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/uip.h" 8 #include "kvm/guest_compat.h" 9 #include "kvm/iovec.h" 10 #include "kvm/strbuf.h" 11 12 #include <linux/list.h> 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 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_queue { 40 int id; 41 struct net_dev *ndev; 42 struct virt_queue vq; 43 pthread_t thread; 44 struct mutex lock; 45 pthread_cond_t cond; 46 }; 47 48 struct net_dev { 49 struct mutex mutex; 50 struct virtio_device vdev; 51 struct list_head list; 52 53 struct net_dev_queue queues[VIRTIO_NET_NUM_QUEUES * 2 + 1]; 54 struct virtio_net_config config; 55 u32 queue_pairs; 56 57 int vhost_fd; 58 int tap_fd; 59 char tap_name[IFNAMSIZ]; 60 bool tap_ufo; 61 62 int mode; 63 64 struct uip_info info; 65 struct net_dev_operations *ops; 66 struct kvm *kvm; 67 68 struct virtio_net_params *params; 69 }; 70 71 static LIST_HEAD(ndevs); 72 static int compat_id = -1; 73 74 #define MAX_PACKET_SIZE 65550 75 76 static bool has_virtio_feature(struct net_dev *ndev, u32 feature) 77 { 78 return ndev->vdev.features & (1 << feature); 79 } 80 81 static int virtio_net_hdr_len(struct net_dev *ndev) 82 { 83 if (has_virtio_feature(ndev, VIRTIO_NET_F_MRG_RXBUF) || 84 !ndev->vdev.legacy) 85 return sizeof(struct virtio_net_hdr_mrg_rxbuf); 86 87 return sizeof(struct virtio_net_hdr); 88 } 89 90 static void *virtio_net_rx_thread(void *p) 91 { 92 struct iovec iov[VIRTIO_NET_QUEUE_SIZE]; 93 struct net_dev_queue *queue = p; 94 struct virt_queue *vq = &queue->vq; 95 struct net_dev *ndev = queue->ndev; 96 struct kvm *kvm; 97 u16 out, in; 98 u16 head; 99 int len, copied; 100 101 kvm__set_thread_name("virtio-net-rx"); 102 103 kvm = ndev->kvm; 104 while (1) { 105 mutex_lock(&queue->lock); 106 if (!virt_queue__available(vq)) 107 pthread_cond_wait(&queue->cond, &queue->lock.mutex); 108 mutex_unlock(&queue->lock); 109 110 while (virt_queue__available(vq)) { 111 unsigned char buffer[MAX_PACKET_SIZE + sizeof(struct virtio_net_hdr_mrg_rxbuf)]; 112 struct iovec dummy_iov = { 113 .iov_base = buffer, 114 .iov_len = sizeof(buffer), 115 }; 116 struct virtio_net_hdr_mrg_rxbuf *hdr; 117 u16 num_buffers; 118 119 len = ndev->ops->rx(&dummy_iov, 1, ndev); 120 if (len < 0) { 121 pr_warning("%s: rx on vq %u failed (%d), exiting thread\n", 122 __func__, queue->id, len); 123 goto out_err; 124 } 125 126 copied = num_buffers = 0; 127 head = virt_queue__get_iov(vq, iov, &out, &in, kvm); 128 hdr = iov[0].iov_base; 129 while (copied < len) { 130 size_t iovsize = min_t(size_t, len - copied, iov_size(iov, in)); 131 132 memcpy_toiovec(iov, buffer + copied, iovsize); 133 copied += iovsize; 134 virt_queue__set_used_elem_no_update(vq, head, iovsize, num_buffers++); 135 if (copied == len) 136 break; 137 while (!virt_queue__available(vq)) 138 sleep(0); 139 head = virt_queue__get_iov(vq, iov, &out, &in, kvm); 140 } 141 142 /* 143 * The device MUST set num_buffers, except in the case 144 * where the legacy driver did not negotiate 145 * VIRTIO_NET_F_MRG_RXBUF and the field does not exist. 146 */ 147 if (has_virtio_feature(ndev, VIRTIO_NET_F_MRG_RXBUF) || 148 !ndev->vdev.legacy) 149 hdr->num_buffers = virtio_host_to_guest_u16(vq->endian, num_buffers); 150 151 virt_queue__used_idx_advance(vq, num_buffers); 152 153 /* We should interrupt guest right now, otherwise latency is huge. */ 154 if (virtio_queue__should_signal(vq)) 155 ndev->vdev.ops->signal_vq(kvm, &ndev->vdev, queue->id); 156 } 157 } 158 159 out_err: 160 pthread_exit(NULL); 161 return NULL; 162 163 } 164 165 static void *virtio_net_tx_thread(void *p) 166 { 167 struct iovec iov[VIRTIO_NET_QUEUE_SIZE]; 168 struct net_dev_queue *queue = p; 169 struct virt_queue *vq = &queue->vq; 170 struct net_dev *ndev = queue->ndev; 171 struct kvm *kvm; 172 u16 out, in; 173 u16 head; 174 int len; 175 176 kvm__set_thread_name("virtio-net-tx"); 177 178 kvm = ndev->kvm; 179 180 while (1) { 181 mutex_lock(&queue->lock); 182 if (!virt_queue__available(vq)) 183 pthread_cond_wait(&queue->cond, &queue->lock.mutex); 184 mutex_unlock(&queue->lock); 185 186 while (virt_queue__available(vq)) { 187 head = virt_queue__get_iov(vq, iov, &out, &in, kvm); 188 len = ndev->ops->tx(iov, out, ndev); 189 if (len < 0) { 190 pr_warning("%s: tx on vq %u failed (%d)\n", 191 __func__, queue->id, errno); 192 goto out_err; 193 } 194 195 virt_queue__set_used_elem(vq, head, len); 196 } 197 198 if (virtio_queue__should_signal(vq)) 199 ndev->vdev.ops->signal_vq(kvm, &ndev->vdev, queue->id); 200 } 201 202 out_err: 203 pthread_exit(NULL); 204 return NULL; 205 } 206 207 static virtio_net_ctrl_ack virtio_net_handle_mq(struct kvm* kvm, struct net_dev *ndev, struct virtio_net_ctrl_hdr *ctrl) 208 { 209 /* Not much to do here */ 210 return VIRTIO_NET_OK; 211 } 212 213 static void *virtio_net_ctrl_thread(void *p) 214 { 215 struct iovec iov[VIRTIO_NET_QUEUE_SIZE]; 216 struct net_dev_queue *queue = p; 217 struct virt_queue *vq = &queue->vq; 218 struct net_dev *ndev = queue->ndev; 219 u16 out, in, head; 220 struct kvm *kvm = ndev->kvm; 221 struct virtio_net_ctrl_hdr ctrl; 222 virtio_net_ctrl_ack ack; 223 size_t len; 224 225 kvm__set_thread_name("virtio-net-ctrl"); 226 227 while (1) { 228 mutex_lock(&queue->lock); 229 if (!virt_queue__available(vq)) 230 pthread_cond_wait(&queue->cond, &queue->lock.mutex); 231 mutex_unlock(&queue->lock); 232 233 while (virt_queue__available(vq)) { 234 head = virt_queue__get_iov(vq, iov, &out, &in, kvm); 235 len = min(iov_size(iov, in), sizeof(ctrl)); 236 memcpy_fromiovec((void *)&ctrl, iov, len); 237 238 switch (ctrl.class) { 239 case VIRTIO_NET_CTRL_MQ: 240 ack = virtio_net_handle_mq(kvm, ndev, &ctrl); 241 break; 242 default: 243 ack = VIRTIO_NET_ERR; 244 break; 245 } 246 memcpy_toiovec(iov + in, &ack, sizeof(ack)); 247 virt_queue__set_used_elem(vq, head, sizeof(ack)); 248 } 249 250 if (virtio_queue__should_signal(vq)) 251 ndev->vdev.ops->signal_vq(kvm, &ndev->vdev, queue->id); 252 } 253 254 pthread_exit(NULL); 255 256 return NULL; 257 } 258 259 static void virtio_net_handle_callback(struct kvm *kvm, struct net_dev *ndev, int queue) 260 { 261 struct net_dev_queue *net_queue = &ndev->queues[queue]; 262 263 if ((u32)queue >= (ndev->queue_pairs * 2 + 1)) { 264 pr_warning("Unknown queue index %u", queue); 265 return; 266 } 267 268 mutex_lock(&net_queue->lock); 269 pthread_cond_signal(&net_queue->cond); 270 mutex_unlock(&net_queue->lock); 271 } 272 273 static int virtio_net_request_tap(struct net_dev *ndev, struct ifreq *ifr, 274 const char *tapname) 275 { 276 int ret; 277 278 memset(ifr, 0, sizeof(*ifr)); 279 ifr->ifr_flags = IFF_TAP | IFF_NO_PI | IFF_VNET_HDR; 280 if (tapname) 281 strlcpy(ifr->ifr_name, tapname, sizeof(ifr->ifr_name)); 282 283 ret = ioctl(ndev->tap_fd, TUNSETIFF, ifr); 284 285 if (ret >= 0) 286 strlcpy(ndev->tap_name, ifr->ifr_name, sizeof(ndev->tap_name)); 287 return ret; 288 } 289 290 static int virtio_net_exec_script(const char* script, const char *tap_name) 291 { 292 pid_t pid; 293 int status; 294 295 pid = vfork(); 296 if (pid == 0) { 297 execl(script, script, tap_name, NULL); 298 _exit(1); 299 } else { 300 waitpid(pid, &status, 0); 301 if (WIFEXITED(status) && WEXITSTATUS(status) != 0) { 302 pr_warning("Fail to setup tap by %s", script); 303 return -1; 304 } 305 } 306 return 0; 307 } 308 309 static bool virtio_net__tap_init(struct net_dev *ndev) 310 { 311 int sock = socket(AF_INET, SOCK_STREAM, 0); 312 int hdr_len; 313 struct sockaddr_in sin = {0}; 314 struct ifreq ifr; 315 const struct virtio_net_params *params = ndev->params; 316 bool skipconf = !!params->tapif; 317 318 hdr_len = virtio_net_hdr_len(ndev); 319 if (ioctl(ndev->tap_fd, TUNSETVNETHDRSZ, &hdr_len) < 0) 320 pr_warning("Config tap device TUNSETVNETHDRSZ error"); 321 322 if (strcmp(params->script, "none")) { 323 if (virtio_net_exec_script(params->script, ndev->tap_name) < 0) 324 goto fail; 325 } else if (!skipconf) { 326 memset(&ifr, 0, sizeof(ifr)); 327 strncpy(ifr.ifr_name, ndev->tap_name, sizeof(ifr.ifr_name)); 328 sin.sin_addr.s_addr = inet_addr(params->host_ip); 329 memcpy(&(ifr.ifr_addr), &sin, sizeof(ifr.ifr_addr)); 330 ifr.ifr_addr.sa_family = AF_INET; 331 if (ioctl(sock, SIOCSIFADDR, &ifr) < 0) { 332 pr_warning("Could not set ip address on tap device"); 333 goto fail; 334 } 335 } 336 337 if (!skipconf) { 338 memset(&ifr, 0, sizeof(ifr)); 339 strncpy(ifr.ifr_name, ndev->tap_name, sizeof(ifr.ifr_name)); 340 ioctl(sock, SIOCGIFFLAGS, &ifr); 341 ifr.ifr_flags |= IFF_UP | IFF_RUNNING; 342 if (ioctl(sock, SIOCSIFFLAGS, &ifr) < 0) 343 pr_warning("Could not bring tap device up"); 344 } 345 346 close(sock); 347 348 return 1; 349 350 fail: 351 if (sock >= 0) 352 close(sock); 353 if (ndev->tap_fd >= 0) 354 close(ndev->tap_fd); 355 356 return 0; 357 } 358 359 static void virtio_net__tap_exit(struct net_dev *ndev) 360 { 361 int sock; 362 struct ifreq ifr; 363 364 if (ndev->params->tapif) 365 return; 366 367 sock = socket(AF_INET, SOCK_STREAM, 0); 368 strncpy(ifr.ifr_name, ndev->tap_name, sizeof(ifr.ifr_name)); 369 ioctl(sock, SIOCGIFFLAGS, &ifr); 370 ifr.ifr_flags &= ~(IFF_UP | IFF_RUNNING); 371 if (ioctl(sock, SIOCGIFFLAGS, &ifr) < 0) 372 pr_warning("Count not bring tap device down"); 373 close(sock); 374 } 375 376 static bool virtio_net__tap_create(struct net_dev *ndev) 377 { 378 int offload; 379 struct ifreq ifr; 380 const struct virtio_net_params *params = ndev->params; 381 bool macvtap = (!!params->tapif) && (params->tapif[0] == '/'); 382 383 /* Did the user already gave us the FD? */ 384 if (params->fd) 385 ndev->tap_fd = params->fd; 386 else { 387 const char *tap_file = "/dev/net/tun"; 388 389 /* Did the user ask us to use macvtap? */ 390 if (macvtap) 391 tap_file = params->tapif; 392 393 ndev->tap_fd = open(tap_file, O_RDWR); 394 if (ndev->tap_fd < 0) { 395 pr_warning("Unable to open %s", tap_file); 396 return 0; 397 } 398 } 399 400 if (!macvtap && 401 virtio_net_request_tap(ndev, &ifr, params->tapif) < 0) { 402 pr_warning("Config tap device error. Are you root?"); 403 goto fail; 404 } 405 406 /* 407 * The UFO support had been removed from kernel in commit: 408 * ID: fb652fdfe83710da0ca13448a41b7ed027d0a984 409 * https://www.spinics.net/lists/netdev/msg443562.html 410 * In oder to support the older kernels without this commit, 411 * we set the TUN_F_UFO to offload by default to test the status of 412 * UFO kernel support. 413 */ 414 ndev->tap_ufo = true; 415 offload = TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6 | TUN_F_UFO; 416 if (ioctl(ndev->tap_fd, TUNSETOFFLOAD, offload) < 0) { 417 /* 418 * Is this failure caused by kernel remove the UFO support? 419 * Try TUNSETOFFLOAD without TUN_F_UFO. 420 */ 421 offload &= ~TUN_F_UFO; 422 if (ioctl(ndev->tap_fd, TUNSETOFFLOAD, offload) < 0) { 423 pr_warning("Config tap device TUNSETOFFLOAD error"); 424 goto fail; 425 } 426 ndev->tap_ufo = false; 427 } 428 429 return 1; 430 431 fail: 432 if ((ndev->tap_fd >= 0) || (!params->fd) ) 433 close(ndev->tap_fd); 434 435 return 0; 436 } 437 438 static inline int tap_ops_tx(struct iovec *iov, u16 out, struct net_dev *ndev) 439 { 440 return writev(ndev->tap_fd, iov, out); 441 } 442 443 static inline int tap_ops_rx(struct iovec *iov, u16 in, struct net_dev *ndev) 444 { 445 return readv(ndev->tap_fd, iov, in); 446 } 447 448 static inline int uip_ops_tx(struct iovec *iov, u16 out, struct net_dev *ndev) 449 { 450 return uip_tx(iov, out, &ndev->info); 451 } 452 453 static inline int uip_ops_rx(struct iovec *iov, u16 in, struct net_dev *ndev) 454 { 455 return uip_rx(iov, in, &ndev->info); 456 } 457 458 static struct net_dev_operations tap_ops = { 459 .rx = tap_ops_rx, 460 .tx = tap_ops_tx, 461 }; 462 463 static struct net_dev_operations uip_ops = { 464 .rx = uip_ops_rx, 465 .tx = uip_ops_tx, 466 }; 467 468 static u8 *get_config(struct kvm *kvm, void *dev) 469 { 470 struct net_dev *ndev = dev; 471 472 return ((u8 *)(&ndev->config)); 473 } 474 475 static size_t get_config_size(struct kvm *kvm, void *dev) 476 { 477 struct net_dev *ndev = dev; 478 479 return sizeof(ndev->config); 480 } 481 482 static u64 get_host_features(struct kvm *kvm, void *dev) 483 { 484 u64 features; 485 struct net_dev *ndev = dev; 486 487 features = 1UL << VIRTIO_NET_F_MAC 488 | 1UL << VIRTIO_NET_F_CSUM 489 | 1UL << VIRTIO_NET_F_HOST_TSO4 490 | 1UL << VIRTIO_NET_F_HOST_TSO6 491 | 1UL << VIRTIO_NET_F_GUEST_TSO4 492 | 1UL << VIRTIO_NET_F_GUEST_TSO6 493 | 1UL << VIRTIO_RING_F_EVENT_IDX 494 | 1UL << VIRTIO_RING_F_INDIRECT_DESC 495 | 1UL << VIRTIO_NET_F_CTRL_VQ 496 | 1UL << VIRTIO_NET_F_MRG_RXBUF 497 | 1UL << (ndev->queue_pairs > 1 ? VIRTIO_NET_F_MQ : 0) 498 | 1UL << VIRTIO_F_ANY_LAYOUT; 499 500 /* 501 * The UFO feature for host and guest only can be enabled when the 502 * kernel has TAP UFO support. 503 */ 504 if (ndev->tap_ufo) 505 features |= (1UL << VIRTIO_NET_F_HOST_UFO 506 | 1UL << VIRTIO_NET_F_GUEST_UFO); 507 508 if (ndev->vhost_fd) { 509 u64 vhost_features; 510 511 if (ioctl(ndev->vhost_fd, VHOST_GET_FEATURES, &vhost_features) != 0) 512 die_perror("VHOST_GET_FEATURES failed"); 513 514 features &= vhost_features; 515 } 516 517 return features; 518 } 519 520 static void virtio_net_start(struct net_dev *ndev) 521 { 522 /* VHOST_NET_F_VIRTIO_NET_HDR clashes with VIRTIO_F_ANY_LAYOUT! */ 523 u64 features = ndev->vdev.features & ~(1UL << VHOST_NET_F_VIRTIO_NET_HDR); 524 525 if (ndev->mode == NET_MODE_TAP) { 526 if (!virtio_net__tap_init(ndev)) 527 die_perror("TAP device initialized failed because"); 528 529 if (ndev->vhost_fd && virtio_vhost_set_features(ndev->vhost_fd, 530 features)) 531 die_perror("VHOST_SET_FEATURES failed"); 532 } else { 533 ndev->info.vnet_hdr_len = virtio_net_hdr_len(ndev); 534 uip_init(&ndev->info); 535 } 536 } 537 538 static void virtio_net_stop(struct net_dev *ndev) 539 { 540 /* Undo whatever start() did */ 541 if (ndev->mode == NET_MODE_TAP) 542 virtio_net__tap_exit(ndev); 543 else 544 uip_exit(&ndev->info); 545 } 546 547 static void virtio_net_update_endian(struct net_dev *ndev) 548 { 549 struct virtio_net_config *conf = &ndev->config; 550 551 conf->status = virtio_host_to_guest_u16(ndev->vdev.endian, 552 VIRTIO_NET_S_LINK_UP); 553 conf->max_virtqueue_pairs = virtio_host_to_guest_u16(ndev->vdev.endian, 554 ndev->queue_pairs); 555 556 /* Let TAP know about vnet header endianness */ 557 if (ndev->mode == NET_MODE_TAP && 558 ndev->vdev.endian != VIRTIO_ENDIAN_HOST) { 559 int enable_val = 1, disable_val = 0; 560 int enable_req, disable_req; 561 562 if (ndev->vdev.endian == VIRTIO_ENDIAN_LE) { 563 enable_req = TUNSETVNETLE; 564 disable_req = TUNSETVNETBE; 565 } else { 566 enable_req = TUNSETVNETBE; 567 disable_req = TUNSETVNETLE; 568 } 569 570 ioctl(ndev->tap_fd, disable_req, &disable_val); 571 if (ioctl(ndev->tap_fd, enable_req, &enable_val) < 0) 572 pr_err("Config tap device TUNSETVNETLE/BE error"); 573 } 574 } 575 576 static void notify_status(struct kvm *kvm, void *dev, u32 status) 577 { 578 struct net_dev *ndev = dev; 579 580 if (status & VIRTIO__STATUS_CONFIG) 581 virtio_net_update_endian(ndev); 582 583 if (status & VIRTIO__STATUS_START) 584 virtio_net_start(dev); 585 else if (status & VIRTIO__STATUS_STOP) 586 virtio_net_stop(dev); 587 } 588 589 static bool is_ctrl_vq(struct net_dev *ndev, u32 vq) 590 { 591 return vq == (u32)(ndev->queue_pairs * 2); 592 } 593 594 static int init_vq(struct kvm *kvm, void *dev, u32 vq) 595 { 596 struct vhost_vring_file file = { .index = vq }; 597 struct net_dev_queue *net_queue; 598 struct net_dev *ndev = dev; 599 struct virt_queue *queue; 600 int r; 601 602 compat__remove_message(compat_id); 603 604 net_queue = &ndev->queues[vq]; 605 net_queue->id = vq; 606 net_queue->ndev = ndev; 607 queue = &net_queue->vq; 608 virtio_init_device_vq(kvm, &ndev->vdev, queue, VIRTIO_NET_QUEUE_SIZE); 609 610 mutex_init(&net_queue->lock); 611 pthread_cond_init(&net_queue->cond, NULL); 612 if (is_ctrl_vq(ndev, vq)) { 613 pthread_create(&net_queue->thread, NULL, virtio_net_ctrl_thread, 614 net_queue); 615 616 return 0; 617 } else if (ndev->vhost_fd == 0 ) { 618 if (vq & 1) 619 pthread_create(&net_queue->thread, NULL, 620 virtio_net_tx_thread, net_queue); 621 else 622 pthread_create(&net_queue->thread, NULL, 623 virtio_net_rx_thread, net_queue); 624 625 return 0; 626 } 627 628 virtio_vhost_set_vring(kvm, ndev->vhost_fd, vq, queue); 629 630 file.fd = ndev->tap_fd; 631 r = ioctl(ndev->vhost_fd, VHOST_NET_SET_BACKEND, &file); 632 if (r < 0) 633 die_perror("VHOST_NET_SET_BACKEND failed"); 634 635 return 0; 636 } 637 638 static void exit_vq(struct kvm *kvm, void *dev, u32 vq) 639 { 640 struct net_dev *ndev = dev; 641 struct net_dev_queue *queue = &ndev->queues[vq]; 642 643 virtio_vhost_reset_vring(kvm, ndev->vhost_fd, vq, &queue->vq); 644 645 /* 646 * TODO: vhost reset owner. It's the only way to cleanly stop vhost, but 647 * we can't restart it at the moment. 648 */ 649 if (ndev->vhost_fd && !is_ctrl_vq(ndev, vq)) { 650 pr_warning("Cannot reset VHOST queue"); 651 ioctl(ndev->vhost_fd, VHOST_RESET_OWNER); 652 return; 653 } 654 655 /* 656 * Threads are waiting on cancellation points (readv or 657 * pthread_cond_wait) and should stop gracefully. 658 */ 659 pthread_cancel(queue->thread); 660 pthread_join(queue->thread, NULL); 661 } 662 663 static void notify_vq_gsi(struct kvm *kvm, void *dev, u32 vq, u32 gsi) 664 { 665 struct net_dev *ndev = dev; 666 struct net_dev_queue *queue = &ndev->queues[vq]; 667 668 if (ndev->vhost_fd == 0 || is_ctrl_vq(ndev, vq)) 669 return; 670 671 virtio_vhost_set_vring_irqfd(kvm, gsi, &queue->vq); 672 } 673 674 static void notify_vq_eventfd(struct kvm *kvm, void *dev, u32 vq, u32 efd) 675 { 676 struct net_dev *ndev = dev; 677 678 if (ndev->vhost_fd == 0 || is_ctrl_vq(ndev, vq)) 679 return; 680 681 virtio_vhost_set_vring_kick(kvm, ndev->vhost_fd, vq, efd); 682 } 683 684 static int notify_vq(struct kvm *kvm, void *dev, u32 vq) 685 { 686 struct net_dev *ndev = dev; 687 688 virtio_net_handle_callback(kvm, ndev, vq); 689 690 return 0; 691 } 692 693 static struct virt_queue *get_vq(struct kvm *kvm, void *dev, u32 vq) 694 { 695 struct net_dev *ndev = dev; 696 697 return &ndev->queues[vq].vq; 698 } 699 700 static int get_size_vq(struct kvm *kvm, void *dev, u32 vq) 701 { 702 /* FIXME: dynamic */ 703 return VIRTIO_NET_QUEUE_SIZE; 704 } 705 706 static int set_size_vq(struct kvm *kvm, void *dev, u32 vq, int size) 707 { 708 /* FIXME: dynamic */ 709 return size; 710 } 711 712 static unsigned int get_vq_count(struct kvm *kvm, void *dev) 713 { 714 struct net_dev *ndev = dev; 715 716 return ndev->queue_pairs * 2 + 1; 717 } 718 719 static struct virtio_ops net_dev_virtio_ops = { 720 .get_config = get_config, 721 .get_config_size = get_config_size, 722 .get_host_features = get_host_features, 723 .get_vq_count = get_vq_count, 724 .init_vq = init_vq, 725 .exit_vq = exit_vq, 726 .get_vq = get_vq, 727 .get_size_vq = get_size_vq, 728 .set_size_vq = set_size_vq, 729 .notify_vq = notify_vq, 730 .notify_vq_gsi = notify_vq_gsi, 731 .notify_vq_eventfd = notify_vq_eventfd, 732 .notify_status = notify_status, 733 }; 734 735 static void virtio_net__vhost_init(struct kvm *kvm, struct net_dev *ndev) 736 { 737 if (ndev->queue_pairs > 1) { 738 pr_warning("multiqueue is not supported with vhost yet"); 739 return; 740 } 741 742 ndev->vhost_fd = open("/dev/vhost-net", O_RDWR); 743 if (ndev->vhost_fd < 0) 744 die_perror("Failed openning vhost-net device"); 745 746 virtio_vhost_init(kvm, ndev->vhost_fd); 747 748 ndev->vdev.use_vhost = true; 749 } 750 751 static inline void str_to_mac(const char *str, char *mac) 752 { 753 sscanf(str, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", 754 mac, mac+1, mac+2, mac+3, mac+4, mac+5); 755 } 756 static int set_net_param(struct kvm *kvm, struct virtio_net_params *p, 757 const char *param, const char *val) 758 { 759 if (strcmp(param, "guest_mac") == 0) { 760 str_to_mac(val, p->guest_mac); 761 } else if (strcmp(param, "mode") == 0) { 762 if (!strncmp(val, "user", 4)) { 763 int i; 764 765 for (i = 0; i < kvm->cfg.num_net_devices; i++) 766 if (kvm->cfg.net_params[i].mode == NET_MODE_USER) 767 die("Only one usermode network device allowed at a time"); 768 p->mode = NET_MODE_USER; 769 } else if (!strncmp(val, "tap", 3)) { 770 p->mode = NET_MODE_TAP; 771 } else if (!strncmp(val, "none", 4)) { 772 kvm->cfg.no_net = 1; 773 return -1; 774 } else 775 die("Unknown network mode %s, please use user, tap or none", kvm->cfg.network); 776 } else if (strcmp(param, "script") == 0) { 777 p->script = strdup(val); 778 } else if (strcmp(param, "downscript") == 0) { 779 p->downscript = strdup(val); 780 } else if (strcmp(param, "guest_ip") == 0) { 781 p->guest_ip = strdup(val); 782 } else if (strcmp(param, "host_ip") == 0) { 783 p->host_ip = strdup(val); 784 } else if (strcmp(param, "trans") == 0) { 785 p->trans = strdup(val); 786 } else if (strcmp(param, "tapif") == 0) { 787 p->tapif = strdup(val); 788 } else if (strcmp(param, "vhost") == 0) { 789 p->vhost = atoi(val); 790 } else if (strcmp(param, "fd") == 0) { 791 p->fd = atoi(val); 792 } else if (strcmp(param, "mq") == 0) { 793 p->mq = atoi(val); 794 } else 795 die("Unknown network parameter %s", param); 796 797 return 0; 798 } 799 800 int netdev_parser(const struct option *opt, const char *arg, int unset) 801 { 802 struct virtio_net_params p; 803 char *buf = NULL, *cmd = NULL, *cur = NULL; 804 bool on_cmd = true; 805 struct kvm *kvm = opt->ptr; 806 807 if (arg) { 808 buf = strdup(arg); 809 if (buf == NULL) 810 die("Failed allocating new net buffer"); 811 cur = strtok(buf, ",="); 812 } 813 814 p = (struct virtio_net_params) { 815 .guest_ip = DEFAULT_GUEST_ADDR, 816 .host_ip = DEFAULT_HOST_ADDR, 817 .script = DEFAULT_SCRIPT, 818 .downscript = DEFAULT_SCRIPT, 819 .mode = NET_MODE_TAP, 820 }; 821 822 str_to_mac(DEFAULT_GUEST_MAC, p.guest_mac); 823 p.guest_mac[5] += kvm->cfg.num_net_devices; 824 825 while (cur) { 826 if (on_cmd) { 827 cmd = cur; 828 } else { 829 if (set_net_param(kvm, &p, cmd, cur) < 0) 830 goto done; 831 } 832 on_cmd = !on_cmd; 833 834 cur = strtok(NULL, ",="); 835 }; 836 837 kvm->cfg.num_net_devices++; 838 839 kvm->cfg.net_params = realloc(kvm->cfg.net_params, kvm->cfg.num_net_devices * sizeof(*kvm->cfg.net_params)); 840 if (kvm->cfg.net_params == NULL) 841 die("Failed adding new network device"); 842 843 kvm->cfg.net_params[kvm->cfg.num_net_devices - 1] = p; 844 845 done: 846 free(buf); 847 return 0; 848 } 849 850 static int virtio_net__init_one(struct virtio_net_params *params) 851 { 852 enum virtio_trans trans = params->kvm->cfg.virtio_transport; 853 struct net_dev *ndev; 854 struct virtio_ops *ops; 855 int i, r; 856 857 ndev = calloc(1, sizeof(struct net_dev)); 858 if (ndev == NULL) 859 return -ENOMEM; 860 861 list_add_tail(&ndev->list, &ndevs); 862 863 ops = malloc(sizeof(*ops)); 864 if (ops == NULL) 865 return -ENOMEM; 866 867 ndev->kvm = params->kvm; 868 ndev->params = params; 869 870 mutex_init(&ndev->mutex); 871 ndev->queue_pairs = max(1, min(VIRTIO_NET_NUM_QUEUES, params->mq)); 872 873 for (i = 0 ; i < 6 ; i++) { 874 ndev->config.mac[i] = params->guest_mac[i]; 875 ndev->info.guest_mac.addr[i] = params->guest_mac[i]; 876 ndev->info.host_mac.addr[i] = params->host_mac[i]; 877 } 878 879 ndev->mode = params->mode; 880 if (ndev->mode == NET_MODE_TAP) { 881 ndev->ops = &tap_ops; 882 if (!virtio_net__tap_create(ndev)) 883 die_perror("You have requested a TAP device, but creation of one has failed because"); 884 } else { 885 ndev->info.host_ip = ntohl(inet_addr(params->host_ip)); 886 ndev->info.guest_ip = ntohl(inet_addr(params->guest_ip)); 887 ndev->info.guest_netmask = ntohl(inet_addr("255.255.255.0")); 888 ndev->info.buf_nr = 20, 889 ndev->ops = &uip_ops; 890 uip_static_init(&ndev->info); 891 } 892 893 *ops = net_dev_virtio_ops; 894 895 if (params->trans) { 896 if (strcmp(params->trans, "mmio") == 0) 897 trans = VIRTIO_MMIO; 898 else if (strcmp(params->trans, "pci") == 0) 899 trans = VIRTIO_PCI; 900 else 901 pr_warning("virtio-net: Unknown transport method : %s, " 902 "falling back to %s.", params->trans, 903 virtio_trans_name(trans)); 904 } 905 906 r = virtio_init(params->kvm, ndev, &ndev->vdev, ops, trans, 907 PCI_DEVICE_ID_VIRTIO_NET, VIRTIO_ID_NET, PCI_CLASS_NET); 908 if (r < 0) { 909 free(ops); 910 return r; 911 } 912 913 if (params->vhost) 914 virtio_net__vhost_init(params->kvm, ndev); 915 916 if (compat_id == -1) 917 compat_id = virtio_compat_add_message("virtio-net", "CONFIG_VIRTIO_NET"); 918 919 return 0; 920 } 921 922 int virtio_net__init(struct kvm *kvm) 923 { 924 int i, r; 925 926 for (i = 0; i < kvm->cfg.num_net_devices; i++) { 927 kvm->cfg.net_params[i].kvm = kvm; 928 r = virtio_net__init_one(&kvm->cfg.net_params[i]); 929 if (r < 0) 930 goto cleanup; 931 } 932 933 if (kvm->cfg.num_net_devices == 0 && kvm->cfg.no_net == 0) { 934 static struct virtio_net_params net_params; 935 936 net_params = (struct virtio_net_params) { 937 .guest_ip = kvm->cfg.guest_ip, 938 .host_ip = kvm->cfg.host_ip, 939 .kvm = kvm, 940 .script = kvm->cfg.script, 941 .mode = NET_MODE_USER, 942 }; 943 str_to_mac(kvm->cfg.guest_mac, net_params.guest_mac); 944 str_to_mac(kvm->cfg.host_mac, net_params.host_mac); 945 946 r = virtio_net__init_one(&net_params); 947 if (r < 0) 948 goto cleanup; 949 } 950 951 return 0; 952 953 cleanup: 954 virtio_net__exit(kvm); 955 return r; 956 } 957 virtio_dev_init(virtio_net__init); 958 959 int virtio_net__exit(struct kvm *kvm) 960 { 961 struct virtio_net_params *params; 962 struct net_dev *ndev; 963 struct list_head *ptr, *n; 964 965 list_for_each_safe(ptr, n, &ndevs) { 966 ndev = list_entry(ptr, struct net_dev, list); 967 params = ndev->params; 968 /* Cleanup any tap device which attached to bridge */ 969 if (ndev->mode == NET_MODE_TAP && 970 strcmp(params->downscript, "none")) 971 virtio_net_exec_script(params->downscript, ndev->tap_name); 972 973 list_del(&ndev->list); 974 free(ndev); 975 } 976 return 0; 977 } 978 virtio_dev_exit(virtio_net__exit); 979