netdev - Re: [PATCHv3] net: Define enum for the bits used in features.

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Date:	Tue, 7 Jun 2011 23:55:10 -0700
From:	Mahesh Bandewar <maheshb@...gle.com>
To:	David Miller <davem@...emloft.net>
Cc:	mst@...hat.com, linux-netdev <netdev@...r.kernel.org>,
	Tom Herbert <therbert@...gle.com>,
	Michał Mirosław <mirqus@...il.com>,
	Stephen Hemminger <shemminger@...tta.com>
Subject: Re: [PATCHv3] net: Define enum for the bits used in features.

On Mon, Jun 6, 2011 at 12:20 PM, David Miller <davem@...emloft.net> wrote:
> From: "Michael S. Tsirkin" <mst@...hat.com>
> Date: Mon, 6 Jun 2011 18:32:53 +0300
>
>> On Sun, Jun 05, 2011 at 10:15:37PM -0700, David Miller wrote:
>>> Since the GSO accessors deal with mutliple bits, you can create
>>> special GSO specific interfaces to manipulate them.
>>
>> Yes but it's not just GSO.
>> It's anything that includes more than 1 feature.
>> Examples:
>> NETIF_F_ALL_CSUM
>> NETIF_F_ALL_TX_OFFLOADS
>> NETIF_F_V6_CSUM
>> NETIF_F_SOFT_FEATURES
>>
>> etc
>>
>> Creating many accessors for each will need a lot
>> of code duplication ...
>
> Yet this is something you must resolve in order to change the feature
> bit implementation.
>
> Whether this issue is difficult or not to address, it has to be done
> either way.
>

I agree that the cleanup is not really necessary to the feature
extension as such but this along with the other patch that I have
posted is the beginning of that work. It's definitely not complete and
also not as simple as it sounds / feels because of these constants
defined which are "or-ed" flag values (listed above). I think it will
be nice to get this done in as little code as possible, but I think
that should be the constraint.

In these two patches I have created separate header file
"netdev_features.h" where everything related to "features" should
reside including all these accessor macros / functions.

--mahesh..
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