RPC-over-RDMA Version One Implementation Experience
draft-ietf-nfsv4-rfc5666-implementation-experience-00

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NFSv4                                                           C. Lever
Internet-Draft                                                    Oracle
Intended status: Informational                          November 2, 2015
Expires: May 5, 2016

          RPC-over-RDMA Version One Implementation Experience
         draft-ietf-nfsv4-rfc5666-implementation-experience-00

Abstract

   This document details experiences and challenges implementing the
   RPC-over-RDMA Version One protocol.  Specification changes are
   recommended to address avoidable interoperability failures.

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Lever                      Expires May 5, 2016                  [Page 1]
Internet-Draft     RFC 5666 Implementation Experience      November 2015

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
     1.2.  Purpose Of This Document  . . . . . . . . . . . . . . . .   3
     1.3.  Updating RFC 5666 . . . . . . . . . . . . . . . . . . . .   4
   2.  RPC-Over-RDMA Essentials  . . . . . . . . . . . . . . . . . .   5
     2.1.  Arguments And Results . . . . . . . . . . . . . . . . . .   5
     2.2.  Remote Direct Memory Access . . . . . . . . . . . . . . .   5
       2.2.1.  Direct Data Placement . . . . . . . . . . . . . . . .   6
       2.2.2.  Channel Operation . . . . . . . . . . . . . . . . . .   6
       2.2.3.  Explicit RDMA Operation . . . . . . . . . . . . . . .   7
     2.3.  Transfer Models . . . . . . . . . . . . . . . . . . . . .   7
       2.3.1.  Read-Read . . . . . . . . . . . . . . . . . . . . . .   7
       2.3.2.  Write-Write . . . . . . . . . . . . . . . . . . . . .   7
       2.3.3.  Read-Write  . . . . . . . . . . . . . . . . . . . . .   8
     2.4.  Upper Layer Binding Specifications  . . . . . . . . . . .   8
     2.5.  On-The-Wire Protocol  . . . . . . . . . . . . . . . . . .   8
       2.5.1.  Inline Operation  . . . . . . . . . . . . . . . . . .   8
       2.5.2.  RDMA Segment  . . . . . . . . . . . . . . . . . . . .  11
       2.5.3.  Chunk . . . . . . . . . . . . . . . . . . . . . . . .  11
       2.5.4.  Read Chunk  . . . . . . . . . . . . . . . . . . . . .  12
       2.5.5.  Write Chunk . . . . . . . . . . . . . . . . . . . . .  12
       2.5.6.  Read List . . . . . . . . . . . . . . . . . . . . . .  13
       2.5.7.  Write List  . . . . . . . . . . . . . . . . . . . . .  14
       2.5.8.  Position Zero Read Chunk  . . . . . . . . . . . . . .  14
       2.5.9.  Reply Chunk . . . . . . . . . . . . . . . . . . . . .  15
   3.  Specification Issues  . . . . . . . . . . . . . . . . . . . .  15
     3.1.  Extensibility Considerations  . . . . . . . . . . . . . .  15
       3.1.1.  Recommendations . . . . . . . . . . . . . . . . . . .  16
     3.2.  XDR Clarifications  . . . . . . . . . . . . . . . . . . .  16
       3.2.1.  Recommendations . . . . . . . . . . . . . . . . . . .  18
     3.3.  The Position Zero Read Chunk  . . . . . . . . . . . . . .  19
       3.3.1.  Recommendations . . . . . . . . . . . . . . . . . . .  21
     3.4.  RDMA_NOMSG Call Messages  . . . . . . . . . . . . . . . .  21
       3.4.1.  Recommendations . . . . . . . . . . . . . . . . . . .  22
     3.5.  RDMA_MSG Call with Position Zero Read Chunk . . . . . . .  22
       3.5.1.  Recommendations . . . . . . . . . . . . . . . . . . .  23
     3.6.  Padding Inline Content After A Chunk  . . . . . . . . . .  23
       3.6.1.  Recommendations . . . . . . . . . . . . . . . . . . .  25
     3.7.  Write List XDR Roundup  . . . . . . . . . . . . . . . . .  25
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