Stream Schedulers and User Message Interleaving for the Stream Control Transmission Protocol
draft-ietf-tsvwg-sctp-ndata-07

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Document Type Active Internet-Draft (tsvwg WG)
Last updated 2016-09-22 (latest revision 2016-07-21)
Replaces draft-stewart-tsvwg-sctp-ndata
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Network Working Group                                         R. Stewart
Internet-Draft                                             Netflix, Inc.
Intended status: Standards Track                               M. Tuexen
Expires: January 22, 2017               Muenster Univ. of Appl. Sciences
                                                               S. Loreto
                                                                Ericsson
                                                           R. Seggelmann
                                     Metafinanz Informationssysteme GmbH
                                                           July 21, 2016

 Stream Schedulers and User Message Interleaving for the Stream Control
                         Transmission Protocol
                   draft-ietf-tsvwg-sctp-ndata-07.txt

Abstract

   The Stream Control Transmission Protocol (SCTP) is a message oriented
   transport protocol supporting arbitrary large user messages.
   However, the sender can not interleave different user messages which
   causes head of line blocking at the sender side.  To overcome this
   limitation, this document adds a new data chunk to SCTP.

   Whenever an SCTP sender is allowed to send a user data, it can
   possibly choose from multiple outgoing SCTP streams.  Multiple ways
   for this selection, called stream schedulers, are defined.  Some of
   them don't require the support of user message interleaving, some do.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on January 22, 2017.

Stewart, et al.         Expires January 22, 2017                [Page 1]
Internet-Draft   Stream Schedulers and the I-DATA Chunk        July 2016

Copyright Notice

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   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Overview  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Conventions . . . . . . . . . . . . . . . . . . . . . . .   5
   2.  User Message Interleaving . . . . . . . . . . . . . . . . . .   5
     2.1.  The I-DATA Chunk supporting User Message Interleaving . .   5
     2.2.  Procedures  . . . . . . . . . . . . . . . . . . . . . . .   7
       2.2.1.  Negotiation . . . . . . . . . . . . . . . . . . . . .   7
       2.2.2.  Sender Side Considerations  . . . . . . . . . . . . .   8
       2.2.3.  Receiver Side Considerations  . . . . . . . . . . . .   8
     2.3.  Interaction with other SCTP Extensions  . . . . . . . . .   8
       2.3.1.  SCTP Partial Reliability Extension  . . . . . . . . .   9
       2.3.2.  SCTP Stream Reconfiguration Extension . . . . . . . .  10
   3.  Stream Schedulers . . . . . . . . . . . . . . . . . . . . . .  10
     3.1.  First Come First Serve (SCTP_SS_FCFS) . . . . . . . . . .  10
     3.2.  Round Robin Scheduler (SCTP_SS_RR)  . . . . . . . . . . .  11
     3.3.  Round Robin Scheduler per Packet (SCTP_SS_RR_PKT) . . . .  11
     3.4.  Priority Based Scheduler (SCTP_SS_PRIO) . . . . . . . . .  11
     3.5.  Fair Bandwidth Scheduler (SCTP_SS_FB) . . . . . . . . . .  11
     3.6.  Weighted Fair Queueing Scheduler (SCTP_SS_WFQ)  . . . . .  11
   4.  Socket API Considerations . . . . . . . . . . . . . . . . . .  12
     4.1.  Exposition of the Stream Sequence Number (SSN)  . . . . .  12
     4.2.  SCTP_ASSOC_CHANGE Notification  . . . . . . . . . . . . .  12
     4.3.  Socket Options  . . . . . . . . . . . . . . . . . . . . .  12
       4.3.1.  Enable or Disable the Support of User Message
               Interleaving (SCTP_INTERLEAVING_SUPPORTED)  . . . . .  13
       4.3.2.  Get or Set the Stream Scheduler
               (SCTP_STREAM_SCHEDULER) . . . . . . . . . . . . . . .  14
       4.3.3.  Get or Set the Stream Scheduler Parameter
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