[Bug 236724] igb(4): Interfaces fail to switch active to inactive state

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236724

--- Comment #19 from commit-hook at freebsd.org ---
A commit references this bug:

Author: marius
Date: Thu Oct 24 14:18:06 UTC 2019
New revision: 354021
URL: https://svnweb.freebsd.org/changeset/base/354021

Log:
  MFC: r353778

  - In em_intr(), just call em_handle_link() instead of duplicating it.
  - In em_msix_link(), properly handle IGB-class devices after the iflib(4)
    conversion again by only setting EM_MSIX_LINK for the EM-class 82574
    and by re-arming link interrupts unconditionally, i. e. not only in
    case of spurious interrupts. This fixes the interface link state change
    detection for the IGB-class. [1]
  - In em_if_update_admin_status(), only re-arm the link state change
    interrupt for 82574 and also only if such a device uses MSI-X, i. e.
    takes advantage of autoclearing. In case of INTx and MSI as well as
    for LEM- and IGB-class devices, re-arming isn't appropriate here and
    setting EM_MSIX_LINK isn't either.
    While at it, consistently take advantage of the hw variable.

  PR:   236724 [1]
  Differential Revision:        https://reviews.freebsd.org/D21924

Changes:
_U  stable/12/
  stable/12/sys/dev/e1000/if_em.c

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