RPC-over-RDMA Version 2 Protocol
draft-ietf-nfsv4-rpcrdma-version-two-02

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Last updated 2020-07-03
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Network File System Version 4                              C. Lever, Ed.
Internet-Draft                                                    Oracle
Intended status: Standards Track                               D. Noveck
Expires: 4 January 2021                                           NetApp
                                                             3 July 2020

                    RPC-over-RDMA Version 2 Protocol
                draft-ietf-nfsv4-rpcrdma-version-two-02

Abstract

   This document specifies the second version of a transport protocol
   that conveys Remote Procedure Call (RPC) messages using Remote Direct
   Memory Access (RDMA).  This version of the protocol is extensible.

Note

   Discussion of this draft takes place on the NFSv4 working group
   mailing list (nfsv4@ietf.org), which is archived at
   https://mailarchive.ietf.org/arch/browse/nfsv4/. Working Group
   information can be found at https://datatracker.ietf.org/wg/nfsv4/
   about/.

   This note is to be removed before publishing as an RFC.

   The source for this draft is maintained in GitHub.  Suggested changes
   can be submitted as pull requests at https://github.com/chucklever/
   i-d-rpcrdma-version-two.  Instructions are on that page as well.

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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   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on 4 January 2021.

Lever & Noveck           Expires 4 January 2021                 [Page 1]
Internet-Draft           RPC-over-RDMA Version 2               July 2020

Copyright Notice

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   than English.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   5
     1.1.  Design Goals  . . . . . . . . . . . . . . . . . . . . . .   5
     1.2.  Motivation for a New Version  . . . . . . . . . . . . . .   6
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   7
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   7
     3.1.  Remote Procedure Calls  . . . . . . . . . . . . . . . . .   7
       3.1.1.  Upper-Layer Protocols . . . . . . . . . . . . . . . .   7
       3.1.2.  Requesters and Responders . . . . . . . . . . . . . .   7
       3.1.3.  RPC Transports  . . . . . . . . . . . . . . . . . . .   8
       3.1.4.  External Data Representation  . . . . . . . . . . . .  10
     3.2.  Remote Direct Memory Access . . . . . . . . . . . . . . .  11
       3.2.1.  Direct Data Placement . . . . . . . . . . . . . . . .  11
       3.2.2.  RDMA Transport Requirements . . . . . . . . . . . . .  12
   4.  RPC-over-RDMA Framework . . . . . . . . . . . . . . . . . . .  14
     4.1.  Message Framing . . . . . . . . . . . . . . . . . . . . .  14
     4.2.  Managing Receiver Resources . . . . . . . . . . . . . . .  15
       4.2.1.  Flow Control  . . . . . . . . . . . . . . . . . . . .  15
       4.2.2.  Inline Threshold  . . . . . . . . . . . . . . . . . .  16
       4.2.3.  Initial Connection State  . . . . . . . . . . . . . .  17
     4.3.  XDR Encoding with Chunks  . . . . . . . . . . . . . . . .  18
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