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 "vhost.h"
  52 #include "vhost_user.h"
  53
  54 static const char *vhost_message_str[VHOST_USER_MAX] = {
  55         [VHOST_USER_NONE] = "VHOST_USER_NONE",
  56         [VHOST_USER_GET_FEATURES] = "VHOST_USER_GET_FEATURES",
  57         [VHOST_USER_SET_FEATURES] = "VHOST_USER_SET_FEATURES",
  58         [VHOST_USER_SET_OWNER] = "VHOST_USER_SET_OWNER",
  59         [VHOST_USER_RESET_OWNER] = "VHOST_USER_RESET_OWNER",
  60         [VHOST_USER_SET_MEM_TABLE] = "VHOST_USER_SET_MEM_TABLE",
  61         [VHOST_USER_SET_LOG_BASE] = "VHOST_USER_SET_LOG_BASE",
  62         [VHOST_USER_SET_LOG_FD] = "VHOST_USER_SET_LOG_FD",
  63         [VHOST_USER_SET_VRING_NUM] = "VHOST_USER_SET_VRING_NUM",
  64         [VHOST_USER_SET_VRING_ADDR] = "VHOST_USER_SET_VRING_ADDR",
  65         [VHOST_USER_SET_VRING_BASE] = "VHOST_USER_SET_VRING_BASE",
  66         [VHOST_USER_GET_VRING_BASE] = "VHOST_USER_GET_VRING_BASE",
  67         [VHOST_USER_SET_VRING_KICK] = "VHOST_USER_SET_VRING_KICK",
  68         [VHOST_USER_SET_VRING_CALL] = "VHOST_USER_SET_VRING_CALL",
  69         [VHOST_USER_SET_VRING_ERR]  = "VHOST_USER_SET_VRING_ERR",
  70         [VHOST_USER_GET_PROTOCOL_FEATURES]  = "VHOST_USER_GET_PROTOCOL_FEATURES",
  71         [VHOST_USER_SET_PROTOCOL_FEATURES]  = "VHOST_USER_SET_PROTOCOL_FEATURES",
  72         [VHOST_USER_GET_QUEUE_NUM]  = "VHOST_USER_GET_QUEUE_NUM",
  73         [VHOST_USER_SET_VRING_ENABLE]  = "VHOST_USER_SET_VRING_ENABLE",
  74         [VHOST_USER_SEND_RARP]  = "VHOST_USER_SEND_RARP",
  75 };
  76
  77 static uint64_t
  78 get_blk_size(int fd)
  79 {
  80         struct stat stat;
  81         int ret;
  82
  83         ret = fstat(fd, &stat);
  84         return ret == -1 ? (uint64_t)-1 : (uint64_t)stat.st_blksize;
  85 }
  86
  87 static void
  88 free_mem_region(struct virtio_net *dev)
  89 {
  90         uint32_t i;
  91         struct virtio_memory_region *reg;
  92
  93         if (!dev || !dev->mem)
  94                 return;
  95
  96         for (i = 0; i < dev->mem->nregions; i++) {
  97                 reg = &dev->mem->regions[i];
  98                 if (reg->host_user_addr) {
  99                         munmap(reg->mmap_addr, reg->mmap_size);
 100                         close(reg->fd);
 101                 }
 102         }
 103 }
 104
 105 void
 106 vhost_backend_cleanup(struct virtio_net *dev)
 107 {
 108         if (dev->mem) {
 109                 free_mem_region(dev);
 110                 rte_free(dev->mem);
 111                 dev->mem = NULL;
 112         }
 113         if (dev->log_addr) {
 114                 munmap((void *)(uintptr_t)dev->log_addr, dev->log_size);
 115                 dev->log_addr = 0;
 116         }
 117 }
 118
 119 /*
 120  * This function just returns success at the moment unless
 121  * the device hasn't been initialised.
 122  */
 123 static int
 124 vhost_user_set_owner(void)
 125 {
 126         return 0;
 127 }
 128
 129 static int
 130 vhost_user_reset_owner(struct virtio_net *dev)
 131 {
 132         if (dev->flags & VIRTIO_DEV_RUNNING) {
 133                 dev->flags &= ~VIRTIO_DEV_RUNNING;
 134                 notify_ops->destroy_device(dev->vid);
 135         }
 136
 137         cleanup_device(dev, 0);
 138         reset_device(dev);
 139         return 0;
 140 }
 141
 142 /*
 143  * The features that we support are requested.
 144  */
 145 static uint64_t
 146 vhost_user_get_features(void)
 147 {
 148         return VHOST_FEATURES;
 149 }
 150
 151 /*
 152  * We receive the negotiated features supported by us and the virtio device.
 153  */
 154 static int
 155 vhost_user_set_features(struct virtio_net *dev, uint64_t features)
 156 {
 157         if (features & ~VHOST_FEATURES)
 158                 return -1;
 159
 160         dev->features = features;
 161         if (dev->features &
 162                 ((1 << VIRTIO_NET_F_MRG_RXBUF) | (1ULL << VIRTIO_F_VERSION_1))) {
 163                 dev->vhost_hlen = sizeof(struct virtio_net_hdr_mrg_rxbuf);
 164         } else {
 165                 dev->vhost_hlen = sizeof(struct virtio_net_hdr);
 166         }
 167         LOG_DEBUG(VHOST_CONFIG,
 168                 "(%d) mergeable RX buffers %s, virtio 1 %s\n",
 169                 dev->vid,
 170                 (dev->features & (1 << VIRTIO_NET_F_MRG_RXBUF)) ? "on" : "off",
 171                 (dev->features & (1ULL << VIRTIO_F_VERSION_1)) ? "on" : "off");
 172
 173         return 0;
 174 }
 175
 176 /*
 177  * The virtio device sends us the size of the descriptor ring.
 178  */
 179 static int
 180 vhost_user_set_vring_num(struct virtio_net *dev,
 181                          struct vhost_vring_state *state)
 182 {
 183         struct vhost_virtqueue *vq = dev->virtqueue[state->index];
 184
 185         vq->size = state->num;
 186
 187         if (dev->dequeue_zero_copy) {
 188                 vq->nr_zmbuf = 0;
 189                 vq->last_zmbuf_idx = 0;
 190                 vq->zmbuf_size = vq->size;
 191                 vq->zmbufs = rte_zmalloc(NULL, vq->zmbuf_size *
 192                                          sizeof(struct zcopy_mbuf), 0);
 193                 if (vq->zmbufs == NULL) {
 194                         RTE_LOG(WARNING, VHOST_CONFIG,
 195                                 "failed to allocate mem for zero copy; "
 196                                 "zero copy is force disabled\n");
 197                         dev->dequeue_zero_copy = 0;
 198                 }
 199         }
 200
 201         vq->shadow_used_ring = rte_malloc(NULL,
 202                                 vq->size * sizeof(struct vring_used_elem),
 203                                 RTE_CACHE_LINE_SIZE);
 204         if (!vq->shadow_used_ring) {
 205                 RTE_LOG(ERR, VHOST_CONFIG,
 206                         "failed to allocate memory for shadow used ring.\n");
 207                 return -1;
 208         }
 209
 210         return 0;
 211 }
 212
 213 /*
 214  * Reallocate virtio_dev and vhost_virtqueue data structure to make them on the
 215  * same numa node as the memory of vring descriptor.
 216  */
 217 #ifdef RTE_LIBRTE_VHOST_NUMA
 218 static struct virtio_net*
 219 numa_realloc(struct virtio_net *dev, int index)
 220 {
 221         int oldnode, newnode;
 222         struct virtio_net *old_dev;
 223         struct vhost_virtqueue *old_vq, *vq;
 224         int ret;
 225
 226         /*
 227          * vq is allocated on pairs, we should try to do realloc
 228          * on first queue of one queue pair only.
 229          */
 230         if (index % VIRTIO_QNUM != 0)
 231                 return dev;
 232
 233         old_dev = dev;
 234         vq = old_vq = dev->virtqueue[index];
 235
 236         ret = get_mempolicy(&newnode, NULL, 0, old_vq->desc,
 237                             MPOL_F_NODE | MPOL_F_ADDR);
 238
 239         /* check if we need to reallocate vq */
 240         ret |= get_mempolicy(&oldnode, NULL, 0, old_vq,
 241                              MPOL_F_NODE | MPOL_F_ADDR);
 242         if (ret) {
 243                 RTE_LOG(ERR, VHOST_CONFIG,
 244                         "Unable to get vq numa information.\n");
 245                 return dev;
 246         }
 247         if (oldnode != newnode) {
 248                 RTE_LOG(INFO, VHOST_CONFIG,
 249                         "reallocate vq from %d to %d node\n", oldnode, newnode);
 250                 vq = rte_malloc_socket(NULL, sizeof(*vq) * VIRTIO_QNUM, 0,
 251                                        newnode);
 252                 if (!vq)
 253                         return dev;
 254
 255                 memcpy(vq, old_vq, sizeof(*vq) * VIRTIO_QNUM);
 256                 rte_free(old_vq);
 257         }
 258
 259         /* check if we need to reallocate dev */
 260         ret = get_mempolicy(&oldnode, NULL, 0, old_dev,
 261                             MPOL_F_NODE | MPOL_F_ADDR);
 262         if (ret) {
 263                 RTE_LOG(ERR, VHOST_CONFIG,
 264                         "Unable to get dev numa information.\n");
 265                 goto out;
 266         }
 267         if (oldnode != newnode) {
 268                 RTE_LOG(INFO, VHOST_CONFIG,
 269                         "reallocate dev from %d to %d node\n",
 270                         oldnode, newnode);
 271                 dev = rte_malloc_socket(NULL, sizeof(*dev), 0, newnode);
 272                 if (!dev) {
 273                         dev = old_dev;
 274                         goto out;
 275                 }
 276
 277                 memcpy(dev, old_dev, sizeof(*dev));
 278                 rte_free(old_dev);
 279         }
 280
 281 out:
 282         dev->virtqueue[index] = vq;
 283         dev->virtqueue[index + 1] = vq + 1;
 284         vhost_devices[dev->vid] = dev;
 285
 286         return dev;
 287 }
 288 #else
 289 static struct virtio_net*
 290 numa_realloc(struct virtio_net *dev, int index __rte_unused)
 291 {
 292         return dev;
 293 }
 294 #endif
 295
 296 /*
 297  * Converts QEMU virtual address to Vhost virtual address. This function is
 298  * used to convert the ring addresses to our address space.
 299  */
 300 static uint64_t
 301 qva_to_vva(struct virtio_net *dev, uint64_t qva)
 302 {
 303         struct virtio_memory_region *reg;
 304         uint32_t i;
 305
 306         /* Find the region where the address lives. */
 307         for (i = 0; i < dev->mem->nregions; i++) {
 308                 reg = &dev->mem->regions[i];
 309
 310                 if (qva >= reg->guest_user_addr &&
 311                     qva <  reg->guest_user_addr + reg->size) {
 312                         return qva - reg->guest_user_addr +
 313                                reg->host_user_addr;
 314                 }
 315         }
 316
 317         return 0;
 318 }
 319
 320 /*
 321  * The virtio device sends us the desc, used and avail ring addresses.
 322  * This function then converts these to our address space.
 323  */
 324 static int
 325 vhost_user_set_vring_addr(struct virtio_net *dev, struct vhost_vring_addr *addr)
 326 {
 327         struct vhost_virtqueue *vq;
 328
 329         if (dev->mem == NULL)
 330                 return -1;
 331
 332         /* addr->index refers to the queue index. The txq 1, rxq is 0. */
 333         vq = dev->virtqueue[addr->index];
 334
 335         /* The addresses are converted from QEMU virtual to Vhost virtual. */
 336         vq->desc = (struct vring_desc *)(uintptr_t)qva_to_vva(dev,
 337                         addr->desc_user_addr);
 338         if (vq->desc == 0) {
 339                 RTE_LOG(ERR, VHOST_CONFIG,
 340                         "(%d) failed to find desc ring address.\n",
 341                         dev->vid);
 342                 return -1;
 343         }
 344
 345         dev = numa_realloc(dev, addr->index);
 346         vq = dev->virtqueue[addr->index];
 347
 348         vq->avail = (struct vring_avail *)(uintptr_t)qva_to_vva(dev,
 349                         addr->avail_user_addr);
 350         if (vq->avail == 0) {
 351                 RTE_LOG(ERR, VHOST_CONFIG,
 352                         "(%d) failed to find avail ring address.\n",
 353                         dev->vid);
 354                 return -1;
 355         }
 356
 357         vq->used = (struct vring_used *)(uintptr_t)qva_to_vva(dev,
 358                         addr->used_user_addr);
 359         if (vq->used == 0) {
 360                 RTE_LOG(ERR, VHOST_CONFIG,
 361                         "(%d) failed to find used ring address.\n",
 362                         dev->vid);
 363                 return -1;
 364         }
 365
 366         if (vq->last_used_idx != vq->used->idx) {
 367                 RTE_LOG(WARNING, VHOST_CONFIG,
 368                         "last_used_idx (%u) and vq->used->idx (%u) mismatches; "
 369                         "some packets maybe resent for Tx and dropped for Rx\n",
 370                         vq->last_used_idx, vq->used->idx);
 371                 vq->last_used_idx  = vq->used->idx;
 372                 vq->last_avail_idx = vq->used->idx;
 373         }
 374
 375         vq->log_guest_addr = addr->log_guest_addr;
 376
 377         LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address desc: %p\n",
 378                         dev->vid, vq->desc);
 379         LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address avail: %p\n",
 380                         dev->vid, vq->avail);
 381         LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address used: %p\n",
 382                         dev->vid, vq->used);
 383         LOG_DEBUG(VHOST_CONFIG, "(%d) log_guest_addr: %" PRIx64 "\n",
 384                         dev->vid, vq->log_guest_addr);
 385
 386         return 0;
 387 }
 388
 389 /*
 390  * The virtio device sends us the available ring last used index.
 391  */
 392 static int
 393 vhost_user_set_vring_base(struct virtio_net *dev,
 394                           struct vhost_vring_state *state)
 395 {
 396         dev->virtqueue[state->index]->last_used_idx  = state->num;
 397         dev->virtqueue[state->index]->last_avail_idx = state->num;
 398
 399         return 0;
 400 }
 401
 402 static void
 403 add_one_guest_page(struct virtio_net *dev, uint64_t guest_phys_addr,
 404                    uint64_t host_phys_addr, uint64_t size)
 405 {
 406         struct guest_page *page, *last_page;
 407
 408         if (dev->nr_guest_pages == dev->max_guest_pages) {
 409                 dev->max_guest_pages *= 2;
 410                 dev->guest_pages = realloc(dev->guest_pages,
 411                                         dev->max_guest_pages * sizeof(*page));
 412         }
 413
 414         if (dev->nr_guest_pages > 0) {
 415                 last_page = &dev->guest_pages[dev->nr_guest_pages - 1];
 416                 /* merge if the two pages are continuous */
 417                 if (host_phys_addr == last_page->host_phys_addr +
 418                                       last_page->size) {
 419                         last_page->size += size;
 420                         return;
 421                 }
 422         }
 423
 424         page = &dev->guest_pages[dev->nr_guest_pages++];
 425         page->guest_phys_addr = guest_phys_addr;
 426         page->host_phys_addr  = host_phys_addr;
 427         page->size = size;
 428 }
 429
 430 static void
 431 add_guest_pages(struct virtio_net *dev, struct virtio_memory_region *reg,
 432                 uint64_t page_size)
 433 {
 434         uint64_t reg_size = reg->size;
 435         uint64_t host_user_addr  = reg->host_user_addr;
 436         uint64_t guest_phys_addr = reg->guest_phys_addr;
 437         uint64_t host_phys_addr;
 438         uint64_t size;
 439
 440         host_phys_addr = rte_mem_virt2phy((void *)(uintptr_t)host_user_addr);
 441         size = page_size - (guest_phys_addr & (page_size - 1));
 442         size = RTE_MIN(size, reg_size);
 443
 444         add_one_guest_page(dev, guest_phys_addr, host_phys_addr, size);
 445         host_user_addr  += size;
 446         guest_phys_addr += size;
 447         reg_size -= size;
 448
 449         while (reg_size > 0) {
 450                 host_phys_addr = rte_mem_virt2phy((void *)(uintptr_t)
 451                                                   host_user_addr);
 452                 add_one_guest_page(dev, guest_phys_addr, host_phys_addr,
 453                                    page_size);
 454
 455                 host_user_addr  += page_size;
 456                 guest_phys_addr += page_size;
 457                 reg_size -= page_size;
 458         }
 459 }
 460
 461 #ifdef RTE_LIBRTE_VHOST_DEBUG
 462 /* TODO: enable it only in debug mode? */
 463 static void
 464 dump_guest_pages(struct virtio_net *dev)
 465 {
 466         uint32_t i;
 467         struct guest_page *page;
 468
 469         for (i = 0; i < dev->nr_guest_pages; i++) {
 470                 page = &dev->guest_pages[i];
 471
 472                 RTE_LOG(INFO, VHOST_CONFIG,
 473                         "guest physical page region %u\n"
 474                         "\t guest_phys_addr: %" PRIx64 "\n"
 475                         "\t host_phys_addr : %" PRIx64 "\n"
 476                         "\t size           : %" PRIx64 "\n",
 477                         i,
 478                         page->guest_phys_addr,
 479                         page->host_phys_addr,
 480                         page->size);
 481         }
 482 }
 483 #else
 484 #define dump_guest_pages(dev)
 485 #endif
 486
 487 static int
 488 vhost_user_set_mem_table(struct virtio_net *dev, struct VhostUserMsg *pmsg)
 489 {
 490         struct VhostUserMemory memory = pmsg->payload.memory;
 491         struct virtio_memory_region *reg;
 492         void *mmap_addr;
 493         uint64_t mmap_size;
 494         uint64_t mmap_offset;
 495         uint64_t alignment;
 496         uint32_t i;
 497         int fd;
 498
 499         /* Remove from the data plane. */
 500         if (dev->flags & VIRTIO_DEV_RUNNING) {
 501                 dev->flags &= ~VIRTIO_DEV_RUNNING;
 502                 notify_ops->destroy_device(dev->vid);
 503         }
 504
 505         if (dev->mem) {
 506                 free_mem_region(dev);
 507                 rte_free(dev->mem);
 508                 dev->mem = NULL;
 509         }
 510
 511         dev->nr_guest_pages = 0;
 512         if (!dev->guest_pages) {
 513                 dev->max_guest_pages = 8;
 514                 dev->guest_pages = malloc(dev->max_guest_pages *
 515                                                 sizeof(struct guest_page));
 516         }
 517
 518         dev->mem = rte_zmalloc("vhost-mem-table", sizeof(struct virtio_memory) +
 519                 sizeof(struct virtio_memory_region) * memory.nregions, 0);
 520         if (dev->mem == NULL) {
 521                 RTE_LOG(ERR, VHOST_CONFIG,
 522                         "(%d) failed to allocate memory for dev->mem\n",
 523                         dev->vid);
 524                 return -1;
 525         }
 526         dev->mem->nregions = memory.nregions;
 527
 528         for (i = 0; i < memory.nregions; i++) {
 529                 fd  = pmsg->fds[i];
 530                 reg = &dev->mem->regions[i];
 531
 532                 reg->guest_phys_addr = memory.regions[i].guest_phys_addr;
 533                 reg->guest_user_addr = memory.regions[i].userspace_addr;
 534                 reg->size            = memory.regions[i].memory_size;
 535                 reg->fd              = fd;
 536
 537                 mmap_offset = memory.regions[i].mmap_offset;
 538                 mmap_size   = reg->size + mmap_offset;
 539
 540                 /* mmap() without flag of MAP_ANONYMOUS, should be called
 541                  * with length argument aligned with hugepagesz at older
 542                  * longterm version Linux, like 2.6.32 and 3.2.72, or
 543                  * mmap() will fail with EINVAL.
 544                  *
 545                  * to avoid failure, make sure in caller to keep length
 546                  * aligned.
 547                  */
 548                 alignment = get_blk_size(fd);
 549                 if (alignment == (uint64_t)-1) {
 550                         RTE_LOG(ERR, VHOST_CONFIG,
 551                                 "couldn't get hugepage size through fstat\n");
 552                         goto err_mmap;
 553                 }
 554                 mmap_size = RTE_ALIGN_CEIL(mmap_size, alignment);
 555
 556                 mmap_addr = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE,
 557                                  MAP_SHARED | MAP_POPULATE, fd, 0);
 558
 559                 if (mmap_addr == MAP_FAILED) {
 560                         RTE_LOG(ERR, VHOST_CONFIG,
 561                                 "mmap region %u failed.\n", i);
 562                         goto err_mmap;
 563                 }
 564
 565                 reg->mmap_addr = mmap_addr;
 566                 reg->mmap_size = mmap_size;
 567                 reg->host_user_addr = (uint64_t)(uintptr_t)mmap_addr +
 568                                       mmap_offset;
 569
 570                 add_guest_pages(dev, reg, alignment);
 571
 572                 RTE_LOG(INFO, VHOST_CONFIG,
 573                         "guest memory region %u, size: 0x%" PRIx64 "\n"
 574                         "\t guest physical addr: 0x%" PRIx64 "\n"
 575                         "\t guest virtual  addr: 0x%" PRIx64 "\n"
 576                         "\t host  virtual  addr: 0x%" PRIx64 "\n"
 577                         "\t mmap addr : 0x%" PRIx64 "\n"
 578                         "\t mmap size : 0x%" PRIx64 "\n"
 579                         "\t mmap align: 0x%" PRIx64 "\n"
 580                         "\t mmap off  : 0x%" PRIx64 "\n",
 581                         i, reg->size,
 582                         reg->guest_phys_addr,
 583                         reg->guest_user_addr,
 584                         reg->host_user_addr,
 585                         (uint64_t)(uintptr_t)mmap_addr,
 586                         mmap_size,
 587                         alignment,
 588                         mmap_offset);
 589         }
 590
 591         dump_guest_pages(dev);
 592
 593         return 0;
 594
 595 err_mmap:
 596         free_mem_region(dev);
 597         rte_free(dev->mem);
 598         dev->mem = NULL;
 599         return -1;
 600 }
 601
 602 static int
 603 vq_is_ready(struct vhost_virtqueue *vq)
 604 {
 605         return vq && vq->desc   &&
 606                vq->kickfd != VIRTIO_UNINITIALIZED_EVENTFD &&
 607                vq->callfd != VIRTIO_UNINITIALIZED_EVENTFD;
 608 }
 609
 610 static int
 611 virtio_is_ready(struct virtio_net *dev)
 612 {
 613         struct vhost_virtqueue *rvq, *tvq;
 614         uint32_t i;
 615
 616         for (i = 0; i < dev->virt_qp_nb; i++) {
 617                 rvq = dev->virtqueue[i * VIRTIO_QNUM + VIRTIO_RXQ];
 618                 tvq = dev->virtqueue[i * VIRTIO_QNUM + VIRTIO_TXQ];
 619
 620                 if (!vq_is_ready(rvq) || !vq_is_ready(tvq)) {
 621                         RTE_LOG(INFO, VHOST_CONFIG,
 622                                 "virtio is not ready for processing.\n");
 623                         return 0;
 624                 }
 625         }
 626
 627         RTE_LOG(INFO, VHOST_CONFIG,
 628                 "virtio is now ready for processing.\n");
 629         return 1;
 630 }
 631
 632 static void
 633 vhost_user_set_vring_call(struct virtio_net *dev, struct VhostUserMsg *pmsg)
 634 {
 635         struct vhost_vring_file file;
 636         struct vhost_virtqueue *vq;
 637         uint32_t cur_qp_idx;
 638
 639         file.index = pmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
 640         if (pmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK)
 641                 file.fd = VIRTIO_INVALID_EVENTFD;
 642         else
 643                 file.fd = pmsg->fds[0];
 644         RTE_LOG(INFO, VHOST_CONFIG,
 645                 "vring call idx:%d file:%d\n", file.index, file.fd);
 646
 647         /*
 648          * FIXME: VHOST_SET_VRING_CALL is the first per-vring message
 649          * we get, so we do vring queue pair allocation here.
 650          */
 651         cur_qp_idx = file.index / VIRTIO_QNUM;
 652         if (cur_qp_idx + 1 > dev->virt_qp_nb) {
 653                 if (alloc_vring_queue_pair(dev, cur_qp_idx) < 0)
 654                         return;
 655         }
 656
 657         vq = dev->virtqueue[file.index];
 658         assert(vq != NULL);
 659
 660         if (vq->callfd >= 0)
 661                 close(vq->callfd);
 662
 663         vq->callfd = file.fd;
 664 }
 665
 666 /*
 667  *  In vhost-user, when we receive kick message, will test whether virtio
 668  *  device is ready for packet processing.
 669  */
 670 static void
 671 vhost_user_set_vring_kick(struct virtio_net *dev, struct VhostUserMsg *pmsg)
 672 {
 673         struct vhost_vring_file file;
 674         struct vhost_virtqueue *vq;
 675
 676         file.index = pmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
 677         if (pmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK)
 678                 file.fd = VIRTIO_INVALID_EVENTFD;
 679         else
 680                 file.fd = pmsg->fds[0];
 681         RTE_LOG(INFO, VHOST_CONFIG,
 682                 "vring kick idx:%d file:%d\n", file.index, file.fd);
 683
 684         vq = dev->virtqueue[file.index];
 685         if (vq->kickfd >= 0)
 686                 close(vq->kickfd);
 687         vq->kickfd = file.fd;
 688
 689         if (virtio_is_ready(dev) && !(dev->flags & VIRTIO_DEV_RUNNING)) {
 690                 if (dev->dequeue_zero_copy) {
 691                         RTE_LOG(INFO, VHOST_CONFIG,
 692                                 "dequeue zero copy is enabled\n");
 693                 }
 694
 695                 if (notify_ops->new_device(dev->vid) == 0)
 696                         dev->flags |= VIRTIO_DEV_RUNNING;
 697         }
 698 }
 699
 700 static void
 701 free_zmbufs(struct vhost_virtqueue *vq)
 702 {
 703         struct zcopy_mbuf *zmbuf, *next;
 704
 705         for (zmbuf = TAILQ_FIRST(&vq->zmbuf_list);
 706              zmbuf != NULL; zmbuf = next) {
 707                 next = TAILQ_NEXT(zmbuf, next);
 708
 709                 rte_pktmbuf_free(zmbuf->mbuf);
 710                 TAILQ_REMOVE(&vq->zmbuf_list, zmbuf, next);
 711         }
 712
 713         rte_free(vq->zmbufs);
 714 }
 715
 716 /*
 717  * when virtio is stopped, qemu will send us the GET_VRING_BASE message.
 718  */
 719 static int
 720 vhost_user_get_vring_base(struct virtio_net *dev,
 721                           struct vhost_vring_state *state)
 722 {
 723         struct vhost_virtqueue *vq = dev->virtqueue[state->index];
 724
 725         /* We have to stop the queue (virtio) if it is running. */
 726         if (dev->flags & VIRTIO_DEV_RUNNING) {
 727                 dev->flags &= ~VIRTIO_DEV_RUNNING;
 728                 notify_ops->destroy_device(dev->vid);
 729         }
 730
 731         /* Here we are safe to get the last used index */
 732         state->num = vq->last_used_idx;
 733
 734         RTE_LOG(INFO, VHOST_CONFIG,
 735                 "vring base idx:%d file:%d\n", state->index, state->num);
 736         /*
 737          * Based on current qemu vhost-user implementation, this message is
 738          * sent and only sent in vhost_vring_stop.
 739          * TODO: cleanup the vring, it isn't usable since here.
 740          */
 741         if (vq->kickfd >= 0)
 742                 close(vq->kickfd);
 743
 744         vq->kickfd = VIRTIO_UNINITIALIZED_EVENTFD;
 745
 746         if (dev->dequeue_zero_copy)
 747                 free_zmbufs(vq);
 748         rte_free(vq->shadow_used_ring);
 749         vq->shadow_used_ring = NULL;
 750
 751         return 0;
 752 }
 753
 754 /*
 755  * when virtio queues are ready to work, qemu will send us to
 756  * enable the virtio queue pair.
 757  */
 758 static int
 759 vhost_user_set_vring_enable(struct virtio_net *dev,
 760                             struct vhost_vring_state *state)
 761 {
 762         int enable = (int)state->num;
 763
 764         RTE_LOG(INFO, VHOST_CONFIG,
 765                 "set queue enable: %d to qp idx: %d\n",
 766                 enable, state->index);
 767
 768         if (notify_ops->vring_state_changed)
 769                 notify_ops->vring_state_changed(dev->vid, state->index, enable);
 770
 771         dev->virtqueue[state->index]->enabled = enable;
 772
 773         return 0;
 774 }
 775
 776 static void
 777 vhost_user_set_protocol_features(struct virtio_net *dev,
 778                                  uint64_t protocol_features)
 779 {
 780         if (protocol_features & ~VHOST_USER_PROTOCOL_FEATURES)
 781                 return;
 782
 783         dev->protocol_features = protocol_features;
 784 }
 785
 786 static int
 787 vhost_user_set_log_base(struct virtio_net *dev, struct VhostUserMsg *msg)
 788 {
 789         int fd = msg->fds[0];
 790         uint64_t size, off;
 791         void *addr;
 792
 793         if (fd < 0) {
 794                 RTE_LOG(ERR, VHOST_CONFIG, "invalid log fd: %d\n", fd);
 795                 return -1;
 796         }
 797
 798         if (msg->size != sizeof(VhostUserLog)) {
 799                 RTE_LOG(ERR, VHOST_CONFIG,
 800                         "invalid log base msg size: %"PRId32" != %d\n",
 801                         msg->size, (int)sizeof(VhostUserLog));
 802                 return -1;
 803         }
 804
 805         size = msg->payload.log.mmap_size;
 806         off  = msg->payload.log.mmap_offset;
 807         RTE_LOG(INFO, VHOST_CONFIG,
 808                 "log mmap size: %"PRId64", offset: %"PRId64"\n",
 809                 size, off);
 810
 811         /*
 812          * mmap from 0 to workaround a hugepage mmap bug: mmap will
 813          * fail when offset is not page size aligned.
 814          */
 815         addr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
 816         close(fd);
 817         if (addr == MAP_FAILED) {
 818                 RTE_LOG(ERR, VHOST_CONFIG, "mmap log base failed!\n");
 819                 return -1;
 820         }
 821
 822         /*
 823          * Free previously mapped log memory on occasionally
 824          * multiple VHOST_USER_SET_LOG_BASE.
 825          */
 826         if (dev->log_addr) {
 827                 munmap((void *)(uintptr_t)dev->log_addr, dev->log_size);
 828         }
 829         dev->log_addr = (uint64_t)(uintptr_t)addr;
 830         dev->log_base = dev->log_addr + off;
 831         dev->log_size = size;
 832
 833         return 0;
 834 }
 835
 836 /*
 837  * An rarp packet is constructed and broadcasted to notify switches about
 838  * the new location of the migrated VM, so that packets from outside will
 839  * not be lost after migration.
 840  *
 841  * However, we don't actually "send" a rarp packet here, instead, we set
 842  * a flag 'broadcast_rarp' to let rte_vhost_dequeue_burst() inject it.
 843  */
 844 static int
 845 vhost_user_send_rarp(struct virtio_net *dev, struct VhostUserMsg *msg)
 846 {
 847         uint8_t *mac = (uint8_t *)&msg->payload.u64;
 848
 849         RTE_LOG(DEBUG, VHOST_CONFIG,
 850                 ":: mac: %02x:%02x:%02x:%02x:%02x:%02x\n",
 851                 mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
 852         memcpy(dev->mac.addr_bytes, mac, 6);
 853
 854         /*
 855          * Set the flag to inject a RARP broadcast packet at
 856          * rte_vhost_dequeue_burst().
 857          *
 858          * rte_smp_wmb() is for making sure the mac is copied
 859          * before the flag is set.
 860          */
 861         rte_smp_wmb();
 862         rte_atomic16_set(&dev->broadcast_rarp, 1);
 863
 864         return 0;
 865 }
 866
 867 /* return bytes# of read on success or negative val on failure. */
 868 static int
 869 read_vhost_message(int sockfd, struct VhostUserMsg *msg)
 870 {
 871         int ret;
 872
 873         ret = read_fd_message(sockfd, (char *)msg, VHOST_USER_HDR_SIZE,
 874                 msg->fds, VHOST_MEMORY_MAX_NREGIONS);
 875         if (ret <= 0)
 876                 return ret;
 877
 878         if (msg && msg->size) {
 879                 if (msg->size > sizeof(msg->payload)) {
 880                         RTE_LOG(ERR, VHOST_CONFIG,
 881                                 "invalid msg size: %d\n", msg->size);
 882                         return -1;
 883                 }
 884                 ret = read(sockfd, &msg->payload, msg->size);
 885                 if (ret <= 0)
 886                         return ret;
 887                 if (ret != (int)msg->size) {
 888                         RTE_LOG(ERR, VHOST_CONFIG,
 889                                 "read control message failed\n");
 890                         return -1;
 891                 }
 892         }
 893
 894         return ret;
 895 }
 896
 897 static int
 898 send_vhost_message(int sockfd, struct VhostUserMsg *msg)
 899 {
 900         int ret;
 901
 902         if (!msg)
 903                 return 0;
 904
 905         msg->flags &= ~VHOST_USER_VERSION_MASK;
 906         msg->flags |= VHOST_USER_VERSION;
 907         msg->flags |= VHOST_USER_REPLY_MASK;
 908
 909         ret = send_fd_message(sockfd, (char *)msg,
 910                 VHOST_USER_HDR_SIZE + msg->size, NULL, 0);
 911
 912         return ret;
 913 }
 914
 915 int
 916 vhost_user_msg_handler(int vid, int fd)
 917 {
 918         struct virtio_net *dev;
 919         struct VhostUserMsg msg;
 920         int ret;
 921
 922         dev = get_device(vid);
 923         if (dev == NULL)
 924                 return -1;
 925
 926         ret = read_vhost_message(fd, &msg);
 927         if (ret <= 0 || msg.request >= VHOST_USER_MAX) {
 928                 if (ret < 0)
 929                         RTE_LOG(ERR, VHOST_CONFIG,
 930                                 "vhost read message failed\n");
 931                 else if (ret == 0)
 932                         RTE_LOG(INFO, VHOST_CONFIG,
 933                                 "vhost peer closed\n");
 934                 else
 935                         RTE_LOG(ERR, VHOST_CONFIG,
 936                                 "vhost read incorrect message\n");
 937
 938                 return -1;
 939         }
 940
 941         RTE_LOG(INFO, VHOST_CONFIG, "read message %s\n",
 942                 vhost_message_str[msg.request]);
 943         switch (msg.request) {
 944         case VHOST_USER_GET_FEATURES:
 945                 msg.payload.u64 = vhost_user_get_features();
 946                 msg.size = sizeof(msg.payload.u64);
 947                 send_vhost_message(fd, &msg);
 948                 break;
 949         case VHOST_USER_SET_FEATURES:
 950                 vhost_user_set_features(dev, msg.payload.u64);
 951                 break;
 952
 953         case VHOST_USER_GET_PROTOCOL_FEATURES:
 954                 msg.payload.u64 = VHOST_USER_PROTOCOL_FEATURES;
 955                 msg.size = sizeof(msg.payload.u64);
 956                 send_vhost_message(fd, &msg);
 957                 break;
 958         case VHOST_USER_SET_PROTOCOL_FEATURES:
 959                 vhost_user_set_protocol_features(dev, msg.payload.u64);
 960                 break;
 961
 962         case VHOST_USER_SET_OWNER:
 963                 vhost_user_set_owner();
 964                 break;
 965         case VHOST_USER_RESET_OWNER:
 966                 vhost_user_reset_owner(dev);
 967                 break;
 968
 969         case VHOST_USER_SET_MEM_TABLE:
 970                 vhost_user_set_mem_table(dev, &msg);
 971                 break;
 972
 973         case VHOST_USER_SET_LOG_BASE:
 974                 vhost_user_set_log_base(dev, &msg);
 975
 976                 /* it needs a reply */
 977                 msg.size = sizeof(msg.payload.u64);
 978                 send_vhost_message(fd, &msg);
 979                 break;
 980         case VHOST_USER_SET_LOG_FD:
 981                 close(msg.fds[0]);
 982                 RTE_LOG(INFO, VHOST_CONFIG, "not implemented.\n");
 983                 break;
 984
 985         case VHOST_USER_SET_VRING_NUM:
 986                 vhost_user_set_vring_num(dev, &msg.payload.state);
 987                 break;
 988         case VHOST_USER_SET_VRING_ADDR:
 989                 vhost_user_set_vring_addr(dev, &msg.payload.addr);
 990                 break;
 991         case VHOST_USER_SET_VRING_BASE:
 992                 vhost_user_set_vring_base(dev, &msg.payload.state);
 993                 break;
 994
 995         case VHOST_USER_GET_VRING_BASE:
 996                 ret = vhost_user_get_vring_base(dev, &msg.payload.state);
 997                 msg.size = sizeof(msg.payload.state);
 998                 send_vhost_message(fd, &msg);
 999                 break;
1000
1001         case VHOST_USER_SET_VRING_KICK:
1002                 vhost_user_set_vring_kick(dev, &msg);
1003                 break;
1004         case VHOST_USER_SET_VRING_CALL:
1005                 vhost_user_set_vring_call(dev, &msg);
1006                 break;
1007
1008         case VHOST_USER_SET_VRING_ERR:
1009                 if (!(msg.payload.u64 & VHOST_USER_VRING_NOFD_MASK))
1010                         close(msg.fds[0]);
1011                 RTE_LOG(INFO, VHOST_CONFIG, "not implemented\n");
1012                 break;
1013
1014         case VHOST_USER_GET_QUEUE_NUM:
1015                 msg.payload.u64 = VHOST_MAX_QUEUE_PAIRS;
1016                 msg.size = sizeof(msg.payload.u64);
1017                 send_vhost_message(fd, &msg);
1018                 break;
1019
1020         case VHOST_USER_SET_VRING_ENABLE:
1021                 vhost_user_set_vring_enable(dev, &msg.payload.state);
1022                 break;
1023         case VHOST_USER_SEND_RARP:
1024                 vhost_user_send_rarp(dev, &msg);
1025                 break;
1026
1027         default:
1028                 break;
1029
1030         }
1031
1032         return 0;
1033 }