Integrated LAN controller and web server chip

• US 6,373,841 B1
• Filed: 06/22/1998
• Issued: 04/16/2002
• Est. Priority Date: 06/22/1998
• Status: Expired due to Term

• Current Assignee: Hanger Solutions, LLC (IP Investments Group LLC)
• Original Assignee: Agilent Technologies, Inc.
• Inventors: Chou, Paul, Sansguiri, Leena, Kroesen, Ronald, Natarajan, Nandakumar, Dilley, John A., Frid, Marcos, Hyerle, Robert H., Luhrs, Arne, Venkatraman, Chandrasekar, Goh, Dave
• Primary Examiner(s): HSU, ALPUS
• Application Number:
  US09/102,205
• Time in Patent Office: 1,394 Days
• Field of Search: 370/351, 370/389, 370/392, 370/401, 370/463, 709/238, 709/249, 709/250, 709/251, 709/253, 710/107, 710/129
• US Class Current: 370/389
• CPC Class Codes: H04L 41/046 comprising network management agents or mobile agents therefor
• CPC Class Codes: H04L 41/0893 Assignment of logical groups to network elements
• CPC Class Codes: H04L 41/22 comprising specially adapted graphical user interfaces [GUI]
• CPC Class Codes: H04L 67/02 based on web technology, e.g. hypertext transfer protocol [HTTP]

Abstract

A chip for a device such as a computer includes a media access controller and an embedded processor. The embedded processor is programmed to function as a web server and provide network manageability information to a network manager. The embedded processor is also programmed to function as a LAN controller. When a packet is received by the media access controller, the embedded processor examines a destination address of the packet and routes the packet to an appropriate end point. Packets having a first unique destination address are routed to a host interface (and eventually to a host processor), and packets having a second unique address are routed to the embedded processor-functioning-as-web server. Thus, the chip allows network management and local area network communications to be performed over a single physical interface.

Claims

1. A network controller for a device, the device including a host processor, the controller comprising:

a media access controller for accepting packets having unique first and second destination addresses;

a buffer for temporarily buffering the packets accepted by the media access controller;

a host interface;

a dedicated processor programmed to function as a web server, the dedicated processor being further programmed to determine the destination addresses of packets in the buffer, route the packets having the first destination address to the dedicated processor, and route the packets having the second destination address to the host processor;

flash memory including a first plurality of executable instructions and a second plurality of executable instructions, the first plurality of instructions, when executed, instructing the dedicated processor to function as the web server, the second plurality of instructions, when executed, instructing the dedicated processor to read the destination addresses of packets in the buffer and route the packets;

a DRAM for storing the packets having the first destination address; and

a memory interface for the Flash memory and the DRAM.

2. The controller of claim 1, wherein the dedicated processor is programmed to determine the destination address of a packet as the packet is being buffered in the buffer.

3. The controller of claim 1, wherein the buffer includes a MAC Receive buffer for buffering packets received by the media access controller;

and wherein the controller further comprises a MAC Transmit buffer for buffering packets to be sent by the media access controller;

a Host Receive buffer for buffering packets to be sent to the host processor; and

a Host Transmit buffer for buffering packets to be sent by the host processor.

4. The controller of claim 3, further comprising a plurality of DMA engines, responsive to the dedicated processor, for facilitating data communications between the buffers.

5. The controller of claim 4, wherein the dedicated processor is programmable to instruct the DMA engines to facilitate direct communications between the embedded processor and the host processor.

6. The controller of claim 1, wherein the buffer is a MAC Receive buffer, and wherein the controller further comprises a Host Receive buffer, data bus means coupled between the MAC Receive buffer and the Host Receive buffer;

a first DMA engine, responsive to the dedicated processor, for transferring data from the MAC Receive buffer to the data bus means; and

a second DMA engine, responsive to the dedicated processor, for transferring data from the Host Receive Buffer to the host interface.

7. The controller of claim 1, further comprising a Host Transmit buffer;

a data bus means coupled to the Host Transmit buffer;

a first DMA engine, responsive to the dedicated processor, for transferring data from the host interface to the Host Transmit buffer; and

a second DMA engine, responsive to the dedicated processor, for transferring data from the Host Transmit buffer to the data bus.

8. The controller of claim 7, wherein the dedicated processor is programmable to determine a destination of a packet as the packet is being buffered in the Host Transmit buffer.

9. The controller of claim 1, further comprising means for allowing direct communication between the dedicated processor and the host processor.

10. The controller of claim 1, wherein a single chip includes the dedicated processor, the media access controller, the buffer and the memory interface, and wherein the Flash memory and the DRAM are external to the chip.

11. The controller of claim 1, further comprising an interface for an Inter Integrated Circuit bus, and wherein the dedicated processor is coupled to the Inter Integrated Circuit interface, and wherein the dedicated processor is programmable to obtain manageability information about devices coupled to the Inter Integrated Circuit bus and store the manageability information.

12. The controller of claim 1, further comprising an interface for an Inter Integrated Circuit bus, wherein the dedicated processor is coupled to the Inter Integrated Circuit interface, and wherein the dedicated processor is programmable to control devices coupled to the Inter Integrated Circuit bus.

13. The controller of claim 12, wherein at least one of the devices coupled to the bus includes a power supply controller;

and wherein the dedicated processor is programmable to control the power supply controller.

14. The controller of claim 12, wherein at least one of the devices coupled to the bus includes a fan controller, and wherein the dedicated processor is programmable to control the fan controller.

15. The controller of claim 1, wherein the dedicated processor is programmable to be a network manageability web server.