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Creation and use of control information associated with packetized network data by protocol drivers and device drivers
| Details |
Inventors: Hyder, Jameel; Brandon, Kyle;
Assignee: Microsoft Corporation (Redmond, WA)
Primary Examiner: Vu; Viet D.
Assistant Examiner:
Attorney, Agent or Firm: Workman, Nydegger, Seeley
A method, computer program product, and data structure that allows any software component processing network data to communicate control information to and cooperate with another software component by associating control information with a packet of network data. The present invention associates control information with the network data upon which the control information will operate by appending one or more control data structure to a packet descriptor that is common to all software components processing the network data. Furthermore, the control data structure is "tagged" with a class ID value that allows all concerned software components to recognize and utilize the control information. In this manner, any software component may cooperate with and communicate to another software component that processes the network data regardless of any intervening software components. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As used herein, the term "software component" refers to any set of executable instructions separately cognisable to an operating system that manages a computer system.
Examples would include separate processes or threads, application programs, system device drivers, and any other such operating system entity.
As used herein, the term "communications network" is to be interpreted broadly and includes, but is not limited to, local area networks, telecommunications networks, wide area networks, modem connections, etc.
Typically, a communications network will comprise a physical component or physical connection that is made up of the wiring, interface cards and other hardware combined with a specified communications protocol to transmit information from one physical connection to another.
As used herein, the term "driver" refers to software driver programs running in a privileged system environment and that is interact with an I/O subsystem as part of an operating system architecture.
Such drivers are distinguishable from application programs and other software.
As used herein, the term "direct call linkage" refers to a function call interface.
The actual address resolution may be done at compile time through traditional linkers or may be done dynamically by system components when using such entities as dynamic link libraries or export libraries.
An invocation session is created when a subroutine is initially called and ends when that particular subroutine ends.
An Application Programming Interface (API) is a set of subroutines provided by one software component so that relevant services may be uniformly accessed.
As used herein, the term "messaging" refers to sending uniform message blocks between software components in order to communicate therebetween.
One example would be the I/O Request Packet (IRP) structure used in the Windows NT I/O system to communicate between different drivers.
Referring now to FIG.
3 a block diagram is shown illustrating the relationship between the transport protocol driver 100, an integrating component 102, a network card device driver 104, and a network card 108
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