Erik Nordmark wrote:
> [EMAIL PROTECTED] wrote:
>
>
>> Everytime the networking code wants to know how long the
>> packet is, it is necessary to call msgdsize() - or similar.
>> In the best cast, this requires a simple bit of pointer arithmetic,
>> but otherwise becomes a linked list walk. Costly.
>>
>
> I think ipha_length works just fine.
> The only exception is where IP needs to verify that the length of the
> received packet is consistent with ipha_length.
>
No, it doesn't.
A lot of device drivers do msgdsize. Some (neptune, I'm looking at
you!) call it *a lot* (repeatedly) on the same packet.
It would be very, very handy to have to full packet (maybe I mean
ethernet frame here) length pre-calculated.
-- Garrett
>
> Erik
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