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 "rte_vdpa_dev.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 1
31 /* Used to indicate that the device is ready to operate */
32 #define VIRTIO_DEV_READY 2
33 /* Used to indicate that the built-in vhost net device backend is enabled */
34 #define VIRTIO_DEV_BUILTIN_VIRTIO_NET 4
35 /* Used to indicate that the device has its own data path and configured */
36 #define VIRTIO_DEV_VDPA_CONFIGURED 8
37 /* Used to indicate that the feature negotiation failed */
38 #define VIRTIO_DEV_FEATURES_FAILED 16
40 /* Backend value set by guest. */
41 #define VIRTIO_DEV_STOPPED -1
43 #define BUF_VECTOR_MAX 256
45 #define VHOST_LOG_CACHE_NR 32
47 #define MAX_PKT_BURST 32
49 #define VHOST_MAX_ASYNC_IT (MAX_PKT_BURST * 2)
50 #define VHOST_MAX_ASYNC_VEC (BUF_VECTOR_MAX * 4)
52 #define PACKED_DESC_ENQUEUE_USED_FLAG(w) \
53 ((w) ? (VRING_DESC_F_AVAIL | VRING_DESC_F_USED | VRING_DESC_F_WRITE) : \
55 #define PACKED_DESC_DEQUEUE_USED_FLAG(w) \
56 ((w) ? (VRING_DESC_F_AVAIL | VRING_DESC_F_USED) : 0x0)
57 #define PACKED_DESC_SINGLE_DEQUEUE_FLAG (VRING_DESC_F_NEXT | \
58 VRING_DESC_F_INDIRECT)
60 #define PACKED_BATCH_SIZE (RTE_CACHE_LINE_SIZE / \
61 sizeof(struct vring_packed_desc))
62 #define PACKED_BATCH_MASK (PACKED_BATCH_SIZE - 1)
64 #ifdef VHOST_GCC_UNROLL_PRAGMA
65 #define vhost_for_each_try_unroll(iter, val, size) _Pragma("GCC unroll 4") \
66 for (iter = val; iter < size; iter++)
69 #ifdef VHOST_CLANG_UNROLL_PRAGMA
70 #define vhost_for_each_try_unroll(iter, val, size) _Pragma("unroll 4") \
71 for (iter = val; iter < size; iter++)
74 #ifdef VHOST_ICC_UNROLL_PRAGMA
75 #define vhost_for_each_try_unroll(iter, val, size) _Pragma("unroll (4)") \
76 for (iter = val; iter < size; iter++)
79 #ifndef vhost_for_each_try_unroll
80 #define vhost_for_each_try_unroll(iter, val, num) \
81 for (iter = val; iter < num; iter++)
85 * Structure contains buffer address, length and descriptor index
86 * from vring to do scatter RX.
96 * Structure contains the info for each batched memory copy.
98 struct batch_copy_elem {
106 * Structure that contains the info for batched dirty logging.
108 struct log_cache_entry {
113 struct vring_used_elem_packed {
121 * Structure contains variables relevant to RX/TX virtqueues.
123 struct vhost_virtqueue {
125 struct vring_desc *desc;
126 struct vring_packed_desc *desc_packed;
129 struct vring_avail *avail;
130 struct vring_packed_desc_event *driver_event;
133 struct vring_used *used;
134 struct vring_packed_desc_event *device_event;
138 uint16_t last_avail_idx;
139 uint16_t last_used_idx;
140 /* Last used index we notify to front end. */
141 uint16_t signalled_used;
142 bool signalled_used_valid;
143 #define VIRTIO_INVALID_EVENTFD (-1)
144 #define VIRTIO_UNINITIALIZED_EVENTFD (-2)
150 rte_spinlock_t access_lock;
154 struct vring_used_elem *shadow_used_split;
155 struct vring_used_elem_packed *shadow_used_packed;
157 uint16_t shadow_used_idx;
158 /* Record packed ring enqueue latest desc cache aligned index */
159 uint16_t shadow_aligned_idx;
160 /* Record packed ring first dequeue desc index */
161 uint16_t shadow_last_used_idx;
163 uint16_t batch_copy_nb_elems;
164 struct batch_copy_elem *batch_copy_elems;
165 bool used_wrap_counter;
166 bool avail_wrap_counter;
168 /* Physical address of used ring, for logging */
169 uint16_t log_cache_nb_elem;
170 uint64_t log_guest_addr;
171 struct log_cache_entry *log_cache;
173 rte_rwlock_t iotlb_lock;
174 rte_rwlock_t iotlb_pending_lock;
175 struct rte_mempool *iotlb_pool;
176 TAILQ_HEAD(, vhost_iotlb_entry) iotlb_list;
177 TAILQ_HEAD(, vhost_iotlb_entry) iotlb_pending_list;
180 /* Used to notify the guest (trigger interrupt) */
182 /* Currently unused as polling mode is enabled */
185 /* inflight share memory info */
187 struct rte_vhost_inflight_info_split *inflight_split;
188 struct rte_vhost_inflight_info_packed *inflight_packed;
190 struct rte_vhost_resubmit_info *resubmit_inflight;
191 uint64_t global_counter;
193 /* operation callbacks for async dma */
194 struct rte_vhost_async_channel_ops async_ops;
196 struct rte_vhost_iov_iter *it_pool;
197 struct iovec *vec_pool;
199 /* async data transfer status */
200 struct async_inflight_info *async_pkts_info;
201 uint16_t async_pkts_idx;
202 uint16_t async_pkts_inflight_n;
203 uint16_t async_last_pkts_n;
204 struct vring_used_elem *async_descs_split;
205 uint16_t async_desc_idx;
206 uint16_t last_async_desc_idx;
208 /* vq async features */
210 bool async_registered;
211 uint16_t async_threshold;
214 #define VIRTIO_UNINITIALIZED_NOTIF (-1)
216 struct vhost_vring_addr ring_addrs;
217 } __rte_cache_aligned;
219 /* Virtio device status as per Virtio specification */
220 #define VIRTIO_DEVICE_STATUS_RESET 0x00
221 #define VIRTIO_DEVICE_STATUS_ACK 0x01
222 #define VIRTIO_DEVICE_STATUS_DRIVER 0x02
223 #define VIRTIO_DEVICE_STATUS_DRIVER_OK 0x04
224 #define VIRTIO_DEVICE_STATUS_FEATURES_OK 0x08
225 #define VIRTIO_DEVICE_STATUS_DEV_NEED_RESET 0x40
226 #define VIRTIO_DEVICE_STATUS_FAILED 0x80
228 #define VHOST_MAX_VRING 0x100
229 #define VHOST_MAX_QUEUE_PAIRS 0x80
231 /* Declare IOMMU related bits for older kernels */
232 #ifndef VIRTIO_F_IOMMU_PLATFORM
234 #define VIRTIO_F_IOMMU_PLATFORM 33
236 struct vhost_iotlb_msg {
240 #define VHOST_ACCESS_RO 0x1
241 #define VHOST_ACCESS_WO 0x2
242 #define VHOST_ACCESS_RW 0x3
244 #define VHOST_IOTLB_MISS 1
245 #define VHOST_IOTLB_UPDATE 2
246 #define VHOST_IOTLB_INVALIDATE 3
247 #define VHOST_IOTLB_ACCESS_FAIL 4
251 #define VHOST_IOTLB_MSG 0x1
256 struct vhost_iotlb_msg iotlb;
263 * Define virtio 1.0 for older kernels
265 #ifndef VIRTIO_F_VERSION_1
266 #define VIRTIO_F_VERSION_1 32
269 /* Declare packed ring related bits for older kernels */
270 #ifndef VIRTIO_F_RING_PACKED
272 #define VIRTIO_F_RING_PACKED 34
274 struct vring_packed_desc {
281 struct vring_packed_desc_event {
288 * Declare below packed ring defines unconditionally
289 * as Kernel header might use different names.
291 #define VRING_DESC_F_AVAIL (1ULL << 7)
292 #define VRING_DESC_F_USED (1ULL << 15)
294 #define VRING_EVENT_F_ENABLE 0x0
295 #define VRING_EVENT_F_DISABLE 0x1
296 #define VRING_EVENT_F_DESC 0x2
299 * Available and used descs are in same order
301 #ifndef VIRTIO_F_IN_ORDER
302 #define VIRTIO_F_IN_ORDER 35
305 /* Features supported by this builtin vhost-user net driver. */
306 #define VIRTIO_NET_SUPPORTED_FEATURES ((1ULL << VIRTIO_NET_F_MRG_RXBUF) | \
307 (1ULL << VIRTIO_F_ANY_LAYOUT) | \
308 (1ULL << VIRTIO_NET_F_CTRL_VQ) | \
309 (1ULL << VIRTIO_NET_F_CTRL_RX) | \
310 (1ULL << VIRTIO_NET_F_GUEST_ANNOUNCE) | \
311 (1ULL << VIRTIO_NET_F_MQ) | \
312 (1ULL << VIRTIO_F_VERSION_1) | \
313 (1ULL << VHOST_F_LOG_ALL) | \
314 (1ULL << VHOST_USER_F_PROTOCOL_FEATURES) | \
315 (1ULL << VIRTIO_NET_F_GSO) | \
316 (1ULL << VIRTIO_NET_F_HOST_TSO4) | \
317 (1ULL << VIRTIO_NET_F_HOST_TSO6) | \
318 (1ULL << VIRTIO_NET_F_HOST_UFO) | \
319 (1ULL << VIRTIO_NET_F_HOST_ECN) | \
320 (1ULL << VIRTIO_NET_F_CSUM) | \
321 (1ULL << VIRTIO_NET_F_GUEST_CSUM) | \
322 (1ULL << VIRTIO_NET_F_GUEST_TSO4) | \
323 (1ULL << VIRTIO_NET_F_GUEST_TSO6) | \
324 (1ULL << VIRTIO_NET_F_GUEST_UFO) | \
325 (1ULL << VIRTIO_NET_F_GUEST_ECN) | \
326 (1ULL << VIRTIO_RING_F_INDIRECT_DESC) | \
327 (1ULL << VIRTIO_RING_F_EVENT_IDX) | \
328 (1ULL << VIRTIO_NET_F_MTU) | \
329 (1ULL << VIRTIO_F_IN_ORDER) | \
330 (1ULL << VIRTIO_F_IOMMU_PLATFORM) | \
331 (1ULL << VIRTIO_F_RING_PACKED))
335 uint64_t guest_phys_addr;
336 uint64_t host_phys_addr;
340 struct inflight_mem_info {
347 * Device structure contains all configuration information relating
351 /* Frontend (QEMU) memory and memory region information */
352 struct rte_vhost_memory *mem;
354 uint64_t protocol_features;
358 /* to tell if we need broadcast rarp packet */
359 int16_t broadcast_rarp;
364 struct vhost_virtqueue *virtqueue[VHOST_MAX_QUEUE_PAIRS * 2];
365 struct inflight_mem_info *inflight_info;
366 #define IF_NAME_SZ (PATH_MAX > IFNAMSIZ ? PATH_MAX : IFNAMSIZ)
367 char ifname[IF_NAME_SZ];
371 struct rte_ether_addr mac;
375 struct vhost_device_ops const *notify_ops;
377 uint32_t nr_guest_pages;
378 uint32_t max_guest_pages;
379 struct guest_page *guest_pages;
382 rte_spinlock_t slave_req_lock;
385 int postcopy_listening;
387 struct rte_vdpa_device *vdpa_dev;
389 /* context data for the external message handlers */
391 /* pre and post vhost user message handlers for the device */
392 struct rte_vhost_user_extern_ops extern_ops;
393 } __rte_cache_aligned;
395 static __rte_always_inline bool
396 vq_is_packed(struct virtio_net *dev)
398 return dev->features & (1ull << VIRTIO_F_RING_PACKED);
402 desc_is_avail(struct vring_packed_desc *desc, bool wrap_counter)
404 uint16_t flags = __atomic_load_n(&desc->flags, __ATOMIC_ACQUIRE);
406 return wrap_counter == !!(flags & VRING_DESC_F_AVAIL) &&
407 wrap_counter != !!(flags & VRING_DESC_F_USED);
411 vq_inc_last_used_packed(struct vhost_virtqueue *vq, uint16_t num)
413 vq->last_used_idx += num;
414 if (vq->last_used_idx >= vq->size) {
415 vq->used_wrap_counter ^= 1;
416 vq->last_used_idx -= vq->size;
421 vq_inc_last_avail_packed(struct vhost_virtqueue *vq, uint16_t num)
423 vq->last_avail_idx += num;
424 if (vq->last_avail_idx >= vq->size) {
425 vq->avail_wrap_counter ^= 1;
426 vq->last_avail_idx -= vq->size;
430 void __vhost_log_cache_write(struct virtio_net *dev,
431 struct vhost_virtqueue *vq,
432 uint64_t addr, uint64_t len);
433 void __vhost_log_cache_write_iova(struct virtio_net *dev,
434 struct vhost_virtqueue *vq,
435 uint64_t iova, uint64_t len);
436 void __vhost_log_cache_sync(struct virtio_net *dev,
437 struct vhost_virtqueue *vq);
438 void __vhost_log_write(struct virtio_net *dev, uint64_t addr, uint64_t len);
439 void __vhost_log_write_iova(struct virtio_net *dev, struct vhost_virtqueue *vq,
440 uint64_t iova, uint64_t len);
442 static __rte_always_inline void
443 vhost_log_write(struct virtio_net *dev, uint64_t addr, uint64_t len)
445 if (unlikely(dev->features & (1ULL << VHOST_F_LOG_ALL)))
446 __vhost_log_write(dev, addr, len);
449 static __rte_always_inline void
450 vhost_log_cache_sync(struct virtio_net *dev, struct vhost_virtqueue *vq)
452 if (unlikely(dev->features & (1ULL << VHOST_F_LOG_ALL)))
453 __vhost_log_cache_sync(dev, vq);
456 static __rte_always_inline void
457 vhost_log_cache_write(struct virtio_net *dev, struct vhost_virtqueue *vq,
458 uint64_t addr, uint64_t len)
460 if (unlikely(dev->features & (1ULL << VHOST_F_LOG_ALL)))
461 __vhost_log_cache_write(dev, vq, addr, len);
464 static __rte_always_inline void
465 vhost_log_cache_used_vring(struct virtio_net *dev, struct vhost_virtqueue *vq,
466 uint64_t offset, uint64_t len)
468 if (unlikely(dev->features & (1ULL << VHOST_F_LOG_ALL))) {
469 if (unlikely(vq->log_guest_addr == 0))
471 __vhost_log_cache_write(dev, vq, vq->log_guest_addr + offset,
476 static __rte_always_inline void
477 vhost_log_used_vring(struct virtio_net *dev, struct vhost_virtqueue *vq,
478 uint64_t offset, uint64_t len)
480 if (unlikely(dev->features & (1ULL << VHOST_F_LOG_ALL))) {
481 if (unlikely(vq->log_guest_addr == 0))
483 __vhost_log_write(dev, vq->log_guest_addr + offset, len);
487 static __rte_always_inline void
488 vhost_log_cache_write_iova(struct virtio_net *dev, struct vhost_virtqueue *vq,
489 uint64_t iova, uint64_t len)
491 if (likely(!(dev->features & (1ULL << VHOST_F_LOG_ALL))))
494 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
495 __vhost_log_cache_write_iova(dev, vq, iova, len);
497 __vhost_log_cache_write(dev, vq, iova, len);
500 static __rte_always_inline void
501 vhost_log_write_iova(struct virtio_net *dev, struct vhost_virtqueue *vq,
502 uint64_t iova, uint64_t len)
504 if (likely(!(dev->features & (1ULL << VHOST_F_LOG_ALL))))
507 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
508 __vhost_log_write_iova(dev, vq, iova, len);
510 __vhost_log_write(dev, iova, len);
513 extern int vhost_config_log_level;
514 extern int vhost_data_log_level;
516 #define VHOST_LOG_CONFIG(level, fmt, args...) \
517 rte_log(RTE_LOG_ ## level, vhost_config_log_level, \
518 "VHOST_CONFIG: " fmt, ##args)
520 #define VHOST_LOG_DATA(level, fmt, args...) \
521 (void)((RTE_LOG_ ## level <= RTE_LOG_DP_LEVEL) ? \
522 rte_log(RTE_LOG_ ## level, vhost_data_log_level, \
523 "VHOST_DATA : " fmt, ##args) : \
526 #ifdef RTE_LIBRTE_VHOST_DEBUG
527 #define VHOST_MAX_PRINT_BUFF 6072
528 #define PRINT_PACKET(device, addr, size, header) do { \
529 char *pkt_addr = (char *)(addr); \
530 unsigned int index; \
531 char packet[VHOST_MAX_PRINT_BUFF]; \
534 snprintf(packet, VHOST_MAX_PRINT_BUFF, "(%d) Header size %d: ", (device->vid), (size)); \
536 snprintf(packet, VHOST_MAX_PRINT_BUFF, "(%d) Packet size %d: ", (device->vid), (size)); \
537 for (index = 0; index < (size); index++) { \
538 snprintf(packet + strnlen(packet, VHOST_MAX_PRINT_BUFF), VHOST_MAX_PRINT_BUFF - strnlen(packet, VHOST_MAX_PRINT_BUFF), \
539 "%02hhx ", pkt_addr[index]); \
541 snprintf(packet + strnlen(packet, VHOST_MAX_PRINT_BUFF), VHOST_MAX_PRINT_BUFF - strnlen(packet, VHOST_MAX_PRINT_BUFF), "\n"); \
543 VHOST_LOG_DATA(DEBUG, "%s", packet); \
546 #define PRINT_PACKET(device, addr, size, header) do {} while (0)
549 #define MAX_VHOST_DEVICE 1024
550 extern struct virtio_net *vhost_devices[MAX_VHOST_DEVICE];
552 #define VHOST_BINARY_SEARCH_THRESH 256
554 static __rte_always_inline int guest_page_addrcmp(const void *p1,
557 const struct guest_page *page1 = (const struct guest_page *)p1;
558 const struct guest_page *page2 = (const struct guest_page *)p2;
560 if (page1->guest_phys_addr > page2->guest_phys_addr)
562 if (page1->guest_phys_addr < page2->guest_phys_addr)
568 static __rte_always_inline rte_iova_t
569 gpa_to_first_hpa(struct virtio_net *dev, uint64_t gpa,
570 uint64_t gpa_size, uint64_t *hpa_size)
573 struct guest_page *page;
574 struct guest_page key;
576 *hpa_size = gpa_size;
577 if (dev->nr_guest_pages >= VHOST_BINARY_SEARCH_THRESH) {
578 key.guest_phys_addr = gpa & ~(dev->guest_pages[0].size - 1);
579 page = bsearch(&key, dev->guest_pages, dev->nr_guest_pages,
580 sizeof(struct guest_page), guest_page_addrcmp);
582 if (gpa + gpa_size <=
583 page->guest_phys_addr + page->size) {
584 return gpa - page->guest_phys_addr +
585 page->host_phys_addr;
586 } else if (gpa < page->guest_phys_addr +
588 *hpa_size = page->guest_phys_addr +
590 return gpa - page->guest_phys_addr +
591 page->host_phys_addr;
595 for (i = 0; i < dev->nr_guest_pages; i++) {
596 page = &dev->guest_pages[i];
598 if (gpa >= page->guest_phys_addr) {
599 if (gpa + gpa_size <=
600 page->guest_phys_addr + page->size) {
601 return gpa - page->guest_phys_addr +
602 page->host_phys_addr;
603 } else if (gpa < page->guest_phys_addr +
605 *hpa_size = page->guest_phys_addr +
607 return gpa - page->guest_phys_addr +
608 page->host_phys_addr;
618 /* Convert guest physical address to host physical address */
619 static __rte_always_inline rte_iova_t
620 gpa_to_hpa(struct virtio_net *dev, uint64_t gpa, uint64_t size)
625 hpa = gpa_to_first_hpa(dev, gpa, size, &hpa_size);
626 return hpa_size == size ? hpa : 0;
629 static __rte_always_inline uint64_t
630 hva_to_gpa(struct virtio_net *dev, uint64_t vva, uint64_t len)
632 struct rte_vhost_mem_region *r;
635 if (unlikely(!dev || !dev->mem))
638 for (i = 0; i < dev->mem->nregions; i++) {
639 r = &dev->mem->regions[i];
641 if (vva >= r->host_user_addr &&
642 vva + len < r->host_user_addr + r->size) {
643 return r->guest_phys_addr + vva - r->host_user_addr;
649 static __rte_always_inline struct virtio_net *
652 struct virtio_net *dev = vhost_devices[vid];
654 if (unlikely(!dev)) {
655 VHOST_LOG_CONFIG(ERR,
656 "(%d) device not found.\n", vid);
662 int vhost_new_device(void);
663 void cleanup_device(struct virtio_net *dev, int destroy);
664 void reset_device(struct virtio_net *dev);
665 void vhost_destroy_device(int);
666 void vhost_destroy_device_notify(struct virtio_net *dev);
668 void cleanup_vq(struct vhost_virtqueue *vq, int destroy);
669 void cleanup_vq_inflight(struct virtio_net *dev, struct vhost_virtqueue *vq);
670 void free_vq(struct virtio_net *dev, struct vhost_virtqueue *vq);
672 int alloc_vring_queue(struct virtio_net *dev, uint32_t vring_idx);
674 void vhost_attach_vdpa_device(int vid, struct rte_vdpa_device *dev);
676 void vhost_set_ifname(int, const char *if_name, unsigned int if_len);
677 void vhost_set_builtin_virtio_net(int vid, bool enable);
678 void vhost_enable_extbuf(int vid);
679 void vhost_enable_linearbuf(int vid);
680 int vhost_enable_guest_notification(struct virtio_net *dev,
681 struct vhost_virtqueue *vq, int enable);
683 struct vhost_device_ops const *vhost_driver_callback_get(const char *path);
686 * Backend-specific cleanup.
688 * TODO: fix it; we have one backend now
690 void vhost_backend_cleanup(struct virtio_net *dev);
692 uint64_t __vhost_iova_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
693 uint64_t iova, uint64_t *len, uint8_t perm);
694 void *vhost_alloc_copy_ind_table(struct virtio_net *dev,
695 struct vhost_virtqueue *vq,
696 uint64_t desc_addr, uint64_t desc_len);
697 int vring_translate(struct virtio_net *dev, struct vhost_virtqueue *vq);
698 uint64_t translate_log_addr(struct virtio_net *dev, struct vhost_virtqueue *vq,
700 void vring_invalidate(struct virtio_net *dev, struct vhost_virtqueue *vq);
702 static __rte_always_inline uint64_t
703 vhost_iova_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
704 uint64_t iova, uint64_t *len, uint8_t perm)
706 if (!(dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)))
707 return rte_vhost_va_from_guest_pa(dev->mem, iova, len);
709 return __vhost_iova_to_vva(dev, vq, iova, len, perm);
712 #define vhost_avail_event(vr) \
713 (*(volatile uint16_t*)&(vr)->used->ring[(vr)->size])
714 #define vhost_used_event(vr) \
715 (*(volatile uint16_t*)&(vr)->avail->ring[(vr)->size])
718 * The following is used with VIRTIO_RING_F_EVENT_IDX.
719 * Assuming a given event_idx value from the other size, if we have
720 * just incremented index from old to new_idx, should we trigger an
723 static __rte_always_inline int
724 vhost_need_event(uint16_t event_idx, uint16_t new_idx, uint16_t old)
726 return (uint16_t)(new_idx - event_idx - 1) < (uint16_t)(new_idx - old);
729 static __rte_always_inline void
730 vhost_vring_call_split(struct virtio_net *dev, struct vhost_virtqueue *vq)
732 /* Flush used->idx update before we read avail->flags. */
733 rte_atomic_thread_fence(__ATOMIC_SEQ_CST);
735 /* Don't kick guest if we don't reach index specified by guest. */
736 if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX)) {
737 uint16_t old = vq->signalled_used;
738 uint16_t new = vq->last_used_idx;
739 bool signalled_used_valid = vq->signalled_used_valid;
741 vq->signalled_used = new;
742 vq->signalled_used_valid = true;
744 VHOST_LOG_DATA(DEBUG, "%s: used_event_idx=%d, old=%d, new=%d\n",
746 vhost_used_event(vq),
749 if ((vhost_need_event(vhost_used_event(vq), new, old) &&
750 (vq->callfd >= 0)) ||
751 unlikely(!signalled_used_valid)) {
752 eventfd_write(vq->callfd, (eventfd_t) 1);
753 if (dev->notify_ops->guest_notified)
754 dev->notify_ops->guest_notified(dev->vid);
757 /* Kick the guest if necessary. */
758 if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT)
759 && (vq->callfd >= 0)) {
760 eventfd_write(vq->callfd, (eventfd_t)1);
761 if (dev->notify_ops->guest_notified)
762 dev->notify_ops->guest_notified(dev->vid);
767 static __rte_always_inline void
768 vhost_vring_call_packed(struct virtio_net *dev, struct vhost_virtqueue *vq)
770 uint16_t old, new, off, off_wrap;
771 bool signalled_used_valid, kick = false;
773 /* Flush used desc update. */
774 rte_atomic_thread_fence(__ATOMIC_SEQ_CST);
776 if (!(dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))) {
777 if (vq->driver_event->flags !=
778 VRING_EVENT_F_DISABLE)
783 old = vq->signalled_used;
784 new = vq->last_used_idx;
785 vq->signalled_used = new;
786 signalled_used_valid = vq->signalled_used_valid;
787 vq->signalled_used_valid = true;
789 if (vq->driver_event->flags != VRING_EVENT_F_DESC) {
790 if (vq->driver_event->flags != VRING_EVENT_F_DISABLE)
795 if (unlikely(!signalled_used_valid)) {
800 rte_atomic_thread_fence(__ATOMIC_ACQUIRE);
802 off_wrap = vq->driver_event->off_wrap;
803 off = off_wrap & ~(1 << 15);
808 if (vq->used_wrap_counter != off_wrap >> 15)
811 if (vhost_need_event(off, new, old))
815 eventfd_write(vq->callfd, (eventfd_t)1);
816 if (dev->notify_ops->guest_notified)
817 dev->notify_ops->guest_notified(dev->vid);
821 static __rte_always_inline void
822 free_ind_table(void *idesc)
827 static __rte_always_inline void
828 restore_mbuf(struct rte_mbuf *m)
830 uint32_t mbuf_size, priv_size;
833 priv_size = rte_pktmbuf_priv_size(m->pool);
834 mbuf_size = sizeof(struct rte_mbuf) + priv_size;
835 /* start of buffer is after mbuf structure and priv data */
837 m->buf_addr = (char *)m + mbuf_size;
838 m->buf_iova = rte_mempool_virt2iova(m) + mbuf_size;
843 static __rte_always_inline bool
844 mbuf_is_consumed(struct rte_mbuf *m)
847 if (rte_mbuf_refcnt_read(m) > 1)
855 #endif /* _VHOST_NET_CDEV_H_ */