Call For Testing: Add TSO support for em(4)

Author:
Source

In a recent message to tech@,
Marcus Glocker (mglocker@), asks users running -current for
testing of a potenially performance enhancing diff:

List:       openbsd-tech
Subject:    Add TSO support for em(4)
From:       Marcus Glocker <marcus () nazgul ! ch>
Date:       2023-12-21 22:42:39

As already discussed with claudio@ and Paul over chat.

This diff adds TSO support for the em(4) 82575, 82576, 82580, I350, and
I210 chip sets.  This is more or less and adaption from what the FreeBSD
driver does.

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