Stream Interleave would be Implemented in two Parts: 1. The I-DATA Chunk Supporting User Message Interleaving 2. Interaction with Other SCTP Extensions Overview in section 1.1 of RFC8260 for Part 1: This document describes a new chunk carrying payload data called I-DATA. This chunk incorporates the properties of the current SCTP DATA chunk, all the flags and fields except the Stream Sequence Number (SSN), and also adds two new fields in its chunk header -- the Fragment Sequence Number (FSN) and the Message Identifier (MID). The FSN is only used for reassembling all fragments that have the same MID and the same ordering property. The TSN is only used for the reliable transfer in combination with Selective Acknowledgment (SACK) chunks. In addition, the MID is also used for ensuring ordered delivery instead of using the stream sequence number (the I-DATA chunk omits an SSN). 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. Xin Long (12): sctp: add stream interleave enable members and sockopt sctp: add asoc intl_enable negotiation during 4 shakehands sctp: add basic structures and make chunk function for idata sctp: implement make_datafrag for sctp_stream_interleave sctp: implement assign_number for sctp_stream_interleave sctp: implement validate_data for sctp_stream_interleave sctp: implement ulpevent_data for sctp_stream_interleave sctp: implement enqueue_event for sctp_stream_interleave sctp: implement renege_events for sctp_stream_interleave sctp: implement start_pd for sctp_stream_interleave sctp: implement abort_pd for sctp_stream_interleave sctp: add support for the process of unordered idata include/linux/sctp.h | 20 + include/net/netns/sctp.h | 5 +- include/net/sctp/constants.h | 9 +- include/net/sctp/sctp.h | 4 +- include/net/sctp/sm.h | 15 +- include/net/sctp/stream_interleave.h | 54 ++ include/net/sctp/structs.h | 56 +- include/net/sctp/ulpevent.h | 23 +- include/net/sctp/ulpqueue.h | 10 +- include/uapi/linux/sctp.h | 3 + net/sctp/Makefile | 2 +- net/sctp/associola.c | 2 +- net/sctp/chunk.c | 8 +- net/sctp/output.c | 5 +- net/sctp/sm_make_chunk.c | 45 +- net/sctp/sm_sideeffect.c | 23 +- net/sctp/sm_statefuns.c | 21 +- net/sctp/sm_statetable.c | 3 + net/sctp/socket.c | 130 +++- net/sctp/stream.c | 1 + net/sctp/stream_interleave.c | 1118 ++++++++++++++++++++++++++++++++++ net/sctp/ulpevent.c | 15 +- net/sctp/ulpqueue.c | 23 +- 23 files changed, 1501 insertions(+), 94 deletions(-) create mode 100644 include/net/sctp/stream_interleave.h create mode 100644 net/sctp/stream_interleave.c -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-sctp" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
