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

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Date:   Thu, 30 Sep 2021 10:57:26 +0800
From:   "shenjian (K)" <shenjian15@...wei.com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     <davem@...emloft.net>, <kuba@...nel.org>, <hkallweit1@...il.com>,
        <netdev@...r.kernel.org>, <linuxarm@...neuler.org>
Subject: Re: [RFCv2 net-next 000/167] net: extend the netdev_features_t



在 2021/9/30 1:15, Andrew Lunn 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.
> What you should of done is converted just one MAC driver. That gives
> us enough we can review the basic idea, etc, and not need to delete
> 130 nearly identical patches.
>
>     Andrew
> .
OK, I will refine it, make it more reviewable, thanks!

     shenjian

>