Re: [PATCH v2] hw/virtio/vhost-user: support obtain vdpa device's mac address automatically

["Alex Bennée" <alex.bennee@linaro.org>]

chenh <chenh@yusur.tech> writes:

> From: Hao Chen <chenh@yusur.tech>
>
> When use dpdk-vdpa tests vdpa device. You need to specify the mac address to
> start the virtual machine through libvirt or qemu, but now, the libvirt or
> qemu can call dpdk vdpa vendor driver's ops .get_config through vhost_net_get_config
> to get the mac address of the vdpa hardware without manual configuration.
>
> v1->v2:
> Only copy ETH_ALEN data of netcfg for some vdpa device such as
> NVIDIA BLUEFIELD DPU(BF2)'s netcfg->status is not right.
> We only need the mac address and don't care about the status field.
>
> Signed-off-by: Hao Chen <chenh@yusur.tech>
> ---
>  hw/block/vhost-user-blk.c |  1 -
>  hw/net/virtio-net.c       |  7 +++++++
>  hw/virtio/vhost-user.c    | 19 -------------------
>  3 files changed, 7 insertions(+), 20 deletions(-)
>
> diff --git a/hw/block/vhost-user-blk.c b/hw/block/vhost-user-blk.c
> index 9117222456..5dca4eab09 100644
> --- a/hw/block/vhost-user-blk.c
> +++ b/hw/block/vhost-user-blk.c
> @@ -337,7 +337,6 @@ static int vhost_user_blk_connect(DeviceState *dev, Error **errp)
>  
>      vhost_dev_set_config_notifier(&s->dev, &blk_ops);
>  
> -    s->vhost_user.supports_config = true;

<snip>

NACK from me. The supports_config flag is there for a reason.

>  
> diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c
> index bd24741be8..8b01078249 100644
> --- a/hw/virtio/vhost-user.c
> +++ b/hw/virtio/vhost-user.c
> @@ -2013,8 +2013,6 @@ static int vhost_user_backend_init(struct vhost_dev *dev, void *opaque,
>      }
>  
>      if (virtio_has_feature(features, VHOST_USER_F_PROTOCOL_FEATURES)) {
> -        bool supports_f_config = vus->supports_config ||
> -            (dev->config_ops && dev->config_ops->vhost_dev_config_notifier);
>          uint64_t protocol_features;
>  
>          dev->backend_features |= 1ULL << VHOST_USER_F_PROTOCOL_FEATURES;
> @@ -2033,23 +2031,6 @@ static int vhost_user_backend_init(struct vhost_dev *dev, void *opaque,
>           */
>          protocol_features &= VHOST_USER_PROTOCOL_FEATURE_MASK;
>  
> -        if (supports_f_config) {
> -            if (!virtio_has_feature(protocol_features,
> -                                    VHOST_USER_PROTOCOL_F_CONFIG)) {
> -                error_setg(errp, "vhost-user device expecting "
> -                           "VHOST_USER_PROTOCOL_F_CONFIG but the vhost-user backend does "
> -                           "not support it.");
> -                return -EPROTO;
> -            }
> -        } else {
> -            if (virtio_has_feature(protocol_features,
> -                                   VHOST_USER_PROTOCOL_F_CONFIG)) {
> -                warn_reportf_err(*errp, "vhost-user backend supports "
> -                                 "VHOST_USER_PROTOCOL_F_CONFIG but QEMU does not.");
> -                protocol_features &= ~(1ULL << VHOST_USER_PROTOCOL_F_CONFIG);
> -            }
> -        }
> -
>          /* final set of protocol features */
>          dev->protocol_features = protocol_features;
>          err = vhost_user_set_protocol_features(dev, dev->protocol_features);


-- 
Alex Bennée