Re: if_vlan allow to set incorrect mtu

Reply: Özkan KIRIK : "Re: if_vlan allow to set incorrect mtu"
In reply to: Zhenlei Huang : "Re: if_vlan allow to set incorrect mtu"
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From: Marek Zarychta <zarychtam_at_plan-b.pwste.edu.pl>
Date: Tue, 07 Dec 2021 09:05:45 UTC

W dniu 7.12.2021 o 10:00, Zhenlei Huang pisze:
>> Can you please disable all vlan hardware offloading features and repeat the test again?
>> ifconfig igb0 -vlanmtu -vlanhwtag -vlanhwfilter -vlanhwtso -vlanhwcsum
> Disabling the capabilities listed above doesn't solve the issue, but assigning mtu 8996 to VLAN children does.
> Reproduced on the most recent 13-STABLE (13-n248421-3b936a8c889) while testing the fix[1]
> 
> Try disabling all vlan hardware offloading features in rc.conf.
> 
> ifconfig_igb0="mtu 9000 -vlanmtu -vlanhwtag -vlanhwfilter -vlanhwtso -vlanhwcsum up"
> ifconfig_igb1="mtu 9000 -vlanmtu -vlanhwtag -vlanhwfilter -vlanhwtso -vlanhwcsum up"

It doesn't change anything. I am using workaround since the early 
transition to 13 branch, but recently conducted small investigation and 
finally submitted the PR[1]

[1] https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260260

-- 
Marek Zarychta