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Internet Small Computer System Interface (iSCSI) Extensions for Remote Direct Memory Access (RDMA)
RFC 5046

Document type: RFC - Proposed Standard (October 2007; No errata)
Obsoleted by RFC 7145
Updated by RFC 7146
Document stream: IETF
Last updated: 2013-03-02
Other versions: plain text, pdf, html

IETF State: (None)
Consensus: Unknown
Document shepherd: No shepherd assigned

IESG State: RFC 5046 (Proposed Standard)
Responsible AD: Lars Eggert
Send notices to: ips-chairs@tools.ietf.org

Network Working Group                                              M. Ko
Request for Comments: 5046                               IBM Corporation
Category: Standards Track                                 M. Chadalapaka
                                                 Hewlett-Packard Company
                                                              J. Hufferd
                                                           Brocade, Inc.
                                                                U. Elzur
                                                                 H. Shah
                                                               P. Thaler
                                                    Broadcom Corporation
                                                            October 2007

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

Status of This Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

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, such as the iWARP protocol suite.  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,
   such as the iWARP protocol suite.

Ko, et al.                  Standards Track                     [Page 1]
RFC 5046                   iSER Specification               October 2007

Table of Contents

   1. Introduction ....................................................5
      1.1. Motivation .................................................5
      1.2. Architectural Goals ........................................6
      1.3. Protocol Overview ..........................................7
      1.4. RDMA Services and iSER .....................................8
           1.4.1. STag ................................................8
           1.4.2. Send ................................................9
           1.4.3. RDMA Write ..........................................9
           1.4.4. RDMA Read ...........................................9
      1.5. SCSI Read Overview ........................................10
      1.6. SCSI Write Overview .......................................10
      1.7. iSCSI/iSER Layering .......................................10
   2. Definitions and Acronyms .......................................11
      2.1. Definitions ...............................................11
      2.2. Acronyms ..................................................17
      2.3. Conventions ...............................................19
   3. Upper Layer Interface Requirements .............................19
      3.1. Operational Primitives Offered by iSER ....................20
           3.1.1. Send_Control .......................................20
           3.1.2. Put_Data ...........................................20
           3.1.3. Get_Data ...........................................21
           3.1.4. Allocate_Connection_Resources ......................21
           3.1.5. Deallocate_Connection_Resources ....................22
           3.1.6. Enable_Datamover ...................................22
           3.1.7. Connection_Terminate ...............................22
           3.1.8. Notice_Key_Values ..................................23
           3.1.9. Deallocate_Task_Resources ..........................23
      3.2. Operational Primitives Used by iSER .......................23
           3.2.1. Control_Notify .....................................24
           3.2.2. Data_Completion_Notify .............................24
           3.2.3. Data_ACK_Notify ....................................24
           3.2.4. Connection_Terminate_Notify ........................25
      3.3. iSCSI Protocol Usage Requirements .........................25
   4. Lower Layer Interface Requirements .............................26
      4.1. Interactions with the RCaP Layer ..........................26
      4.2. Interactions with the Transport Layer .....................27
   5. Connection Setup and Termination ...............................27
      5.1. iSCSI/iSER Connection Setup ...............................27
           5.1.1. Initiator Behavior .................................29

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