[Bug 231828] em(4) is unusable after suspend/resume

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231828

            Bug ID: 231828
           Summary: em(4) is unusable after suspend/resume
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: pete at nomadlogic.org

There are several reports that when using an em(4) device on 12-CURRENT the NIC
is unusable until after a reboot or kld_unload/kld_load of the if_em kernel
module.

upon resume there are messages like this in the dmesg buffer:

in6_purgeaddr: err=65, destination address delete failed
lo0: link state changed to DOWN
lo0: link state changed to UP
Link state changed to down
em0: link state changed to DOWN
em0: TX(0) desc avail = 1024, pidx = 0
em0: TX(0) desc avail = 1024, pidx = 0
em0: TX(0) desc avail = 1024, pidx = 0
em0: TX(0) desc avail = 1024, pidx = 0
em0: TX(0) desc avail = 1024, pidx = 0
em0: TX(0) desc avail = 1024, pidx = 0
em0: TX(0) desc avail = 1024, pidx = 0
em0: TX(0) desc avail = 1024, pidx = 0
em0: TX(0) desc avail = 1024, pidx = 0
em0: TX(0) desc avail = 1024, pidx = 0
em0: TX(0) desc avail = 1024, pidx = 0
em0: TX(0) desc avail = 1024, pidx = 0


there is a mailing list thread about the issue here:
https://lists.freebsd.org/pipermail/freebsd-current/2018-September/071408.html


my device info via pciconf:
em0 at pci0:0:31:6:        class=0x020000 card=0x30d017aa chip=0x15b78086 rev=0x31
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Ethernet Connection (2) I219-LM'
    class      = network
    subclass   = ethernet

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