Bidirectional Remote Procedure Call on RPC-over-RDMA Transports
RFC 8167
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RFC - Proposed Standard
(June 2017; No errata)
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Last updated |
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2017-06-30
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IETF
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bibtex
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WG state
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Submitted to IESG for Publication
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Document shepherd |
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Spencer Shepler
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Shepherd write-up |
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Show
(last changed 2016-11-28)
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| IESG |
IESG state |
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RFC 8167 (Proposed Standard)
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Consensus Boilerplate |
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Yes
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Responsible AD |
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Spencer Dawkins
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"Spencer Shepler" <spencer.shepler@gmail.com>
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| IANA |
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Version Changed - Review Needed
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No IANA Actions
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Internet Engineering Task Force (IETF) C. Lever
Request for Comments: 8167 Oracle
Category: Standards Track June 2017
ISSN: 2070-1721
Bidirectional Remote Procedure Call on RPC-over-RDMA Transports
Abstract
Minor versions of Network File System (NFS) version 4 newer than
minor version 0 work best when Remote Procedure Call (RPC) transports
can send RPC transactions in both directions on the same connection.
This document describes how RPC transport endpoints capable of Remote
Direct Memory Access (RDMA) convey RPCs in both directions on a
single connection.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 7841.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc8167.
Copyright Notice
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
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Lever Standards Track [Page 1]
RFC 8167 Bidirectional RPC-over-RDMA June 2017
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Understanding RPC Direction . . . . . . . . . . . . . . . . . 3
3. Immediate Uses of Bidirectional RPC-over-RDMA . . . . . . . . 5
4. Flow Control . . . . . . . . . . . . . . . . . . . . . . . . 6
5. Sending and Receiving Operations in the Reverse Direction . . 8
6. In the Absence of Support for Reverse-Direction Operation . . 11
7. Considerations for ULBs . . . . . . . . . . . . . . . . . . . 11
8. Security Considerations . . . . . . . . . . . . . . . . . . . 12
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 12
10. Normative References . . . . . . . . . . . . . . . . . . . . 12
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 13
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 13
1. Introduction
RPC-over-RDMA transports, introduced in [RFC8166], efficiently convey
Remote Procedure Call (RPC) transactions on transport layers capable
of Remote Direct Memory Access (RDMA). The purpose of this document
is to enable concurrent operation in both directions on a single
transport connection using RPC-over-RDMA protocol versions that do
not have specific facilities for reverse-direction operation.
Reverse-direction RPC transactions are necessary for the operation of
version 4.1 of the Network File System (NFS), and in particular, of
Parallel NFS (pNFS) [RFC5661], though any Upper-Layer Protocol (ULP)
implementation may make use of them. An Upper-Layer Binding (ULB)
for NFS version 4.x callback operation is additionally required (see
Section 7) but is not provided in this document.
For example, using the approach described herein, RPC transactions
can be conveyed in both directions on the same RPC-over-RDMA version
1 connection without changes to the RPC-over-RDMA version 1 protocol.
This document does not update the protocol specified in [RFC8166].
The remainder of this document assumes familiarity with the
terminology and concepts contained in [RFC8166], especially Sections
2 and 3.
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in
BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
Lever Standards Track [Page 2]
RFC 8167 Bidirectional RPC-over-RDMA June 2017
2. Understanding RPC Direction
The Open Network Computing Remote Procedure Call (ONC RPC) protocol
as described in [RFC5531] is architected as a message-passing
protocol between one server and one or more clients. ONC RPC
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