1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2018 Intel Corporation
5 #ifndef _VHOST_NET_CDEV_H_
6 #define _VHOST_NET_CDEV_H_
10 #include <sys/types.h>
11 #include <sys/queue.h>
13 #include <linux/vhost.h>
14 #include <linux/virtio_net.h>
15 #include <sys/socket.h>
19 #include <rte_ether.h>
20 #include <rte_rwlock.h>
21 #include <rte_malloc.h>
23 #include "rte_vhost.h"
25 #include "vdpa_driver.h"
27 #include "rte_vhost_async.h"
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)
42 /* Backend value set by guest. */
43 #define VIRTIO_DEV_STOPPED -1
45 #define BUF_VECTOR_MAX 256
47 #define VHOST_LOG_CACHE_NR 32
49 #define MAX_PKT_BURST 32
51 #define VHOST_MAX_ASYNC_IT (MAX_PKT_BURST)
52 #define VHOST_MAX_ASYNC_VEC 2048
54 #define PACKED_DESC_ENQUEUE_USED_FLAG(w) \
55 ((w) ? (VRING_DESC_F_AVAIL | VRING_DESC_F_USED | 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)
62 #define PACKED_BATCH_SIZE (RTE_CACHE_LINE_SIZE / \
63 sizeof(struct vring_packed_desc))
64 #define PACKED_BATCH_MASK (PACKED_BATCH_SIZE - 1)
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++)
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++)
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++)
81 #ifndef vhost_for_each_try_unroll
82 #define vhost_for_each_try_unroll(iter, val, num) \
83 for (iter = val; iter < num; iter++)
87 * Structure contains buffer address, length and descriptor index
88 * from vring to do scatter RX.
98 * Structure contains the info for each batched memory copy.
100 struct batch_copy_elem {
108 * Structure that contains the info for batched dirty logging.
110 struct log_cache_entry {
115 struct vring_used_elem_packed {
123 * inflight async packet information
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 */
132 /* operation callbacks for DMA */
133 struct rte_vhost_async_channel_ops ops;
135 struct rte_vhost_iov_iter iov_iter[VHOST_MAX_ASYNC_IT];
136 struct rte_vhost_iovec iovec[VHOST_MAX_ASYNC_VEC];
140 /* data transfer status */
141 struct async_inflight_info *pkts_info;
143 uint16_t pkts_inflight_n;
145 struct vring_used_elem *descs_split;
146 struct vring_used_elem_packed *buffers_packed;
149 uint16_t desc_idx_split;
150 uint16_t buffer_idx_packed;
153 uint16_t last_desc_idx_split;
154 uint16_t last_buffer_idx_packed;
159 * Structure contains variables relevant to RX/TX virtqueues.
161 struct vhost_virtqueue {
163 struct vring_desc *desc;
164 struct vring_packed_desc *desc_packed;
167 struct vring_avail *avail;
168 struct vring_packed_desc_event *driver_event;
171 struct vring_used *used;
172 struct vring_packed_desc_event *device_event;
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)
188 rte_spinlock_t access_lock;
192 struct vring_used_elem *shadow_used_split;
193 struct vring_used_elem_packed *shadow_used_packed;
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;
201 uint16_t batch_copy_nb_elems;
202 struct batch_copy_elem *batch_copy_elems;
204 bool used_wrap_counter;
205 bool avail_wrap_counter;
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;
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;
219 /* Used to notify the guest (trigger interrupt) */
221 /* Currently unused as polling mode is enabled */
224 /* inflight share memory info */
226 struct rte_vhost_inflight_info_split *inflight_split;
227 struct rte_vhost_inflight_info_packed *inflight_packed;
229 struct rte_vhost_resubmit_info *resubmit_inflight;
230 uint64_t global_counter;
232 struct vhost_async *async;
235 #define VIRTIO_UNINITIALIZED_NOTIF (-1)
237 struct vhost_vring_addr ring_addrs;
238 } __rte_cache_aligned;
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
249 #define VHOST_MAX_VRING 0x100
250 #define VHOST_MAX_QUEUE_PAIRS 0x80
252 /* Declare IOMMU related bits for older kernels */
253 #ifndef VIRTIO_F_IOMMU_PLATFORM
255 #define VIRTIO_F_IOMMU_PLATFORM 33
257 struct vhost_iotlb_msg {
261 #define VHOST_ACCESS_RO 0x1
262 #define VHOST_ACCESS_WO 0x2
263 #define VHOST_ACCESS_RW 0x3
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
272 #define VHOST_IOTLB_MSG 0x1
277 struct vhost_iotlb_msg iotlb;
284 * Define virtio 1.0 for older kernels
286 #ifndef VIRTIO_F_VERSION_1
287 #define VIRTIO_F_VERSION_1 32
290 /* Declare packed ring related bits for older kernels */
291 #ifndef VIRTIO_F_RING_PACKED
293 #define VIRTIO_F_RING_PACKED 34
295 struct vring_packed_desc {
302 struct vring_packed_desc_event {
309 * Declare below packed ring defines unconditionally
310 * as Kernel header might use different names.
312 #define VRING_DESC_F_AVAIL (1ULL << 7)
313 #define VRING_DESC_F_USED (1ULL << 15)
315 #define VRING_EVENT_F_ENABLE 0x0
316 #define VRING_EVENT_F_DISABLE 0x1
317 #define VRING_EVENT_F_DESC 0x2
320 * Available and used descs are in same order
322 #ifndef VIRTIO_F_IN_ORDER
323 #define VIRTIO_F_IN_ORDER 35
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))
356 uint64_t guest_phys_addr;
357 uint64_t host_phys_addr;
361 struct inflight_mem_info {
368 * Device structure contains all configuration information relating
372 /* Frontend (QEMU) memory and memory region information */
373 struct rte_vhost_memory *mem;
375 uint64_t protocol_features;
379 /* to tell if we need broadcast rarp packet */
380 int16_t broadcast_rarp;
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];
393 struct rte_ether_addr mac;
397 struct vhost_device_ops const *notify_ops;
399 uint32_t nr_guest_pages;
400 uint32_t max_guest_pages;
401 struct guest_page *guest_pages;
404 rte_spinlock_t slave_req_lock;
407 int postcopy_listening;
409 struct rte_vdpa_device *vdpa_dev;
411 /* context data for the external message handlers */
413 /* pre and post vhost user message handlers for the device */
414 struct rte_vhost_user_extern_ops extern_ops;
415 } __rte_cache_aligned;
417 static __rte_always_inline bool
418 vq_is_packed(struct virtio_net *dev)
420 return dev->features & (1ull << VIRTIO_F_RING_PACKED);
424 desc_is_avail(struct vring_packed_desc *desc, bool wrap_counter)
426 uint16_t flags = __atomic_load_n(&desc->flags, __ATOMIC_ACQUIRE);
428 return wrap_counter == !!(flags & VRING_DESC_F_AVAIL) &&
429 wrap_counter != !!(flags & VRING_DESC_F_USED);
433 vq_inc_last_used_packed(struct vhost_virtqueue *vq, uint16_t num)
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;
443 vq_inc_last_avail_packed(struct vhost_virtqueue *vq, uint16_t num)
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;
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);
464 static __rte_always_inline void
465 vhost_log_write(struct virtio_net *dev, uint64_t addr, uint64_t len)
467 if (unlikely(dev->features & (1ULL << VHOST_F_LOG_ALL)))
468 __vhost_log_write(dev, addr, len);
471 static __rte_always_inline void
472 vhost_log_cache_sync(struct virtio_net *dev, struct vhost_virtqueue *vq)
474 if (unlikely(dev->features & (1ULL << VHOST_F_LOG_ALL)))
475 __vhost_log_cache_sync(dev, vq);
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)
482 if (unlikely(dev->features & (1ULL << VHOST_F_LOG_ALL)))
483 __vhost_log_cache_write(dev, vq, addr, len);
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)
490 if (unlikely(dev->features & (1ULL << VHOST_F_LOG_ALL))) {
491 if (unlikely(vq->log_guest_addr == 0))
493 __vhost_log_cache_write(dev, vq, vq->log_guest_addr + offset,
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)
502 if (unlikely(dev->features & (1ULL << VHOST_F_LOG_ALL))) {
503 if (unlikely(vq->log_guest_addr == 0))
505 __vhost_log_write(dev, vq->log_guest_addr + offset, len);
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)
513 if (likely(!(dev->features & (1ULL << VHOST_F_LOG_ALL))))
516 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
517 __vhost_log_cache_write_iova(dev, vq, iova, len);
519 __vhost_log_cache_write(dev, vq, iova, len);
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)
526 if (likely(!(dev->features & (1ULL << VHOST_F_LOG_ALL))))
529 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
530 __vhost_log_write_iova(dev, vq, iova, len);
532 __vhost_log_write(dev, iova, len);
535 extern int vhost_config_log_level;
536 extern int vhost_data_log_level;
538 #define VHOST_LOG_CONFIG(level, fmt, args...) \
539 rte_log(RTE_LOG_ ## level, vhost_config_log_level, \
540 "VHOST_CONFIG: " fmt, ##args)
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) : \
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]; \
556 snprintf(packet, VHOST_MAX_PRINT_BUFF, "(%d) Header size %d: ", (device->vid), (size)); \
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]); \
563 snprintf(packet + strnlen(packet, VHOST_MAX_PRINT_BUFF), VHOST_MAX_PRINT_BUFF - strnlen(packet, VHOST_MAX_PRINT_BUFF), "\n"); \
565 VHOST_LOG_DATA(DEBUG, "%s", packet); \
568 #define PRINT_PACKET(device, addr, size, header) do {} while (0)
571 #define MAX_VHOST_DEVICE 1024
572 extern struct virtio_net *vhost_devices[MAX_VHOST_DEVICE];
574 #define VHOST_BINARY_SEARCH_THRESH 256
576 static __rte_always_inline int guest_page_addrcmp(const void *p1,
579 const struct guest_page *page1 = (const struct guest_page *)p1;
580 const struct guest_page *page2 = (const struct guest_page *)p2;
582 if (page1->guest_phys_addr > page2->guest_phys_addr)
584 if (page1->guest_phys_addr < page2->guest_phys_addr)
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)
595 struct guest_page *page;
596 struct guest_page key;
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);
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 +
610 *hpa_size = page->guest_phys_addr +
612 return gpa - page->guest_phys_addr +
613 page->host_phys_addr;
617 for (i = 0; i < dev->nr_guest_pages; i++) {
618 page = &dev->guest_pages[i];
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 +
627 *hpa_size = page->guest_phys_addr +
629 return gpa - page->guest_phys_addr +
630 page->host_phys_addr;
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)
647 hpa = gpa_to_first_hpa(dev, gpa, size, &hpa_size);
648 return hpa_size == size ? hpa : 0;
651 static __rte_always_inline uint64_t
652 hva_to_gpa(struct virtio_net *dev, uint64_t vva, uint64_t len)
654 struct rte_vhost_mem_region *r;
657 if (unlikely(!dev || !dev->mem))
660 for (i = 0; i < dev->mem->nregions; i++) {
661 r = &dev->mem->regions[i];
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;
671 static __rte_always_inline struct virtio_net *
674 struct virtio_net *dev = vhost_devices[vid];
676 if (unlikely(!dev)) {
677 VHOST_LOG_CONFIG(ERR,
678 "(%d) device not found.\n", vid);
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);
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);
694 int alloc_vring_queue(struct virtio_net *dev, uint32_t vring_idx);
696 void vhost_attach_vdpa_device(int vid, struct rte_vdpa_device *dev);
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);
705 struct vhost_device_ops const *vhost_driver_callback_get(const char *path);
708 * Backend-specific cleanup.
710 * TODO: fix it; we have one backend now
712 void vhost_backend_cleanup(struct virtio_net *dev);
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,
722 void vring_invalidate(struct virtio_net *dev, struct vhost_virtqueue *vq);
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)
728 if (!(dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)))
729 return rte_vhost_va_from_guest_pa(dev->mem, iova, len);
731 return __vhost_iova_to_vva(dev, vq, iova, len, perm);
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])
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
745 static __rte_always_inline int
746 vhost_need_event(uint16_t event_idx, uint16_t new_idx, uint16_t old)
748 return (uint16_t)(new_idx - event_idx - 1) < (uint16_t)(new_idx - old);
751 static __rte_always_inline void
752 vhost_vring_call_split(struct virtio_net *dev, struct vhost_virtqueue *vq)
754 /* Flush used->idx update before we read avail->flags. */
755 rte_atomic_thread_fence(__ATOMIC_SEQ_CST);
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;
763 vq->signalled_used = new;
764 vq->signalled_used_valid = true;
766 VHOST_LOG_DATA(DEBUG, "%s: used_event_idx=%d, old=%d, new=%d\n",
768 vhost_used_event(vq),
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);
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);
789 static __rte_always_inline void
790 vhost_vring_call_packed(struct virtio_net *dev, struct vhost_virtqueue *vq)
792 uint16_t old, new, off, off_wrap;
793 bool signalled_used_valid, kick = false;
795 /* Flush used desc update. */
796 rte_atomic_thread_fence(__ATOMIC_SEQ_CST);
798 if (!(dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))) {
799 if (vq->driver_event->flags !=
800 VRING_EVENT_F_DISABLE)
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;
811 if (vq->driver_event->flags != VRING_EVENT_F_DESC) {
812 if (vq->driver_event->flags != VRING_EVENT_F_DISABLE)
817 if (unlikely(!signalled_used_valid)) {
822 rte_atomic_thread_fence(__ATOMIC_ACQUIRE);
824 off_wrap = vq->driver_event->off_wrap;
825 off = off_wrap & ~(1 << 15);
830 if (vq->used_wrap_counter != off_wrap >> 15)
833 if (vhost_need_event(off, new, old))
837 eventfd_write(vq->callfd, (eventfd_t)1);
838 if (dev->notify_ops->guest_notified)
839 dev->notify_ops->guest_notified(dev->vid);
843 static __rte_always_inline void
844 free_ind_table(void *idesc)
849 static __rte_always_inline void
850 restore_mbuf(struct rte_mbuf *m)
852 uint32_t mbuf_size, priv_size;
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 */
859 m->buf_addr = (char *)m + mbuf_size;
860 m->buf_iova = rte_mempool_virt2iova(m) + mbuf_size;
865 static __rte_always_inline bool
866 mbuf_is_consumed(struct rte_mbuf *m)
869 if (rte_mbuf_refcnt_read(m) > 1)
877 #endif /* _VHOST_NET_CDEV_H_ */