Mechanism for error handling of corrupted repeating primitives during frame reception

• US 7,619,984 B2
• Filed: 08/30/2005
• Issued: 11/17/2009
• Est. Priority Date: 08/30/2005
• Status: Expired due to Fees

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Carmichael, Richard D.
• Primary Examiner(s): Rao; Seema S
• Assistant Examiner(s): WONG, XAVIER S
• Application Number:
  US11/215,894
• Publication Number:
  US 20070061681A1
• Time in Patent Office: 1,540 Days
• Field of Search: 370/241, 370/242, 370247-249, 370/252, 370/251, 370/476, 370/506, 714752-780, 714/1, 714/2, 714/47, 714/48, 714/49, 714/50, 714/51, 714/52, 714/53, 714/54, 714/55, 714/56
• US Class Current: 370/252
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 1/1829 Arrangements specially adapted for the receiver end
• CPC Class Codes: H04L 1/201 Frame classification, e.g. bad, good or erased frame indication per se H04L1/0082

Abstract

A method for error handling of corrupted repeating primitives during frame reception is disclosed. The method comprises identifying a portion of a received frame including a repeating primitive sequence, determining whether data in the repeating primitive sequence has one or more errors, and indicating a successful reception of the received frame with the one or more errors in the repeating primitive sequence if the number of errors is less than a determined threshold. Other embodiments are also disclosed.

Claims

1. A method, comprising:

identifying a repeating primitive sequence followed by another primitive within a received frame, the repeating primitive sequence comprising repeated primitives of identical primitive type, the another primitive having a different respective primitive type from the identical primitive type, the another primitive indicating to a receiver of the received frame that data that is between the another primitive and a next succeeding primitive in the received frame is to be ignored by the receiver;

determining whether the data that is between the another primitive and the next succeeding primitive includes one or more errors;

if number of the one or more errors is less than a determined threshold, indicating a successful reception of the received frame despite the one or more errors; and

if an error condition exists in the received frame, indicating, despite the existence of the error condition, that no error exists in the received frame if;

integrity of frame information structure of the received frame is uncompromised by the error condition; and

a primitive control character is uninvolved in the error condition.

2. The method of claim 1, further comprising intervening to attend to the one or more errors if the number of the one or more errors exceeds the determined threshold.

3. The method of claim 2, wherein the intervening further comprises:

abbreviating the received frame; and

flagging the one or more errors.

4. The method of claim 3, further comprising intervening to attend to the one or more errors if the one or more errors involve a corrupted primitive control character.

5. The method of claim 1, wherein the received frame is transmitted using at least one of a Serial Advanced Technology Attachment (SATA) and a Serial Attached Small Computer Systems Interface (SAS) protocol.

6. The method of claim 5, wherein the determined threshold is three errors.

7. The method of claim 1, wherein the one or more errors are at least one of invalid data characters, improper data synchronization, and invalid encoding.

8. An apparatus comprising:

identification circuitry to identify a repeating primitive sequence followed by another primitive within a received frame, the repeating primitive sequence comprising repeated primitives of identical primitive type, the another primitive having a different respective primitive type from the identical primitive type, the another primitive indicating to a receiver of the received frame that data that is between the another primitive and a next succeeding primitive in the received frame is to be ignored by the receiver;

error checking circuitry to determine whether the data that is between the another primitive and the next succeeding primitive includes one or more errors;

processing circuitry to;

process the received frame while ignoring the one or more errors if a number of the one or more errors is less than a determined threshold;

process the received frame while attending to the one or more errors if the number of the one or more errors exceeds the determined threshold; and

if an error condition exists in the received frame, indicate, despite the existence of the error condition, that no error exists in the received frame if;

integrity of frame information structure of the received frame is uncompromised by the error condition; and

a primitive control character is uninvolved in the error condition.

9. The apparatus of claim 8, wherein the received frame is received using at least one of a Serial Advanced Technology Attachment (SATA) and a Serial Attached Small Computer Systems Interface (SAS) protocol.

10. The apparatus of claim 9, wherein the determined threshold is three errors.

11. The apparatus of claim 8, wherein to process the received frame while ignoring the one or more errors further comprises indicating a successful reception of the received frame.

12. The apparatus of claim 11, wherein the attending to the one or more errors occurs if the one or more errors comprises a corrupted primitive control character.

13. A system, comprising:

a storage device;

and a host bus adapter (HBA), coupled to the storage device, having;

frame validation circuitry to;

identify a repeating primitive sequence followed by another primitive within a received frame, the repeating primitive sequence comprising repeated primitives of identical primitive type, the another primitive having a different respective primitive type from the identical primitive type, the another primitive indicating to a receiver of the received frame that data that is between the another primitive and a next succeeding primitive in the received frame is to be ignored by the receiver;

determine whether the data that is between the another primitive and the next succeeding primitive includes one or more errors;

if number of the one or more errors is less than a determined threshold, indicate a successful reception of the received frame despite the one or more errors; and

if an error condition exists in the received frame, indicating, despite the existence of the error condition, that no error exists in the received frame if;

integrity of frame information structure of the received frame is uncompromised by the error condition; and

a primitive control character is uninvolved in the error condition.

14. The system of claim 13, wherein the frame validation circuitry further includes a receive processor to identify the repeating primitive sequence followed by the another primitive within the received frame, determine whether the data includes the one or more errors, and to indicate the successful reception of the received frame.

15. The system of claim 14, wherein the received frame is received using at least one of a Serial Advanced Technology Attachment (SATA) and a Serial Attached Small Computer Systems Interface (SAS) protocol.

16. The system of claim 13, wherein the determined threshold is three errors.

17. Machine-readable memory storing instructions that, when accessed by a machine, cause the machine to perform operations comprising:

identifying a repeating primitive sequence followed by another primitive within a received frame, the repeating primitive sequence comprising repeated primitives of identical primitive type, the another primitive having a different respective primitive type from the identical primitive type, the another primitive indicating to a receiver of the received frame that data that is between the another primitive and a next succeeding primitive in the received frame is to be ignored by the receiver;

determining whether the data that is between the another primitive and the next succeeding primitive includes one or more errors;

processing the received frame while ignoring the one or more errors if the number of errors is less than a determined threshold; and

if an error condition exists in the received frame, indicating, despite the existence of the error condition, that no error exists in the received frame if;

integrity of frame information structure of the received frame is uncompromised by the error condition; and

a primitive control character is uninvolved in the error condition.

18. The machine-readable memory of claim 17, wherein the operations further comprise intervening to attend to the one or more errors if the number of the one or more errors exceeds the determined threshold.

19. The machine-readable memory of claim 18, wherein the intervening further comprises:

abbreviating the received frame; and

flagging the one or more errors.

20. The machine-readable memory of claim 19, wherein the operations further comprise intervening to attend to the one or more errors if a primitive following the data is corrupted.

21. The machine-readable memory of claim 17, wherein the received frame is received using at least one of a Serial Advanced Technology Attachment (SATA) and a Serial Attached Small Computer Systems Interface (SAS) protocol.

22. The machine-readable memory of claim 21, wherein the determined threshold is three errors.