[ceph.git] / ceph / src / seastar / dpdk / lib / librte_vhost / vhost.c

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2010-2017 Intel Corporation
 */

#include <linux/vhost.h>
#include <linux/virtio_net.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#ifdef RTE_LIBRTE_VHOST_NUMA
#include <numa.h>
#include <numaif.h>
#endif

#include <rte_errno.h>
#include <rte_ethdev.h>
#include <rte_log.h>
#include <rte_string_fns.h>
#include <rte_memory.h>
#include <rte_malloc.h>
#include <rte_vhost.h>
#include <rte_rwlock.h>

#include "iotlb.h"
#include "vhost.h"
#include "vhost_user.h"

struct virtio_net *vhost_devices[MAX_VHOST_DEVICE];

/* Called with iotlb_lock read-locked */
uint64_t
__vhost_iova_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
		    uint64_t iova, uint64_t *size, uint8_t perm)
{
	uint64_t vva, tmp_size;

	if (unlikely(!*size))
		return 0;

	tmp_size = *size;

	vva = vhost_user_iotlb_cache_find(vq, iova, &tmp_size, perm);
	if (tmp_size == *size)
		return vva;

	iova += tmp_size;

	if (!vhost_user_iotlb_pending_miss(vq, iova, perm)) {
		/*
		 * iotlb_lock is read-locked for a full burst,
		 * but it only protects the iotlb cache.
		 * In case of IOTLB miss, we might block on the socket,
		 * which could cause a deadlock with QEMU if an IOTLB update
		 * is being handled. We can safely unlock here to avoid it.
		 */
		vhost_user_iotlb_rd_unlock(vq);

		vhost_user_iotlb_pending_insert(vq, iova, perm);
		if (vhost_user_iotlb_miss(dev, iova, perm)) {
			RTE_LOG(ERR, VHOST_CONFIG,
				"IOTLB miss req failed for IOVA 0x%" PRIx64 "\n",
				iova);
			vhost_user_iotlb_pending_remove(vq, iova, 1, perm);
		}

		vhost_user_iotlb_rd_lock(vq);
	}

	return 0;
}

void
cleanup_vq(struct vhost_virtqueue *vq, int destroy)
{
	if ((vq->callfd >= 0) && (destroy != 0))
		close(vq->callfd);
	if (vq->kickfd >= 0)
		close(vq->kickfd);
}

/*
 * Unmap any memory, close any file descriptors and
 * free any memory owned by a device.
 */
void
cleanup_device(struct virtio_net *dev, int destroy)
{
	uint32_t i;

	vhost_backend_cleanup(dev);

	for (i = 0; i < dev->nr_vring; i++)
		cleanup_vq(dev->virtqueue[i], destroy);
}

void
free_vq(struct virtio_net *dev, struct vhost_virtqueue *vq)
{
	if (vq_is_packed(dev))
		rte_free(vq->shadow_used_packed);
	else
		rte_free(vq->shadow_used_split);
	rte_free(vq->batch_copy_elems);
	rte_mempool_free(vq->iotlb_pool);
	rte_free(vq);
}

/*
 * Release virtqueues and device memory.
 */
static void
free_device(struct virtio_net *dev)
{
	uint32_t i;

	for (i = 0; i < dev->nr_vring; i++)
		free_vq(dev, dev->virtqueue[i]);

	rte_free(dev);
}

static int
vring_translate_split(struct virtio_net *dev, struct vhost_virtqueue *vq)
{
	uint64_t req_size, size;

	req_size = sizeof(struct vring_desc) * vq->size;
	size = req_size;
	vq->desc = (struct vring_desc *)(uintptr_t)vhost_iova_to_vva(dev, vq,
						vq->ring_addrs.desc_user_addr,
						&size, VHOST_ACCESS_RW);
	if (!vq->desc || size != req_size)
		return -1;

	req_size = sizeof(struct vring_avail);
	req_size += sizeof(uint16_t) * vq->size;
	if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))
		req_size += sizeof(uint16_t);
	size = req_size;
	vq->avail = (struct vring_avail *)(uintptr_t)vhost_iova_to_vva(dev, vq,
						vq->ring_addrs.avail_user_addr,
						&size, VHOST_ACCESS_RW);
	if (!vq->avail || size != req_size)
		return -1;

	req_size = sizeof(struct vring_used);
	req_size += sizeof(struct vring_used_elem) * vq->size;
	if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))
		req_size += sizeof(uint16_t);
	size = req_size;
	vq->used = (struct vring_used *)(uintptr_t)vhost_iova_to_vva(dev, vq,
						vq->ring_addrs.used_user_addr,
						&size, VHOST_ACCESS_RW);
	if (!vq->used || size != req_size)
		return -1;

	return 0;
}

static int
vring_translate_packed(struct virtio_net *dev, struct vhost_virtqueue *vq)
{
	uint64_t req_size, size;

	req_size = sizeof(struct vring_packed_desc) * vq->size;
	size = req_size;
	vq->desc_packed = (struct vring_packed_desc *)(uintptr_t)
		vhost_iova_to_vva(dev, vq, vq->ring_addrs.desc_user_addr,
				&size, VHOST_ACCESS_RW);
	if (!vq->desc_packed || size != req_size)
		return -1;

	req_size = sizeof(struct vring_packed_desc_event);
	size = req_size;
	vq->driver_event = (struct vring_packed_desc_event *)(uintptr_t)
		vhost_iova_to_vva(dev, vq, vq->ring_addrs.avail_user_addr,
				&size, VHOST_ACCESS_RW);
	if (!vq->driver_event || size != req_size)
		return -1;

	req_size = sizeof(struct vring_packed_desc_event);
	size = req_size;
	vq->device_event = (struct vring_packed_desc_event *)(uintptr_t)
		vhost_iova_to_vva(dev, vq, vq->ring_addrs.used_user_addr,
				&size, VHOST_ACCESS_RW);
	if (!vq->device_event || size != req_size)
		return -1;

	return 0;
}

int
vring_translate(struct virtio_net *dev, struct vhost_virtqueue *vq)
{

	if (!(dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)))
		goto out;

	if (vq_is_packed(dev)) {
		if (vring_translate_packed(dev, vq) < 0)
			return -1;
	} else {
		if (vring_translate_split(dev, vq) < 0)
			return -1;
	}
out:
	vq->access_ok = 1;

	return 0;
}

void
vring_invalidate(struct virtio_net *dev, struct vhost_virtqueue *vq)
{
	if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
		vhost_user_iotlb_wr_lock(vq);

	vq->access_ok = 0;
	vq->desc = NULL;
	vq->avail = NULL;
	vq->used = NULL;

	if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
		vhost_user_iotlb_wr_unlock(vq);
}

static void
init_vring_queue(struct virtio_net *dev, uint32_t vring_idx)
{
	struct vhost_virtqueue *vq;

	if (vring_idx >= VHOST_MAX_VRING) {
		RTE_LOG(ERR, VHOST_CONFIG,
				"Failed not init vring, out of bound (%d)\n",
				vring_idx);
		return;
	}

	vq = dev->virtqueue[vring_idx];

	memset(vq, 0, sizeof(struct vhost_virtqueue));

	vq->kickfd = VIRTIO_UNINITIALIZED_EVENTFD;
	vq->callfd = VIRTIO_UNINITIALIZED_EVENTFD;

	vhost_user_iotlb_init(dev, vring_idx);
	/* Backends are set to -1 indicating an inactive device. */
	vq->backend = -1;

	TAILQ_INIT(&vq->zmbuf_list);
}

static void
reset_vring_queue(struct virtio_net *dev, uint32_t vring_idx)
{
	struct vhost_virtqueue *vq;
	int callfd;

	if (vring_idx >= VHOST_MAX_VRING) {
		RTE_LOG(ERR, VHOST_CONFIG,
				"Failed not init vring, out of bound (%d)\n",
				vring_idx);
		return;
	}

	vq = dev->virtqueue[vring_idx];
	callfd = vq->callfd;
	init_vring_queue(dev, vring_idx);
	vq->callfd = callfd;
}

int
alloc_vring_queue(struct virtio_net *dev, uint32_t vring_idx)
{
	struct vhost_virtqueue *vq;

	vq = rte_malloc(NULL, sizeof(struct vhost_virtqueue), 0);
	if (vq == NULL) {
		RTE_LOG(ERR, VHOST_CONFIG,
			"Failed to allocate memory for vring:%u.\n", vring_idx);
		return -1;
	}

	dev->virtqueue[vring_idx] = vq;
	init_vring_queue(dev, vring_idx);
	rte_spinlock_init(&vq->access_lock);
	vq->avail_wrap_counter = 1;
	vq->used_wrap_counter = 1;
	vq->signalled_used_valid = false;

	dev->nr_vring += 1;

	return 0;
}

/*
 * Reset some variables in device structure, while keeping few
 * others untouched, such as vid, ifname, nr_vring: they
 * should be same unless the device is removed.
 */
void
reset_device(struct virtio_net *dev)
{
	uint32_t i;

	dev->features = 0;
	dev->protocol_features = 0;
	dev->flags &= VIRTIO_DEV_BUILTIN_VIRTIO_NET;

	for (i = 0; i < dev->nr_vring; i++)
		reset_vring_queue(dev, i);
}

/*
 * Invoked when there is a new vhost-user connection established (when
 * there is a new virtio device being attached).
 */
int
vhost_new_device(void)
{
	struct virtio_net *dev;
	int i;

	for (i = 0; i < MAX_VHOST_DEVICE; i++) {
		if (vhost_devices[i] == NULL)
			break;
	}

	if (i == MAX_VHOST_DEVICE) {
		RTE_LOG(ERR, VHOST_CONFIG,
			"Failed to find a free slot for new device.\n");
		return -1;
	}

	dev = rte_zmalloc(NULL, sizeof(struct virtio_net), 0);
	if (dev == NULL) {
		RTE_LOG(ERR, VHOST_CONFIG,
			"Failed to allocate memory for new dev.\n");
		return -1;
	}

	vhost_devices[i] = dev;
	dev->vid = i;
	dev->flags = VIRTIO_DEV_BUILTIN_VIRTIO_NET;
	dev->slave_req_fd = -1;
	dev->vdpa_dev_id = -1;
	dev->postcopy_ufd = -1;
	rte_spinlock_init(&dev->slave_req_lock);

	return i;
}

void
vhost_destroy_device_notify(struct virtio_net *dev)
{
	struct rte_vdpa_device *vdpa_dev;
	int did;

	if (dev->flags & VIRTIO_DEV_RUNNING) {
		did = dev->vdpa_dev_id;
		vdpa_dev = rte_vdpa_get_device(did);
		if (vdpa_dev && vdpa_dev->ops->dev_close)
			vdpa_dev->ops->dev_close(dev->vid);
		dev->flags &= ~VIRTIO_DEV_RUNNING;
		dev->notify_ops->destroy_device(dev->vid);
	}
}

/*
 * Invoked when there is the vhost-user connection is broken (when
 * the virtio device is being detached).
 */
void
vhost_destroy_device(int vid)
{
	struct virtio_net *dev = get_device(vid);

	if (dev == NULL)
		return;

	vhost_destroy_device_notify(dev);

	cleanup_device(dev, 1);
	free_device(dev);

	vhost_devices[vid] = NULL;
}

void
vhost_attach_vdpa_device(int vid, int did)
{
	struct virtio_net *dev = get_device(vid);

	if (dev == NULL)
		return;

	if (rte_vdpa_get_device(did) == NULL)
		return;

	dev->vdpa_dev_id = did;
}

void
vhost_set_ifname(int vid, const char *if_name, unsigned int if_len)
{
	struct virtio_net *dev;
	unsigned int len;

	dev = get_device(vid);
	if (dev == NULL)
		return;

	len = if_len > sizeof(dev->ifname) ?
		sizeof(dev->ifname) : if_len;

	strncpy(dev->ifname, if_name, len);
	dev->ifname[sizeof(dev->ifname) - 1] = '\0';
}

void
vhost_enable_dequeue_zero_copy(int vid)
{
	struct virtio_net *dev = get_device(vid);

	if (dev == NULL)
		return;

	dev->dequeue_zero_copy = 1;
}

void
vhost_set_builtin_virtio_net(int vid, bool enable)
{
	struct virtio_net *dev = get_device(vid);

	if (dev == NULL)
		return;

	if (enable)
		dev->flags |= VIRTIO_DEV_BUILTIN_VIRTIO_NET;
	else
		dev->flags &= ~VIRTIO_DEV_BUILTIN_VIRTIO_NET;
}

int
rte_vhost_get_mtu(int vid, uint16_t *mtu)
{
	struct virtio_net *dev = get_device(vid);

	if (dev == NULL || mtu == NULL)
		return -ENODEV;

	if (!(dev->flags & VIRTIO_DEV_READY))
		return -EAGAIN;

	if (!(dev->features & (1ULL << VIRTIO_NET_F_MTU)))
		return -ENOTSUP;

	*mtu = dev->mtu;

	return 0;
}

int
rte_vhost_get_numa_node(int vid)
{
#ifdef RTE_LIBRTE_VHOST_NUMA
	struct virtio_net *dev = get_device(vid);
	int numa_node;
	int ret;

	if (dev == NULL || numa_available() != 0)
		return -1;

	ret = get_mempolicy(&numa_node, NULL, 0, dev,
			    MPOL_F_NODE | MPOL_F_ADDR);
	if (ret < 0) {
		RTE_LOG(ERR, VHOST_CONFIG,
			"(%d) failed to query numa node: %s\n",
			vid, rte_strerror(errno));
		return -1;
	}

	return numa_node;
#else
	RTE_SET_USED(vid);
	return -1;
#endif
}

uint32_t
rte_vhost_get_queue_num(int vid)
{
	struct virtio_net *dev = get_device(vid);

	if (dev == NULL)
		return 0;

	return dev->nr_vring / 2;
}

uint16_t
rte_vhost_get_vring_num(int vid)
{
	struct virtio_net *dev = get_device(vid);

	if (dev == NULL)
		return 0;

	return dev->nr_vring;
}

int
rte_vhost_get_ifname(int vid, char *buf, size_t len)
{
	struct virtio_net *dev = get_device(vid);

	if (dev == NULL || buf == NULL)
		return -1;

	len = RTE_MIN(len, sizeof(dev->ifname));

	strncpy(buf, dev->ifname, len);
	buf[len - 1] = '\0';

	return 0;
}

int
rte_vhost_get_negotiated_features(int vid, uint64_t *features)
{
	struct virtio_net *dev;

	dev = get_device(vid);
	if (dev == NULL || features == NULL)
		return -1;

	*features = dev->features;
	return 0;
}

int
rte_vhost_get_mem_table(int vid, struct rte_vhost_memory **mem)
{
	struct virtio_net *dev;
	struct rte_vhost_memory *m;
	size_t size;

	dev = get_device(vid);
	if (dev == NULL || mem == NULL)
		return -1;

	size = dev->mem->nregions * sizeof(struct rte_vhost_mem_region);
	m = malloc(sizeof(struct rte_vhost_memory) + size);
	if (!m)
		return -1;

	m->nregions = dev->mem->nregions;
	memcpy(m->regions, dev->mem->regions, size);
	*mem = m;

	return 0;
}

int
rte_vhost_get_vhost_vring(int vid, uint16_t vring_idx,
			  struct rte_vhost_vring *vring)
{
	struct virtio_net *dev;
	struct vhost_virtqueue *vq;

	dev = get_device(vid);
	if (dev == NULL || vring == NULL)
		return -1;

	if (vring_idx >= VHOST_MAX_VRING)
		return -1;

	vq = dev->virtqueue[vring_idx];
	if (!vq)
		return -1;

	vring->desc  = vq->desc;
	vring->avail = vq->avail;
	vring->used  = vq->used;
	vring->log_guest_addr  = vq->log_guest_addr;

	vring->callfd  = vq->callfd;
	vring->kickfd  = vq->kickfd;
	vring->size    = vq->size;

	return 0;
}

int
rte_vhost_vring_call(int vid, uint16_t vring_idx)
{
	struct virtio_net *dev;
	struct vhost_virtqueue *vq;

	dev = get_device(vid);
	if (!dev)
		return -1;

	if (vring_idx >= VHOST_MAX_VRING)
		return -1;

	vq = dev->virtqueue[vring_idx];
	if (!vq)
		return -1;

	if (vq_is_packed(dev))
		vhost_vring_call_packed(dev, vq);
	else
		vhost_vring_call_split(dev, vq);

	return 0;
}

uint16_t
rte_vhost_avail_entries(int vid, uint16_t queue_id)
{
	struct virtio_net *dev;
	struct vhost_virtqueue *vq;

	dev = get_device(vid);
	if (!dev)
		return 0;

	vq = dev->virtqueue[queue_id];
	if (!vq->enabled)
		return 0;

	return *(volatile uint16_t *)&vq->avail->idx - vq->last_used_idx;
}

static inline void
vhost_enable_notify_split(struct virtio_net *dev,
		struct vhost_virtqueue *vq, int enable)
{
	if (!(dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))) {
		if (enable)
			vq->used->flags &= ~VRING_USED_F_NO_NOTIFY;
		else
			vq->used->flags |= VRING_USED_F_NO_NOTIFY;
	} else {
		if (enable)
			vhost_avail_event(vq) = vq->last_avail_idx;
	}
}

static inline void
vhost_enable_notify_packed(struct virtio_net *dev,
		struct vhost_virtqueue *vq, int enable)
{
	uint16_t flags;

	if (!enable) {
		vq->device_event->flags = VRING_EVENT_F_DISABLE;
		return;
	}

	flags = VRING_EVENT_F_ENABLE;
	if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX)) {
		flags = VRING_EVENT_F_DESC;
		vq->device_event->off_wrap = vq->last_avail_idx |
			vq->avail_wrap_counter << 15;
	}

	rte_smp_wmb();

	vq->device_event->flags = flags;
}

int
rte_vhost_enable_guest_notification(int vid, uint16_t queue_id, int enable)
{
	struct virtio_net *dev = get_device(vid);
	struct vhost_virtqueue *vq;

	if (!dev)
		return -1;

	vq = dev->virtqueue[queue_id];

	if (vq_is_packed(dev))
		vhost_enable_notify_packed(dev, vq, enable);
	else
		vhost_enable_notify_split(dev, vq, enable);

	return 0;
}

void
rte_vhost_log_write(int vid, uint64_t addr, uint64_t len)
{
	struct virtio_net *dev = get_device(vid);

	if (dev == NULL)
		return;

	vhost_log_write(dev, addr, len);
}

void
rte_vhost_log_used_vring(int vid, uint16_t vring_idx,
			 uint64_t offset, uint64_t len)
{
	struct virtio_net *dev;
	struct vhost_virtqueue *vq;

	dev = get_device(vid);
	if (dev == NULL)
		return;

	if (vring_idx >= VHOST_MAX_VRING)
		return;
	vq = dev->virtqueue[vring_idx];
	if (!vq)
		return;

	vhost_log_used_vring(dev, vq, offset, len);
}

uint32_t
rte_vhost_rx_queue_count(int vid, uint16_t qid)
{
	struct virtio_net *dev;
	struct vhost_virtqueue *vq;

	dev = get_device(vid);
	if (dev == NULL)
		return 0;

	if (unlikely(qid >= dev->nr_vring || (qid & 1) == 0)) {
		RTE_LOG(ERR, VHOST_DATA, "(%d) %s: invalid virtqueue idx %d.\n",
			dev->vid, __func__, qid);
		return 0;
	}

	vq = dev->virtqueue[qid];
	if (vq == NULL)
		return 0;

	if (unlikely(vq->enabled == 0 || vq->avail == NULL))
		return 0;

	return *((volatile uint16_t *)&vq->avail->idx) - vq->last_avail_idx;
}

int rte_vhost_get_vdpa_device_id(int vid)
{
	struct virtio_net *dev = get_device(vid);

	if (dev == NULL)
		return -1;

	return dev->vdpa_dev_id;
}

int rte_vhost_get_log_base(int vid, uint64_t *log_base,
		uint64_t *log_size)
{
	struct virtio_net *dev = get_device(vid);

	if (dev == NULL || log_base == NULL || log_size == NULL)
		return -1;

	*log_base = dev->log_base;
	*log_size = dev->log_size;

	return 0;
}

int rte_vhost_get_vring_base(int vid, uint16_t queue_id,
		uint16_t *last_avail_idx, uint16_t *last_used_idx)
{
	struct virtio_net *dev = get_device(vid);

	if (dev == NULL || last_avail_idx == NULL || last_used_idx == NULL)
		return -1;

	*last_avail_idx = dev->virtqueue[queue_id]->last_avail_idx;
	*last_used_idx = dev->virtqueue[queue_id]->last_used_idx;

	return 0;
}

int rte_vhost_set_vring_base(int vid, uint16_t queue_id,
		uint16_t last_avail_idx, uint16_t last_used_idx)
{
	struct virtio_net *dev = get_device(vid);

	if (!dev)
		return -1;

	dev->virtqueue[queue_id]->last_avail_idx = last_avail_idx;
	dev->virtqueue[queue_id]->last_used_idx = last_used_idx;

	return 0;
}

int rte_vhost_extern_callback_register(int vid,
		struct rte_vhost_user_extern_ops const * const ops, void *ctx)
{
	struct virtio_net *dev = get_device(vid);

	if (dev == NULL || ops == NULL)
		return -1;

	dev->extern_ops = *ops;
	dev->extern_data = ctx;
	return 0;
}
Commit	Line	Data
9f95a23c TL	1	/* SPDX-License-Identifier: BSD-3-Clause
9f95a23c TL	2	* Copyright(c) 2010-2017 Intel Corporation
7c673cae FG	3	*/
	4
	5	#include <linux/vhost.h>
	6	#include <linux/virtio_net.h>
	7	#include <stddef.h>
	8	#include <stdint.h>
	9	#include <stdlib.h>
	10	#ifdef RTE_LIBRTE_VHOST_NUMA
9f95a23c	11	#include <numa.h>
7c673cae FG	12	#include <numaif.h>
	13	#endif
	14
9f95a23c	15	#include <rte_errno.h>
7c673cae FG	16	#include <rte_ethdev.h>
	17	#include <rte_log.h>
	18	#include <rte_string_fns.h>
	19	#include <rte_memory.h>
	20	#include <rte_malloc.h>
11fdf7f2	21	#include <rte_vhost.h>
9f95a23c	22	#include <rte_rwlock.h>
7c673cae	23
9f95a23c	24	#include "iotlb.h"
7c673cae	25	#include "vhost.h"
9f95a23c	26	#include "vhost_user.h"
7c673cae	27
7c673cae FG	28	struct virtio_net *vhost_devices[MAX_VHOST_DEVICE];
7c673cae FG	29
9f95a23c TL	30	/* Called with iotlb_lock read-locked */
	31	uint64_t
	32	__vhost_iova_to_vva(struct virtio_net dev, struct vhost_virtqueue vq,
	33	uint64_t iova, uint64_t *size, uint8_t perm)
7c673cae	34	{
9f95a23c	35	uint64_t vva, tmp_size;
7c673cae	36
9f95a23c TL	37	if (unlikely(!*size))
	38	return 0;
	39
	40	tmp_size = *size;
	41
	42	vva = vhost_user_iotlb_cache_find(vq, iova, &tmp_size, perm);
	43	if (tmp_size == *size)
	44	return vva;
	45
	46	iova += tmp_size;
	47
	48	if (!vhost_user_iotlb_pending_miss(vq, iova, perm)) {
	49	/*
	50	* iotlb_lock is read-locked for a full burst,
	51	* but it only protects the iotlb cache.
	52	* In case of IOTLB miss, we might block on the socket,
	53	* which could cause a deadlock with QEMU if an IOTLB update
	54	* is being handled. We can safely unlock here to avoid it.
	55	*/
	56	vhost_user_iotlb_rd_unlock(vq);
	57
	58	vhost_user_iotlb_pending_insert(vq, iova, perm);
	59	if (vhost_user_iotlb_miss(dev, iova, perm)) {
	60	RTE_LOG(ERR, VHOST_CONFIG,
	61	"IOTLB miss req failed for IOVA 0x%" PRIx64 "\n",
	62	iova);
	63	vhost_user_iotlb_pending_remove(vq, iova, 1, perm);
	64	}
	65
	66	vhost_user_iotlb_rd_lock(vq);
7c673cae FG	67	}
7c673cae FG	68
9f95a23c	69	return 0;
7c673cae FG	70	}
7c673cae FG	71
9f95a23c	72	void
7c673cae FG	73	cleanup_vq(struct vhost_virtqueue *vq, int destroy)
	74	{
	75	if ((vq->callfd >= 0) && (destroy != 0))
	76	close(vq->callfd);
	77	if (vq->kickfd >= 0)
	78	close(vq->kickfd);
	79	}
	80
	81	/*
	82	* Unmap any memory, close any file descriptors and
	83	* free any memory owned by a device.
	84	*/
	85	void
	86	cleanup_device(struct virtio_net *dev, int destroy)
	87	{
	88	uint32_t i;
	89
	90	vhost_backend_cleanup(dev);
	91
11fdf7f2 TL	92	for (i = 0; i < dev->nr_vring; i++)
11fdf7f2 TL	93	cleanup_vq(dev->virtqueue[i], destroy);
7c673cae FG	94	}
7c673cae FG	95
9f95a23c TL	96	void
	97	free_vq(struct virtio_net dev, struct vhost_virtqueue vq)
	98	{
	99	if (vq_is_packed(dev))
	100	rte_free(vq->shadow_used_packed);
	101	else
	102	rte_free(vq->shadow_used_split);
	103	rte_free(vq->batch_copy_elems);
	104	rte_mempool_free(vq->iotlb_pool);
	105	rte_free(vq);
	106	}
	107
7c673cae FG	108	/*
	109	* Release virtqueues and device memory.
	110	*/
	111	static void
	112	free_device(struct virtio_net *dev)
	113	{
	114	uint32_t i;
7c673cae	115
9f95a23c TL	116	for (i = 0; i < dev->nr_vring; i++)
	117	free_vq(dev, dev->virtqueue[i]);
	118
	119	rte_free(dev);
	120	}
	121
	122	static int
	123	vring_translate_split(struct virtio_net dev, struct vhost_virtqueue vq)
	124	{
	125	uint64_t req_size, size;
	126
	127	req_size = sizeof(struct vring_desc) * vq->size;
	128	size = req_size;
	129	vq->desc = (struct vring_desc *)(uintptr_t)vhost_iova_to_vva(dev, vq,
	130	vq->ring_addrs.desc_user_addr,
	131	&size, VHOST_ACCESS_RW);
	132	if (!vq->desc \|\| size != req_size)
	133	return -1;
	134
	135	req_size = sizeof(struct vring_avail);
	136	req_size += sizeof(uint16_t) * vq->size;
	137	if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))
	138	req_size += sizeof(uint16_t);
	139	size = req_size;
	140	vq->avail = (struct vring_avail *)(uintptr_t)vhost_iova_to_vva(dev, vq,
	141	vq->ring_addrs.avail_user_addr,
	142	&size, VHOST_ACCESS_RW);
	143	if (!vq->avail \|\| size != req_size)
	144	return -1;
	145
	146	req_size = sizeof(struct vring_used);
	147	req_size += sizeof(struct vring_used_elem) * vq->size;
	148	if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))
	149	req_size += sizeof(uint16_t);
	150	size = req_size;
	151	vq->used = (struct vring_used *)(uintptr_t)vhost_iova_to_vva(dev, vq,
	152	vq->ring_addrs.used_user_addr,
	153	&size, VHOST_ACCESS_RW);
	154	if (!vq->used \|\| size != req_size)
	155	return -1;
7c673cae	156
9f95a23c TL	157	return 0;
9f95a23c TL	158	}
7c673cae	159
9f95a23c TL	160	static int
	161	vring_translate_packed(struct virtio_net dev, struct vhost_virtqueue vq)
	162	{
	163	uint64_t req_size, size;
	164
	165	req_size = sizeof(struct vring_packed_desc) * vq->size;
	166	size = req_size;
	167	vq->desc_packed = (struct vring_packed_desc *)(uintptr_t)
	168	vhost_iova_to_vva(dev, vq, vq->ring_addrs.desc_user_addr,
	169	&size, VHOST_ACCESS_RW);
	170	if (!vq->desc_packed \|\| size != req_size)
	171	return -1;
	172
	173	req_size = sizeof(struct vring_packed_desc_event);
	174	size = req_size;
	175	vq->driver_event = (struct vring_packed_desc_event *)(uintptr_t)
	176	vhost_iova_to_vva(dev, vq, vq->ring_addrs.avail_user_addr,
	177	&size, VHOST_ACCESS_RW);
	178	if (!vq->driver_event \|\| size != req_size)
	179	return -1;
	180
	181	req_size = sizeof(struct vring_packed_desc_event);
	182	size = req_size;
	183	vq->device_event = (struct vring_packed_desc_event *)(uintptr_t)
	184	vhost_iova_to_vva(dev, vq, vq->ring_addrs.used_user_addr,
	185	&size, VHOST_ACCESS_RW);
	186	if (!vq->device_event \|\| size != req_size)
	187	return -1;
	188
	189	return 0;
	190	}
	191
	192	int
	193	vring_translate(struct virtio_net dev, struct vhost_virtqueue vq)
	194	{
	195
	196	if (!(dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)))
	197	goto out;
	198
	199	if (vq_is_packed(dev)) {
	200	if (vring_translate_packed(dev, vq) < 0)
	201	return -1;
	202	} else {
	203	if (vring_translate_split(dev, vq) < 0)
	204	return -1;
7c673cae	205	}
9f95a23c TL	206	out:
9f95a23c TL	207	vq->access_ok = 1;
7c673cae	208
9f95a23c TL	209	return 0;
	210	}
	211
	212	void
	213	vring_invalidate(struct virtio_net dev, struct vhost_virtqueue vq)
	214	{
	215	if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
	216	vhost_user_iotlb_wr_lock(vq);
	217
	218	vq->access_ok = 0;
	219	vq->desc = NULL;
	220	vq->avail = NULL;
	221	vq->used = NULL;
	222
	223	if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
	224	vhost_user_iotlb_wr_unlock(vq);
7c673cae FG	225	}
	226
	227	static void
9f95a23c	228	init_vring_queue(struct virtio_net *dev, uint32_t vring_idx)
7c673cae	229	{
9f95a23c TL	230	struct vhost_virtqueue *vq;
	231
	232	if (vring_idx >= VHOST_MAX_VRING) {
	233	RTE_LOG(ERR, VHOST_CONFIG,
	234	"Failed not init vring, out of bound (%d)\n",
	235	vring_idx);
	236	return;
	237	}
	238
	239	vq = dev->virtqueue[vring_idx];
	240
7c673cae FG	241	memset(vq, 0, sizeof(struct vhost_virtqueue));
	242
	243	vq->kickfd = VIRTIO_UNINITIALIZED_EVENTFD;
	244	vq->callfd = VIRTIO_UNINITIALIZED_EVENTFD;
	245
9f95a23c	246	vhost_user_iotlb_init(dev, vring_idx);
7c673cae FG	247	/* Backends are set to -1 indicating an inactive device. */
	248	vq->backend = -1;
	249
7c673cae FG	250	TAILQ_INIT(&vq->zmbuf_list);
	251	}
	252
	253	static void
9f95a23c	254	reset_vring_queue(struct virtio_net *dev, uint32_t vring_idx)
7c673cae	255	{
9f95a23c	256	struct vhost_virtqueue *vq;
7c673cae FG	257	int callfd;
7c673cae FG	258
9f95a23c TL	259	if (vring_idx >= VHOST_MAX_VRING) {
	260	RTE_LOG(ERR, VHOST_CONFIG,
	261	"Failed not init vring, out of bound (%d)\n",
	262	vring_idx);
	263	return;
	264	}
	265
	266	vq = dev->virtqueue[vring_idx];
7c673cae	267	callfd = vq->callfd;
9f95a23c	268	init_vring_queue(dev, vring_idx);
7c673cae FG	269	vq->callfd = callfd;
	270	}
	271
7c673cae	272	int
11fdf7f2	273	alloc_vring_queue(struct virtio_net *dev, uint32_t vring_idx)
7c673cae	274	{
11fdf7f2	275	struct vhost_virtqueue *vq;
7c673cae	276
11fdf7f2 TL	277	vq = rte_malloc(NULL, sizeof(struct vhost_virtqueue), 0);
11fdf7f2 TL	278	if (vq == NULL) {
7c673cae	279	RTE_LOG(ERR, VHOST_CONFIG,
11fdf7f2	280	"Failed to allocate memory for vring:%u.\n", vring_idx);
7c673cae FG	281	return -1;
	282	}
	283
11fdf7f2	284	dev->virtqueue[vring_idx] = vq;
9f95a23c TL	285	init_vring_queue(dev, vring_idx);
	286	rte_spinlock_init(&vq->access_lock);
	287	vq->avail_wrap_counter = 1;
	288	vq->used_wrap_counter = 1;
	289	vq->signalled_used_valid = false;
7c673cae	290
11fdf7f2	291	dev->nr_vring += 1;
7c673cae FG	292
	293	return 0;
	294	}
	295
	296	/*
	297	* Reset some variables in device structure, while keeping few
11fdf7f2	298	* others untouched, such as vid, ifname, nr_vring: they
7c673cae FG	299	* should be same unless the device is removed.
	300	*/
	301	void
	302	reset_device(struct virtio_net *dev)
	303	{
	304	uint32_t i;
	305
	306	dev->features = 0;
	307	dev->protocol_features = 0;
9f95a23c	308	dev->flags &= VIRTIO_DEV_BUILTIN_VIRTIO_NET;
7c673cae	309
11fdf7f2	310	for (i = 0; i < dev->nr_vring; i++)
9f95a23c	311	reset_vring_queue(dev, i);
7c673cae FG	312	}
	313
	314	/*
	315	* Invoked when there is a new vhost-user connection established (when
	316	* there is a new virtio device being attached).
	317	*/
	318	int
	319	vhost_new_device(void)
	320	{
	321	struct virtio_net *dev;
	322	int i;
	323
7c673cae FG	324	for (i = 0; i < MAX_VHOST_DEVICE; i++) {
	325	if (vhost_devices[i] == NULL)
	326	break;
	327	}
9f95a23c	328
7c673cae FG	329	if (i == MAX_VHOST_DEVICE) {
	330	RTE_LOG(ERR, VHOST_CONFIG,
	331	"Failed to find a free slot for new device.\n");
9f95a23c TL	332	return -1;
	333	}
	334
	335	dev = rte_zmalloc(NULL, sizeof(struct virtio_net), 0);
	336	if (dev == NULL) {
	337	RTE_LOG(ERR, VHOST_CONFIG,
	338	"Failed to allocate memory for new dev.\n");
7c673cae FG	339	return -1;
	340	}
	341
	342	vhost_devices[i] = dev;
	343	dev->vid = i;
9f95a23c TL	344	dev->flags = VIRTIO_DEV_BUILTIN_VIRTIO_NET;
	345	dev->slave_req_fd = -1;
	346	dev->vdpa_dev_id = -1;
	347	dev->postcopy_ufd = -1;
	348	rte_spinlock_init(&dev->slave_req_lock);
7c673cae FG	349
	350	return i;
	351	}
	352
9f95a23c TL	353	void
	354	vhost_destroy_device_notify(struct virtio_net *dev)
	355	{
	356	struct rte_vdpa_device *vdpa_dev;
	357	int did;
	358
	359	if (dev->flags & VIRTIO_DEV_RUNNING) {
	360	did = dev->vdpa_dev_id;
	361	vdpa_dev = rte_vdpa_get_device(did);
	362	if (vdpa_dev && vdpa_dev->ops->dev_close)
	363	vdpa_dev->ops->dev_close(dev->vid);
	364	dev->flags &= ~VIRTIO_DEV_RUNNING;
	365	dev->notify_ops->destroy_device(dev->vid);
	366	}
	367	}
	368
7c673cae FG	369	/*
	370	* Invoked when there is the vhost-user connection is broken (when
	371	* the virtio device is being detached).
	372	*/
	373	void
	374	vhost_destroy_device(int vid)
	375	{
	376	struct virtio_net *dev = get_device(vid);
	377
	378	if (dev == NULL)
	379	return;
	380
9f95a23c	381	vhost_destroy_device_notify(dev);
7c673cae FG	382
	383	cleanup_device(dev, 1);
	384	free_device(dev);
	385
	386	vhost_devices[vid] = NULL;
	387	}
	388
9f95a23c TL	389	void
	390	vhost_attach_vdpa_device(int vid, int did)
	391	{
	392	struct virtio_net *dev = get_device(vid);
	393
	394	if (dev == NULL)
	395	return;
	396
	397	if (rte_vdpa_get_device(did) == NULL)
	398	return;
	399
	400	dev->vdpa_dev_id = did;
	401	}
	402
7c673cae FG	403	void
	404	vhost_set_ifname(int vid, const char *if_name, unsigned int if_len)
	405	{
	406	struct virtio_net *dev;
	407	unsigned int len;
	408
	409	dev = get_device(vid);
	410	if (dev == NULL)
	411	return;
	412
	413	len = if_len > sizeof(dev->ifname) ?
	414	sizeof(dev->ifname) : if_len;
	415
	416	strncpy(dev->ifname, if_name, len);
	417	dev->ifname[sizeof(dev->ifname) - 1] = '\0';
	418	}
	419
	420	void
	421	vhost_enable_dequeue_zero_copy(int vid)
	422	{
	423	struct virtio_net *dev = get_device(vid);
	424
	425	if (dev == NULL)
	426	return;
	427
	428	dev->dequeue_zero_copy = 1;
	429	}
	430
9f95a23c TL	431	void
	432	vhost_set_builtin_virtio_net(int vid, bool enable)
	433	{
	434	struct virtio_net *dev = get_device(vid);
	435
	436	if (dev == NULL)
	437	return;
	438
	439	if (enable)
	440	dev->flags \|= VIRTIO_DEV_BUILTIN_VIRTIO_NET;
	441	else
	442	dev->flags &= ~VIRTIO_DEV_BUILTIN_VIRTIO_NET;
	443	}
	444
11fdf7f2 TL	445	int
	446	rte_vhost_get_mtu(int vid, uint16_t *mtu)
	447	{
	448	struct virtio_net *dev = get_device(vid);
	449
9f95a23c	450	if (dev == NULL \|\| mtu == NULL)
11fdf7f2 TL	451	return -ENODEV;
	452
	453	if (!(dev->flags & VIRTIO_DEV_READY))
	454	return -EAGAIN;
	455
9f95a23c	456	if (!(dev->features & (1ULL << VIRTIO_NET_F_MTU)))
11fdf7f2 TL	457	return -ENOTSUP;
	458
	459	*mtu = dev->mtu;
	460
	461	return 0;
	462	}
	463
7c673cae FG	464	int
	465	rte_vhost_get_numa_node(int vid)
	466	{
	467	#ifdef RTE_LIBRTE_VHOST_NUMA
	468	struct virtio_net *dev = get_device(vid);
	469	int numa_node;
	470	int ret;
	471
9f95a23c	472	if (dev == NULL \|\| numa_available() != 0)
7c673cae FG	473	return -1;
	474
	475	ret = get_mempolicy(&numa_node, NULL, 0, dev,
	476	MPOL_F_NODE \| MPOL_F_ADDR);
	477	if (ret < 0) {
	478	RTE_LOG(ERR, VHOST_CONFIG,
9f95a23c TL	479	"(%d) failed to query numa node: %s\n",
9f95a23c TL	480	vid, rte_strerror(errno));
7c673cae FG	481	return -1;
	482	}
	483
	484	return numa_node;
	485	#else
	486	RTE_SET_USED(vid);
	487	return -1;
	488	#endif
	489	}
	490
	491	uint32_t
	492	rte_vhost_get_queue_num(int vid)
	493	{
	494	struct virtio_net *dev = get_device(vid);
	495
	496	if (dev == NULL)
	497	return 0;
	498
11fdf7f2 TL	499	return dev->nr_vring / 2;
	500	}
	501
	502	uint16_t
	503	rte_vhost_get_vring_num(int vid)
	504	{
	505	struct virtio_net *dev = get_device(vid);
	506
	507	if (dev == NULL)
	508	return 0;
	509
	510	return dev->nr_vring;
7c673cae FG	511	}
	512
	513	int
	514	rte_vhost_get_ifname(int vid, char *buf, size_t len)
	515	{
	516	struct virtio_net *dev = get_device(vid);
	517
9f95a23c	518	if (dev == NULL \|\| buf == NULL)
7c673cae FG	519	return -1;
	520
	521	len = RTE_MIN(len, sizeof(dev->ifname));
	522
	523	strncpy(buf, dev->ifname, len);
	524	buf[len - 1] = '\0';
	525
	526	return 0;
	527	}
	528
11fdf7f2 TL	529	int
	530	rte_vhost_get_negotiated_features(int vid, uint64_t *features)
	531	{
	532	struct virtio_net *dev;
	533
	534	dev = get_device(vid);
9f95a23c	535	if (dev == NULL \|\| features == NULL)
11fdf7f2 TL	536	return -1;
	537
	538	*features = dev->features;
	539	return 0;
	540	}
	541
	542	int
	543	rte_vhost_get_mem_table(int vid, struct rte_vhost_memory **mem)
	544	{
	545	struct virtio_net *dev;
	546	struct rte_vhost_memory *m;
	547	size_t size;
	548
	549	dev = get_device(vid);
9f95a23c	550	if (dev == NULL \|\| mem == NULL)
11fdf7f2 TL	551	return -1;
	552
	553	size = dev->mem->nregions * sizeof(struct rte_vhost_mem_region);
9f95a23c	554	m = malloc(sizeof(struct rte_vhost_memory) + size);
11fdf7f2 TL	555	if (!m)
	556	return -1;
	557
	558	m->nregions = dev->mem->nregions;
	559	memcpy(m->regions, dev->mem->regions, size);
	560	*mem = m;
	561
	562	return 0;
	563	}
	564
	565	int
	566	rte_vhost_get_vhost_vring(int vid, uint16_t vring_idx,
	567	struct rte_vhost_vring *vring)
	568	{
	569	struct virtio_net *dev;
	570	struct vhost_virtqueue *vq;
	571
	572	dev = get_device(vid);
9f95a23c	573	if (dev == NULL \|\| vring == NULL)
11fdf7f2 TL	574	return -1;
	575
	576	if (vring_idx >= VHOST_MAX_VRING)
	577	return -1;
	578
	579	vq = dev->virtqueue[vring_idx];
	580	if (!vq)
	581	return -1;
	582
	583	vring->desc = vq->desc;
	584	vring->avail = vq->avail;
	585	vring->used = vq->used;
	586	vring->log_guest_addr = vq->log_guest_addr;
	587
	588	vring->callfd = vq->callfd;
	589	vring->kickfd = vq->kickfd;
	590	vring->size = vq->size;
	591
	592	return 0;
	593	}
	594
9f95a23c TL	595	int
	596	rte_vhost_vring_call(int vid, uint16_t vring_idx)
	597	{
	598	struct virtio_net *dev;
	599	struct vhost_virtqueue *vq;
	600
	601	dev = get_device(vid);
	602	if (!dev)
	603	return -1;
	604
	605	if (vring_idx >= VHOST_MAX_VRING)
	606	return -1;
	607
	608	vq = dev->virtqueue[vring_idx];
	609	if (!vq)
	610	return -1;
	611
	612	if (vq_is_packed(dev))
	613	vhost_vring_call_packed(dev, vq);
	614	else
	615	vhost_vring_call_split(dev, vq);
	616
	617	return 0;
	618	}
	619
7c673cae FG	620	uint16_t
	621	rte_vhost_avail_entries(int vid, uint16_t queue_id)
	622	{
	623	struct virtio_net *dev;
	624	struct vhost_virtqueue *vq;
	625
	626	dev = get_device(vid);
	627	if (!dev)
	628	return 0;
	629
	630	vq = dev->virtqueue[queue_id];
	631	if (!vq->enabled)
	632	return 0;
	633
	634	return (volatile uint16_t )&vq->avail->idx - vq->last_used_idx;
	635	}
	636
9f95a23c TL	637	static inline void
	638	vhost_enable_notify_split(struct virtio_net *dev,
	639	struct vhost_virtqueue *vq, int enable)
	640	{
	641	if (!(dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))) {
	642	if (enable)
	643	vq->used->flags &= ~VRING_USED_F_NO_NOTIFY;
	644	else
	645	vq->used->flags \|= VRING_USED_F_NO_NOTIFY;
	646	} else {
	647	if (enable)
	648	vhost_avail_event(vq) = vq->last_avail_idx;
	649	}
	650	}
	651
	652	static inline void
	653	vhost_enable_notify_packed(struct virtio_net *dev,
	654	struct vhost_virtqueue *vq, int enable)
	655	{
	656	uint16_t flags;
	657
	658	if (!enable) {
	659	vq->device_event->flags = VRING_EVENT_F_DISABLE;
	660	return;
	661	}
	662
	663	flags = VRING_EVENT_F_ENABLE;
	664	if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX)) {
	665	flags = VRING_EVENT_F_DESC;
	666	vq->device_event->off_wrap = vq->last_avail_idx \|
	667	vq->avail_wrap_counter << 15;
	668	}
	669
	670	rte_smp_wmb();
	671
	672	vq->device_event->flags = flags;
	673	}
	674
7c673cae FG	675	int
	676	rte_vhost_enable_guest_notification(int vid, uint16_t queue_id, int enable)
	677	{
	678	struct virtio_net *dev = get_device(vid);
9f95a23c	679	struct vhost_virtqueue *vq;
7c673cae	680
9f95a23c	681	if (!dev)
7c673cae FG	682	return -1;
7c673cae FG	683
9f95a23c TL	684	vq = dev->virtqueue[queue_id];
	685
	686	if (vq_is_packed(dev))
	687	vhost_enable_notify_packed(dev, vq, enable);
	688	else
	689	vhost_enable_notify_split(dev, vq, enable);
7c673cae	690
7c673cae FG	691	return 0;
	692	}
	693
11fdf7f2 TL	694	void
11fdf7f2 TL	695	rte_vhost_log_write(int vid, uint64_t addr, uint64_t len)
7c673cae	696	{
11fdf7f2	697	struct virtio_net *dev = get_device(vid);
7c673cae	698
11fdf7f2 TL	699	if (dev == NULL)
11fdf7f2 TL	700	return;
7c673cae	701
11fdf7f2	702	vhost_log_write(dev, addr, len);
7c673cae FG	703	}
7c673cae FG	704
11fdf7f2 TL	705	void
	706	rte_vhost_log_used_vring(int vid, uint16_t vring_idx,
	707	uint64_t offset, uint64_t len)
7c673cae	708	{
11fdf7f2 TL	709	struct virtio_net *dev;
11fdf7f2 TL	710	struct vhost_virtqueue *vq;
7c673cae	711
11fdf7f2 TL	712	dev = get_device(vid);
	713	if (dev == NULL)
	714	return;
	715
	716	if (vring_idx >= VHOST_MAX_VRING)
	717	return;
	718	vq = dev->virtqueue[vring_idx];
	719	if (!vq)
	720	return;
	721
	722	vhost_log_used_vring(dev, vq, offset, len);
7c673cae	723	}
9f95a23c TL	724
	725	uint32_t
	726	rte_vhost_rx_queue_count(int vid, uint16_t qid)
	727	{
	728	struct virtio_net *dev;
	729	struct vhost_virtqueue *vq;
	730
	731	dev = get_device(vid);
	732	if (dev == NULL)
	733	return 0;
	734
	735	if (unlikely(qid >= dev->nr_vring \|\| (qid & 1) == 0)) {
	736	RTE_LOG(ERR, VHOST_DATA, "(%d) %s: invalid virtqueue idx %d.\n",
	737	dev->vid, __func__, qid);
	738	return 0;
	739	}
	740
	741	vq = dev->virtqueue[qid];
	742	if (vq == NULL)
	743	return 0;
	744
	745	if (unlikely(vq->enabled == 0 \|\| vq->avail == NULL))
	746	return 0;
	747
	748	return ((volatile uint16_t )&vq->avail->idx) - vq->last_avail_idx;
	749	}
	750
	751	int rte_vhost_get_vdpa_device_id(int vid)
	752	{
	753	struct virtio_net *dev = get_device(vid);
	754
	755	if (dev == NULL)
	756	return -1;
	757
	758	return dev->vdpa_dev_id;
	759	}
	760
	761	int rte_vhost_get_log_base(int vid, uint64_t *log_base,
	762	uint64_t *log_size)
	763	{
	764	struct virtio_net *dev = get_device(vid);
	765
	766	if (dev == NULL \|\| log_base == NULL \|\| log_size == NULL)
	767	return -1;
	768
	769	*log_base = dev->log_base;
	770	*log_size = dev->log_size;
	771
	772	return 0;
	773	}
	774
	775	int rte_vhost_get_vring_base(int vid, uint16_t queue_id,
	776	uint16_t last_avail_idx, uint16_t last_used_idx)
	777	{
	778	struct virtio_net *dev = get_device(vid);
	779
	780	if (dev == NULL \|\| last_avail_idx == NULL \|\| last_used_idx == NULL)
	781	return -1;
	782
	783	*last_avail_idx = dev->virtqueue[queue_id]->last_avail_idx;
	784	*last_used_idx = dev->virtqueue[queue_id]->last_used_idx;
	785
	786	return 0;
	787	}
788
789	int rte_vhost_set_vring_base(int vid, uint16_t queue_id,
790	uint16_t last_avail_idx, uint16_t last_used_idx)
791	{
792	struct virtio_net *dev = get_device(vid);
793
794	if (!dev)
795	return -1;
796
797	dev->virtqueue[queue_id]->last_avail_idx = last_avail_idx;
798	dev->virtqueue[queue_id]->last_used_idx = last_used_idx;
799
800	return 0;
801	}
802
803	int rte_vhost_extern_callback_register(int vid,
804	struct rte_vhost_user_extern_ops const * const ops, void *ctx)
805	{
806	struct virtio_net *dev = get_device(vid);
807
808	if (dev == NULL \|\| ops == NULL)
809	return -1;
810
811	dev->extern_ops = *ops;
812	dev->extern_data = ctx;
813	return 0;
814	}