1 #include "kvm/virtio-pci-dev.h" 2 #include "kvm/virtio-net.h" 3 #include "kvm/virtio.h" 4 #include "kvm/mutex.h" 5 #include "kvm/util.h" 6 #include "kvm/kvm.h" 7 #include "kvm/irq.h" 8 #include "kvm/uip.h" 9 #include "kvm/guest_compat.h" 10 #include "kvm/iovec.h" 11 12 #include <linux/vhost.h> 13 #include <linux/virtio_net.h> 14 #include <linux/if_tun.h> 15 #include <linux/types.h> 16 17 #include <arpa/inet.h> 18 #include <net/if.h> 19 20 #include <unistd.h> 21 #include <fcntl.h> 22 23 #include <sys/socket.h> 24 #include <sys/ioctl.h> 25 #include <sys/types.h> 26 #include <sys/wait.h> 27 #include <sys/eventfd.h> 28 29 #define VIRTIO_NET_QUEUE_SIZE 256 30 #define VIRTIO_NET_NUM_QUEUES 8 31 32 struct net_dev; 33 34 struct net_dev_operations { 35 int (*rx)(struct iovec *iov, u16 in, struct net_dev *ndev); 36 int (*tx)(struct iovec *iov, u16 in, struct net_dev *ndev); 37 }; 38 39 struct net_dev { 40 struct mutex mutex; 41 struct virtio_device vdev; 42 struct list_head list; 43 44 struct virt_queue vqs[VIRTIO_NET_NUM_QUEUES * 2 + 1]; 45 struct virtio_net_config config; 46 u32 features, rx_vqs, tx_vqs, queue_pairs; 47 48 pthread_t io_thread[VIRTIO_NET_NUM_QUEUES * 2 + 1]; 49 struct mutex io_lock[VIRTIO_NET_NUM_QUEUES * 2 + 1]; 50 pthread_cond_t io_cond[VIRTIO_NET_NUM_QUEUES * 2 + 1]; 51 52 int vhost_fd; 53 int tap_fd; 54 char tap_name[IFNAMSIZ]; 55 56 int mode; 57 58 struct uip_info info; 59 struct net_dev_operations *ops; 60 struct kvm *kvm; 61 62 struct virtio_net_params *params; 63 }; 64 65 static LIST_HEAD(ndevs); 66 static int compat_id = -1; 67 68 #define MAX_PACKET_SIZE 65550 69 70 static bool has_virtio_feature(struct net_dev *ndev, u32 feature) 71 { 72 return ndev->features & (1 << feature); 73 } 74 75 static void virtio_net_fix_tx_hdr(struct virtio_net_hdr *hdr, struct net_dev *ndev) 76 { 77 hdr->hdr_len = virtio_guest_to_host_u16(&ndev->vdev, hdr->hdr_len); 78 hdr->gso_size = virtio_guest_to_host_u16(&ndev->vdev, hdr->gso_size); 79 hdr->csum_start = virtio_guest_to_host_u16(&ndev->vdev, hdr->csum_start); 80 hdr->csum_offset = virtio_guest_to_host_u16(&ndev->vdev, hdr->csum_offset); 81 } 82 83 static void virtio_net_fix_rx_hdr(struct virtio_net_hdr_mrg_rxbuf *hdr, struct net_dev *ndev) 84 { 85 hdr->hdr.hdr_len = virtio_host_to_guest_u16(&ndev->vdev, hdr->hdr.hdr_len); 86 hdr->hdr.gso_size = virtio_host_to_guest_u16(&ndev->vdev, hdr->hdr.gso_size); 87 hdr->hdr.csum_start = virtio_host_to_guest_u16(&ndev->vdev, hdr->hdr.csum_start); 88 hdr->hdr.csum_offset = virtio_host_to_guest_u16(&ndev->vdev, hdr->hdr.csum_offset); 89 if (has_virtio_feature(ndev, VIRTIO_NET_F_MRG_RXBUF)) 90 hdr->num_buffers = virtio_host_to_guest_u16(&ndev->vdev, hdr->num_buffers); 91 } 92 93 static void *virtio_net_rx_thread(void *p) 94 { 95 struct iovec iov[VIRTIO_NET_QUEUE_SIZE]; 96 struct virt_queue *vq; 97 struct kvm *kvm; 98 struct net_dev *ndev = p; 99 u16 out, in; 100 u16 head; 101 int len, copied; 102 u32 id; 103 104 mutex_lock(&ndev->mutex); 105 id = ndev->rx_vqs++ * 2; 106 mutex_unlock(&ndev->mutex); 107 108 kvm__set_thread_name("virtio-net-rx"); 109 110 kvm = ndev->kvm; 111 vq = &ndev->vqs[id]; 112 113 while (1) { 114 mutex_lock(&ndev->io_lock[id]); 115 if (!virt_queue__available(vq)) 116 pthread_cond_wait(&ndev->io_cond[id], &ndev->io_lock[id].mutex); 117 mutex_unlock(&ndev->io_lock[id]); 118 119 while (virt_queue__available(vq)) { 120 unsigned char buffer[MAX_PACKET_SIZE + sizeof(struct virtio_net_hdr_mrg_rxbuf)]; 121 struct iovec dummy_iov = { 122 .iov_base = buffer, 123 .iov_len = sizeof(buffer), 124 }; 125 struct virtio_net_hdr_mrg_rxbuf *hdr; 126 int i; 127 128 len = ndev->ops->rx(&dummy_iov, 1, ndev); 129 if (len < 0) { 130 pr_warning("%s: rx on vq %u failed (%d), exiting thread\n", 131 __func__, id, len); 132 goto out_err; 133 } 134 135 copied = i = 0; 136 head = virt_queue__get_iov(vq, iov, &out, &in, kvm); 137 hdr = iov[0].iov_base; 138 while (copied < len) { 139 size_t iovsize = min_t(size_t, len - copied, iov_size(iov, in)); 140 141 memcpy_toiovec(iov, buffer + copied, iovsize); 142 copied += iovsize; 143 if (i++ == 0) 144 virtio_net_fix_rx_hdr(hdr, ndev); 145 if (has_virtio_feature(ndev, VIRTIO_NET_F_MRG_RXBUF)) { 146 u16 num_buffers = virtio_guest_to_host_u16(vq, hdr->num_buffers); 147 hdr->num_buffers = virtio_host_to_guest_u16(vq, num_buffers + 1); 148 } 149 virt_queue__set_used_elem(vq, head, iovsize); 150 if (copied == len) 151 break; 152 while (!virt_queue__available(vq)) 153 sleep(0); 154 head = virt_queue__get_iov(vq, iov, &out, &in, kvm); 155 } 156 /* We should interrupt guest right now, otherwise latency is huge. */ 157 if (virtio_queue__should_signal(vq)) 158 ndev->vdev.ops->signal_vq(kvm, &ndev->vdev, id); 159 } 160 } 161 162 out_err: 163 pthread_exit(NULL); 164 return NULL; 165 166 } 167 168 static void *virtio_net_tx_thread(void *p) 169 { 170 struct iovec iov[VIRTIO_NET_QUEUE_SIZE]; 171 struct virt_queue *vq; 172 struct kvm *kvm; 173 struct net_dev *ndev = p; 174 u16 out, in; 175 u16 head; 176 int len; 177 u32 id; 178 179 mutex_lock(&ndev->mutex); 180 id = ndev->tx_vqs++ * 2 + 1; 181 mutex_unlock(&ndev->mutex); 182 183 kvm__set_thread_name("virtio-net-tx"); 184 185 kvm = ndev->kvm; 186 vq = &ndev->vqs[id]; 187 188 while (1) { 189 mutex_lock(&ndev->io_lock[id]); 190 if (!virt_queue__available(vq)) 191 pthread_cond_wait(&ndev->io_cond[id], &ndev->io_lock[id].mutex); 192 mutex_unlock(&ndev->io_lock[id]); 193 194 while (virt_queue__available(vq)) { 195 struct virtio_net_hdr *hdr; 196 head = virt_queue__get_iov(vq, iov, &out, &in, kvm); 197 hdr = iov[0].iov_base; 198 virtio_net_fix_tx_hdr(hdr, ndev); 199 len = ndev->ops->tx(iov, out, ndev); 200 if (len < 0) { 201 pr_warning("%s: tx on vq %u failed (%d)\n", 202 __func__, id, errno); 203 goto out_err; 204 } 205 206 virt_queue__set_used_elem(vq, head, len); 207 } 208 209 if (virtio_queue__should_signal(vq)) 210 ndev->vdev.ops->signal_vq(kvm, &ndev->vdev, id); 211 } 212 213 out_err: 214 pthread_exit(NULL); 215 return NULL; 216 } 217 218 static virtio_net_ctrl_ack virtio_net_handle_mq(struct kvm* kvm, struct net_dev *ndev, struct virtio_net_ctrl_hdr *ctrl) 219 { 220 /* Not much to do here */ 221 return VIRTIO_NET_OK; 222 } 223 224 static void *virtio_net_ctrl_thread(void *p) 225 { 226 struct iovec iov[VIRTIO_NET_QUEUE_SIZE]; 227 u16 out, in, head; 228 struct net_dev *ndev = p; 229 struct kvm *kvm = ndev->kvm; 230 u32 id = ndev->queue_pairs * 2; 231 struct virt_queue *vq = &ndev->vqs[id]; 232 struct virtio_net_ctrl_hdr *ctrl; 233 virtio_net_ctrl_ack *ack; 234 235 while (1) { 236 mutex_lock(&ndev->io_lock[id]); 237 if (!virt_queue__available(vq)) 238 pthread_cond_wait(&ndev->io_cond[id], &ndev->io_lock[id].mutex); 239 mutex_unlock(&ndev->io_lock[id]); 240 241 while (virt_queue__available(vq)) { 242 head = virt_queue__get_iov(&ndev->vqs[id], iov, &out, &in, kvm); 243 ctrl = iov[0].iov_base; 244 ack = iov[out].iov_base; 245 246 switch (ctrl->class) { 247 case VIRTIO_NET_CTRL_MQ: 248 *ack = virtio_net_handle_mq(kvm, ndev, ctrl); 249 break; 250 default: 251 *ack = VIRTIO_NET_ERR; 252 break; 253 } 254 virt_queue__set_used_elem(&ndev->vqs[id], head, iov[out].iov_len); 255 } 256 257 if (virtio_queue__should_signal(&ndev->vqs[id])) 258 ndev->vdev.ops->signal_vq(kvm, &ndev->vdev, id); 259 } 260 261 pthread_exit(NULL); 262 263 return NULL; 264 } 265 266 static void virtio_net_handle_callback(struct kvm *kvm, struct net_dev *ndev, int queue) 267 { 268 if ((u32)queue >= (ndev->queue_pairs * 2 + 1)) { 269 pr_warning("Unknown queue index %u", queue); 270 return; 271 } 272 273 mutex_lock(&ndev->io_lock[queue]); 274 pthread_cond_signal(&ndev->io_cond[queue]); 275 mutex_unlock(&ndev->io_lock[queue]); 276 } 277 278 static int virtio_net_request_tap(struct net_dev *ndev, struct ifreq *ifr, 279 const char *tapname) 280 { 281 int ret; 282 283 memset(ifr, 0, sizeof(*ifr)); 284 ifr->ifr_flags = IFF_TAP | IFF_NO_PI | IFF_VNET_HDR; 285 if (tapname) 286 strncpy(ifr->ifr_name, tapname, sizeof(ifr->ifr_name)); 287 288 ret = ioctl(ndev->tap_fd, TUNSETIFF, &ifr); 289 290 if (ret >= 0) 291 strncpy(ndev->tap_name, ifr->ifr_name, sizeof(ndev->tap_name)); 292 return ret; 293 } 294 295 static bool virtio_net__tap_init(struct net_dev *ndev) 296 { 297 int sock = socket(AF_INET, SOCK_STREAM, 0); 298 int pid, status, offload, hdr_len; 299 struct sockaddr_in sin = {0}; 300 struct ifreq ifr; 301 const struct virtio_net_params *params = ndev->params; 302 bool skipconf = !!params->tapif; 303 bool macvtap = skipconf && (params->tapif[0] == '/'); 304 const char *tap_file = "/dev/net/tun"; 305 306 /* Did the user already gave us the FD? */ 307 if (params->fd) { 308 ndev->tap_fd = params->fd; 309 return 1; 310 } 311 312 if (macvtap) 313 tap_file = params->tapif; 314 315 ndev->tap_fd = open(tap_file, O_RDWR); 316 if (ndev->tap_fd < 0) { 317 pr_warning("Unable to open %s", tap_file); 318 goto fail; 319 } 320 321 if (!macvtap && 322 virtio_net_request_tap(ndev, &ifr, params->tapif) < 0) { 323 pr_warning("Config tap device error. Are you root?"); 324 goto fail; 325 } 326 327 hdr_len = has_virtio_feature(ndev, VIRTIO_NET_F_MRG_RXBUF) ? 328 sizeof(struct virtio_net_hdr_mrg_rxbuf) : 329 sizeof(struct virtio_net_hdr); 330 if (ioctl(ndev->tap_fd, TUNSETVNETHDRSZ, &hdr_len) < 0) 331 pr_warning("Config tap device TUNSETVNETHDRSZ error"); 332 333 offload = TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6 | TUN_F_UFO; 334 if (ioctl(ndev->tap_fd, TUNSETOFFLOAD, offload) < 0) { 335 pr_warning("Config tap device TUNSETOFFLOAD error"); 336 goto fail; 337 } 338 339 if (strcmp(params->script, "none")) { 340 pid = fork(); 341 if (pid == 0) { 342 execl(params->script, params->script, ndev->tap_name, NULL); 343 _exit(1); 344 } else { 345 waitpid(pid, &status, 0); 346 if (WIFEXITED(status) && WEXITSTATUS(status) != 0) { 347 pr_warning("Fail to setup tap by %s", params->script); 348 goto fail; 349 } 350 } 351 } else if (!skipconf) { 352 memset(&ifr, 0, sizeof(ifr)); 353 strncpy(ifr.ifr_name, ndev->tap_name, sizeof(ndev->tap_name)); 354 sin.sin_addr.s_addr = inet_addr(params->host_ip); 355 memcpy(&(ifr.ifr_addr), &sin, sizeof(ifr.ifr_addr)); 356 ifr.ifr_addr.sa_family = AF_INET; 357 if (ioctl(sock, SIOCSIFADDR, &ifr) < 0) { 358 pr_warning("Could not set ip address on tap device"); 359 goto fail; 360 } 361 } 362 363 if (!skipconf) { 364 memset(&ifr, 0, sizeof(ifr)); 365 strncpy(ifr.ifr_name, ndev->tap_name, sizeof(ndev->tap_name)); 366 ioctl(sock, SIOCGIFFLAGS, &ifr); 367 ifr.ifr_flags |= IFF_UP | IFF_RUNNING; 368 if (ioctl(sock, SIOCSIFFLAGS, &ifr) < 0) 369 pr_warning("Could not bring tap device up"); 370 } 371 372 close(sock); 373 374 return 1; 375 376 fail: 377 if (sock >= 0) 378 close(sock); 379 if (ndev->tap_fd >= 0) 380 close(ndev->tap_fd); 381 382 return 0; 383 } 384 385 static inline int tap_ops_tx(struct iovec *iov, u16 out, struct net_dev *ndev) 386 { 387 return writev(ndev->tap_fd, iov, out); 388 } 389 390 static inline int tap_ops_rx(struct iovec *iov, u16 in, struct net_dev *ndev) 391 { 392 return readv(ndev->tap_fd, iov, in); 393 } 394 395 static inline int uip_ops_tx(struct iovec *iov, u16 out, struct net_dev *ndev) 396 { 397 return uip_tx(iov, out, &ndev->info); 398 } 399 400 static inline int uip_ops_rx(struct iovec *iov, u16 in, struct net_dev *ndev) 401 { 402 return uip_rx(iov, in, &ndev->info); 403 } 404 405 static struct net_dev_operations tap_ops = { 406 .rx = tap_ops_rx, 407 .tx = tap_ops_tx, 408 }; 409 410 static struct net_dev_operations uip_ops = { 411 .rx = uip_ops_rx, 412 .tx = uip_ops_tx, 413 }; 414 415 static u8 *get_config(struct kvm *kvm, void *dev) 416 { 417 struct net_dev *ndev = dev; 418 419 return ((u8 *)(&ndev->config)); 420 } 421 422 static u32 get_host_features(struct kvm *kvm, void *dev) 423 { 424 struct net_dev *ndev = dev; 425 426 return 1UL << VIRTIO_NET_F_MAC 427 | 1UL << VIRTIO_NET_F_CSUM 428 | 1UL << VIRTIO_NET_F_HOST_UFO 429 | 1UL << VIRTIO_NET_F_HOST_TSO4 430 | 1UL << VIRTIO_NET_F_HOST_TSO6 431 | 1UL << VIRTIO_NET_F_GUEST_UFO 432 | 1UL << VIRTIO_NET_F_GUEST_TSO4 433 | 1UL << VIRTIO_NET_F_GUEST_TSO6 434 | 1UL << VIRTIO_RING_F_EVENT_IDX 435 | 1UL << VIRTIO_RING_F_INDIRECT_DESC 436 | 1UL << VIRTIO_NET_F_CTRL_VQ 437 | 1UL << VIRTIO_NET_F_MRG_RXBUF 438 | 1UL << (ndev->queue_pairs > 1 ? VIRTIO_NET_F_MQ : 0); 439 } 440 441 static int virtio_net__vhost_set_features(struct net_dev *ndev) 442 { 443 u64 features = 1UL << VIRTIO_RING_F_EVENT_IDX; 444 u64 vhost_features; 445 446 if (ioctl(ndev->vhost_fd, VHOST_GET_FEATURES, &vhost_features) != 0) 447 die_perror("VHOST_GET_FEATURES failed"); 448 449 /* make sure both side support mergable rx buffers */ 450 if (vhost_features & 1UL << VIRTIO_NET_F_MRG_RXBUF && 451 has_virtio_feature(ndev, VIRTIO_NET_F_MRG_RXBUF)) 452 features |= 1UL << VIRTIO_NET_F_MRG_RXBUF; 453 454 return ioctl(ndev->vhost_fd, VHOST_SET_FEATURES, &features); 455 } 456 457 static void set_guest_features(struct kvm *kvm, void *dev, u32 features) 458 { 459 struct net_dev *ndev = dev; 460 struct virtio_net_config *conf = &ndev->config; 461 462 ndev->features = features; 463 464 conf->status = virtio_host_to_guest_u16(&ndev->vdev, conf->status); 465 conf->max_virtqueue_pairs = virtio_host_to_guest_u16(&ndev->vdev, 466 conf->max_virtqueue_pairs); 467 468 if (ndev->mode == NET_MODE_TAP) { 469 if (!virtio_net__tap_init(ndev)) 470 die_perror("You have requested a TAP device, but creation of one has failed because"); 471 if (ndev->vhost_fd && 472 virtio_net__vhost_set_features(ndev) != 0) 473 die_perror("VHOST_SET_FEATURES failed"); 474 } else { 475 ndev->info.vnet_hdr_len = has_virtio_feature(ndev, VIRTIO_NET_F_MRG_RXBUF) ? 476 sizeof(struct virtio_net_hdr_mrg_rxbuf) : 477 sizeof(struct virtio_net_hdr); 478 uip_init(&ndev->info); 479 } 480 } 481 482 static bool is_ctrl_vq(struct net_dev *ndev, u32 vq) 483 { 484 return vq == (u32)(ndev->queue_pairs * 2); 485 } 486 487 static int init_vq(struct kvm *kvm, void *dev, u32 vq, u32 page_size, u32 align, 488 u32 pfn) 489 { 490 struct vhost_vring_state state = { .index = vq }; 491 struct vhost_vring_addr addr; 492 struct net_dev *ndev = dev; 493 struct virt_queue *queue; 494 void *p; 495 int r; 496 497 compat__remove_message(compat_id); 498 499 queue = &ndev->vqs[vq]; 500 queue->pfn = pfn; 501 p = virtio_get_vq(kvm, queue->pfn, page_size); 502 503 vring_init(&queue->vring, VIRTIO_NET_QUEUE_SIZE, p, align); 504 virtio_init_device_vq(&ndev->vdev, queue); 505 506 mutex_init(&ndev->io_lock[vq]); 507 pthread_cond_init(&ndev->io_cond[vq], NULL); 508 if (is_ctrl_vq(ndev, vq)) { 509 pthread_create(&ndev->io_thread[vq], NULL, virtio_net_ctrl_thread, ndev); 510 511 return 0; 512 } else if (ndev->vhost_fd == 0 ) { 513 if (vq & 1) 514 pthread_create(&ndev->io_thread[vq], NULL, virtio_net_tx_thread, ndev); 515 else 516 pthread_create(&ndev->io_thread[vq], NULL, virtio_net_rx_thread, ndev); 517 518 return 0; 519 } 520 521 if (queue->endian != VIRTIO_ENDIAN_HOST) 522 die_perror("VHOST requires VIRTIO_ENDIAN_HOST"); 523 524 state.num = queue->vring.num; 525 r = ioctl(ndev->vhost_fd, VHOST_SET_VRING_NUM, &state); 526 if (r < 0) 527 die_perror("VHOST_SET_VRING_NUM failed"); 528 state.num = 0; 529 r = ioctl(ndev->vhost_fd, VHOST_SET_VRING_BASE, &state); 530 if (r < 0) 531 die_perror("VHOST_SET_VRING_BASE failed"); 532 533 addr = (struct vhost_vring_addr) { 534 .index = vq, 535 .desc_user_addr = (u64)(unsigned long)queue->vring.desc, 536 .avail_user_addr = (u64)(unsigned long)queue->vring.avail, 537 .used_user_addr = (u64)(unsigned long)queue->vring.used, 538 }; 539 540 r = ioctl(ndev->vhost_fd, VHOST_SET_VRING_ADDR, &addr); 541 if (r < 0) 542 die_perror("VHOST_SET_VRING_ADDR failed"); 543 544 return 0; 545 } 546 547 static void notify_vq_gsi(struct kvm *kvm, void *dev, u32 vq, u32 gsi) 548 { 549 struct net_dev *ndev = dev; 550 struct kvm_irqfd irq; 551 struct vhost_vring_file file; 552 int r; 553 554 if (ndev->vhost_fd == 0) 555 return; 556 557 irq = (struct kvm_irqfd) { 558 .gsi = gsi, 559 .fd = eventfd(0, 0), 560 }; 561 file = (struct vhost_vring_file) { 562 .index = vq, 563 .fd = irq.fd, 564 }; 565 566 r = ioctl(kvm->vm_fd, KVM_IRQFD, &irq); 567 if (r < 0) 568 die_perror("KVM_IRQFD failed"); 569 570 r = ioctl(ndev->vhost_fd, VHOST_SET_VRING_CALL, &file); 571 if (r < 0) 572 die_perror("VHOST_SET_VRING_CALL failed"); 573 file.fd = ndev->tap_fd; 574 r = ioctl(ndev->vhost_fd, VHOST_NET_SET_BACKEND, &file); 575 if (r != 0) 576 die("VHOST_NET_SET_BACKEND failed %d", errno); 577 578 } 579 580 static void notify_vq_eventfd(struct kvm *kvm, void *dev, u32 vq, u32 efd) 581 { 582 struct net_dev *ndev = dev; 583 struct vhost_vring_file file = { 584 .index = vq, 585 .fd = efd, 586 }; 587 int r; 588 589 if (ndev->vhost_fd == 0 || is_ctrl_vq(ndev, vq)) 590 return; 591 592 r = ioctl(ndev->vhost_fd, VHOST_SET_VRING_KICK, &file); 593 if (r < 0) 594 die_perror("VHOST_SET_VRING_KICK failed"); 595 } 596 597 static int notify_vq(struct kvm *kvm, void *dev, u32 vq) 598 { 599 struct net_dev *ndev = dev; 600 601 virtio_net_handle_callback(kvm, ndev, vq); 602 603 return 0; 604 } 605 606 static int get_pfn_vq(struct kvm *kvm, void *dev, u32 vq) 607 { 608 struct net_dev *ndev = dev; 609 610 return ndev->vqs[vq].pfn; 611 } 612 613 static int get_size_vq(struct kvm *kvm, void *dev, u32 vq) 614 { 615 /* FIXME: dynamic */ 616 return VIRTIO_NET_QUEUE_SIZE; 617 } 618 619 static int set_size_vq(struct kvm *kvm, void *dev, u32 vq, int size) 620 { 621 /* FIXME: dynamic */ 622 return size; 623 } 624 625 static struct virtio_ops net_dev_virtio_ops = (struct virtio_ops) { 626 .get_config = get_config, 627 .get_host_features = get_host_features, 628 .set_guest_features = set_guest_features, 629 .init_vq = init_vq, 630 .get_pfn_vq = get_pfn_vq, 631 .get_size_vq = get_size_vq, 632 .set_size_vq = set_size_vq, 633 .notify_vq = notify_vq, 634 .notify_vq_gsi = notify_vq_gsi, 635 .notify_vq_eventfd = notify_vq_eventfd, 636 }; 637 638 static void virtio_net__vhost_init(struct kvm *kvm, struct net_dev *ndev) 639 { 640 struct vhost_memory *mem; 641 int r; 642 643 ndev->vhost_fd = open("/dev/vhost-net", O_RDWR); 644 if (ndev->vhost_fd < 0) 645 die_perror("Failed openning vhost-net device"); 646 647 mem = calloc(1, sizeof(*mem) + sizeof(struct vhost_memory_region)); 648 if (mem == NULL) 649 die("Failed allocating memory for vhost memory map"); 650 651 mem->nregions = 1; 652 mem->regions[0] = (struct vhost_memory_region) { 653 .guest_phys_addr = 0, 654 .memory_size = kvm->ram_size, 655 .userspace_addr = (unsigned long)kvm->ram_start, 656 }; 657 658 r = ioctl(ndev->vhost_fd, VHOST_SET_OWNER); 659 if (r != 0) 660 die_perror("VHOST_SET_OWNER failed"); 661 662 r = ioctl(ndev->vhost_fd, VHOST_SET_MEM_TABLE, mem); 663 if (r != 0) 664 die_perror("VHOST_SET_MEM_TABLE failed"); 665 666 ndev->vdev.use_vhost = true; 667 668 free(mem); 669 } 670 671 static inline void str_to_mac(const char *str, char *mac) 672 { 673 sscanf(str, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", 674 mac, mac+1, mac+2, mac+3, mac+4, mac+5); 675 } 676 static int set_net_param(struct kvm *kvm, struct virtio_net_params *p, 677 const char *param, const char *val) 678 { 679 if (strcmp(param, "guest_mac") == 0) { 680 str_to_mac(val, p->guest_mac); 681 } else if (strcmp(param, "mode") == 0) { 682 if (!strncmp(val, "user", 4)) { 683 int i; 684 685 for (i = 0; i < kvm->cfg.num_net_devices; i++) 686 if (kvm->cfg.net_params[i].mode == NET_MODE_USER) 687 die("Only one usermode network device allowed at a time"); 688 p->mode = NET_MODE_USER; 689 } else if (!strncmp(val, "tap", 3)) { 690 p->mode = NET_MODE_TAP; 691 } else if (!strncmp(val, "none", 4)) { 692 kvm->cfg.no_net = 1; 693 return -1; 694 } else 695 die("Unknown network mode %s, please use user, tap or none", kvm->cfg.network); 696 } else if (strcmp(param, "script") == 0) { 697 p->script = strdup(val); 698 } else if (strcmp(param, "guest_ip") == 0) { 699 p->guest_ip = strdup(val); 700 } else if (strcmp(param, "host_ip") == 0) { 701 p->host_ip = strdup(val); 702 } else if (strcmp(param, "trans") == 0) { 703 p->trans = strdup(val); 704 } else if (strcmp(param, "tapif") == 0) { 705 p->tapif = strdup(val); 706 } else if (strcmp(param, "vhost") == 0) { 707 p->vhost = atoi(val); 708 } else if (strcmp(param, "fd") == 0) { 709 p->fd = atoi(val); 710 } else if (strcmp(param, "mq") == 0) { 711 p->mq = atoi(val); 712 } else 713 die("Unknown network parameter %s", param); 714 715 return 0; 716 } 717 718 int netdev_parser(const struct option *opt, const char *arg, int unset) 719 { 720 struct virtio_net_params p; 721 char *buf = NULL, *cmd = NULL, *cur = NULL; 722 bool on_cmd = true; 723 struct kvm *kvm = opt->ptr; 724 725 if (arg) { 726 buf = strdup(arg); 727 if (buf == NULL) 728 die("Failed allocating new net buffer"); 729 cur = strtok(buf, ",="); 730 } 731 732 p = (struct virtio_net_params) { 733 .guest_ip = DEFAULT_GUEST_ADDR, 734 .host_ip = DEFAULT_HOST_ADDR, 735 .script = DEFAULT_SCRIPT, 736 .mode = NET_MODE_TAP, 737 }; 738 739 str_to_mac(DEFAULT_GUEST_MAC, p.guest_mac); 740 p.guest_mac[5] += kvm->cfg.num_net_devices; 741 742 while (cur) { 743 if (on_cmd) { 744 cmd = cur; 745 } else { 746 if (set_net_param(kvm, &p, cmd, cur) < 0) 747 goto done; 748 } 749 on_cmd = !on_cmd; 750 751 cur = strtok(NULL, ",="); 752 }; 753 754 kvm->cfg.num_net_devices++; 755 756 kvm->cfg.net_params = realloc(kvm->cfg.net_params, kvm->cfg.num_net_devices * sizeof(*kvm->cfg.net_params)); 757 if (kvm->cfg.net_params == NULL) 758 die("Failed adding new network device"); 759 760 kvm->cfg.net_params[kvm->cfg.num_net_devices - 1] = p; 761 762 done: 763 free(buf); 764 return 0; 765 } 766 767 static int virtio_net__init_one(struct virtio_net_params *params) 768 { 769 int i, err; 770 struct net_dev *ndev; 771 struct virtio_ops *ops; 772 enum virtio_trans trans = VIRTIO_DEFAULT_TRANS(params->kvm); 773 774 ndev = calloc(1, sizeof(struct net_dev)); 775 if (ndev == NULL) 776 return -ENOMEM; 777 778 ops = malloc(sizeof(*ops)); 779 if (ops == NULL) { 780 err = -ENOMEM; 781 goto err_free_ndev; 782 } 783 784 list_add_tail(&ndev->list, &ndevs); 785 786 ndev->kvm = params->kvm; 787 ndev->params = params; 788 789 mutex_init(&ndev->mutex); 790 ndev->queue_pairs = max(1, min(VIRTIO_NET_NUM_QUEUES, params->mq)); 791 ndev->config.status = VIRTIO_NET_S_LINK_UP; 792 if (ndev->queue_pairs > 1) 793 ndev->config.max_virtqueue_pairs = ndev->queue_pairs; 794 795 for (i = 0 ; i < 6 ; i++) { 796 ndev->config.mac[i] = params->guest_mac[i]; 797 ndev->info.guest_mac.addr[i] = params->guest_mac[i]; 798 ndev->info.host_mac.addr[i] = params->host_mac[i]; 799 } 800 801 ndev->mode = params->mode; 802 if (ndev->mode == NET_MODE_TAP) { 803 ndev->ops = &tap_ops; 804 } else { 805 ndev->info.host_ip = ntohl(inet_addr(params->host_ip)); 806 ndev->info.guest_ip = ntohl(inet_addr(params->guest_ip)); 807 ndev->info.guest_netmask = ntohl(inet_addr("255.255.255.0")); 808 ndev->info.buf_nr = 20, 809 ndev->ops = &uip_ops; 810 uip_static_init(&ndev->info); 811 } 812 813 *ops = net_dev_virtio_ops; 814 815 if (params->trans) { 816 if (strcmp(params->trans, "mmio") == 0) 817 trans = VIRTIO_MMIO; 818 else if (strcmp(params->trans, "pci") == 0) 819 trans = VIRTIO_PCI; 820 else 821 pr_warning("virtio-net: Unknown transport method : %s, " 822 "falling back to %s.", params->trans, 823 virtio_trans_name(trans)); 824 } 825 826 virtio_init(params->kvm, ndev, &ndev->vdev, ops, trans, 827 PCI_DEVICE_ID_VIRTIO_NET, VIRTIO_ID_NET, PCI_CLASS_NET); 828 829 if (params->vhost) 830 virtio_net__vhost_init(params->kvm, ndev); 831 832 if (compat_id == -1) 833 compat_id = virtio_compat_add_message("virtio-net", "CONFIG_VIRTIO_NET"); 834 835 return 0; 836 837 err_free_ndev: 838 free(ndev); 839 return err; 840 } 841 842 int virtio_net__init(struct kvm *kvm) 843 { 844 int i; 845 846 for (i = 0; i < kvm->cfg.num_net_devices; i++) { 847 kvm->cfg.net_params[i].kvm = kvm; 848 virtio_net__init_one(&kvm->cfg.net_params[i]); 849 } 850 851 if (kvm->cfg.num_net_devices == 0 && kvm->cfg.no_net == 0) { 852 static struct virtio_net_params net_params; 853 854 net_params = (struct virtio_net_params) { 855 .guest_ip = kvm->cfg.guest_ip, 856 .host_ip = kvm->cfg.host_ip, 857 .kvm = kvm, 858 .script = kvm->cfg.script, 859 .mode = NET_MODE_USER, 860 }; 861 str_to_mac(kvm->cfg.guest_mac, net_params.guest_mac); 862 str_to_mac(kvm->cfg.host_mac, net_params.host_mac); 863 864 virtio_net__init_one(&net_params); 865 } 866 867 return 0; 868 } 869 virtio_dev_init(virtio_net__init); 870 871 int virtio_net__exit(struct kvm *kvm) 872 { 873 return 0; 874 } 875 virtio_dev_exit(virtio_net__exit); 876