struct virtio_pmd_ctrl ctrl;
 419         int dlen[1];
 420         int ret;
 421
 422         ctrl.hdr.class = VIRTIO_NET_CTRL_RX;
 423         ctrl.hdr.cmd = VIRTIO_NET_CTRL_RX_PROMISC;
 424         ctrl.data[0] = 1;
 425         dlen[0] = 1;
 426
 427         ret = virtio_send_command(hw->cvq, &ctrl, dlen, 1);
 428
 429         if (ret)
 430                 PMD_INIT_LOG(ERR, "Failed to enable promisc");
 431 }
 432
 433 static void
 434 virtio_dev_promiscuous_disable(struct rte_eth_dev *dev)
 435 {
 436         struct virtio_hw *hw = dev->data->dev_private;
 437         struct virtio_pmd_ctrl ctrl;
 438         int dlen[1];
 439         int ret;
 440
 441         ctrl.hdr.class = VIRTIO_NET_CTRL_RX;
 442         ctrl.hdr.cmd = VIRTIO_NET_CTRL_RX_PROMISC;
 443         ctrl.data[0] = 0;
 444         dlen[0] = 1;
 445
 446         ret = virtio_send_command(hw->cvq, &ctrl, dlen, 1);
 447
 448         if (ret)
 449                 PMD_INIT_LOG(ERR, "Failed to disable promisc");
 450 }
 451
 452 static void
 453 virtio_dev_allmulticast_enable(struct rte_eth_dev *dev)
 454 {
 455         struct virtio_hw *hw = dev->data->dev_private;
 456         struct virtio_pmd_ctrl ctrl;
 457         int dlen[1];
 458         int ret;
 459
 460         ctrl.hdr.class = VIRTIO_NET_CTRL_RX;
 461         ctrl.hdr.cmd = VIRTIO_NET_CTRL_RX_ALLMULTI;
 462         ctrl.data[0] = 1;
 463         dlen[0] = 1;
 464
 465         ret = virtio_send_command(hw->cvq, &ctrl, dlen, 1);
 466
 467         if (ret)
 468                 PMD_INIT_LOG(ERR, "Failed to enable allmulticast");
 469 }
 470
 471 static void
 472 virtio_dev_allmulticast_disable(struct rte_eth_dev *dev)
 473 {
 474         struct virtio_hw *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         .vlan_filter_set         = virtio_vlan_filter_set,
 518 };
 519
 520 static inline int
 521 virtio_dev_atomic_read_link_status(struct rte_eth_dev *dev,
 522                                 struct rte_eth_link *link)
 523 {
 524         struct rte_eth_link *dst = link;
 525         struct rte_eth_link *src = &(dev->data->dev_link);
 526
 527         if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
 528                         *(uint64_t *)src) == 0)
 529                 return -1;
 530
 531         return 0;
 532 }
 533
 534 /**
 535  * Atomically writes the link status information into global
 536  * structure rte_eth_dev.
 537  *
 538  * @param dev
 539  *   - Pointer to the structure rte_eth_dev to read from.
 540  *   - Pointer to the buffer to be saved with the link status.
 541  *
 542  * @return
 543  *   - On success, zero.
 544  *   - On failure, negative value.
 545  */
 546 static inline int
 547 virtio_dev_atomic_write_link_status(struct rte_eth_dev *dev,
 548                 struct rte_eth_link *link)
 549 {
 550         struct rte_eth_link *dst = &(dev->data->dev_link);
 551         struct rte_eth_link *src = link;
 552
 553         if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
 554                                         *(uint64_t *)src) == 0)
 555                 return -1;
 556
 557         return 0;
 558 }
 559
 560 static void
 561 virtio_dev_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *stats)
 562 {
 563         unsigned i;
 564
 565         for (i = 0; i < dev->data->nb_tx_queues; i++) {
 566                 const struct virtqueue *txvq = dev->data->tx_queues[i];
 567                 if (txvq == NULL)
 568                         continue;
 569
 570                 stats->opackets += txvq->packets;
 571                 stats->obytes += txvq->bytes;
 572                 stats->oerrors += txvq->errors;
 573
 574                 if (i < RTE_ETHDEV_QUEUE_STAT_CNTRS) {
 575                         stats->q_opackets[i] = txvq->packets;
 576                         stats->q_obytes[i] = txvq->bytes;
 577                 }
 578         }
 579
 580         for (i = 0; i < dev->data->nb_rx_queues; i++) {
 581                 const struct virtqueue *rxvq = dev->data->rx_queues[i];
 582                 if (rxvq == NULL)
 583                         continue;
 584
 585                 stats->ipackets += rxvq->packets;
 586                 stats->ibytes += rxvq->bytes;
 587                 stats->ierrors += rxvq->errors;
 588
 589                 if (i < RTE_ETHDEV_QUEUE_STAT_CNTRS) {
 590                         stats->q_ipackets[i] = rxvq->packets;
 591                         stats->q_ibytes[i] = rxvq->bytes;
 592                 }
 593         }
 594
 595         stats->rx_nombuf = dev->data->rx_mbuf_alloc_failed;
 596 }
 597
 598 static void
 599 virtio_dev_stats_reset(struct rte_eth_dev *dev)
 600 {
 601         unsigned int i;
 602
 603         for (i = 0; i < dev->data->nb_tx_queues; i++) {
 604                 struct virtqueue *txvq = dev->data->tx_queues[i];
 605                 if (txvq == NULL)
 606                         continue;
 607
 608                 txvq->packets = 0;
 609                 txvq->bytes = 0;
 610                 txvq->errors = 0;
 611         }
 612
 613         for (i = 0; i < dev->data->nb_rx_queues; i++) {
 614                 struct virtqueue *rxvq = dev->data->rx_queues[i];
 615                 if (rxvq == NULL)
 616                         continue;
 617
 618                 rxvq->packets = 0;
 619                 rxvq->bytes = 0;
 620                 rxvq->errors = 0;
 621         }
 622
 623         dev->data->rx_mbuf_alloc_failed = 0;
 624 }
 625
 626 static void
 627 virtio_set_hwaddr(struct virtio_hw *hw)
 628 {
 629         vtpci_write_dev_config(hw,
 630                         offsetof(struct virtio_net_config, mac),
 631                         &hw->mac_addr, ETHER_ADDR_LEN);
 632 }
 633
 634 static void
 635 virtio_get_hwaddr(struct virtio_hw *hw)
 636 {
 637         if (vtpci_with_feature(hw, VIRTIO_NET_F_MAC)) {
 638                 vtpci_read_dev_config(hw,
 639                         offsetof(struct virtio_net_config, mac),
 640                         &hw->mac_addr, ETHER_ADDR_LEN);
 641         } else {
 642                 eth_random_addr(&hw->mac_addr[0]);
 643                 virtio_set_hwaddr(hw);
 644         }
 645 }
 646
 647 static int
 648 virtio_vlan_filter_set(struct rte_eth_dev *dev, uint16_t vlan_id, int on)
 649 {
 650         struct virtio_hw *hw = dev->data->dev_private;
 651         struct virtio_pmd_ctrl ctrl;
 652         int len;
 653
 654         if (!vtpci_with_feature(hw, VIRTIO_NET_F_CTRL_VLAN))
 655                 return -ENOTSUP;
 656
 657         ctrl.hdr.class = VIRTIO_NET_CTRL_VLAN;
 658         ctrl.hdr.cmd = on ? VIRTIO_NET_CTRL_VLAN_ADD : VIRTIO_NET_CTRL_VLAN_DEL;
 659         memcpy(ctrl.data, &vlan_id, sizeof(vlan_id));
 660         len = sizeof(vlan_id);
 661
 662         return virtio_send_command(hw->cvq, &ctrl, &len, 1);
 663 }
 664
 665 static void
 666 virtio_negotiate_features(struct virtio_hw *hw)
 667 {
 668         uint32_t host_features, mask;
 669
 670         /* checksum offload not implemented */
 671         mask = VIRTIO_NET_F_CSUM | VIRTIO_NET_F_GUEST_CSUM;
 672
 673         /* TSO and LRO are only available when their corresponding
 674          * checksum offload feature is also negotiated.
 675          */
 676         mask |= VIRTIO_NET_F_HOST_TSO4 | VIRTIO_NET_F_HOST_TSO6 | VIRTIO_NET_F_HOST_ECN;
 677         mask |= VIRTIO_NET_F_GUEST_TSO4 | VIRTIO_NET_F_GUEST_TSO6 | VIRTIO_NET_F_GUEST_ECN;
 678         mask |= VTNET_LRO_FEATURES;
 679
 680         /* not negotiating INDIRECT descriptor table support */
 681         mask |= VIRTIO_RING_F_INDIRECT_DESC;
 682
 683         /* Prepare guest_features: feature that driver wants to support */
 684         hw->guest_features = VTNET_FEATURES & ~mask;
 685         PMD_INIT_LOG(DEBUG, "guest_features before negotiate = %x",
 686                 hw->guest_features);
 687
 688         /* Read device(host) feature bits */
 689         host_features = VIRTIO_READ_REG_4(hw, VIRTIO_PCI_HOST_FEATURES);
 690         PMD_INIT_LOG(DEBUG, "host_features before negotiate = %x",
 691                 host_features);
 692
 693         /*
 694          * Negotiate features: Subset of device feature bits are written back
 695          * guest feature bits.
 696          */
 697         hw->guest_features = vtpci_negotiate_features(hw, host_features);
 698         PMD_INIT_LOG(DEBUG, "features after negotiate = %x",
 699                 hw->guest_features);
 700 }
 701
 702 #ifdef RTE_EXEC_ENV_LINUXAPP
 703 static int
 704 parse_sysfs_value(const char *filename, unsigned long *val)
 705 {
 706         FILE *f;
 707         char buf[BUFSIZ];
 708         char *end = NULL;
 709
 710         f = fopen(filename, "r");
 711         if (f == NULL) {
 712                 PMD_INIT_LOG(ERR, "%s(): cannot open sysfs value %s",
 713                              __func__, filename);
 714                 return -1;
 715         }
 716
 717         if (fgets(buf, sizeof(buf), f) == NULL) {
 718                 PMD_INIT_LOG(ERR, "%s(): cannot read sysfs value %s",
 719                              __func__, filename);
 720                 fclose(f);
 721                 return -1;
 722         }
 723         *val = strtoul(buf, &end, 0);
 724         if ((buf[0] == '\0') || (end == NULL) || (*end != '\n')) {
 725                 PMD_INIT_LOG(ERR, "%s(): cannot parse sysfs value %s",
 726                              __func__, filename);
 727                 fclose(f);
 728                 return -1;
 729         }
 730         fclose(f);
 731         return 0;
 732 }
 733
 734 static int get_uio_dev(struct rte_pci_addr *loc, char *buf, unsigned int buflen)
 735 {
 736         unsigned int uio_num;
 737         struct dirent *e;
 738         DIR *dir;
 739         char dirname[PATH_MAX];
 740
 741         /* depending on kernel version, uio can be located in uio/uioX
 742          * or uio:uioX */
 743         snprintf(dirname, sizeof(dirname),
 744                      SYSFS_PCI_DEVICES "/" PCI_PRI_FMT "/uio",
 745                      loc->domain, loc->bus, loc->devid, loc->function);
 746         dir = opendir(dirname);
 747         if (dir == NULL) {
 748                 /* retry with the parent directory */
 749                 snprintf(dirname, sizeof(dirname),
 750                              SYSFS_PCI_DEVICES "/" PCI_PRI_FMT,
 751                              loc->domain, loc->bus, loc->devid, loc->function);
 752                 dir = opendir(dirname);
 753
 754                 if (dir == NULL) {
 755                         PMD_INIT_LOG(ERR, "Cannot opendir %s", dirname);
 756                         return -1;
 757                 }
 758         }
 759
 760         /* take the first file starting with "uio" */
 761         while ((e = readdir(dir)) != NULL) {
 762                 /* format could be uio%d ...*/
 763                 int shortprefix_len = sizeof("uio") - 1;
 764                 /* ... or uio:uio%d */
 765                 int longprefix_len = sizeof("uio:uio") - 1;
 766                 char *endptr;
 767
 768                 if (strncmp(e->d_name, "uio", 3) != 0)
 769                         continue;
 770
 771                 /* first try uio%d */
 772                 errno = 0;
 773                 uio_num = strtoull(e->d_name + shortprefix_len, &endptr, 10);
 774                 if (errno == 0 && endptr != (e->d_name + shortprefix_len)) {
 775                         snprintf(buf, buflen, "%s/uio%u", dirname, uio_num);
 776                         break;
 777                 }
 778
 779                 /* then try uio:uio%d */
 780                 errno = 0;
 781                 uio_num = strtoull(e->d_name + longprefix_len, &endptr, 10);
 782                 if (errno == 0 && endptr != (e->d_name + longprefix_len)) {
 783                         snprintf(buf, buflen, "%s/uio:uio%u", dirname,
 784                                      uio_num);
 785                         break;
 786                 }
 787         }
 788         closedir(dir);
 789
 790         /* No uio resource found */
 791         if (e == NULL) {
 792                 PMD_INIT_LOG(ERR, "Could not find uio resource");
 793                 return -1;
 794         }
 795
 796         return 0;
 797 }
 798
 799 static int
 800 virtio_has_msix(const struct rte_pci_addr *loc)
 801 {
 802         DIR *d;
 803         char dirname[PATH_MAX];
 804
 805         snprintf(dirname, sizeof(dirname),
 806                      SYSFS_PCI_DEVICES "/" PCI_PRI_FMT "/msi_irqs",
 807                      loc->domain, loc->bus, loc->devid, loc->function);
 808
 809         d = opendir(dirname);
 810         if (d)
 811                 closedir(d);
 812
 813         return (d != NULL);
 814 }
 815
 816 /* Extract I/O port numbers from sysfs */
 817 static int virtio_resource_init(struct rte_pci_device *pci_dev)
 818 {
 819         char dirname[PATH_MAX];
 820         char filename[PATH_MAX];
 821         unsigned long start, size;
 822
 823         if (get_uio_dev(&pci_dev->addr, dirname, sizeof(dirname)) < 0)
 824                 return -1;
 825
 826         /* get portio size */
 827         snprintf(filename, sizeof(filename),
 828                      "%s/portio/port0/size", dirname);
 829         if (parse_sysfs_value(filename, &size) < 0) {
 830                 PMD_INIT_LOG(ERR, "%s(): cannot parse size",
 831                              __func__);
 832                 return -1;
 833         }
 834
 835         /* get portio start */
 836         snprintf(filename, sizeof(filename),
 837                  "%s/portio/port0/start", dirname);
 838         if (parse_sysfs_value(filename, &start) < 0) {
 839                 PMD_INIT_LOG(ERR, "%s(): cannot parse portio start",
 840                              __func__);
 841                 return -1;
 842         }
 843         pci_dev->mem_resource[0].addr = (void *)(uintptr_t)start;
 844         pci_dev->mem_resource[0].len =  (uint64_t)size;
 845         PMD_INIT_LOG(DEBUG,
 846                      "PCI Port IO found start=0x%lx with size=0x%lx",
 847                      start, size);
 848         return 0;
 849 }
 850 #else
 851 static int
 852 virtio_has_msix(const struct rte_pci_addr *loc __rte_unused)
 853 {
 854         /* nic_uio does not enable interrupts, return 0 (false). */
 855         return 0;
 856 }
 857
 858 static int virtio_resource_init(struct rte_pci_device *pci_dev __rte_unused)
 859 {
 860         /* no setup required */
 861         return 0;
 862 }
 863 #endif
 864
 865 /*
 866  * Process Virtio Config changed interrupt and call the callback
 867  * if link state changed.
 868  */
 869 static void
 870 virtio_interrupt_handler(__rte_unused struct rte_intr_handle *handle,
 871                          void *param)
 872 {
 873         struct rte_eth_dev *dev = param;
 874         struct virtio_hw *hw = dev->data->dev_private;
 875         uint8_t isr;
 876
 877         /* Read interrupt status which clears interrupt */
 878         isr = vtpci_isr(hw);
 879         PMD_DRV_LOG(INFO, "interrupt status = %#x", isr);
 880
 881         if (rte_intr_enable(&dev->pci_dev->intr_handle) < 0)
 882                 PMD_DRV_LOG(ERR, "interrupt enable failed");
 883
 884         if (isr & VIRTIO_PCI_ISR_CONFIG) {
 885                 if (virtio_dev_link_update(dev, 0) == 0)
 886                         _rte_eth_dev_callback_process(dev,
 887                                                       RTE_ETH_EVENT_INTR_LSC);
 888         }
 889
 890 }
 891
 892 /*
 893  * This function is based on probe() function in virtio_pci.c
 894  * It returns 0 on success.
 895  */
 896 static int
 897 eth_virtio_dev_init(__rte_unused struct eth_driver *eth_drv,
 898                 struct rte_eth_dev *eth_dev)
 899 {
 900         struct virtio_hw *hw = eth_dev->data->dev_private;
 901         struct virtio_net_config *config;
 902         struct virtio_net_config local_config;
 903         uint32_t offset_conf = sizeof(config->mac);
 904         struct rte_pci_device *pci_dev;
 905
 906         RTE_BUILD_BUG_ON(RTE_PKTMBUF_HEADROOM < sizeof(struct virtio_net_hdr));
 907
 908         eth_dev->dev_ops = &virtio_eth_dev_ops;
 909         eth_dev->tx_pkt_burst = &virtio_xmit_pkts;
 910
 911         if (rte_eal_process_type() == RTE_PROC_SECONDARY)
 912                 return 0;
 913
 914         /* Allocate memory for storing MAC addresses */
 915         eth_dev->data->mac_addrs = rte_zmalloc("virtio", ETHER_ADDR_LEN, 0);
 916         if (eth_dev->data->mac_addrs == NULL) {
 917                 PMD_INIT_LOG(ERR,
 918                         "Failed to allocate %d bytes needed to store MAC addresses",
 919                         ETHER_ADDR_LEN);
 920                 return -ENOMEM;
 921         }
 922
 923         pci_dev = eth_dev->pci_dev;
 924         if (virtio_resource_init(pci_dev) < 0)
 925                 return -1;
 926
 927         hw->use_msix = virtio_has_msix(&pci_dev->addr);
 928         hw->io_base = (uint32_t)(uintptr_t)pci_dev->mem_resource[0].addr;
 929
 930         /* Reset the device although not necessary at startup */
 931         vtpci_reset(hw);
 932
 933         /* Tell the host we've noticed this device. */
 934         vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_ACK);
 935
 936         /* Tell the host we've known how to drive the device. */
 937         vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_DRIVER);
 938         virtio_negotiate_features(hw);
 939
 940         /* Setting up rx_header size for the device */
 941         if (vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) {
 942                 eth_dev->rx_pkt_burst = &virtio_recv_mergeable_pkts;
 943                 hw->vtnet_hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf);
 944         } else {
 945                 eth_dev->rx_pkt_burst = &virtio_recv_pkts;
 946                 hw->vtnet_hdr_size = sizeof(struct virtio_net_hdr);
 947         }
 948
 949         /* Copy the permanent MAC address to: virtio_hw */
 950         virtio_get_hwaddr(hw);
 951         ether_addr_copy((struct ether_addr *) hw->mac_addr,
 952                         &eth_dev->data->mac_addrs[0]);
 953         PMD_INIT_LOG(DEBUG,
 954                      "PORT MAC: %02X:%02X:%02X:%02X:%02X:%02X",
 955                      hw->mac_addr[0], hw->mac_addr[1], hw->mac_addr[2],
 956                      hw->mac_addr[3], hw->mac_addr[4], hw->mac_addr[5]);
 957
 958         if (vtpci_with_feature(hw, VIRTIO_NET_F_CTRL_VQ)) {
 959                 config = &local_config;
 960
 961                 if (vtpci_with_feature(hw, VIRTIO_NET_F_STATUS)) {
 962                         offset_conf += sizeof(config->status);
 963                 } else {
 964                         PMD_INIT_LOG(DEBUG,
 965                                      "VIRTIO_NET_F_STATUS is not supported");
 966                         config->status = 0;
 967                 }
 968
 969                 if (vtpci_with_feature(hw, VIRTIO_NET_F_MQ)) {
 970                         offset_conf += sizeof(config->max_virtqueue_pairs);
 971                 } else {
 972                         PMD_INIT_LOG(DEBUG,
 973                                      "VIRTIO_NET_F_MQ is not supported");
 974                         config->max_virtqueue_pairs = 1;
 975                 }
 976
 977                 vtpci_read_dev_config(hw, 0, (uint8_t *)config, offset_conf);
 978
 979                 hw->max_rx_queues =
 980                         (VIRTIO_MAX_RX_QUEUES < config->max_virtqueue_pairs) ?
 981                         VIRTIO_MAX_RX_QUEUES : config->max_virtqueue_pairs;
 982                 hw->max_tx_queues =
 983                         (VIRTIO_MAX_TX_QUEUES < config->max_virtqueue_pairs) ?
 984                         VIRTIO_MAX_TX_QUEUES : config->max_virtqueue_pairs;
 985
 986                 virtio_dev_cq_queue_setup(eth_dev,
 987                                         config->max_virtqueue_pairs * 2,
 988                                         SOCKET_ID_ANY);
 989
 990                 PMD_INIT_LOG(DEBUG, "config->max_virtqueue_pairs=%d",
 991                                 config->max_virtqueue_pairs);
 992                 PMD_INIT_LOG(DEBUG, "config->status=%d", config->status);
 993                 PMD_INIT_LOG(DEBUG,
 994                                 "PORT MAC: %02X:%02X:%02X:%02X:%02X:%02X",
 995                                 config->mac[0], config->mac[1],
 996                                 config->mac[2], config->mac[3],
 997                                 config->mac[4], config->mac[5]);
 998         } else {
 999                 hw->max_rx_queues = 1;
1000                 hw->max_tx_queues = 1;
1001         }
1002
1003         eth_dev->data->nb_rx_queues = hw->max_rx_queues;
1004         eth_dev->data->nb_tx_queues = hw->max_tx_queues;
1005
1006         PMD_INIT_LOG(DEBUG, "hw->max_rx_queues=%d   hw->max_tx_queues=%d",
1007                         hw->max_rx_queues, hw->max_tx_queues);
1008         PMD_INIT_LOG(DEBUG, "port %d vendorID=0x%x deviceID=0x%x",
1009                         eth_dev->data->port_id, pci_dev->id.vendor_id,
1010                         pci_dev->id.device_id);
1011
1012         /* Setup interrupt callback  */
1013         rte_intr_callback_register(&pci_dev->intr_handle,
1014                                    virtio_interrupt_handler, eth_dev);
1015
1016         virtio_dev_cq_start(eth_dev);
1017
1018         return 0;
1019 }
1020
1021 static struct eth_driver rte_virtio_pmd = {
1022         {
1023                 .name = "rte_virtio_pmd",
1024                 .id_table = pci_id_virtio_map,
1025                 .drv_flags = RTE_PCI_DRV_NEED_MAPPING | RTE_PCI_DRV_INTR_LSC,
1026         },
1027         .eth_dev_init = eth_virtio_dev_init,
1028         .dev_private_size = sizeof(struct virtio_hw),
1029 };
1030
1031 /*
1032  * Driver initialization routine.
1033  * Invoked once at EAL init time.
1034  * Register itself as the [Poll Mode] Driver of PCI virtio devices.
1035  * Returns 0 on success.
1036  */
1037 static int
1038 rte_virtio_pmd_init(const char *name __rte_unused,
1039                     const char *param __rte_unused)
1040 {
1041         if (rte_eal_iopl_init() != 0) {
1042                 PMD_INIT_LOG(ERR, "IOPL call failed - cannot use virtio PMD");
1043                 return -1;
1044         }
1045
1046         rte_eth_driver_register(&rte_virtio_pmd);
1047         return 0;
1048 }
1049
1050 /*
1051  * Only 1 queue is supported, no queue release related operation
1052  */
1053 static void
1054 virtio_dev_rx_queue_release(__rte_unused void *rxq)
1055 {
1056 }
1057
1058 static void
1059 virtio_dev_tx_queue_release(__rte_unused void *txq)
1060 {
1061 }
1062
1063 /*
1064  * Configure virtio device
1065  * It returns 0 on success.
1066  */
1067 static int
1068 virtio_dev_configure(struct rte_eth_dev *dev)
1069 {
1070         const struct rte_eth_rxmode *rxmode = &dev->data->dev_conf.rxmode;
1071         struct virtio_hw *hw = dev->data->dev_private;
1072
1073         PMD_INIT_LOG(DEBUG, "configure");
1074
1075         if (rxmode->hw_ip_checksum) {
1076                 PMD_DRV_LOG(ERR, "HW IP checksum not supported");
1077                 return (-EINVAL);
1078         }
1079
1080         hw->vlan_strip = rxmode->hw_vlan_strip;
1081
1082         if (rxmode->hw_vlan_filter
1083             && !vtpci_with_feature(hw, VIRTIO_NET_F_CTRL_VLAN)) {
1084                 PMD_DRV_LOG(NOTICE,
1085                             "vlan filtering not available on this host");
1086                 return -ENOTSUP;
1087         }
1088
1089         if (vtpci_irq_config(hw, 0) == VIRTIO_MSI_NO_VECTOR) {
1090                 PMD_DRV_LOG(ERR, "failed to set config vector");
1091                 return -EBUSY;
1092         }
1093
1094         return 0;
1095 }
1096
1097
1098 static int
1099 virtio_dev_start(struct rte_eth_dev *dev)
1100 {
1101         uint16_t nb_queues, i;
1102         struct virtio_hw *hw = dev->data->dev_private;
1103
1104         /* check if lsc interrupt feature is enabled */
1105         if (dev->data->dev_conf.intr_conf.lsc) {
1106                 if (!vtpci_with_feature(hw, VIRTIO_NET_F_STATUS)) {
1107                         PMD_DRV_LOG(ERR, "link status not supported by host");
1108                         return -ENOTSUP;
1109                 }
1110
1111                 if (rte_intr_enable(&dev->pci_dev->intr_handle) < 0) {
1112                         PMD_DRV_LOG(ERR, "interrupt enable failed");
1113                         return -EIO;
1114                 }
1115         }
1116
1117         /* Initialize Link state */
1118         virtio_dev_link_update(dev, 0);
1119
1120         /* On restart after stop do not touch queues */
1121         if (hw->started)
1122                 return 0;
1123
1124         /* Do final configuration before rx/tx engine starts */
1125         virtio_dev_rxtx_start(dev);
1126         vtpci_reinit_complete(hw);
1127
1128         hw->started = 1;
1129
1130         /*Notify the backend
1131          *Otherwise the tap backend might already stop its queue due to fullness.
1132          *vhost backend will have no chance to be waked up
1133          */
1134         nb_queues = dev->data->nb_rx_queues;
1135         if (nb_queues > 1) {
1136                 if (virtio_set_multiple_queues(dev, nb_queues) != 0)
1137                         return -EINVAL;
1138         }
1139
1140         PMD_INIT_LOG(DEBUG, "nb_queues=%d", nb_queues);
1141
1142         for (i = 0; i < nb_queues; i++)
1143                 virtqueue_notify(dev->data->rx_queues[i]);
1144
1145         PMD_INIT_LOG(DEBUG, "Notified backend at initialization");
1146
1147         for (i = 0; i < dev->data->nb_rx_queues; i++)
1148                 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->rx_queues[i]);
1149
1150         for (i = 0; i < dev->data->nb_tx_queues; i++)
1151                 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->tx_queues[i]);
1152
1153         return 0;
1154 }
1155
1156 static void virtio_dev_free_mbufs(struct rte_eth_dev *dev)
1157 {
1158         struct rte_mbuf *buf;
1159         int i, mbuf_num = 0;
1160
1161         for (i = 0; i < dev->data->nb_rx_queues; i++) {
1162                 PMD_INIT_LOG(DEBUG,
1163                              "Before freeing rxq[%d] used and unused buf", i);
1164                 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->rx_queues[i]);
1165
1166                 while ((buf = (struct rte_mbuf *)virtqueue_detatch_unused(
1167                                         dev->data->rx_queues[i])) != NULL) {
1168                         rte_pktmbuf_free(buf);
1169                         mbuf_num++;
1170                 }
1171
1172                 PMD_INIT_LOG(DEBUG, "free %d mbufs", mbuf_num);
1173                 PMD_INIT_LOG(DEBUG,
1174                              "After freeing rxq[%d] used and unused buf", i);
1175                 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->rx_queues[i]);
1176         }
1177
1178         for (i = 0; i < dev->data->nb_tx_queues; i++) {
1179                 PMD_INIT_LOG(DEBUG,
1180                              "Before freeing txq[%d] used and unused bufs",
1181                              i);
1182                 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->tx_queues[i]);
1183
1184                 mbuf_num = 0;
1185                 while ((buf = (struct rte_mbuf *)virtqueue_detatch_unused(
1186                                         dev->data->tx_queues[i])) != NULL) {
1187                         rte_pktmbuf_free(buf);
1188
1189                         mbuf_num++;
1190                 }
1191
1192                 PMD_INIT_LOG(DEBUG, "free %d mbufs", mbuf_num);
1193                 PMD_INIT_LOG(DEBUG,
1194                              "After freeing txq[%d] used and unused buf", i);
1195                 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->tx_queues[i]);
1196         }
1197 }
1198
1199 /*
1200  * Stop device: disable interrupt and mark link down
1201  */
1202 static void
1203 virtio_dev_stop(struct rte_eth_dev *dev)
1204 {
1205         struct rte_eth_link link;
1206
1207         PMD_INIT_LOG(DEBUG, "stop");
1208
1209         if (dev->data->dev_conf.intr_conf.lsc)
1210                 rte_intr_disable(&dev->pci_dev->intr_handle);
1211
1212         memset(&link, 0, sizeof(link));
1213         virtio_dev_atomic_write_link_status(dev, &link);
1214 }
1215
1216 static int
1217 virtio_dev_link_update(struct rte_eth_dev *dev, __rte_unused int wait_to_complete)
1218 {
1219         struct rte_eth_link link, old;
1220         uint16_t status;
1221         struct virtio_hw *hw = dev->data->dev_private;
1222         memset(&link, 0, sizeof(link));
1223         virtio_dev_atomic_read_link_status(dev, &link);
1224         old = link;
1225         link.link_duplex = FULL_DUPLEX;
1226         link.link_speed  = SPEED_10G;
1227
1228         if (vtpci_with_feature(hw, VIRTIO_NET_F_STATUS)) {
1229                 PMD_INIT_LOG(DEBUG, "Get link status from hw");
1230                 vtpci_read_dev_config(hw,
1231                                 offsetof(struct virtio_net_config, status),
1232                                 &status, sizeof(status));
1233                 if ((status & VIRTIO_NET_S_LINK_UP) == 0) {
1234                         link.link_status = 0;
1235                         PMD_INIT_LOG(DEBUG, "Port %d is down",
1236                                      dev->data->port_id);
1237                 } else {
1238                         link.link_status = 1;
1239                         PMD_INIT_LOG(DEBUG, "Port %d is up",
1240                                      dev->data->port_id);
1241                 }
1242         } else {
1243                 link.link_status = 1;   /* Link up */
1244         }
1245         virtio_dev_atomic_write_link_status(dev, &link);
1246
1247         return (old.link_status == link.link_status) ? -1 : 0;
1248 }
1249
1250 static void
1251 virtio_dev_info_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
1252 {
1253         struct virtio_hw *hw = dev->data->dev_private;
1254
1255         dev_info->driver_name = dev->driver->pci_drv.name;
1256         dev_info->max_rx_queues = (uint16_t)hw->max_rx_queues;
1257         dev_info->max_tx_queues = (uint16_t)hw->max_tx_queues;
1258         dev_info->min_rx_bufsize = VIRTIO_MIN_RX_BUFSIZE;
1259         dev_info->max_rx_pktlen = VIRTIO_MAX_RX_PKTLEN;
1260         dev_info->max_mac_addrs = VIRTIO_MAX_MAC_ADDRS;
1261 }
1262
1263 /*
1264  * It enables testpmd to collect per queue stats.
1265  */
1266 static int
1267 virtio_dev_queue_stats_mapping_set(__rte_unused struct rte_eth_dev *eth_dev,
1268 __rte_unused uint16_t queue_id, __rte_unused uint8_t stat_idx,
1269 __rte_unused uint8_t is_rx)
1270 {
1271         return 0;
1272 }
1273
1274 static struct rte_driver rte_virtio_driver = {
1275         .type = PMD_PDEV,
1276         .init = rte_virtio_pmd_init,
1277 };
1278
1279 PMD_REGISTER_DRIVER(rte_virtio_driver);