netdev - extending feature word.

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Message-ID: <BANLkTin52LqjxtVT+_y+gGam-QxeLq_iOA@mail.gmail.com>
Date:	Fri, 1 Apr 2011 19:07:05 -0700
From:	Mahesh Bandewar <maheshb@...gle.com>
To:	linux-netdev <netdev@...r.kernel.org>,
	Ben Hutchings <bhutchings@...arflare.com>,
	Michał Mirosław <mirq-linux@...e.qmqm.pl>,
	David Miller <davem@...emloft.net>
Subject: extending feature word.

Thanks for your comments on my loop-back patch. I was looking at the
code today from the perspective of extending various "features" for
word to an array of words and as Michael has pointed out, it's a huge
change. So I'm thinking on the following lines
(include/linux/netdevice.h)

+#define DEV_FEATURE_WORDS      2
+#define LEGACY_FEATURE_WORD    0
       /* currently active device features */
-       u32                     features;
+       u32                     features[DEV_FEATURE_WORDS];
       /* user-changeable features */
-       u32                     hw_features;
+       u32                     hw_features[DEV_FEATURE_WORDS];
       /* user-requested features */
-       u32                     wanted_features;
+       u32                     wanted_features[DEV_FEATURE_WORDS];
       /* VLAN feature mask */
-       u32                     vlan_features;
+       u32                     vlan_features[DEV_FEATURE_WORDS];
+#define legacy_features                features[LEGACY_FEATURE_WORD]
+#define legacy_hw_features     hw_features[LEGACY_FEATURE_WORD]
+#define legacy_wanted_features wanted_features[LEGACY_FEATURE_WORD]
+#define legacy_vlan_features    vlan_features[LEGACY_FEATURE_WORD]


So that it will be a matter of -

s/features/legacy_features/
s/hw_features/legacy_hw_features/
s/wanted_features/legacy_wanted_features/
s/vlan_features/legacy_vlan_features/

to start with as a first step. Once this is done, legacy_* can be
changed with respective arrays and modified as per the need. Comments?

--mahesh..
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