[Bug 284049] mrsas(4) does not expose a /dev/sesX device while mfi(4) does

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=284049

            Bug ID: 284049
           Summary: mrsas(4) does not expose a /dev/sesX device while
                    mfi(4) does
           Product: Base System
           Version: 14.2-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: terry-freebsd@glaver.org

Created attachment 256679
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=256679&action=edit
dmesg extract when booting with mfi(4)

In switching from the mfi(4) to mrsas(4), the backplane on a Dell PowerEdge
R730 with a PERC H730P controller disappears.

Attached are two kernel boot log extracts (grepping for ^ses) from the same
hardware and the same kernel (14.2-STABLE), once with the mfi(4) driver and
once with the mrsas(4) driver, switched with the usual hw.mfi.mrsas_enable=1
tunable in /boot/loader.conf.

Losing the ses device for the main drive backplane means that I cannot monitor
drive stats, so this is more than an inconvenience.

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