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 kvm__set_thread_name("virtio-net-ctrl"); 236 237 while (1) { 238 mutex_lock(&ndev->io_lock[id]); 239 if (!virt_queue__available(vq)) 240 pthread_cond_wait(&ndev->io_cond[id], &ndev->io_lock[id].mutex); 241 mutex_unlock(&ndev->io_lock[id]); 242 243 while (virt_queue__available(vq)) { 244 head = virt_queue__get_iov(&ndev->vqs[id], iov, &out, &in, kvm); 245 ctrl = iov[0].iov_base; 246 ack = iov[out].iov_base; 247 248 switch (ctrl->class) { 249 case VIRTIO_NET_CTRL_MQ: 250 *ack = virtio_net_handle_mq(kvm, ndev, ctrl); 251 break; 252 default: 253 *ack = VIRTIO_NET_ERR; 254 break; 255 } 256 virt_queue__set_used_elem(&ndev->vqs[id], head, iov[out].iov_len); 257 } 258 259 if (virtio_queue__should_signal(&ndev->vqs[id])) 260 ndev->vdev.ops->signal_vq(kvm, &ndev->vdev, id); 261 } 262 263 pthread_exit(NULL); 264 265 return NULL; 266 } 267 268 static void virtio_net_handle_callback(struct kvm *kvm, struct net_dev *ndev, int queue) 269 { 270 if ((u32)queue >= (ndev->queue_pairs * 2 + 1)) { 271 pr_warning("Unknown queue index %u", queue); 272 return; 273 } 274 275 mutex_lock(&ndev->io_lock[queue]); 276 pthread_cond_signal(&ndev->io_cond[queue]); 277 mutex_unlock(&ndev->io_lock[queue]); 278 } 279 280 static int virtio_net_request_tap(struct net_dev *ndev, struct ifreq *ifr, 281 const char *tapname) 282 { 283 int ret; 284 285 memset(ifr, 0, sizeof(*ifr)); 286 ifr->ifr_flags = IFF_TAP | IFF_NO_PI | IFF_VNET_HDR; 287 if (tapname) 288 strncpy(ifr->ifr_name, tapname, sizeof(ifr->ifr_name)); 289 290 ret = ioctl(ndev->tap_fd, TUNSETIFF, ifr); 291 292 if (ret >= 0) 293 strncpy(ndev->tap_name, ifr->ifr_name, sizeof(ndev->tap_name)); 294 return ret; 295 } 296 297 static int virtio_net_exec_script(const char* script, const char *tap_name) 298 { 299 pid_t pid; 300 int status; 301 302 pid = fork(); 303 if (pid == 0) { 304 execl(script, script, tap_name, NULL); 305 _exit(1); 306 } else { 307 waitpid(pid, &status, 0); 308 if (WIFEXITED(status) && WEXITSTATUS(status) != 0) { 309 pr_warning("Fail to setup tap by %s", script); 310 return -1; 311 } 312 } 313 return 0; 314 } 315 316 static bool virtio_net__tap_init(struct net_dev *ndev) 317 { 318 int sock = socket(AF_INET, SOCK_STREAM, 0); 319 int offload, hdr_len; 320 struct sockaddr_in sin = {0}; 321 struct ifreq ifr; 322 const struct virtio_net_params *params = ndev->params; 323 bool skipconf = !!params->tapif; 324 bool macvtap = skipconf && (params->tapif[0] == '/'); 325 const char *tap_file = "/dev/net/tun"; 326 327 /* Did the user already gave us the FD? */ 328 if (params->fd) { 329 ndev->tap_fd = params->fd; 330 return 1; 331 } 332 333 if (macvtap) 334 tap_file = params->tapif; 335 336 ndev->tap_fd = open(tap_file, O_RDWR); 337 if (ndev->tap_fd < 0) { 338 pr_warning("Unable to open %s", tap_file); 339 goto fail; 340 } 341 342 if (!macvtap && 343 virtio_net_request_tap(ndev, &ifr, params->tapif) < 0) { 344 pr_warning("Config tap device error. Are you root?"); 345 goto fail; 346 } 347 348 hdr_len = has_virtio_feature(ndev, VIRTIO_NET_F_MRG_RXBUF) ? 349 sizeof(struct virtio_net_hdr_mrg_rxbuf) : 350 sizeof(struct virtio_net_hdr); 351 if (ioctl(ndev->tap_fd, TUNSETVNETHDRSZ, &hdr_len) < 0) 352 pr_warning("Config tap device TUNSETVNETHDRSZ error"); 353 354 offload = TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6 | TUN_F_UFO; 355 if (ioctl(ndev->tap_fd, TUNSETOFFLOAD, offload) < 0) { 356 pr_warning("Config tap device TUNSETOFFLOAD error"); 357 goto fail; 358 } 359 360 if (strcmp(params->script, "none")) { 361 if (virtio_net_exec_script(params->script, ndev->tap_name) < 0) 362 goto fail; 363 } else if (!skipconf) { 364 memset(&ifr, 0, sizeof(ifr)); 365 strncpy(ifr.ifr_name, ndev->tap_name, sizeof(ndev->tap_name)); 366 sin.sin_addr.s_addr = inet_addr(params->host_ip); 367 memcpy(&(ifr.ifr_addr), &sin, sizeof(ifr.ifr_addr)); 368 ifr.ifr_addr.sa_family = AF_INET; 369 if (ioctl(sock, SIOCSIFADDR, &ifr) < 0) { 370 pr_warning("Could not set ip address on tap device"); 371 goto fail; 372 } 373 } 374 375 if (!skipconf) { 376 memset(&ifr, 0, sizeof(ifr)); 377 strncpy(ifr.ifr_name, ndev->tap_name, sizeof(ndev->tap_name)); 378 ioctl(sock, SIOCGIFFLAGS, &ifr); 379 ifr.ifr_flags |= IFF_UP | IFF_RUNNING; 380 if (ioctl(sock, SIOCSIFFLAGS, &ifr) < 0) 381 pr_warning("Could not bring tap device up"); 382 } 383 384 close(sock); 385 386 return 1; 387 388 fail: 389 if (sock >= 0) 390 close(sock); 391 if (ndev->tap_fd >= 0) 392 close(ndev->tap_fd); 393 394 return 0; 395 } 396 397 static inline int tap_ops_tx(struct iovec *iov, u16 out, struct net_dev *ndev) 398 { 399 return writev(ndev->tap_fd, iov, out); 400 } 401 402 static inline int tap_ops_rx(struct iovec *iov, u16 in, struct net_dev *ndev) 403 { 404 return readv(ndev->tap_fd, iov, in); 405 } 406 407 static inline int uip_ops_tx(struct iovec *iov, u16 out, struct net_dev *ndev) 408 { 409 return uip_tx(iov, out, &ndev->info); 410 } 411 412 static inline int uip_ops_rx(struct iovec *iov, u16 in, struct net_dev *ndev) 413 { 414 return uip_rx(iov, in, &ndev->info); 415 } 416 417 static struct net_dev_operations tap_ops = { 418 .rx = tap_ops_rx, 419 .tx = tap_ops_tx, 420 }; 421 422 static struct net_dev_operations uip_ops = { 423 .rx = uip_ops_rx, 424 .tx = uip_ops_tx, 425 }; 426 427 static u8 *get_config(struct kvm *kvm, void *dev) 428 { 429 struct net_dev *ndev = dev; 430 431 return ((u8 *)(&ndev->config)); 432 } 433 434 static u32 get_host_features(struct kvm *kvm, void *dev) 435 { 436 struct net_dev *ndev = dev; 437 438 return 1UL << VIRTIO_NET_F_MAC 439 | 1UL << VIRTIO_NET_F_CSUM 440 | 1UL << VIRTIO_NET_F_HOST_UFO 441 | 1UL << VIRTIO_NET_F_HOST_TSO4 442 | 1UL << VIRTIO_NET_F_HOST_TSO6 443 | 1UL << VIRTIO_NET_F_GUEST_UFO 444 | 1UL << VIRTIO_NET_F_GUEST_TSO4 445 | 1UL << VIRTIO_NET_F_GUEST_TSO6 446 | 1UL << VIRTIO_RING_F_EVENT_IDX 447 | 1UL << VIRTIO_RING_F_INDIRECT_DESC 448 | 1UL << VIRTIO_NET_F_CTRL_VQ 449 | 1UL << VIRTIO_NET_F_MRG_RXBUF 450 | 1UL << (ndev->queue_pairs > 1 ? VIRTIO_NET_F_MQ : 0); 451 } 452 453 static int virtio_net__vhost_set_features(struct net_dev *ndev) 454 { 455 u64 features = 1UL << VIRTIO_RING_F_EVENT_IDX; 456 u64 vhost_features; 457 458 if (ioctl(ndev->vhost_fd, VHOST_GET_FEATURES, &vhost_features) != 0) 459 die_perror("VHOST_GET_FEATURES failed"); 460 461 /* make sure both side support mergable rx buffers */ 462 if (vhost_features & 1UL << VIRTIO_NET_F_MRG_RXBUF && 463 has_virtio_feature(ndev, VIRTIO_NET_F_MRG_RXBUF)) 464 features |= 1UL << VIRTIO_NET_F_MRG_RXBUF; 465 466 return ioctl(ndev->vhost_fd, VHOST_SET_FEATURES, &features); 467 } 468 469 static void set_guest_features(struct kvm *kvm, void *dev, u32 features) 470 { 471 struct net_dev *ndev = dev; 472 struct virtio_net_config *conf = &ndev->config; 473 474 ndev->features = features; 475 476 conf->status = virtio_host_to_guest_u16(&ndev->vdev, conf->status); 477 conf->max_virtqueue_pairs = virtio_host_to_guest_u16(&ndev->vdev, 478 conf->max_virtqueue_pairs); 479 480 if (ndev->mode == NET_MODE_TAP) { 481 if (!virtio_net__tap_init(ndev)) 482 die_perror("You have requested a TAP device, but creation of one has failed because"); 483 if (ndev->vhost_fd && 484 virtio_net__vhost_set_features(ndev) != 0) 485 die_perror("VHOST_SET_FEATURES failed"); 486 } else { 487 ndev->info.vnet_hdr_len = has_virtio_feature(ndev, VIRTIO_NET_F_MRG_RXBUF) ? 488 sizeof(struct virtio_net_hdr_mrg_rxbuf) : 489 sizeof(struct virtio_net_hdr); 490 uip_init(&ndev->info); 491 } 492 } 493 494 static bool is_ctrl_vq(struct net_dev *ndev, u32 vq) 495 { 496 return vq == (u32)(ndev->queue_pairs * 2); 497 } 498 499 static int init_vq(struct kvm *kvm, void *dev, u32 vq, u32 page_size, u32 align, 500 u32 pfn) 501 { 502 struct vhost_vring_state state = { .index = vq }; 503 struct vhost_vring_addr addr; 504 struct net_dev *ndev = dev; 505 struct virt_queue *queue; 506 void *p; 507 int r; 508 509 compat__remove_message(compat_id); 510 511 queue = &ndev->vqs[vq]; 512 queue->pfn = pfn; 513 p = virtio_get_vq(kvm, queue->pfn, page_size); 514 515 vring_init(&queue->vring, VIRTIO_NET_QUEUE_SIZE, p, align); 516 virtio_init_device_vq(&ndev->vdev, queue); 517 518 mutex_init(&ndev->io_lock[vq]); 519 pthread_cond_init(&ndev->io_cond[vq], NULL); 520 if (is_ctrl_vq(ndev, vq)) { 521 pthread_create(&ndev->io_thread[vq], NULL, virtio_net_ctrl_thread, ndev); 522 523 return 0; 524 } else if (ndev->vhost_fd == 0 ) { 525 if (vq & 1) 526 pthread_create(&ndev->io_thread[vq], NULL, virtio_net_tx_thread, ndev); 527 else 528 pthread_create(&ndev->io_thread[vq], NULL, virtio_net_rx_thread, ndev); 529 530 return 0; 531 } 532 533 if (queue->endian != VIRTIO_ENDIAN_HOST) 534 die_perror("VHOST requires VIRTIO_ENDIAN_HOST"); 535 536 state.num = queue->vring.num; 537 r = ioctl(ndev->vhost_fd, VHOST_SET_VRING_NUM, &state); 538 if (r < 0) 539 die_perror("VHOST_SET_VRING_NUM failed"); 540 state.num = 0; 541 r = ioctl(ndev->vhost_fd, VHOST_SET_VRING_BASE, &state); 542 if (r < 0) 543 die_perror("VHOST_SET_VRING_BASE failed"); 544 545 addr = (struct vhost_vring_addr) { 546 .index = vq, 547 .desc_user_addr = (u64)(unsigned long)queue->vring.desc, 548 .avail_user_addr = (u64)(unsigned long)queue->vring.avail, 549 .used_user_addr = (u64)(unsigned long)queue->vring.used, 550 }; 551 552 r = ioctl(ndev->vhost_fd, VHOST_SET_VRING_ADDR, &addr); 553 if (r < 0) 554 die_perror("VHOST_SET_VRING_ADDR failed"); 555 556 return 0; 557 } 558 559 static void notify_vq_gsi(struct kvm *kvm, void *dev, u32 vq, u32 gsi) 560 { 561 struct net_dev *ndev = dev; 562 struct kvm_irqfd irq; 563 struct vhost_vring_file file; 564 int r; 565 566 if (ndev->vhost_fd == 0) 567 return; 568 569 irq = (struct kvm_irqfd) { 570 .gsi = gsi, 571 .fd = eventfd(0, 0), 572 }; 573 file = (struct vhost_vring_file) { 574 .index = vq, 575 .fd = irq.fd, 576 }; 577 578 r = ioctl(kvm->vm_fd, KVM_IRQFD, &irq); 579 if (r < 0) 580 die_perror("KVM_IRQFD failed"); 581 582 r = ioctl(ndev->vhost_fd, VHOST_SET_VRING_CALL, &file); 583 if (r < 0) 584 die_perror("VHOST_SET_VRING_CALL failed"); 585 file.fd = ndev->tap_fd; 586 r = ioctl(ndev->vhost_fd, VHOST_NET_SET_BACKEND, &file); 587 if (r != 0) 588 die("VHOST_NET_SET_BACKEND failed %d", errno); 589 590 } 591 592 static void notify_vq_eventfd(struct kvm *kvm, void *dev, u32 vq, u32 efd) 593 { 594 struct net_dev *ndev = dev; 595 struct vhost_vring_file file = { 596 .index = vq, 597 .fd = efd, 598 }; 599 int r; 600 601 if (ndev->vhost_fd == 0 || is_ctrl_vq(ndev, vq)) 602 return; 603 604 r = ioctl(ndev->vhost_fd, VHOST_SET_VRING_KICK, &file); 605 if (r < 0) 606 die_perror("VHOST_SET_VRING_KICK failed"); 607 } 608 609 static int notify_vq(struct kvm *kvm, void *dev, u32 vq) 610 { 611 struct net_dev *ndev = dev; 612 613 virtio_net_handle_callback(kvm, ndev, vq); 614 615 return 0; 616 } 617 618 static int get_pfn_vq(struct kvm *kvm, void *dev, u32 vq) 619 { 620 struct net_dev *ndev = dev; 621 622 return ndev->vqs[vq].pfn; 623 } 624 625 static int get_size_vq(struct kvm *kvm, void *dev, u32 vq) 626 { 627 /* FIXME: dynamic */ 628 return VIRTIO_NET_QUEUE_SIZE; 629 } 630 631 static int set_size_vq(struct kvm *kvm, void *dev, u32 vq, int size) 632 { 633 /* FIXME: dynamic */ 634 return size; 635 } 636 637 static struct virtio_ops net_dev_virtio_ops = { 638 .get_config = get_config, 639 .get_host_features = get_host_features, 640 .set_guest_features = set_guest_features, 641 .init_vq = init_vq, 642 .get_pfn_vq = get_pfn_vq, 643 .get_size_vq = get_size_vq, 644 .set_size_vq = set_size_vq, 645 .notify_vq = notify_vq, 646 .notify_vq_gsi = notify_vq_gsi, 647 .notify_vq_eventfd = notify_vq_eventfd, 648 }; 649 650 static void virtio_net__vhost_init(struct kvm *kvm, struct net_dev *ndev) 651 { 652 struct kvm_mem_bank *bank; 653 struct vhost_memory *mem; 654 int r, i; 655 656 ndev->vhost_fd = open("/dev/vhost-net", O_RDWR); 657 if (ndev->vhost_fd < 0) 658 die_perror("Failed openning vhost-net device"); 659 660 mem = calloc(1, sizeof(*mem) + kvm->mem_slots * sizeof(struct vhost_memory_region)); 661 if (mem == NULL) 662 die("Failed allocating memory for vhost memory map"); 663 664 i = 0; 665 list_for_each_entry(bank, &kvm->mem_banks, list) { 666 mem->regions[i] = (struct vhost_memory_region) { 667 .guest_phys_addr = bank->guest_phys_addr, 668 .memory_size = bank->size, 669 .userspace_addr = (unsigned long)bank->host_addr, 670 }; 671 i++; 672 } 673 mem->nregions = i; 674 675 r = ioctl(ndev->vhost_fd, VHOST_SET_OWNER); 676 if (r != 0) 677 die_perror("VHOST_SET_OWNER failed"); 678 679 r = ioctl(ndev->vhost_fd, VHOST_SET_MEM_TABLE, mem); 680 if (r != 0) 681 die_perror("VHOST_SET_MEM_TABLE failed"); 682 683 ndev->vdev.use_vhost = true; 684 685 free(mem); 686 } 687 688 static inline void str_to_mac(const char *str, char *mac) 689 { 690 sscanf(str, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", 691 mac, mac+1, mac+2, mac+3, mac+4, mac+5); 692 } 693 static int set_net_param(struct kvm *kvm, struct virtio_net_params *p, 694 const char *param, const char *val) 695 { 696 if (strcmp(param, "guest_mac") == 0) { 697 str_to_mac(val, p->guest_mac); 698 } else if (strcmp(param, "mode") == 0) { 699 if (!strncmp(val, "user", 4)) { 700 int i; 701 702 for (i = 0; i < kvm->cfg.num_net_devices; i++) 703 if (kvm->cfg.net_params[i].mode == NET_MODE_USER) 704 die("Only one usermode network device allowed at a time"); 705 p->mode = NET_MODE_USER; 706 } else if (!strncmp(val, "tap", 3)) { 707 p->mode = NET_MODE_TAP; 708 } else if (!strncmp(val, "none", 4)) { 709 kvm->cfg.no_net = 1; 710 return -1; 711 } else 712 die("Unknown network mode %s, please use user, tap or none", kvm->cfg.network); 713 } else if (strcmp(param, "script") == 0) { 714 p->script = strdup(val); 715 } else if (strcmp(param, "downscript") == 0) { 716 p->downscript = strdup(val); 717 } else if (strcmp(param, "guest_ip") == 0) { 718 p->guest_ip = strdup(val); 719 } else if (strcmp(param, "host_ip") == 0) { 720 p->host_ip = strdup(val); 721 } else if (strcmp(param, "trans") == 0) { 722 p->trans = strdup(val); 723 } else if (strcmp(param, "tapif") == 0) { 724 p->tapif = strdup(val); 725 } else if (strcmp(param, "vhost") == 0) { 726 p->vhost = atoi(val); 727 } else if (strcmp(param, "fd") == 0) { 728 p->fd = atoi(val); 729 } else if (strcmp(param, "mq") == 0) { 730 p->mq = atoi(val); 731 } else 732 die("Unknown network parameter %s", param); 733 734 return 0; 735 } 736 737 int netdev_parser(const struct option *opt, const char *arg, int unset) 738 { 739 struct virtio_net_params p; 740 char *buf = NULL, *cmd = NULL, *cur = NULL; 741 bool on_cmd = true; 742 struct kvm *kvm = opt->ptr; 743 744 if (arg) { 745 buf = strdup(arg); 746 if (buf == NULL) 747 die("Failed allocating new net buffer"); 748 cur = strtok(buf, ",="); 749 } 750 751 p = (struct virtio_net_params) { 752 .guest_ip = DEFAULT_GUEST_ADDR, 753 .host_ip = DEFAULT_HOST_ADDR, 754 .script = DEFAULT_SCRIPT, 755 .downscript = DEFAULT_SCRIPT, 756 .mode = NET_MODE_TAP, 757 }; 758 759 str_to_mac(DEFAULT_GUEST_MAC, p.guest_mac); 760 p.guest_mac[5] += kvm->cfg.num_net_devices; 761 762 while (cur) { 763 if (on_cmd) { 764 cmd = cur; 765 } else { 766 if (set_net_param(kvm, &p, cmd, cur) < 0) 767 goto done; 768 } 769 on_cmd = !on_cmd; 770 771 cur = strtok(NULL, ",="); 772 }; 773 774 kvm->cfg.num_net_devices++; 775 776 kvm->cfg.net_params = realloc(kvm->cfg.net_params, kvm->cfg.num_net_devices * sizeof(*kvm->cfg.net_params)); 777 if (kvm->cfg.net_params == NULL) 778 die("Failed adding new network device"); 779 780 kvm->cfg.net_params[kvm->cfg.num_net_devices - 1] = p; 781 782 done: 783 free(buf); 784 return 0; 785 } 786 787 static int virtio_net__init_one(struct virtio_net_params *params) 788 { 789 int i, err; 790 struct net_dev *ndev; 791 struct virtio_ops *ops; 792 enum virtio_trans trans = VIRTIO_DEFAULT_TRANS(params->kvm); 793 794 ndev = calloc(1, sizeof(struct net_dev)); 795 if (ndev == NULL) 796 return -ENOMEM; 797 798 ops = malloc(sizeof(*ops)); 799 if (ops == NULL) { 800 err = -ENOMEM; 801 goto err_free_ndev; 802 } 803 804 list_add_tail(&ndev->list, &ndevs); 805 806 ndev->kvm = params->kvm; 807 ndev->params = params; 808 809 mutex_init(&ndev->mutex); 810 ndev->queue_pairs = max(1, min(VIRTIO_NET_NUM_QUEUES, params->mq)); 811 ndev->config.status = VIRTIO_NET_S_LINK_UP; 812 if (ndev->queue_pairs > 1) 813 ndev->config.max_virtqueue_pairs = ndev->queue_pairs; 814 815 for (i = 0 ; i < 6 ; i++) { 816 ndev->config.mac[i] = params->guest_mac[i]; 817 ndev->info.guest_mac.addr[i] = params->guest_mac[i]; 818 ndev->info.host_mac.addr[i] = params->host_mac[i]; 819 } 820 821 ndev->mode = params->mode; 822 if (ndev->mode == NET_MODE_TAP) { 823 ndev->ops = &tap_ops; 824 } else { 825 ndev->info.host_ip = ntohl(inet_addr(params->host_ip)); 826 ndev->info.guest_ip = ntohl(inet_addr(params->guest_ip)); 827 ndev->info.guest_netmask = ntohl(inet_addr("255.255.255.0")); 828 ndev->info.buf_nr = 20, 829 ndev->ops = &uip_ops; 830 uip_static_init(&ndev->info); 831 } 832 833 *ops = net_dev_virtio_ops; 834 835 if (params->trans) { 836 if (strcmp(params->trans, "mmio") == 0) 837 trans = VIRTIO_MMIO; 838 else if (strcmp(params->trans, "pci") == 0) 839 trans = VIRTIO_PCI; 840 else 841 pr_warning("virtio-net: Unknown transport method : %s, " 842 "falling back to %s.", params->trans, 843 virtio_trans_name(trans)); 844 } 845 846 virtio_init(params->kvm, ndev, &ndev->vdev, ops, trans, 847 PCI_DEVICE_ID_VIRTIO_NET, VIRTIO_ID_NET, PCI_CLASS_NET); 848 849 if (params->vhost) 850 virtio_net__vhost_init(params->kvm, ndev); 851 852 if (compat_id == -1) 853 compat_id = virtio_compat_add_message("virtio-net", "CONFIG_VIRTIO_NET"); 854 855 return 0; 856 857 err_free_ndev: 858 free(ndev); 859 return err; 860 } 861 862 int virtio_net__init(struct kvm *kvm) 863 { 864 int i; 865 866 for (i = 0; i < kvm->cfg.num_net_devices; i++) { 867 kvm->cfg.net_params[i].kvm = kvm; 868 virtio_net__init_one(&kvm->cfg.net_params[i]); 869 } 870 871 if (kvm->cfg.num_net_devices == 0 && kvm->cfg.no_net == 0) { 872 static struct virtio_net_params net_params; 873 874 net_params = (struct virtio_net_params) { 875 .guest_ip = kvm->cfg.guest_ip, 876 .host_ip = kvm->cfg.host_ip, 877 .kvm = kvm, 878 .script = kvm->cfg.script, 879 .mode = NET_MODE_USER, 880 }; 881 str_to_mac(kvm->cfg.guest_mac, net_params.guest_mac); 882 str_to_mac(kvm->cfg.host_mac, net_params.host_mac); 883 884 virtio_net__init_one(&net_params); 885 } 886 887 return 0; 888 } 889 virtio_dev_init(virtio_net__init); 890 891 int virtio_net__exit(struct kvm *kvm) 892 { 893 struct virtio_net_params *params; 894 struct net_dev *ndev; 895 struct list_head *ptr; 896 897 list_for_each(ptr, &ndevs) { 898 ndev = list_entry(ptr, struct net_dev, list); 899 params = ndev->params; 900 /* Cleanup any tap device which attached to bridge */ 901 if (ndev->mode == NET_MODE_TAP && 902 strcmp(params->downscript, "none")) 903 virtio_net_exec_script(params->downscript, ndev->tap_name); 904 } 905 return 0; 906 } 907 virtio_dev_exit(virtio_net__exit); 908