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 ((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 * 2)
52 #define VHOST_MAX_ASYNC_VEC (BUF_VECTOR_MAX * 4)
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 * Structure contains variables relevant to RX/TX virtqueues.
125 struct vhost_virtqueue {
127 struct vring_desc *desc;
128 struct vring_packed_desc *desc_packed;
131 struct vring_avail *avail;
132 struct vring_packed_desc_event *driver_event;
135 struct vring_used *used;
136 struct vring_packed_desc_event *device_event;
140 uint16_t last_avail_idx;
141 uint16_t last_used_idx;
142 /* Last used index we notify to front end. */
143 uint16_t signalled_used;
144 bool signalled_used_valid;
145 #define VIRTIO_INVALID_EVENTFD (-1)
146 #define VIRTIO_UNINITIALIZED_EVENTFD (-2)
152 rte_spinlock_t access_lock;
156 struct vring_used_elem *shadow_used_split;
157 struct vring_used_elem_packed *shadow_used_packed;
159 uint16_t shadow_used_idx;
160 /* Record packed ring enqueue latest desc cache aligned index */
161 uint16_t shadow_aligned_idx;
162 /* Record packed ring first dequeue desc index */
163 uint16_t shadow_last_used_idx;
165 uint16_t batch_copy_nb_elems;
166 struct batch_copy_elem *batch_copy_elems;
168 bool used_wrap_counter;
169 bool avail_wrap_counter;
171 /* Physical address of used ring, for logging */
172 uint16_t log_cache_nb_elem;
173 uint64_t log_guest_addr;
174 struct log_cache_entry *log_cache;
176 rte_rwlock_t iotlb_lock;
177 rte_rwlock_t iotlb_pending_lock;
178 struct rte_mempool *iotlb_pool;
179 TAILQ_HEAD(, vhost_iotlb_entry) iotlb_list;
180 TAILQ_HEAD(, vhost_iotlb_entry) iotlb_pending_list;
183 /* Used to notify the guest (trigger interrupt) */
185 /* Currently unused as polling mode is enabled */
188 /* inflight share memory info */
190 struct rte_vhost_inflight_info_split *inflight_split;
191 struct rte_vhost_inflight_info_packed *inflight_packed;
193 struct rte_vhost_resubmit_info *resubmit_inflight;
194 uint64_t global_counter;
196 /* operation callbacks for async dma */
197 struct rte_vhost_async_channel_ops async_ops;
199 struct rte_vhost_iov_iter *it_pool;
200 struct iovec *vec_pool;
202 /* async data transfer status */
203 struct async_inflight_info *async_pkts_info;
204 uint16_t async_pkts_idx;
205 uint16_t async_pkts_inflight_n;
206 uint16_t async_last_pkts_n;
208 struct vring_used_elem *async_descs_split;
209 struct vring_used_elem_packed *async_buffers_packed;
212 uint16_t async_desc_idx_split;
213 uint16_t async_buffer_idx_packed;
216 uint16_t last_async_desc_idx_split;
217 uint16_t last_async_buffer_idx_packed;
220 /* vq async features */
222 bool async_registered;
223 uint16_t async_threshold;
226 #define VIRTIO_UNINITIALIZED_NOTIF (-1)
228 struct vhost_vring_addr ring_addrs;
229 } __rte_cache_aligned;
231 /* Virtio device status as per Virtio specification */
232 #define VIRTIO_DEVICE_STATUS_RESET 0x00
233 #define VIRTIO_DEVICE_STATUS_ACK 0x01
234 #define VIRTIO_DEVICE_STATUS_DRIVER 0x02
235 #define VIRTIO_DEVICE_STATUS_DRIVER_OK 0x04
236 #define VIRTIO_DEVICE_STATUS_FEATURES_OK 0x08
237 #define VIRTIO_DEVICE_STATUS_DEV_NEED_RESET 0x40
238 #define VIRTIO_DEVICE_STATUS_FAILED 0x80
240 #define VHOST_MAX_VRING 0x100
241 #define VHOST_MAX_QUEUE_PAIRS 0x80
243 /* Declare IOMMU related bits for older kernels */
244 #ifndef VIRTIO_F_IOMMU_PLATFORM
246 #define VIRTIO_F_IOMMU_PLATFORM 33
248 struct vhost_iotlb_msg {
252 #define VHOST_ACCESS_RO 0x1
253 #define VHOST_ACCESS_WO 0x2
254 #define VHOST_ACCESS_RW 0x3
256 #define VHOST_IOTLB_MISS 1
257 #define VHOST_IOTLB_UPDATE 2
258 #define VHOST_IOTLB_INVALIDATE 3
259 #define VHOST_IOTLB_ACCESS_FAIL 4
263 #define VHOST_IOTLB_MSG 0x1
268 struct vhost_iotlb_msg iotlb;
275 * Define virtio 1.0 for older kernels
277 #ifndef VIRTIO_F_VERSION_1
278 #define VIRTIO_F_VERSION_1 32
281 /* Declare packed ring related bits for older kernels */
282 #ifndef VIRTIO_F_RING_PACKED
284 #define VIRTIO_F_RING_PACKED 34
286 struct vring_packed_desc {
293 struct vring_packed_desc_event {
300 * Declare below packed ring defines unconditionally
301 * as Kernel header might use different names.
303 #define VRING_DESC_F_AVAIL (1ULL << 7)
304 #define VRING_DESC_F_USED (1ULL << 15)
306 #define VRING_EVENT_F_ENABLE 0x0
307 #define VRING_EVENT_F_DISABLE 0x1
308 #define VRING_EVENT_F_DESC 0x2
311 * Available and used descs are in same order
313 #ifndef VIRTIO_F_IN_ORDER
314 #define VIRTIO_F_IN_ORDER 35
317 /* Features supported by this builtin vhost-user net driver. */
318 #define VIRTIO_NET_SUPPORTED_FEATURES ((1ULL << VIRTIO_NET_F_MRG_RXBUF) | \
319 (1ULL << VIRTIO_F_ANY_LAYOUT) | \
320 (1ULL << VIRTIO_NET_F_CTRL_VQ) | \
321 (1ULL << VIRTIO_NET_F_CTRL_RX) | \
322 (1ULL << VIRTIO_NET_F_GUEST_ANNOUNCE) | \
323 (1ULL << VIRTIO_NET_F_MQ) | \
324 (1ULL << VIRTIO_F_VERSION_1) | \
325 (1ULL << VHOST_F_LOG_ALL) | \
326 (1ULL << VHOST_USER_F_PROTOCOL_FEATURES) | \
327 (1ULL << VIRTIO_NET_F_GSO) | \
328 (1ULL << VIRTIO_NET_F_HOST_TSO4) | \
329 (1ULL << VIRTIO_NET_F_HOST_TSO6) | \
330 (1ULL << VIRTIO_NET_F_HOST_UFO) | \
331 (1ULL << VIRTIO_NET_F_HOST_ECN) | \
332 (1ULL << VIRTIO_NET_F_CSUM) | \
333 (1ULL << VIRTIO_NET_F_GUEST_CSUM) | \
334 (1ULL << VIRTIO_NET_F_GUEST_TSO4) | \
335 (1ULL << VIRTIO_NET_F_GUEST_TSO6) | \
336 (1ULL << VIRTIO_NET_F_GUEST_UFO) | \
337 (1ULL << VIRTIO_NET_F_GUEST_ECN) | \
338 (1ULL << VIRTIO_RING_F_INDIRECT_DESC) | \
339 (1ULL << VIRTIO_RING_F_EVENT_IDX) | \
340 (1ULL << VIRTIO_NET_F_MTU) | \
341 (1ULL << VIRTIO_F_IN_ORDER) | \
342 (1ULL << VIRTIO_F_IOMMU_PLATFORM) | \
343 (1ULL << VIRTIO_F_RING_PACKED))
347 uint64_t guest_phys_addr;
348 uint64_t host_phys_addr;
352 struct inflight_mem_info {
359 * Device structure contains all configuration information relating
363 /* Frontend (QEMU) memory and memory region information */
364 struct rte_vhost_memory *mem;
366 uint64_t protocol_features;
370 /* to tell if we need broadcast rarp packet */
371 int16_t broadcast_rarp;
376 struct vhost_virtqueue *virtqueue[VHOST_MAX_QUEUE_PAIRS * 2];
377 struct inflight_mem_info *inflight_info;
378 #define IF_NAME_SZ (PATH_MAX > IFNAMSIZ ? PATH_MAX : IFNAMSIZ)
379 char ifname[IF_NAME_SZ];
383 struct rte_ether_addr mac;
387 struct vhost_device_ops const *notify_ops;
389 uint32_t nr_guest_pages;
390 uint32_t max_guest_pages;
391 struct guest_page *guest_pages;
394 rte_spinlock_t slave_req_lock;
397 int postcopy_listening;
399 struct rte_vdpa_device *vdpa_dev;
401 /* context data for the external message handlers */
403 /* pre and post vhost user message handlers for the device */
404 struct rte_vhost_user_extern_ops extern_ops;
405 } __rte_cache_aligned;
407 static __rte_always_inline bool
408 vq_is_packed(struct virtio_net *dev)
410 return dev->features & (1ull << VIRTIO_F_RING_PACKED);
414 desc_is_avail(struct vring_packed_desc *desc, bool wrap_counter)
416 uint16_t flags = __atomic_load_n(&desc->flags, __ATOMIC_ACQUIRE);
418 return wrap_counter == !!(flags & VRING_DESC_F_AVAIL) &&
419 wrap_counter != !!(flags & VRING_DESC_F_USED);
423 vq_inc_last_used_packed(struct vhost_virtqueue *vq, uint16_t num)
425 vq->last_used_idx += num;
426 if (vq->last_used_idx >= vq->size) {
427 vq->used_wrap_counter ^= 1;
428 vq->last_used_idx -= vq->size;
433 vq_inc_last_avail_packed(struct vhost_virtqueue *vq, uint16_t num)
435 vq->last_avail_idx += num;
436 if (vq->last_avail_idx >= vq->size) {
437 vq->avail_wrap_counter ^= 1;
438 vq->last_avail_idx -= vq->size;
442 void __vhost_log_cache_write(struct virtio_net *dev,
443 struct vhost_virtqueue *vq,
444 uint64_t addr, uint64_t len);
445 void __vhost_log_cache_write_iova(struct virtio_net *dev,
446 struct vhost_virtqueue *vq,
447 uint64_t iova, uint64_t len);
448 void __vhost_log_cache_sync(struct virtio_net *dev,
449 struct vhost_virtqueue *vq);
450 void __vhost_log_write(struct virtio_net *dev, uint64_t addr, uint64_t len);
451 void __vhost_log_write_iova(struct virtio_net *dev, struct vhost_virtqueue *vq,
452 uint64_t iova, uint64_t len);
454 static __rte_always_inline void
455 vhost_log_write(struct virtio_net *dev, uint64_t addr, uint64_t len)
457 if (unlikely(dev->features & (1ULL << VHOST_F_LOG_ALL)))
458 __vhost_log_write(dev, addr, len);
461 static __rte_always_inline void
462 vhost_log_cache_sync(struct virtio_net *dev, struct vhost_virtqueue *vq)
464 if (unlikely(dev->features & (1ULL << VHOST_F_LOG_ALL)))
465 __vhost_log_cache_sync(dev, vq);
468 static __rte_always_inline void
469 vhost_log_cache_write(struct virtio_net *dev, struct vhost_virtqueue *vq,
470 uint64_t addr, uint64_t len)
472 if (unlikely(dev->features & (1ULL << VHOST_F_LOG_ALL)))
473 __vhost_log_cache_write(dev, vq, addr, len);
476 static __rte_always_inline void
477 vhost_log_cache_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_cache_write(dev, vq, vq->log_guest_addr + offset,
488 static __rte_always_inline void
489 vhost_log_used_vring(struct virtio_net *dev, struct vhost_virtqueue *vq,
490 uint64_t offset, uint64_t len)
492 if (unlikely(dev->features & (1ULL << VHOST_F_LOG_ALL))) {
493 if (unlikely(vq->log_guest_addr == 0))
495 __vhost_log_write(dev, vq->log_guest_addr + offset, len);
499 static __rte_always_inline void
500 vhost_log_cache_write_iova(struct virtio_net *dev, struct vhost_virtqueue *vq,
501 uint64_t iova, uint64_t len)
503 if (likely(!(dev->features & (1ULL << VHOST_F_LOG_ALL))))
506 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
507 __vhost_log_cache_write_iova(dev, vq, iova, len);
509 __vhost_log_cache_write(dev, vq, iova, len);
512 static __rte_always_inline void
513 vhost_log_write_iova(struct virtio_net *dev, struct vhost_virtqueue *vq,
514 uint64_t iova, uint64_t len)
516 if (likely(!(dev->features & (1ULL << VHOST_F_LOG_ALL))))
519 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
520 __vhost_log_write_iova(dev, vq, iova, len);
522 __vhost_log_write(dev, iova, len);
525 extern int vhost_config_log_level;
526 extern int vhost_data_log_level;
528 #define VHOST_LOG_CONFIG(level, fmt, args...) \
529 rte_log(RTE_LOG_ ## level, vhost_config_log_level, \
530 "VHOST_CONFIG: " fmt, ##args)
532 #define VHOST_LOG_DATA(level, fmt, args...) \
533 (void)((RTE_LOG_ ## level <= RTE_LOG_DP_LEVEL) ? \
534 rte_log(RTE_LOG_ ## level, vhost_data_log_level, \
535 "VHOST_DATA : " fmt, ##args) : \
538 #ifdef RTE_LIBRTE_VHOST_DEBUG
539 #define VHOST_MAX_PRINT_BUFF 6072
540 #define PRINT_PACKET(device, addr, size, header) do { \
541 char *pkt_addr = (char *)(addr); \
542 unsigned int index; \
543 char packet[VHOST_MAX_PRINT_BUFF]; \
546 snprintf(packet, VHOST_MAX_PRINT_BUFF, "(%d) Header size %d: ", (device->vid), (size)); \
548 snprintf(packet, VHOST_MAX_PRINT_BUFF, "(%d) Packet size %d: ", (device->vid), (size)); \
549 for (index = 0; index < (size); index++) { \
550 snprintf(packet + strnlen(packet, VHOST_MAX_PRINT_BUFF), VHOST_MAX_PRINT_BUFF - strnlen(packet, VHOST_MAX_PRINT_BUFF), \
551 "%02hhx ", pkt_addr[index]); \
553 snprintf(packet + strnlen(packet, VHOST_MAX_PRINT_BUFF), VHOST_MAX_PRINT_BUFF - strnlen(packet, VHOST_MAX_PRINT_BUFF), "\n"); \
555 VHOST_LOG_DATA(DEBUG, "%s", packet); \
558 #define PRINT_PACKET(device, addr, size, header) do {} while (0)
561 #define MAX_VHOST_DEVICE 1024
562 extern struct virtio_net *vhost_devices[MAX_VHOST_DEVICE];
564 #define VHOST_BINARY_SEARCH_THRESH 256
566 static __rte_always_inline int guest_page_addrcmp(const void *p1,
569 const struct guest_page *page1 = (const struct guest_page *)p1;
570 const struct guest_page *page2 = (const struct guest_page *)p2;
572 if (page1->guest_phys_addr > page2->guest_phys_addr)
574 if (page1->guest_phys_addr < page2->guest_phys_addr)
580 static __rte_always_inline rte_iova_t
581 gpa_to_first_hpa(struct virtio_net *dev, uint64_t gpa,
582 uint64_t gpa_size, uint64_t *hpa_size)
585 struct guest_page *page;
586 struct guest_page key;
588 *hpa_size = gpa_size;
589 if (dev->nr_guest_pages >= VHOST_BINARY_SEARCH_THRESH) {
590 key.guest_phys_addr = gpa & ~(dev->guest_pages[0].size - 1);
591 page = bsearch(&key, dev->guest_pages, dev->nr_guest_pages,
592 sizeof(struct guest_page), guest_page_addrcmp);
594 if (gpa + gpa_size <=
595 page->guest_phys_addr + page->size) {
596 return gpa - page->guest_phys_addr +
597 page->host_phys_addr;
598 } else if (gpa < page->guest_phys_addr +
600 *hpa_size = page->guest_phys_addr +
602 return gpa - page->guest_phys_addr +
603 page->host_phys_addr;
607 for (i = 0; i < dev->nr_guest_pages; i++) {
608 page = &dev->guest_pages[i];
610 if (gpa >= page->guest_phys_addr) {
611 if (gpa + gpa_size <=
612 page->guest_phys_addr + page->size) {
613 return gpa - page->guest_phys_addr +
614 page->host_phys_addr;
615 } else if (gpa < page->guest_phys_addr +
617 *hpa_size = page->guest_phys_addr +
619 return gpa - page->guest_phys_addr +
620 page->host_phys_addr;
630 /* Convert guest physical address to host physical address */
631 static __rte_always_inline rte_iova_t
632 gpa_to_hpa(struct virtio_net *dev, uint64_t gpa, uint64_t size)
637 hpa = gpa_to_first_hpa(dev, gpa, size, &hpa_size);
638 return hpa_size == size ? hpa : 0;
641 static __rte_always_inline uint64_t
642 hva_to_gpa(struct virtio_net *dev, uint64_t vva, uint64_t len)
644 struct rte_vhost_mem_region *r;
647 if (unlikely(!dev || !dev->mem))
650 for (i = 0; i < dev->mem->nregions; i++) {
651 r = &dev->mem->regions[i];
653 if (vva >= r->host_user_addr &&
654 vva + len < r->host_user_addr + r->size) {
655 return r->guest_phys_addr + vva - r->host_user_addr;
661 static __rte_always_inline struct virtio_net *
664 struct virtio_net *dev = vhost_devices[vid];
666 if (unlikely(!dev)) {
667 VHOST_LOG_CONFIG(ERR,
668 "(%d) device not found.\n", vid);
674 int vhost_new_device(void);
675 void cleanup_device(struct virtio_net *dev, int destroy);
676 void reset_device(struct virtio_net *dev);
677 void vhost_destroy_device(int);
678 void vhost_destroy_device_notify(struct virtio_net *dev);
680 void cleanup_vq(struct vhost_virtqueue *vq, int destroy);
681 void cleanup_vq_inflight(struct virtio_net *dev, struct vhost_virtqueue *vq);
682 void free_vq(struct virtio_net *dev, struct vhost_virtqueue *vq);
684 int alloc_vring_queue(struct virtio_net *dev, uint32_t vring_idx);
686 void vhost_attach_vdpa_device(int vid, struct rte_vdpa_device *dev);
688 void vhost_set_ifname(int, const char *if_name, unsigned int if_len);
689 void vhost_setup_virtio_net(int vid, bool enable, bool legacy_ol_flags);
690 void vhost_enable_extbuf(int vid);
691 void vhost_enable_linearbuf(int vid);
692 int vhost_enable_guest_notification(struct virtio_net *dev,
693 struct vhost_virtqueue *vq, int enable);
695 struct vhost_device_ops const *vhost_driver_callback_get(const char *path);
698 * Backend-specific cleanup.
700 * TODO: fix it; we have one backend now
702 void vhost_backend_cleanup(struct virtio_net *dev);
704 uint64_t __vhost_iova_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
705 uint64_t iova, uint64_t *len, uint8_t perm);
706 void *vhost_alloc_copy_ind_table(struct virtio_net *dev,
707 struct vhost_virtqueue *vq,
708 uint64_t desc_addr, uint64_t desc_len);
709 int vring_translate(struct virtio_net *dev, struct vhost_virtqueue *vq);
710 uint64_t translate_log_addr(struct virtio_net *dev, struct vhost_virtqueue *vq,
712 void vring_invalidate(struct virtio_net *dev, struct vhost_virtqueue *vq);
714 static __rte_always_inline uint64_t
715 vhost_iova_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
716 uint64_t iova, uint64_t *len, uint8_t perm)
718 if (!(dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)))
719 return rte_vhost_va_from_guest_pa(dev->mem, iova, len);
721 return __vhost_iova_to_vva(dev, vq, iova, len, perm);
724 #define vhost_avail_event(vr) \
725 (*(volatile uint16_t*)&(vr)->used->ring[(vr)->size])
726 #define vhost_used_event(vr) \
727 (*(volatile uint16_t*)&(vr)->avail->ring[(vr)->size])
730 * The following is used with VIRTIO_RING_F_EVENT_IDX.
731 * Assuming a given event_idx value from the other size, if we have
732 * just incremented index from old to new_idx, should we trigger an
735 static __rte_always_inline int
736 vhost_need_event(uint16_t event_idx, uint16_t new_idx, uint16_t old)
738 return (uint16_t)(new_idx - event_idx - 1) < (uint16_t)(new_idx - old);
741 static __rte_always_inline void
742 vhost_vring_call_split(struct virtio_net *dev, struct vhost_virtqueue *vq)
744 /* Flush used->idx update before we read avail->flags. */
745 rte_atomic_thread_fence(__ATOMIC_SEQ_CST);
747 /* Don't kick guest if we don't reach index specified by guest. */
748 if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX)) {
749 uint16_t old = vq->signalled_used;
750 uint16_t new = vq->last_used_idx;
751 bool signalled_used_valid = vq->signalled_used_valid;
753 vq->signalled_used = new;
754 vq->signalled_used_valid = true;
756 VHOST_LOG_DATA(DEBUG, "%s: used_event_idx=%d, old=%d, new=%d\n",
758 vhost_used_event(vq),
761 if ((vhost_need_event(vhost_used_event(vq), new, old) &&
762 (vq->callfd >= 0)) ||
763 unlikely(!signalled_used_valid)) {
764 eventfd_write(vq->callfd, (eventfd_t) 1);
765 if (dev->notify_ops->guest_notified)
766 dev->notify_ops->guest_notified(dev->vid);
769 /* Kick the guest if necessary. */
770 if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT)
771 && (vq->callfd >= 0)) {
772 eventfd_write(vq->callfd, (eventfd_t)1);
773 if (dev->notify_ops->guest_notified)
774 dev->notify_ops->guest_notified(dev->vid);
779 static __rte_always_inline void
780 vhost_vring_call_packed(struct virtio_net *dev, struct vhost_virtqueue *vq)
782 uint16_t old, new, off, off_wrap;
783 bool signalled_used_valid, kick = false;
785 /* Flush used desc update. */
786 rte_atomic_thread_fence(__ATOMIC_SEQ_CST);
788 if (!(dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))) {
789 if (vq->driver_event->flags !=
790 VRING_EVENT_F_DISABLE)
795 old = vq->signalled_used;
796 new = vq->last_used_idx;
797 vq->signalled_used = new;
798 signalled_used_valid = vq->signalled_used_valid;
799 vq->signalled_used_valid = true;
801 if (vq->driver_event->flags != VRING_EVENT_F_DESC) {
802 if (vq->driver_event->flags != VRING_EVENT_F_DISABLE)
807 if (unlikely(!signalled_used_valid)) {
812 rte_atomic_thread_fence(__ATOMIC_ACQUIRE);
814 off_wrap = vq->driver_event->off_wrap;
815 off = off_wrap & ~(1 << 15);
820 if (vq->used_wrap_counter != off_wrap >> 15)
823 if (vhost_need_event(off, new, old))
827 eventfd_write(vq->callfd, (eventfd_t)1);
828 if (dev->notify_ops->guest_notified)
829 dev->notify_ops->guest_notified(dev->vid);
833 static __rte_always_inline void
834 free_ind_table(void *idesc)
839 static __rte_always_inline void
840 restore_mbuf(struct rte_mbuf *m)
842 uint32_t mbuf_size, priv_size;
845 priv_size = rte_pktmbuf_priv_size(m->pool);
846 mbuf_size = sizeof(struct rte_mbuf) + priv_size;
847 /* start of buffer is after mbuf structure and priv data */
849 m->buf_addr = (char *)m + mbuf_size;
850 m->buf_iova = rte_mempool_virt2iova(m) + mbuf_size;
855 static __rte_always_inline bool
856 mbuf_is_consumed(struct rte_mbuf *m)
859 if (rte_mbuf_refcnt_read(m) > 1)
867 #endif /* _VHOST_NET_CDEV_H_ */