SYSTEM AND METHOD FOR SCALABLE PROCESSING OF ABORT COMMANDS IN A HOST BUS ADAPTER SYSTEM

• US 20170199667A1
• Filed: 06/09/2016
• Published: 07/13/2017
• Est. Priority Date: 01/08/2016
• Status: Active Grant

• Current Assignee: Oracle International Corporation (Oracle Corporation)
• Original Assignee: Oracle International Corporation (Oracle Corporation)
• Inventors: ZIA, Sajid, KRISHNAMURTHY, Viswa, YEUNG, Louise
• Granted Patent: US 10,423,333 B2
• Time in Patent Office: Days
• CPC Class Codes: G06F 13/385 for adaptation of a particular data processing system to different peripheral devices
• CPC Class Codes: G06F 13/4282 on a serial bus, e.g. I2C bus, SPI bus on daisy chain buses G06F13/4247
• CPC Class Codes: G06F 3/061 Improving I/O performance
• CPC Class Codes: G06F 3/0659 Command handling arrangements, e.g. command buffers, queues, command scheduling
• CPC Class Codes: G06F 3/067 Distributed or networked storage systems, e.g. storage area networks [SAN], network attached storage [NAS]

Abstract

An HBA or proxy HBA device is configured to use separate Abort Buffer and I/O Buffer in each channel thereby allowing parallel queuing of regular I/O commands and Abort commands. Processing of Abort commands is prioritized such that Abort commands can be processed before all I/O commands received before the abort command are processed. The use of parallel queuing of regular I/O commands and Abort commands is of particular advantage in systems where multiple channels may receive abort commands simultaneously in the situation where the multiple channels share a common communication resource. In a particular embodiment the abort processing logic is implemented in a fiber channel adapter card which includes a proxy host bus adapter device which connects multiple HBAs via fiber channel to a storage area network.

Claims

1. A host bus adapter system comprising:

a first processing path for processing abort commands;

a second processing path for processing regular I/O commands;

a selector for selecting commands to be processed;

whereby abort commands and regular I/O commands are processed in parallel and the selector is configured to prioritize processing of abort commands.

2. The host bus adapter system of claim 1 wherein:

the first processing path comprises a first buffer for queuing abort commands and a first register;

the second processing path comprises a second buffer for queuing regular I/O commands and a second register; and

wherein the selector is configured to select aborts commands from the first buffer and I/O commands from the second buffer and is configured to prioritize processing of abort commands.

3. The host bus adapter system of claim 1 wherein:

the first processing path comprises a first ring buffer for queuing abort commands and a first register;

the second processing path comprises a second ring buffer for queuing regular I/O commands and a second register; and

wherein the selector is configured to select abort commands from the first ring buffer and I/O commands from the second ring buffer and is configured to prioritize processing of abort commands.

4. The host bus adapter system of claim 1, wherein:

the host bus adapter system comprises a plurality of channels each comprising a first processing path and a second processing path.

5. The host bus adapter system of claim 1, wherein the host bus adapter system comprises a fiber channel adapter and a proxy host bus adapter.

6. The host bus adapter system of claim 1 wherein:

the host bus adapter system comprises a plurality of channels each comprising a first processing path and a second processing path; and

wherein the host bus adapter system further comprises a router for receiving regular I/O commands and abort commands and directing said commands to a particular channel of the plurality of channels and to one of the first processing and second processing path based on whether the received command is a regular I/O command or an abort command.

7. The host bus adapter system of claim 2, wherein:

said first buffer, said second buffer, said first processing path, said second processing path, and said selector are implemented in hardware.

8. The host bus adapter system of claim 2, wherein:

the host bus adapter system comprises at least 128 of channels each comprising a first processing path and a second processing path.

9. The host bus adapter system of claim 2, wherein:

the host bus adapter system comprises at least 128 of channels each comprising a first processing path and a second processing path; and

said first buffer, said second buffer, said first processing path, said second processing path, and said selector for each of said 128 channels are implemented in hardware.

10. The host bus adapter system of claim 2, wherein:

the host bus adapter system comprises at least 128 of channels each comprising a first processing path and a second processing path;

said first buffer, said second buffer, said first processing path, said second processing path, and said selector for each of said 128 channels are implemented in hardware; and

wherein the host bus adapter system further comprises a router for receiving regular I/O commands and abort commands and directing said commands to a particular channel of the at least 128 channels and to one of the first processing and second processing path of the particular channel based on whether the received command is a regular I/O command or an abort command.

11. A computer-implemented method for supporting abort processing in a host bus adapter system, the method comprising:

providing a first processing path for processing abort commands;

providing a second processing path for processing regular I/O commands;

providing a selector for selecting commands to be processed;

routing received commands to the first processing path if they are abort commands and to the second processing path if they are regular I/O commands;

whereby abort commands and regular I/O commands are processed in parallel and the selector is configured to prioritize processing of abort commands.

12. The method of claim 11 wherein:

providing a first processing path for processing abort commands comprises providing a first buffer for queuing abort commands and a first register;

providing a second processing path for processing regular I/O commands comprises providing a second buffer for queuing regular I/O commands and a second register; and

wherein the method further comprises selecting abort commands from the first buffer and I/O commands from the second buffer using the selector to prioritize processing of abort commands.

13. The method of claim 11 wherein:

providing a first processing path for processing abort commands comprises providing a first ring buffer for queuing abort commands and a first register;

providing a second processing path for processing regular I/O commands comprises providing a second ring buffer for queuing regular I/O commands and a second register; and

wherein the method further comprises selecting abort commands from the first ring buffer and I/O commands from the second ring buffer using the selector to prioritize processing of abort commands.

14. The method of claim 11, further comprising:

providing a plurality of channels each comprising a first processing path and a second processing path.

15. The method of claim 11, further comprising:

providing the host bus adapter system with a fiber channel adapter and a proxy host bus adapter.

16. The method of claim 11 wherein:

providing a plurality of channels each comprising a first processing path and a second processing path; and

providing a router for receiving regular I/O commands and abort commands and directing said commands to a particular channel of the plurality of channels and to one of the first processing and second processing path based on whether the received command is a regular I/O command or an abort command.

17. The method of claim 12, further comprising:

providing at least 128 of channels each comprising a first processing path and a second processing path.

18. The method of claim 12, further comprising:

providing at least 128 of channels each comprising a first processing path and a second processing path wherein said first buffer, said second buffer, said first processing path, said second processing path, and said selector for each of said 128 channels are implemented in hardware.

19. The method of claim 12, further comprising:

providing at least 128 of channels each comprising a first processing path and a second processing path wherein said first buffer, said second buffer, said first processing path, said second processing path, and said selector for each of said 128 channels are implemented in hardware; and

providing a router for receiving regular I/O commands and abort commands;

directing received commands from said router to a particular channel of the at least 128 channels and to one of the first processing and second processing path of the particular channel based on whether the received command is a regular I/O command or an abort command.

20. A non-transitory computer-readable storage medium having stored thereon for supporting abort processing in a host bus adapter system, which instructions, when executed cause the host bus adapter system to perform steps comprising:

providing a first processing path for processing abort commands;

providing a second processing path for processing regular I/O commands;

providing a selector for selecting commands to be processed;

routing received commands to the first processing path if they are abort commands and to the second processing path if they are regular I/O commands;

whereby abort commands and regular I/O commands are processed in parallel and the selector is configured to prioritize processing of abort commands.