RDMA Connection Manager Private Messages For RPC-Over-RDMA Version One
draft-cel-nfsv4-rpcrdma-cm-pvt-msg-01

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Network File System Version 4                                   C. Lever
Internet-Draft                                                    Oracle
Intended status: Standards Track                          March 28, 2017
Expires: September 29, 2017

 RDMA Connection Manager Private Messages For RPC-Over-RDMA Version One
                 draft-cel-nfsv4-rpcrdma-cm-pvt-msg-01

Abstract

   This document specifies the format of RDMA-CM Private Data exchanged
   between RPC-over-RDMA Version One peers as a transport connection is
   established.  Such messages indicate peer support for Remote
   Invalidation and larger-than-default inline thresholds.  The message
   format is extensible.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

Status of This Memo

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

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   This Internet-Draft will expire on September 29, 2017.

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   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

Lever                  Expires September 29, 2017               [Page 1]
Internet-Draft      RPC-Over-RDMA CM Private Messages         March 2017

   publication of this document.  Please review these documents
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Advertised Transport Capabilities . . . . . . . . . . . . . .   3
     2.1.  Inline Threshold Size . . . . . . . . . . . . . . . . . .   3
     2.2.  Remote Invalidation . . . . . . . . . . . . . . . . . . .   4
   3.  Private Data Message Format . . . . . . . . . . . . . . . . .   5
     3.1.  Fixed Mandatory Fields  . . . . . . . . . . . . . . . . .   5
     3.2.  Extending The Message Format  . . . . . . . . . . . . . .   7
   4.  Interoperability Considerations . . . . . . . . . . . . . . .   7
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Appendix A.  Acknowledgments  . . . . . . . . . . . . . . . . . .   8
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   The RPC-over-RDMA Version One transport protocol enables the use of
   RDMA data transfer for upper layer protocols based on RPC
   [I-D.ietf-nfsv4-rfc5666bis].  The terms "Remote Direct Memory Access"
   (RDMA) and "Direct Data Placement" (DDP) are introduced in [RFC5040].

   The two most immediate shortcomings of RPC-over-RDMA Version One are:

   o  Setting up an RDMA data transfer (via RDMA Read or Write) can be
      costly.  The small maximum size of messages transmitted using RDMA
      Send forces the use of RDMA Read or Write operations even for
      relatively small messages and data payloads.

   o  Unlike most other contemporary RDMA-enabled storage protocols,
      there is no facility in RPC-over-RDMA Version One that enables the
      use of Remote Invalidation [RFC5042].

   The original specification of RPC-over-RDMA Version One provided an
   out-of-band protocol for passing inline threshold settings between
   connected peers [RFC5666].  However, [I-D.ietf-nfsv4-rfc5666bis]
   eliminated support for this protocol making it unavailable for this
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