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Internet Small Computer System Interface (iSCSI) Extensions for the Remote Direct Memory Access (RDMA) Specification
RFC 7145

Document type: RFC - Proposed Standard (April 2014; No errata)
Obsoletes RFC 5046
Document stream: IETF
Last updated: 2014-04-04
Other versions: plain text, pdf, html

IETF State: Submitted to IESG for Publication
Consensus: Unknown
Document shepherd: David Black
Shepherd Write-Up: Last changed 2012-09-17

IESG State: RFC 7145 (Proposed Standard)
IANA Action State: RFC-Ed-Ack
Responsible AD: Martin Stiemerling
Send notices to: storm-chairs@tools.ietf.org, draft-ietf-storm-iser@tools.ietf.org

Internet Engineering Task Force (IETF)                             M. Ko
Request for Comments: 7145
Obsoletes: 5046                                             A. Nezhinsky
Category: Standards Track                                       Mellanox
ISSN: 2070-1721                                               April 2014

      Internet Small Computer System Interface (iSCSI) Extensions
        for the Remote Direct Memory Access (RDMA) Specification

Abstract

   Internet Small Computer System Interface (iSCSI) Extensions for
   Remote Direct Memory Access (RDMA) provides the RDMA data transfer
   capability to iSCSI by layering iSCSI on top of an RDMA-Capable
   Protocol.  An RDMA-Capable Protocol provides RDMA Read and Write
   services, which enable data to be transferred directly into SCSI I/O
   Buffers without intermediate data copies.  This document describes
   the extensions to the iSCSI protocol to support RDMA services as
   provided by an RDMA-Capable Protocol.

   This document obsoletes RFC 5046.

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/rfc7145.

Ko & Nezhinsky               Standards Track                    [Page 1]
RFC 7145                   iSER Specification                 April 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.

Table of Contents

   1. Introduction ....................................................5
      1.1. Motivation .................................................5
      1.2. iSCSI/iSER Layering ........................................6
      1.3. Architectural Goals ........................................7
      1.4. Protocol Overview ..........................................7
      1.5. RDMA Services and iSER .....................................9
           1.5.1. STag ................................................9
           1.5.2. Send ...............................................10
           1.5.3. RDMA Write .........................................11
           1.5.4. RDMA Read ..........................................11
      1.6. SCSI Read Overview ........................................11
      1.7. SCSI Write Overview .......................................12
   2. Definitions and Acronyms .......................................12
      2.1. Definitions ...............................................12
      2.2. Acronyms ..................................................18
      2.3. Conventions ...............................................20
   3. Upper-Layer Interface Requirements .............................20
      3.1. Operational Primitives offered by iSER ....................21
           3.1.1. Send_Control .......................................21
           3.1.2. Put_Data ...........................................21
           3.1.3. Get_Data ...........................................22
           3.1.4. Allocate_Connection_Resources ......................22
           3.1.5. Deallocate_Connection_Resources ....................23
           3.1.6. Enable_Datamover ...................................23
           3.1.7. Connection_Terminate ...............................23
           3.1.8. Notice_Key_Values ..................................24
           3.1.9. Deallocate_Task_Resources ..........................24
      3.2. Operational Primitives Used by iSER .......................24
           3.2.1. Control_Notify .....................................25
           3.2.2. Data_Completion_Notify .............................25
           3.2.3. Data_ACK_Notify ....................................25

Ko & Nezhinsky               Standards Track                    [Page 2]
RFC 7145                   iSER Specification                 April 2014

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