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

[Harry Schmalzbauer]

 Bezüglich Harry Schmalzbauer's Nachricht vom 25.05.2017 19:58 (localtime):
>  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'.

And to complete today's discoverings of personal knwoledge deficiencies:
ifconfig(8) reports "PPROMISC" doubled.
Don't know if that's a special meaning or a cosmetic bug.

Thanks,

-harry