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/virtio-trans.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 <assert.h> 23 #include <fcntl.h> 24 25 #include <sys/socket.h> 26 #include <sys/ioctl.h> 27 #include <sys/types.h> 28 #include <sys/wait.h> 29 #include <sys/eventfd.h> 30 31 #define VIRTIO_NET_QUEUE_SIZE 128 32 #define VIRTIO_NET_NUM_QUEUES 2 33 #define VIRTIO_NET_RX_QUEUE 0 34 #define VIRTIO_NET_TX_QUEUE 1 35 36 struct net_dev; 37 38 extern struct kvm *kvm; 39 40 struct net_dev_operations { 41 int (*rx)(struct iovec *iov, u16 in, struct net_dev *ndev); 42 int (*tx)(struct iovec *iov, u16 in, struct net_dev *ndev); 43 }; 44 45 struct net_dev { 46 pthread_mutex_t mutex; 47 struct virtio_trans vtrans; 48 struct list_head list; 49 50 struct virt_queue vqs[VIRTIO_NET_NUM_QUEUES]; 51 struct virtio_net_config config; 52 u32 features; 53 54 pthread_t io_rx_thread; 55 pthread_mutex_t io_rx_lock; 56 pthread_cond_t io_rx_cond; 57 58 pthread_t io_tx_thread; 59 pthread_mutex_t io_tx_lock; 60 pthread_cond_t io_tx_cond; 61 62 int vhost_fd; 63 int tap_fd; 64 char tap_name[IFNAMSIZ]; 65 66 int mode; 67 68 struct uip_info info; 69 struct net_dev_operations *ops; 70 struct kvm *kvm; 71 }; 72 73 static LIST_HEAD(ndevs); 74 static int compat_id = -1; 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; 85 86 kvm = ndev->kvm; 87 vq = &ndev->vqs[VIRTIO_NET_RX_QUEUE]; 88 89 while (1) { 90 91 mutex_lock(&ndev->io_rx_lock); 92 if (!virt_queue__available(vq)) 93 pthread_cond_wait(&ndev->io_rx_cond, &ndev->io_rx_lock); 94 mutex_unlock(&ndev->io_rx_lock); 95 96 while (virt_queue__available(vq)) { 97 98 head = virt_queue__get_iov(vq, iov, &out, &in, kvm); 99 100 len = ndev->ops->rx(iov, in, ndev); 101 102 virt_queue__set_used_elem(vq, head, len); 103 104 /* We should interrupt guest right now, otherwise latency is huge. */ 105 if (virtio_queue__should_signal(&ndev->vqs[VIRTIO_NET_RX_QUEUE])) 106 ndev->vtrans.trans_ops->signal_vq(kvm, &ndev->vtrans, 107 VIRTIO_NET_RX_QUEUE); 108 } 109 110 } 111 112 pthread_exit(NULL); 113 return NULL; 114 115 } 116 117 static void *virtio_net_tx_thread(void *p) 118 { 119 struct iovec iov[VIRTIO_NET_QUEUE_SIZE]; 120 struct virt_queue *vq; 121 struct kvm *kvm; 122 struct net_dev *ndev = p; 123 u16 out, in; 124 u16 head; 125 int len; 126 127 kvm = ndev->kvm; 128 vq = &ndev->vqs[VIRTIO_NET_TX_QUEUE]; 129 130 while (1) { 131 mutex_lock(&ndev->io_tx_lock); 132 if (!virt_queue__available(vq)) 133 pthread_cond_wait(&ndev->io_tx_cond, &ndev->io_tx_lock); 134 mutex_unlock(&ndev->io_tx_lock); 135 136 while (virt_queue__available(vq)) { 137 138 head = virt_queue__get_iov(vq, iov, &out, &in, kvm); 139 140 len = ndev->ops->tx(iov, out, ndev); 141 142 virt_queue__set_used_elem(vq, head, len); 143 } 144 145 if (virtio_queue__should_signal(&ndev->vqs[VIRTIO_NET_TX_QUEUE])) 146 ndev->vtrans.trans_ops->signal_vq(kvm, &ndev->vtrans, VIRTIO_NET_TX_QUEUE); 147 } 148 149 pthread_exit(NULL); 150 151 return NULL; 152 153 } 154 155 static void virtio_net_handle_callback(struct kvm *kvm, struct net_dev *ndev, int queue) 156 { 157 switch (queue) { 158 case VIRTIO_NET_TX_QUEUE: 159 mutex_lock(&ndev->io_tx_lock); 160 pthread_cond_signal(&ndev->io_tx_cond); 161 mutex_unlock(&ndev->io_tx_lock); 162 break; 163 case VIRTIO_NET_RX_QUEUE: 164 mutex_lock(&ndev->io_rx_lock); 165 pthread_cond_signal(&ndev->io_rx_cond); 166 mutex_unlock(&ndev->io_rx_lock); 167 break; 168 default: 169 pr_warning("Unknown queue index %u", queue); 170 } 171 } 172 173 static bool virtio_net__tap_init(const struct virtio_net_params *params, 174 struct net_dev *ndev) 175 { 176 int sock = socket(AF_INET, SOCK_STREAM, 0); 177 int pid, status, offload, hdr_len; 178 struct sockaddr_in sin = {0}; 179 struct ifreq ifr; 180 181 ndev->tap_fd = open("/dev/net/tun", O_RDWR); 182 if (ndev->tap_fd < 0) { 183 pr_warning("Unable to open /dev/net/tun"); 184 goto fail; 185 } 186 187 memset(&ifr, 0, sizeof(ifr)); 188 ifr.ifr_flags = IFF_TAP | IFF_NO_PI | IFF_VNET_HDR; 189 if (ioctl(ndev->tap_fd, TUNSETIFF, &ifr) < 0) { 190 pr_warning("Config tap device error. Are you root?"); 191 goto fail; 192 } 193 194 strncpy(ndev->tap_name, ifr.ifr_name, sizeof(ndev->tap_name)); 195 196 if (ioctl(ndev->tap_fd, TUNSETNOCSUM, 1) < 0) { 197 pr_warning("Config tap device TUNSETNOCSUM error"); 198 goto fail; 199 } 200 201 hdr_len = sizeof(struct virtio_net_hdr); 202 if (ioctl(ndev->tap_fd, TUNSETVNETHDRSZ, &hdr_len) < 0) 203 pr_warning("Config tap device TUNSETVNETHDRSZ error"); 204 205 offload = TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6 | TUN_F_UFO; 206 if (ioctl(ndev->tap_fd, TUNSETOFFLOAD, offload) < 0) { 207 pr_warning("Config tap device TUNSETOFFLOAD error"); 208 goto fail; 209 } 210 211 if (strcmp(params->script, "none")) { 212 pid = fork(); 213 if (pid == 0) { 214 execl(params->script, params->script, ndev->tap_name, NULL); 215 _exit(1); 216 } else { 217 waitpid(pid, &status, 0); 218 if (WIFEXITED(status) && WEXITSTATUS(status) != 0) { 219 pr_warning("Fail to setup tap by %s", params->script); 220 goto fail; 221 } 222 } 223 } else { 224 memset(&ifr, 0, sizeof(ifr)); 225 strncpy(ifr.ifr_name, ndev->tap_name, sizeof(ndev->tap_name)); 226 sin.sin_addr.s_addr = inet_addr(params->host_ip); 227 memcpy(&(ifr.ifr_addr), &sin, sizeof(ifr.ifr_addr)); 228 ifr.ifr_addr.sa_family = AF_INET; 229 if (ioctl(sock, SIOCSIFADDR, &ifr) < 0) { 230 pr_warning("Could not set ip address on tap device"); 231 goto fail; 232 } 233 } 234 235 memset(&ifr, 0, sizeof(ifr)); 236 strncpy(ifr.ifr_name, ndev->tap_name, sizeof(ndev->tap_name)); 237 ioctl(sock, SIOCGIFFLAGS, &ifr); 238 ifr.ifr_flags |= IFF_UP | IFF_RUNNING; 239 if (ioctl(sock, SIOCSIFFLAGS, &ifr) < 0) 240 pr_warning("Could not bring tap device up"); 241 242 close(sock); 243 244 return 1; 245 246 fail: 247 if (sock >= 0) 248 close(sock); 249 if (ndev->tap_fd >= 0) 250 close(ndev->tap_fd); 251 252 return 0; 253 } 254 255 static void virtio_net__io_thread_init(struct kvm *kvm, struct net_dev *ndev) 256 { 257 pthread_mutex_init(&ndev->io_tx_lock, NULL); 258 pthread_mutex_init(&ndev->io_rx_lock, NULL); 259 260 pthread_cond_init(&ndev->io_tx_cond, NULL); 261 pthread_cond_init(&ndev->io_rx_cond, NULL); 262 263 pthread_create(&ndev->io_tx_thread, NULL, virtio_net_tx_thread, ndev); 264 pthread_create(&ndev->io_rx_thread, NULL, virtio_net_rx_thread, ndev); 265 } 266 267 static inline int tap_ops_tx(struct iovec *iov, u16 out, struct net_dev *ndev) 268 { 269 return writev(ndev->tap_fd, iov, out); 270 } 271 272 static inline int tap_ops_rx(struct iovec *iov, u16 in, struct net_dev *ndev) 273 { 274 return readv(ndev->tap_fd, iov, in); 275 } 276 277 static inline int uip_ops_tx(struct iovec *iov, u16 out, struct net_dev *ndev) 278 { 279 return uip_tx(iov, out, &ndev->info); 280 } 281 282 static inline int uip_ops_rx(struct iovec *iov, u16 in, struct net_dev *ndev) 283 { 284 return uip_rx(iov, in, &ndev->info); 285 } 286 287 static struct net_dev_operations tap_ops = { 288 .rx = tap_ops_rx, 289 .tx = tap_ops_tx, 290 }; 291 292 static struct net_dev_operations uip_ops = { 293 .rx = uip_ops_rx, 294 .tx = uip_ops_tx, 295 }; 296 297 static void set_config(struct kvm *kvm, void *dev, u8 data, u32 offset) 298 { 299 struct net_dev *ndev = dev; 300 301 ((u8 *)(&ndev->config))[offset] = data; 302 } 303 304 static u8 get_config(struct kvm *kvm, void *dev, u32 offset) 305 { 306 struct net_dev *ndev = dev; 307 308 return ((u8 *)(&ndev->config))[offset]; 309 } 310 311 static u32 get_host_features(struct kvm *kvm, void *dev) 312 { 313 return 1UL << VIRTIO_NET_F_MAC 314 | 1UL << VIRTIO_NET_F_CSUM 315 | 1UL << VIRTIO_NET_F_HOST_UFO 316 | 1UL << VIRTIO_NET_F_HOST_TSO4 317 | 1UL << VIRTIO_NET_F_HOST_TSO6 318 | 1UL << VIRTIO_NET_F_GUEST_UFO 319 | 1UL << VIRTIO_NET_F_GUEST_TSO4 320 | 1UL << VIRTIO_NET_F_GUEST_TSO6 321 | 1UL << VIRTIO_RING_F_EVENT_IDX 322 | 1UL << VIRTIO_RING_F_INDIRECT_DESC; 323 } 324 325 static void set_guest_features(struct kvm *kvm, void *dev, u32 features) 326 { 327 struct net_dev *ndev = dev; 328 329 ndev->features = features; 330 } 331 332 static int init_vq(struct kvm *kvm, void *dev, u32 vq, u32 pfn) 333 { 334 struct vhost_vring_state state = { .index = vq }; 335 struct vhost_vring_addr addr; 336 struct net_dev *ndev = dev; 337 struct virt_queue *queue; 338 void *p; 339 int r; 340 341 compat__remove_message(compat_id); 342 343 queue = &ndev->vqs[vq]; 344 queue->pfn = pfn; 345 p = guest_pfn_to_host(kvm, queue->pfn); 346 347 vring_init(&queue->vring, VIRTIO_NET_QUEUE_SIZE, p, VIRTIO_PCI_VRING_ALIGN); 348 349 if (ndev->vhost_fd == 0) 350 return 0; 351 352 state.num = queue->vring.num; 353 r = ioctl(ndev->vhost_fd, VHOST_SET_VRING_NUM, &state); 354 if (r < 0) 355 die_perror("VHOST_SET_VRING_NUM failed"); 356 state.num = 0; 357 r = ioctl(ndev->vhost_fd, VHOST_SET_VRING_BASE, &state); 358 if (r < 0) 359 die_perror("VHOST_SET_VRING_BASE failed"); 360 361 addr = (struct vhost_vring_addr) { 362 .index = vq, 363 .desc_user_addr = (u64)(unsigned long)queue->vring.desc, 364 .avail_user_addr = (u64)(unsigned long)queue->vring.avail, 365 .used_user_addr = (u64)(unsigned long)queue->vring.used, 366 }; 367 368 r = ioctl(ndev->vhost_fd, VHOST_SET_VRING_ADDR, &addr); 369 if (r < 0) 370 die_perror("VHOST_SET_VRING_ADDR failed"); 371 372 return 0; 373 } 374 375 static void notify_vq_gsi(struct kvm *kvm, void *dev, u32 vq, u32 gsi) 376 { 377 struct net_dev *ndev = dev; 378 struct kvm_irqfd irq; 379 struct vhost_vring_file file; 380 int r; 381 382 if (ndev->vhost_fd == 0) 383 return; 384 385 irq = (struct kvm_irqfd) { 386 .gsi = gsi, 387 .fd = eventfd(0, 0), 388 }; 389 file = (struct vhost_vring_file) { 390 .index = vq, 391 .fd = irq.fd, 392 }; 393 394 r = ioctl(kvm->vm_fd, KVM_IRQFD, &irq); 395 if (r < 0) 396 die_perror("KVM_IRQFD failed"); 397 398 r = ioctl(ndev->vhost_fd, VHOST_SET_VRING_CALL, &file); 399 if (r < 0) 400 die_perror("VHOST_SET_VRING_CALL failed"); 401 file.fd = ndev->tap_fd; 402 r = ioctl(ndev->vhost_fd, VHOST_NET_SET_BACKEND, &file); 403 if (r != 0) 404 die("VHOST_NET_SET_BACKEND failed %d", errno); 405 406 } 407 408 static void notify_vq_eventfd(struct kvm *kvm, void *dev, u32 vq, u32 efd) 409 { 410 struct net_dev *ndev = dev; 411 struct vhost_vring_file file = { 412 .index = vq, 413 .fd = efd, 414 }; 415 int r; 416 417 if (ndev->vhost_fd == 0) 418 return; 419 420 r = ioctl(ndev->vhost_fd, VHOST_SET_VRING_KICK, &file); 421 if (r < 0) 422 die_perror("VHOST_SET_VRING_KICK failed"); 423 } 424 425 static int notify_vq(struct kvm *kvm, void *dev, u32 vq) 426 { 427 struct net_dev *ndev = dev; 428 429 virtio_net_handle_callback(kvm, ndev, vq); 430 431 return 0; 432 } 433 434 static int get_pfn_vq(struct kvm *kvm, void *dev, u32 vq) 435 { 436 struct net_dev *ndev = dev; 437 438 return ndev->vqs[vq].pfn; 439 } 440 441 static int get_size_vq(struct kvm *kvm, void *dev, u32 vq) 442 { 443 return VIRTIO_NET_QUEUE_SIZE; 444 } 445 446 static struct virtio_ops net_dev_virtio_ops = (struct virtio_ops) { 447 .set_config = set_config, 448 .get_config = get_config, 449 .get_host_features = get_host_features, 450 .set_guest_features = set_guest_features, 451 .init_vq = init_vq, 452 .notify_vq = notify_vq, 453 .get_pfn_vq = get_pfn_vq, 454 .get_size_vq = get_size_vq, 455 .notify_vq_gsi = notify_vq_gsi, 456 .notify_vq_eventfd = notify_vq_eventfd, 457 }; 458 459 static void virtio_net__vhost_init(struct kvm *kvm, struct net_dev *ndev) 460 { 461 u64 features = 1UL << VIRTIO_RING_F_EVENT_IDX; 462 struct vhost_memory *mem; 463 int r; 464 465 ndev->vhost_fd = open("/dev/vhost-net", O_RDWR); 466 if (ndev->vhost_fd < 0) 467 die_perror("Failed openning vhost-net device"); 468 469 mem = malloc(sizeof(*mem) + sizeof(struct vhost_memory_region)); 470 if (mem == NULL) 471 die("Failed allocating memory for vhost memory map"); 472 473 mem->nregions = 1; 474 mem->regions[0] = (struct vhost_memory_region) { 475 .guest_phys_addr = 0, 476 .memory_size = kvm->ram_size, 477 .userspace_addr = (unsigned long)kvm->ram_start, 478 }; 479 480 r = ioctl(ndev->vhost_fd, VHOST_SET_OWNER); 481 if (r != 0) 482 die_perror("VHOST_SET_OWNER failed"); 483 484 r = ioctl(ndev->vhost_fd, VHOST_SET_FEATURES, &features); 485 if (r != 0) 486 die_perror("VHOST_SET_FEATURES failed"); 487 r = ioctl(ndev->vhost_fd, VHOST_SET_MEM_TABLE, mem); 488 if (r != 0) 489 die_perror("VHOST_SET_MEM_TABLE failed"); 490 free(mem); 491 } 492 493 void virtio_net__init(const struct virtio_net_params *params) 494 { 495 int i; 496 struct net_dev *ndev; 497 498 if (!params) 499 return; 500 501 ndev = calloc(1, sizeof(struct net_dev)); 502 if (ndev == NULL) 503 die("Failed allocating ndev"); 504 505 list_add_tail(&ndev->list, &ndevs); 506 507 ndev->kvm = params->kvm; 508 509 mutex_init(&ndev->mutex); 510 ndev->config.status = VIRTIO_NET_S_LINK_UP; 511 512 for (i = 0 ; i < 6 ; i++) { 513 ndev->config.mac[i] = params->guest_mac[i]; 514 ndev->info.guest_mac.addr[i] = params->guest_mac[i]; 515 ndev->info.host_mac.addr[i] = params->host_mac[i]; 516 } 517 518 ndev->mode = params->mode; 519 if (ndev->mode == NET_MODE_TAP) { 520 if (!virtio_net__tap_init(params, ndev)) 521 die_perror("You have requested a TAP device, but creation of one has" 522 "failed because:"); 523 ndev->ops = &tap_ops; 524 } else { 525 ndev->info.host_ip = ntohl(inet_addr(params->host_ip)); 526 ndev->info.guest_ip = ntohl(inet_addr(params->guest_ip)); 527 ndev->info.guest_netmask = ntohl(inet_addr("255.255.255.0")); 528 ndev->info.buf_nr = 20, 529 uip_init(&ndev->info); 530 ndev->ops = &uip_ops; 531 } 532 533 virtio_trans_init(&ndev->vtrans, VIRTIO_PCI); 534 ndev->vtrans.trans_ops->init(kvm, &ndev->vtrans, ndev, PCI_DEVICE_ID_VIRTIO_NET, 535 VIRTIO_ID_NET, PCI_CLASS_NET); 536 ndev->vtrans.virtio_ops = &net_dev_virtio_ops; 537 538 if (params->vhost) 539 virtio_net__vhost_init(params->kvm, ndev); 540 else 541 virtio_net__io_thread_init(params->kvm, ndev); 542 543 if (compat_id != -1) 544 compat_id = compat__add_message("virtio-net device was not detected", 545 "While you have requested a virtio-net device, " 546 "the guest kernel did not initialize it.\n" 547 "Please make sure that the guest kernel was " 548 "compiled with CONFIG_VIRTIO_NET=y enabled " 549 "in its .config"); 550 } 551