From: Julian Cordes <julian.cordes@gmail.com>
Date: Tue, 17 Jan 2017 13:08:52 +0000
Subject: Suboptimal handling of packets containing FORWARD-TSN and DATA chunks
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WWhenever receiving packets containing FORWARD-TSN chunks bundled with a
DATA-Chunk the linux kernel sends currently two SACK-Chunks.
This is suboptimal, because after processing both received chunks, it
could send one SACK-Chunk.

 Testscripts available at:
 - https://github.com/nplab/PR_SCTP_Testsuite/blob/master/forward-tsn/receiver-side-implementation/packet-loss/ordered/ordered-packet-loss-5.pkt
 - https://github.com/nplab/PR_SCTP_Testsuite/blob/master/forward-tsn/receiver-side-implementation/packet-loss/ordered/ordered-packet-loss-12.pkt
 - https://github.com/nplab/PR_SCTP_Testsuite/blob/master/forward-tsn/receiver-side-implementation/packet-loss/ordered/ordered-packet-loss-13.pkt
 - https://github.com/nplab/PR_SCTP_Testsuite/blob/master/forward-tsn/receiver-side-implementation/packet-loss/unordered/unordered-packet-loss-2.pkt
 - https://github.com/nplab/PR_SCTP_Testsuite/blob/master/forward-tsn/receiver-side-implementation/packet-loss/unordered/unordered-packet-loss-5.pkt
 - https://github.com/nplab/PR_SCTP_Testsuite/blob/master/forward-tsn/receiver-side-implementation/packet-loss/unordered/unordered-packet-loss-12.pkt


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