RDMA Connection Manager Private Data For RPC-Over-RDMA Version 1
draft-ietf-nfsv4-rpcrdma-cm-pvt-data-01
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Network File System Version 4 C. Lever
Internet-Draft Oracle
Intended status: Informational November 6, 2018
Expires: May 10, 2019
RDMA Connection Manager Private Data For RPC-Over-RDMA Version 1
draft-ietf-nfsv4-rpcrdma-cm-pvt-data-01
Abstract
This document specifies the format of RDMA-CM Private Data exchanged
between RPC-over-RDMA version 1 peers as a transport connection is
established. Such private data is used to indicate peer support for
remote invalidation and larger-than-default inline thresholds.
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
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on May 10, 2019.
Copyright Notice
Copyright (c) 2018 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
(https://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 Expires May 10, 2019 [Page 1]
Internet-Draft RPC-Over-RDMA CM Private Data November 2018
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Requirements Language . . . . . . . . . . . . . . . . . . . . 3
3. Advertised Transport Properties . . . . . . . . . . . . . . . 3
3.1. Inline Threshold Size . . . . . . . . . . . . . . . . . . 3
3.2. Remote Invalidation . . . . . . . . . . . . . . . . . . . 4
4. Private Data Message Format . . . . . . . . . . . . . . . . . 5
4.1. Interoperability Considerations . . . . . . . . . . . . . 6
5. Updating the Message Format . . . . . . . . . . . . . . . . . 7
5.1. Feature Support Flags . . . . . . . . . . . . . . . . . . 7
5.2. Inline Threshold Values . . . . . . . . . . . . . . . . . 8
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 8
7. Security Considerations . . . . . . . . . . . . . . . . . . . 9
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 9
8.1. Normative References . . . . . . . . . . . . . . . . . . 9
8.2. Informative References . . . . . . . . . . . . . . . . . 9
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 10
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 10
1. Introduction
The RPC-over-RDMA version 1 transport protocol enables the use of
RDMA data transfer for upper layer protocols based on RPC [RFC8166].
The terms "Remote Direct Memory Access" (RDMA) and "Direct Data
Placement" (DDP) are introduced in [RFC5040].
The two most immediate shortcomings of RPC-over-RDMA version 1 are:
o Setting up an RDMA data transfer (via RDMA Read or Write) can be
costly. The small default size of messages transmitted using RDMA
Send forces the use of RDMA Read or Write operations even for
relatively small messages and data payloads.
The original specification of RPC-over-RDMA version 1 provided an
out-of-band protocol for passing inline threshold values between
connected peers [RFC5666]. However, [RFC8166] eliminated support
for this protocol making it unavailable for this purpose.
o Unlike most other contemporary RDMA-enabled storage protocols,
there is no facility in RPC-over-RDMA version 1 that enables the
use of remote invalidation [RFC5042].
RPC-over-RDMA version 1 has no means of extending its XDR definition
in such a way that interoperability with existing implementations is
preserved. As a result, an out-of-band mechanism is needed to help
relieve these constraints for existing RPC-over-RDMA version 1
implementations.
Lever Expires May 10, 2019 [Page 2]
Internet-Draft RPC-Over-RDMA CM Private Data November 2018
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