[SCSI] mpt2sas: Added expander phy counter support
Added support to retrieve the invalid_dword_count,
running_disparity_error_count, loss_of_dword_sync_count, and
phy_reset_problem_count for expanders. This will be exported to
attributes within the sas transport layer. A new wrapper function was
added for sending SMP passthru to retrieve the expander phy error log.
Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
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