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vhost-vdpa: introduce vhost-vdpa backend

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Currently we have 2 types of vhost backends in QEMU: vhost kernel and
vhost-user. The above patch provides a generic device for vDPA purpose,
this vDPA device exposes to user space a non-vendor-specific configuration
interface for setting up a vhost HW accelerator, this patch set introduces
a third vhost backend called vhost-vdpa based on the vDPA interface.

Vhost-vdpa usage:

qemu-system-x86_64 -cpu host -enable-kvm \
    ......
    -netdev type=vhost-vdpa,vhostdev=/dev/vhost-vdpa-id,id=vhost-vdpa0 \
    -device virtio-net-pci,netdev=vhost-vdpa0,page-per-vq=on \

Signed-off-by: Lingshan zhu <lingshan.zhu@intel.com>
Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
Signed-off-by: Cindy Lu <lulu@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20200701145538.22333-14-lulu@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Cindy Lu 2020-07-01 22:55:37 +08:00 • committed by Michael S. Tsirkin
parent 38140cc4d9
commit 108a64818e
12 changed files with 600 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

18
hw/net/vhost_net.c
View file

@ -17,6 +17,7 @@
#include "net/net.h"
#include "net/tap.h"
#include "net/vhost-user.h"
#include "net/vhost-vdpa.h"
#include "standard-headers/linux/vhost_types.h"
#include "hw/virtio/virtio-net.h"
@ -33,12 +34,6 @@
#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[] = {
@ -96,6 +91,11 @@ static const int *vhost_net_get_feature_bits(struct vhost_net *net)
case NET_CLIENT_DRIVER_VHOST_USER:
feature_bits = user_feature_bits;
break;
#ifdef CONFIG_VHOST_NET_VDPA
case NET_CLIENT_DRIVER_VHOST_VDPA:
feature_bits = vdpa_feature_bits;
break;
#endif
default:
error_report("Feature bits not defined for this type: %d",
net->nc->info->type);
@ -443,6 +443,12 @@ VHostNetState *get_vhost_net(NetClientState *nc)
vhost_net = vhost_user_get_vhost_net(nc);
assert(vhost_net);
break;
#endif
#ifdef CONFIG_VHOST_NET_VDPA
case NET_CLIENT_DRIVER_VHOST_VDPA:
vhost_net = vhost_vdpa_get_vhost_net(nc);
assert(vhost_net);
break;
#endif
default:
break;