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