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Method-and-apparatus-for-emulating-ethernet-functionality-over-a-serial-bus

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Method and apparatus for emulating ethernet functionality over a serial bus

Details

Inventors: Joy, Joseph M.; Murching, Arvind; Cleeton, Lawrence R.;
Assignee: Microsoft Corporation (Redmond, WA)
Primary Examiner: Vanderpuye; Kenneth
Assistant Examiner: Nguyen; Van Kim T.
Attorney, Agent or Firm: Banner & Witcoff, Ltd.

The invention allows applications to transparently use a bus, such as the IEEE-1394 serial bus, as if it were an Ethernet (IEEE 802.3). In a conventional Ethernet, each node is assigned a unique 6-byte MAC address in order to receive frames addressed to it over the LAN. According to the invention, IEEE-1394 bus node identifiers are mapped to Ethernet MAC addresses using for example a digital signature algorithm. Ethernet frames are then "wrapped" into 1394 bus packets and addressed to the destination node using the hashed address. The receiver unwraps the 1394 packet and restores the Ethernet frame to its original form. An optimum packet size for transmission of Ethernet packets over the 1394 bus is selected with reference to speed topology maps in the 1394 bus nodes, and this optimum size is transmitted to bus nodes. This packet size is reported to TCP to specify the packet size, and all packets larger than that size are fragmented and reassembled at the receiving node. The protocol works transparently across networks that are linked via bridges.

DETAILED DESCRIPTION The invention allows applications to transparently use a serial bus as if it were an Ethernet.
According to one aspect of the invention, IEEE-1394 bus node identifiers are mapped to MAC addresses using a digital signature function and stored in each bus node.
Each node maintains a list of mappings of MAC addresses to IEEE 1394 identifiers for all the nodes on the IEEE-1394 bus.
Link-layer ARP is used to discover this mapping.
When an application or protocol requests transmission of an Ethernet frame including an IP packet, the transmitting node "wraps" the Ethernet frame in a 1394 bus packet and transmits it to the target node using the node addressing information.
The target node receives the packet and unwraps it to reproduce the original "Ethernet" frame.
According to another aspect of the invention, an optimum packet size for transmission of Ethernet packets over the 1394 bus is selected and broadcast to all bus nodes.
The protocol works transparently across networks linked via bridges, by utilizing abridge channel for traffic destined for nodes external to the local 1394 bus.

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