Enhanced Remote Direct Memory Access (RDMA) Connection Establishment
RFC 6581
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RFC - Proposed Standard
(April 2012; No errata)
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Last updated |
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2015-10-14
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IETF
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plain text
pdf
html
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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No shepherd assigned
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IESG state |
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RFC 6581 (Proposed Standard)
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Consensus Boilerplate |
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Unknown
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Telechat date |
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Responsible AD |
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Martin Stiemerling
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IESG note |
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David Black (david.black@emc.com) is the document shepherd.
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Send notices to |
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(None)
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Internet Engineering Task Force (IETF) A. Kanevsky, Ed.
Request for Comments: 6581 Dell Inc.
Updates: 5043, 5044 C. Bestler, Ed.
Category: Standards Track Nexenta Systems
ISSN: 2070-1721 R. Sharp
Intel
S. Wise
Open Grid Computing
April 2012
Enhanced Remote Direct Memory Access (RDMA)
Connection Establishment
Abstract
This document updates RFC 5043 and RFC 5044 by extending Marker
Protocol Data Unit (PDU) Aligned Framing (MPA) negotiation for Remote
Direct Memory Access (RDMA) connection establishment. The first
enhancement extends RFC 5044, enabling peer-to-peer connection
establishment over MPA / Transmission Control Protocol (TCP). The
second enhancement extends both RFC 5043 and RFC 5044, by providing
an option for standardized exchange of RDMA-layer connection
configuration.
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 5741.
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/rfc6581.
Kanevsky, et al. Standards Track [Page 1]
RFC 6581 Enhanced RDMA Connection Establishment April 2012
Copyright Notice
Copyright (c) 2012 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.
Table of Contents
1. Introduction ....................................................3
1.1. Summary of Changes Affecting RFC 5044 ......................4
1.2. Summary of Changes Affecting RFC 5043 ......................4
2. Requirements Language ...........................................4
3. Definitions .....................................................4
4. Motivations .....................................................7
4.1. Standardization of RDMA Read Parameter Configuration .......7
4.2. Enabling MPA Mode ..........................................9
4.3. Lack of Explicit RTR in MPA Request/Reply Exchange ........10
4.4. Limitations on ULP Workaround .............................11
4.4.1. Transport Neutral APIs .............................11
4.4.2. Work/Completion Queue Accounting ...................11
4.4.3. Host-based Implementation of MPA Fencing ...........12
5. Enhanced MPA Connection Establishment ..........................13
6. Enhanced MPA Request/Reply Frames ..............................14
7. Enhanced SCTP Session Control Chunks ...........................15
8. MPA Error Reporting ............................................16
9. Enhanced RDMA Connection Establishment Data ....................17
9.1. IRD and ORD Negotiation ...................................18
9.2. Peer-to-Peer Connection Negotiation .......................20
9.3. Enhanced Connection Negotiation Flow ......................21
10. Interoperability ..............................................21
11. IANA Considerations ...........................................22
12. Security Considerations .......................................23
13. Acknowledgements ..............................................23
14. References ....................................................23
14.1. Normative References .....................................23
14.2. Informative References ...................................24
Kanevsky, et al. Standards Track [Page 2]
RFC 6581 Enhanced RDMA Connection Establishment April 2012
1. Introduction
When used over the Transmission Control Protocol (TCP), the current
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