Lsi Corporation

Srikiran Dravida

Brian A Day

Parameshwar Ananth Kadekodi

Methods and structures for validating tag information received in SAS frames by any of a plurality of ports comprising a SAS wide port. Each port may have a dedicated transport layer processing element. A tag information table is shared by all of the one or more transport layer processing elements. The tag information table is used to store information regarding a particular tag value being valid for use with a particular device and is updated when the particular tag value is no longer valid for use with the particular device. The information is initially stored in response to transmission of a frame that first uses the particular tag value with the particular device. The tag information table is updated to indicate the particular tag value is no longer valid upon receipt of an appropriate SAS frame or by a processing element external to the one or more transport layer processing elements.

Systems and methods for tag information validation in wide port SAS connections

Methods and structures for assuring proper sequencing of processing of SAS frames received over multiple physical ports of a SAS wide port. A frame scheduler element is communicatively coupled with a SAS transport layer and with a corresponding plurality of link layers operable as a SAS wide port. The frame scheduler receives a request from the transport layer to locate or select a next received frame for further processing. The frame scheduler interacts with the plurality of link layer processing elements having received frames stored within to locate the link layer that has the requested next frame. The frame scheduler then coordinates operation of that link layer and the transport layer to effectuate the transfer of the required next frame.

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Norcross, GA, United States of America

Srikiran Dravida