1 /* SPDX-License-Identifier: BSD-3-Clause 2 * Copyright(c) 2010-2018 Intel Corporation 3 */ 4 5 #ifndef _VHOST_NET_CDEV_H_ 6 #define _VHOST_NET_CDEV_H_ 7 #include <stdint.h> 8 #include <stdio.h> 9 #include <stdbool.h> 10 #include <sys/types.h> 11 #include <sys/queue.h> 12 #include <unistd.h> 13 #include <linux/vhost.h> 14 #include <linux/virtio_net.h> 15 #include <sys/socket.h> 16 #include <linux/if.h> 17 18 #include <rte_log.h> 19 #include <rte_ether.h> 20 #include <rte_rwlock.h> 21 #include <rte_malloc.h> 22 23 #include "rte_vhost.h" 24 #include "rte_vdpa.h" 25 #include "vdpa_driver.h" 26 27 #include "rte_vhost_async.h" 28 29 /* Used to indicate that the device is running on a data core */ 30 #define VIRTIO_DEV_RUNNING ((uint32_t)1 << 0) 31 /* Used to indicate that the device is ready to operate */ 32 #define VIRTIO_DEV_READY ((uint32_t)1 << 1) 33 /* Used to indicate that the built-in vhost net device backend is enabled */ 34 #define VIRTIO_DEV_BUILTIN_VIRTIO_NET ((uint32_t)1 << 2) 35 /* Used to indicate that the device has its own data path and configured */ 36 #define VIRTIO_DEV_VDPA_CONFIGURED ((uint32_t)1 << 3) 37 /* Used to indicate that the feature negotiation failed */ 38 #define VIRTIO_DEV_FEATURES_FAILED ((uint32_t)1 << 4) 39 /* Used to indicate that the virtio_net tx code should fill TX ol_flags */ 40 #define VIRTIO_DEV_LEGACY_OL_FLAGS ((uint32_t)1 << 5) 41 42 /* Backend value set by guest. */ 43 #define VIRTIO_DEV_STOPPED -1 44 45 #define BUF_VECTOR_MAX 256 46 47 #define VHOST_LOG_CACHE_NR 32 48 49 #define MAX_PKT_BURST 32 50 51 #define VHOST_MAX_ASYNC_IT (MAX_PKT_BURST) 52 #define VHOST_MAX_ASYNC_VEC 2048 53 54 #define PACKED_DESC_ENQUEUE_USED_FLAG(w) \ 55 ((w) ? (VRING_DESC_F_AVAIL | VRING_DESC_F_USED | VRING_DESC_F_WRITE) : \ 56 VRING_DESC_F_WRITE) 57 #define PACKED_DESC_DEQUEUE_USED_FLAG(w) \ 58 ((w) ? (VRING_DESC_F_AVAIL | VRING_DESC_F_USED) : 0x0) 59 #define PACKED_DESC_SINGLE_DEQUEUE_FLAG (VRING_DESC_F_NEXT | \ 60 VRING_DESC_F_INDIRECT) 61 62 #define PACKED_BATCH_SIZE (RTE_CACHE_LINE_SIZE / \ 63 sizeof(struct vring_packed_desc)) 64 #define PACKED_BATCH_MASK (PACKED_BATCH_SIZE - 1) 65 66 #ifdef VHOST_GCC_UNROLL_PRAGMA 67 #define vhost_for_each_try_unroll(iter, val, size) _Pragma("GCC unroll 4") \ 68 for (iter = val; iter < size; iter++) 69 #endif 70 71 #ifdef VHOST_CLANG_UNROLL_PRAGMA 72 #define vhost_for_each_try_unroll(iter, val, size) _Pragma("unroll 4") \ 73 for (iter = val; iter < size; iter++) 74 #endif 75 76 #ifdef VHOST_ICC_UNROLL_PRAGMA 77 #define vhost_for_each_try_unroll(iter, val, size) _Pragma("unroll (4)") \ 78 for (iter = val; iter < size; iter++) 79 #endif 80 81 #ifndef vhost_for_each_try_unroll 82 #define vhost_for_each_try_unroll(iter, val, num) \ 83 for (iter = val; iter < num; iter++) 84 #endif 85 86 /** 87 * Structure contains buffer address, length and descriptor index 88 * from vring to do scatter RX. 89 */ 90 struct buf_vector { 91 uint64_t buf_iova; 92 uint64_t buf_addr; 93 uint32_t buf_len; 94 uint32_t desc_idx; 95 }; 96 97 /* 98 * Structure contains the info for each batched memory copy. 99 */ 100 struct batch_copy_elem { 101 void *dst; 102 void *src; 103 uint32_t len; 104 uint64_t log_addr; 105 }; 106 107 /* 108 * Structure that contains the info for batched dirty logging. 109 */ 110 struct log_cache_entry { 111 uint32_t offset; 112 unsigned long val; 113 }; 114 115 struct vring_used_elem_packed { 116 uint16_t id; 117 uint16_t flags; 118 uint32_t len; 119 uint32_t count; 120 }; 121 122 /** 123 * inflight async packet information 124 */ 125 struct async_inflight_info { 126 struct rte_mbuf *mbuf; 127 uint16_t descs; /* num of descs inflight */ 128 uint16_t nr_buffers; /* num of buffers inflight for packed ring */ 129 }; 130 131 struct vhost_async { 132 /* operation callbacks for DMA */ 133 struct rte_vhost_async_channel_ops ops; 134 135 struct rte_vhost_iov_iter iov_iter[VHOST_MAX_ASYNC_IT]; 136 struct rte_vhost_iovec iovec[VHOST_MAX_ASYNC_VEC]; 137 uint16_t iter_idx; 138 uint16_t iovec_idx; 139 140 /* data transfer status */ 141 struct async_inflight_info *pkts_info; 142 uint16_t pkts_idx; 143 uint16_t pkts_inflight_n; 144 union { 145 struct vring_used_elem *descs_split; 146 struct vring_used_elem_packed *buffers_packed; 147 }; 148 union { 149 uint16_t desc_idx_split; 150 uint16_t buffer_idx_packed; 151 }; 152 union { 153 uint16_t last_desc_idx_split; 154 uint16_t last_buffer_idx_packed; 155 }; 156 }; 157 158 /** 159 * Structure contains variables relevant to RX/TX virtqueues. 160 */ 161 struct vhost_virtqueue { 162 union { 163 struct vring_desc *desc; 164 struct vring_packed_desc *desc_packed; 165 }; 166 union { 167 struct vring_avail *avail; 168 struct vring_packed_desc_event *driver_event; 169 }; 170 union { 171 struct vring_used *used; 172 struct vring_packed_desc_event *device_event; 173 }; 174 uint16_t size; 175 176 uint16_t last_avail_idx; 177 uint16_t last_used_idx; 178 /* Last used index we notify to front end. */ 179 uint16_t signalled_used; 180 bool signalled_used_valid; 181 #define VIRTIO_INVALID_EVENTFD (-1) 182 #define VIRTIO_UNINITIALIZED_EVENTFD (-2) 183 184 bool enabled; 185 bool access_ok; 186 bool ready; 187 188 rte_spinlock_t access_lock; 189 190 191 union { 192 struct vring_used_elem *shadow_used_split; 193 struct vring_used_elem_packed *shadow_used_packed; 194 }; 195 uint16_t shadow_used_idx; 196 /* Record packed ring enqueue latest desc cache aligned index */ 197 uint16_t shadow_aligned_idx; 198 /* Record packed ring first dequeue desc index */ 199 uint16_t shadow_last_used_idx; 200 201 uint16_t batch_copy_nb_elems; 202 struct batch_copy_elem *batch_copy_elems; 203 int numa_node; 204 bool used_wrap_counter; 205 bool avail_wrap_counter; 206 207 /* Physical address of used ring, for logging */ 208 uint16_t log_cache_nb_elem; 209 uint64_t log_guest_addr; 210 struct log_cache_entry *log_cache; 211 212 rte_rwlock_t iotlb_lock; 213 rte_rwlock_t iotlb_pending_lock; 214 struct rte_mempool *iotlb_pool; 215 TAILQ_HEAD(, vhost_iotlb_entry) iotlb_list; 216 TAILQ_HEAD(, vhost_iotlb_entry) iotlb_pending_list; 217 int iotlb_cache_nr; 218 219 /* Used to notify the guest (trigger interrupt) */ 220 int callfd; 221 /* Currently unused as polling mode is enabled */ 222 int kickfd; 223 224 /* inflight share memory info */ 225 union { 226 struct rte_vhost_inflight_info_split *inflight_split; 227 struct rte_vhost_inflight_info_packed *inflight_packed; 228 }; 229 struct rte_vhost_resubmit_info *resubmit_inflight; 230 uint64_t global_counter; 231 232 struct vhost_async *async; 233 234 int notif_enable; 235 #define VIRTIO_UNINITIALIZED_NOTIF (-1) 236 237 struct vhost_vring_addr ring_addrs; 238 } __rte_cache_aligned; 239 240 /* Virtio device status as per Virtio specification */ 241 #define VIRTIO_DEVICE_STATUS_RESET 0x00 242 #define VIRTIO_DEVICE_STATUS_ACK 0x01 243 #define VIRTIO_DEVICE_STATUS_DRIVER 0x02 244 #define VIRTIO_DEVICE_STATUS_DRIVER_OK 0x04 245 #define VIRTIO_DEVICE_STATUS_FEATURES_OK 0x08 246 #define VIRTIO_DEVICE_STATUS_DEV_NEED_RESET 0x40 247 #define VIRTIO_DEVICE_STATUS_FAILED 0x80 248 249 #define VHOST_MAX_VRING 0x100 250 #define VHOST_MAX_QUEUE_PAIRS 0x80 251 252 /* Declare IOMMU related bits for older kernels */ 253 #ifndef VIRTIO_F_IOMMU_PLATFORM 254 255 #define VIRTIO_F_IOMMU_PLATFORM 33 256 257 struct vhost_iotlb_msg { 258 __u64 iova; 259 __u64 size; 260 __u64 uaddr; 261 #define VHOST_ACCESS_RO 0x1 262 #define VHOST_ACCESS_WO 0x2 263 #define VHOST_ACCESS_RW 0x3 264 __u8 perm; 265 #define VHOST_IOTLB_MISS 1 266 #define VHOST_IOTLB_UPDATE 2 267 #define VHOST_IOTLB_INVALIDATE 3 268 #define VHOST_IOTLB_ACCESS_FAIL 4 269 __u8 type; 270 }; 271 272 #define VHOST_IOTLB_MSG 0x1 273 274 struct vhost_msg { 275 int type; 276 union { 277 struct vhost_iotlb_msg iotlb; 278 __u8 padding[64]; 279 }; 280 }; 281 #endif 282 283 /* 284 * Define virtio 1.0 for older kernels 285 */ 286 #ifndef VIRTIO_F_VERSION_1 287 #define VIRTIO_F_VERSION_1 32 288 #endif 289 290 /* Declare packed ring related bits for older kernels */ 291 #ifndef VIRTIO_F_RING_PACKED 292 293 #define VIRTIO_F_RING_PACKED 34 294 295 struct vring_packed_desc { 296 uint64_t addr; 297 uint32_t len; 298 uint16_t id; 299 uint16_t flags; 300 }; 301 302 struct vring_packed_desc_event { 303 uint16_t off_wrap; 304 uint16_t flags; 305 }; 306 #endif 307 308 /* 309 * Declare below packed ring defines unconditionally 310 * as Kernel header might use different names. 311 */ 312 #define VRING_DESC_F_AVAIL (1ULL << 7) 313 #define VRING_DESC_F_USED (1ULL << 15) 314 315 #define VRING_EVENT_F_ENABLE 0x0 316 #define VRING_EVENT_F_DISABLE 0x1 317 #define VRING_EVENT_F_DESC 0x2 318 319 /* 320 * Available and used descs are in same order 321 */ 322 #ifndef VIRTIO_F_IN_ORDER 323 #define VIRTIO_F_IN_ORDER 35 324 #endif 325 326 /* Features supported by this builtin vhost-user net driver. */ 327 #define VIRTIO_NET_SUPPORTED_FEATURES ((1ULL << VIRTIO_NET_F_MRG_RXBUF) | \ 328 (1ULL << VIRTIO_F_ANY_LAYOUT) | \ 329 (1ULL << VIRTIO_NET_F_CTRL_VQ) | \ 330 (1ULL << VIRTIO_NET_F_CTRL_RX) | \ 331 (1ULL << VIRTIO_NET_F_GUEST_ANNOUNCE) | \ 332 (1ULL << VIRTIO_NET_F_MQ) | \ 333 (1ULL << VIRTIO_F_VERSION_1) | \ 334 (1ULL << VHOST_F_LOG_ALL) | \ 335 (1ULL << VHOST_USER_F_PROTOCOL_FEATURES) | \ 336 (1ULL << VIRTIO_NET_F_GSO) | \ 337 (1ULL << VIRTIO_NET_F_HOST_TSO4) | \ 338 (1ULL << VIRTIO_NET_F_HOST_TSO6) | \ 339 (1ULL << VIRTIO_NET_F_HOST_UFO) | \ 340 (1ULL << VIRTIO_NET_F_HOST_ECN) | \ 341 (1ULL << VIRTIO_NET_F_CSUM) | \ 342 (1ULL << VIRTIO_NET_F_GUEST_CSUM) | \ 343 (1ULL << VIRTIO_NET_F_GUEST_TSO4) | \ 344 (1ULL << VIRTIO_NET_F_GUEST_TSO6) | \ 345 (1ULL << VIRTIO_NET_F_GUEST_UFO) | \ 346 (1ULL << VIRTIO_NET_F_GUEST_ECN) | \ 347 (1ULL << VIRTIO_RING_F_INDIRECT_DESC) | \ 348 (1ULL << VIRTIO_RING_F_EVENT_IDX) | \ 349 (1ULL << VIRTIO_NET_F_MTU) | \ 350 (1ULL << VIRTIO_F_IN_ORDER) | \ 351 (1ULL << VIRTIO_F_IOMMU_PLATFORM) | \ 352 (1ULL << VIRTIO_F_RING_PACKED)) 353 354 355 struct guest_page { 356 uint64_t guest_phys_addr; 357 uint64_t host_phys_addr; 358 uint64_t size; 359 }; 360 361 struct inflight_mem_info { 362 int fd; 363 void *addr; 364 uint64_t size; 365 }; 366 367 /** 368 * Device structure contains all configuration information relating 369 * to the device. 370 */ 371 struct virtio_net { 372 /* Frontend (QEMU) memory and memory region information */ 373 struct rte_vhost_memory *mem; 374 uint64_t features; 375 uint64_t protocol_features; 376 int vid; 377 uint32_t flags; 378 uint16_t vhost_hlen; 379 /* to tell if we need broadcast rarp packet */ 380 int16_t broadcast_rarp; 381 uint32_t nr_vring; 382 int async_copy; 383 384 int extbuf; 385 int linearbuf; 386 struct vhost_virtqueue *virtqueue[VHOST_MAX_QUEUE_PAIRS * 2]; 387 struct inflight_mem_info *inflight_info; 388 #define IF_NAME_SZ (PATH_MAX > IFNAMSIZ ? PATH_MAX : IFNAMSIZ) 389 char ifname[IF_NAME_SZ]; 390 uint64_t log_size; 391 uint64_t log_base; 392 uint64_t log_addr; 393 struct rte_ether_addr mac; 394 uint16_t mtu; 395 uint8_t status; 396 397 struct rte_vhost_device_ops const *notify_ops; 398 399 uint32_t nr_guest_pages; 400 uint32_t max_guest_pages; 401 struct guest_page *guest_pages; 402 403 int slave_req_fd; 404 rte_spinlock_t slave_req_lock; 405 406 int postcopy_ufd; 407 int postcopy_listening; 408 409 struct rte_vdpa_device *vdpa_dev; 410 411 /* context data for the external message handlers */ 412 void *extern_data; 413 /* pre and post vhost user message handlers for the device */ 414 struct rte_vhost_user_extern_ops extern_ops; 415 } __rte_cache_aligned; 416 417 static __rte_always_inline bool 418 vq_is_packed(struct virtio_net *dev) 419 { 420 return dev->features & (1ull << VIRTIO_F_RING_PACKED); 421 } 422 423 static inline bool 424 desc_is_avail(struct vring_packed_desc *desc, bool wrap_counter) 425 { 426 uint16_t flags = __atomic_load_n(&desc->flags, __ATOMIC_ACQUIRE); 427 428 return wrap_counter == !!(flags & VRING_DESC_F_AVAIL) && 429 wrap_counter != !!(flags & VRING_DESC_F_USED); 430 } 431 432 static inline void 433 vq_inc_last_used_packed(struct vhost_virtqueue *vq, uint16_t num) 434 { 435 vq->last_used_idx += num; 436 if (vq->last_used_idx >= vq->size) { 437 vq->used_wrap_counter ^= 1; 438 vq->last_used_idx -= vq->size; 439 } 440 } 441 442 static inline void 443 vq_inc_last_avail_packed(struct vhost_virtqueue *vq, uint16_t num) 444 { 445 vq->last_avail_idx += num; 446 if (vq->last_avail_idx >= vq->size) { 447 vq->avail_wrap_counter ^= 1; 448 vq->last_avail_idx -= vq->size; 449 } 450 } 451 452 void __vhost_log_cache_write(struct virtio_net *dev, 453 struct vhost_virtqueue *vq, 454 uint64_t addr, uint64_t len); 455 void __vhost_log_cache_write_iova(struct virtio_net *dev, 456 struct vhost_virtqueue *vq, 457 uint64_t iova, uint64_t len); 458 void __vhost_log_cache_sync(struct virtio_net *dev, 459 struct vhost_virtqueue *vq); 460 void __vhost_log_write(struct virtio_net *dev, uint64_t addr, uint64_t len); 461 void __vhost_log_write_iova(struct virtio_net *dev, struct vhost_virtqueue *vq, 462 uint64_t iova, uint64_t len); 463 464 static __rte_always_inline void 465 vhost_log_write(struct virtio_net *dev, uint64_t addr, uint64_t len) 466 { 467 if (unlikely(dev->features & (1ULL << VHOST_F_LOG_ALL))) 468 __vhost_log_write(dev, addr, len); 469 } 470 471 static __rte_always_inline void 472 vhost_log_cache_sync(struct virtio_net *dev, struct vhost_virtqueue *vq) 473 { 474 if (unlikely(dev->features & (1ULL << VHOST_F_LOG_ALL))) 475 __vhost_log_cache_sync(dev, vq); 476 } 477 478 static __rte_always_inline void 479 vhost_log_cache_write(struct virtio_net *dev, struct vhost_virtqueue *vq, 480 uint64_t addr, uint64_t len) 481 { 482 if (unlikely(dev->features & (1ULL << VHOST_F_LOG_ALL))) 483 __vhost_log_cache_write(dev, vq, addr, len); 484 } 485 486 static __rte_always_inline void 487 vhost_log_cache_used_vring(struct virtio_net *dev, struct vhost_virtqueue *vq, 488 uint64_t offset, uint64_t len) 489 { 490 if (unlikely(dev->features & (1ULL << VHOST_F_LOG_ALL))) { 491 if (unlikely(vq->log_guest_addr == 0)) 492 return; 493 __vhost_log_cache_write(dev, vq, vq->log_guest_addr + offset, 494 len); 495 } 496 } 497 498 static __rte_always_inline void 499 vhost_log_used_vring(struct virtio_net *dev, struct vhost_virtqueue *vq, 500 uint64_t offset, uint64_t len) 501 { 502 if (unlikely(dev->features & (1ULL << VHOST_F_LOG_ALL))) { 503 if (unlikely(vq->log_guest_addr == 0)) 504 return; 505 __vhost_log_write(dev, vq->log_guest_addr + offset, len); 506 } 507 } 508 509 static __rte_always_inline void 510 vhost_log_cache_write_iova(struct virtio_net *dev, struct vhost_virtqueue *vq, 511 uint64_t iova, uint64_t len) 512 { 513 if (likely(!(dev->features & (1ULL << VHOST_F_LOG_ALL)))) 514 return; 515 516 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)) 517 __vhost_log_cache_write_iova(dev, vq, iova, len); 518 else 519 __vhost_log_cache_write(dev, vq, iova, len); 520 } 521 522 static __rte_always_inline void 523 vhost_log_write_iova(struct virtio_net *dev, struct vhost_virtqueue *vq, 524 uint64_t iova, uint64_t len) 525 { 526 if (likely(!(dev->features & (1ULL << VHOST_F_LOG_ALL)))) 527 return; 528 529 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)) 530 __vhost_log_write_iova(dev, vq, iova, len); 531 else 532 __vhost_log_write(dev, iova, len); 533 } 534 535 extern int vhost_config_log_level; 536 extern int vhost_data_log_level; 537 538 #define VHOST_LOG_CONFIG(level, fmt, args...) \ 539 rte_log(RTE_LOG_ ## level, vhost_config_log_level, \ 540 "VHOST_CONFIG: " fmt, ##args) 541 542 #define VHOST_LOG_DATA(level, fmt, args...) \ 543 (void)((RTE_LOG_ ## level <= RTE_LOG_DP_LEVEL) ? \ 544 rte_log(RTE_LOG_ ## level, vhost_data_log_level, \ 545 "VHOST_DATA : " fmt, ##args) : \ 546 0) 547 548 #ifdef RTE_LIBRTE_VHOST_DEBUG 549 #define VHOST_MAX_PRINT_BUFF 6072 550 #define PRINT_PACKET(device, addr, size, header) do { \ 551 char *pkt_addr = (char *)(addr); \ 552 unsigned int index; \ 553 char packet[VHOST_MAX_PRINT_BUFF]; \ 554 \ 555 if ((header)) \ 556 snprintf(packet, VHOST_MAX_PRINT_BUFF, "(%d) Header size %d: ", (device->vid), (size)); \ 557 else \ 558 snprintf(packet, VHOST_MAX_PRINT_BUFF, "(%d) Packet size %d: ", (device->vid), (size)); \ 559 for (index = 0; index < (size); index++) { \ 560 snprintf(packet + strnlen(packet, VHOST_MAX_PRINT_BUFF), VHOST_MAX_PRINT_BUFF - strnlen(packet, VHOST_MAX_PRINT_BUFF), \ 561 "%02hhx ", pkt_addr[index]); \ 562 } \ 563 snprintf(packet + strnlen(packet, VHOST_MAX_PRINT_BUFF), VHOST_MAX_PRINT_BUFF - strnlen(packet, VHOST_MAX_PRINT_BUFF), "\n"); \ 564 \ 565 VHOST_LOG_DATA(DEBUG, "%s", packet); \ 566 } while (0) 567 #else 568 #define PRINT_PACKET(device, addr, size, header) do {} while (0) 569 #endif 570 571 #define MAX_VHOST_DEVICE 1024 572 extern struct virtio_net *vhost_devices[MAX_VHOST_DEVICE]; 573 574 #define VHOST_BINARY_SEARCH_THRESH 256 575 576 static __rte_always_inline int guest_page_addrcmp(const void *p1, 577 const void *p2) 578 { 579 const struct guest_page *page1 = (const struct guest_page *)p1; 580 const struct guest_page *page2 = (const struct guest_page *)p2; 581 582 if (page1->guest_phys_addr > page2->guest_phys_addr) 583 return 1; 584 if (page1->guest_phys_addr < page2->guest_phys_addr) 585 return -1; 586 587 return 0; 588 } 589 590 static __rte_always_inline rte_iova_t 591 gpa_to_first_hpa(struct virtio_net *dev, uint64_t gpa, 592 uint64_t gpa_size, uint64_t *hpa_size) 593 { 594 uint32_t i; 595 struct guest_page *page; 596 struct guest_page key; 597 598 *hpa_size = gpa_size; 599 if (dev->nr_guest_pages >= VHOST_BINARY_SEARCH_THRESH) { 600 key.guest_phys_addr = gpa & ~(dev->guest_pages[0].size - 1); 601 page = bsearch(&key, dev->guest_pages, dev->nr_guest_pages, 602 sizeof(struct guest_page), guest_page_addrcmp); 603 if (page) { 604 if (gpa + gpa_size <= 605 page->guest_phys_addr + page->size) { 606 return gpa - page->guest_phys_addr + 607 page->host_phys_addr; 608 } else if (gpa < page->guest_phys_addr + 609 page->size) { 610 *hpa_size = page->guest_phys_addr + 611 page->size - gpa; 612 return gpa - page->guest_phys_addr + 613 page->host_phys_addr; 614 } 615 } 616 } else { 617 for (i = 0; i < dev->nr_guest_pages; i++) { 618 page = &dev->guest_pages[i]; 619 620 if (gpa >= page->guest_phys_addr) { 621 if (gpa + gpa_size <= 622 page->guest_phys_addr + page->size) { 623 return gpa - page->guest_phys_addr + 624 page->host_phys_addr; 625 } else if (gpa < page->guest_phys_addr + 626 page->size) { 627 *hpa_size = page->guest_phys_addr + 628 page->size - gpa; 629 return gpa - page->guest_phys_addr + 630 page->host_phys_addr; 631 } 632 } 633 } 634 } 635 636 *hpa_size = 0; 637 return 0; 638 } 639 640 /* Convert guest physical address to host physical address */ 641 static __rte_always_inline rte_iova_t 642 gpa_to_hpa(struct virtio_net *dev, uint64_t gpa, uint64_t size) 643 { 644 rte_iova_t hpa; 645 uint64_t hpa_size; 646 647 hpa = gpa_to_first_hpa(dev, gpa, size, &hpa_size); 648 return hpa_size == size ? hpa : 0; 649 } 650 651 static __rte_always_inline uint64_t 652 hva_to_gpa(struct virtio_net *dev, uint64_t vva, uint64_t len) 653 { 654 struct rte_vhost_mem_region *r; 655 uint32_t i; 656 657 if (unlikely(!dev || !dev->mem)) 658 return 0; 659 660 for (i = 0; i < dev->mem->nregions; i++) { 661 r = &dev->mem->regions[i]; 662 663 if (vva >= r->host_user_addr && 664 vva + len < r->host_user_addr + r->size) { 665 return r->guest_phys_addr + vva - r->host_user_addr; 666 } 667 } 668 return 0; 669 } 670 671 static __rte_always_inline struct virtio_net * 672 get_device(int vid) 673 { 674 struct virtio_net *dev = vhost_devices[vid]; 675 676 if (unlikely(!dev)) { 677 VHOST_LOG_CONFIG(ERR, 678 "(%d) device not found.\n", vid); 679 } 680 681 return dev; 682 } 683 684 int vhost_new_device(void); 685 void cleanup_device(struct virtio_net *dev, int destroy); 686 void reset_device(struct virtio_net *dev); 687 void vhost_destroy_device(int); 688 void vhost_destroy_device_notify(struct virtio_net *dev); 689 690 void cleanup_vq(struct vhost_virtqueue *vq, int destroy); 691 void cleanup_vq_inflight(struct virtio_net *dev, struct vhost_virtqueue *vq); 692 void free_vq(struct virtio_net *dev, struct vhost_virtqueue *vq); 693 694 int alloc_vring_queue(struct virtio_net *dev, uint32_t vring_idx); 695 696 void vhost_attach_vdpa_device(int vid, struct rte_vdpa_device *dev); 697 698 void vhost_set_ifname(int, const char *if_name, unsigned int if_len); 699 void vhost_setup_virtio_net(int vid, bool enable, bool legacy_ol_flags); 700 void vhost_enable_extbuf(int vid); 701 void vhost_enable_linearbuf(int vid); 702 int vhost_enable_guest_notification(struct virtio_net *dev, 703 struct vhost_virtqueue *vq, int enable); 704 705 struct rte_vhost_device_ops const *vhost_driver_callback_get(const char *path); 706 707 /* 708 * Backend-specific cleanup. 709 * 710 * TODO: fix it; we have one backend now 711 */ 712 void vhost_backend_cleanup(struct virtio_net *dev); 713 714 uint64_t __vhost_iova_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq, 715 uint64_t iova, uint64_t *len, uint8_t perm); 716 void *vhost_alloc_copy_ind_table(struct virtio_net *dev, 717 struct vhost_virtqueue *vq, 718 uint64_t desc_addr, uint64_t desc_len); 719 int vring_translate(struct virtio_net *dev, struct vhost_virtqueue *vq); 720 uint64_t translate_log_addr(struct virtio_net *dev, struct vhost_virtqueue *vq, 721 uint64_t log_addr); 722 void vring_invalidate(struct virtio_net *dev, struct vhost_virtqueue *vq); 723 724 static __rte_always_inline uint64_t 725 vhost_iova_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq, 726 uint64_t iova, uint64_t *len, uint8_t perm) 727 { 728 if (!(dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))) 729 return rte_vhost_va_from_guest_pa(dev->mem, iova, len); 730 731 return __vhost_iova_to_vva(dev, vq, iova, len, perm); 732 } 733 734 #define vhost_avail_event(vr) \ 735 (*(volatile uint16_t*)&(vr)->used->ring[(vr)->size]) 736 #define vhost_used_event(vr) \ 737 (*(volatile uint16_t*)&(vr)->avail->ring[(vr)->size]) 738 739 /* 740 * The following is used with VIRTIO_RING_F_EVENT_IDX. 741 * Assuming a given event_idx value from the other size, if we have 742 * just incremented index from old to new_idx, should we trigger an 743 * event? 744 */ 745 static __rte_always_inline int 746 vhost_need_event(uint16_t event_idx, uint16_t new_idx, uint16_t old) 747 { 748 return (uint16_t)(new_idx - event_idx - 1) < (uint16_t)(new_idx - old); 749 } 750 751 static __rte_always_inline void 752 vhost_vring_call_split(struct virtio_net *dev, struct vhost_virtqueue *vq) 753 { 754 /* Flush used->idx update before we read avail->flags. */ 755 rte_atomic_thread_fence(__ATOMIC_SEQ_CST); 756 757 /* Don't kick guest if we don't reach index specified by guest. */ 758 if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX)) { 759 uint16_t old = vq->signalled_used; 760 uint16_t new = vq->last_used_idx; 761 bool signalled_used_valid = vq->signalled_used_valid; 762 763 vq->signalled_used = new; 764 vq->signalled_used_valid = true; 765 766 VHOST_LOG_DATA(DEBUG, "%s: used_event_idx=%d, old=%d, new=%d\n", 767 __func__, 768 vhost_used_event(vq), 769 old, new); 770 771 if ((vhost_need_event(vhost_used_event(vq), new, old) && 772 (vq->callfd >= 0)) || 773 unlikely(!signalled_used_valid)) { 774 eventfd_write(vq->callfd, (eventfd_t) 1); 775 if (dev->notify_ops->guest_notified) 776 dev->notify_ops->guest_notified(dev->vid); 777 } 778 } else { 779 /* Kick the guest if necessary. */ 780 if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT) 781 && (vq->callfd >= 0)) { 782 eventfd_write(vq->callfd, (eventfd_t)1); 783 if (dev->notify_ops->guest_notified) 784 dev->notify_ops->guest_notified(dev->vid); 785 } 786 } 787 } 788 789 static __rte_always_inline void 790 vhost_vring_call_packed(struct virtio_net *dev, struct vhost_virtqueue *vq) 791 { 792 uint16_t old, new, off, off_wrap; 793 bool signalled_used_valid, kick = false; 794 795 /* Flush used desc update. */ 796 rte_atomic_thread_fence(__ATOMIC_SEQ_CST); 797 798 if (!(dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))) { 799 if (vq->driver_event->flags != 800 VRING_EVENT_F_DISABLE) 801 kick = true; 802 goto kick; 803 } 804 805 old = vq->signalled_used; 806 new = vq->last_used_idx; 807 vq->signalled_used = new; 808 signalled_used_valid = vq->signalled_used_valid; 809 vq->signalled_used_valid = true; 810 811 if (vq->driver_event->flags != VRING_EVENT_F_DESC) { 812 if (vq->driver_event->flags != VRING_EVENT_F_DISABLE) 813 kick = true; 814 goto kick; 815 } 816 817 if (unlikely(!signalled_used_valid)) { 818 kick = true; 819 goto kick; 820 } 821 822 rte_atomic_thread_fence(__ATOMIC_ACQUIRE); 823 824 off_wrap = vq->driver_event->off_wrap; 825 off = off_wrap & ~(1 << 15); 826 827 if (new <= old) 828 old -= vq->size; 829 830 if (vq->used_wrap_counter != off_wrap >> 15) 831 off -= vq->size; 832 833 if (vhost_need_event(off, new, old)) 834 kick = true; 835 kick: 836 if (kick) { 837 eventfd_write(vq->callfd, (eventfd_t)1); 838 if (dev->notify_ops->guest_notified) 839 dev->notify_ops->guest_notified(dev->vid); 840 } 841 } 842 843 static __rte_always_inline void 844 free_ind_table(void *idesc) 845 { 846 rte_free(idesc); 847 } 848 849 static __rte_always_inline void 850 restore_mbuf(struct rte_mbuf *m) 851 { 852 uint32_t mbuf_size, priv_size; 853 854 while (m) { 855 priv_size = rte_pktmbuf_priv_size(m->pool); 856 mbuf_size = sizeof(struct rte_mbuf) + priv_size; 857 /* start of buffer is after mbuf structure and priv data */ 858 859 m->buf_addr = (char *)m + mbuf_size; 860 m->buf_iova = rte_mempool_virt2iova(m) + mbuf_size; 861 m = m->next; 862 } 863 } 864 865 static __rte_always_inline bool 866 mbuf_is_consumed(struct rte_mbuf *m) 867 { 868 while (m) { 869 if (rte_mbuf_refcnt_read(m) > 1) 870 return false; 871 m = m->next; 872 } 873 874 return true; 875 } 876 877 #endif /* _VHOST_NET_CDEV_H_ */ 878