* Handling ordered tags
@ 2005-03-28 21:45 Brian King
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From: Brian King @ 2005-03-28 21:45 UTC (permalink / raw)
To: linux-scsi
I'm trying to understand all the implications of allowing ordered tags
for a SCSI LLD, especially when running QERR=0 with autosense and no ACA.
Are any of these problems a concern given how ordered tags are used in Linux?
1. If an ordered tag is sent and a previously sent simple tagged op completes
with a failure, the ordered tag will still execute.
2. If an ordered tag is sent and completes with a failure, any simple tags sent
after it will execute.
I guess my bigger question is, are there any additional requirements on an LLD
in order for it to support ordered tags? Can the LLD send back responses in any
order?
Thanks
--
Brian King
eServer Storage I/O
IBM Linux Technology Center
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2005-03-28 21:45 Handling ordered tags Brian King
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