linux-kernel - RE: [PATCH V2 2/3] vdpa_sim_net: support feature provisioning

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Date:   Thu, 22 Sep 2022 07:47:40 +0000
From:   Eli Cohen <elic@...dia.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
CC:     Jason Wang <jasowang@...hat.com>,
        "si-wei.liu@...cle.com" <si-wei.liu@...cle.com>,
        Parav Pandit <parav@...dia.com>,
        "wuzongyong@...ux.alibaba.com" <wuzongyong@...ux.alibaba.com>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "eperezma@...hat.com" <eperezma@...hat.com>,
        "lingshan.zhu@...el.com" <lingshan.zhu@...el.com>,
        "gdawar@...inx.com" <gdawar@...inx.com>,
        "lulu@...hat.com" <lulu@...hat.com>,
        "xieyongji@...edance.com" <xieyongji@...edance.com>
Subject: RE: [PATCH V2 2/3] vdpa_sim_net: support feature provisioning



> -----Original Message-----
> From: Michael S. Tsirkin <mst@...hat.com>
> Sent: Thursday, 22 September 2022 10:30
> To: Eli Cohen <elic@...dia.com>
> Cc: Jason Wang <jasowang@...hat.com>; si-wei.liu@...cle.com; Parav
> Pandit <parav@...dia.com>; wuzongyong@...ux.alibaba.com;
> virtualization@...ts.linux-foundation.org; linux-kernel@...r.kernel.org;
> eperezma@...hat.com; lingshan.zhu@...el.com; gdawar@...inx.com;
> lulu@...hat.com; xieyongji@...edance.com
> Subject: Re: [PATCH V2 2/3] vdpa_sim_net: support feature provisioning
> 
> On Thu, Sep 22, 2022 at 05:13:59AM +0000, Eli Cohen wrote:
> > > From: Jason Wang <jasowang@...hat.com>
> > > Sent: Thursday, 22 September 2022 5:43
> > > To: mst@...hat.com; jasowang@...hat.com
> > > Cc: Eli Cohen <elic@...dia.com>; si-wei.liu@...cle.com; Parav Pandit
> > > <parav@...dia.com>; wuzongyong@...ux.alibaba.com;
> > > virtualization@...ts.linux-foundation.org; linux-kernel@...r.kernel.org;
> > > eperezma@...hat.com; lingshan.zhu@...el.com; gdawar@...inx.com;
> > > lulu@...hat.com; xieyongji@...edance.com
> > > Subject: [PATCH V2 2/3] vdpa_sim_net: support feature provisioning
> > >
> > > 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
> >
> > How about "features_mask" instead of "device_features"? Could avoid
> confusion.
> 
> Not sure I agree.
> features_mask to me would mean it is & with features. Not the case here.
> 


See the code below

@@ -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;
+	}
+

> > > # 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@...dia.com>
> > > Signed-off-by: Jason Wang <jasowang@...hat.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;
> > > +	}
> > > +
> > >  	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
> >