Transport-generic Network File System (NFS) Upper Layer Bindings To RPC- Over-RDMA
draft-dnoveck-nfsv4-nfsulb-00

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Network File System Version 4                                  D. Noveck
Internet-Draft                                          February 1, 2017
Intended status: Standards Track
Expires: August 5, 2017

Transport-generic Network File System (NFS) Upper Layer Bindings To RPC-
                               Over-RDMA
                     draft-dnoveck-nfsv4-nfsulb-00

Abstract

   This document specifies Upper Layer Bindings to allow use of RPC-
   over-RDMA by protocols related to the Network File System (NFS).
   Such bindings are required when using RPC-over-RDMA, in order to
   enable use of Direct Data Placement and for a number of other
   reasons.  These bindings are structured to be applicable to all known
   version of the RPC-over-RDMA transport, including optional
   extensions.  All versions of NFS are addressed.

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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Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Noveck                   Expires August 5, 2017                 [Page 1]
Internet-Draft         Transport-generic NFS ULBs          February 2017

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Conveying NFS Operations On RPC-Over-RDMA . . . . . . . . . .   3
     2.1.  Direct Placement of Request Data  . . . . . . . . . . . .   4
     2.2.  Direct Placement of Response Data . . . . . . . . . . . .   4
     2.3.  Scatter-gather when Using DDP . . . . . . . . . . . . . .   5
     2.4.  DDP-eligibility Violations  . . . . . . . . . . . . . . .   5
     2.5.  Long Calls and Replies  . . . . . . . . . . . . . . . . .   6
   3.  Preparatory Material for Multiple Bindings  . . . . . . . . .   6
     3.1.  Reply Size Estimation . . . . . . . . . . . . . . . . . .   7
     3.2.  Retry to Deal with Reply Size Mis-estimation  . . . . . .   7
   4.  Upper Layer Binding for NFS Versions 2 And 3  . . . . . . . .   8
     4.1.  Auxiliary Protocols . . . . . . . . . . . . . . . . . . .   9
   5.  Upper Layer Binding for NFS Version 4 . . . . . . . . . . . .  10
     5.1.  DDP-Eligibility . . . . . . . . . . . . . . . . . . . . .  10
     5.2.  NFS Version 4 Reply Size Estimation . . . . . . . . . . .  11
     5.3.  NFS Version 4 COMPOUND Requests . . . . . . . . . . . . .  12
     5.4.  NFS Version 4 Callback  . . . . . . . . . . . . . . . . .  14
     5.5.  Session-Related Considerations  . . . . . . . . . . . . .  15
     5.6.  Connection Keep-Alive . . . . . . . . . . . . . . . . . .  16
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