[Bug 231151] ifconfig: unable to disable rxcsum, rxcsum6 and vlanhwcsum on em driver

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231151

--- Comment #3 from Kaho Toshikazu <kaho at elam.kais.kyoto-u.ac.jp> ---
(In reply to Stephen Hurd from comment #2)

> I'll see if I can figure out why r307562 made this change, and come up
> with a  Better Way to twi the two flags together.

I don't know exactly but igb devices are not able to enable/disable rxcsum and
rxcsum6 separately by the hardware level limitation. If only one rxcsum or
rxcsum6 flag is changed, another flag would like to be changed forcefully
to hold same state.

I think iflib should not do a special thing, and it is better that
an individual driver has some workarounds if need.

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