Determining extended capability of a channel path
First Claim
1. A computer program product for determining extended capability of a channel path in an input/output (I/O) processing system, the computer program product comprising:
- a non-transitory computer-readable storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising;
receiving a request at a channel subsystem in a host computer system from an operating system in the host computer system to provide a channel path description for a channel path, wherein the channel path includes a channel configured to be coupled to a control unit configured to operate and control one or more I/O devices, the channel subsystem configured to direct information flow between memory and the control unit via the channel path; and
outputting from the channel subsystem to the operating system, a channel path description block including the channel path description for the channel path in response to the request, wherein the channel path description block includes;
a descriptor field (DESC) indicating that the channel path supports a Fibre Channel protocol for commanding an I/0 operation; and
an extension support indicator field (F) specifying whether the channel path supports an extension to the Fibre Channel protocol.
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Abstract
A computer program product includes a tangible storage storing instructions for performing a method. The method includes receiving a request at a channel subsystem in a host computer system from an operating system in the host computer system to provide a channel path description for a channel path, the channel subsystem configured to direct information flow between memory and the control unit via the channel path; and outputting from the channel subsystem to the operating system, a channel path description block including the channel path description for the channel path in response to the request. The channel path description block includes: a descriptor field (DESC) indicating that the channel path supports a Fiber Channel protocol for commanding an I/O operation; and an extension support indicator field (F) specifying whether the channel path supports an extension to the Fiber Channel protocol.
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Citations
24 Claims
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1. A computer program product for determining extended capability of a channel path in an input/output (I/O) processing system, the computer program product comprising:
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a non-transitory computer-readable storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising; receiving a request at a channel subsystem in a host computer system from an operating system in the host computer system to provide a channel path description for a channel path, wherein the channel path includes a channel configured to be coupled to a control unit configured to operate and control one or more I/O devices, the channel subsystem configured to direct information flow between memory and the control unit via the channel path; and outputting from the channel subsystem to the operating system, a channel path description block including the channel path description for the channel path in response to the request, wherein the channel path description block includes;
a descriptor field (DESC) indicating that the channel path supports a Fibre Channel protocol for commanding an I/0 operation; andan extension support indicator field (F) specifying whether the channel path supports an extension to the Fibre Channel protocol. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for determining extended capability of a channel path in an input/output (I/O) processing system, the apparatus comprising:
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a channel subsystem in a host computer system for communication with a control unit via a channel path, the channel subsystem including one or more channel paths including one or more channels configured to be coupled to a control unit configured to operate and control one or more I/O devices, the channel subsystem configured to direct information flow between memory and one or more I/O devices via the channel path, the channel subsystem configured to perform a method comprising; receiving a request at the channel subsystem from an operating system in the host computer system to provide a channel path description for the channel path; and outputting from the channel subsystem to the operating system, a channel path description block including the channel path description for the channel path in response to the request, wherein the channel path description block includes; a descriptor field (DESC) indicating that the channel path supports a Fibre Channel protocol for commanding an I/O operation; and an extension support indicator field (F) specifying whether the channel path supports an extension to the Fibre Channel protocol. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method for determining extended capability of a channel path in an input/output (I/O) processing system, the method comprising:
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receiving a request at a channel subsystem in a host computer system from an operating system in the host computer system to provide a channel path description for a channel path, wherein the channel path includes a channel configured to be coupled to a control unit configured to operate and control one or more I/O devices, the channel subsystem configured to direct information flow between memory and the control unit via the channel path; and outputting from the channel subsystem to the operating system a channel path description block including the channel path description for the channel path in response to the request, wherein the channel path description block includes; a descriptor field indicating that the channel path supports a Fibre Channel protocol for commanding an I/O operation; and an extension support indicator field specifying whether the channel path supports an extension to the Fibre Channel protocol. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification