[Bug 233114] [ix] X540 NIC drops link ("no carrier") after several runs of "pktgen -f rx -i ix0"

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233114

            Bug ID: 233114
           Summary: [ix] X540 NIC drops link ("no carrier") after several
                    runs of "pktgen -f rx -i ix0"
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: lev at FreeBSD.org

'82599ES 10-Gigabit SFI/SFP+ Network Connection' with optical SFP+ module
connected to other such card with point-to-point link (no 10G switch inbetween)
drop down link ("status: no carrier") after several runs of nermap's pkt-gen
with receive function ("pkt-gen -f rx -i ix0 -N").

ifconfig ix0 down up doesn't help, only full system reboot helps.

It is 13-CURRENT r34031

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