[Bug 256000] [alc] [PATCH] add support for Mikrotik 10/25G NIC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256000

            Bug ID: 256000
           Summary: [alc] [PATCH] add support for Mikrotik 10/25G NIC
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: gatis@mikrotik.com

Created attachment 225085
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=225085&action=edit
patch for the sys/dev/alc driver

[alc] [PATCH] add support for Mikrotik 10/25G NIC

The new Mikrotik 10/25G NIC is mostly compatible with AR8151 hardware,
with few exceptions:

* card supports only 32bit DMA operations
* card does not support write-one-to-clear semantics for interrupt status
  register
* MDIO operations can take longer to complete

This patch adds support for Mikrotik 10/25G NIC to the alc driver
while maintaining support for all earlier HW.

The patch was tested with FreeBSD main branch as of commit
f4b38c360e63a6e66245efedbd6c070f9c0aee55

This was tested on Intel i7-4790K system with Mikrotik 10/25G NIC.
This was tested on Intel i7-4790K system with RB44Ge (AR8151 based 4-port NIC)
to verify backwards compatibility.

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