[qemu.git] / hw / net / vhost_net.c

/*
 * vhost-net support
 *
 * Copyright Red Hat, Inc. 2010
 *
 * Authors:
 *  Michael S. Tsirkin <[email protected]>
 *
 * This work is licensed under the terms of the GNU GPL, version 2.  See
 * the COPYING file in the top-level directory.
 *
 * Contributions after 2012-01-13 are licensed under the terms of the
 * GNU GPL, version 2 or (at your option) any later version.
 */

#include "net/net.h"
#include "net/tap.h"
#include "net/vhost-user.h"

#include "hw/virtio/virtio-net.h"
#include "net/vhost_net.h"
#include "qemu/error-report.h"

#include "config.h"

#ifdef CONFIG_VHOST_NET
#include <linux/vhost.h>
#include <sys/socket.h>
#include <linux/kvm.h>
#include <fcntl.h>
#include <netpacket/packet.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <netinet/in.h>

#include <stdio.h>

#include "standard-headers/linux/virtio_ring.h"
#include "hw/virtio/vhost.h"
#include "hw/virtio/virtio-bus.h"

struct vhost_net {
    struct vhost_dev dev;
    struct vhost_virtqueue vqs[2];
    int backend;
    NetClientState *nc;
};

/* Features supported by host kernel. */
static const int kernel_feature_bits[] = {
    VIRTIO_F_NOTIFY_ON_EMPTY,
    VIRTIO_RING_F_INDIRECT_DESC,
    VIRTIO_RING_F_EVENT_IDX,
    VIRTIO_NET_F_MRG_RXBUF,
    VHOST_INVALID_FEATURE_BIT
};

/* Features supported by others. */
const int user_feature_bits[] = {
    VIRTIO_F_NOTIFY_ON_EMPTY,
    VIRTIO_RING_F_INDIRECT_DESC,
    VIRTIO_RING_F_EVENT_IDX,

    VIRTIO_F_ANY_LAYOUT,
    VIRTIO_NET_F_CSUM,
    VIRTIO_NET_F_GUEST_CSUM,
    VIRTIO_NET_F_GSO,
    VIRTIO_NET_F_GUEST_TSO4,
    VIRTIO_NET_F_GUEST_TSO6,
    VIRTIO_NET_F_GUEST_ECN,
    VIRTIO_NET_F_GUEST_UFO,
    VIRTIO_NET_F_HOST_TSO4,
    VIRTIO_NET_F_HOST_TSO6,
    VIRTIO_NET_F_HOST_ECN,
    VIRTIO_NET_F_HOST_UFO,
    VIRTIO_NET_F_MRG_RXBUF,
    VIRTIO_NET_F_STATUS,
    VIRTIO_NET_F_CTRL_VQ,
    VIRTIO_NET_F_CTRL_RX,
    VIRTIO_NET_F_CTRL_VLAN,
    VIRTIO_NET_F_CTRL_RX_EXTRA,
    VIRTIO_NET_F_CTRL_MAC_ADDR,
    VIRTIO_NET_F_CTRL_GUEST_OFFLOADS,

    VIRTIO_NET_F_MQ,

    VHOST_INVALID_FEATURE_BIT
};

static const int *vhost_net_get_feature_bits(struct vhost_net *net)
{
    const int *feature_bits = 0;

    switch (net->nc->info->type) {
    case NET_CLIENT_OPTIONS_KIND_TAP:
        feature_bits = kernel_feature_bits;
        break;
    case NET_CLIENT_OPTIONS_KIND_VHOST_USER:
        feature_bits = user_feature_bits;
        break;
    default:
        error_report("Feature bits not defined for this type: %d",
                net->nc->info->type);
        break;
    }

    return feature_bits;
}

unsigned vhost_net_get_features(struct vhost_net *net, unsigned features)
{
    return vhost_get_features(&net->dev, vhost_net_get_feature_bits(net),
            features);
}

void vhost_net_ack_features(struct vhost_net *net, unsigned features)
{
    net->dev.acked_features = net->dev.backend_features;
    vhost_ack_features(&net->dev, vhost_net_get_feature_bits(net), features);
}

static int vhost_net_get_fd(NetClientState *backend)
{
    switch (backend->info->type) {
    case NET_CLIENT_OPTIONS_KIND_TAP:
        return tap_get_fd(backend);
    default:
        fprintf(stderr, "vhost-net requires tap backend\n");
        return -EBADFD;
    }
}

struct vhost_net *vhost_net_init(VhostNetOptions *options)
{
    int r;
    bool backend_kernel = options->backend_type == VHOST_BACKEND_TYPE_KERNEL;
    struct vhost_net *net = g_malloc(sizeof *net);

    if (!options->net_backend) {
        fprintf(stderr, "vhost-net requires net backend to be setup\n");
        goto fail;
    }

    if (backend_kernel) {
        r = vhost_net_get_fd(options->net_backend);
        if (r < 0) {
            goto fail;
        }
        net->dev.backend_features = qemu_has_vnet_hdr(options->net_backend)
            ? 0 : (1 << VHOST_NET_F_VIRTIO_NET_HDR);
        net->backend = r;
    } else {
        net->dev.backend_features = 0;
        net->backend = -1;
    }
    net->nc = options->net_backend;

    net->dev.nvqs = 2;
    net->dev.vqs = net->vqs;

    r = vhost_dev_init(&net->dev, options->opaque,
                       options->backend_type, options->force);
    if (r < 0) {
        goto fail;
    }
    if (backend_kernel) {
        if (!qemu_has_vnet_hdr_len(options->net_backend,
                               sizeof(struct virtio_net_hdr_mrg_rxbuf))) {
            net->dev.features &= ~(1 << VIRTIO_NET_F_MRG_RXBUF);
        }
        if (~net->dev.features & net->dev.backend_features) {
            fprintf(stderr, "vhost lacks feature mask %" PRIu64
                   " for backend\n",
                   (uint64_t)(~net->dev.features & net->dev.backend_features));
            vhost_dev_cleanup(&net->dev);
            goto fail;
        }
    }
    /* Set sane init value. Override when guest acks. */
    vhost_net_ack_features(net, 0);
    return net;
fail:
    g_free(net);
    return NULL;
}

bool vhost_net_query(VHostNetState *net, VirtIODevice *dev)
{
    return vhost_dev_query(&net->dev, dev);
}

static void vhost_net_set_vq_index(struct vhost_net *net, int vq_index)
{
    net->dev.vq_index = vq_index;
}

static int vhost_net_start_one(struct vhost_net *net,
                               VirtIODevice *dev)
{
    struct vhost_vring_file file = { };
    int r;

    net->dev.nvqs = 2;
    net->dev.vqs = net->vqs;

    r = vhost_dev_enable_notifiers(&net->dev, dev);
    if (r < 0) {
        goto fail_notifiers;
    }

    r = vhost_dev_start(&net->dev, dev);
    if (r < 0) {
        goto fail_start;
    }

    if (net->nc->info->poll) {
        net->nc->info->poll(net->nc, false);
    }

    if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP) {
        qemu_set_fd_handler(net->backend, NULL, NULL, NULL);
        file.fd = net->backend;
        for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
            const VhostOps *vhost_ops = net->dev.vhost_ops;
            r = vhost_ops->vhost_call(&net->dev, VHOST_NET_SET_BACKEND,
                                      &file);
            if (r < 0) {
                r = -errno;
                goto fail;
            }
        }
    }
    return 0;
fail:
    file.fd = -1;
    if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP) {
        while (file.index-- > 0) {
            const VhostOps *vhost_ops = net->dev.vhost_ops;
            int r = vhost_ops->vhost_call(&net->dev, VHOST_NET_SET_BACKEND,
                                          &file);
            assert(r >= 0);
        }
    }
    if (net->nc->info->poll) {
        net->nc->info->poll(net->nc, true);
    }
    vhost_dev_stop(&net->dev, dev);
fail_start:
    vhost_dev_disable_notifiers(&net->dev, dev);
fail_notifiers:
    return r;
}

static void vhost_net_stop_one(struct vhost_net *net,
                               VirtIODevice *dev)
{
    struct vhost_vring_file file = { .fd = -1 };

    if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP) {
        for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
            const VhostOps *vhost_ops = net->dev.vhost_ops;
            int r = vhost_ops->vhost_call(&net->dev, VHOST_NET_SET_BACKEND,
                                          &file);
            assert(r >= 0);
        }
    }
    if (net->nc->info->poll) {
        net->nc->info->poll(net->nc, true);
    }
    vhost_dev_stop(&net->dev, dev);
    vhost_dev_disable_notifiers(&net->dev, dev);
}

static bool vhost_net_device_endian_ok(VirtIODevice *vdev)
{
#ifdef TARGET_IS_BIENDIAN
#ifdef HOST_WORDS_BIGENDIAN
    return virtio_is_big_endian(vdev);
#else
    return !virtio_is_big_endian(vdev);
#endif
#else
    return true;
#endif
}

int vhost_net_start(VirtIODevice *dev, NetClientState *ncs,
                    int total_queues)
{
    BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
    VirtioBusState *vbus = VIRTIO_BUS(qbus);
    VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
    int r, e, i;

    if (!vhost_net_device_endian_ok(dev)) {
        error_report("vhost-net does not support cross-endian");
        r = -ENOSYS;
        goto err;
    }

    if (!k->set_guest_notifiers) {
        error_report("binding does not support guest notifiers");
        r = -ENOSYS;
        goto err;
    }

    for (i = 0; i < total_queues; i++) {
        vhost_net_set_vq_index(get_vhost_net(ncs[i].peer), i * 2);
    }

    r = k->set_guest_notifiers(qbus->parent, total_queues * 2, true);
    if (r < 0) {
        error_report("Error binding guest notifier: %d", -r);
        goto err;
    }

    for (i = 0; i < total_queues; i++) {
        r = vhost_net_start_one(get_vhost_net(ncs[i].peer), dev);

        if (r < 0) {
            goto err_start;
        }
    }

    return 0;

err_start:
    while (--i >= 0) {
        vhost_net_stop_one(get_vhost_net(ncs[i].peer), dev);
    }
    e = k->set_guest_notifiers(qbus->parent, total_queues * 2, false);
    if (e < 0) {
        fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", e);
        fflush(stderr);
    }
err:
    return r;
}

void vhost_net_stop(VirtIODevice *dev, NetClientState *ncs,
                    int total_queues)
{
    BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
    VirtioBusState *vbus = VIRTIO_BUS(qbus);
    VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
    int i, r;

    for (i = 0; i < total_queues; i++) {
        vhost_net_stop_one(get_vhost_net(ncs[i].peer), dev);
    }

    r = k->set_guest_notifiers(qbus->parent, total_queues * 2, false);
    if (r < 0) {
        fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", r);
        fflush(stderr);
    }
    assert(r >= 0);
}

void vhost_net_cleanup(struct vhost_net *net)
{
    vhost_dev_cleanup(&net->dev);
    g_free(net);
}

bool vhost_net_virtqueue_pending(VHostNetState *net, int idx)
{
    return vhost_virtqueue_pending(&net->dev, idx);
}

void vhost_net_virtqueue_mask(VHostNetState *net, VirtIODevice *dev,
                              int idx, bool mask)
{
    vhost_virtqueue_mask(&net->dev, dev, idx, mask);
}

VHostNetState *get_vhost_net(NetClientState *nc)
{
    VHostNetState *vhost_net = 0;

    if (!nc) {
        return 0;
    }

    switch (nc->info->type) {
    case NET_CLIENT_OPTIONS_KIND_TAP:
        vhost_net = tap_get_vhost_net(nc);
        break;
    case NET_CLIENT_OPTIONS_KIND_VHOST_USER:
        vhost_net = vhost_user_get_vhost_net(nc);
        break;
    default:
        break;
    }

    return vhost_net;
}
#else
struct vhost_net *vhost_net_init(VhostNetOptions *options)
{
    error_report("vhost-net support is not compiled in");
    return NULL;
}

bool vhost_net_query(VHostNetState *net, VirtIODevice *dev)
{
    return false;
}

int vhost_net_start(VirtIODevice *dev,
                    NetClientState *ncs,
                    int total_queues)
{
    return -ENOSYS;
}
void vhost_net_stop(VirtIODevice *dev,
                    NetClientState *ncs,
                    int total_queues)
{
}

void vhost_net_cleanup(struct vhost_net *net)
{
}

unsigned vhost_net_get_features(struct vhost_net *net, unsigned features)
{
    return features;
}
void vhost_net_ack_features(struct vhost_net *net, unsigned features)
{
}

bool vhost_net_virtqueue_pending(VHostNetState *net, int idx)
{
    return false;
}

void vhost_net_virtqueue_mask(VHostNetState *net, VirtIODevice *dev,
                              int idx, bool mask)
{
}

VHostNetState *get_vhost_net(NetClientState *nc)
{
    return 0;
}
#endif
Commit	Line	Data
d5970055 MT	1	/*
	2	* vhost-net support
	3	*
	4	* Copyright Red Hat, Inc. 2010
	5	*
	6	* Authors:
	7	* Michael S. Tsirkin <[email protected]>
	8	*
	9	* This work is licensed under the terms of the GNU GPL, version 2. See
	10	* the COPYING file in the top-level directory.
6b620ca3 PB	11	*
	12	* Contributions after 2012-01-13 are licensed under the terms of the
	13	* GNU GPL, version 2 or (at your option) any later version.
d5970055 MT	14	*/
d5970055 MT	15
1422e32d	16	#include "net/net.h"
d5970055	17	#include "net/tap.h"
03ce5744	18	#include "net/vhost-user.h"
d5970055	19
0d09e41a PB	20	#include "hw/virtio/virtio-net.h"
0d09e41a PB	21	#include "net/vhost_net.h"
1de7afc9	22	#include "qemu/error-report.h"
d5970055 MT	23
	24	#include "config.h"
	25
	26	#ifdef CONFIG_VHOST_NET
	27	#include <linux/vhost.h>
d5970055 MT	28	#include <sys/socket.h>
	29	#include <linux/kvm.h>
	30	#include <fcntl.h>
d5970055 MT	31	#include <netpacket/packet.h>
	32	#include <net/ethernet.h>
	33	#include <net/if.h>
	34	#include <netinet/in.h>
	35
	36	#include <stdio.h>
	37
4fbe0f32	38	#include "standard-headers/linux/virtio_ring.h"
0d09e41a	39	#include "hw/virtio/vhost.h"
1c819449	40	#include "hw/virtio/virtio-bus.h"
d5970055 MT	41
	42	struct vhost_net {
	43	struct vhost_dev dev;
	44	struct vhost_virtqueue vqs[2];
	45	int backend;
35277d14	46	NetClientState *nc;
d5970055 MT	47	};
d5970055 MT	48
2e6d46d7 NN	49	/* Features supported by host kernel. */
	50	static const int kernel_feature_bits[] = {
	51	VIRTIO_F_NOTIFY_ON_EMPTY,
	52	VIRTIO_RING_F_INDIRECT_DESC,
	53	VIRTIO_RING_F_EVENT_IDX,
	54	VIRTIO_NET_F_MRG_RXBUF,
	55	VHOST_INVALID_FEATURE_BIT
	56	};
	57
5f4c01ca NN	58	/* Features supported by others. */
	59	const int user_feature_bits[] = {
	60	VIRTIO_F_NOTIFY_ON_EMPTY,
	61	VIRTIO_RING_F_INDIRECT_DESC,
	62	VIRTIO_RING_F_EVENT_IDX,
	63
	64	VIRTIO_F_ANY_LAYOUT,
	65	VIRTIO_NET_F_CSUM,
	66	VIRTIO_NET_F_GUEST_CSUM,
	67	VIRTIO_NET_F_GSO,
	68	VIRTIO_NET_F_GUEST_TSO4,
	69	VIRTIO_NET_F_GUEST_TSO6,
	70	VIRTIO_NET_F_GUEST_ECN,
	71	VIRTIO_NET_F_GUEST_UFO,
	72	VIRTIO_NET_F_HOST_TSO4,
	73	VIRTIO_NET_F_HOST_TSO6,
	74	VIRTIO_NET_F_HOST_ECN,
	75	VIRTIO_NET_F_HOST_UFO,
	76	VIRTIO_NET_F_MRG_RXBUF,
	77	VIRTIO_NET_F_STATUS,
	78	VIRTIO_NET_F_CTRL_VQ,
	79	VIRTIO_NET_F_CTRL_RX,
	80	VIRTIO_NET_F_CTRL_VLAN,
	81	VIRTIO_NET_F_CTRL_RX_EXTRA,
	82	VIRTIO_NET_F_CTRL_MAC_ADDR,
	83	VIRTIO_NET_F_CTRL_GUEST_OFFLOADS,
	84
	85	VIRTIO_NET_F_MQ,
	86
	87	VHOST_INVALID_FEATURE_BIT
	88	};
	89
2e6d46d7	90	static const int vhost_net_get_feature_bits(struct vhost_net net)
d5970055	91	{
2e6d46d7 NN	92	const int *feature_bits = 0;
	93
	94	switch (net->nc->info->type) {
	95	case NET_CLIENT_OPTIONS_KIND_TAP:
	96	feature_bits = kernel_feature_bits;
	97	break;
5f4c01ca NN	98	case NET_CLIENT_OPTIONS_KIND_VHOST_USER:
	99	feature_bits = user_feature_bits;
	100	break;
2e6d46d7 NN	101	default:
	102	error_report("Feature bits not defined for this type: %d",
	103	net->nc->info->type);
	104	break;
ca736c8e	105	}
2e6d46d7 NN	106
	107	return feature_bits;
	108	}
	109
	110	unsigned vhost_net_get_features(struct vhost_net *net, unsigned features)
	111	{
	112	return vhost_get_features(&net->dev, vhost_net_get_feature_bits(net),
	113	features);
d5970055 MT	114	}
	115
	116	void vhost_net_ack_features(struct vhost_net *net, unsigned features)
	117	{
b49ae913	118	net->dev.acked_features = net->dev.backend_features;
2e6d46d7	119	vhost_ack_features(&net->dev, vhost_net_get_feature_bits(net), features);
d5970055 MT	120	}
d5970055 MT	121
4e68f7a0	122	static int vhost_net_get_fd(NetClientState *backend)
d5970055 MT	123	{
d5970055 MT	124	switch (backend->info->type) {
2be64a68	125	case NET_CLIENT_OPTIONS_KIND_TAP:
d5970055 MT	126	return tap_get_fd(backend);
	127	default:
	128	fprintf(stderr, "vhost-net requires tap backend\n");
	129	return -EBADFD;
	130	}
	131	}
	132
81647a65	133	struct vhost_net vhost_net_init(VhostNetOptions options)
d5970055 MT	134	{
d5970055 MT	135	int r;
1a1bfac9	136	bool backend_kernel = options->backend_type == VHOST_BACKEND_TYPE_KERNEL;
7267c094	137	struct vhost_net net = g_malloc(sizeof net);
81647a65 NN	138
	139	if (!options->net_backend) {
	140	fprintf(stderr, "vhost-net requires net backend to be setup\n");
d5970055 MT	141	goto fail;
d5970055 MT	142	}
81647a65	143
1a1bfac9 NN	144	if (backend_kernel) {
	145	r = vhost_net_get_fd(options->net_backend);
	146	if (r < 0) {
	147	goto fail;
	148	}
	149	net->dev.backend_features = qemu_has_vnet_hdr(options->net_backend)
	150	? 0 : (1 << VHOST_NET_F_VIRTIO_NET_HDR);
	151	net->backend = r;
	152	} else {
	153	net->dev.backend_features = 0;
	154	net->backend = -1;
d5970055	155	}
81647a65	156	net->nc = options->net_backend;
d5970055	157
f56a1247 MT	158	net->dev.nvqs = 2;
	159	net->dev.vqs = net->vqs;
	160
81647a65	161	r = vhost_dev_init(&net->dev, options->opaque,
1a1bfac9	162	options->backend_type, options->force);
d5970055 MT	163	if (r < 0) {
	164	goto fail;
	165	}
1a1bfac9	166	if (backend_kernel) {
d8e80ae3 DM	167	if (!qemu_has_vnet_hdr_len(options->net_backend,
	168	sizeof(struct virtio_net_hdr_mrg_rxbuf))) {
	169	net->dev.features &= ~(1 << VIRTIO_NET_F_MRG_RXBUF);
	170	}
1a1bfac9 NN	171	if (~net->dev.features & net->dev.backend_features) {
	172	fprintf(stderr, "vhost lacks feature mask %" PRIu64
	173	" for backend\n",
	174	(uint64_t)(~net->dev.features & net->dev.backend_features));
	175	vhost_dev_cleanup(&net->dev);
	176	goto fail;
	177	}
d5970055	178	}
d5970055 MT	179	/* Set sane init value. Override when guest acks. */
	180	vhost_net_ack_features(net, 0);
	181	return net;
	182	fail:
7267c094	183	g_free(net);
d5970055 MT	184	return NULL;
	185	}
	186
5430a28f MT	187	bool vhost_net_query(VHostNetState net, VirtIODevice dev)
	188	{
	189	return vhost_dev_query(&net->dev, dev);
	190	}
	191
cd7d1d26 JW	192	static void vhost_net_set_vq_index(struct vhost_net *net, int vq_index)
	193	{
	194	net->dev.vq_index = vq_index;
	195	}
	196
a9f98bb5	197	static int vhost_net_start_one(struct vhost_net *net,
cd7d1d26	198	VirtIODevice *dev)
d5970055 MT	199	{
	200	struct vhost_vring_file file = { };
	201	int r;
b0b3db79	202
a9f98bb5 JW	203	net->dev.nvqs = 2;
a9f98bb5 JW	204	net->dev.vqs = net->vqs;
a9f98bb5	205
b0b3db79 MT	206	r = vhost_dev_enable_notifiers(&net->dev, dev);
	207	if (r < 0) {
	208	goto fail_notifiers;
	209	}
d5970055	210
d5970055 MT	211	r = vhost_dev_start(&net->dev, dev);
d5970055 MT	212	if (r < 0) {
b0b3db79	213	goto fail_start;
d5970055 MT	214	}
d5970055 MT	215
212d69f2 NN	216	if (net->nc->info->poll) {
	217	net->nc->info->poll(net->nc, false);
	218	}
	219
1a1bfac9 NN	220	if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP) {
	221	qemu_set_fd_handler(net->backend, NULL, NULL, NULL);
	222	file.fd = net->backend;
	223	for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
	224	const VhostOps *vhost_ops = net->dev.vhost_ops;
	225	r = vhost_ops->vhost_call(&net->dev, VHOST_NET_SET_BACKEND,
	226	&file);
	227	if (r < 0) {
	228	r = -errno;
	229	goto fail;
	230	}
d5970055 MT	231	}
	232	}
	233	return 0;
	234	fail:
	235	file.fd = -1;
1a1bfac9 NN	236	if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP) {
	237	while (file.index-- > 0) {
	238	const VhostOps *vhost_ops = net->dev.vhost_ops;
	239	int r = vhost_ops->vhost_call(&net->dev, VHOST_NET_SET_BACKEND,
	240	&file);
	241	assert(r >= 0);
	242	}
d5970055	243	}
212d69f2 NN	244	if (net->nc->info->poll) {
	245	net->nc->info->poll(net->nc, true);
	246	}
d5970055	247	vhost_dev_stop(&net->dev, dev);
b0b3db79 MT	248	fail_start:
	249	vhost_dev_disable_notifiers(&net->dev, dev);
	250	fail_notifiers:
d5970055 MT	251	return r;
	252	}
	253
a9f98bb5 JW	254	static void vhost_net_stop_one(struct vhost_net *net,
a9f98bb5 JW	255	VirtIODevice *dev)
d5970055 MT	256	{
	257	struct vhost_vring_file file = { .fd = -1 };
	258
1a1bfac9 NN	259	if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP) {
	260	for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
	261	const VhostOps *vhost_ops = net->dev.vhost_ops;
	262	int r = vhost_ops->vhost_call(&net->dev, VHOST_NET_SET_BACKEND,
	263	&file);
	264	assert(r >= 0);
	265	}
d5970055	266	}
212d69f2 NN	267	if (net->nc->info->poll) {
	268	net->nc->info->poll(net->nc, true);
	269	}
d5970055	270	vhost_dev_stop(&net->dev, dev);
b0b3db79	271	vhost_dev_disable_notifiers(&net->dev, dev);
d5970055 MT	272	}
d5970055 MT	273
371df9f5 GK	274	static bool vhost_net_device_endian_ok(VirtIODevice *vdev)
	275	{
	276	#ifdef TARGET_IS_BIENDIAN
	277	#ifdef HOST_WORDS_BIGENDIAN
	278	return virtio_is_big_endian(vdev);
	279	#else
	280	return !virtio_is_big_endian(vdev);
	281	#endif
	282	#else
	283	return true;
	284	#endif
	285	}
	286
a9f98bb5 JW	287	int vhost_net_start(VirtIODevice dev, NetClientState ncs,
	288	int total_queues)
	289	{
1c819449 FK	290	BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
	291	VirtioBusState *vbus = VIRTIO_BUS(qbus);
	292	VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
cd7d1d26	293	int r, e, i;
a9f98bb5	294
371df9f5 GK	295	if (!vhost_net_device_endian_ok(dev)) {
	296	error_report("vhost-net does not support cross-endian");
	297	r = -ENOSYS;
	298	goto err;
	299	}
	300
1c819449	301	if (!k->set_guest_notifiers) {
312fd5f2	302	error_report("binding does not support guest notifiers");
a9f98bb5 JW	303	r = -ENOSYS;
	304	goto err;
	305	}
	306
	307	for (i = 0; i < total_queues; i++) {
cd7d1d26	308	vhost_net_set_vq_index(get_vhost_net(ncs[i].peer), i * 2);
a9f98bb5 JW	309	}
a9f98bb5 JW	310
1c819449	311	r = k->set_guest_notifiers(qbus->parent, total_queues * 2, true);
a9f98bb5	312	if (r < 0) {
312fd5f2	313	error_report("Error binding guest notifier: %d", -r);
a9f98bb5 JW	314	goto err;
	315	}
	316
cd7d1d26 JW	317	for (i = 0; i < total_queues; i++) {
	318	r = vhost_net_start_one(get_vhost_net(ncs[i].peer), dev);
	319
	320	if (r < 0) {
	321	goto err_start;
	322	}
	323	}
	324
a9f98bb5 JW	325	return 0;
a9f98bb5 JW	326
cd7d1d26	327	err_start:
a9f98bb5	328	while (--i >= 0) {
ed8b4afe	329	vhost_net_stop_one(get_vhost_net(ncs[i].peer), dev);
a9f98bb5	330	}
cd7d1d26 JW	331	e = k->set_guest_notifiers(qbus->parent, total_queues * 2, false);
	332	if (e < 0) {
	333	fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", e);
	334	fflush(stderr);
	335	}
	336	err:
a9f98bb5 JW	337	return r;
	338	}
	339
	340	void vhost_net_stop(VirtIODevice dev, NetClientState ncs,
	341	int total_queues)
	342	{
1c819449 FK	343	BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
	344	VirtioBusState *vbus = VIRTIO_BUS(qbus);
	345	VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
a9f98bb5 JW	346	int i, r;
a9f98bb5 JW	347
cd7d1d26 JW	348	for (i = 0; i < total_queues; i++) {
	349	vhost_net_stop_one(get_vhost_net(ncs[i].peer), dev);
	350	}
	351
1c819449	352	r = k->set_guest_notifiers(qbus->parent, total_queues * 2, false);
a9f98bb5 JW	353	if (r < 0) {
	354	fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", r);
	355	fflush(stderr);
	356	}
	357	assert(r >= 0);
a9f98bb5 JW	358	}
a9f98bb5 JW	359
d5970055 MT	360	void vhost_net_cleanup(struct vhost_net *net)
	361	{
	362	vhost_dev_cleanup(&net->dev);
7267c094	363	g_free(net);
d5970055	364	}
f56a1247 MT	365
	366	bool vhost_net_virtqueue_pending(VHostNetState *net, int idx)
	367	{
	368	return vhost_virtqueue_pending(&net->dev, idx);
	369	}
	370
	371	void vhost_net_virtqueue_mask(VHostNetState net, VirtIODevice dev,
	372	int idx, bool mask)
	373	{
	374	vhost_virtqueue_mask(&net->dev, dev, idx, mask);
	375	}
ed8b4afe NN	376
	377	VHostNetState get_vhost_net(NetClientState nc)
	378	{
	379	VHostNetState *vhost_net = 0;
	380
	381	if (!nc) {
	382	return 0;
	383	}
	384
	385	switch (nc->info->type) {
	386	case NET_CLIENT_OPTIONS_KIND_TAP:
	387	vhost_net = tap_get_vhost_net(nc);
	388	break;
03ce5744 NN	389	case NET_CLIENT_OPTIONS_KIND_VHOST_USER:
	390	vhost_net = vhost_user_get_vhost_net(nc);
	391	break;
ed8b4afe NN	392	default:
	393	break;
	394	}
	395
	396	return vhost_net;
	397	}
d5970055	398	#else
81647a65	399	struct vhost_net vhost_net_init(VhostNetOptions options)
5430a28f	400	{
35f75462	401	error_report("vhost-net support is not compiled in");
5430a28f MT	402	return NULL;
	403	}
	404
	405	bool vhost_net_query(VHostNetState net, VirtIODevice dev)
d5970055	406	{
5430a28f	407	return false;
d5970055 MT	408	}
d5970055 MT	409
a9f98bb5 JW	410	int vhost_net_start(VirtIODevice *dev,
	411	NetClientState *ncs,
	412	int total_queues)
d5970055	413	{
5430a28f	414	return -ENOSYS;
d5970055	415	}
a9f98bb5 JW	416	void vhost_net_stop(VirtIODevice *dev,
	417	NetClientState *ncs,
	418	int total_queues)
d5970055 MT	419	{
	420	}
	421
	422	void vhost_net_cleanup(struct vhost_net *net)
	423	{
	424	}
	425
	426	unsigned vhost_net_get_features(struct vhost_net *net, unsigned features)
	427	{
5430a28f	428	return features;
d5970055 MT	429	}
	430	void vhost_net_ack_features(struct vhost_net *net, unsigned features)
	431	{
	432	}
f56a1247 MT	433
	434	bool vhost_net_virtqueue_pending(VHostNetState *net, int idx)
	435	{
4dd72e04	436	return false;
f56a1247 MT	437	}
	438
	439	void vhost_net_virtqueue_mask(VHostNetState net, VirtIODevice dev,
	440	int idx, bool mask)
	441	{
	442	}
ed8b4afe NN	443
	444	VHostNetState get_vhost_net(NetClientState nc)
	445	{
	446	return 0;
	447	}
d5970055	448	#endif