Transport mode data transfer between a channel subsystem and input/output devices
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United States of America Patent
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Nov 24, 2015
Grant Date -
Apr 30, 2015
app pub date -
Nov 25, 2014
filing date -
May 29, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
A computer program product is provided for performing a method that includes receiving a command message at a control unit from a channel subsystem in a host computer system, the command message including a command for data to be transferred from the host computer system to an I/O device. The method also includes receiving a data transfer message at the control unit, the data transfer message having an amount of the data to be transferred that is less than or equal to a maximum amount of data, the maximum amount of data corresponding to a number of buffers associated with the control unit and a size of each of the number of buffers, the number of buffers indicated by a buffer credit value maintained in the host computer system, and the size indicated by a buffer size value sent from the control unit and maintained in the host computer system.
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