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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

19
hw/net/virtio-net.c
View file

@ -43,6 +43,7 @@
#include "monitor/qdev.h"
#include "hw/pci/pci.h"
#include "net_rx_pkt.h"
#include "hw/virtio/vhost.h"
#define VIRTIO_NET_VM_VERSION 11
@ -125,6 +126,8 @@ static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config)
VirtIONet *n = VIRTIO_NET(vdev);
struct virtio_net_config netcfg;
int ret = 0;
memset(&netcfg, 0 , sizeof(struct virtio_net_config));
virtio_stw_p(vdev, &netcfg.status, n->status);
virtio_stw_p(vdev, &netcfg.max_virtqueue_pairs, n->max_queues);
virtio_stw_p(vdev, &netcfg.mtu, n->net_conf.mtu);
@ -138,6 +141,15 @@ static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config)
virtio_stl_p(vdev, &netcfg.supported_hash_types,
VIRTIO_NET_RSS_SUPPORTED_HASHES);
memcpy(config, &netcfg, n->config_size);
NetClientState *nc = qemu_get_queue(n->nic);
if (nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_VDPA) {
ret = vhost_net_get_config(get_vhost_net(nc->peer), (uint8_t *)&netcfg,
n->config_size);
if (ret != -1) {
memcpy(config, &netcfg, n->config_size);
}
}
}
static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config)
@ -153,6 +165,13 @@ static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config)
memcpy(n->mac, netcfg.mac, ETH_ALEN);
qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
}
NetClientState *nc = qemu_get_queue(n->nic);
if (nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_VDPA) {
vhost_net_set_config(get_vhost_net(nc->peer), (uint8_t *)&netcfg,
0, n->config_size,
VHOST_SET_CONFIG_TYPE_MASTER);
}
}
static bool virtio_net_started(VirtIONet *n, uint8_t status)