Method and apparatus for varying target behavior in a SCSI environment

• US 6,601,119 B1
• Filed: 12/12/2001
• Issued: 07/29/2003
• Est. Priority Date: 12/12/2001
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: LSI Logic Corporation (Broadcom, Inc.)
• Inventors: Gygi, Carl E., Slutz, Mark A., Paulsen, Erik
• Primary Examiner(s): Ray, Gopal C.
• Application Number:
  US10/012,616
• Time in Patent Office: 594 Days
• Field of Search: 710/104, 710/8, 710/315, 710/10, 710/305, 710/11, 710/36, 710/6, 709/301, 709/326, 713/100
• US Class Current: 710/104
• CPC Class Codes: G06F 13/38 Information transfer, e.g. on bus G06F13/14 takes precedence

Abstract

A communications layer is provided between a host-based SCSI initiator and a SCSI target device to fully automate the validation process. The communications layer allows the host to direct variation and modification of the target parameters and behavior using vendor unique commands. The behavioral modification aims to establish interoperability by conforming the behavior of the target to the host behavior. The host-based initiator transports a suitable command structure to the target device containing appropriate ones of the vendor unique commands and associated parameter data. The target executes and otherwise processes the command structure to effectuate a reconfiguration according to the specifics of the command code. The command code is sufficient to fully reconfigure the SCSI target. Accordingly, the reconfiguration process is carried out in a fully automated fashion.

Claims

1. A method for use in combination with a SCSI target and a SCSI initiator, said method comprising the steps of:

defining a command construct including vendor specific commands associated with the SCSI target, the command construct defining an automatic configuration process pertaining to the SCSI target;

the SCSI initiator directing the command construct to the SCSI target; and

the SCSI target processing the command construct to effect automatic configuration thereof in accordance with the command construct.

2. The method as recited in claim 1, wherein the automatic configuration process defined by the command construct facilitates behavioral modification of the SCSI target in a manner sufficient to conform SCSI target behavior to SCSI initiator behavior.

3. The method as recited in claim 1, wherein the automatic configuration process defined by the command construct facilitates selective variation of SCSI target parameters and/or behavior.

4. The method as recited in claim 1, wherein the automatic configuration process defined by the command construct facilitates automatic validation between the SCSI initiator and the SCSI target.

5. The method as recited in claim 1, wherein the command construct including vendor specific microcode executable by the SCSI target.

6. The method as recited in claim 1, wherein the command construct includes a SCSI write command facilitating the download of vendor specific microcode into a memory space of the SCSI target.

7. The method as recited in claim 1, wherein the command construct includes a Command Descriptor Block having vendor specific commands, command-specific parameter values, and/or input data.

8. The method as recited in claim 1, wherein the SCSI initiator being configured as part of a host computer environment.

9. The method as recited in claim 8, further comprises the step of:

invoking a process at the application layer in the host computer environment to direct the SCSI initiator to transport the command construct to the SCSI target.

10. A system, comprising:

a SCSI bus;

a SCSI target operatively connected to said SCSI bus;

a SCSI initiator operatively connected to said SCSI bus; and

an executable code structure associated with said SCSI initiator, the executable code structure defining a target configuration process enabling automatic configuration of said SCSI target.

11. The system as recited in claim 10, wherein said SCSI target being operatively configured to receive and execute the code structure from said SCSI initiator to effect automatic configuration thereof.

12. The system as recited in claim 10, wherein said code structure defines parameters and/or behavior of said SCSI target.

13. The system as recited in claim 10, wherein said code structure including vendor specific commands associated with said SCSI target.

14. The system as recited in claim 10, wherein said code structure includes vendor specific microcode associated with and executable by said SCSI target.

15. The system as recited in claim 14, wherein said SCSI target being configured to receive and store the vendor specific microcode from said SCSI initiator in a behavior configuration space.

16. A computer program product for use in a host computer environment to facilitate communications between an initiator and a target, the host computer environment being configured with the initiator, the computer program product comprising a computer usable medium having computer readable program code thereon, the computer readable program code comprising:

program code for defining a command construct suitable for use in automatically configuring said target; and

program code for directing communication of the command construct to said target to cause automatic configuration of said target in accordance with the command construct.

17. The computer program product as recited in claim 16, wherein the command construct includes vendor specific commands associated with and executable by said target.

18. The computer program product as recited in claim 16, wherein the command construct includes vendor specific microcode loadable into and executable by said target.

19. The computer program product as recited in claim 16, wherein the command construct defining a target behavior sufficient to effectuate compatibility with initiator behavior.

20. The computer program product as recited in claim 16, wherein the command construct defining a target configuration process enabling selective variation of target parameters and/or behavior.