[Bug 253583] igb(4) double counting ingress traffic

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253583

            Bug ID: 253583
           Summary: igb(4) double counting ingress traffic
           Product: Base System
           Version: 13.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: amigan at gmail.com

Appears to be a recurrence of
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220198

On stable/13-n244514-18097ee2fb7c, ingress packets on igb(4) are counting
doubly. Using the same methodology as in 220198 (comparing iftop to systat
-if), I am seeing this behavior. See also
https://lists.freebsd.org/pipermail/freebsd-current/2021-February/078825.html.

My machine is a Protectli Vault 4 with 4x I210 interfaces.

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