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