netdev - Re: [PATCH V5 0/6] ifcvf/vDPA: support query device config space through netlink

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Date:   Fri, 12 Aug 2022 07:17:14 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Zhu Lingshan <lingshan.zhu@...el.com>
Cc:     jasowang@...hat.com, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, kvm@...r.kernel.org, parav@...dia.com,
        xieyongji@...edance.com, gautam.dawar@....com
Subject: Re: [PATCH V5 0/6] ifcvf/vDPA: support query device config space
 through netlink

On Fri, Aug 12, 2022 at 07:14:39AM -0400, Michael S. Tsirkin wrote:
> On Fri, Aug 12, 2022 at 06:44:54PM +0800, Zhu Lingshan wrote:
> > This series allows userspace to query device config space of vDPA
> > devices and the management devices through netlink,
> > to get multi-queue, feature bits and etc.
> > 
> > This series has introduced a new netlink attr
> > VDPA_ATTR_VDPA_DEV_SUPPORTED_FEATURES, this should be used to query
> > features of vDPA  devices than the management device.
> > 
> > Please help review.
> 
> I can't merge this for this merge window.
> Am I right when I say that the new thing here is patch 5/6 + new
> comments?
> If yes I can queue it out of the window, on top.

So at this point, can you please send patches on top of the vhost
tree? I think these are just patches 3 and 5 but please confirm.


> > Thanks!
> > Zhu Lingshan
> > 
> > Changes rom V4:
> > (1) Read MAC, MTU, MQ conditionally (Michael)
> > (2) If VIRTIO_NET_F_MAC not set, don't report MAC to userspace
> > (3) If VIRTIO_NET_F_MTU not set, report 1500 to userspace
> > (4) Add comments to the new attr
> > VDPA_ATTR_VDPA_DEV_SUPPORTED_FEATURES(Michael)
> > (5) Add comments for reporting the device status as LE(Michael)
> > 
> > Changes from V3:
> > (1)drop the fixes tags(Parva)
> > (2)better commit log for patch 1/6(Michael)
> > (3)assign num_queues to max_supported_vqs than max_vq_pairs(Jason)
> > (4)initialize virtio pci capabilities in the probe() function.
> > 
> > Changes from V2:
> > Add fixes tags(Parva)
> > 
> > Changes from V1:
> > (1) Use __virito16_to_cpu(true, xxx) for the le16 casting(Jason)
> > (2) Add a comment in ifcvf_get_config_size(), to explain
> > why we should return the minimum value of
> > sizeof(struct virtio_net_config) and the onboard
> > cap size(Jason)
> > (3) Introduced a new attr VDPA_ATTR_VDPA_DEV_SUPPORTED_FEATURES
> > (4) Show the changes of iproute2 output before and after 5/6 patch(Jason)
> > (5) Fix cast warning in vdpa_fill_stats_rec() 
> > 
> > Zhu Lingshan (6):
> >   vDPA/ifcvf: get_config_size should return a value no greater than dev
> >     implementation
> >   vDPA/ifcvf: support userspace to query features and MQ of a management
> >     device
> >   vDPA: allow userspace to query features of a vDPA device
> >   vDPA: !FEATURES_OK should not block querying device config space
> >   vDPA: Conditionally read fields in virtio-net dev config space
> >   fix 'cast to restricted le16' warnings in vdpa.c
> > 
> >  drivers/vdpa/ifcvf/ifcvf_base.c |  13 ++-
> >  drivers/vdpa/ifcvf/ifcvf_base.h |   2 +
> >  drivers/vdpa/ifcvf/ifcvf_main.c | 142 +++++++++++++++++---------------
> >  drivers/vdpa/vdpa.c             |  82 ++++++++++++------
> >  include/uapi/linux/vdpa.h       |   3 +
> >  5 files changed, 149 insertions(+), 93 deletions(-)
> > 
> > -- 
> > 2.31.1