if_rl VLAN support in RELENG_4

[Sten Daniel Sørsdal]

Dmitry Pryanishnikov wrote:
> 
> Hello!
> 
>   In RELENG_4, RealTek 8129/8139 driver rl(4) doesn't claim VLAN support
> (when I assign vlandev rl0, my vlan device initially gets mtu 1496). In
> modern (e.g. RELENG_6) systems if_rl claims native VLAN support. I've
> tried setting 'ifconfig vlan0 mtu 1500' for rl-based vlan device, and
> resulting interface Just Works (TM) (1500-byte packets trasmit and receive
> correctly via such a vlan). So is it safe to use vlan with 'vlandev rl0'
> and 'mtu 1500' in RELENG_4? Has anyone observed any ill-effects in such
> a configuration? Would it be simple enough for if_rl in RELENG_4 to
> just announce native VLAN support to the system?
> 
> Sincerely, Dmitry

Not necessarily. I would assume, without looking, that you would also
need to enable oversized frame support.

-- 
Sten Daniel Sørsdal