Stream Schedulers and User Message Interleaving for the Stream Control Transmission Protocol
draft-ietf-tsvwg-sctp-ndata-11

Document Type Active Internet-Draft (tsvwg WG)
Last updated 2017-06-22 (latest revision 2017-06-21)
Replaces draft-stewart-tsvwg-sctp-ndata
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Stream WG state Submitted to IESG for Publication (wg milestone: Apr 2017 - Submit 'SCTP New Dat... )
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Network Working Group                                         R. Stewart
Internet-Draft                                             Netflix, Inc.
Intended status: Standards Track                               M. Tuexen
Expires: December 23, 2017              Muenster Univ. of Appl. Sciences
                                                               S. Loreto
                                                                Ericsson
                                                           R. Seggelmann
                                     Metafinanz Informationssysteme GmbH
                                                           June 21, 2017

 Stream Schedulers and User Message Interleaving for the Stream Control
                         Transmission Protocol
                   draft-ietf-tsvwg-sctp-ndata-11.txt

Abstract

   The Stream Control Transmission Protocol (SCTP) is a message oriented
   transport protocol supporting arbitrarily large user messages.  This
   document adds a new chunk to SCTP for carrying payload data.  This
   allows a sender to interleave different user messages that would
   otherwise result in head of line blocking at the sender.

   Whenever an SCTP sender is allowed to send user data, it may choose
   from multiple outgoing SCTP streams.  Multiple ways for performing
   this selection, called stream schedulers, are defined.  A stream
   scheduler can choose to either implement, or not implement, user
   message interleaving.

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
   Task Force (IETF).  Note that other groups may also distribute
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   This Internet-Draft will expire on December 23, 2017.

Stewart, et al.         Expires December 23, 2017               [Page 1]
Internet-Draft   Stream Schedulers and the I-DATA Chunk        June 2017

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   described in the Simplified BSD License.

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 . .   6
     2.2.  Procedures  . . . . . . . . . . . . . . . . . . . . . . .   7
       2.2.1.  Negotiation . . . . . . . . . . . . . . . . . . . . .   8
       2.2.2.  Sender Side Considerations  . . . . . . . . . . . . .   8
       2.2.3.  Receiver Side Considerations  . . . . . . . . . . . .   9
     2.3.  Interaction with other SCTP Extensions  . . . . . . . . .   9
       2.3.1.  SCTP Partial Reliability Extension  . . . . . . . . .   9
       2.3.2.  SCTP Stream Reconfiguration Extension . . . . . . . .  11
   3.  Stream Schedulers . . . . . . . . . . . . . . . . . . . . . .  11
     3.1.  First Come First Served Scheduler (SCTP_SS_FCFS)  . . . .  11
     3.2.  Round Robin Scheduler (SCTP_SS_RR)  . . . . . . . . . . .  12
     3.3.  Round Robin Scheduler per Packet (SCTP_SS_RR_PKT) . . . .  12
     3.4.  Priority Based Scheduler (SCTP_SS_PRIO) . . . . . . . . .  12
     3.5.  Fair Capacity Scheduler (SCTP_SS_FC)  . . . . . . . . . .  12
     3.6.  Weighted Fair Queueing Scheduler (SCTP_SS_WFQ)  . . . . .  12
   4.  Socket API Considerations . . . . . . . . . . . . . . . . . .  13
     4.1.  Exposure of the Stream Sequence Number (SSN)  . . . . . .  13
     4.2.  SCTP_ASSOC_CHANGE Notification  . . . . . . . . . . . . .  13
     4.3.  Socket Options  . . . . . . . . . . . . . . . . . . . . .  13
       4.3.1.  Enable or Disable the Support of User Message
               Interleaving (SCTP_INTERLEAVING_SUPPORTED)  . . . . .  14
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