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"
26 /* Used to indicate that the device is running on a data core */
27 #define VIRTIO_DEV_RUNNING 1
28 /* Used to indicate that the device is ready to operate */
29 #define VIRTIO_DEV_READY 2
30 /* Used to indicate that the built-in vhost net device backend is enabled */
31 #define VIRTIO_DEV_BUILTIN_VIRTIO_NET 4
32 /* Used to indicate that the device has its own data path and configured */
33 #define VIRTIO_DEV_VDPA_CONFIGURED 8
35 /* Backend value set by guest. */
36 #define VIRTIO_DEV_STOPPED -1
38 #define BUF_VECTOR_MAX 256
40 #define VHOST_LOG_CACHE_NR 32
43 * Structure contains buffer address, length and descriptor index
44 * from vring to do scatter RX.
54 * A structure to hold some fields needed in zero copy code path,
55 * mainly for associating an mbuf with the right desc_idx.
58 struct rte_mbuf *mbuf;
63 TAILQ_ENTRY(zcopy_mbuf) next;
65 TAILQ_HEAD(zcopy_mbuf_list, zcopy_mbuf);
68 * Structure contains the info for each batched memory copy.
70 struct batch_copy_elem {
78 * Structure that contains the info for batched dirty logging.
80 struct log_cache_entry {
85 struct vring_used_elem_packed {
92 * Structure contains variables relevant to RX/TX virtqueues.
94 struct vhost_virtqueue {
96 struct vring_desc *desc;
97 struct vring_packed_desc *desc_packed;
100 struct vring_avail *avail;
101 struct vring_packed_desc_event *driver_event;
104 struct vring_used *used;
105 struct vring_packed_desc_event *device_event;
109 uint16_t last_avail_idx;
110 uint16_t last_used_idx;
111 /* Last used index we notify to front end. */
112 uint16_t signalled_used;
113 bool signalled_used_valid;
114 #define VIRTIO_INVALID_EVENTFD (-1)
115 #define VIRTIO_UNINITIALIZED_EVENTFD (-2)
117 /* Backend value to determine if device should started/stopped */
121 rte_spinlock_t access_lock;
123 /* Used to notify the guest (trigger interrupt) */
125 /* Currently unused as polling mode is enabled */
128 /* Physical address of used ring, for logging */
129 uint64_t log_guest_addr;
133 uint16_t last_zmbuf_idx;
134 struct zcopy_mbuf *zmbufs;
135 struct zcopy_mbuf_list zmbuf_list;
138 struct vring_used_elem *shadow_used_split;
139 struct vring_used_elem_packed *shadow_used_packed;
141 uint16_t shadow_used_idx;
142 struct vhost_vring_addr ring_addrs;
144 struct batch_copy_elem *batch_copy_elems;
145 uint16_t batch_copy_nb_elems;
146 bool used_wrap_counter;
147 bool avail_wrap_counter;
149 struct log_cache_entry log_cache[VHOST_LOG_CACHE_NR];
150 uint16_t log_cache_nb_elem;
152 rte_rwlock_t iotlb_lock;
153 rte_rwlock_t iotlb_pending_lock;
154 struct rte_mempool *iotlb_pool;
155 TAILQ_HEAD(, vhost_iotlb_entry) iotlb_list;
157 TAILQ_HEAD(, vhost_iotlb_entry) iotlb_pending_list;
158 } __rte_cache_aligned;
160 /* Old kernels have no such macros defined */
161 #ifndef VIRTIO_NET_F_GUEST_ANNOUNCE
162 #define VIRTIO_NET_F_GUEST_ANNOUNCE 21
165 #ifndef VIRTIO_NET_F_MQ
166 #define VIRTIO_NET_F_MQ 22
169 #define VHOST_MAX_VRING 0x100
170 #define VHOST_MAX_QUEUE_PAIRS 0x80
172 #ifndef VIRTIO_NET_F_MTU
173 #define VIRTIO_NET_F_MTU 3
176 #ifndef VIRTIO_F_ANY_LAYOUT
177 #define VIRTIO_F_ANY_LAYOUT 27
180 /* Declare IOMMU related bits for older kernels */
181 #ifndef VIRTIO_F_IOMMU_PLATFORM
183 #define VIRTIO_F_IOMMU_PLATFORM 33
185 struct vhost_iotlb_msg {
189 #define VHOST_ACCESS_RO 0x1
190 #define VHOST_ACCESS_WO 0x2
191 #define VHOST_ACCESS_RW 0x3
193 #define VHOST_IOTLB_MISS 1
194 #define VHOST_IOTLB_UPDATE 2
195 #define VHOST_IOTLB_INVALIDATE 3
196 #define VHOST_IOTLB_ACCESS_FAIL 4
200 #define VHOST_IOTLB_MSG 0x1
205 struct vhost_iotlb_msg iotlb;
212 * Define virtio 1.0 for older kernels
214 #ifndef VIRTIO_F_VERSION_1
215 #define VIRTIO_F_VERSION_1 32
218 /* Declare packed ring related bits for older kernels */
219 #ifndef VIRTIO_F_RING_PACKED
221 #define VIRTIO_F_RING_PACKED 34
223 struct vring_packed_desc {
230 struct vring_packed_desc_event {
237 * Declare below packed ring defines unconditionally
238 * as Kernel header might use different names.
240 #define VRING_DESC_F_AVAIL (1ULL << 7)
241 #define VRING_DESC_F_USED (1ULL << 15)
243 #define VRING_EVENT_F_ENABLE 0x0
244 #define VRING_EVENT_F_DISABLE 0x1
245 #define VRING_EVENT_F_DESC 0x2
248 * Available and used descs are in same order
250 #ifndef VIRTIO_F_IN_ORDER
251 #define VIRTIO_F_IN_ORDER 35
254 /* Features supported by this builtin vhost-user net driver. */
255 #define VIRTIO_NET_SUPPORTED_FEATURES ((1ULL << VIRTIO_NET_F_MRG_RXBUF) | \
256 (1ULL << VIRTIO_F_ANY_LAYOUT) | \
257 (1ULL << VIRTIO_NET_F_CTRL_VQ) | \
258 (1ULL << VIRTIO_NET_F_CTRL_RX) | \
259 (1ULL << VIRTIO_NET_F_GUEST_ANNOUNCE) | \
260 (1ULL << VIRTIO_NET_F_MQ) | \
261 (1ULL << VIRTIO_F_VERSION_1) | \
262 (1ULL << VHOST_F_LOG_ALL) | \
263 (1ULL << VHOST_USER_F_PROTOCOL_FEATURES) | \
264 (1ULL << VIRTIO_NET_F_GSO) | \
265 (1ULL << VIRTIO_NET_F_HOST_TSO4) | \
266 (1ULL << VIRTIO_NET_F_HOST_TSO6) | \
267 (1ULL << VIRTIO_NET_F_HOST_UFO) | \
268 (1ULL << VIRTIO_NET_F_HOST_ECN) | \
269 (1ULL << VIRTIO_NET_F_CSUM) | \
270 (1ULL << VIRTIO_NET_F_GUEST_CSUM) | \
271 (1ULL << VIRTIO_NET_F_GUEST_TSO4) | \
272 (1ULL << VIRTIO_NET_F_GUEST_TSO6) | \
273 (1ULL << VIRTIO_NET_F_GUEST_UFO) | \
274 (1ULL << VIRTIO_NET_F_GUEST_ECN) | \
275 (1ULL << VIRTIO_RING_F_INDIRECT_DESC) | \
276 (1ULL << VIRTIO_RING_F_EVENT_IDX) | \
277 (1ULL << VIRTIO_NET_F_MTU) | \
278 (1ULL << VIRTIO_F_IN_ORDER) | \
279 (1ULL << VIRTIO_F_IOMMU_PLATFORM) | \
280 (1ULL << VIRTIO_F_RING_PACKED))
284 uint64_t guest_phys_addr;
285 uint64_t host_phys_addr;
289 /* The possible results of a message handling function */
291 /* Message handling failed */
293 /* Message handling successful */
295 /* Message handling successful and reply prepared */
300 * function prototype for the vhost backend to handler specific vhost user
301 * messages prior to the master message handling
308 * If the handler requires skipping the master message handling, this variable
309 * shall be written 1, otherwise 0.
311 * VH_RESULT_OK on success, VH_RESULT_REPLY on success with reply,
312 * VH_RESULT_ERR on failure
314 typedef enum vh_result (*vhost_msg_pre_handle)(int vid, void *msg,
315 uint32_t *skip_master);
318 * function prototype for the vhost backend to handler specific vhost user
319 * messages after the master message handling is done
326 * VH_RESULT_OK on success, VH_RESULT_REPLY on success with reply,
327 * VH_RESULT_ERR on failure
329 typedef enum vh_result (*vhost_msg_post_handle)(int vid, void *msg);
332 * pre and post vhost user message handlers
334 struct vhost_user_extern_ops {
335 vhost_msg_pre_handle pre_msg_handle;
336 vhost_msg_post_handle post_msg_handle;
340 * Device structure contains all configuration information relating
344 /* Frontend (QEMU) memory and memory region information */
345 struct rte_vhost_memory *mem;
347 uint64_t protocol_features;
351 /* to tell if we need broadcast rarp packet */
352 rte_atomic16_t broadcast_rarp;
354 int dequeue_zero_copy;
355 struct vhost_virtqueue *virtqueue[VHOST_MAX_QUEUE_PAIRS * 2];
356 #define IF_NAME_SZ (PATH_MAX > IFNAMSIZ ? PATH_MAX : IFNAMSIZ)
357 char ifname[IF_NAME_SZ];
361 struct ether_addr mac;
364 struct vhost_device_ops const *notify_ops;
366 uint32_t nr_guest_pages;
367 uint32_t max_guest_pages;
368 struct guest_page *guest_pages;
371 rte_spinlock_t slave_req_lock;
374 int postcopy_listening;
377 * Device id to identify a specific backend device.
378 * It's set to -1 for the default software implementation.
382 /* private data for virtio device */
384 /* pre and post vhost user message handlers for the device */
385 struct vhost_user_extern_ops extern_ops;
386 } __rte_cache_aligned;
388 static __rte_always_inline bool
389 vq_is_packed(struct virtio_net *dev)
391 return dev->features & (1ull << VIRTIO_F_RING_PACKED);
395 desc_is_avail(struct vring_packed_desc *desc, bool wrap_counter)
397 uint16_t flags = *((volatile uint16_t *) &desc->flags);
399 return wrap_counter == !!(flags & VRING_DESC_F_AVAIL) &&
400 wrap_counter != !!(flags & VRING_DESC_F_USED);
403 #define VHOST_LOG_PAGE 4096
406 * Atomically set a bit in memory.
408 static __rte_always_inline void
409 vhost_set_bit(unsigned int nr, volatile uint8_t *addr)
411 #if defined(RTE_TOOLCHAIN_GCC) && (GCC_VERSION < 70100)
413 * __sync_ built-ins are deprecated, but __atomic_ ones
414 * are sub-optimized in older GCC versions.
416 __sync_fetch_and_or_1(addr, (1U << nr));
418 __atomic_fetch_or(addr, (1U << nr), __ATOMIC_RELAXED);
422 static __rte_always_inline void
423 vhost_log_page(uint8_t *log_base, uint64_t page)
425 vhost_set_bit(page % 8, &log_base[page / 8]);
428 static __rte_always_inline void
429 vhost_log_write(struct virtio_net *dev, uint64_t addr, uint64_t len)
433 if (likely(((dev->features & (1ULL << VHOST_F_LOG_ALL)) == 0) ||
434 !dev->log_base || !len))
437 if (unlikely(dev->log_size <= ((addr + len - 1) / VHOST_LOG_PAGE / 8)))
440 /* To make sure guest memory updates are committed before logging */
443 page = addr / VHOST_LOG_PAGE;
444 while (page * VHOST_LOG_PAGE < addr + len) {
445 vhost_log_page((uint8_t *)(uintptr_t)dev->log_base, page);
450 static __rte_always_inline void
451 vhost_log_cache_sync(struct virtio_net *dev, struct vhost_virtqueue *vq)
453 unsigned long *log_base;
456 if (likely(((dev->features & (1ULL << VHOST_F_LOG_ALL)) == 0) ||
462 log_base = (unsigned long *)(uintptr_t)dev->log_base;
464 for (i = 0; i < vq->log_cache_nb_elem; i++) {
465 struct log_cache_entry *elem = vq->log_cache + i;
467 #if defined(RTE_TOOLCHAIN_GCC) && (GCC_VERSION < 70100)
469 * '__sync' builtins are deprecated, but '__atomic' ones
470 * are sub-optimized in older GCC versions.
472 __sync_fetch_and_or(log_base + elem->offset, elem->val);
474 __atomic_fetch_or(log_base + elem->offset, elem->val,
481 vq->log_cache_nb_elem = 0;
484 static __rte_always_inline void
485 vhost_log_cache_page(struct virtio_net *dev, struct vhost_virtqueue *vq,
488 uint32_t bit_nr = page % (sizeof(unsigned long) << 3);
489 uint32_t offset = page / (sizeof(unsigned long) << 3);
492 for (i = 0; i < vq->log_cache_nb_elem; i++) {
493 struct log_cache_entry *elem = vq->log_cache + i;
495 if (elem->offset == offset) {
496 elem->val |= (1UL << bit_nr);
501 if (unlikely(i >= VHOST_LOG_CACHE_NR)) {
503 * No more room for a new log cache entry,
504 * so write the dirty log map directly.
507 vhost_log_page((uint8_t *)(uintptr_t)dev->log_base, page);
512 vq->log_cache[i].offset = offset;
513 vq->log_cache[i].val = (1UL << bit_nr);
514 vq->log_cache_nb_elem++;
517 static __rte_always_inline void
518 vhost_log_cache_write(struct virtio_net *dev, struct vhost_virtqueue *vq,
519 uint64_t addr, uint64_t len)
523 if (likely(((dev->features & (1ULL << VHOST_F_LOG_ALL)) == 0) ||
524 !dev->log_base || !len))
527 if (unlikely(dev->log_size <= ((addr + len - 1) / VHOST_LOG_PAGE / 8)))
530 page = addr / VHOST_LOG_PAGE;
531 while (page * VHOST_LOG_PAGE < addr + len) {
532 vhost_log_cache_page(dev, vq, page);
537 static __rte_always_inline void
538 vhost_log_cache_used_vring(struct virtio_net *dev, struct vhost_virtqueue *vq,
539 uint64_t offset, uint64_t len)
541 vhost_log_cache_write(dev, vq, vq->log_guest_addr + offset, len);
544 static __rte_always_inline void
545 vhost_log_used_vring(struct virtio_net *dev, struct vhost_virtqueue *vq,
546 uint64_t offset, uint64_t len)
548 vhost_log_write(dev, vq->log_guest_addr + offset, len);
551 /* Macros for printing using RTE_LOG */
552 #define RTE_LOGTYPE_VHOST_CONFIG RTE_LOGTYPE_USER1
553 #define RTE_LOGTYPE_VHOST_DATA RTE_LOGTYPE_USER1
555 #ifdef RTE_LIBRTE_VHOST_DEBUG
556 #define VHOST_MAX_PRINT_BUFF 6072
557 #define VHOST_LOG_DEBUG(log_type, fmt, args...) \
558 RTE_LOG(DEBUG, log_type, fmt, ##args)
559 #define PRINT_PACKET(device, addr, size, header) do { \
560 char *pkt_addr = (char *)(addr); \
561 unsigned int index; \
562 char packet[VHOST_MAX_PRINT_BUFF]; \
565 snprintf(packet, VHOST_MAX_PRINT_BUFF, "(%d) Header size %d: ", (device->vid), (size)); \
567 snprintf(packet, VHOST_MAX_PRINT_BUFF, "(%d) Packet size %d: ", (device->vid), (size)); \
568 for (index = 0; index < (size); index++) { \
569 snprintf(packet + strnlen(packet, VHOST_MAX_PRINT_BUFF), VHOST_MAX_PRINT_BUFF - strnlen(packet, VHOST_MAX_PRINT_BUFF), \
570 "%02hhx ", pkt_addr[index]); \
572 snprintf(packet + strnlen(packet, VHOST_MAX_PRINT_BUFF), VHOST_MAX_PRINT_BUFF - strnlen(packet, VHOST_MAX_PRINT_BUFF), "\n"); \
574 VHOST_LOG_DEBUG(VHOST_DATA, "%s", packet); \
577 #define VHOST_LOG_DEBUG(log_type, fmt, args...) do {} while (0)
578 #define PRINT_PACKET(device, addr, size, header) do {} while (0)
581 extern uint64_t VHOST_FEATURES;
582 #define MAX_VHOST_DEVICE 1024
583 extern struct virtio_net *vhost_devices[MAX_VHOST_DEVICE];
585 /* Convert guest physical address to host physical address */
586 static __rte_always_inline rte_iova_t
587 gpa_to_hpa(struct virtio_net *dev, uint64_t gpa, uint64_t size)
590 struct guest_page *page;
592 for (i = 0; i < dev->nr_guest_pages; i++) {
593 page = &dev->guest_pages[i];
595 if (gpa >= page->guest_phys_addr &&
596 gpa + size < page->guest_phys_addr + page->size) {
597 return gpa - page->guest_phys_addr +
598 page->host_phys_addr;
605 static __rte_always_inline struct virtio_net *
608 struct virtio_net *dev = vhost_devices[vid];
610 if (unlikely(!dev)) {
611 RTE_LOG(ERR, VHOST_CONFIG,
612 "(%d) device not found.\n", vid);
618 int vhost_new_device(void);
619 void cleanup_device(struct virtio_net *dev, int destroy);
620 void reset_device(struct virtio_net *dev);
621 void vhost_destroy_device(int);
622 void vhost_destroy_device_notify(struct virtio_net *dev);
624 void cleanup_vq(struct vhost_virtqueue *vq, int destroy);
625 void free_vq(struct virtio_net *dev, struct vhost_virtqueue *vq);
627 int alloc_vring_queue(struct virtio_net *dev, uint32_t vring_idx);
629 void vhost_attach_vdpa_device(int vid, int did);
631 void vhost_set_ifname(int, const char *if_name, unsigned int if_len);
632 void vhost_enable_dequeue_zero_copy(int vid);
633 void vhost_set_builtin_virtio_net(int vid, bool enable);
635 struct vhost_device_ops const *vhost_driver_callback_get(const char *path);
638 * Backend-specific cleanup.
640 * TODO: fix it; we have one backend now
642 void vhost_backend_cleanup(struct virtio_net *dev);
644 uint64_t __vhost_iova_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
645 uint64_t iova, uint64_t *len, uint8_t perm);
646 int vring_translate(struct virtio_net *dev, struct vhost_virtqueue *vq);
647 void vring_invalidate(struct virtio_net *dev, struct vhost_virtqueue *vq);
649 static __rte_always_inline uint64_t
650 vhost_iova_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
651 uint64_t iova, uint64_t *len, uint8_t perm)
653 if (!(dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)))
654 return rte_vhost_va_from_guest_pa(dev->mem, iova, len);
656 return __vhost_iova_to_vva(dev, vq, iova, len, perm);
659 #define vhost_avail_event(vr) \
660 (*(volatile uint16_t*)&(vr)->used->ring[(vr)->size])
661 #define vhost_used_event(vr) \
662 (*(volatile uint16_t*)&(vr)->avail->ring[(vr)->size])
665 * The following is used with VIRTIO_RING_F_EVENT_IDX.
666 * Assuming a given event_idx value from the other size, if we have
667 * just incremented index from old to new_idx, should we trigger an
670 static __rte_always_inline int
671 vhost_need_event(uint16_t event_idx, uint16_t new_idx, uint16_t old)
673 return (uint16_t)(new_idx - event_idx - 1) < (uint16_t)(new_idx - old);
676 static __rte_always_inline void
677 vhost_vring_call_split(struct virtio_net *dev, struct vhost_virtqueue *vq)
679 /* Flush used->idx update before we read avail->flags. */
682 /* Don't kick guest if we don't reach index specified by guest. */
683 if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX)) {
684 uint16_t old = vq->signalled_used;
685 uint16_t new = vq->last_used_idx;
687 VHOST_LOG_DEBUG(VHOST_DATA, "%s: used_event_idx=%d, old=%d, new=%d\n",
689 vhost_used_event(vq),
691 if (vhost_need_event(vhost_used_event(vq), new, old)
692 && (vq->callfd >= 0)) {
693 vq->signalled_used = vq->last_used_idx;
694 eventfd_write(vq->callfd, (eventfd_t) 1);
697 /* Kick the guest if necessary. */
698 if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT)
699 && (vq->callfd >= 0))
700 eventfd_write(vq->callfd, (eventfd_t)1);
704 static __rte_always_inline void
705 vhost_vring_call_packed(struct virtio_net *dev, struct vhost_virtqueue *vq)
707 uint16_t old, new, off, off_wrap;
708 bool signalled_used_valid, kick = false;
710 /* Flush used desc update. */
713 if (!(dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))) {
714 if (vq->driver_event->flags !=
715 VRING_EVENT_F_DISABLE)
720 old = vq->signalled_used;
721 new = vq->last_used_idx;
722 vq->signalled_used = new;
723 signalled_used_valid = vq->signalled_used_valid;
724 vq->signalled_used_valid = true;
726 if (vq->driver_event->flags != VRING_EVENT_F_DESC) {
727 if (vq->driver_event->flags != VRING_EVENT_F_DISABLE)
732 if (unlikely(!signalled_used_valid)) {
739 off_wrap = vq->driver_event->off_wrap;
740 off = off_wrap & ~(1 << 15);
745 if (vq->used_wrap_counter != off_wrap >> 15)
748 if (vhost_need_event(off, new, old))
752 eventfd_write(vq->callfd, (eventfd_t)1);
755 static __rte_always_inline void *
756 alloc_copy_ind_table(struct virtio_net *dev, struct vhost_virtqueue *vq,
757 uint64_t desc_addr, uint64_t desc_len)
761 uint64_t len, remain = desc_len;
763 idesc = rte_malloc(__func__, desc_len, 0);
764 if (unlikely(!idesc))
767 dst = (uint64_t)(uintptr_t)idesc;
771 src = vhost_iova_to_vva(dev, vq, desc_addr, &len,
773 if (unlikely(!src || !len)) {
778 rte_memcpy((void *)(uintptr_t)dst, (void *)(uintptr_t)src, len);
788 static __rte_always_inline void
789 free_ind_table(void *idesc)
794 #endif /* _VHOST_NET_CDEV_H_ */