Method and apparatus for fibre channel identification and retrieval

• US 6,721,320 B1
• Filed: 12/18/1998
• Issued: 04/13/2004
• Est. Priority Date: 12/18/1998
• Status: Expired due to Term

• Current Assignee: NetApp, Inc.
• Original Assignee: LSI Logic Corporation (Broadcom, Inc.)
• Inventors: Rodriguez, Elizabeth G., Odenwald, Louis H. Jr., Hoglund, Timothy E.
• Primary Examiner(s): Nguyen, Steven H. D
• Assistant Examiner(s): Nguyen, Phuongchau Ba
• Application Number:
  US09/216,400
• Time in Patent Office: 1,943 Days
• Field of Search: 370/392, 370/394, 370/400, 370/401, 370/402, 370/403, 370/404, 370/398
• US Class Current: 370/392
• CPC Class Codes: H04L 49/357 Fibre channel switches
• CPC Class Codes: H04L 49/552 by ensuring the integrity of packets received through redundant connections

Abstract

The invention relates to an improved Fiber Channel data management technique. More specifically, this patent relates to an improved scheme for managing the related data in related frames that form a sequence. This patent also generally relates to the management of multiple, active sequences which are simultaneously in transit on a Fiber Channel. This invention provides a means for efficiently locating the sequence status block associated with an arbitrary Fiber Channel sequence by using the source identifier field, the originator exchange identifier field and/or the sequence identifier fields of a Fiber Channel frame header to construct a hash table lookup search.

Claims

1. An apparatus for locating a sequence status block of a Fibre Channel sequence, said apparatus comprising:

(a) a link control module for receiving a plurality of Fibre Channel signals containing the Fibre Channel sequence; and

(b) a receiver logic module for reading a chosen identifier in a frame header of the received Fibre Channel signals, testing validity of the chosen identifier in the frame header of the received Fibre Channel signals, and for hashing the chosen identifier to create a Start-of-list pointer.

2. The apparatus of claim 1 wherein the chosen identifier comprise a sequence identifier.

3. The apparatus of claim 1 wherein the chosen identifier comprises a source identifier.

4. The apparatus of claim 1 wherein the chosen identifier comprises a originator exchange identifier.

5. The apparatus of claim 1 further comprising logic to compare the source identifier, sequence identifier, and originator exchange identifier of the frame header of the received Fibre Channel signals, with the source identifier, sequence identifier, and originator exchange identifier of frame headers in previously received active sequences.