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 #include "kvm/strbuf.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_queue { 41 int id; 42 struct net_dev *ndev; 43 struct virt_queue vq; 44 pthread_t thread; 45 struct mutex lock; 46 pthread_cond_t cond; 47 int gsi; 48 int irqfd; 49 }; 50 51 struct net_dev { 52 struct mutex mutex; 53 struct virtio_device vdev; 54 struct list_head list; 55 56 struct net_dev_queue queues[VIRTIO_NET_NUM_QUEUES * 2 + 1]; 57 struct virtio_net_config config; 58 u32 queue_pairs; 59 60 int vhost_fd; 61 int tap_fd; 62 char tap_name[IFNAMSIZ]; 63 bool tap_ufo; 64 65 int mode; 66 67 struct uip_info info; 68 struct net_dev_operations *ops; 69 struct kvm *kvm; 70 71 struct virtio_net_params *params; 72 }; 73 74 static LIST_HEAD(ndevs); 75 static int compat_id = -1; 76 77 #define MAX_PACKET_SIZE 65550 78 79 static bool has_virtio_feature(struct net_dev *ndev, u32 feature) 80 { 81 return ndev->vdev.features & (1 << feature); 82 } 83 84 static int virtio_net_hdr_len(struct net_dev *ndev) 85 { 86 if (has_virtio_feature(ndev, VIRTIO_NET_F_MRG_RXBUF) || 87 !ndev->vdev.legacy) 88 return sizeof(struct virtio_net_hdr_mrg_rxbuf); 89 90 return sizeof(struct virtio_net_hdr); 91 } 92 93 static void *virtio_net_rx_thread(void *p) 94 { 95 struct iovec iov[VIRTIO_NET_QUEUE_SIZE]; 96 struct net_dev_queue *queue = p; 97 struct virt_queue *vq = &queue->vq; 98 struct net_dev *ndev = queue->ndev; 99 struct kvm *kvm; 100 u16 out, in; 101 u16 head; 102 int len, copied; 103 104 kvm__set_thread_name("virtio-net-rx"); 105 106 kvm = ndev->kvm; 107 while (1) { 108 mutex_lock(&queue->lock); 109 if (!virt_queue__available(vq)) 110 pthread_cond_wait(&queue->cond, &queue->lock.mutex); 111 mutex_unlock(&queue->lock); 112 113 while (virt_queue__available(vq)) { 114 unsigned char buffer[MAX_PACKET_SIZE + sizeof(struct virtio_net_hdr_mrg_rxbuf)]; 115 struct iovec dummy_iov = { 116 .iov_base = buffer, 117 .iov_len = sizeof(buffer), 118 }; 119 struct virtio_net_hdr_mrg_rxbuf *hdr; 120 u16 num_buffers; 121 122 len = ndev->ops->rx(&dummy_iov, 1, ndev); 123 if (len < 0) { 124 pr_warning("%s: rx on vq %u failed (%d), exiting thread\n", 125 __func__, queue->id, len); 126 goto out_err; 127 } 128 129 copied = num_buffers = 0; 130 head = virt_queue__get_iov(vq, iov, &out, &in, kvm); 131 hdr = iov[0].iov_base; 132 while (copied < len) { 133 size_t iovsize = min_t(size_t, len - copied, iov_size(iov, in)); 134 135 memcpy_toiovec(iov, buffer + copied, iovsize); 136 copied += iovsize; 137 virt_queue__set_used_elem_no_update(vq, head, iovsize, num_buffers++); 138 if (copied == len) 139 break; 140 while (!virt_queue__available(vq)) 141 sleep(0); 142 head = virt_queue__get_iov(vq, iov, &out, &in, kvm); 143 } 144 145 /* 146 * The device MUST set num_buffers, except in the case 147 * where the legacy driver did not negotiate 148 * VIRTIO_NET_F_MRG_RXBUF and the field does not exist. 149 */ 150 if (has_virtio_feature(ndev, VIRTIO_NET_F_MRG_RXBUF) || 151 !ndev->vdev.legacy) 152 hdr->num_buffers = virtio_host_to_guest_u16(vq, num_buffers); 153 154 virt_queue__used_idx_advance(vq, num_buffers); 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, queue->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 net_dev_queue *queue = p; 172 struct virt_queue *vq = &queue->vq; 173 struct net_dev *ndev = queue->ndev; 174 struct kvm *kvm; 175 u16 out, in; 176 u16 head; 177 int len; 178 179 kvm__set_thread_name("virtio-net-tx"); 180 181 kvm = ndev->kvm; 182 183 while (1) { 184 mutex_lock(&queue->lock); 185 if (!virt_queue__available(vq)) 186 pthread_cond_wait(&queue->cond, &queue->lock.mutex); 187 mutex_unlock(&queue->lock); 188 189 while (virt_queue__available(vq)) { 190 head = virt_queue__get_iov(vq, iov, &out, &in, kvm); 191 len = ndev->ops->tx(iov, out, ndev); 192 if (len < 0) { 193 pr_warning("%s: tx on vq %u failed (%d)\n", 194 __func__, queue->id, errno); 195 goto out_err; 196 } 197 198 virt_queue__set_used_elem(vq, head, len); 199 } 200 201 if (virtio_queue__should_signal(vq)) 202 ndev->vdev.ops->signal_vq(kvm, &ndev->vdev, queue->id); 203 } 204 205 out_err: 206 pthread_exit(NULL); 207 return NULL; 208 } 209 210 static virtio_net_ctrl_ack virtio_net_handle_mq(struct kvm* kvm, struct net_dev *ndev, struct virtio_net_ctrl_hdr *ctrl) 211 { 212 /* Not much to do here */ 213 return VIRTIO_NET_OK; 214 } 215 216 static void *virtio_net_ctrl_thread(void *p) 217 { 218 struct iovec iov[VIRTIO_NET_QUEUE_SIZE]; 219 struct net_dev_queue *queue = p; 220 struct virt_queue *vq = &queue->vq; 221 struct net_dev *ndev = queue->ndev; 222 u16 out, in, head; 223 struct kvm *kvm = ndev->kvm; 224 struct virtio_net_ctrl_hdr *ctrl; 225 virtio_net_ctrl_ack *ack; 226 227 kvm__set_thread_name("virtio-net-ctrl"); 228 229 while (1) { 230 mutex_lock(&queue->lock); 231 if (!virt_queue__available(vq)) 232 pthread_cond_wait(&queue->cond, &queue->lock.mutex); 233 mutex_unlock(&queue->lock); 234 235 while (virt_queue__available(vq)) { 236 head = virt_queue__get_iov(vq, iov, &out, &in, kvm); 237 ctrl = iov[0].iov_base; 238 ack = iov[out].iov_base; 239 240 switch (ctrl->class) { 241 case VIRTIO_NET_CTRL_MQ: 242 *ack = virtio_net_handle_mq(kvm, ndev, ctrl); 243 break; 244 default: 245 *ack = VIRTIO_NET_ERR; 246 break; 247 } 248 virt_queue__set_used_elem(vq, head, iov[out].iov_len); 249 } 250 251 if (virtio_queue__should_signal(vq)) 252 ndev->vdev.ops->signal_vq(kvm, &ndev->vdev, queue->id); 253 } 254 255 pthread_exit(NULL); 256 257 return NULL; 258 } 259 260 static void virtio_net_handle_callback(struct kvm *kvm, struct net_dev *ndev, int queue) 261 { 262 struct net_dev_queue *net_queue = &ndev->queues[queue]; 263 264 if ((u32)queue >= (ndev->queue_pairs * 2 + 1)) { 265 pr_warning("Unknown queue index %u", queue); 266 return; 267 } 268 269 mutex_lock(&net_queue->lock); 270 pthread_cond_signal(&net_queue->cond); 271 mutex_unlock(&net_queue->lock); 272 } 273 274 static int virtio_net_request_tap(struct net_dev *ndev, struct ifreq *ifr, 275 const char *tapname) 276 { 277 int ret; 278 279 memset(ifr, 0, sizeof(*ifr)); 280 ifr->ifr_flags = IFF_TAP | IFF_NO_PI | IFF_VNET_HDR; 281 if (tapname) 282 strlcpy(ifr->ifr_name, tapname, sizeof(ifr->ifr_name)); 283 284 ret = ioctl(ndev->tap_fd, TUNSETIFF, ifr); 285 286 if (ret >= 0) 287 strlcpy(ndev->tap_name, ifr->ifr_name, sizeof(ndev->tap_name)); 288 return ret; 289 } 290 291 static int virtio_net_exec_script(const char* script, const char *tap_name) 292 { 293 pid_t pid; 294 int status; 295 296 pid = fork(); 297 if (pid == 0) { 298 execl(script, script, tap_name, NULL); 299 _exit(1); 300 } else { 301 waitpid(pid, &status, 0); 302 if (WIFEXITED(status) && WEXITSTATUS(status) != 0) { 303 pr_warning("Fail to setup tap by %s", script); 304 return -1; 305 } 306 } 307 return 0; 308 } 309 310 static bool virtio_net__tap_init(struct net_dev *ndev) 311 { 312 int sock = socket(AF_INET, SOCK_STREAM, 0); 313 int hdr_len; 314 struct sockaddr_in sin = {0}; 315 struct ifreq ifr; 316 const struct virtio_net_params *params = ndev->params; 317 bool skipconf = !!params->tapif; 318 319 hdr_len = virtio_net_hdr_len(ndev); 320 if (ioctl(ndev->tap_fd, TUNSETVNETHDRSZ, &hdr_len) < 0) 321 pr_warning("Config tap device TUNSETVNETHDRSZ error"); 322 323 if (strcmp(params->script, "none")) { 324 if (virtio_net_exec_script(params->script, ndev->tap_name) < 0) 325 goto fail; 326 } else if (!skipconf) { 327 memset(&ifr, 0, sizeof(ifr)); 328 strncpy(ifr.ifr_name, ndev->tap_name, sizeof(ifr.ifr_name)); 329 sin.sin_addr.s_addr = inet_addr(params->host_ip); 330 memcpy(&(ifr.ifr_addr), &sin, sizeof(ifr.ifr_addr)); 331 ifr.ifr_addr.sa_family = AF_INET; 332 if (ioctl(sock, SIOCSIFADDR, &ifr) < 0) { 333 pr_warning("Could not set ip address on tap device"); 334 goto fail; 335 } 336 } 337 338 if (!skipconf) { 339 memset(&ifr, 0, sizeof(ifr)); 340 strncpy(ifr.ifr_name, ndev->tap_name, sizeof(ifr.ifr_name)); 341 ioctl(sock, SIOCGIFFLAGS, &ifr); 342 ifr.ifr_flags |= IFF_UP | IFF_RUNNING; 343 if (ioctl(sock, SIOCSIFFLAGS, &ifr) < 0) 344 pr_warning("Could not bring tap device up"); 345 } 346 347 close(sock); 348 349 return 1; 350 351 fail: 352 if (sock >= 0) 353 close(sock); 354 if (ndev->tap_fd >= 0) 355 close(ndev->tap_fd); 356 357 return 0; 358 } 359 360 static void virtio_net__tap_exit(struct net_dev *ndev) 361 { 362 int sock; 363 struct ifreq ifr; 364 365 if (ndev->params->tapif) 366 return; 367 368 sock = socket(AF_INET, SOCK_STREAM, 0); 369 strncpy(ifr.ifr_name, ndev->tap_name, sizeof(ifr.ifr_name)); 370 ioctl(sock, SIOCGIFFLAGS, &ifr); 371 ifr.ifr_flags &= ~(IFF_UP | IFF_RUNNING); 372 if (ioctl(sock, SIOCGIFFLAGS, &ifr) < 0) 373 pr_warning("Count not bring tap device down"); 374 close(sock); 375 } 376 377 static bool virtio_net__tap_create(struct net_dev *ndev) 378 { 379 int offload; 380 struct ifreq ifr; 381 const struct virtio_net_params *params = ndev->params; 382 bool macvtap = (!!params->tapif) && (params->tapif[0] == '/'); 383 384 /* Did the user already gave us the FD? */ 385 if (params->fd) 386 ndev->tap_fd = params->fd; 387 else { 388 const char *tap_file = "/dev/net/tun"; 389 390 /* Did the user ask us to use macvtap? */ 391 if (macvtap) 392 tap_file = params->tapif; 393 394 ndev->tap_fd = open(tap_file, O_RDWR); 395 if (ndev->tap_fd < 0) { 396 pr_warning("Unable to open %s", tap_file); 397 return 0; 398 } 399 } 400 401 if (!macvtap && 402 virtio_net_request_tap(ndev, &ifr, params->tapif) < 0) { 403 pr_warning("Config tap device error. Are you root?"); 404 goto fail; 405 } 406 407 /* 408 * The UFO support had been removed from kernel in commit: 409 * ID: fb652fdfe83710da0ca13448a41b7ed027d0a984 410 * https://www.spinics.net/lists/netdev/msg443562.html 411 * In oder to support the older kernels without this commit, 412 * we set the TUN_F_UFO to offload by default to test the status of 413 * UFO kernel support. 414 */ 415 ndev->tap_ufo = true; 416 offload = TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6 | TUN_F_UFO; 417 if (ioctl(ndev->tap_fd, TUNSETOFFLOAD, offload) < 0) { 418 /* 419 * Is this failure caused by kernel remove the UFO support? 420 * Try TUNSETOFFLOAD without TUN_F_UFO. 421 */ 422 offload &= ~TUN_F_UFO; 423 if (ioctl(ndev->tap_fd, TUNSETOFFLOAD, offload) < 0) { 424 pr_warning("Config tap device TUNSETOFFLOAD error"); 425 goto fail; 426 } 427 ndev->tap_ufo = false; 428 } 429 430 return 1; 431 432 fail: 433 if ((ndev->tap_fd >= 0) || (!params->fd) ) 434 close(ndev->tap_fd); 435 436 return 0; 437 } 438 439 static inline int tap_ops_tx(struct iovec *iov, u16 out, struct net_dev *ndev) 440 { 441 return writev(ndev->tap_fd, iov, out); 442 } 443 444 static inline int tap_ops_rx(struct iovec *iov, u16 in, struct net_dev *ndev) 445 { 446 return readv(ndev->tap_fd, iov, in); 447 } 448 449 static inline int uip_ops_tx(struct iovec *iov, u16 out, struct net_dev *ndev) 450 { 451 return uip_tx(iov, out, &ndev->info); 452 } 453 454 static inline int uip_ops_rx(struct iovec *iov, u16 in, struct net_dev *ndev) 455 { 456 return uip_rx(iov, in, &ndev->info); 457 } 458 459 static struct net_dev_operations tap_ops = { 460 .rx = tap_ops_rx, 461 .tx = tap_ops_tx, 462 }; 463 464 static struct net_dev_operations uip_ops = { 465 .rx = uip_ops_rx, 466 .tx = uip_ops_tx, 467 }; 468 469 static u8 *get_config(struct kvm *kvm, void *dev) 470 { 471 struct net_dev *ndev = dev; 472 473 return ((u8 *)(&ndev->config)); 474 } 475 476 static size_t get_config_size(struct kvm *kvm, void *dev) 477 { 478 struct net_dev *ndev = dev; 479 480 return sizeof(ndev->config); 481 } 482 483 static u32 get_host_features(struct kvm *kvm, void *dev) 484 { 485 u32 features; 486 struct net_dev *ndev = dev; 487 488 features = 1UL << VIRTIO_NET_F_MAC 489 | 1UL << VIRTIO_NET_F_CSUM 490 | 1UL << VIRTIO_NET_F_HOST_TSO4 491 | 1UL << VIRTIO_NET_F_HOST_TSO6 492 | 1UL << VIRTIO_NET_F_GUEST_TSO4 493 | 1UL << VIRTIO_NET_F_GUEST_TSO6 494 | 1UL << VIRTIO_RING_F_EVENT_IDX 495 | 1UL << VIRTIO_RING_F_INDIRECT_DESC 496 | 1UL << VIRTIO_NET_F_CTRL_VQ 497 | 1UL << VIRTIO_NET_F_MRG_RXBUF 498 | 1UL << (ndev->queue_pairs > 1 ? VIRTIO_NET_F_MQ : 0); 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 return features; 509 } 510 511 static int virtio_net__vhost_set_features(struct net_dev *ndev) 512 { 513 u64 features = 1UL << VIRTIO_RING_F_EVENT_IDX; 514 u64 vhost_features; 515 516 if (ioctl(ndev->vhost_fd, VHOST_GET_FEATURES, &vhost_features) != 0) 517 die_perror("VHOST_GET_FEATURES failed"); 518 519 /* make sure both side support mergable rx buffers */ 520 if (vhost_features & 1UL << VIRTIO_NET_F_MRG_RXBUF && 521 has_virtio_feature(ndev, VIRTIO_NET_F_MRG_RXBUF)) 522 features |= 1UL << VIRTIO_NET_F_MRG_RXBUF; 523 524 return ioctl(ndev->vhost_fd, VHOST_SET_FEATURES, &features); 525 } 526 527 static void virtio_net_start(struct net_dev *ndev) 528 { 529 if (ndev->mode == NET_MODE_TAP) { 530 if (!virtio_net__tap_init(ndev)) 531 die_perror("TAP device initialized failed because"); 532 533 if (ndev->vhost_fd && 534 virtio_net__vhost_set_features(ndev) != 0) 535 die_perror("VHOST_SET_FEATURES failed"); 536 } else { 537 ndev->info.vnet_hdr_len = virtio_net_hdr_len(ndev); 538 uip_init(&ndev->info); 539 } 540 } 541 542 static void virtio_net_stop(struct net_dev *ndev) 543 { 544 /* Undo whatever start() did */ 545 if (ndev->mode == NET_MODE_TAP) 546 virtio_net__tap_exit(ndev); 547 else 548 uip_exit(&ndev->info); 549 } 550 551 static void virtio_net_update_endian(struct net_dev *ndev) 552 { 553 struct virtio_net_config *conf = &ndev->config; 554 555 conf->status = virtio_host_to_guest_u16(&ndev->vdev, 556 VIRTIO_NET_S_LINK_UP); 557 conf->max_virtqueue_pairs = virtio_host_to_guest_u16(&ndev->vdev, 558 ndev->queue_pairs); 559 560 /* Let TAP know about vnet header endianness */ 561 if (ndev->mode == NET_MODE_TAP && 562 ndev->vdev.endian != VIRTIO_ENDIAN_HOST) { 563 int enable_val = 1, disable_val = 0; 564 int enable_req, disable_req; 565 566 if (ndev->vdev.endian == VIRTIO_ENDIAN_LE) { 567 enable_req = TUNSETVNETLE; 568 disable_req = TUNSETVNETBE; 569 } else { 570 enable_req = TUNSETVNETBE; 571 disable_req = TUNSETVNETLE; 572 } 573 574 ioctl(ndev->tap_fd, disable_req, &disable_val); 575 if (ioctl(ndev->tap_fd, enable_req, &enable_val) < 0) 576 pr_err("Config tap device TUNSETVNETLE/BE error"); 577 } 578 } 579 580 static void notify_status(struct kvm *kvm, void *dev, u32 status) 581 { 582 struct net_dev *ndev = dev; 583 584 if (status & VIRTIO__STATUS_CONFIG) 585 virtio_net_update_endian(ndev); 586 587 if (status & VIRTIO__STATUS_START) 588 virtio_net_start(dev); 589 else if (status & VIRTIO__STATUS_STOP) 590 virtio_net_stop(dev); 591 } 592 593 static bool is_ctrl_vq(struct net_dev *ndev, u32 vq) 594 { 595 return vq == (u32)(ndev->queue_pairs * 2); 596 } 597 598 static int init_vq(struct kvm *kvm, void *dev, u32 vq) 599 { 600 struct vhost_vring_state state = { .index = vq }; 601 struct net_dev_queue *net_queue; 602 struct vhost_vring_addr addr; 603 struct net_dev *ndev = dev; 604 struct virt_queue *queue; 605 int r; 606 607 compat__remove_message(compat_id); 608 609 net_queue = &ndev->queues[vq]; 610 net_queue->id = vq; 611 net_queue->ndev = ndev; 612 queue = &net_queue->vq; 613 virtio_init_device_vq(kvm, &ndev->vdev, queue, VIRTIO_NET_QUEUE_SIZE); 614 615 mutex_init(&net_queue->lock); 616 pthread_cond_init(&net_queue->cond, NULL); 617 if (is_ctrl_vq(ndev, vq)) { 618 pthread_create(&net_queue->thread, NULL, virtio_net_ctrl_thread, 619 net_queue); 620 621 return 0; 622 } else if (ndev->vhost_fd == 0 ) { 623 if (vq & 1) 624 pthread_create(&net_queue->thread, NULL, 625 virtio_net_tx_thread, net_queue); 626 else 627 pthread_create(&net_queue->thread, NULL, 628 virtio_net_rx_thread, net_queue); 629 630 return 0; 631 } 632 633 if (queue->endian != VIRTIO_ENDIAN_HOST) 634 die_perror("VHOST requires the same endianness in guest and host"); 635 636 state.num = queue->vring.num; 637 r = ioctl(ndev->vhost_fd, VHOST_SET_VRING_NUM, &state); 638 if (r < 0) 639 die_perror("VHOST_SET_VRING_NUM failed"); 640 state.num = 0; 641 r = ioctl(ndev->vhost_fd, VHOST_SET_VRING_BASE, &state); 642 if (r < 0) 643 die_perror("VHOST_SET_VRING_BASE failed"); 644 645 addr = (struct vhost_vring_addr) { 646 .index = vq, 647 .desc_user_addr = (u64)(unsigned long)queue->vring.desc, 648 .avail_user_addr = (u64)(unsigned long)queue->vring.avail, 649 .used_user_addr = (u64)(unsigned long)queue->vring.used, 650 }; 651 652 r = ioctl(ndev->vhost_fd, VHOST_SET_VRING_ADDR, &addr); 653 if (r < 0) 654 die_perror("VHOST_SET_VRING_ADDR failed"); 655 656 return 0; 657 } 658 659 static void exit_vq(struct kvm *kvm, void *dev, u32 vq) 660 { 661 struct net_dev *ndev = dev; 662 struct net_dev_queue *queue = &ndev->queues[vq]; 663 664 if (!is_ctrl_vq(ndev, vq) && queue->gsi) { 665 irq__del_irqfd(kvm, queue->gsi, queue->irqfd); 666 close(queue->irqfd); 667 queue->gsi = queue->irqfd = 0; 668 } 669 670 /* 671 * TODO: vhost reset owner. It's the only way to cleanly stop vhost, but 672 * we can't restart it at the moment. 673 */ 674 if (ndev->vhost_fd && !is_ctrl_vq(ndev, vq)) { 675 pr_warning("Cannot reset VHOST queue"); 676 ioctl(ndev->vhost_fd, VHOST_RESET_OWNER); 677 return; 678 } 679 680 /* 681 * Threads are waiting on cancellation points (readv or 682 * pthread_cond_wait) and should stop gracefully. 683 */ 684 pthread_cancel(queue->thread); 685 pthread_join(queue->thread, NULL); 686 } 687 688 static void notify_vq_gsi(struct kvm *kvm, void *dev, u32 vq, u32 gsi) 689 { 690 struct net_dev *ndev = dev; 691 struct net_dev_queue *queue = &ndev->queues[vq]; 692 struct vhost_vring_file file; 693 int r; 694 695 if (ndev->vhost_fd == 0) 696 return; 697 698 file = (struct vhost_vring_file) { 699 .index = vq, 700 .fd = eventfd(0, 0), 701 }; 702 703 r = irq__add_irqfd(kvm, gsi, file.fd, -1); 704 if (r < 0) 705 die_perror("KVM_IRQFD failed"); 706 707 queue->irqfd = file.fd; 708 queue->gsi = gsi; 709 710 r = ioctl(ndev->vhost_fd, VHOST_SET_VRING_CALL, &file); 711 if (r < 0) 712 die_perror("VHOST_SET_VRING_CALL failed"); 713 file.fd = ndev->tap_fd; 714 r = ioctl(ndev->vhost_fd, VHOST_NET_SET_BACKEND, &file); 715 if (r != 0) 716 die("VHOST_NET_SET_BACKEND failed %d", errno); 717 718 } 719 720 static void notify_vq_eventfd(struct kvm *kvm, void *dev, u32 vq, u32 efd) 721 { 722 struct net_dev *ndev = dev; 723 struct vhost_vring_file file = { 724 .index = vq, 725 .fd = efd, 726 }; 727 int r; 728 729 if (ndev->vhost_fd == 0 || is_ctrl_vq(ndev, vq)) 730 return; 731 732 r = ioctl(ndev->vhost_fd, VHOST_SET_VRING_KICK, &file); 733 if (r < 0) 734 die_perror("VHOST_SET_VRING_KICK failed"); 735 } 736 737 static int notify_vq(struct kvm *kvm, void *dev, u32 vq) 738 { 739 struct net_dev *ndev = dev; 740 741 virtio_net_handle_callback(kvm, ndev, vq); 742 743 return 0; 744 } 745 746 static struct virt_queue *get_vq(struct kvm *kvm, void *dev, u32 vq) 747 { 748 struct net_dev *ndev = dev; 749 750 return &ndev->queues[vq].vq; 751 } 752 753 static int get_size_vq(struct kvm *kvm, void *dev, u32 vq) 754 { 755 /* FIXME: dynamic */ 756 return VIRTIO_NET_QUEUE_SIZE; 757 } 758 759 static int set_size_vq(struct kvm *kvm, void *dev, u32 vq, int size) 760 { 761 /* FIXME: dynamic */ 762 return size; 763 } 764 765 static unsigned int get_vq_count(struct kvm *kvm, void *dev) 766 { 767 struct net_dev *ndev = dev; 768 769 return ndev->queue_pairs * 2 + 1; 770 } 771 772 static struct virtio_ops net_dev_virtio_ops = { 773 .get_config = get_config, 774 .get_config_size = get_config_size, 775 .get_host_features = get_host_features, 776 .get_vq_count = get_vq_count, 777 .init_vq = init_vq, 778 .exit_vq = exit_vq, 779 .get_vq = get_vq, 780 .get_size_vq = get_size_vq, 781 .set_size_vq = set_size_vq, 782 .notify_vq = notify_vq, 783 .notify_vq_gsi = notify_vq_gsi, 784 .notify_vq_eventfd = notify_vq_eventfd, 785 .notify_status = notify_status, 786 }; 787 788 static void virtio_net__vhost_init(struct kvm *kvm, struct net_dev *ndev) 789 { 790 struct kvm_mem_bank *bank; 791 struct vhost_memory *mem; 792 int r, i; 793 794 ndev->vhost_fd = open("/dev/vhost-net", O_RDWR); 795 if (ndev->vhost_fd < 0) 796 die_perror("Failed openning vhost-net device"); 797 798 mem = calloc(1, sizeof(*mem) + kvm->mem_slots * sizeof(struct vhost_memory_region)); 799 if (mem == NULL) 800 die("Failed allocating memory for vhost memory map"); 801 802 i = 0; 803 list_for_each_entry(bank, &kvm->mem_banks, list) { 804 mem->regions[i] = (struct vhost_memory_region) { 805 .guest_phys_addr = bank->guest_phys_addr, 806 .memory_size = bank->size, 807 .userspace_addr = (unsigned long)bank->host_addr, 808 }; 809 i++; 810 } 811 mem->nregions = i; 812 813 r = ioctl(ndev->vhost_fd, VHOST_SET_OWNER); 814 if (r != 0) 815 die_perror("VHOST_SET_OWNER failed"); 816 817 r = ioctl(ndev->vhost_fd, VHOST_SET_MEM_TABLE, mem); 818 if (r != 0) 819 die_perror("VHOST_SET_MEM_TABLE failed"); 820 821 ndev->vdev.use_vhost = true; 822 823 free(mem); 824 } 825 826 static inline void str_to_mac(const char *str, char *mac) 827 { 828 sscanf(str, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", 829 mac, mac+1, mac+2, mac+3, mac+4, mac+5); 830 } 831 static int set_net_param(struct kvm *kvm, struct virtio_net_params *p, 832 const char *param, const char *val) 833 { 834 if (strcmp(param, "guest_mac") == 0) { 835 str_to_mac(val, p->guest_mac); 836 } else if (strcmp(param, "mode") == 0) { 837 if (!strncmp(val, "user", 4)) { 838 int i; 839 840 for (i = 0; i < kvm->cfg.num_net_devices; i++) 841 if (kvm->cfg.net_params[i].mode == NET_MODE_USER) 842 die("Only one usermode network device allowed at a time"); 843 p->mode = NET_MODE_USER; 844 } else if (!strncmp(val, "tap", 3)) { 845 p->mode = NET_MODE_TAP; 846 } else if (!strncmp(val, "none", 4)) { 847 kvm->cfg.no_net = 1; 848 return -1; 849 } else 850 die("Unknown network mode %s, please use user, tap or none", kvm->cfg.network); 851 } else if (strcmp(param, "script") == 0) { 852 p->script = strdup(val); 853 } else if (strcmp(param, "downscript") == 0) { 854 p->downscript = strdup(val); 855 } else if (strcmp(param, "guest_ip") == 0) { 856 p->guest_ip = strdup(val); 857 } else if (strcmp(param, "host_ip") == 0) { 858 p->host_ip = strdup(val); 859 } else if (strcmp(param, "trans") == 0) { 860 p->trans = strdup(val); 861 } else if (strcmp(param, "tapif") == 0) { 862 p->tapif = strdup(val); 863 } else if (strcmp(param, "vhost") == 0) { 864 p->vhost = atoi(val); 865 } else if (strcmp(param, "fd") == 0) { 866 p->fd = atoi(val); 867 } else if (strcmp(param, "mq") == 0) { 868 p->mq = atoi(val); 869 } else 870 die("Unknown network parameter %s", param); 871 872 return 0; 873 } 874 875 int netdev_parser(const struct option *opt, const char *arg, int unset) 876 { 877 struct virtio_net_params p; 878 char *buf = NULL, *cmd = NULL, *cur = NULL; 879 bool on_cmd = true; 880 struct kvm *kvm = opt->ptr; 881 882 if (arg) { 883 buf = strdup(arg); 884 if (buf == NULL) 885 die("Failed allocating new net buffer"); 886 cur = strtok(buf, ",="); 887 } 888 889 p = (struct virtio_net_params) { 890 .guest_ip = DEFAULT_GUEST_ADDR, 891 .host_ip = DEFAULT_HOST_ADDR, 892 .script = DEFAULT_SCRIPT, 893 .downscript = DEFAULT_SCRIPT, 894 .mode = NET_MODE_TAP, 895 }; 896 897 str_to_mac(DEFAULT_GUEST_MAC, p.guest_mac); 898 p.guest_mac[5] += kvm->cfg.num_net_devices; 899 900 while (cur) { 901 if (on_cmd) { 902 cmd = cur; 903 } else { 904 if (set_net_param(kvm, &p, cmd, cur) < 0) 905 goto done; 906 } 907 on_cmd = !on_cmd; 908 909 cur = strtok(NULL, ",="); 910 }; 911 912 kvm->cfg.num_net_devices++; 913 914 kvm->cfg.net_params = realloc(kvm->cfg.net_params, kvm->cfg.num_net_devices * sizeof(*kvm->cfg.net_params)); 915 if (kvm->cfg.net_params == NULL) 916 die("Failed adding new network device"); 917 918 kvm->cfg.net_params[kvm->cfg.num_net_devices - 1] = p; 919 920 done: 921 free(buf); 922 return 0; 923 } 924 925 static int virtio_net__init_one(struct virtio_net_params *params) 926 { 927 int i, r; 928 struct net_dev *ndev; 929 struct virtio_ops *ops; 930 enum virtio_trans trans = VIRTIO_DEFAULT_TRANS(params->kvm); 931 932 ndev = calloc(1, sizeof(struct net_dev)); 933 if (ndev == NULL) 934 return -ENOMEM; 935 936 list_add_tail(&ndev->list, &ndevs); 937 938 ops = malloc(sizeof(*ops)); 939 if (ops == NULL) 940 return -ENOMEM; 941 942 ndev->kvm = params->kvm; 943 ndev->params = params; 944 945 mutex_init(&ndev->mutex); 946 ndev->queue_pairs = max(1, min(VIRTIO_NET_NUM_QUEUES, params->mq)); 947 948 for (i = 0 ; i < 6 ; i++) { 949 ndev->config.mac[i] = params->guest_mac[i]; 950 ndev->info.guest_mac.addr[i] = params->guest_mac[i]; 951 ndev->info.host_mac.addr[i] = params->host_mac[i]; 952 } 953 954 ndev->mode = params->mode; 955 if (ndev->mode == NET_MODE_TAP) { 956 ndev->ops = &tap_ops; 957 if (!virtio_net__tap_create(ndev)) 958 die_perror("You have requested a TAP device, but creation of one has failed because"); 959 } else { 960 ndev->info.host_ip = ntohl(inet_addr(params->host_ip)); 961 ndev->info.guest_ip = ntohl(inet_addr(params->guest_ip)); 962 ndev->info.guest_netmask = ntohl(inet_addr("255.255.255.0")); 963 ndev->info.buf_nr = 20, 964 ndev->ops = &uip_ops; 965 uip_static_init(&ndev->info); 966 } 967 968 *ops = net_dev_virtio_ops; 969 970 if (params->trans) { 971 if (strcmp(params->trans, "mmio") == 0) 972 trans = VIRTIO_MMIO; 973 else if (strcmp(params->trans, "pci") == 0) 974 trans = VIRTIO_PCI; 975 else 976 pr_warning("virtio-net: Unknown transport method : %s, " 977 "falling back to %s.", params->trans, 978 virtio_trans_name(trans)); 979 } 980 981 r = virtio_init(params->kvm, ndev, &ndev->vdev, ops, trans, 982 PCI_DEVICE_ID_VIRTIO_NET, VIRTIO_ID_NET, PCI_CLASS_NET); 983 if (r < 0) { 984 free(ops); 985 return r; 986 } 987 988 if (params->vhost) 989 virtio_net__vhost_init(params->kvm, ndev); 990 991 if (compat_id == -1) 992 compat_id = virtio_compat_add_message("virtio-net", "CONFIG_VIRTIO_NET"); 993 994 return 0; 995 } 996 997 int virtio_net__init(struct kvm *kvm) 998 { 999 int i, r; 1000 1001 for (i = 0; i < kvm->cfg.num_net_devices; i++) { 1002 kvm->cfg.net_params[i].kvm = kvm; 1003 r = virtio_net__init_one(&kvm->cfg.net_params[i]); 1004 if (r < 0) 1005 goto cleanup; 1006 } 1007 1008 if (kvm->cfg.num_net_devices == 0 && kvm->cfg.no_net == 0) { 1009 static struct virtio_net_params net_params; 1010 1011 net_params = (struct virtio_net_params) { 1012 .guest_ip = kvm->cfg.guest_ip, 1013 .host_ip = kvm->cfg.host_ip, 1014 .kvm = kvm, 1015 .script = kvm->cfg.script, 1016 .mode = NET_MODE_USER, 1017 }; 1018 str_to_mac(kvm->cfg.guest_mac, net_params.guest_mac); 1019 str_to_mac(kvm->cfg.host_mac, net_params.host_mac); 1020 1021 r = virtio_net__init_one(&net_params); 1022 if (r < 0) 1023 goto cleanup; 1024 } 1025 1026 return 0; 1027 1028 cleanup: 1029 virtio_net__exit(kvm); 1030 return r; 1031 } 1032 virtio_dev_init(virtio_net__init); 1033 1034 int virtio_net__exit(struct kvm *kvm) 1035 { 1036 struct virtio_net_params *params; 1037 struct net_dev *ndev; 1038 struct list_head *ptr, *n; 1039 1040 list_for_each_safe(ptr, n, &ndevs) { 1041 ndev = list_entry(ptr, struct net_dev, list); 1042 params = ndev->params; 1043 /* Cleanup any tap device which attached to bridge */ 1044 if (ndev->mode == NET_MODE_TAP && 1045 strcmp(params->downscript, "none")) 1046 virtio_net_exec_script(params->downscript, ndev->tap_name); 1047 1048 list_del(&ndev->list); 1049 free(ndev); 1050 } 1051 return 0; 1052 } 1053 virtio_dev_exit(virtio_net__exit); 1054