Methods and systems for efficient connection of I/O devices to a channel-based switched fabric

A method for interfacing at least one Input/Output (I/O) controller to an adapter, the at least one I/O controller being part of an I/O unit, the adapter providing an interface for the I/O unit to a channel-based switched fabric, comprising:

• executing initialization operations related to the at least one I/O controller and the adapter;
• executing discovery operations related to the at least one I/O controller and the adapter;
• establishing a connection configuration between at least one initiating unit and the I/O unit;
• sending an I/O service request from the at least one initiating unit to the I/O unit;
• transferring at least one of messages and data between the at least one initiating unit and the at least one I/O controller;
• and
• sending an I/O completion message from the at least one I/O unit to the at least one initiating unit after completion of the transferring,
• wherein the first sending, transferring, and second sending occur across a channel-based switched fabric.

A method for interfacing at least one Input/Output (I/O) controller to an adapter, the at least one I/O controller and the adapter being part of an I/O unit, the adapter providing an interface for the at least one I/O controller to a channel-based switched fabric, comprising:

• providing a physical interface between the at least one I/O controller and the adapter, the physical interface being adaptable to the at least one I/O controller;
• defining a set of command primitives, the command primitives communicating commands between the at least one I/O controller and the adapter, the command primitives being transferred between the at least one I/O controller and the adapter via the physical interface;
• providing a unit management service (UMS), the UMS being a part of the adapter, the UMS managing at least one of initialization operations, discovery operations, and connection configuration operations related to at least one of the at least one I/O controller, the adapter, and the I/O unit;
• and
• providing a message and data service (MDS), the MDS being a part of the adapter, the MDS supporting transferring of at least one of messages and data between the at least one I/O controller and at least one initiating unit connected to a channel-based switched fabric.

A system for interfacing at least one Input/Output (I/O) controller to a channel-based switched fabric comprising:

• at least one I/O controller;
• at least one initiating unit connected to a channel-based switched fabric;
• at least one channel adapter, the at least one channel adapter allowing connection of the at least one I/O controller to a channel-based switched fabric, the at least one channel adapter supporting transferring of at least one of messages and data between the at least one I/O controller and the at least one initiating unit;
• and
• a physical interface between the at least one I/O controller and the at least one channel adapter, the physical interface allowing transfer of command primitives that communicate information between the at least one I/O controller and the at least one channel adapter via the physical interface.

An Input/Output (I/O) unit comprising:

• at least one I/O controller;
• at least one channel adapter, the at least one channel adapter allowing connection of the at least one I/O controller to a channel-based switched fabric, the at least one channel adapter supporting transferring of at least one of messages and data between the at least one I/O controller and at least one initiating unit connected to a channel-based switched fabric;
• and
• a physical interface between the at least one I/O controller and the at least one channel adapter, the physical interface allowing transfer of command primitives that communicate information between the at least one I/O controller and the at least one channel adapter via the physical interface.