lib/librte_vhost/vhost_user.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2016 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 <stdio.h>
  36 #include <stdlib.h>
  37 #include <string.h>
  38 #include <unistd.h>
  39 #include <sys/mman.h>
  40 #include <sys/types.h>
  41 #include <sys/stat.h>
  42 #include <assert.h>
  43 #ifdef RTE_LIBRTE_VHOST_NUMA
  44 #include <numaif.h>
  45 #endif
  46
  47 #include <rte_common.h>
  48 #include <rte_malloc.h>
  49 #include <rte_log.h>
  50
  51 #include "iotlb.h"
  52 #include "vhost.h"
  53 #include "vhost_user.h"
  54
  55 #define VIRTIO_MIN_MTU 68
  56 #define VIRTIO_MAX_MTU 65535
  57
  58 static const char *vhost_message_str[VHOST_USER_MAX] = {
  59         [VHOST_USER_NONE] = "VHOST_USER_NONE",
  60         [VHOST_USER_GET_FEATURES] = "VHOST_USER_GET_FEATURES",
  61         [VHOST_USER_SET_FEATURES] = "VHOST_USER_SET_FEATURES",
  62         [VHOST_USER_SET_OWNER] = "VHOST_USER_SET_OWNER",
  63         [VHOST_USER_RESET_OWNER] = "VHOST_USER_RESET_OWNER",
  64         [VHOST_USER_SET_MEM_TABLE] = "VHOST_USER_SET_MEM_TABLE",
  65         [VHOST_USER_SET_LOG_BASE] = "VHOST_USER_SET_LOG_BASE",
  66         [VHOST_USER_SET_LOG_FD] = "VHOST_USER_SET_LOG_FD",
  67         [VHOST_USER_SET_VRING_NUM] = "VHOST_USER_SET_VRING_NUM",
  68         [VHOST_USER_SET_VRING_ADDR] = "VHOST_USER_SET_VRING_ADDR",
  69         [VHOST_USER_SET_VRING_BASE] = "VHOST_USER_SET_VRING_BASE",
  70         [VHOST_USER_GET_VRING_BASE] = "VHOST_USER_GET_VRING_BASE",
  71         [VHOST_USER_SET_VRING_KICK] = "VHOST_USER_SET_VRING_KICK",
  72         [VHOST_USER_SET_VRING_CALL] = "VHOST_USER_SET_VRING_CALL",
  73         [VHOST_USER_SET_VRING_ERR]  = "VHOST_USER_SET_VRING_ERR",
  74         [VHOST_USER_GET_PROTOCOL_FEATURES]  = "VHOST_USER_GET_PROTOCOL_FEATURES",
  75         [VHOST_USER_SET_PROTOCOL_FEATURES]  = "VHOST_USER_SET_PROTOCOL_FEATURES",
  76         [VHOST_USER_GET_QUEUE_NUM]  = "VHOST_USER_GET_QUEUE_NUM",
  77         [VHOST_USER_SET_VRING_ENABLE]  = "VHOST_USER_SET_VRING_ENABLE",
  78         [VHOST_USER_SEND_RARP]  = "VHOST_USER_SEND_RARP",
  79         [VHOST_USER_NET_SET_MTU]  = "VHOST_USER_NET_SET_MTU",
  80         [VHOST_USER_SET_SLAVE_REQ_FD]  = "VHOST_USER_SET_SLAVE_REQ_FD",
  81         [VHOST_USER_IOTLB_MSG]  = "VHOST_USER_IOTLB_MSG",
  82 };
  83
  84 static uint64_t
  85 get_blk_size(int fd)
  86 {
  87         struct stat stat;
  88         int ret;
  89
  90         ret = fstat(fd, &stat);
  91         return ret == -1 ? (uint64_t)-1 : (uint64_t)stat.st_blksize;
  92 }
  93
  94 static void
  95 free_mem_region(struct virtio_net *dev)
  96 {
  97         uint32_t i;
  98         struct rte_vhost_mem_region *reg;
  99
 100         if (!dev || !dev->mem)
 101                 return;
 102
 103         for (i = 0; i < dev->mem->nregions; i++) {
 104                 reg = &dev->mem->regions[i];
 105                 if (reg->host_user_addr) {
 106                         munmap(reg->mmap_addr, reg->mmap_size);
 107                         close(reg->fd);
 108                 }
 109         }
 110 }
 111
 112 void
 113 vhost_backend_cleanup(struct virtio_net *dev)
 114 {
 115         if (dev->mem) {
 116                 free_mem_region(dev);
 117                 rte_free(dev->mem);
 118                 dev->mem = NULL;
 119         }
 120
 121         free(dev->guest_pages);
 122         dev->guest_pages = NULL;
 123
 124         if (dev->log_addr) {
 125                 munmap((void *)(uintptr_t)dev->log_addr, dev->log_size);
 126                 dev->log_addr = 0;
 127         }
 128
 129         if (dev->slave_req_fd >= 0) {
 130                 close(dev->slave_req_fd);
 131                 dev->slave_req_fd = -1;
 132         }
 133 }
 134
 135 /*
 136  * This function just returns success at the moment unless
 137  * the device hasn't been initialised.
 138  */
 139 static int
 140 vhost_user_set_owner(void)
 141 {
 142         return 0;
 143 }
 144
 145 static int
 146 vhost_user_reset_owner(struct virtio_net *dev)
 147 {
 148         if (dev->flags & VIRTIO_DEV_RUNNING) {
 149                 dev->flags &= ~VIRTIO_DEV_RUNNING;
 150                 dev->notify_ops->destroy_device(dev->vid);
 151         }
 152
 153         cleanup_device(dev, 0);
 154         reset_device(dev);
 155         return 0;
 156 }
 157
 158 /*
 159  * The features that we support are requested.
 160  */
 161 static uint64_t
 162 vhost_user_get_features(struct virtio_net *dev)
 163 {
 164         uint64_t features = 0;
 165
 166         rte_vhost_driver_get_features(dev->ifname, &features);
 167         return features;
 168 }
 169
 170 /*
 171  * We receive the negotiated features supported by us and the virtio device.
 172  */
 173 static int
 174 vhost_user_set_features(struct virtio_net *dev, uint64_t features)
 175 {
 176         uint64_t vhost_features = 0;
 177
 178         rte_vhost_driver_get_features(dev->ifname, &vhost_features);
 179         if (features & ~vhost_features) {
 180                 RTE_LOG(ERR, VHOST_CONFIG,
 181                         "(%d) received invalid negotiated features.\n",
 182                         dev->vid);
 183                 return -1;
 184         }
 185
 186         if ((dev->flags & VIRTIO_DEV_RUNNING) && dev->features != features) {
 187                 if (dev->notify_ops->features_changed)
 188                         dev->notify_ops->features_changed(dev->vid, features);
 189         }
 190
 191         dev->features = features;
 192         if (dev->features &
 193                 ((1 << VIRTIO_NET_F_MRG_RXBUF) | (1ULL << VIRTIO_F_VERSION_1))) {
 194                 dev->vhost_hlen = sizeof(struct virtio_net_hdr_mrg_rxbuf);
 195         } else {
 196                 dev->vhost_hlen = sizeof(struct virtio_net_hdr);
 197         }
 198         LOG_DEBUG(VHOST_CONFIG,
 199                 "(%d) mergeable RX buffers %s, virtio 1 %s\n",
 200                 dev->vid,
 201                 (dev->features & (1 << VIRTIO_NET_F_MRG_RXBUF)) ? "on" : "off",
 202                 (dev->features & (1ULL << VIRTIO_F_VERSION_1)) ? "on" : "off");
 203
 204         return 0;
 205 }
 206
 207 /*
 208  * The virtio device sends us the size of the descriptor ring.
 209  */
 210 static int
 211 vhost_user_set_vring_num(struct virtio_net *dev,
 212                          VhostUserMsg *msg)
 213 {
 214         struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index];
 215
 216         vq->size = msg->payload.state.num;
 217
 218         if (dev->dequeue_zero_copy) {
 219                 vq->nr_zmbuf = 0;
 220                 vq->last_zmbuf_idx = 0;
 221                 vq->zmbuf_size = vq->size;
 222                 vq->zmbufs = rte_zmalloc(NULL, vq->zmbuf_size *
 223                                          sizeof(struct zcopy_mbuf), 0);
 224                 if (vq->zmbufs == NULL) {
 225                         RTE_LOG(WARNING, VHOST_CONFIG,
 226                                 "failed to allocate mem for zero copy; "
 227                                 "zero copy is force disabled\n");
 228                         dev->dequeue_zero_copy = 0;
 229                 }
 230         }
 231
 232         vq->shadow_used_ring = rte_malloc(NULL,
 233                                 vq->size * sizeof(struct vring_used_elem),
 234                                 RTE_CACHE_LINE_SIZE);
 235         if (!vq->shadow_used_ring) {
 236                 RTE_LOG(ERR, VHOST_CONFIG,
 237                         "failed to allocate memory for shadow used ring.\n");
 238                 return -1;
 239         }
 240
 241         vq->batch_copy_elems = rte_malloc(NULL,
 242                                 vq->size * sizeof(struct batch_copy_elem),
 243                                 RTE_CACHE_LINE_SIZE);
 244         if (!vq->batch_copy_elems) {
 245                 RTE_LOG(ERR, VHOST_CONFIG,
 246                         "failed to allocate memory for batching copy.\n");
 247                 return -1;
 248         }
 249
 250         return 0;
 251 }
 252
 253 /*
 254  * Reallocate virtio_dev and vhost_virtqueue data structure to make them on the
 255  * same numa node as the memory of vring descriptor.
 256  */
 257 #ifdef RTE_LIBRTE_VHOST_NUMA
 258 static struct virtio_net*
 259 numa_realloc(struct virtio_net *dev, int index)
 260 {
 261         int oldnode, newnode;
 262         struct virtio_net *old_dev;
 263         struct vhost_virtqueue *old_vq, *vq;
 264         int ret;
 265
 266         old_dev = dev;
 267         vq = old_vq = dev->virtqueue[index];
 268
 269         ret = get_mempolicy(&newnode, NULL, 0, old_vq->desc,
 270                             MPOL_F_NODE | MPOL_F_ADDR);
 271
 272         /* check if we need to reallocate vq */
 273         ret |= get_mempolicy(&oldnode, NULL, 0, old_vq,
 274                              MPOL_F_NODE | MPOL_F_ADDR);
 275         if (ret) {
 276                 RTE_LOG(ERR, VHOST_CONFIG,
 277                         "Unable to get vq numa information.\n");
 278                 return dev;
 279         }
 280         if (oldnode != newnode) {
 281                 RTE_LOG(INFO, VHOST_CONFIG,
 282                         "reallocate vq from %d to %d node\n", oldnode, newnode);
 283                 vq = rte_malloc_socket(NULL, sizeof(*vq), 0, newnode);
 284                 if (!vq)
 285                         return dev;
 286
 287                 memcpy(vq, old_vq, sizeof(*vq));
 288                 rte_free(old_vq);
 289         }
 290
 291         /* check if we need to reallocate dev */
 292         ret = get_mempolicy(&oldnode, NULL, 0, old_dev,
 293                             MPOL_F_NODE | MPOL_F_ADDR);
 294         if (ret) {
 295                 RTE_LOG(ERR, VHOST_CONFIG,
 296                         "Unable to get dev numa information.\n");
 297                 goto out;
 298         }
 299         if (oldnode != newnode) {
 300                 RTE_LOG(INFO, VHOST_CONFIG,
 301                         "reallocate dev from %d to %d node\n",
 302                         oldnode, newnode);
 303                 dev = rte_malloc_socket(NULL, sizeof(*dev), 0, newnode);
 304                 if (!dev) {
 305                         dev = old_dev;
 306                         goto out;
 307                 }
 308
 309                 memcpy(dev, old_dev, sizeof(*dev));
 310                 rte_free(old_dev);
 311         }
 312
 313 out:
 314         dev->virtqueue[index] = vq;
 315         vhost_devices[dev->vid] = dev;
 316
 317         if (old_vq != vq)
 318                 vhost_user_iotlb_init(dev, index);
 319
 320         return dev;
 321 }
 322 #else
 323 static struct virtio_net*
 324 numa_realloc(struct virtio_net *dev, int index __rte_unused)
 325 {
 326         return dev;
 327 }
 328 #endif
 329
 330 /* Converts QEMU virtual address to Vhost virtual address. */
 331 static uint64_t
 332 qva_to_vva(struct virtio_net *dev, uint64_t qva, uint64_t *len)
 333 {
 334         struct rte_vhost_mem_region *r;
 335         uint32_t i;
 336
 337         /* Find the region where the address lives. */
 338         for (i = 0; i < dev->mem->nregions; i++) {
 339                 r = &dev->mem->regions[i];
 340
 341                 if (qva >= r->guest_user_addr &&
 342                     qva <  r->guest_user_addr + r->size) {
 343
 344                         if (unlikely(*len > r->guest_user_addr + r->size - qva))
 345                                 *len = r->guest_user_addr + r->size - qva;
 346
 347                         return qva - r->guest_user_addr +
 348                                r->host_user_addr;
 349                 }
 350         }
 351         *len = 0;
 352
 353         return 0;
 354 }
 355
 356
 357 /*
 358  * Converts ring address to Vhost virtual address.
 359  * If IOMMU is enabled, the ring address is a guest IO virtual address,
 360  * else it is a QEMU virtual address.
 361  */
 362 static uint64_t
 363 ring_addr_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
 364                 uint64_t ra, uint64_t *size)
 365 {
 366         if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)) {
 367                 uint64_t vva;
 368
 369                 vva = vhost_user_iotlb_cache_find(vq, ra,
 370                                         size, VHOST_ACCESS_RW);
 371                 if (!vva)
 372                         vhost_user_iotlb_miss(dev, ra, VHOST_ACCESS_RW);
 373
 374                 return vva;
 375         }
 376
 377         return qva_to_vva(dev, ra, size);
 378 }
 379
 380 static struct virtio_net *
 381 translate_ring_addresses(struct virtio_net *dev, int vq_index)
 382 {
 383         struct vhost_virtqueue *vq = dev->virtqueue[vq_index];
 384         struct vhost_vring_addr *addr = &vq->ring_addrs;
 385         uint64_t len;
 386
 387         /* The addresses are converted from QEMU virtual to Vhost virtual. */
 388         if (vq->desc && vq->avail && vq->used)
 389                 return dev;
 390
 391         len = sizeof(struct vring_desc) * vq->size;
 392         vq->desc = (struct vring_desc *)(uintptr_t)ring_addr_to_vva(dev,
 393                         vq, addr->desc_user_addr, &len);
 394         if (vq->desc == 0 || len != sizeof(struct vring_desc) * vq->size) {
 395                 RTE_LOG(DEBUG, VHOST_CONFIG,
 396                         "(%d) failed to map desc ring.\n",
 397                         dev->vid);
 398                 return dev;
 399         }
 400
 401         dev = numa_realloc(dev, vq_index);
 402         vq = dev->virtqueue[vq_index];
 403         addr = &vq->ring_addrs;
 404
 405         len = sizeof(struct vring_avail) + sizeof(uint16_t) * vq->size;
 406         vq->avail = (struct vring_avail *)(uintptr_t)ring_addr_to_vva(dev,
 407                         vq, addr->avail_user_addr, &len);
 408         if (vq->avail == 0 ||
 409                         len != sizeof(struct vring_avail) +
 410                         sizeof(uint16_t) * vq->size) {
 411                 RTE_LOG(DEBUG, VHOST_CONFIG,
 412                         "(%d) failed to map avail ring.\n",
 413                         dev->vid);
 414                 return dev;
 415         }
 416
 417         len = sizeof(struct vring_used) +
 418                 sizeof(struct vring_used_elem) * vq->size;
 419         vq->used = (struct vring_used *)(uintptr_t)ring_addr_to_vva(dev,
 420                         vq, addr->used_user_addr, &len);
 421         if (vq->used == 0 || len != sizeof(struct vring_used) +
 422                         sizeof(struct vring_used_elem) * vq->size) {
 423                 RTE_LOG(DEBUG, VHOST_CONFIG,
 424                         "(%d) failed to map used ring.\n",
 425                         dev->vid);
 426                 return dev;
 427         }
 428
 429         if (vq->last_used_idx != vq->used->idx) {
 430                 RTE_LOG(WARNING, VHOST_CONFIG,
 431                         "last_used_idx (%u) and vq->used->idx (%u) mismatches; "
 432                         "some packets maybe resent for Tx and dropped for Rx\n",
 433                         vq->last_used_idx, vq->used->idx);
 434                 vq->last_used_idx  = vq->used->idx;
 435                 vq->last_avail_idx = vq->used->idx;
 436         }
 437
 438         vq->log_guest_addr = addr->log_guest_addr;
 439
 440         LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address desc: %p\n",
 441                         dev->vid, vq->desc);
 442         LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address avail: %p\n",
 443                         dev->vid, vq->avail);
 444         LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address used: %p\n",
 445                         dev->vid, vq->used);
 446         LOG_DEBUG(VHOST_CONFIG, "(%d) log_guest_addr: %" PRIx64 "\n",
 447                         dev->vid, vq->log_guest_addr);
 448
 449         return dev;
 450 }
 451
 452 /*
 453  * The virtio device sends us the desc, used and avail ring addresses.
 454  * This function then converts these to our address space.
 455  */
 456 static int
 457 vhost_user_set_vring_addr(struct virtio_net **pdev, VhostUserMsg *msg)
 458 {
 459         struct vhost_virtqueue *vq;
 460         struct vhost_vring_addr *addr = &msg->payload.addr;
 461         struct virtio_net *dev = *pdev;
 462
 463         if (dev->mem == NULL)
 464                 return -1;
 465
 466         /* addr->index refers to the queue index. The txq 1, rxq is 0. */
 467         vq = dev->virtqueue[msg->payload.addr.index];
 468
 469         /*
 470          * Rings addresses should not be interpreted as long as the ring is not
 471          * started and enabled
 472          */
 473         memcpy(&vq->ring_addrs, addr, sizeof(*addr));
 474
 475         vring_invalidate(dev, vq);
 476
 477         if (vq->enabled && (dev->features &
 478                                 (1ULL << VHOST_USER_F_PROTOCOL_FEATURES))) {
 479                 dev = translate_ring_addresses(dev, msg->payload.state.index);
 480                 if (!dev)
 481                         return -1;
 482
 483                 *pdev = dev;
 484         }
 485
 486         return 0;
 487 }
 488
 489 /*
 490  * The virtio device sends us the available ring last used index.
 491  */
 492 static int
 493 vhost_user_set_vring_base(struct virtio_net *dev,
 494                           VhostUserMsg *msg)
 495 {
 496         dev->virtqueue[msg->payload.state.index]->last_used_idx  =
 497                         msg->payload.state.num;
 498         dev->virtqueue[msg->payload.state.index]->last_avail_idx =
 499                         msg->payload.state.num;
 500
 501         return 0;
 502 }
 503
 504 static void
 505 add_one_guest_page(struct virtio_net *dev, uint64_t guest_phys_addr,
 506                    uint64_t host_phys_addr, uint64_t size)
 507 {
 508         struct guest_page *page, *last_page;
 509
 510         if (dev->nr_guest_pages == dev->max_guest_pages) {
 511                 dev->max_guest_pages *= 2;
 512                 dev->guest_pages = realloc(dev->guest_pages,
 513                                         dev->max_guest_pages * sizeof(*page));
 514         }
 515
 516         if (dev->nr_guest_pages > 0) {
 517                 last_page = &dev->guest_pages[dev->nr_guest_pages - 1];
 518                 /* merge if the two pages are continuous */
 519                 if (host_phys_addr == last_page->host_phys_addr +
 520                                       last_page->size) {
 521                         last_page->size += size;
 522                         return;
 523                 }
 524         }
 525
 526         page = &dev->guest_pages[dev->nr_guest_pages++];
 527         page->guest_phys_addr = guest_phys_addr;
 528         page->host_phys_addr  = host_phys_addr;
 529         page->size = size;
 530 }
 531
 532 static void
 533 add_guest_pages(struct virtio_net *dev, struct rte_vhost_mem_region *reg,
 534                 uint64_t page_size)
 535 {
 536         uint64_t reg_size = reg->size;
 537         uint64_t host_user_addr  = reg->host_user_addr;
 538         uint64_t guest_phys_addr = reg->guest_phys_addr;
 539         uint64_t host_phys_addr;
 540         uint64_t size;
 541
 542         host_phys_addr = rte_mem_virt2iova((void *)(uintptr_t)host_user_addr);
 543         size = page_size - (guest_phys_addr & (page_size - 1));
 544         size = RTE_MIN(size, reg_size);
 545
 546         add_one_guest_page(dev, guest_phys_addr, host_phys_addr, size);
 547         host_user_addr  += size;
 548         guest_phys_addr += size;
 549         reg_size -= size;
 550
 551         while (reg_size > 0) {
 552                 size = RTE_MIN(reg_size, page_size);
 553                 host_phys_addr = rte_mem_virt2iova((void *)(uintptr_t)
 554                                                   host_user_addr);
 555                 add_one_guest_page(dev, guest_phys_addr, host_phys_addr, size);
 556
 557                 host_user_addr  += size;
 558                 guest_phys_addr += size;
 559                 reg_size -= size;
 560         }
 561 }
 562
 563 #ifdef RTE_LIBRTE_VHOST_DEBUG
 564 /* TODO: enable it only in debug mode? */
 565 static void
 566 dump_guest_pages(struct virtio_net *dev)
 567 {
 568         uint32_t i;
 569         struct guest_page *page;
 570
 571         for (i = 0; i < dev->nr_guest_pages; i++) {
 572                 page = &dev->guest_pages[i];
 573
 574                 RTE_LOG(INFO, VHOST_CONFIG,
 575                         "guest physical page region %u\n"
 576                         "\t guest_phys_addr: %" PRIx64 "\n"
 577                         "\t host_phys_addr : %" PRIx64 "\n"
 578                         "\t size           : %" PRIx64 "\n",
 579                         i,
 580                         page->guest_phys_addr,
 581                         page->host_phys_addr,
 582                         page->size);
 583         }
 584 }
 585 #else
 586 #define dump_guest_pages(dev)
 587 #endif
 588
 589 static bool
 590 vhost_memory_changed(struct VhostUserMemory *new,
 591                      struct rte_vhost_memory *old)
 592 {
 593         uint32_t i;
 594
 595         if (new->nregions != old->nregions)
 596                 return true;
 597
 598         for (i = 0; i < new->nregions; ++i) {
 599                 VhostUserMemoryRegion *new_r = &new->regions[i];
 600                 struct rte_vhost_mem_region *old_r = &old->regions[i];
 601
 602                 if (new_r->guest_phys_addr != old_r->guest_phys_addr)
 603                         return true;
 604                 if (new_r->memory_size != old_r->size)
 605                         return true;
 606                 if (new_r->userspace_addr != old_r->guest_user_addr)
 607                         return true;
 608         }
 609
 610         return false;
 611 }
 612
 613 static int
 614 vhost_user_set_mem_table(struct virtio_net *dev, struct VhostUserMsg *pmsg)
 615 {
 616         struct VhostUserMemory memory = pmsg->payload.memory;
 617         struct rte_vhost_mem_region *reg;
 618         void *mmap_addr;
 619         uint64_t mmap_size;
 620         uint64_t mmap_offset;
 621         uint64_t alignment;
 622         uint32_t i;
 623         int fd;
 624
 625         if (dev->mem && !vhost_memory_changed(&memory, dev->mem)) {
 626                 RTE_LOG(INFO, VHOST_CONFIG,
 627                         "(%d) memory regions not changed\n", dev->vid);
 628
 629                 for (i = 0; i < memory.nregions; i++)
 630                         close(pmsg->fds[i]);
 631
 632                 return 0;
 633         }
 634
 635         if (dev->mem) {
 636                 free_mem_region(dev);
 637                 rte_free(dev->mem);
 638                 dev->mem = NULL;
 639         }
 640
 641         dev->nr_guest_pages = 0;
 642         if (!dev->guest_pages) {
 643                 dev->max_guest_pages = 8;
 644                 dev->guest_pages = malloc(dev->max_guest_pages *
 645                                                 sizeof(struct guest_page));
 646                 if (dev->guest_pages == NULL) {
 647                         RTE_LOG(ERR, VHOST_CONFIG,
 648                                 "(%d) failed to allocate memory "
 649                                 "for dev->guest_pages\n",
 650                                 dev->vid);
 651                         return -1;
 652                 }
 653         }
 654
 655         dev->mem = rte_zmalloc("vhost-mem-table", sizeof(struct rte_vhost_memory) +
 656                 sizeof(struct rte_vhost_mem_region) * memory.nregions, 0);
 657         if (dev->mem == NULL) {
 658                 RTE_LOG(ERR, VHOST_CONFIG,
 659                         "(%d) failed to allocate memory for dev->mem\n",
 660                         dev->vid);
 661                 return -1;
 662         }
 663         dev->mem->nregions = memory.nregions;
 664
 665         for (i = 0; i < memory.nregions; i++) {
 666                 fd  = pmsg->fds[i];
 667                 reg = &dev->mem->regions[i];
 668
 669                 reg->guest_phys_addr = memory.regions[i].guest_phys_addr;
 670                 reg->guest_user_addr = memory.regions[i].userspace_addr;
 671                 reg->size            = memory.regions[i].memory_size;
 672                 reg->fd              = fd;
 673
 674                 mmap_offset = memory.regions[i].mmap_offset;
 675                 mmap_size   = reg->size + mmap_offset;
 676
 677                 /* mmap() without flag of MAP_ANONYMOUS, should be called
 678                  * with length argument aligned with hugepagesz at older
 679                  * longterm version Linux, like 2.6.32 and 3.2.72, or
 680                  * mmap() will fail with EINVAL.
 681                  *
 682                  * to avoid failure, make sure in caller to keep length
 683                  * aligned.
 684                  */
 685                 alignment = get_blk_size(fd);
 686                 if (alignment == (uint64_t)-1) {
 687                         RTE_LOG(ERR, VHOST_CONFIG,
 688                                 "couldn't get hugepage size through fstat\n");
 689                         goto err_mmap;
 690                 }
 691                 mmap_size = RTE_ALIGN_CEIL(mmap_size, alignment);
 692
 693                 mmap_addr = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE,
 694                                  MAP_SHARED | MAP_POPULATE, fd, 0);
 695
 696                 if (mmap_addr == MAP_FAILED) {
 697                         RTE_LOG(ERR, VHOST_CONFIG,
 698                                 "mmap region %u failed.\n", i);
 699                         goto err_mmap;
 700                 }
 701
 702                 reg->mmap_addr = mmap_addr;
 703                 reg->mmap_size = mmap_size;
 704                 reg->host_user_addr = (uint64_t)(uintptr_t)mmap_addr +
 705                                       mmap_offset;
 706
 707                 if (dev->dequeue_zero_copy)
 708                         add_guest_pages(dev, reg, alignment);
 709
 710                 RTE_LOG(INFO, VHOST_CONFIG,
 711                         "guest memory region %u, size: 0x%" PRIx64 "\n"
 712                         "\t guest physical addr: 0x%" PRIx64 "\n"
 713                         "\t guest virtual  addr: 0x%" PRIx64 "\n"
 714                         "\t host  virtual  addr: 0x%" PRIx64 "\n"
 715                         "\t mmap addr : 0x%" PRIx64 "\n"
 716                         "\t mmap size : 0x%" PRIx64 "\n"
 717                         "\t mmap align: 0x%" PRIx64 "\n"
 718                         "\t mmap off  : 0x%" PRIx64 "\n",
 719                         i, reg->size,
 720                         reg->guest_phys_addr,
 721                         reg->guest_user_addr,
 722                         reg->host_user_addr,
 723                         (uint64_t)(uintptr_t)mmap_addr,
 724                         mmap_size,
 725                         alignment,
 726                         mmap_offset);
 727         }
 728
 729         dump_guest_pages(dev);
 730
 731         return 0;
 732
 733 err_mmap:
 734         free_mem_region(dev);
 735         rte_free(dev->mem);
 736         dev->mem = NULL;
 737         return -1;
 738 }
 739
 740 static int
 741 vq_is_ready(struct vhost_virtqueue *vq)
 742 {
 743         return vq && vq->desc && vq->avail && vq->used &&
 744                vq->kickfd != VIRTIO_UNINITIALIZED_EVENTFD &&
 745                vq->callfd != VIRTIO_UNINITIALIZED_EVENTFD;
 746 }
 747
 748 static int
 749 virtio_is_ready(struct virtio_net *dev)
 750 {
 751         struct vhost_virtqueue *vq;
 752         uint32_t i;
 753
 754         if (dev->nr_vring == 0)
 755                 return 0;
 756
 757         for (i = 0; i < dev->nr_vring; i++) {
 758                 vq = dev->virtqueue[i];
 759
 760                 if (!vq_is_ready(vq))
 761                         return 0;
 762         }
 763
 764         RTE_LOG(INFO, VHOST_CONFIG,
 765                 "virtio is now ready for processing.\n");
 766         return 1;
 767 }
 768
 769 static void
 770 vhost_user_set_vring_call(struct virtio_net *dev, struct VhostUserMsg *pmsg)
 771 {
 772         struct vhost_vring_file file;
 773         struct vhost_virtqueue *vq;
 774
 775         file.index = pmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
 776         if (pmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK)
 777                 file.fd = VIRTIO_INVALID_EVENTFD;
 778         else
 779                 file.fd = pmsg->fds[0];
 780         RTE_LOG(INFO, VHOST_CONFIG,
 781                 "vring call idx:%d file:%d\n", file.index, file.fd);
 782
 783         vq = dev->virtqueue[file.index];
 784         if (vq->callfd >= 0)
 785                 close(vq->callfd);
 786
 787         vq->callfd = file.fd;
 788 }
 789
 790 static void
 791 vhost_user_set_vring_kick(struct virtio_net **pdev, struct VhostUserMsg *pmsg)
 792 {
 793         struct vhost_vring_file file;
 794         struct vhost_virtqueue *vq;
 795         struct virtio_net *dev = *pdev;
 796
 797         file.index = pmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
 798         if (pmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK)
 799                 file.fd = VIRTIO_INVALID_EVENTFD;
 800         else
 801                 file.fd = pmsg->fds[0];
 802         RTE_LOG(INFO, VHOST_CONFIG,
 803                 "vring kick idx:%d file:%d\n", file.index, file.fd);
 804
 805         /* Interpret ring addresses only when ring is started. */
 806         dev = translate_ring_addresses(dev, file.index);
 807         if (!dev)
 808                 return;
 809
 810         *pdev = dev;
 811
 812         vq = dev->virtqueue[file.index];
 813
 814         /*
 815          * When VHOST_USER_F_PROTOCOL_FEATURES is not negotiated,
 816          * the ring starts already enabled. Otherwise, it is enabled via
 817          * the SET_VRING_ENABLE message.
 818          */
 819         if (!(dev->features & (1ULL << VHOST_USER_F_PROTOCOL_FEATURES)))
 820                 vq->enabled = 1;
 821
 822         if (vq->kickfd >= 0)
 823                 close(vq->kickfd);
 824         vq->kickfd = file.fd;
 825 }
 826
 827 static void
 828 free_zmbufs(struct vhost_virtqueue *vq)
 829 {
 830         struct zcopy_mbuf *zmbuf, *next;
 831
 832         for (zmbuf = TAILQ_FIRST(&vq->zmbuf_list);
 833              zmbuf != NULL; zmbuf = next) {
 834                 next = TAILQ_NEXT(zmbuf, next);
 835
 836                 rte_pktmbuf_free(zmbuf->mbuf);
 837                 TAILQ_REMOVE(&vq->zmbuf_list, zmbuf, next);
 838         }
 839
 840         rte_free(vq->zmbufs);
 841 }
 842
 843 /*
 844  * when virtio is stopped, qemu will send us the GET_VRING_BASE message.
 845  */
 846 static int
 847 vhost_user_get_vring_base(struct virtio_net *dev,
 848                           VhostUserMsg *msg)
 849 {
 850         struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index];
 851
 852         /* We have to stop the queue (virtio) if it is running. */
 853         if (dev->flags & VIRTIO_DEV_RUNNING) {
 854                 dev->flags &= ~VIRTIO_DEV_RUNNING;
 855                 dev->notify_ops->destroy_device(dev->vid);
 856         }
 857
 858         dev->flags &= ~VIRTIO_DEV_READY;
 859
 860         /* Here we are safe to get the last used index */
 861         msg->payload.state.num = vq->last_used_idx;
 862
 863         RTE_LOG(INFO, VHOST_CONFIG,
 864                 "vring base idx:%d file:%d\n", msg->payload.state.index,
 865                 msg->payload.state.num);
 866         /*
 867          * Based on current qemu vhost-user implementation, this message is
 868          * sent and only sent in vhost_vring_stop.
 869          * TODO: cleanup the vring, it isn't usable since here.
 870          */
 871         if (vq->kickfd >= 0)
 872                 close(vq->kickfd);
 873
 874         vq->kickfd = VIRTIO_UNINITIALIZED_EVENTFD;
 875
 876         if (dev->dequeue_zero_copy)
 877                 free_zmbufs(vq);
 878         rte_free(vq->shadow_used_ring);
 879         vq->shadow_used_ring = NULL;
 880
 881         rte_free(vq->batch_copy_elems);
 882         vq->batch_copy_elems = NULL;
 883
 884         return 0;
 885 }
 886
 887 /*
 888  * when virtio queues are ready to work, qemu will send us to
 889  * enable the virtio queue pair.
 890  */
 891 static int
 892 vhost_user_set_vring_enable(struct virtio_net *dev,
 893                             VhostUserMsg *msg)
 894 {
 895         int enable = (int)msg->payload.state.num;
 896
 897         RTE_LOG(INFO, VHOST_CONFIG,
 898                 "set queue enable: %d to qp idx: %d\n",
 899                 enable, msg->payload.state.index);
 900
 901         if (dev->notify_ops->vring_state_changed)
 902                 dev->notify_ops->vring_state_changed(dev->vid,
 903                                 msg->payload.state.index, enable);
 904
 905         dev->virtqueue[msg->payload.state.index]->enabled = enable;
 906
 907         return 0;
 908 }
 909
 910 static void
 911 vhost_user_get_protocol_features(struct virtio_net *dev,
 912                                  struct VhostUserMsg *msg)
 913 {
 914         uint64_t features, protocol_features = VHOST_USER_PROTOCOL_FEATURES;
 915
 916         rte_vhost_driver_get_features(dev->ifname, &features);
 917
 918         /*
 919          * REPLY_ACK protocol feature is only mandatory for now
 920          * for IOMMU feature. If IOMMU is explicitly disabled by the
 921          * application, disable also REPLY_ACK feature for older buggy
 922          * Qemu versions (from v2.7.0 to v2.9.0).
 923          */
 924         if (!(features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)))
 925                 protocol_features &= ~(1ULL << VHOST_USER_PROTOCOL_F_REPLY_ACK);
 926
 927         msg->payload.u64 = protocol_features;
 928         msg->size = sizeof(msg->payload.u64);
 929 }
 930
 931 static void
 932 vhost_user_set_protocol_features(struct virtio_net *dev,
 933                                  uint64_t protocol_features)
 934 {
 935         if (protocol_features & ~VHOST_USER_PROTOCOL_FEATURES)
 936                 return;
 937
 938         dev->protocol_features = protocol_features;
 939 }
 940
 941 static int
 942 vhost_user_set_log_base(struct virtio_net *dev, struct VhostUserMsg *msg)
 943 {
 944         int fd = msg->fds[0];
 945         uint64_t size, off;
 946         void *addr;
 947
 948         if (fd < 0) {
 949                 RTE_LOG(ERR, VHOST_CONFIG, "invalid log fd: %d\n", fd);
 950                 return -1;
 951         }
 952
 953         if (msg->size != sizeof(VhostUserLog)) {
 954                 RTE_LOG(ERR, VHOST_CONFIG,
 955                         "invalid log base msg size: %"PRId32" != %d\n",
 956                         msg->size, (int)sizeof(VhostUserLog));
 957                 return -1;
 958         }
 959
 960         size = msg->payload.log.mmap_size;
 961         off  = msg->payload.log.mmap_offset;
 962         RTE_LOG(INFO, VHOST_CONFIG,
 963                 "log mmap size: %"PRId64", offset: %"PRId64"\n",
 964                 size, off);
 965
 966         /*
 967          * mmap from 0 to workaround a hugepage mmap bug: mmap will
 968          * fail when offset is not page size aligned.
 969          */
 970         addr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
 971         close(fd);
 972         if (addr == MAP_FAILED) {
 973                 RTE_LOG(ERR, VHOST_CONFIG, "mmap log base failed!\n");
 974                 return -1;
 975         }
 976
 977         /*
 978          * Free previously mapped log memory on occasionally
 979          * multiple VHOST_USER_SET_LOG_BASE.
 980          */
 981         if (dev->log_addr) {
 982                 munmap((void *)(uintptr_t)dev->log_addr, dev->log_size);
 983         }
 984         dev->log_addr = (uint64_t)(uintptr_t)addr;
 985         dev->log_base = dev->log_addr + off;
 986         dev->log_size = size;
 987
 988         return 0;
 989 }
 990
 991 /*
 992  * An rarp packet is constructed and broadcasted to notify switches about
 993  * the new location of the migrated VM, so that packets from outside will
 994  * not be lost after migration.
 995  *
 996  * However, we don't actually "send" a rarp packet here, instead, we set
 997  * a flag 'broadcast_rarp' to let rte_vhost_dequeue_burst() inject it.
 998  */
 999 static int
1000 vhost_user_send_rarp(struct virtio_net *dev, struct VhostUserMsg *msg)
1001 {
1002         uint8_t *mac = (uint8_t *)&msg->payload.u64;
1003
1004         RTE_LOG(DEBUG, VHOST_CONFIG,
1005                 ":: mac: %02x:%02x:%02x:%02x:%02x:%02x\n",
1006                 mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
1007         memcpy(dev->mac.addr_bytes, mac, 6);
1008
1009         /*
1010          * Set the flag to inject a RARP broadcast packet at
1011          * rte_vhost_dequeue_burst().
1012          *
1013          * rte_smp_wmb() is for making sure the mac is copied
1014          * before the flag is set.
1015          */
1016         rte_smp_wmb();
1017         rte_atomic16_set(&dev->broadcast_rarp, 1);
1018
1019         return 0;
1020 }
1021
1022 static int
1023 vhost_user_net_set_mtu(struct virtio_net *dev, struct VhostUserMsg *msg)
1024 {
1025         if (msg->payload.u64 < VIRTIO_MIN_MTU ||
1026                         msg->payload.u64 > VIRTIO_MAX_MTU) {
1027                 RTE_LOG(ERR, VHOST_CONFIG, "Invalid MTU size (%"PRIu64")\n",
1028                                 msg->payload.u64);
1029
1030                 return -1;
1031         }
1032
1033         dev->mtu = msg->payload.u64;
1034
1035         return 0;
1036 }
1037
1038 static int
1039 vhost_user_set_req_fd(struct virtio_net *dev, struct VhostUserMsg *msg)
1040 {
1041         int fd = msg->fds[0];
1042
1043         if (fd < 0) {
1044                 RTE_LOG(ERR, VHOST_CONFIG,
1045                                 "Invalid file descriptor for slave channel (%d)\n",
1046                                 fd);
1047                 return -1;
1048         }
1049
1050         dev->slave_req_fd = fd;
1051
1052         return 0;
1053 }
1054
1055 static int
1056 is_vring_iotlb_update(struct vhost_virtqueue *vq, struct vhost_iotlb_msg *imsg)
1057 {
1058         struct vhost_vring_addr *ra;
1059         uint64_t start, end;
1060
1061         start = imsg->iova;
1062         end = start + imsg->size;
1063
1064         ra = &vq->ring_addrs;
1065         if (ra->desc_user_addr >= start && ra->desc_user_addr < end)
1066                 return 1;
1067         if (ra->avail_user_addr >= start && ra->avail_user_addr < end)
1068                 return 1;
1069         if (ra->used_user_addr >= start && ra->used_user_addr < end)
1070                 return 1;
1071
1072         return 0;
1073 }
1074
1075 static int
1076 is_vring_iotlb_invalidate(struct vhost_virtqueue *vq,
1077                                 struct vhost_iotlb_msg *imsg)
1078 {
1079         uint64_t istart, iend, vstart, vend;
1080
1081         istart = imsg->iova;
1082         iend = istart + imsg->size - 1;
1083
1084         vstart = (uintptr_t)vq->desc;
1085         vend = vstart + sizeof(struct vring_desc) * vq->size - 1;
1086         if (vstart <= iend && istart <= vend)
1087                 return 1;
1088
1089         vstart = (uintptr_t)vq->avail;
1090         vend = vstart + sizeof(struct vring_avail);
1091         vend += sizeof(uint16_t) * vq->size - 1;
1092         if (vstart <= iend && istart <= vend)
1093                 return 1;
1094
1095         vstart = (uintptr_t)vq->used;
1096         vend = vstart + sizeof(struct vring_used);
1097         vend += sizeof(struct vring_used_elem) * vq->size - 1;
1098         if (vstart <= iend && istart <= vend)
1099                 return 1;
1100
1101         return 0;
1102 }
1103
1104 static int
1105 vhost_user_iotlb_msg(struct virtio_net **pdev, struct VhostUserMsg *msg)
1106 {
1107         struct virtio_net *dev = *pdev;
1108         struct vhost_iotlb_msg *imsg = &msg->payload.iotlb;
1109         uint16_t i;
1110         uint64_t vva, len;
1111
1112         switch (imsg->type) {
1113         case VHOST_IOTLB_UPDATE:
1114                 len = imsg->size;
1115                 vva = qva_to_vva(dev, imsg->uaddr, &len);
1116                 if (!vva)
1117                         return -1;
1118
1119                 for (i = 0; i < dev->nr_vring; i++) {
1120                         struct vhost_virtqueue *vq = dev->virtqueue[i];
1121
1122                         vhost_user_iotlb_cache_insert(vq, imsg->iova, vva,
1123                                         len, imsg->perm);
1124
1125                         if (is_vring_iotlb_update(vq, imsg))
1126                                 *pdev = dev = translate_ring_addresses(dev, i);
1127                 }
1128                 break;
1129         case VHOST_IOTLB_INVALIDATE:
1130                 for (i = 0; i < dev->nr_vring; i++) {
1131                         struct vhost_virtqueue *vq = dev->virtqueue[i];
1132
1133                         vhost_user_iotlb_cache_remove(vq, imsg->iova,
1134                                         imsg->size);
1135
1136                         if (is_vring_iotlb_invalidate(vq, imsg))
1137                                 vring_invalidate(dev, vq);
1138                 }
1139                 break;
1140         default:
1141                 RTE_LOG(ERR, VHOST_CONFIG, "Invalid IOTLB message type (%d)\n",
1142                                 imsg->type);
1143                 return -1;
1144         }
1145
1146         return 0;
1147 }
1148
1149 /* return bytes# of read on success or negative val on failure. */
1150 static int
1151 read_vhost_message(int sockfd, struct VhostUserMsg *msg)
1152 {
1153         int ret;
1154
1155         ret = read_fd_message(sockfd, (char *)msg, VHOST_USER_HDR_SIZE,
1156                 msg->fds, VHOST_MEMORY_MAX_NREGIONS);
1157         if (ret <= 0)
1158                 return ret;
1159
1160         if (msg && msg->size) {
1161                 if (msg->size > sizeof(msg->payload)) {
1162                         RTE_LOG(ERR, VHOST_CONFIG,
1163                                 "invalid msg size: %d\n", msg->size);
1164                         return -1;
1165                 }
1166                 ret = read(sockfd, &msg->payload, msg->size);
1167                 if (ret <= 0)
1168                         return ret;
1169                 if (ret != (int)msg->size) {
1170                         RTE_LOG(ERR, VHOST_CONFIG,
1171                                 "read control message failed\n");
1172                         return -1;
1173                 }
1174         }
1175
1176         return ret;
1177 }
1178
1179 static int
1180 send_vhost_message(int sockfd, struct VhostUserMsg *msg)
1181 {
1182         if (!msg)
1183                 return 0;
1184
1185         return send_fd_message(sockfd, (char *)msg,
1186                 VHOST_USER_HDR_SIZE + msg->size, NULL, 0);
1187 }
1188
1189 static int
1190 send_vhost_reply(int sockfd, struct VhostUserMsg *msg)
1191 {
1192         if (!msg)
1193                 return 0;
1194
1195         msg->flags &= ~VHOST_USER_VERSION_MASK;
1196         msg->flags &= ~VHOST_USER_NEED_REPLY;
1197         msg->flags |= VHOST_USER_VERSION;
1198         msg->flags |= VHOST_USER_REPLY_MASK;
1199
1200         return send_vhost_message(sockfd, msg);
1201 }
1202
1203 /*
1204  * Allocate a queue pair if it hasn't been allocated yet
1205  */
1206 static int
1207 vhost_user_check_and_alloc_queue_pair(struct virtio_net *dev, VhostUserMsg *msg)
1208 {
1209         uint16_t vring_idx;
1210
1211         switch (msg->request.master) {
1212         case VHOST_USER_SET_VRING_KICK:
1213         case VHOST_USER_SET_VRING_CALL:
1214         case VHOST_USER_SET_VRING_ERR:
1215                 vring_idx = msg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
1216                 break;
1217         case VHOST_USER_SET_VRING_NUM:
1218         case VHOST_USER_SET_VRING_BASE:
1219         case VHOST_USER_SET_VRING_ENABLE:
1220                 vring_idx = msg->payload.state.index;
1221                 break;
1222         case VHOST_USER_SET_VRING_ADDR:
1223                 vring_idx = msg->payload.addr.index;
1224                 break;
1225         default:
1226                 return 0;
1227         }
1228
1229         if (vring_idx >= VHOST_MAX_VRING) {
1230                 RTE_LOG(ERR, VHOST_CONFIG,
1231                         "invalid vring index: %u\n", vring_idx);
1232                 return -1;
1233         }
1234
1235         if (dev->virtqueue[vring_idx])
1236                 return 0;
1237
1238         return alloc_vring_queue(dev, vring_idx);
1239 }
1240
1241 static void
1242 vhost_user_lock_all_queue_pairs(struct virtio_net *dev)
1243 {
1244         unsigned int i = 0;
1245         unsigned int vq_num = 0;
1246
1247         while (vq_num < dev->nr_vring) {
1248                 struct vhost_virtqueue *vq = dev->virtqueue[i];
1249
1250                 if (vq) {
1251                         rte_spinlock_lock(&vq->access_lock);
1252                         vq_num++;
1253                 }
1254                 i++;
1255         }
1256 }
1257
1258 static void
1259 vhost_user_unlock_all_queue_pairs(struct virtio_net *dev)
1260 {
1261         unsigned int i = 0;
1262         unsigned int vq_num = 0;
1263
1264         while (vq_num < dev->nr_vring) {
1265                 struct vhost_virtqueue *vq = dev->virtqueue[i];
1266
1267                 if (vq) {
1268                         rte_spinlock_unlock(&vq->access_lock);
1269                         vq_num++;
1270                 }
1271                 i++;
1272         }
1273 }
1274
1275 int
1276 vhost_user_msg_handler(int vid, int fd)
1277 {
1278         struct virtio_net *dev;
1279         struct VhostUserMsg msg;
1280         int ret;
1281         int unlock_required = 0;
1282
1283         dev = get_device(vid);
1284         if (dev == NULL)
1285                 return -1;
1286
1287         if (!dev->notify_ops) {
1288                 dev->notify_ops = vhost_driver_callback_get(dev->ifname);
1289                 if (!dev->notify_ops) {
1290                         RTE_LOG(ERR, VHOST_CONFIG,
1291                                 "failed to get callback ops for driver %s\n",
1292                                 dev->ifname);
1293                         return -1;
1294                 }
1295         }
1296
1297         ret = read_vhost_message(fd, &msg);
1298         if (ret <= 0 || msg.request.master >= VHOST_USER_MAX) {
1299                 if (ret < 0)
1300                         RTE_LOG(ERR, VHOST_CONFIG,
1301                                 "vhost read message failed\n");
1302                 else if (ret == 0)
1303                         RTE_LOG(INFO, VHOST_CONFIG,
1304                                 "vhost peer closed\n");
1305                 else
1306                         RTE_LOG(ERR, VHOST_CONFIG,
1307                                 "vhost read incorrect message\n");
1308
1309                 return -1;
1310         }
1311
1312         ret = 0;
1313         if (msg.request.master != VHOST_USER_IOTLB_MSG)
1314                 RTE_LOG(INFO, VHOST_CONFIG, "read message %s\n",
1315                         vhost_message_str[msg.request.master]);
1316         else
1317                 RTE_LOG(DEBUG, VHOST_CONFIG, "read message %s\n",
1318                         vhost_message_str[msg.request.master]);
1319
1320         ret = vhost_user_check_and_alloc_queue_pair(dev, &msg);
1321         if (ret < 0) {
1322                 RTE_LOG(ERR, VHOST_CONFIG,
1323                         "failed to alloc queue\n");
1324                 return -1;
1325         }
1326
1327         /*
1328          * Note: we don't lock all queues on VHOST_USER_GET_VRING_BASE,
1329          * since it is sent when virtio stops and device is destroyed.
1330          * destroy_device waits for queues to be inactive, so it is safe.
1331          * Otherwise taking the access_lock would cause a dead lock.
1332          */
1333         switch (msg.request.master) {
1334         case VHOST_USER_SET_FEATURES:
1335         case VHOST_USER_SET_PROTOCOL_FEATURES:
1336         case VHOST_USER_SET_OWNER:
1337         case VHOST_USER_RESET_OWNER:
1338         case VHOST_USER_SET_MEM_TABLE:
1339         case VHOST_USER_SET_LOG_BASE:
1340         case VHOST_USER_SET_LOG_FD:
1341         case VHOST_USER_SET_VRING_NUM:
1342         case VHOST_USER_SET_VRING_ADDR:
1343         case VHOST_USER_SET_VRING_BASE:
1344         case VHOST_USER_SET_VRING_KICK:
1345         case VHOST_USER_SET_VRING_CALL:
1346         case VHOST_USER_SET_VRING_ERR:
1347         case VHOST_USER_SET_VRING_ENABLE:
1348         case VHOST_USER_SEND_RARP:
1349         case VHOST_USER_NET_SET_MTU:
1350         case VHOST_USER_SET_SLAVE_REQ_FD:
1351                 vhost_user_lock_all_queue_pairs(dev);
1352                 unlock_required = 1;
1353                 break;
1354         default:
1355                 break;
1356
1357         }
1358
1359         switch (msg.request.master) {
1360         case VHOST_USER_GET_FEATURES:
1361                 msg.payload.u64 = vhost_user_get_features(dev);
1362                 msg.size = sizeof(msg.payload.u64);
1363                 send_vhost_reply(fd, &msg);
1364                 break;
1365         case VHOST_USER_SET_FEATURES:
1366                 vhost_user_set_features(dev, msg.payload.u64);
1367                 break;
1368
1369         case VHOST_USER_GET_PROTOCOL_FEATURES:
1370                 vhost_user_get_protocol_features(dev, &msg);
1371                 send_vhost_reply(fd, &msg);
1372                 break;
1373         case VHOST_USER_SET_PROTOCOL_FEATURES:
1374                 vhost_user_set_protocol_features(dev, msg.payload.u64);
1375                 break;
1376
1377         case VHOST_USER_SET_OWNER:
1378                 vhost_user_set_owner();
1379                 break;
1380         case VHOST_USER_RESET_OWNER:
1381                 vhost_user_reset_owner(dev);
1382                 break;
1383
1384         case VHOST_USER_SET_MEM_TABLE:
1385                 ret = vhost_user_set_mem_table(dev, &msg);
1386                 break;
1387
1388         case VHOST_USER_SET_LOG_BASE:
1389                 vhost_user_set_log_base(dev, &msg);
1390
1391                 /* it needs a reply */
1392                 msg.size = sizeof(msg.payload.u64);
1393                 send_vhost_reply(fd, &msg);
1394                 break;
1395         case VHOST_USER_SET_LOG_FD:
1396                 close(msg.fds[0]);
1397                 RTE_LOG(INFO, VHOST_CONFIG, "not implemented.\n");
1398                 break;
1399
1400         case VHOST_USER_SET_VRING_NUM:
1401                 vhost_user_set_vring_num(dev, &msg);
1402                 break;
1403         case VHOST_USER_SET_VRING_ADDR:
1404                 vhost_user_set_vring_addr(&dev, &msg);
1405                 break;
1406         case VHOST_USER_SET_VRING_BASE:
1407                 vhost_user_set_vring_base(dev, &msg);
1408                 break;
1409
1410         case VHOST_USER_GET_VRING_BASE:
1411                 vhost_user_get_vring_base(dev, &msg);
1412                 msg.size = sizeof(msg.payload.state);
1413                 send_vhost_reply(fd, &msg);
1414                 break;
1415
1416         case VHOST_USER_SET_VRING_KICK:
1417                 vhost_user_set_vring_kick(&dev, &msg);
1418                 break;
1419         case VHOST_USER_SET_VRING_CALL:
1420                 vhost_user_set_vring_call(dev, &msg);
1421                 break;
1422
1423         case VHOST_USER_SET_VRING_ERR:
1424                 if (!(msg.payload.u64 & VHOST_USER_VRING_NOFD_MASK))
1425                         close(msg.fds[0]);
1426                 RTE_LOG(INFO, VHOST_CONFIG, "not implemented\n");
1427                 break;
1428
1429         case VHOST_USER_GET_QUEUE_NUM:
1430                 msg.payload.u64 = VHOST_MAX_QUEUE_PAIRS;
1431                 msg.size = sizeof(msg.payload.u64);
1432                 send_vhost_reply(fd, &msg);
1433                 break;
1434
1435         case VHOST_USER_SET_VRING_ENABLE:
1436                 vhost_user_set_vring_enable(dev, &msg);
1437                 break;
1438         case VHOST_USER_SEND_RARP:
1439                 vhost_user_send_rarp(dev, &msg);
1440                 break;
1441
1442         case VHOST_USER_NET_SET_MTU:
1443                 ret = vhost_user_net_set_mtu(dev, &msg);
1444                 break;
1445
1446         case VHOST_USER_SET_SLAVE_REQ_FD:
1447                 ret = vhost_user_set_req_fd(dev, &msg);
1448                 break;
1449
1450         case VHOST_USER_IOTLB_MSG:
1451                 ret = vhost_user_iotlb_msg(&dev, &msg);
1452                 break;
1453
1454         default:
1455                 ret = -1;
1456                 break;
1457
1458         }
1459
1460         if (unlock_required)
1461                 vhost_user_unlock_all_queue_pairs(dev);
1462
1463         if (msg.flags & VHOST_USER_NEED_REPLY) {
1464                 msg.payload.u64 = !!ret;
1465                 msg.size = sizeof(msg.payload.u64);
1466                 send_vhost_reply(fd, &msg);
1467         }
1468
1469         if (!(dev->flags & VIRTIO_DEV_RUNNING) && virtio_is_ready(dev)) {
1470                 dev->flags |= VIRTIO_DEV_READY;
1471
1472                 if (!(dev->flags & VIRTIO_DEV_RUNNING)) {
1473                         if (dev->dequeue_zero_copy) {
1474                                 RTE_LOG(INFO, VHOST_CONFIG,
1475                                                 "dequeue zero copy is enabled\n");
1476                         }
1477
1478                         if (dev->notify_ops->new_device(dev->vid) == 0)
1479                                 dev->flags |= VIRTIO_DEV_RUNNING;
1480                 }
1481         }
1482
1483         return 0;
1484 }
1485
1486 int
1487 vhost_user_iotlb_miss(struct virtio_net *dev, uint64_t iova, uint8_t perm)
1488 {
1489         int ret;
1490         struct VhostUserMsg msg = {
1491                 .request.slave = VHOST_USER_SLAVE_IOTLB_MSG,
1492                 .flags = VHOST_USER_VERSION,
1493                 .size = sizeof(msg.payload.iotlb),
1494                 .payload.iotlb = {
1495                         .iova = iova,
1496                         .perm = perm,
1497                         .type = VHOST_IOTLB_MISS,
1498                 },
1499         };
1500
1501         ret = send_vhost_message(dev->slave_req_fd, &msg);
1502         if (ret < 0) {
1503                 RTE_LOG(ERR, VHOST_CONFIG,
1504                                 "Failed to send IOTLB miss message (%d)\n",
1505                                 ret);
1506                 return ret;
1507         }
1508
1509         return 0;
1510 }