netdev - Re: [PATCH 08/37] dccp: Query supported CCIDs

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Date:	Fri, 29 Aug 2008 08:17:04 +0200
From:	Gerrit Renker <gerrit@....abdn.ac.uk>
To:	Arnaldo Carvalho de Melo <acme@...hat.com>, dccp@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH 08/37] dccp: Query supported CCIDs

Quoting Arnaldo:
| Em Thu, Aug 28, 2008 at 07:44:43PM +0200, Gerrit Renker escreveu:
| > This provides a data structure to record which CCIDs are locally supported
| > and three accessor functions:
| >  - a test function for internal use which is used to validate CCID requests
| >    made by the user;
| >  - a copy function so that the list can be used for feature-negotiation;
| >  - documented getsockopt() support so that the user can query capabilities.
| > 
| > The data structure is a table which is filled in at compile-time with the
| > list of available CCIDs (which in turn depends on the Kconfig choices).
| > 
| > Using the copy function for cloning the list of supported CCIDs is useful for
| > feature negotiation, since the negotiation is now with the full list of available
| > CCIDs (e.g. {2, 3}) instead of the default value {2}. This means negotiation
| > will not fail if the peer requests to use CCID3 instead of CCID2.
| 
| But this limits us to the CCIDs at kernel build time, what if I want to
| test CCID4? I guess we could have something like a bitmap and check if
| the bit for that CCID is set, and it would be set at ccid_register time.
| 
| Perhaps using include/linux/bitmap.h :-)
| 
Or have a look at how it has been done in the CCID-4 subtree for about a year?
Please take a look at
http://eden-feed.erg.abdn.ac.uk/cgi-bin/gitweb.cgi?p=dccp_exp.git;a=commitdiff;h=d88f6d5505f83f4c19a3417fbf3ee8874c87d227

And also (shows age of the patches):
http://www.mail-archive.com/dccp@vger.kernel.org/msg02613.html	

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