Re: [PATCHv2 net-next 00/12] sctp: Implement Stream Interleave: The I-DATA Chunk Supporting User Message Interleaving

From: Xin Long <lucien.xin@gmail.com>
Date: Fri,  8 Dec 2017 21:03:57 +0800

Stream Interleave would be Implemented in two Parts:

   1. The I-DATA Chunk Supporting User Message Interleaving
   2. Interaction with Other SCTP Extensions

 ...

As the 1st part of Stream Interleave Implementation, this patchset adds
an ops framework named sctp_stream_interleave with a bunch of stuff that
does lots of things needed somewhere.

Then it defines sctp_stream_interleave_0 to work for normal DATA chunks
and sctp_stream_interleave_1 for I-DATA chunks.

With these functions, hundreds of if-else checks for the different process
on I-DATA chunks would be avoided. Besides, very few codes could be shared
in these two function sets.

In this patchset, it adds some basic variables, structures and socket
options firstly, then implement these functions one by one to add the
procedures for ordered idata gradually, at last adjusts some codes to
make them work for unordered idata.

To make it safe to be implemented and also not break the normal data
chunk process, this feature can't be enabled to use until all stream
interleave codes are completely accomplished.

v1 -> v2:
  - fixed a checkpatch warning that a blank line was missed.
  - avoided a kbuild warning reported from gcc-4.9.

Series applied, thanks Xin.