[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,
    VIRTIO_F_VERSION_1,
    VHOST_INVALID_FEATURE_BIT
};

/* Features supported by others. */
static 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_F_VERSION_1,
    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;
}

uint64_t vhost_net_get_features(struct vhost_net *net, uint64_t features)
{
    return vhost_get_features(&net->dev, vhost_net_get_feature_bits(net),
            features);
}

void vhost_net_ack_features(struct vhost_net *net, uint64_t 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 : (1ULL << 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;
    net->dev.vq_index = net->nc->queue_index;

    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 &= ~(1ULL << 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);
        }
    } else if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER) {
        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_RESET_OWNER,
                                          &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)
{
}

uint64_t vhost_net_get_features(struct vhost_net *net, uint64_t features)
{
    return features;
}
void vhost_net_ack_features(struct vhost_net *net, uint64_t 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,
b1506132	55	VIRTIO_F_VERSION_1,
2e6d46d7 NN	56	VHOST_INVALID_FEATURE_BIT
	57	};
	58
5f4c01ca	59	/* Features supported by others. */
d122f1a2	60	static const int user_feature_bits[] = {
5f4c01ca NN	61	VIRTIO_F_NOTIFY_ON_EMPTY,
	62	VIRTIO_RING_F_INDIRECT_DESC,
	63	VIRTIO_RING_F_EVENT_IDX,
	64
	65	VIRTIO_F_ANY_LAYOUT,
b1506132	66	VIRTIO_F_VERSION_1,
5f4c01ca NN	67	VIRTIO_NET_F_CSUM,
	68	VIRTIO_NET_F_GUEST_CSUM,
	69	VIRTIO_NET_F_GSO,
	70	VIRTIO_NET_F_GUEST_TSO4,
	71	VIRTIO_NET_F_GUEST_TSO6,
	72	VIRTIO_NET_F_GUEST_ECN,
	73	VIRTIO_NET_F_GUEST_UFO,
	74	VIRTIO_NET_F_HOST_TSO4,
	75	VIRTIO_NET_F_HOST_TSO6,
	76	VIRTIO_NET_F_HOST_ECN,
	77	VIRTIO_NET_F_HOST_UFO,
	78	VIRTIO_NET_F_MRG_RXBUF,
	79	VIRTIO_NET_F_STATUS,
	80	VIRTIO_NET_F_CTRL_VQ,
	81	VIRTIO_NET_F_CTRL_RX,
	82	VIRTIO_NET_F_CTRL_VLAN,
	83	VIRTIO_NET_F_CTRL_RX_EXTRA,
	84	VIRTIO_NET_F_CTRL_MAC_ADDR,
	85	VIRTIO_NET_F_CTRL_GUEST_OFFLOADS,
	86
	87	VIRTIO_NET_F_MQ,
	88
	89	VHOST_INVALID_FEATURE_BIT
	90	};
	91
2e6d46d7	92	static const int vhost_net_get_feature_bits(struct vhost_net net)
d5970055	93	{
2e6d46d7 NN	94	const int *feature_bits = 0;
	95
	96	switch (net->nc->info->type) {
	97	case NET_CLIENT_OPTIONS_KIND_TAP:
	98	feature_bits = kernel_feature_bits;
	99	break;
5f4c01ca NN	100	case NET_CLIENT_OPTIONS_KIND_VHOST_USER:
	101	feature_bits = user_feature_bits;
	102	break;
2e6d46d7 NN	103	default:
	104	error_report("Feature bits not defined for this type: %d",
	105	net->nc->info->type);
	106	break;
ca736c8e	107	}
2e6d46d7 NN	108
	109	return feature_bits;
	110	}
	111
9a2ba823	112	uint64_t vhost_net_get_features(struct vhost_net *net, uint64_t features)
2e6d46d7 NN	113	{
	114	return vhost_get_features(&net->dev, vhost_net_get_feature_bits(net),
	115	features);
d5970055 MT	116	}
d5970055 MT	117
9a2ba823	118	void vhost_net_ack_features(struct vhost_net *net, uint64_t features)
d5970055	119	{
b49ae913	120	net->dev.acked_features = net->dev.backend_features;
2e6d46d7	121	vhost_ack_features(&net->dev, vhost_net_get_feature_bits(net), features);
d5970055 MT	122	}
d5970055 MT	123
4e68f7a0	124	static int vhost_net_get_fd(NetClientState *backend)
d5970055 MT	125	{
d5970055 MT	126	switch (backend->info->type) {
2be64a68	127	case NET_CLIENT_OPTIONS_KIND_TAP:
d5970055 MT	128	return tap_get_fd(backend);
	129	default:
	130	fprintf(stderr, "vhost-net requires tap backend\n");
	131	return -EBADFD;
	132	}
	133	}
	134
81647a65	135	struct vhost_net vhost_net_init(VhostNetOptions options)
d5970055 MT	136	{
d5970055 MT	137	int r;
1a1bfac9	138	bool backend_kernel = options->backend_type == VHOST_BACKEND_TYPE_KERNEL;
7267c094	139	struct vhost_net net = g_malloc(sizeof net);
81647a65 NN	140
	141	if (!options->net_backend) {
	142	fprintf(stderr, "vhost-net requires net backend to be setup\n");
d5970055 MT	143	goto fail;
d5970055 MT	144	}
81647a65	145
1a1bfac9 NN	146	if (backend_kernel) {
	147	r = vhost_net_get_fd(options->net_backend);
	148	if (r < 0) {
	149	goto fail;
	150	}
	151	net->dev.backend_features = qemu_has_vnet_hdr(options->net_backend)
9a2ba823	152	? 0 : (1ULL << VHOST_NET_F_VIRTIO_NET_HDR);
1a1bfac9 NN	153	net->backend = r;
	154	} else {
	155	net->dev.backend_features = 0;
	156	net->backend = -1;
d5970055	157	}
81647a65	158	net->nc = options->net_backend;
d5970055	159
f56a1247 MT	160	net->dev.nvqs = 2;
f56a1247 MT	161	net->dev.vqs = net->vqs;
830d70db	162	net->dev.vq_index = net->nc->queue_index;
f56a1247	163
81647a65	164	r = vhost_dev_init(&net->dev, options->opaque,
1a1bfac9	165	options->backend_type, options->force);
d5970055 MT	166	if (r < 0) {
	167	goto fail;
	168	}
1a1bfac9	169	if (backend_kernel) {
d8e80ae3 DM	170	if (!qemu_has_vnet_hdr_len(options->net_backend,
d8e80ae3 DM	171	sizeof(struct virtio_net_hdr_mrg_rxbuf))) {
9a2ba823	172	net->dev.features &= ~(1ULL << VIRTIO_NET_F_MRG_RXBUF);
d8e80ae3	173	}
1a1bfac9 NN	174	if (~net->dev.features & net->dev.backend_features) {
	175	fprintf(stderr, "vhost lacks feature mask %" PRIu64
	176	" for backend\n",
	177	(uint64_t)(~net->dev.features & net->dev.backend_features));
	178	vhost_dev_cleanup(&net->dev);
	179	goto fail;
	180	}
d5970055	181	}
d5970055 MT	182	/* Set sane init value. Override when guest acks. */
	183	vhost_net_ack_features(net, 0);
	184	return net;
	185	fail:
7267c094	186	g_free(net);
d5970055 MT	187	return NULL;
	188	}
	189
5430a28f MT	190	bool vhost_net_query(VHostNetState net, VirtIODevice dev)
	191	{
	192	return vhost_dev_query(&net->dev, dev);
	193	}
	194
cd7d1d26 JW	195	static void vhost_net_set_vq_index(struct vhost_net *net, int vq_index)
	196	{
	197	net->dev.vq_index = vq_index;
	198	}
	199
a9f98bb5	200	static int vhost_net_start_one(struct vhost_net *net,
cd7d1d26	201	VirtIODevice *dev)
d5970055 MT	202	{
	203	struct vhost_vring_file file = { };
	204	int r;
b0b3db79	205
a9f98bb5 JW	206	net->dev.nvqs = 2;
a9f98bb5 JW	207	net->dev.vqs = net->vqs;
a9f98bb5	208
b0b3db79 MT	209	r = vhost_dev_enable_notifiers(&net->dev, dev);
	210	if (r < 0) {
	211	goto fail_notifiers;
	212	}
d5970055	213
d5970055 MT	214	r = vhost_dev_start(&net->dev, dev);
d5970055 MT	215	if (r < 0) {
b0b3db79	216	goto fail_start;
d5970055 MT	217	}
d5970055 MT	218
212d69f2 NN	219	if (net->nc->info->poll) {
	220	net->nc->info->poll(net->nc, false);
	221	}
	222
1a1bfac9 NN	223	if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP) {
	224	qemu_set_fd_handler(net->backend, NULL, NULL, NULL);
	225	file.fd = net->backend;
	226	for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
	227	const VhostOps *vhost_ops = net->dev.vhost_ops;
	228	r = vhost_ops->vhost_call(&net->dev, VHOST_NET_SET_BACKEND,
	229	&file);
	230	if (r < 0) {
	231	r = -errno;
	232	goto fail;
	233	}
d5970055 MT	234	}
	235	}
	236	return 0;
	237	fail:
	238	file.fd = -1;
1a1bfac9 NN	239	if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP) {
	240	while (file.index-- > 0) {
	241	const VhostOps *vhost_ops = net->dev.vhost_ops;
	242	int r = vhost_ops->vhost_call(&net->dev, VHOST_NET_SET_BACKEND,
	243	&file);
	244	assert(r >= 0);
	245	}
d5970055	246	}
212d69f2 NN	247	if (net->nc->info->poll) {
	248	net->nc->info->poll(net->nc, true);
	249	}
d5970055	250	vhost_dev_stop(&net->dev, dev);
b0b3db79 MT	251	fail_start:
	252	vhost_dev_disable_notifiers(&net->dev, dev);
	253	fail_notifiers:
d5970055 MT	254	return r;
	255	}
	256
a9f98bb5 JW	257	static void vhost_net_stop_one(struct vhost_net *net,
a9f98bb5 JW	258	VirtIODevice *dev)
d5970055 MT	259	{
	260	struct vhost_vring_file file = { .fd = -1 };
	261
1a1bfac9 NN	262	if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP) {
	263	for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
	264	const VhostOps *vhost_ops = net->dev.vhost_ops;
	265	int r = vhost_ops->vhost_call(&net->dev, VHOST_NET_SET_BACKEND,
	266	&file);
	267	assert(r >= 0);
	268	}
294ce717 LG	269	} else if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER) {
	270	for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
	271	const VhostOps *vhost_ops = net->dev.vhost_ops;
	272	int r = vhost_ops->vhost_call(&net->dev, VHOST_RESET_OWNER,
830d70db	273	&file);
294ce717 LG	274	assert(r >= 0);
294ce717 LG	275	}
d5970055	276	}
212d69f2 NN	277	if (net->nc->info->poll) {
	278	net->nc->info->poll(net->nc, true);
	279	}
d5970055	280	vhost_dev_stop(&net->dev, dev);
b0b3db79	281	vhost_dev_disable_notifiers(&net->dev, dev);
d5970055 MT	282	}
d5970055 MT	283
371df9f5 GK	284	static bool vhost_net_device_endian_ok(VirtIODevice *vdev)
	285	{
	286	#ifdef TARGET_IS_BIENDIAN
	287	#ifdef HOST_WORDS_BIGENDIAN
	288	return virtio_is_big_endian(vdev);
	289	#else
	290	return !virtio_is_big_endian(vdev);
	291	#endif
	292	#else
	293	return true;
	294	#endif
	295	}
	296
a9f98bb5 JW	297	int vhost_net_start(VirtIODevice dev, NetClientState ncs,
	298	int total_queues)
	299	{
1c819449 FK	300	BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
	301	VirtioBusState *vbus = VIRTIO_BUS(qbus);
	302	VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
cd7d1d26	303	int r, e, i;
a9f98bb5	304
371df9f5 GK	305	if (!vhost_net_device_endian_ok(dev)) {
	306	error_report("vhost-net does not support cross-endian");
	307	r = -ENOSYS;
	308	goto err;
	309	}
	310
1c819449	311	if (!k->set_guest_notifiers) {
312fd5f2	312	error_report("binding does not support guest notifiers");
a9f98bb5 JW	313	r = -ENOSYS;
	314	goto err;
	315	}
	316
	317	for (i = 0; i < total_queues; i++) {
cd7d1d26	318	vhost_net_set_vq_index(get_vhost_net(ncs[i].peer), i * 2);
a9f98bb5 JW	319	}
a9f98bb5 JW	320
1c819449	321	r = k->set_guest_notifiers(qbus->parent, total_queues * 2, true);
a9f98bb5	322	if (r < 0) {
312fd5f2	323	error_report("Error binding guest notifier: %d", -r);
a9f98bb5 JW	324	goto err;
	325	}
	326
cd7d1d26 JW	327	for (i = 0; i < total_queues; i++) {
	328	r = vhost_net_start_one(get_vhost_net(ncs[i].peer), dev);
	329
	330	if (r < 0) {
	331	goto err_start;
	332	}
	333	}
	334
a9f98bb5 JW	335	return 0;
a9f98bb5 JW	336
cd7d1d26	337	err_start:
a9f98bb5	338	while (--i >= 0) {
ed8b4afe	339	vhost_net_stop_one(get_vhost_net(ncs[i].peer), dev);
a9f98bb5	340	}
cd7d1d26 JW	341	e = k->set_guest_notifiers(qbus->parent, total_queues * 2, false);
	342	if (e < 0) {
	343	fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", e);
	344	fflush(stderr);
	345	}
	346	err:
a9f98bb5 JW	347	return r;
	348	}
	349
	350	void vhost_net_stop(VirtIODevice dev, NetClientState ncs,
	351	int total_queues)
	352	{
1c819449 FK	353	BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
	354	VirtioBusState *vbus = VIRTIO_BUS(qbus);
	355	VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
a9f98bb5 JW	356	int i, r;
a9f98bb5 JW	357
cd7d1d26 JW	358	for (i = 0; i < total_queues; i++) {
	359	vhost_net_stop_one(get_vhost_net(ncs[i].peer), dev);
	360	}
	361
1c819449	362	r = k->set_guest_notifiers(qbus->parent, total_queues * 2, false);
a9f98bb5 JW	363	if (r < 0) {
	364	fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", r);
	365	fflush(stderr);
	366	}
	367	assert(r >= 0);
a9f98bb5 JW	368	}
a9f98bb5 JW	369
d5970055 MT	370	void vhost_net_cleanup(struct vhost_net *net)
	371	{
	372	vhost_dev_cleanup(&net->dev);
7267c094	373	g_free(net);
d5970055	374	}
f56a1247 MT	375
	376	bool vhost_net_virtqueue_pending(VHostNetState *net, int idx)
	377	{
	378	return vhost_virtqueue_pending(&net->dev, idx);
	379	}
	380
	381	void vhost_net_virtqueue_mask(VHostNetState net, VirtIODevice dev,
	382	int idx, bool mask)
	383	{
	384	vhost_virtqueue_mask(&net->dev, dev, idx, mask);
	385	}
ed8b4afe NN	386
	387	VHostNetState get_vhost_net(NetClientState nc)
	388	{
	389	VHostNetState *vhost_net = 0;
	390
	391	if (!nc) {
	392	return 0;
	393	}
	394
	395	switch (nc->info->type) {
	396	case NET_CLIENT_OPTIONS_KIND_TAP:
	397	vhost_net = tap_get_vhost_net(nc);
	398	break;
03ce5744 NN	399	case NET_CLIENT_OPTIONS_KIND_VHOST_USER:
	400	vhost_net = vhost_user_get_vhost_net(nc);
	401	break;
ed8b4afe NN	402	default:
	403	break;
	404	}
	405
	406	return vhost_net;
	407	}
d5970055	408	#else
81647a65	409	struct vhost_net vhost_net_init(VhostNetOptions options)
5430a28f	410	{
35f75462	411	error_report("vhost-net support is not compiled in");
5430a28f MT	412	return NULL;
	413	}
	414
	415	bool vhost_net_query(VHostNetState net, VirtIODevice dev)
d5970055	416	{
5430a28f	417	return false;
d5970055 MT	418	}
d5970055 MT	419
a9f98bb5 JW	420	int vhost_net_start(VirtIODevice *dev,
	421	NetClientState *ncs,
	422	int total_queues)
d5970055	423	{
5430a28f	424	return -ENOSYS;
d5970055	425	}
a9f98bb5 JW	426	void vhost_net_stop(VirtIODevice *dev,
	427	NetClientState *ncs,
	428	int total_queues)
d5970055 MT	429	{
	430	}
	431
	432	void vhost_net_cleanup(struct vhost_net *net)
	433	{
	434	}
	435
9a2ba823	436	uint64_t vhost_net_get_features(struct vhost_net *net, uint64_t features)
d5970055	437	{
5430a28f	438	return features;
d5970055	439	}
9a2ba823	440	void vhost_net_ack_features(struct vhost_net *net, uint64_t features)
d5970055 MT	441	{
d5970055 MT	442	}
f56a1247 MT	443
	444	bool vhost_net_virtqueue_pending(VHostNetState *net, int idx)
	445	{
4dd72e04	446	return false;
f56a1247 MT	447	}
	448
	449	void vhost_net_virtqueue_mask(VHostNetState net, VirtIODevice dev,
	450	int idx, bool mask)
	451	{
	452	}
ed8b4afe NN	453
	454	VHostNetState get_vhost_net(NetClientState nc)
	455	{
	456	return 0;
	457	}
d5970055	458	#endif