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

/*
 * vhost-net support
 *
 * Copyright Red Hat, Inc. 2010
 *
 * Authors:
 *  Michael S. Tsirkin <mst@redhat.com>
 *
 * 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"
#include "hw/virtio/virtio-access.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;

    r = vhost_dev_init(&net->dev, options->opaque,
                       options->backend_type);
    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;
}

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

static int vhost_net_set_vnet_endian(VirtIODevice *dev, NetClientState *peer,
                                     bool set)
{
    int r = 0;

    if (virtio_has_feature(dev, VIRTIO_F_VERSION_1) ||
        (virtio_legacy_is_cross_endian(dev) && !virtio_is_big_endian(dev))) {
        r = qemu_set_vnet_le(peer, set);
        if (r) {
            error_report("backend does not support LE vnet headers");
        }
    } else if (virtio_legacy_is_cross_endian(dev)) {
        r = qemu_set_vnet_be(peer, set);
        if (r) {
            error_report("backend does not support BE vnet headers");
        }
    }

    return r;
}

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,
                                          NULL);
            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);
}

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

    r = vhost_net_set_vnet_endian(dev, ncs[0].peer, true);
    if (r < 0) {
        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_endian;
    }

    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_endian:
    vhost_net_set_vnet_endian(dev, ncs[0].peer, false);
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);

    assert(vhost_net_set_vnet_endian(dev, ncs[0].peer, false) >= 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;
}

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 <mst@redhat.com>
	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"
5be7d9f1	41	#include "hw/virtio/virtio-access.h"
d5970055 MT	42
	43	struct vhost_net {
	44	struct vhost_dev dev;
	45	struct vhost_virtqueue vqs[2];
	46	int backend;
35277d14	47	NetClientState *nc;
d5970055 MT	48	};
d5970055 MT	49
2e6d46d7 NN	50	/* Features supported by host kernel. */
	51	static const int kernel_feature_bits[] = {
	52	VIRTIO_F_NOTIFY_ON_EMPTY,
	53	VIRTIO_RING_F_INDIRECT_DESC,
	54	VIRTIO_RING_F_EVENT_IDX,
	55	VIRTIO_NET_F_MRG_RXBUF,
b1506132	56	VIRTIO_F_VERSION_1,
2e6d46d7 NN	57	VHOST_INVALID_FEATURE_BIT
	58	};
	59
5f4c01ca	60	/* Features supported by others. */
d122f1a2	61	static const int user_feature_bits[] = {
5f4c01ca NN	62	VIRTIO_F_NOTIFY_ON_EMPTY,
	63	VIRTIO_RING_F_INDIRECT_DESC,
	64	VIRTIO_RING_F_EVENT_IDX,
	65
	66	VIRTIO_F_ANY_LAYOUT,
b1506132	67	VIRTIO_F_VERSION_1,
5f4c01ca NN	68	VIRTIO_NET_F_CSUM,
	69	VIRTIO_NET_F_GUEST_CSUM,
	70	VIRTIO_NET_F_GSO,
	71	VIRTIO_NET_F_GUEST_TSO4,
	72	VIRTIO_NET_F_GUEST_TSO6,
	73	VIRTIO_NET_F_GUEST_ECN,
	74	VIRTIO_NET_F_GUEST_UFO,
	75	VIRTIO_NET_F_HOST_TSO4,
	76	VIRTIO_NET_F_HOST_TSO6,
	77	VIRTIO_NET_F_HOST_ECN,
	78	VIRTIO_NET_F_HOST_UFO,
	79	VIRTIO_NET_F_MRG_RXBUF,
	80	VIRTIO_NET_F_STATUS,
	81	VIRTIO_NET_F_CTRL_VQ,
	82	VIRTIO_NET_F_CTRL_RX,
	83	VIRTIO_NET_F_CTRL_VLAN,
	84	VIRTIO_NET_F_CTRL_RX_EXTRA,
	85	VIRTIO_NET_F_CTRL_MAC_ADDR,
	86	VIRTIO_NET_F_CTRL_GUEST_OFFLOADS,
	87
	88	VIRTIO_NET_F_MQ,
	89
	90	VHOST_INVALID_FEATURE_BIT
	91	};
	92
2e6d46d7	93	static const int vhost_net_get_feature_bits(struct vhost_net net)
d5970055	94	{
2e6d46d7 NN	95	const int *feature_bits = 0;
	96
	97	switch (net->nc->info->type) {
	98	case NET_CLIENT_OPTIONS_KIND_TAP:
	99	feature_bits = kernel_feature_bits;
	100	break;
5f4c01ca NN	101	case NET_CLIENT_OPTIONS_KIND_VHOST_USER:
	102	feature_bits = user_feature_bits;
	103	break;
2e6d46d7 NN	104	default:
	105	error_report("Feature bits not defined for this type: %d",
	106	net->nc->info->type);
	107	break;
ca736c8e	108	}
2e6d46d7 NN	109
	110	return feature_bits;
	111	}
	112
9a2ba823	113	uint64_t vhost_net_get_features(struct vhost_net *net, uint64_t features)
2e6d46d7 NN	114	{
	115	return vhost_get_features(&net->dev, vhost_net_get_feature_bits(net),
	116	features);
d5970055 MT	117	}
d5970055 MT	118
9a2ba823	119	void vhost_net_ack_features(struct vhost_net *net, uint64_t features)
d5970055	120	{
b49ae913	121	net->dev.acked_features = net->dev.backend_features;
2e6d46d7	122	vhost_ack_features(&net->dev, vhost_net_get_feature_bits(net), features);
d5970055 MT	123	}
d5970055 MT	124
4e68f7a0	125	static int vhost_net_get_fd(NetClientState *backend)
d5970055 MT	126	{
d5970055 MT	127	switch (backend->info->type) {
2be64a68	128	case NET_CLIENT_OPTIONS_KIND_TAP:
d5970055 MT	129	return tap_get_fd(backend);
	130	default:
	131	fprintf(stderr, "vhost-net requires tap backend\n");
	132	return -EBADFD;
	133	}
	134	}
	135
81647a65	136	struct vhost_net vhost_net_init(VhostNetOptions options)
d5970055 MT	137	{
d5970055 MT	138	int r;
1a1bfac9	139	bool backend_kernel = options->backend_type == VHOST_BACKEND_TYPE_KERNEL;
7267c094	140	struct vhost_net net = g_malloc(sizeof net);
81647a65 NN	141
	142	if (!options->net_backend) {
	143	fprintf(stderr, "vhost-net requires net backend to be setup\n");
d5970055 MT	144	goto fail;
d5970055 MT	145	}
81647a65	146
1a1bfac9 NN	147	if (backend_kernel) {
	148	r = vhost_net_get_fd(options->net_backend);
	149	if (r < 0) {
	150	goto fail;
	151	}
	152	net->dev.backend_features = qemu_has_vnet_hdr(options->net_backend)
9a2ba823	153	? 0 : (1ULL << VHOST_NET_F_VIRTIO_NET_HDR);
1a1bfac9 NN	154	net->backend = r;
	155	} else {
	156	net->dev.backend_features = 0;
	157	net->backend = -1;
d5970055	158	}
81647a65	159	net->nc = options->net_backend;
d5970055	160
f56a1247 MT	161	net->dev.nvqs = 2;
	162	net->dev.vqs = net->vqs;
	163
81647a65	164	r = vhost_dev_init(&net->dev, options->opaque,
1e7398a1	165	options->backend_type);
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
cd7d1d26 JW	190	static void vhost_net_set_vq_index(struct vhost_net *net, int vq_index)
	191	{
	192	net->dev.vq_index = vq_index;
	193	}
	194
5be7d9f1 GK	195	static int vhost_net_set_vnet_endian(VirtIODevice dev, NetClientState peer,
	196	bool set)
	197	{
	198	int r = 0;
	199
	200	if (virtio_has_feature(dev, VIRTIO_F_VERSION_1) \|\|
	201	(virtio_legacy_is_cross_endian(dev) && !virtio_is_big_endian(dev))) {
	202	r = qemu_set_vnet_le(peer, set);
	203	if (r) {
	204	error_report("backend does not support LE vnet headers");
	205	}
	206	} else if (virtio_legacy_is_cross_endian(dev)) {
	207	r = qemu_set_vnet_be(peer, set);
	208	if (r) {
	209	error_report("backend does not support BE vnet headers");
	210	}
	211	}
	212
	213	return r;
	214	}
	215
a9f98bb5	216	static int vhost_net_start_one(struct vhost_net *net,
cd7d1d26	217	VirtIODevice *dev)
d5970055 MT	218	{
	219	struct vhost_vring_file file = { };
	220	int r;
b0b3db79	221
a9f98bb5 JW	222	net->dev.nvqs = 2;
a9f98bb5 JW	223	net->dev.vqs = net->vqs;
a9f98bb5	224
b0b3db79 MT	225	r = vhost_dev_enable_notifiers(&net->dev, dev);
	226	if (r < 0) {
	227	goto fail_notifiers;
	228	}
d5970055	229
d5970055 MT	230	r = vhost_dev_start(&net->dev, dev);
d5970055 MT	231	if (r < 0) {
b0b3db79	232	goto fail_start;
d5970055 MT	233	}
d5970055 MT	234
212d69f2 NN	235	if (net->nc->info->poll) {
	236	net->nc->info->poll(net->nc, false);
	237	}
	238
1a1bfac9 NN	239	if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP) {
	240	qemu_set_fd_handler(net->backend, NULL, NULL, NULL);
	241	file.fd = net->backend;
	242	for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
	243	const VhostOps *vhost_ops = net->dev.vhost_ops;
	244	r = vhost_ops->vhost_call(&net->dev, VHOST_NET_SET_BACKEND,
	245	&file);
	246	if (r < 0) {
	247	r = -errno;
	248	goto fail;
	249	}
d5970055 MT	250	}
	251	}
	252	return 0;
	253	fail:
	254	file.fd = -1;
1a1bfac9 NN	255	if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP) {
	256	while (file.index-- > 0) {
	257	const VhostOps *vhost_ops = net->dev.vhost_ops;
	258	int r = vhost_ops->vhost_call(&net->dev, VHOST_NET_SET_BACKEND,
	259	&file);
	260	assert(r >= 0);
	261	}
d5970055	262	}
212d69f2 NN	263	if (net->nc->info->poll) {
	264	net->nc->info->poll(net->nc, true);
	265	}
d5970055	266	vhost_dev_stop(&net->dev, dev);
b0b3db79 MT	267	fail_start:
	268	vhost_dev_disable_notifiers(&net->dev, dev);
	269	fail_notifiers:
d5970055 MT	270	return r;
	271	}
	272
a9f98bb5 JW	273	static void vhost_net_stop_one(struct vhost_net *net,
a9f98bb5 JW	274	VirtIODevice *dev)
d5970055 MT	275	{
	276	struct vhost_vring_file file = { .fd = -1 };
	277
1a1bfac9 NN	278	if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP) {
	279	for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
	280	const VhostOps *vhost_ops = net->dev.vhost_ops;
	281	int r = vhost_ops->vhost_call(&net->dev, VHOST_NET_SET_BACKEND,
	282	&file);
	283	assert(r >= 0);
	284	}
294ce717 LG	285	} else if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER) {
	286	for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
	287	const VhostOps *vhost_ops = net->dev.vhost_ops;
	288	int r = vhost_ops->vhost_call(&net->dev, VHOST_RESET_OWNER,
d345ed2d	289	NULL);
294ce717 LG	290	assert(r >= 0);
294ce717 LG	291	}
d5970055	292	}
212d69f2 NN	293	if (net->nc->info->poll) {
	294	net->nc->info->poll(net->nc, true);
	295	}
d5970055	296	vhost_dev_stop(&net->dev, dev);
b0b3db79	297	vhost_dev_disable_notifiers(&net->dev, dev);
d5970055 MT	298	}
d5970055 MT	299
a9f98bb5 JW	300	int vhost_net_start(VirtIODevice dev, NetClientState ncs,
	301	int total_queues)
	302	{
1c819449 FK	303	BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
	304	VirtioBusState *vbus = VIRTIO_BUS(qbus);
	305	VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
cd7d1d26	306	int r, e, i;
a9f98bb5	307
1c819449	308	if (!k->set_guest_notifiers) {
312fd5f2	309	error_report("binding does not support guest notifiers");
a9f98bb5 JW	310	r = -ENOSYS;
	311	goto err;
	312	}
	313
5be7d9f1 GK	314	r = vhost_net_set_vnet_endian(dev, ncs[0].peer, true);
	315	if (r < 0) {
	316	goto err;
	317	}
	318
a9f98bb5	319	for (i = 0; i < total_queues; i++) {
cd7d1d26	320	vhost_net_set_vq_index(get_vhost_net(ncs[i].peer), i * 2);
a9f98bb5 JW	321	}
a9f98bb5 JW	322
1c819449	323	r = k->set_guest_notifiers(qbus->parent, total_queues * 2, true);
a9f98bb5	324	if (r < 0) {
312fd5f2	325	error_report("Error binding guest notifier: %d", -r);
5be7d9f1	326	goto err_endian;
a9f98bb5 JW	327	}
a9f98bb5 JW	328
cd7d1d26 JW	329	for (i = 0; i < total_queues; i++) {
	330	r = vhost_net_start_one(get_vhost_net(ncs[i].peer), dev);
	331
	332	if (r < 0) {
	333	goto err_start;
	334	}
	335	}
	336
a9f98bb5 JW	337	return 0;
a9f98bb5 JW	338
cd7d1d26	339	err_start:
a9f98bb5	340	while (--i >= 0) {
ed8b4afe	341	vhost_net_stop_one(get_vhost_net(ncs[i].peer), dev);
a9f98bb5	342	}
cd7d1d26 JW	343	e = k->set_guest_notifiers(qbus->parent, total_queues * 2, false);
	344	if (e < 0) {
	345	fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", e);
	346	fflush(stderr);
	347	}
5be7d9f1 GK	348	err_endian:
5be7d9f1 GK	349	vhost_net_set_vnet_endian(dev, ncs[0].peer, false);
cd7d1d26	350	err:
a9f98bb5 JW	351	return r;
	352	}
	353
	354	void vhost_net_stop(VirtIODevice dev, NetClientState ncs,
	355	int total_queues)
	356	{
1c819449 FK	357	BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
	358	VirtioBusState *vbus = VIRTIO_BUS(qbus);
	359	VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
a9f98bb5 JW	360	int i, r;
a9f98bb5 JW	361
cd7d1d26 JW	362	for (i = 0; i < total_queues; i++) {
	363	vhost_net_stop_one(get_vhost_net(ncs[i].peer), dev);
	364	}
	365
1c819449	366	r = k->set_guest_notifiers(qbus->parent, total_queues * 2, false);
a9f98bb5 JW	367	if (r < 0) {
	368	fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", r);
	369	fflush(stderr);
	370	}
	371	assert(r >= 0);
5be7d9f1 GK	372
5be7d9f1 GK	373	assert(vhost_net_set_vnet_endian(dev, ncs[0].peer, false) >= 0);
a9f98bb5 JW	374	}
a9f98bb5 JW	375
d5970055 MT	376	void vhost_net_cleanup(struct vhost_net *net)
	377	{
	378	vhost_dev_cleanup(&net->dev);
7267c094	379	g_free(net);
d5970055	380	}
f56a1247 MT	381
	382	bool vhost_net_virtqueue_pending(VHostNetState *net, int idx)
	383	{
	384	return vhost_virtqueue_pending(&net->dev, idx);
	385	}
	386
	387	void vhost_net_virtqueue_mask(VHostNetState net, VirtIODevice dev,
	388	int idx, bool mask)
	389	{
	390	vhost_virtqueue_mask(&net->dev, dev, idx, mask);
	391	}
ed8b4afe NN	392
	393	VHostNetState get_vhost_net(NetClientState nc)
	394	{
	395	VHostNetState *vhost_net = 0;
	396
	397	if (!nc) {
	398	return 0;
	399	}
	400
	401	switch (nc->info->type) {
	402	case NET_CLIENT_OPTIONS_KIND_TAP:
	403	vhost_net = tap_get_vhost_net(nc);
	404	break;
03ce5744 NN	405	case NET_CLIENT_OPTIONS_KIND_VHOST_USER:
	406	vhost_net = vhost_user_get_vhost_net(nc);
	407	break;
ed8b4afe NN	408	default:
	409	break;
	410	}
	411
	412	return vhost_net;
	413	}
d5970055	414	#else
81647a65	415	struct vhost_net vhost_net_init(VhostNetOptions options)
5430a28f	416	{
35f75462	417	error_report("vhost-net support is not compiled in");
5430a28f MT	418	return NULL;
	419	}
	420
a9f98bb5 JW	421	int vhost_net_start(VirtIODevice *dev,
	422	NetClientState *ncs,
	423	int total_queues)
d5970055	424	{
5430a28f	425	return -ENOSYS;
d5970055	426	}
a9f98bb5 JW	427	void vhost_net_stop(VirtIODevice *dev,
	428	NetClientState *ncs,
	429	int total_queues)
d5970055 MT	430	{
	431	}
	432
	433	void vhost_net_cleanup(struct vhost_net *net)
	434	{
	435	}
	436
9a2ba823	437	uint64_t vhost_net_get_features(struct vhost_net *net, uint64_t features)
d5970055	438	{
5430a28f	439	return features;
d5970055	440	}
9a2ba823	441	void vhost_net_ack_features(struct vhost_net *net, uint64_t features)
d5970055 MT	442	{
d5970055 MT	443	}
f56a1247 MT	444
	445	bool vhost_net_virtqueue_pending(VHostNetState *net, int idx)
	446	{
4dd72e04	447	return false;
f56a1247 MT	448	}
	449
	450	void vhost_net_virtqueue_mask(VHostNetState net, VirtIODevice dev,
	451	int idx, bool mask)
	452	{
	453	}
ed8b4afe NN	454
	455	VHostNetState get_vhost_net(NetClientState nc)
	456	{
	457	return 0;
	458	}
d5970055	459	#endif