Remote Direct Memory Access Transport for Remote Procedure Call Version 1
RFC 8166

Document Type RFC - Proposed Standard (June 2017; No errata)
Obsoletes RFC 5666
Last updated 2017-06-30
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Internet Engineering Task Force (IETF)                     C. Lever, Ed.
Request for Comments: 8166                                        Oracle
Obsoletes: 5666                                               W. Simpson
Category: Standards Track                                        Red Hat
ISSN: 2070-1721                                                T. Talpey
                                                               Microsoft
                                                               June 2017

               Remote Direct Memory Access Transport for
                    Remote Procedure Call Version 1

Abstract

   This document specifies a protocol for conveying Remote Procedure
   Call (RPC) messages on physical transports capable of Remote Direct
   Memory Access (RDMA).  This protocol is referred to as the RPC-over-
   RDMA version 1 protocol in this document.  It requires no revision to
   application RPC protocols or the RPC protocol itself.  This document
   obsoletes RFC 5666.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc8166.

Lever, et al.                Standards Track                    [Page 1]
RFC 8166                 RPC-over-RDMA Version 1               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
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Lever, et al.                Standards Track                    [Page 2]
RFC 8166                 RPC-over-RDMA Version 1               June 2017

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
     1.1.  RPCs on RDMA Transports . . . . . . . . . . . . . . . . .   4
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
     2.1.  Requirements Language . . . . . . . . . . . . . . . . . .   5
     2.2.  RPCs  . . . . . . . . . . . . . . . . . . . . . . . . . .   5
     2.3.  RDMA  . . . . . . . . . . . . . . . . . . . . . . . . . .   8
   3.  RPC-over-RDMA Protocol Framework  . . . . . . . . . . . . . .  10
     3.1.  Transfer Models . . . . . . . . . . . . . . . . . . . . .  10
     3.2.  Message Framing . . . . . . . . . . . . . . . . . . . . .  11
     3.3.  Managing Receiver Resources . . . . . . . . . . . . . . .  11
     3.4.  XDR Encoding with Chunks  . . . . . . . . . . . . . . . .  14
     3.5.  Message Size  . . . . . . . . . . . . . . . . . . . . . .  19
   4.  RPC-over-RDMA in Operation  . . . . . . . . . . . . . . . . .  23
     4.1.  XDR Protocol Definition . . . . . . . . . . . . . . . . .  23
     4.2.  Fixed Header Fields . . . . . . . . . . . . . . . . . . .  28
     4.3.  Chunk Lists . . . . . . . . . . . . . . . . . . . . . . .  30
     4.4.  Memory Registration . . . . . . . . . . . . . . . . . . .  33
     4.5.  Error Handling  . . . . . . . . . . . . . . . . . . . . .  34
     4.6.  Protocol Elements No Longer Supported . . . . . . . . . .  37
     4.7.  XDR Examples  . . . . . . . . . . . . . . . . . . . . . .  38
   5.  RPC Bind Parameters . . . . . . . . . . . . . . . . . . . . .  39
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