Is "-vlanhwcsum" without effect? [Was: Re: if_igb(4) VLAN(4) and [RT]XCSUM_IPV6, TSO6

[Harry Schmalzbauer]

 Bezüglich Harry Schmalzbauer's Nachricht vom 06.04.2017 15:25 (localtime):
> Bezüglich Andrey V. Elsukov's Nachricht vom 06.04.2017 14:56 (localtime):
>> On 16.03.2017 21:26, Harry Schmalzbauer wrote:
>>>  Hello,
>>>
>>> I'm wondering if I really loose [RT]XCSUM_IPV6 on if_igb(4) vlan(4)
>>> children.
>>> My igb0 (Kawela, aka 82576) options end with
>>>   "TSO6,VLAN_HWTSO,RXCSUM_IPV6,TXCSUM_IPV6"
>>>
>>> The vlan(4) filtered interfaces show these:
>>>   options=303<RXCSUM,TXCSUM,TSO4,TSO6>
>>>
>>> So TSO6 is inherited, but RC/TXCSUM_IPV6 dropped?
>> Can you test the attached patch?
> Great, thanks for your explanation and the patch. Unfortunately I won't
> be able to test before weekend.  Will report asap.

Hello,

thank you for your fix, which made it into stable/11 in the meantime,
where I can confirm it does work.

But I noticed a possibly related oddity:
Setting "-vlanhwcsum" seems to have no effect, at least ifconfig(8)
reports always 'VLAN_HWCSUM'.
Haven't done any further tests, maybe your eye-brain-connection find the
answer quicker than any test I can do.

thanks,

-harry