netdev - Re: [RFCv2 net-next 000/167] net: extend the netdev_features

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Date:   Thu, 27 Jan 2022 11:50:28 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     "shenjian (K)" <shenjian15@...wei.com>
Cc:     davem@...emloft.net, kuba@...nel.org, andrew@...n.ch,
        hkallweit1@...il.com, netdev@...r.kernel.org,
        linuxarm@...neuler.org
Subject: Re: [RFCv2 net-next 000/167] net: extend the netdev_features_t

On Thu, Jan 27, 2022 at 05:40:02PM +0800, shenjian (K) wrote:
> 
> 
> 在 2022/1/27 17:16, Leon Romanovsky 写道:
> > On Wed, Sep 29, 2021 at 11:50:47PM +0800, Jian Shen wrote:
> > > For the prototype of netdev_features_t is u64, and the number
> > > of netdevice feature bits is 64 now. So there is no space to
> > > introduce new feature bit.
> > > 
> > > This patchset try to solve it by change the prototype of
> > > netdev_features_t from u64 to bitmap. With this change,
> > > it's necessary to introduce a set of bitmap operation helpers
> > > for netdev features. Meanwhile, the functions which use
> > > netdev_features_t as return value are also need to be changed,
> > > return the result as an output parameter.
> > > 
> > > With above changes, it will affect hundreds of files, and all the
> > > nic drivers. To make it easy to be reviewed, split the changes
> > > to 167 patches to 5 parts.
> > > 
> > > patch 1~22: convert the prototype which use netdev_features_t
> > > as return value
> > > patch 24: introduce fake helpers for bitmap operation
> > > patch 25~165: use netdev_feature_xxx helpers
> > > patch 166: use macro __DECLARE_NETDEV_FEATURE_MASK to replace
> > > netdev_feature_t declaration.
> > > patch 167: change the type of netdev_features_t to bitmap,
> > > and rewrite the bitmap helpers.
> > > 
> > > Sorry to send a so huge patchset, I wanna to get more suggestions
> > > to finish this work, to make it much more reviewable and feasible.
> > > 
> > > The former discussing for the changes, see [1]
> > > [1]. https://www.spinics.net/lists/netdev/msg753528.html
> > > 
> > ------------------------------------------------
> > 
> > Is anyone actively working on this task?
> > 
> > Thanks
> > .
> Hi Leon,
> 
> I have sent RFCv4  [1] three months ago, and according Andrew' suggestion，
> I'm trying to
> continue this work with semantic-patches, and waiting for more comments
> for the scheme.
> But I'm not familiar with it, and  busy with some other work recently, so it
> got delayed.
> 
> Sorry for this. I will speed up it.

Thanks

> 
> [1] https://lore.kernel.org/netdev/YYvKyruLcemj6J+i@lunn.ch/T/
> 
> Thanks
> 
>