Re: if_vlan allow to set incorrect mtu

[Marek Zarychta]

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"

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

--
Marek Zarychta

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]

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