[Bug 219453] TCP MD5 broken for vlan interfaces created on lagg

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219453

--- Comment #13 from Alexander Motin <mav at FreeBSD.org> ---
I see one problem with my change: when it tries to disable RXCSUM for em0,
since msk0 does not support it, em0 also disables TXCSUM, which lagg does not
notice.  But that should not affect vlan operation, since due to lack of
VLAN_HWCSUM on msk0 none of those flags propagated to vlan0 either before my
change or after.

I'd appreciate some comments here from people knowing how TCP MD5 is working.

Meanwhile, Marek, could you try to manually synchronize the msk0 and em0
interface capabilities (disable rxcsuma and txcsum) to see whether it change
anything.

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