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Remote Direct Memory Access (RDMA) Protocol Extensions
RFC 7306

Document type: RFC - Proposed Standard (June 2014; No errata)
Document stream: IETF
Last updated: 2014-06-26
Other versions: plain text, pdf, html

IETF State: Submitted to IESG for Publication Oct 2013
Consensus: Unknown
Document shepherd: Tom Talpey
Shepherd Write-Up: Last changed 2014-03-05

IESG State: RFC 7306 (Proposed Standard)
IANA Action State: RFC-Ed-Ack
Responsible AD: Martin Stiemerling
Send notices to: storm-chairs@tools.ietf.org, draft-ietf-storm-rdmap-ext@tools.ietf.org

Internet Engineering Task Force (IETF)                           H. Shah
Request for Comments: 7306                          Broadcom Corporation
Category: Standards Track                                       F. Marti
ISSN: 2070-1721                                            W. Noureddine
                                                            A. Eiriksson
                                            Chelsio Communications, Inc.
                                                                R. Sharp
                                                       Intel Corporation
                                                               June 2014

         Remote Direct Memory Access (RDMA) Protocol Extensions

Abstract

   This document specifies extensions to the IETF Remote Direct Memory
   Access Protocol (RDMAP) as specified in RFC 5040.  RDMAP provides
   read and write services directly to applications and enables data to
   be transferred directly into Upper-Layer Protocol (ULP) Buffers
   without intermediate data copies.  The extensions specified in this
   document provide the following capabilities and/or improvements:
   Atomic Operations and Immediate Data.

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/rfc7306.

Shah, et al.                 Standards Track                    [Page 1]
RFC 7306                RDMA Protocol Extensions               June 2014

Copyright Notice

   Copyright (c) 2014 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.

Shah, et al.                 Standards Track                    [Page 2]
RFC 7306                RDMA Protocol Extensions               June 2014

Table of Contents

   1. Introduction ....................................................4
      1.1. Discovery of RDMAP Extensions ..............................5
   2. Requirements Language ...........................................5
   3. Glossary ........................................................6
   4. Header Format Extensions ........................................7
      4.1. RDMAP Control and Invalidate STag Fields ...................7
      4.2. RDMA Message Definitions ...................................9
   5. Atomic Operations ...............................................9
      5.1. Atomic Operation Details ..................................10
           5.1.1. FetchAdd ...........................................10
           5.1.2. CmpSwap ............................................12
      5.2. Atomic Operations .........................................13
           5.2.1. Atomic Operation Request Message ...................14
           5.2.2. Atomic Operation Response Message ..................17
      5.3. Atomicity Guarantees ......................................18
      5.4. Atomic Operations Ordering and Completion Rules ...........18
   6. Immediate Data .................................................20
      6.1. RDMAP Interactions with ULP for Immediate Data ............20
      6.2. Immediate Data Header Format ..............................21
      6.3. Immediate Data or Immediate Data with SE Message ..........21
      6.4. Ordering and Completions ..................................22
   7. Ordering and Completions Table .................................22
   8. Error Processing ...............................................25
      8.1. Errors Detected at the Local Peer .........................25
      8.2. Errors Detected at the Remote Peer ........................26
   9. Security Considerations ........................................26
   10. IANA Considerations ...........................................27
      10.1. RDMAP Message Atomic Operation Subcodes ..................27

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