Re: ATM Support.?

[Guy Harris <guy () alum mit edu>]

On Dec 3, 2003, at 11:51 AM, Black, Nathan wrote:

> ATM On Linux. It is a slightly different. and I do not know where to 
> begin.

	'Begin at the beginning,' the King said gravely, 'and go on till you 
come to the end: then stop.'

                                        -Charles L. Dodgson, "Alice in Wonderland"

For Linux ATM, we just punt and run the packet socket in "cooked mode", 
so that what link-layer header is in the packet is discarded *IF* the 
driver and networking stack is correct (and sets the skbuff up 
appropriately), and a "cooked mode" header with an Ethernet type is 
added.  We do that so as to avoid having to infer the traffic type by 
looking at the packet data (SunATM helpfully supplies traffic type 
information in the ATM pseudo-header; as far as I know, if there even 
*is* an ATM pseudo-header with information such as VPI and VCI, it 
doesn't include a traffic type indication).

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