iSCSI Extensions for RDMA Specification
draft-ietf-storm-iser-13

Storage Maintenance (StorM) Working Group                    Michael Ko
Internet Draft                                               Consultant
Intended status: Proposed Standard                  Alexander Nezhinsky
Expires: July 2013                                             Mellanox
Obsoletes: 5046                                        January 17, 2013

                  iSCSI Extensions for RDMA Specification
                       draft-ietf-storm-iser-13.txt

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Abstract

   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.

Ko                        Expires July 2013                  [Page 1]

Internet-Draft            iSER Specification             January 2013

   Table of Contents

   1    Definitions and Acronyms ....................................6
   1.1  Definitions .................................................6
   1.2  Acronyms ...................................................12
   1.3  Conventions ................................................14
   2    Introduction ...............................................15
   2.1  Motivation .................................................15
   2.2  iSCSI/iSER Layering ........................................16
   2.3  Architectural Goals ........................................17
   2.4  Protocol Overview ..........................................17
   2.5  RDMA services and iSER .....................................19
   2.5.1  STag......................................................19
   2.5.2  Send......................................................20
   2.5.3  RDMA Write................................................21
   2.5.4  RDMA Read.................................................21
   2.6  SCSI Read Overview .........................................21
   2.7  SCSI Write Overview ........................................22
   3    Upper Layer Interface Requirements .........................23
   3.1  Operational Primitives offered by iSER .....................23
   3.1.1  Send_Control..............................................24
   3.1.2  Put_Data..................................................24
   3.1.3  Get_Data..................................................24
   3.1.4  Allocate_Connection_Resources.............................25
   3.1.5  Deallocate_Connection_Resources...........................25
   3.1.6  Enable_Datamover..........................................25
   3.1.7  Connection_Terminate......................................26
   3.1.8  Notice_Key_Values.........................................26
   3.1.9  Deallocate_Task_Resources.................................26
   3.2  Operational Primitives used by iSER ........................27
   3.2.1  Control_Notify............................................27
   3.2.2  Data_Completion_Notify....................................27
   3.2.3  Data_ACK_Notify...........................................28
   3.2.4  Connection_Terminate_Notify...............................28
   3.3  iSCSI Protocol Usage Requirements ..........................28
   4    Lower Layer Interface Requirements .........................30
   4.1  Interactions with the RCaP Layer ...........................30
   4.2  Interactions with the Transport Layer ......................31
   5    Connection Setup and Termination ...........................32
   5.1  iSCSI/iSER Connection Setup ................................32
   5.1.1  Initiator Behavior........................................33
   5.1.2  Target Behavior...........................................35
   5.1.3  iSER Hello Exchange.......................................36