Hi Dave,
can you please consider the following DCCP set of patches. It is a

self-contained set for feature negotiation among endpoints.
These have been tested over a long period in the test tree. 
The set contains the same patches as submitted to netdev/dccp@vger last week.

Thanks to contributions from several people, this revised set contains several

improvements. I have just verified that the set is still fully bisectable.
The set can be pulled from
	git://eden-feed.erg.abdn.ac.uk/net-next-2.6 	[subtree `master']
which uses a fresh net-next-2.6 from today, also compile-tested.
A summary is below, changes can be viewed online at

	http://eden-feed.erg.abdn.ac.uk/cgi-bin/gitweb.cgi?p=net-next-2.6.git
- Gerrit
Part I - Basis

---------------

Patch #1: Provides the basic datastructure for feature negotiation. It gets

          around the problem that feature-negotiation values have no uniform

	  type - they can be 48-bit numbers, single characters, 2-byte integers

	  or a list of unsigned chars.

Patch #2: Provides a lookup-table for the different negotiable features.

Patch #3: Adds list management for the list keeping the negotiation-options.

Patch #4: Initialisation routines (for request sockets and normal sockets).

Patch #5: Analogous to #4, this provides the cleanup routines.

Patch #6: Changes the existing policy to allow anytime changes as that lead

          to unpredictable results.

Patch #7: Adds registration routines. These form part of the user interface

          and are later used by the socket API to set individual preferences.

Patch #8: CCIDs are a negotiable feature. This patch adds support to query the

          supported CCIDs, so as to advertise only the locally supported ones.

Patch #9: The choice of CCID in turn creates new feature dependencies. The patch

          adds automatic tracking of such dependencies to avoid later failure.
Part II - Core

--------------

Patch #10: Provides a mechanism to then resolve CCID-dependent features. Since

           CCIDs are a server-priority feature, this is done by the server.

Patch #11: Deprecates old featneg API, as it was dangerous/clumsy.

Patch #12: Support to negotiate checksum-coverage values (as in UDP-Lite).

Patch #13: Deprecates Ack Ratio sysctl, to enable automatic updating.

Patch #14: Tidies up the setsockopt interface for new additions.

Patch #15: Set/getsockopt support to negotiate CCIDs with the peer.

Patch #16: Socket API to query the current CCID from userspace.

Patch #17: Prepares the variable-length htonl/ntohl functions for 48 bits.

           Such a length is needed by e.g. the Sequence Window feature.

Patch #18: Support for DCCP `Mandatory' type options (RFC 4340, 5.8.2).

Patch #19: Routine to insert feature-negotiation header options.

Patch #20: Complements #19, to add feature-negotiation options onto the skb.

Patch #21: Complements #20 and completes the insertion of featneg options.

Patch #22: Logic/algorithm to actually reconcile negotiation options.

Patch #23: Receiver support to process incoming Change L/R options.

Patch #24: Receiver support to process incoming Confirm R/L options.

Patch #25: Handlers for activating successfully negotiated features.
Part III - Integration and cleanup

----------------------------------

Patch #26: Integration of dynamic negotiation, part I (socket setup).

Patch #27: Integration of dynamic negotiation, part II (server side).

Patch #28: Integration of dynamic negotiation, part III (client side).
Patch #29: Cleans up the older infrastructure.

Patch #30: Removes obsolete parts of the old CCID interface.

Patch #31: Removes manual intervention on NDP count (now automatic).

Patch #32: Removes Ack Vector sysctl (handled automatically now).
Patch #33: Initialisation framework for the supported features.

Patch #34: Auto-loading of CCID modules so that the modules are available

           when the negotiation is completed.

Patch #35: Adds full support for local/remote Sequence Window.

Patch #36: Initialisation and type-checking of involved sysctls.

Patch #37: A set of (useful) debugging/printing helper functions.

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