Re: PATCH: VLAN support for 3c59x/3c90x

[Ben Greear]

Alan Cox wrote:
> On Wed, Jul 28, 2004 at 02:33:56PM -0700, Ben Greear wrote:
>
> > > Stefan de Konink ported this code from the 2.4 VLAN patches and tested it
> > > extensively. I cleaned up the ifdefs and fixed a problem with bracketing
> > > that made older cards fail.
> >
> > I am sure this will be appreciated by the VLAN users!
> >
> > Also, do you happen to know how large of an MTU these cards
> > can support?
>
>
> In VLAN mode they support just the extra VLAN bits, with the length
> checking turned off its either FDDI or jumbo frame size but I don't remember
> which. I think FDDI.

So if you try to configure the MTU to 1504 using ifconfig or whatever,
will that actually work?

One reason I ask is that I saw a report of a bug/issue where it was
not possible to send a raw-packet from user space that is bigger than
the MTU.  This would preclude user-space from generating a VLAN packet
with the extra 4 bytes.  Being able to change the MTU would at least
partially work around this issue.

Ben


--
Ben Greear <greearb@xxxxxxxxxxxxxxx>
Candela Technologies Inc  http://www.candelatech.com

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