mrsas: Add big-endian support

[afscoelho_gmail.com]

Summary

Add endiannes conversions in order to support big-endian platforms. Tests were done in a AVAGO Invader SAS Controller (pci vendor=0x1000 device=0x005d). This patch was tested using a Power9 and Intel machines.

Test Plan

Compile and install kernel with changes and see if tools like 'geom disk list' and 'camcontrol inquiry' are able to fetch disk information.

[afscoelho_gmail.com]

Any comment on this?

[luporl]

The changes look good to me overall.

Since you have tested them on an Intel machine and most of them are calls to convert from/to LE, that are no-ops on LE machines, the chance of introducing regressions should be low.

I have just a couple of nitpicks.

sys/dev/mrsas/mrsas.c

910–912

Why was this check removed?

3105

Is there any reason to remove this trace message?

4643–4652

It would be nice to save le16toh(pd_addr->deviceId) to a temporary variable and use it instead of repeating the le16toh() calls.

sys/dev/mrsas/mrsas_fp.c

1339–1340

This comment should be removed.

[afscoelho_gmail.com]

sys/dev/mrsas/mrsas.c

910–912

This check was preventing the driver to continue execution and as it is not present on linux driver 'megaraid' that works on the same card so I removed it from here. I found no issues doing this.

[alfredo]

looks good to me