Using Remote Invalidation With RPC-Over-RDMA Transports
draft-cel-nfsv4-reminv-design-05

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Network File System Version 4                                   C. Lever
Internet-Draft                                                    Oracle
Intended status: Informational                            March 13, 2017
Expires: September 14, 2017

        Using Remote Invalidation With RPC-Over-RDMA Transports
                    draft-cel-nfsv4-reminv-design-05

Abstract

   Remote Invalidation relieves RDMA responders of some of the burden of
   preparing memory to be accessed remotely, thus reducing the latency
   of RDMA Read and Write operations.  This document considers how to
   introduce generic support for Remote Invalidation to RPC-over-RDMA
   transport protocols.

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].

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   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on September 14, 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 14, 2017               [Page 1]
Internet-Draft      RPC-over-RDMA Remote Invalidation         March 2017

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

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  General Requirements  . . . . . . . . . . . . . . . . . . . .   4
     2.1.  Memory Management Extensions  . . . . . . . . . . . . . .   4
     2.2.  Registration Types  . . . . . . . . . . . . . . . . . . .   4
     2.3.  Selecting STags To Invalidate Remotely  . . . . . . . . .   5
     2.4.  Future Enhancements . . . . . . . . . . . . . . . . . . .   6
   3.  Remote Invalidation In Operation  . . . . . . . . . . . . . .   6
     3.1.  Determining Remote Invalidation Support Status  . . . . .   7
     3.2.  Selection Of Which STag To Invalidate Remotely  . . . . .   8
     3.3.  Reverse-Direction Operation . . . . . . . . . . . . . . .   8
   4.  Protocol Elements . . . . . . . . . . . . . . . . . . . . . .   9
     4.1.  Per Protocol Version Remote Invalidation  . . . . . . . .   9
     4.2.  Per Connection Remote Invalidation  . . . . . . . . . . .   9
     4.3.  Fixed Protocol Remote Invalidation  . . . . . . . . . . .  10
     4.4.  Per RPC Remote Invalidation (Single STag) . . . . . . . .  11
     4.5.  Per RPC Remote Invalidation (Multiple STags)  . . . . . .  12
     4.6.  Inter-RPC Remote Invalidation . . . . . . . . . . . . . .  13
   5.  Recommendations . . . . . . . . . . . . . . . . . . . . . . .  13
     5.1.  General Considerations  . . . . . . . . . . . . . . . . .  13
     5.2.  Analysis And Discussion . . . . . . . . . . . . . . . . .  14
     5.3.  Example Remote Invalidation Protocol  . . . . . . . . . .  15
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  16
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  17
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  17
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  17
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  18
   Appendix A.  Acknowledgments  . . . . . . . . . . . . . . . . . .  18
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  18

1.  Introduction

   Like other RDMA-enabled storage protocols, RPC-over-RDMA Version One
   employs a Read-Write transfer model when using explicit RDMA
   operations to transfer data [I-D.ietf-nfsv4-rfc5666bis].  This means
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