>>>>> "Sreekanth" == Sreekanth Reddy <sreekanth.re...@avagotech.com> writes:

Hey Sreekanth,

Sreekanth> If we have single driver approach, making any changes in
Sreekanth> driver require lots of regression and Q/A cycle so that
Sreekanth> existing customer who are based on older controller does not
Sreekanth> have any impact due some fixes/new features.

Sreekanth> With all these HBA specific features, it is unmanageable to
Sreekanth> have a common driver for SAS2 and SAS3 HBAs.

But just as a counterexample to that: qla2xxx and lpfc are both capable
of driving a wide range of chip generations and firmware interface
versions with a single driver.

The problem I have with the mpt2sas/mpt3sas split is that there are way
more commonalities than there are differences. It is trivial to handle
multiple scatterlist format and features in a single driver. You guys
already do that in megaraid_sas.

-- 
Martin K. Petersen      Oracle Linux Engineering
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