netdev - Re: [PATCH] net: Abstract features usage.

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Date:	Tue, 24 May 2011 13:29:15 -0700
From:	Mahesh Bandewar <maheshb@...gle.com>
To:	Michał Mirosław <mirqus@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Tom Herbert <therbert@...gle.com>
Subject: Re: [PATCH] net: Abstract features usage.

On Tue, May 24, 2011 at 12:37 PM, Michał Mirosław <mirqus@...il.com> wrote:
>
> 2011/5/24 Mahesh Bandewar <maheshb@...gle.com>:
> > Define macros to set/clear/test bits for feature set usage. This will eliminate
> > the direct use of these fields and enable future ease in managing these fields.
> >
> > Signed-off-by: Mahesh Bandewar <maheshb@...gle.com>
> > ---
> >  include/linux/netdev_features.h |  137 +++++++++++++++++++++++++++++++++++++++
> >  include/linux/netdevice.h       |   35 ++---------
> >  2 files changed, 142 insertions(+), 30 deletions(-)
> >  create mode 100644 include/linux/netdev_features.h
> >
> > diff --git a/include/linux/netdev_features.h b/include/linux/netdev_features.h
> > new file mode 100644
> > index 0000000..97bf8c4
> > --- /dev/null
> > +++ b/include/linux/netdev_features.h
> > @@ -0,0 +1,137 @@
> > +#ifndef        _NETDEV_FEATURES_H
> > +#define        _NETDEV_FEATURES_H
> > +
> > +/* Forward declarations */
> > +struct net_device;
> > +
> > +typedef        unsigned long *nd_feature_t;
> > +
> > +/* Net device feature bits; if you change something,
> > + * also update netdev_features_strings[] in ethtool.c */
> > +enum netdev_features {
> > +       SG_BIT,                 /* Scatter/gather IO. */
> [...]
>
> Please split this change (introducing enum + converting NETIF_F_*
> defines to use it). This part is a nice cleanup, but I think the
> bitmap idea is still not worth the trouble until u64 runs out.
>
What will we achieve by this split? May be I'm not getting your point
about split. Do you want to see the cleanup part as a separate patch?
These enums and NETIF_F_* values have to be in sync. The macros that I
have defined are expecting this bit numbers rather than the flag
value.

Whether it is u64 or bitmap, the changes should be limited to this
file. Going forward that can be achieved by
simply changing few lines in these macros / inlines.

Thanks,
--mahesh..

> Best Regards,
> Michał Mirosław
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