On 2001-Jun-25 14:25:42 -0500, Jonathan Lemon <[EMAIL PROTECTED]> wrote:
>On Mon, Jun 25, 2001 at 11:02:55PM +0400, Yar Tikhiy wrote:
>> Hi there,
>>
>> While more and more Ethernet NIC drivers start supporting long
>> frames (>1518 bytes), the user/admin still cannot raise MTU on an
>> Ethernet interface above the 1500 byte limit due to outdated code
>> in net/if_ethersubr.c
[patch removed]
>I'm not at all sure how this change will help anything, unless each
>driver alters if_hdrlen.
One benefit is for 802.1Q VLAN support - the existence of lots of
hard-wired values that restrict frames to 1518 bytes makes configuring
VLAN's a pain. It would be nice if attaching a vlan(4) to a driver that
handled 1522 byte frames resulted in a 1500 byte MTU on the vlan.
> Drivers which actually are able
>to handle a larger mtu (e.g: 9000 byte Jumbograms) already have to do
>their own checks, and thus don't call this function.
IMHO, it would be nicer if more of the checking was centralised, rather
than each driver repeating the same checks.
Peter
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