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)
146 /* Backend value to determine if device should started/stopped */
152 #define VIRTIO_UNINITIALIZED_NOTIF (-1)
154 rte_spinlock_t access_lock;
156 /* Used to notify the guest (trigger interrupt) */
158 /* Currently unused as polling mode is enabled */
161 /* Physical address of used ring, for logging */
162 uint64_t log_guest_addr;
164 /* inflight share memory info */
166 struct rte_vhost_inflight_info_split *inflight_split;
167 struct rte_vhost_inflight_info_packed *inflight_packed;
169 struct rte_vhost_resubmit_info *resubmit_inflight;
170 uint64_t global_counter;
173 struct vring_used_elem *shadow_used_split;
174 struct vring_used_elem_packed *shadow_used_packed;
176 uint16_t shadow_used_idx;
177 /* Record packed ring enqueue latest desc cache aligned index */
178 uint16_t shadow_aligned_idx;
179 /* Record packed ring first dequeue desc index */
180 uint16_t shadow_last_used_idx;
181 struct vhost_vring_addr ring_addrs;
183 struct batch_copy_elem *batch_copy_elems;
184 uint16_t batch_copy_nb_elems;
185 bool used_wrap_counter;
186 bool avail_wrap_counter;
188 struct log_cache_entry log_cache[VHOST_LOG_CACHE_NR];
189 uint16_t log_cache_nb_elem;
191 rte_rwlock_t iotlb_lock;
192 rte_rwlock_t iotlb_pending_lock;
193 struct rte_mempool *iotlb_pool;
194 TAILQ_HEAD(, vhost_iotlb_entry) iotlb_list;
196 TAILQ_HEAD(, vhost_iotlb_entry) iotlb_pending_list;
198 /* operation callbacks for async dma */
199 struct rte_vhost_async_channel_ops async_ops;
201 struct rte_vhost_iov_iter *it_pool;
202 struct iovec *vec_pool;
204 /* async data transfer status */
205 uintptr_t **async_pkts_pending;
206 struct async_inflight_info *async_pkts_info;
207 uint16_t async_pkts_idx;
208 uint16_t async_pkts_inflight_n;
209 uint16_t async_last_pkts_n;
211 /* vq async features */
213 bool async_registered;
214 uint16_t async_threshold;
215 } __rte_cache_aligned;
217 /* Virtio device status as per Virtio specification */
218 #define VIRTIO_DEVICE_STATUS_RESET 0x00
219 #define VIRTIO_DEVICE_STATUS_ACK 0x01
220 #define VIRTIO_DEVICE_STATUS_DRIVER 0x02
221 #define VIRTIO_DEVICE_STATUS_DRIVER_OK 0x04
222 #define VIRTIO_DEVICE_STATUS_FEATURES_OK 0x08
223 #define VIRTIO_DEVICE_STATUS_DEV_NEED_RESET 0x40
224 #define VIRTIO_DEVICE_STATUS_FAILED 0x80
226 #define VHOST_MAX_VRING 0x100
227 #define VHOST_MAX_QUEUE_PAIRS 0x80
229 /* Declare IOMMU related bits for older kernels */
230 #ifndef VIRTIO_F_IOMMU_PLATFORM
232 #define VIRTIO_F_IOMMU_PLATFORM 33
234 struct vhost_iotlb_msg {
238 #define VHOST_ACCESS_RO 0x1
239 #define VHOST_ACCESS_WO 0x2
240 #define VHOST_ACCESS_RW 0x3
242 #define VHOST_IOTLB_MISS 1
243 #define VHOST_IOTLB_UPDATE 2
244 #define VHOST_IOTLB_INVALIDATE 3
245 #define VHOST_IOTLB_ACCESS_FAIL 4
249 #define VHOST_IOTLB_MSG 0x1
254 struct vhost_iotlb_msg iotlb;
261 * Define virtio 1.0 for older kernels
263 #ifndef VIRTIO_F_VERSION_1
264 #define VIRTIO_F_VERSION_1 32
267 /* Declare packed ring related bits for older kernels */
268 #ifndef VIRTIO_F_RING_PACKED
270 #define VIRTIO_F_RING_PACKED 34
272 struct vring_packed_desc {
279 struct vring_packed_desc_event {
286 * Declare below packed ring defines unconditionally
287 * as Kernel header might use different names.
289 #define VRING_DESC_F_AVAIL (1ULL << 7)
290 #define VRING_DESC_F_USED (1ULL << 15)
292 #define VRING_EVENT_F_ENABLE 0x0
293 #define VRING_EVENT_F_DISABLE 0x1
294 #define VRING_EVENT_F_DESC 0x2
297 * Available and used descs are in same order
299 #ifndef VIRTIO_F_IN_ORDER
300 #define VIRTIO_F_IN_ORDER 35
303 /* Features supported by this builtin vhost-user net driver. */
304 #define VIRTIO_NET_SUPPORTED_FEATURES ((1ULL << VIRTIO_NET_F_MRG_RXBUF) | \
305 (1ULL << VIRTIO_F_ANY_LAYOUT) | \
306 (1ULL << VIRTIO_NET_F_CTRL_VQ) | \
307 (1ULL << VIRTIO_NET_F_CTRL_RX) | \
308 (1ULL << VIRTIO_NET_F_GUEST_ANNOUNCE) | \
309 (1ULL << VIRTIO_NET_F_MQ) | \
310 (1ULL << VIRTIO_F_VERSION_1) | \
311 (1ULL << VHOST_F_LOG_ALL) | \
312 (1ULL << VHOST_USER_F_PROTOCOL_FEATURES) | \
313 (1ULL << VIRTIO_NET_F_GSO) | \
314 (1ULL << VIRTIO_NET_F_HOST_TSO4) | \
315 (1ULL << VIRTIO_NET_F_HOST_TSO6) | \
316 (1ULL << VIRTIO_NET_F_HOST_UFO) | \
317 (1ULL << VIRTIO_NET_F_HOST_ECN) | \
318 (1ULL << VIRTIO_NET_F_CSUM) | \
319 (1ULL << VIRTIO_NET_F_GUEST_CSUM) | \
320 (1ULL << VIRTIO_NET_F_GUEST_TSO4) | \
321 (1ULL << VIRTIO_NET_F_GUEST_TSO6) | \
322 (1ULL << VIRTIO_NET_F_GUEST_UFO) | \
323 (1ULL << VIRTIO_NET_F_GUEST_ECN) | \
324 (1ULL << VIRTIO_RING_F_INDIRECT_DESC) | \
325 (1ULL << VIRTIO_RING_F_EVENT_IDX) | \
326 (1ULL << VIRTIO_NET_F_MTU) | \
327 (1ULL << VIRTIO_F_IN_ORDER) | \
328 (1ULL << VIRTIO_F_IOMMU_PLATFORM) | \
329 (1ULL << VIRTIO_F_RING_PACKED))
333 uint64_t guest_phys_addr;
334 uint64_t host_phys_addr;
338 struct inflight_mem_info {
345 * Device structure contains all configuration information relating
349 /* Frontend (QEMU) memory and memory region information */
350 struct rte_vhost_memory *mem;
352 uint64_t protocol_features;
356 /* to tell if we need broadcast rarp packet */
357 int16_t broadcast_rarp;
362 struct vhost_virtqueue *virtqueue[VHOST_MAX_QUEUE_PAIRS * 2];
363 struct inflight_mem_info *inflight_info;
364 #define IF_NAME_SZ (PATH_MAX > IFNAMSIZ ? PATH_MAX : IFNAMSIZ)
365 char ifname[IF_NAME_SZ];
369 struct rte_ether_addr mac;
373 struct vhost_device_ops const *notify_ops;
375 uint32_t nr_guest_pages;
376 uint32_t max_guest_pages;
377 struct guest_page *guest_pages;
380 rte_spinlock_t slave_req_lock;
383 int postcopy_listening;
385 struct rte_vdpa_device *vdpa_dev;
387 /* context data for the external message handlers */
389 /* pre and post vhost user message handlers for the device */
390 struct rte_vhost_user_extern_ops extern_ops;
391 } __rte_cache_aligned;
393 static __rte_always_inline bool
394 vq_is_packed(struct virtio_net *dev)
396 return dev->features & (1ull << VIRTIO_F_RING_PACKED);
400 desc_is_avail(struct vring_packed_desc *desc, bool wrap_counter)
402 uint16_t flags = __atomic_load_n(&desc->flags, __ATOMIC_ACQUIRE);
404 return wrap_counter == !!(flags & VRING_DESC_F_AVAIL) &&
405 wrap_counter != !!(flags & VRING_DESC_F_USED);
409 vq_inc_last_used_packed(struct vhost_virtqueue *vq, uint16_t num)
411 vq->last_used_idx += num;
412 if (vq->last_used_idx >= vq->size) {
413 vq->used_wrap_counter ^= 1;
414 vq->last_used_idx -= vq->size;
419 vq_inc_last_avail_packed(struct vhost_virtqueue *vq, uint16_t num)
421 vq->last_avail_idx += num;
422 if (vq->last_avail_idx >= vq->size) {
423 vq->avail_wrap_counter ^= 1;
424 vq->last_avail_idx -= vq->size;
428 void __vhost_log_cache_write(struct virtio_net *dev,
429 struct vhost_virtqueue *vq,
430 uint64_t addr, uint64_t len);
431 void __vhost_log_cache_write_iova(struct virtio_net *dev,
432 struct vhost_virtqueue *vq,
433 uint64_t iova, uint64_t len);
434 void __vhost_log_cache_sync(struct virtio_net *dev,
435 struct vhost_virtqueue *vq);
436 void __vhost_log_write(struct virtio_net *dev, uint64_t addr, uint64_t len);
437 void __vhost_log_write_iova(struct virtio_net *dev, struct vhost_virtqueue *vq,
438 uint64_t iova, uint64_t len);
440 static __rte_always_inline void
441 vhost_log_write(struct virtio_net *dev, uint64_t addr, uint64_t len)
443 if (unlikely(dev->features & (1ULL << VHOST_F_LOG_ALL)))
444 __vhost_log_write(dev, addr, len);
447 static __rte_always_inline void
448 vhost_log_cache_sync(struct virtio_net *dev, struct vhost_virtqueue *vq)
450 if (unlikely(dev->features & (1ULL << VHOST_F_LOG_ALL)))
451 __vhost_log_cache_sync(dev, vq);
454 static __rte_always_inline void
455 vhost_log_cache_write(struct virtio_net *dev, struct vhost_virtqueue *vq,
456 uint64_t addr, uint64_t len)
458 if (unlikely(dev->features & (1ULL << VHOST_F_LOG_ALL)))
459 __vhost_log_cache_write(dev, vq, addr, len);
462 static __rte_always_inline void
463 vhost_log_cache_used_vring(struct virtio_net *dev, struct vhost_virtqueue *vq,
464 uint64_t offset, uint64_t len)
466 if (unlikely(dev->features & (1ULL << VHOST_F_LOG_ALL))) {
467 if (unlikely(vq->log_guest_addr == 0))
469 __vhost_log_cache_write(dev, vq, vq->log_guest_addr + offset,
474 static __rte_always_inline void
475 vhost_log_used_vring(struct virtio_net *dev, struct vhost_virtqueue *vq,
476 uint64_t offset, uint64_t len)
478 if (unlikely(dev->features & (1ULL << VHOST_F_LOG_ALL))) {
479 if (unlikely(vq->log_guest_addr == 0))
481 __vhost_log_write(dev, vq->log_guest_addr + offset, len);
485 static __rte_always_inline void
486 vhost_log_cache_write_iova(struct virtio_net *dev, struct vhost_virtqueue *vq,
487 uint64_t iova, uint64_t len)
489 if (likely(!(dev->features & (1ULL << VHOST_F_LOG_ALL))))
492 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
493 __vhost_log_cache_write_iova(dev, vq, iova, len);
495 __vhost_log_cache_write(dev, vq, iova, len);
498 static __rte_always_inline void
499 vhost_log_write_iova(struct virtio_net *dev, struct vhost_virtqueue *vq,
500 uint64_t iova, uint64_t len)
502 if (likely(!(dev->features & (1ULL << VHOST_F_LOG_ALL))))
505 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
506 __vhost_log_write_iova(dev, vq, iova, len);
508 __vhost_log_write(dev, iova, len);
511 extern int vhost_config_log_level;
512 extern int vhost_data_log_level;
514 #define VHOST_LOG_CONFIG(level, fmt, args...) \
515 rte_log(RTE_LOG_ ## level, vhost_config_log_level, \
516 "VHOST_CONFIG: " fmt, ##args)
518 #define VHOST_LOG_DATA(level, fmt, args...) \
519 (void)((RTE_LOG_ ## level <= RTE_LOG_DP_LEVEL) ? \
520 rte_log(RTE_LOG_ ## level, vhost_data_log_level, \
521 "VHOST_DATA : " fmt, ##args) : \
524 #ifdef RTE_LIBRTE_VHOST_DEBUG
525 #define VHOST_MAX_PRINT_BUFF 6072
526 #define PRINT_PACKET(device, addr, size, header) do { \
527 char *pkt_addr = (char *)(addr); \
528 unsigned int index; \
529 char packet[VHOST_MAX_PRINT_BUFF]; \
532 snprintf(packet, VHOST_MAX_PRINT_BUFF, "(%d) Header size %d: ", (device->vid), (size)); \
534 snprintf(packet, VHOST_MAX_PRINT_BUFF, "(%d) Packet size %d: ", (device->vid), (size)); \
535 for (index = 0; index < (size); index++) { \
536 snprintf(packet + strnlen(packet, VHOST_MAX_PRINT_BUFF), VHOST_MAX_PRINT_BUFF - strnlen(packet, VHOST_MAX_PRINT_BUFF), \
537 "%02hhx ", pkt_addr[index]); \
539 snprintf(packet + strnlen(packet, VHOST_MAX_PRINT_BUFF), VHOST_MAX_PRINT_BUFF - strnlen(packet, VHOST_MAX_PRINT_BUFF), "\n"); \
541 VHOST_LOG_DATA(DEBUG, "%s", packet); \
544 #define PRINT_PACKET(device, addr, size, header) do {} while (0)
547 #define MAX_VHOST_DEVICE 1024
548 extern struct virtio_net *vhost_devices[MAX_VHOST_DEVICE];
550 #define VHOST_BINARY_SEARCH_THRESH 256
552 static __rte_always_inline int guest_page_addrcmp(const void *p1,
555 const struct guest_page *page1 = (const struct guest_page *)p1;
556 const struct guest_page *page2 = (const struct guest_page *)p2;
558 if (page1->guest_phys_addr > page2->guest_phys_addr)
560 if (page1->guest_phys_addr < page2->guest_phys_addr)
566 /* Convert guest physical address to host physical address */
567 static __rte_always_inline rte_iova_t
568 gpa_to_hpa(struct virtio_net *dev, uint64_t gpa, uint64_t size)
571 struct guest_page *page;
572 struct guest_page key;
574 if (dev->nr_guest_pages >= VHOST_BINARY_SEARCH_THRESH) {
575 key.guest_phys_addr = gpa;
576 page = bsearch(&key, dev->guest_pages, dev->nr_guest_pages,
577 sizeof(struct guest_page), guest_page_addrcmp);
579 if (gpa + size < page->guest_phys_addr + page->size)
580 return gpa - page->guest_phys_addr +
581 page->host_phys_addr;
584 for (i = 0; i < dev->nr_guest_pages; i++) {
585 page = &dev->guest_pages[i];
587 if (gpa >= page->guest_phys_addr &&
588 gpa + size < page->guest_phys_addr +
590 return gpa - page->guest_phys_addr +
591 page->host_phys_addr;
598 static __rte_always_inline rte_iova_t
599 gpa_to_first_hpa(struct virtio_net *dev, uint64_t gpa,
600 uint64_t gpa_size, uint64_t *hpa_size)
603 struct guest_page *page;
604 struct guest_page key;
606 *hpa_size = gpa_size;
607 if (dev->nr_guest_pages >= VHOST_BINARY_SEARCH_THRESH) {
608 key.guest_phys_addr = gpa & ~(dev->guest_pages[0].size - 1);
609 page = bsearch(&key, dev->guest_pages, dev->nr_guest_pages,
610 sizeof(struct guest_page), guest_page_addrcmp);
612 if (gpa + gpa_size <=
613 page->guest_phys_addr + page->size) {
614 return gpa - page->guest_phys_addr +
615 page->host_phys_addr;
616 } else if (gpa < page->guest_phys_addr +
618 *hpa_size = page->guest_phys_addr +
620 return gpa - page->guest_phys_addr +
621 page->host_phys_addr;
625 for (i = 0; i < dev->nr_guest_pages; i++) {
626 page = &dev->guest_pages[i];
628 if (gpa >= page->guest_phys_addr) {
629 if (gpa + gpa_size <=
630 page->guest_phys_addr + page->size) {
631 return gpa - page->guest_phys_addr +
632 page->host_phys_addr;
633 } else if (gpa < page->guest_phys_addr +
635 *hpa_size = page->guest_phys_addr +
637 return gpa - page->guest_phys_addr +
638 page->host_phys_addr;
648 static __rte_always_inline uint64_t
649 hva_to_gpa(struct virtio_net *dev, uint64_t vva, uint64_t len)
651 struct rte_vhost_mem_region *r;
654 if (unlikely(!dev || !dev->mem))
657 for (i = 0; i < dev->mem->nregions; i++) {
658 r = &dev->mem->regions[i];
660 if (vva >= r->host_user_addr &&
661 vva + len < r->host_user_addr + r->size) {
662 return r->guest_phys_addr + vva - r->host_user_addr;
668 static __rte_always_inline struct virtio_net *
671 struct virtio_net *dev = vhost_devices[vid];
673 if (unlikely(!dev)) {
674 VHOST_LOG_CONFIG(ERR,
675 "(%d) device not found.\n", vid);
681 int vhost_new_device(void);
682 void cleanup_device(struct virtio_net *dev, int destroy);
683 void reset_device(struct virtio_net *dev);
684 void vhost_destroy_device(int);
685 void vhost_destroy_device_notify(struct virtio_net *dev);
687 void cleanup_vq(struct vhost_virtqueue *vq, int destroy);
688 void cleanup_vq_inflight(struct virtio_net *dev, struct vhost_virtqueue *vq);
689 void free_vq(struct virtio_net *dev, struct vhost_virtqueue *vq);
691 int alloc_vring_queue(struct virtio_net *dev, uint32_t vring_idx);
693 void vhost_attach_vdpa_device(int vid, struct rte_vdpa_device *dev);
695 void vhost_set_ifname(int, const char *if_name, unsigned int if_len);
696 void vhost_set_builtin_virtio_net(int vid, bool enable);
697 void vhost_enable_extbuf(int vid);
698 void vhost_enable_linearbuf(int vid);
699 int vhost_enable_guest_notification(struct virtio_net *dev,
700 struct vhost_virtqueue *vq, int enable);
702 struct vhost_device_ops const *vhost_driver_callback_get(const char *path);
705 * Backend-specific cleanup.
707 * TODO: fix it; we have one backend now
709 void vhost_backend_cleanup(struct virtio_net *dev);
711 uint64_t __vhost_iova_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
712 uint64_t iova, uint64_t *len, uint8_t perm);
713 void *vhost_alloc_copy_ind_table(struct virtio_net *dev,
714 struct vhost_virtqueue *vq,
715 uint64_t desc_addr, uint64_t desc_len);
716 int vring_translate(struct virtio_net *dev, struct vhost_virtqueue *vq);
717 uint64_t translate_log_addr(struct virtio_net *dev, struct vhost_virtqueue *vq,
719 void vring_invalidate(struct virtio_net *dev, struct vhost_virtqueue *vq);
721 static __rte_always_inline uint64_t
722 vhost_iova_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
723 uint64_t iova, uint64_t *len, uint8_t perm)
725 if (!(dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)))
726 return rte_vhost_va_from_guest_pa(dev->mem, iova, len);
728 return __vhost_iova_to_vva(dev, vq, iova, len, perm);
731 #define vhost_avail_event(vr) \
732 (*(volatile uint16_t*)&(vr)->used->ring[(vr)->size])
733 #define vhost_used_event(vr) \
734 (*(volatile uint16_t*)&(vr)->avail->ring[(vr)->size])
737 * The following is used with VIRTIO_RING_F_EVENT_IDX.
738 * Assuming a given event_idx value from the other size, if we have
739 * just incremented index from old to new_idx, should we trigger an
742 static __rte_always_inline int
743 vhost_need_event(uint16_t event_idx, uint16_t new_idx, uint16_t old)
745 return (uint16_t)(new_idx - event_idx - 1) < (uint16_t)(new_idx - old);
748 static __rte_always_inline void
749 vhost_vring_call_split(struct virtio_net *dev, struct vhost_virtqueue *vq)
751 /* Flush used->idx update before we read avail->flags. */
754 /* Don't kick guest if we don't reach index specified by guest. */
755 if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX)) {
756 uint16_t old = vq->signalled_used;
757 uint16_t new = vq->async_pkts_inflight_n ?
758 vq->used->idx:vq->last_used_idx;
759 bool signalled_used_valid = vq->signalled_used_valid;
761 vq->signalled_used = new;
762 vq->signalled_used_valid = true;
764 VHOST_LOG_DATA(DEBUG, "%s: used_event_idx=%d, old=%d, new=%d\n",
766 vhost_used_event(vq),
769 if ((vhost_need_event(vhost_used_event(vq), new, old) &&
770 (vq->callfd >= 0)) ||
771 unlikely(!signalled_used_valid)) {
772 eventfd_write(vq->callfd, (eventfd_t) 1);
773 if (dev->notify_ops->guest_notified)
774 dev->notify_ops->guest_notified(dev->vid);
777 /* Kick the guest if necessary. */
778 if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT)
779 && (vq->callfd >= 0)) {
780 eventfd_write(vq->callfd, (eventfd_t)1);
781 if (dev->notify_ops->guest_notified)
782 dev->notify_ops->guest_notified(dev->vid);
787 static __rte_always_inline void
788 vhost_vring_call_packed(struct virtio_net *dev, struct vhost_virtqueue *vq)
790 uint16_t old, new, off, off_wrap;
791 bool signalled_used_valid, kick = false;
793 /* Flush used desc update. */
796 if (!(dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))) {
797 if (vq->driver_event->flags !=
798 VRING_EVENT_F_DISABLE)
803 old = vq->signalled_used;
804 new = vq->last_used_idx;
805 vq->signalled_used = new;
806 signalled_used_valid = vq->signalled_used_valid;
807 vq->signalled_used_valid = true;
809 if (vq->driver_event->flags != VRING_EVENT_F_DESC) {
810 if (vq->driver_event->flags != VRING_EVENT_F_DISABLE)
815 if (unlikely(!signalled_used_valid)) {
822 off_wrap = vq->driver_event->off_wrap;
823 off = off_wrap & ~(1 << 15);
828 if (vq->used_wrap_counter != off_wrap >> 15)
831 if (vhost_need_event(off, new, old))
835 eventfd_write(vq->callfd, (eventfd_t)1);
836 if (dev->notify_ops->guest_notified)
837 dev->notify_ops->guest_notified(dev->vid);
841 static __rte_always_inline void
842 free_ind_table(void *idesc)
847 static __rte_always_inline void
848 restore_mbuf(struct rte_mbuf *m)
850 uint32_t mbuf_size, priv_size;
853 priv_size = rte_pktmbuf_priv_size(m->pool);
854 mbuf_size = sizeof(struct rte_mbuf) + priv_size;
855 /* start of buffer is after mbuf structure and priv data */
857 m->buf_addr = (char *)m + mbuf_size;
858 m->buf_iova = rte_mempool_virt2iova(m) + mbuf_size;
863 static __rte_always_inline bool
864 mbuf_is_consumed(struct rte_mbuf *m)
867 if (rte_mbuf_refcnt_read(m) > 1)
875 #endif /* _VHOST_NET_CDEV_H_ */