[ceph.git] / ceph / src / spdk / lib / vhost / rte_vhost / vhost.c

/*-
 *   BSD LICENSE
 *
 *   Copyright(c) 2010-2016 Intel Corporation. All rights reserved.
 *   All rights reserved.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions
 *   are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *     * Neither the name of Intel Corporation nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

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

#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 "vhost.h"

struct virtio_net *vhost_devices[MAX_VHOST_DEVICE];

struct virtio_net *
get_device(int vid)
{
	struct virtio_net *dev = vhost_devices[vid];

	if (unlikely(!dev)) {
		RTE_LOG(ERR, VHOST_CONFIG,
			"(%d) device not found.\n", vid);
	}

	return dev;
}

static 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);
}

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

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

		rte_free(vq->shadow_used_ring);

		rte_free(vq);
	}

	rte_free(dev);
}

static void
init_vring_queue(struct vhost_virtqueue *vq)
{
	memset(vq, 0, sizeof(struct vhost_virtqueue));

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

	/* Backends are set to -1 indicating an inactive device. */
	vq->backend = -1;

	/*
	 * always set the vq to enabled; this is to keep compatibility
	 * with the old QEMU, whereas there is no SET_VRING_ENABLE message.
	 */
	vq->enabled = 1;

	TAILQ_INIT(&vq->zmbuf_list);
}

static void
reset_vring_queue(struct vhost_virtqueue *vq)
{
	int callfd;

	callfd = vq->callfd;
	init_vring_queue(vq);
	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(vq);

	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->negotiated_features = 0;
	dev->protocol_features = 0;
	dev->flags = 0;

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

/*
 * Invoked when there is a new vhost-user connection established (when
 * there is a new virtio device being attached).
 */
int
vhost_new_device(uint64_t features, struct vhost_device_ops const *ops)
{
	struct virtio_net *dev;
	int i;

	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;
	}

	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");
		rte_free(dev);
		return -1;
	}

	vhost_devices[i] = dev;
	dev->vid = i;
	dev->features = features;
	dev->notify_ops = ops;

	return i;
}

/*
 * 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;

	if (dev->flags & VIRTIO_DEV_RUNNING) {
		dev->flags &= ~VIRTIO_DEV_RUNNING;
		dev->notify_ops->destroy_device(vid);
	}

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

	vhost_devices[vid] = NULL;
}

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;
}

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

	if (!dev)
		return -ENODEV;

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

	if (!(dev->negotiated_features & 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)
		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: %d\n", vid, ret);
		return -1;
	}

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

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

	if (dev == 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)
		return -1;

	*features = dev->negotiated_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)
		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)
		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;
}

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;
}

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

	if (dev == NULL)
		return -1;

	if (enable) {
		RTE_LOG(ERR, VHOST_CONFIG,
			"guest notification isn't supported.\n");
		return -1;
	}

	dev->virtqueue[queue_id]->used->flags = VRING_USED_F_NO_NOTIFY;
	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);
}

int
rte_vhost_set_vring_base(int vid, uint16_t vring_idx,
		uint16_t last_avail_idx, uint16_t last_used_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;

	vq->last_avail_idx = last_avail_idx;
	vq->last_used_idx = last_used_idx;

	return 0;
}

int
rte_vhost_get_vring_base(int vid, uint16_t vring_idx,
		uint16_t *last_avail_idx, uint16_t *last_used_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;

	*last_avail_idx = vq->last_avail_idx;
	*last_used_idx = vq->last_used_idx;

	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->callfd != -1) {
		eventfd_write(vq->callfd, (eventfd_t)1);
		return 0;
	}

	return -1;
}
Commit	Line	Data
7c673cae FG	1	/*-
	2	* BSD LICENSE
	3	*
	4	* Copyright(c) 2010-2016 Intel Corporation. All rights reserved.
	5	* All rights reserved.
	6	*
	7	* Redistribution and use in source and binary forms, with or without
	8	* modification, are permitted provided that the following conditions
	9	* are met:
	10	*
	11	* * Redistributions of source code must retain the above copyright
	12	* notice, this list of conditions and the following disclaimer.
	13	* * Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in
	15	* the documentation and/or other materials provided with the
	16	* distribution.
	17	* * Neither the name of Intel Corporation nor the names of its
	18	* contributors may be used to endorse or promote products derived
	19	* from this software without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	22	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	23	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	24	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	25	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	26	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	27	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	28	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	29	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	30	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	31	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	32	*/
	33
	34	#include <linux/vhost.h>
	35	#include <linux/virtio_net.h>
	36	#include <stddef.h>
	37	#include <stdint.h>
	38	#include <stdlib.h>
	39	#ifdef RTE_LIBRTE_VHOST_NUMA
	40	#include <numaif.h>
	41	#endif
	42
	43	#include <rte_ethdev.h>
	44	#include <rte_log.h>
	45	#include <rte_string_fns.h>
	46	#include <rte_memory.h>
	47	#include <rte_malloc.h>
11fdf7f2	48	#include <rte_vhost.h>
7c673cae FG	49
	50	#include "vhost.h"
	51
7c673cae FG	52	struct virtio_net *vhost_devices[MAX_VHOST_DEVICE];
7c673cae FG	53
7c673cae FG	54	struct virtio_net *
	55	get_device(int vid)
	56	{
	57	struct virtio_net *dev = vhost_devices[vid];
	58
	59	if (unlikely(!dev)) {
	60	RTE_LOG(ERR, VHOST_CONFIG,
	61	"(%d) device not found.\n", vid);
	62	}
	63
	64	return dev;
	65	}
	66
	67	static void
	68	cleanup_vq(struct vhost_virtqueue *vq, int destroy)
	69	{
	70	if ((vq->callfd >= 0) && (destroy != 0))
	71	close(vq->callfd);
	72	if (vq->kickfd >= 0)
	73	close(vq->kickfd);
	74	}
	75
	76	/*
	77	* Unmap any memory, close any file descriptors and
	78	* free any memory owned by a device.
	79	*/
	80	void
	81	cleanup_device(struct virtio_net *dev, int destroy)
	82	{
	83	uint32_t i;
	84
	85	vhost_backend_cleanup(dev);
	86
11fdf7f2 TL	87	for (i = 0; i < dev->nr_vring; i++)
11fdf7f2 TL	88	cleanup_vq(dev->virtqueue[i], destroy);
7c673cae FG	89	}
	90
	91	/*
	92	* Release virtqueues and device memory.
	93	*/
	94	static void
	95	free_device(struct virtio_net *dev)
	96	{
	97	uint32_t i;
11fdf7f2	98	struct vhost_virtqueue *vq;
7c673cae	99
11fdf7f2 TL	100	for (i = 0; i < dev->nr_vring; i++) {
11fdf7f2 TL	101	vq = dev->virtqueue[i];
7c673cae	102
11fdf7f2	103	rte_free(vq->shadow_used_ring);
7c673cae	104
11fdf7f2	105	rte_free(vq);
7c673cae FG	106	}
	107
	108	rte_free(dev);
	109	}
	110
	111	static void
11fdf7f2	112	init_vring_queue(struct vhost_virtqueue *vq)
7c673cae FG	113	{
	114	memset(vq, 0, sizeof(struct vhost_virtqueue));
	115
	116	vq->kickfd = VIRTIO_UNINITIALIZED_EVENTFD;
	117	vq->callfd = VIRTIO_UNINITIALIZED_EVENTFD;
	118
	119	/* Backends are set to -1 indicating an inactive device. */
	120	vq->backend = -1;
	121
11fdf7f2 TL	122	/*
	123	* always set the vq to enabled; this is to keep compatibility
	124	* with the old QEMU, whereas there is no SET_VRING_ENABLE message.
	125	*/
	126	vq->enabled = 1;
7c673cae FG	127
	128	TAILQ_INIT(&vq->zmbuf_list);
	129	}
	130
	131	static void
11fdf7f2	132	reset_vring_queue(struct vhost_virtqueue *vq)
7c673cae FG	133	{
	134	int callfd;
	135
	136	callfd = vq->callfd;
11fdf7f2	137	init_vring_queue(vq);
7c673cae FG	138	vq->callfd = callfd;
	139	}
	140
7c673cae	141	int
11fdf7f2	142	alloc_vring_queue(struct virtio_net *dev, uint32_t vring_idx)
7c673cae	143	{
11fdf7f2	144	struct vhost_virtqueue *vq;
7c673cae	145
11fdf7f2 TL	146	vq = rte_malloc(NULL, sizeof(struct vhost_virtqueue), 0);
11fdf7f2 TL	147	if (vq == NULL) {
7c673cae	148	RTE_LOG(ERR, VHOST_CONFIG,
11fdf7f2	149	"Failed to allocate memory for vring:%u.\n", vring_idx);
7c673cae FG	150	return -1;
	151	}
	152
11fdf7f2 TL	153	dev->virtqueue[vring_idx] = vq;
11fdf7f2 TL	154	init_vring_queue(vq);
7c673cae	155
11fdf7f2	156	dev->nr_vring += 1;
7c673cae FG	157
	158	return 0;
	159	}
	160
	161	/*
	162	* Reset some variables in device structure, while keeping few
11fdf7f2	163	* others untouched, such as vid, ifname, nr_vring: they
7c673cae FG	164	* should be same unless the device is removed.
	165	*/
	166	void
	167	reset_device(struct virtio_net *dev)
	168	{
	169	uint32_t i;
	170
11fdf7f2	171	dev->negotiated_features = 0;
7c673cae FG	172	dev->protocol_features = 0;
	173	dev->flags = 0;
	174
11fdf7f2 TL	175	for (i = 0; i < dev->nr_vring; i++)
11fdf7f2 TL	176	reset_vring_queue(dev->virtqueue[i]);
7c673cae FG	177	}
	178
	179	/*
	180	* Invoked when there is a new vhost-user connection established (when
	181	* there is a new virtio device being attached).
	182	*/
	183	int
9f95a23c	184	vhost_new_device(uint64_t features, struct vhost_device_ops const *ops)
7c673cae FG	185	{
	186	struct virtio_net *dev;
	187	int i;
	188
	189	dev = rte_zmalloc(NULL, sizeof(struct virtio_net), 0);
	190	if (dev == NULL) {
	191	RTE_LOG(ERR, VHOST_CONFIG,
	192	"Failed to allocate memory for new dev.\n");
	193	return -1;
	194	}
	195
	196	for (i = 0; i < MAX_VHOST_DEVICE; i++) {
	197	if (vhost_devices[i] == NULL)
	198	break;
	199	}
	200	if (i == MAX_VHOST_DEVICE) {
	201	RTE_LOG(ERR, VHOST_CONFIG,
	202	"Failed to find a free slot for new device.\n");
11fdf7f2	203	rte_free(dev);
7c673cae FG	204	return -1;
	205	}
	206
	207	vhost_devices[i] = dev;
	208	dev->vid = i;
11fdf7f2	209	dev->features = features;
9f95a23c	210	dev->notify_ops = ops;
7c673cae FG	211
	212	return i;
	213	}
	214
	215	/*
	216	* Invoked when there is the vhost-user connection is broken (when
	217	* the virtio device is being detached).
	218	*/
	219	void
	220	vhost_destroy_device(int vid)
	221	{
	222	struct virtio_net *dev = get_device(vid);
	223
	224	if (dev == NULL)
	225	return;
	226
	227	if (dev->flags & VIRTIO_DEV_RUNNING) {
	228	dev->flags &= ~VIRTIO_DEV_RUNNING;
11fdf7f2	229	dev->notify_ops->destroy_device(vid);
7c673cae FG	230	}
	231
	232	cleanup_device(dev, 1);
	233	free_device(dev);
	234
	235	vhost_devices[vid] = NULL;
	236	}
	237
	238	void
	239	vhost_set_ifname(int vid, const char *if_name, unsigned int if_len)
	240	{
	241	struct virtio_net *dev;
	242	unsigned int len;
	243
	244	dev = get_device(vid);
	245	if (dev == NULL)
	246	return;
	247
	248	len = if_len > sizeof(dev->ifname) ?
	249	sizeof(dev->ifname) : if_len;
	250
	251	strncpy(dev->ifname, if_name, len);
	252	dev->ifname[sizeof(dev->ifname) - 1] = '\0';
	253	}
	254
	255	void
	256	vhost_enable_dequeue_zero_copy(int vid)
	257	{
	258	struct virtio_net *dev = get_device(vid);
	259
	260	if (dev == NULL)
	261	return;
	262
	263	dev->dequeue_zero_copy = 1;
	264	}
	265
11fdf7f2 TL	266	int
	267	rte_vhost_get_mtu(int vid, uint16_t *mtu)
	268	{
	269	struct virtio_net *dev = get_device(vid);
	270
	271	if (!dev)
	272	return -ENODEV;
	273
	274	if (!(dev->flags & VIRTIO_DEV_READY))
	275	return -EAGAIN;
	276
	277	if (!(dev->negotiated_features & VIRTIO_NET_F_MTU))
	278	return -ENOTSUP;
	279
	280	*mtu = dev->mtu;
	281
	282	return 0;
	283	}
	284
7c673cae FG	285	int
	286	rte_vhost_get_numa_node(int vid)
	287	{
	288	#ifdef RTE_LIBRTE_VHOST_NUMA
	289	struct virtio_net *dev = get_device(vid);
	290	int numa_node;
	291	int ret;
	292
	293	if (dev == NULL)
	294	return -1;
	295
	296	ret = get_mempolicy(&numa_node, NULL, 0, dev,
	297	MPOL_F_NODE \| MPOL_F_ADDR);
	298	if (ret < 0) {
	299	RTE_LOG(ERR, VHOST_CONFIG,
	300	"(%d) failed to query numa node: %d\n", vid, ret);
	301	return -1;
	302	}
	303
	304	return numa_node;
	305	#else
	306	RTE_SET_USED(vid);
	307	return -1;
	308	#endif
	309	}
	310
11fdf7f2 TL	311	int
11fdf7f2 TL	312	rte_vhost_get_ifname(int vid, char *buf, size_t len)
7c673cae FG	313	{
	314	struct virtio_net *dev = get_device(vid);
	315
	316	if (dev == NULL)
11fdf7f2 TL	317	return -1;
	318
	319	len = RTE_MIN(len, sizeof(dev->ifname));
	320
	321	strncpy(buf, dev->ifname, len);
	322	buf[len - 1] = '\0';
7c673cae	323
11fdf7f2	324	return 0;
7c673cae FG	325	}
	326
	327	int
11fdf7f2	328	rte_vhost_get_negotiated_features(int vid, uint64_t *features)
7c673cae	329	{
11fdf7f2	330	struct virtio_net *dev;
7c673cae	331
11fdf7f2 TL	332	dev = get_device(vid);
11fdf7f2 TL	333	if (!dev)
7c673cae FG	334	return -1;
7c673cae FG	335
11fdf7f2 TL	336	*features = dev->negotiated_features;
	337	return 0;
	338	}
7c673cae	339
11fdf7f2 TL	340	int
	341	rte_vhost_get_mem_table(int vid, struct rte_vhost_memory **mem)
	342	{
	343	struct virtio_net *dev;
	344	struct rte_vhost_memory *m;
	345	size_t size;
	346
	347	dev = get_device(vid);
	348	if (!dev)
	349	return -1;
	350
	351	size = dev->mem->nregions * sizeof(struct rte_vhost_mem_region);
	352	m = malloc(sizeof(struct rte_vhost_memory) + size);
	353	if (!m)
	354	return -1;
	355
	356	m->nregions = dev->mem->nregions;
	357	memcpy(m->regions, dev->mem->regions, size);
	358	*mem = m;
	359
	360	return 0;
	361	}
	362
	363	int
	364	rte_vhost_get_vhost_vring(int vid, uint16_t vring_idx,
	365	struct rte_vhost_vring *vring)
	366	{
	367	struct virtio_net *dev;
	368	struct vhost_virtqueue *vq;
	369
	370	dev = get_device(vid);
	371	if (!dev)
	372	return -1;
	373
	374	if (vring_idx >= VHOST_MAX_VRING)
	375	return -1;
	376
	377	vq = dev->virtqueue[vring_idx];
	378	if (!vq)
	379	return -1;
	380
	381	vring->desc = vq->desc;
	382	vring->avail = vq->avail;
	383	vring->used = vq->used;
	384	vring->log_guest_addr = vq->log_guest_addr;
	385
	386	vring->callfd = vq->callfd;
	387	vring->kickfd = vq->kickfd;
	388	vring->size = vq->size;
	389
7c673cae FG	390	return 0;
	391	}
	392
	393	uint16_t
	394	rte_vhost_avail_entries(int vid, uint16_t queue_id)
	395	{
	396	struct virtio_net *dev;
	397	struct vhost_virtqueue *vq;
	398
	399	dev = get_device(vid);
	400	if (!dev)
	401	return 0;
	402
	403	vq = dev->virtqueue[queue_id];
	404	if (!vq->enabled)
	405	return 0;
	406
	407	return (volatile uint16_t )&vq->avail->idx - vq->last_used_idx;
	408	}
	409
	410	int
	411	rte_vhost_enable_guest_notification(int vid, uint16_t queue_id, int enable)
	412	{
	413	struct virtio_net *dev = get_device(vid);
	414
	415	if (dev == NULL)
	416	return -1;
	417
	418	if (enable) {
	419	RTE_LOG(ERR, VHOST_CONFIG,
	420	"guest notification isn't supported.\n");
	421	return -1;
	422	}
	423
	424	dev->virtqueue[queue_id]->used->flags = VRING_USED_F_NO_NOTIFY;
	425	return 0;
	426	}
	427
11fdf7f2 TL	428	void
11fdf7f2 TL	429	rte_vhost_log_write(int vid, uint64_t addr, uint64_t len)
7c673cae	430	{
11fdf7f2	431	struct virtio_net *dev = get_device(vid);
7c673cae	432
11fdf7f2 TL	433	if (dev == NULL)
	434	return;
	435
	436	vhost_log_write(dev, addr, len);
7c673cae FG	437	}
7c673cae FG	438
11fdf7f2 TL	439	void
	440	rte_vhost_log_used_vring(int vid, uint16_t vring_idx,
	441	uint64_t offset, uint64_t len)
7c673cae	442	{
11fdf7f2 TL	443	struct virtio_net *dev;
	444	struct vhost_virtqueue *vq;
	445
	446	dev = get_device(vid);
	447	if (dev == NULL)
	448	return;
	449
	450	if (vring_idx >= VHOST_MAX_VRING)
	451	return;
	452	vq = dev->virtqueue[vring_idx];
	453	if (!vq)
	454	return;
	455
	456	vhost_log_used_vring(dev, vq, offset, len);
7c673cae FG	457	}
7c673cae FG	458
7c673cae	459	int
9f95a23c TL	460	rte_vhost_set_vring_base(int vid, uint16_t vring_idx,
	461	uint16_t last_avail_idx, uint16_t last_used_idx)
	462	{
11fdf7f2 TL	463	struct virtio_net *dev;
	464	struct vhost_virtqueue *vq;
	465
	466	dev = get_device(vid);
	467	if (!dev)
	468	return -1;
	469
	470	if (vring_idx >= VHOST_MAX_VRING)
	471	return -1;
	472
	473	vq = dev->virtqueue[vring_idx];
	474	if (!vq)
	475	return -1;
	476
	477	vq->last_avail_idx = last_avail_idx;
	478	vq->last_used_idx = last_used_idx;
7c673cae FG	479
	480	return 0;
	481	}
9f95a23c TL	482
	483	int
	484	rte_vhost_get_vring_base(int vid, uint16_t vring_idx,
	485	uint16_t last_avail_idx, uint16_t last_used_idx)
	486	{
	487	struct virtio_net *dev;
	488	struct vhost_virtqueue *vq;
	489
	490	dev = get_device(vid);
	491	if (!dev)
	492	return -1;
	493
	494	if (vring_idx >= VHOST_MAX_VRING)
	495	return -1;
	496
	497	vq = dev->virtqueue[vring_idx];
	498	if (!vq)
	499	return -1;
	500
	501	*last_avail_idx = vq->last_avail_idx;
	502	*last_used_idx = vq->last_used_idx;
	503
	504	return 0;
	505	}
	506
	507	int
	508	rte_vhost_vring_call(int vid, uint16_t vring_idx)
	509	{
	510	struct virtio_net *dev;
	511	struct vhost_virtqueue *vq;
	512
	513	dev = get_device(vid);
	514	if(!dev)
	515	return -1;
	516
	517	if (vring_idx >= VHOST_MAX_VRING)
	518	return -1;
	519
	520	vq = dev->virtqueue[vring_idx];
	521	if (!vq)
	522	return -1;
	523
	524	if (vq->callfd != -1) {
	525	eventfd_write(vq->callfd, (eventfd_t)1);
	526	return 0;
	527	}
	528
	529	return -1;
	530	}