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Date:   Thu, 22 Sep 2022 11:22:50 +0200
From:   Stefano Garzarella <sgarzare@redhat.com>
To:     Jason Wang <jasowang@redhat.com>
Cc:     mst@redhat.com, lulu@redhat.com, xieyongji@bytedance.com,
        linux-kernel@vger.kernel.org, gdawar@xilinx.com,
        virtualization@lists.linux-foundation.org, eperezma@redhat.com,
        wuzongyong@linux.alibaba.com, elic@nvidia.com,
        lingshan.zhu@intel.com
Subject: Re: [PATCH V2 2/3] vdpa_sim_net: support feature provisioning
Message-ID: <20220922092250.pj26iutmywlemvbm@sgarzare-redhat>
References: <20220922024305.1718-1-jasowang@redhat.com>
 <20220922024305.1718-3-jasowang@redhat.com>
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On Thu, Sep 22, 2022 at 10:43:04AM +0800, Jason Wang wrote:
>This patch implements features provisioning for vdpa_sim_net.
>
>1) validating the provisioned features to be a subset of the parent
>   features.
>2) clearing the features that is not wanted by the userspace
>
>For example:
>
># vdpa mgmtdev show
>vdpasim_net:
>  supported_classes net
>  max_supported_vqs 3
>  dev_features MTU MAC CTRL_VQ CTRL_MAC_ADDR ANY_LAYOUT VERSION_1 ACCESS_PLATFORM
>
>1) provision vDPA device with all features that are supported by the
>   net simulator
>
># vdpa dev add name dev1 mgmtdev vdpasim_net
># vdpa dev config show
>dev1: mac 00:00:00:00:00:00 link up link_announce false mtu 1500
>  negotiated_features MTU MAC CTRL_VQ CTRL_MAC_ADDR VERSION_1 ACCESS_PLATFORM
>
>2) provision vDPA device with a subset of the features
>
># vdpa dev add name dev1 mgmtdev vdpasim_net device_features 0x300020000
># vdpa dev config show
>dev1: mac 00:00:00:00:00:00 link up link_announce false mtu 1500
>  negotiated_features CTRL_VQ VERSION_1 ACCESS_PLATFORM
>
>Reviewed-by: Eli Cohen <elic@nvidia.com>
>Signed-off-by: Jason Wang <jasowang@redhat.com>
>---
> drivers/vdpa/vdpa_sim/vdpa_sim_net.c | 11 ++++++++++-
> 1 file changed, 10 insertions(+), 1 deletion(-)
>
>diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim_net.c b/drivers/vdpa/vdpa_sim/vdpa_sim_net.c
>index 886449e88502..a9ba02be378b 100644
>--- a/drivers/vdpa/vdpa_sim/vdpa_sim_net.c
>+++ b/drivers/vdpa/vdpa_sim/vdpa_sim_net.c
>@@ -254,6 +254,14 @@ static int vdpasim_net_dev_add(struct vdpa_mgmt_dev *mdev, const char *name,
> 	dev_attr.work_fn = vdpasim_net_work;
> 	dev_attr.buffer_size = PAGE_SIZE;
>
>+	if (config->mask & BIT_ULL(VDPA_ATTR_DEV_FEATURES)) {
>+		if (config->device_features &
>+		    ~dev_attr.supported_features)
>+			return -EINVAL;
>+		dev_attr.supported_features &=
>+			 config->device_features;
>+	}
>+

How about doing this inside vdpasim_create()?

That way we support this feature in all simulators.

Thanks,
Stefano

> 	simdev = vdpasim_create(&dev_attr);
> 	if (IS_ERR(simdev))
> 		return PTR_ERR(simdev);
>@@ -294,7 +302,8 @@ static struct vdpa_mgmt_dev mgmt_dev = {
> 	.id_table = id_table,
> 	.ops = &vdpasim_net_mgmtdev_ops,
> 	.config_attr_mask = (1 << VDPA_ATTR_DEV_NET_CFG_MACADDR |
>-			     1 << VDPA_ATTR_DEV_NET_CFG_MTU),
>+			     1 << VDPA_ATTR_DEV_NET_CFG_MTU |
>+		             1 << VDPA_ATTR_DEV_FEATURES),
> 	.max_supported_vqs = VDPASIM_NET_VQ_NUM,
> 	.supported_features = VDPASIM_NET_FEATURES,
> };
>-- 
>2.25.1
>
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