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

[Willy Tarreau]

Hi Matti,

On Sat, Jul 31, 2004 at 05:12:22PM +0300, Matti Aarnio wrote:
<...> 
> In the receive descriptors there might appear a TL bit (Frame Too Long),
> which is just telling that frame size exceeds 1518 bytes.
> If RW (Receive Watchdog; RDES0<4>) has tripped, then there is at least
> 2048 bytes long frame, most likely longer than 2560 bytes.
> 
> Based on my reading of  ds21143hrm.pdf  (copy of which I have), I do
> think it is safe to just receive larger frames with Tulip, and IGNORE
> the "TL" bit.
> 
> Receiving 1522 byte frames from ethernet with Tulip should be trivial.
> Will that be true with 21140 -- oddly I don't have a copy of 21140 HRM
> in PDF form...  Possibly I got it in paper long ago.

I've just found a document on intel's site comparing 21140 and 21143.
Its reference is 27810701 and its title : "21140-AF to 21143-xD Upgrade".

Since there's nothing about the subject in this document, I assume that
they behave equally. I don't have the time right now, but probably will
during this week-end to make new tests with the doc. For those
interested, the 21143 HRM's reference is 27807401.

Regards,
Willy

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