[Bug 260260] igb(4) I35{0,4} parrent <--> vlan jumbo frame mtu mismatch

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From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 15 Dec 2021 16:15:40 UTC

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

--- Comment #4 from Marek Zarychta <zarychtam@plan-b.pwste.edu.pl> ---
I was told to update the PR with some em vs igb details, so TL;DR:
1. em(4) works like before with the same MTU 9000 on parent em(4), lagg(4) and
vlan(4) with the options: VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,VLAN_HWFILTER
enabled.
2. igb(4) doesn't work this way and with options:
VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,VLAN_HWFILTER,VLAN_HWTSO enabled,
the size of vlan(4) MTU has to be lowered by 4 bytes to unbreak receiving jumbo
frames.

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