Fibre Channel Framing and Signaling - 4 (FC-FS-4)

Transcription

1 Fibre Channel Framing and Signaling - 4 (FC-FS-4) Rev 1.41 Secretariat: Information Technology Industry Council INCITS working draft proposed American National Standard for Information Technology T11/16-291v0 NOTE: This is a working draft American National Standard of Accredited Standards Committee INCITS. As such this is not a completed standard. The T11 Technical Committee may modify this document as a result of comments received anytime, or during a future public review and its eventual approval as a Standard. Use of the information contained herein is at your own risk. Permission is granted to members of INCITS, its technical committees, and their associated task groups to reproduce this document for the purposes of INCITS standardization activities without further permission, provided this notice is included. All other rights are reserved. Any duplication of this document for commercial or for-profit use is strictly prohibited. POINTS OF CONTACT: Steven L. Wilson (T11 Chair) Claudio DeSanti (T11 Vice Chair) Brocade Cisco Systems 1745 Technology Drive 170 W. Tasman Drive San Jose, CA San Jose, CA Voice: Voice: swilson@brocade.com cds@cisco.com Craig W. Carlson (T11.3 Chair) David Peterson (FC-FS-4 Chair) Craig W. Carlson (FC-FS-4 Editor) QLogic Corporation Brocade QLogic Corporation Whitewater Drive 6000 Nathan Lane North Whitewater Drive Minnetonka, MN Plymouth, MN Minnetonka, MN Voice: Voice: Voice: craig.carlson@qlogic.com david.peterson@brocade.com craig.carlson@qlogic.com i

2 Revision History Rev June 2016 a) Incorporates Editorial comments received by INCITS (see T11/16-067v0). Rev October 2015 a) Incorporates T11 Letter Ballot comment resolutions (see T11/15-054v6). Rev September 2015 a) Incorporates T11 Letter Ballot comment resolutions (see T11/15-054v5). Rev July 2015 a) First draft incorporating T11 Letter Ballot comment resolutions (see T11/15-054v4). Rev August 2014 a) Changes discussed during 8/5/14 FC-FS-4 working group meeting. Rev July 2014 a) Incorporated T11/14-192v1. b) Fixed incorporation errors with v1. c) Incorporated T11/14-196v0. d) Incorporated T11/14-219v0. Rev May 2014 a) Incorporated T11/13-445v0 except for last two comments b) Incorporated T11/14-003v1. c) Incorporated T11/14-097v1. d) Incorporated approved comments from v2. See v3 for remaining open comments. Rev January 2014 a) Incorporated T11/13-369v1 128GFC Architecture Text (approved by work group on 4 December 2013) Rev October 2013 a) Incorporated T11/13-115v4 FC-FS-4 modifications for incorporating 256B/257B transcoding (approved by work group on 7 October 2013) b) Cleaned up change tracking markups from previous revisions. ii

3 Rev March 2013 a) Incorporated T11/13-011v1 Energy Efficient FIbre Channel (approved by work group on 4 February 2013) Rev April 2012 a) Based on ANSI INCITS FC-FS-3 revision 1.11 b) Incorporated T11/11-206v1 CS_CTL and Proirity clarifications for FC-FS-4 (approved by work group on 6 June 2011) c) Incorporated T11/10-430v1 Changes for Sequence ID uniqueness (approved by work group on 1 August 2011) d) Incorporated T11/11-385v2 ABTS enhancement text (approved by work group on 5 December 2011) e) Incorporated T11/11-511v0 SB-5 Abort Codes (approved by work group on 5 December 2011) f) Incorporated T11/12-106v0 with Option 2 Corrections to FC-FS-4 for Dr. Alexandrov (approved by work group 16 April 2012) g) Incorporated T11/12-047v1 Corrections to FC-FS-4 for T11/ (approved by work group 16 April 2012) h) Removed double spaces throughout document iii

4 draft proposed American National Standard for Information Technology Fibre Channel Fibre Channel Framing and Signaling - 4 (FC-FS-4) Secretariat Information Technology Industry Council Approved dd mmmmm, 200x American National Standards Institute, Inc. Abstract This standard describes the framing and signaling requirements for Fibre Channel links. The Physical Interface requirements are described in Fibre Channel-Physical Interfaces (FC-PI-x). The Link Services requirements are described in Fibre Channel-Link Services (FC-LS-3). This standard is recommended for new implementations but does not obsolete the existing Fibre Channel standards. iv

5 American National Standard Approval of an American National Standard requires review by ANSI that the requirements for due process, consensus, and other criteria for approval have been met by the standards developer. Consensus is established when, in the judgement of the ANSI Board of Standards Review, substantial agreement has been reached by directly and materially affected interests. Substantial agreement means much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered, and that a concerted effort be made towards their resolution. The use of American National Standards is completely voluntary; their existence does not in any respect preclude anyone, whether he has approved the standards or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standards. The American National Standards Institute does not develop standards and will in no circumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Standard in the name of the American National Standards Institute. Requests for interpretations should be addressed to the secretariat or sponsor whose name appears on the title page of this standard. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken periodically to reaffirm, revise, or withdraw this standard. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute. PATENT STATEMENT The developers of this standard have requested that holders of patents that may be required for the implementation of the standard disclose such patents to the publisher. However, neither the developers nor the publisher have undertaken a patent search in order to identify which, if any, patents may apply to this standard. As of the date of publication of this standard, following calls for the identification of patents that may be required for the implementation of the standard, notice of one or more such claims has been received. By publication of this standard, no position is taken with respect to the validity of this claim or of any rights in connection therewith. The known patent holder(s) has (have), however, filed a statement of willingness to grant a license under these rights on reasonable and nondiscriminatory terms and conditions to applicants desiring to obtain such a license. Details may be obtained from the publisher. No further patent search is conducted by the developer or publisher in respect to any standard it processes. No representation is made or implied that this is the only license that may be required to avoid infringement in the use of this standard. v

6 Published by American National Standards Institute, Inc. 11 West 42nd Street, New York, NY Copyright 2012 by Information Technology Industry Council (ITI) All rights reserved. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without prior written permission of ITI, 1250 Eye Street NW, Washington, DC Printed in the United States of America vi

7 Table of Contents Contents Page 1 Scope References Qualification and availability of references Approved references References under development Other references Definitions, abbreviations, conventions and keywords Definitions Editorial conventions State machines Overview States State variables State timers State transitions State diagram conventions Abbreviations, acronyms, and symbols Acronyms and other abbreviations Symbols Keywords Structure and Concepts Introduction Functional levels Overview FC-0 general description FC-1 general description FC-2 general description FC-3 general description FC-4 general description Architectural components of nodes Physical model Communication models Topology Types Point-to-point topology Fabric topology Arbitrated Loop topology Classes of service General Class 2 service - multiplex Class 3 service - datagram Class F service - Fabric General Fabric model General Fabric Ports (Fx_Ports) Frame delivery service Generic Services Building Blocks Building block hierarchy vii

8 Frame Sequence Introduction Sequence_Identifier (SEQ_ID) Sequence Status Blocks Exchange Introduction Exchange_Identifiers (OX_ID and RX_ID) Exchange Status Blocks Protocols Primitive Sequence protocols Fabric Login protocol Additional N_Port_ID protocol N_Port Login protocol Data transfer protocol Nx_Port Logout protocol Fabric Logout protocol Segmentation and reassembly of application data Error detection and recovery FC-1 transmission codes Overview B/10B transmission code Overview Notation conventions Valid 8B/10B Transmission Characters Running disparity Generating Transmission Characters Validity of received Transmission Characters B/10B Ordered Sets General B/10B Frame delimiters B/10B Primitive Signals Idle B/10B Primitive Sequences B/66B transmission code Overview B/66B Transmission Word format B/66B scrambling Invalid Synchronization Header Data Transmission Words Control Transmission Words Idle or LPI followed by Idle or LPI Idle followed by SOF EOF followed by Idle or LPI Idle / other Special Function Other Special Function / Idle Other Special Function / other Special Function Other Special Function / SOF SOF / data Data / EOF Receiver error reporting B/66B representation of Special Functions B/66B frame delimiters viii

9 B/66B Primitive Signals B/66B Primitive Sequences B/257B transmission code Overview B/66B to 256B/257B Transcoding Reed-Solomon encoder Scrambler Descrambler Reed-Solomon decoder B/257B to 64B/66B transcoder Transmit Bit Ordering Receive Bit Ordering Transmitter Training Signal Overview Training Frame Training Pattern FEC for 128GFC Overview Functional block diagram B/66B to 256B/257B Transcoder Alignment marker mapping and insertion Reed-Solomon encoder Symbol distribution Transmit bit ordering Alignment lock and deskew Lane reorder Reed-Solomon decoder Alignment marker removal B/257B to 64B/66B transcoder Receive bit ordering FC-1 Transmission Word Synchronization Scope Introduction B/10B Transmission Word Synchronization State Diagram Overview Operational and not operational conditions Transmission Word Synchronization Procedure Bit Synchronization Transmission Word Synchronization detection Introduction Achieving Transmission Word Synchronization B/10B Transmission Word Synchronization for speed negotiation Transmission Word alignment methods Continuous-mode alignment Explicit-mode alignment Loss of Transmission Word Synchronization Introduction Detection of an invalid Transmission Word State transitions Default State Loss of Synchronization state Word Synchronization Acquired states Loss-of-Synchronization procedure ix

10 No Invalid Transmission Word Detected state First Invalid Transmission Word Detected state Second Invalid Transmission Word Detected state Third Invalid Transmission Word Detection state Reset state B/66B Transmission Word Synchronization Overview B/66B Transmission Word Synchronization for speed negotiation Detection of an invalid 64B/66B Transmission Word Transmitter Training Signal Transmission Word Synchronization Introduction Transmitter Training Transmission Word Synchronization for speed negotiation B/257B Transmission Word Synchronization Overview RS-FEC rapid code Word Synchronization process FC_Port state machine Scope Introduction Normal operation states Active State (AC) Link Recovery Link Recovery hierarchy LR Transmit State (LR1) LR Receive State (LR2) LRR Receive State (LR3) Link Failure NOS Receive State (LF1) NOS Transmit State (LF2) Offline General OLS Transmit State (OL1) OLS Receive State (OL2) Wait for OLS State (OL3) Primitive Sequence Protocols Functions Link Initialization Protocol Link Reset Protocol Link Failure Protocol Online-to-offline Protocol Link speed negotiation Scope Speed negotiation overview Link physical architecture and requirements Speed negotiation requirements on L_Ports Primitives Overview GFC speed negotiation GFC speed negotiation Speed negotiation algorithm Algorithm overview Speed Negotiation stage specification conventions Diagramming conventions Terminology x

11 8.6.3 Stage 1 - Wait_for_signal Stage 2 - Negotiate_master and Watchdog timer Stage 3 - Negotiate_follow Optional Stage 5 - Slow_wait Timing requirements Transmitter training Scope Overview Transmitter training state machines Overview Timers Variables Training_Sequencer state machine Overview States Train_Init Train_Lock Train_Local Train_Remote Link_Ready Cn_Controller state machines Overview States Tx_Ready Command Clear GlobalCommand GlobalClear Cn_Responder state machines Overview States Rx_Ready Update Acknowledge Link_Qual_Check state machine Overview States Link_Test Energy Efficient Fibre Channel Overview Energy Efficient Negotiation Energy Efficient Fibre Channel and FEC Alert Signal Transmitter Turn Off LPI Mode Overview LPI Mode Entry LPI Mode Timing Parameters Energy Efficient Fibre Channel State Diagrams Energy Efficient State Variables LPI Mode Transmitter State Diagram LPI Mode Receiver State Diagram xi

12 11 Frame Transmission and Reception Scope General frame format Frame transmission and reception Overview Fill Words Frame Transmission Frame byte order Emission Lowering Protocol Frame Scrambling Start-of-Frame (SOF) delimiter Introduction SOF Initiate (SOFix) Applicability SOF Initiate Class 2 (SOFi2) SOF Initiate Class 3 (SOFi3) SOF Normal (SOFnx) Applicability SOF Normal Class 2 (SOFn2) SOF Normal Class 3 (SOFn3) SOF Fabric (SOFf) End-of-Frame (EOF) delimiter Introduction Valid frame content EOF Normal (EOFn) EOF Terminate (EOFt) Invalid frame content General End of Frame Abort (EOFa) EOF Invalid (EOFni) Frame reception Rules Frame validity Invalid frame processing Frame Content Scope Extended_Headers Frame_Header Data_Field CRC Frame_Header Scope Introduction Routing Control (R_CTL) Introduction ROUTING Field INFORMATION Field Address identifiers (D_ID, S_ID) General Reserved address identifiers Destination_ID (D_ID) Source_ID (S_ID) Class Specific Control (CS_CTL)/Priority xii

13 Introduction CS_CTL Priority Data structure type (TYPE) Frame Control (F_CTL) Introduction Exchange Context Sequence Context First_Sequence Last_Sequence End_Sequence CS_CTL/Priority Enable Sequence Initiative ACK_Form Abort Sequence Condition Relative offset present Exchange reassembly Fill Bytes F_CTL bits on Data frames F_CTL bits on Link_Control frames Sequence_ID (SEQ_ID) Data Field Control (DF_CTL) Sequence count (SEQ_CNT) Originator Exchange_ID (OX_ID) Responder Exchange_ID (RX_ID) Parameter Extended_Headers Scope Introduction VFT_Header and Virtual Fabrics Overview VFT Tagging PN_Port Logical Model Tagging Process VFT_Header Format Inter-Fabric Routing Extended Header (IFR_Header) Overview IFR_Header format Encapsulation Extended Header (Enc_Header) Optional headers Scope Introduction ESP_Header Overview Application of End-to-end ESP_Header processing Application of Link-by-link ESP_Header processing to a frame with an Enc_Header Application of Link-by-link ESP_Header processing to a frame with a VFT_Header Network_Header Device_Header Data frames and responses Scope Data frames Introduction xiii