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kern/40137: gem(4) drops TCP packets with tcp4csum-tx when on a bridge(4)

>Number:         40137
>Category:       kern
>Synopsis:       gem(4) drops TCP packets with tcp4csum-tx when on a bridge(4)
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Dec 09 07:40:00 +0000 2008
>Originator:     Taylor R Campbell <>
>Release:        NetBSD 4.0_STABLE
System: NetBSD slate.localdomain 4.0_STABLE NetBSD 4.0_STABLE (RIABWI) #35: Sun 
Nov 16 12:42:48 EST 2008 
Architecture: powerpc
Machine: macppc

        (My `RIABWI' kernel contains the bwi(4) driver and enables
        cgd(4), OFB_ENABLE_CACHE, and CAPS_IS_CONTROL; otherwise it is
        identical to GENERIC.  The only bwi(4) interface is down as I
        test this problem.)


        Enabling tcp4csum-tx on a gem(4) interface, and adding that
        interface to a bridge(4), causes the gem(4) interface to drop
        incoming TCP packets.  Neither alone exhibits the problem; only
        the combination of circumstances does.


        On a machine with a gem(4) interface, enable the tcp4csum-tx
        option, create a bridge(4) interface, and add the gem(4)
        interface to it.  Run tcpdump(8) on the gem(4) interface and
        initiate a TCP connection on the gem(4) interface; observe the
        outgoing, but not incoming, TCP packets.


        None known.

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