New Driver for MegaRaid 6Gb/s and 12Gb/s Card

[Desai, Kashyap]

> -----Original Message-----
> From: owner-freebsd-scsi at freebsd.org [mailto:owner-freebsd-
> scsi at freebsd.org] On Behalf Of Matthew Jacob
> Sent: Thursday, April 18, 2013 7:13 PM
> To: freebsd-scsi at freebsd.org
> Subject: Re: New Driver for MegaRaid 6Gb/s and 12Gb/s Card
> 
> On 4/17/2013 11:25 PM, Desai, Kashyap wrote:
> > Hope my response clarifies your doubts. ~ Kashyap
> No,  it doesn't.
> 
> What will happen if mrsas and mfi are both compiled into the kernel and
> it boots on a system with the 1st thunderbolt?
> 
> It would be best to have one driver for the same hardware, period.

We are planning to move mfi and mrsas as loadable kernel module, once mrsas driver is submitted. With this, we will provide device.hint tunable option for customer to load mfi vs mrsas for Thunderbolt card.
Best solution is not to have two drivers works with same hardware, but due to development cycle LSI added immediate support for
Thunderbolt card in current mfi driver. Now we have new driver developed for the same card "mrsas".

Customer also wanted to provide choice between mfi vs mrsas for Thunderbolt card until they found "mrsas" is working fine without any major issue for them.
LSI decided based on customer request and they did not wanted to force customers to use "mrsas" driver as immediate effect. There may be some customer who are using "mfi" driver in production environment and do not want to switch to "mrsas" if they upgrade FeeBSD kernel.

This provision of mfi vs mrsas priority is only temporary and in future, we should plan to remove Thunderbolt (Device ID 0x005B) from mfi because LSI will continue new development on "mrsas"

> 
> 
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