<<On Tue, 29 Feb 2000 18:59:50 +0100 (CET), Luigi Rizzo <[EMAIL PROTECTED]> said:
> can you clarify this ? Looong ago i used the '586 on a bridge and it did let
> me write the MAC header...
The 82586 has a mode bit which selects one of two possibilities:
1) The transmit command specifies the destination address and
length/ethertype field; the source address is inserted by hardware.
The receive buffer descriptor gets the source address and
length/ethertype.
2) The transmit and receive buffers include a full Ethernet header.
I can't say off the top of my head which the `ie' driver uses, but I
would bet on (2) because that's easier for the driver to deal with.
These sorts of controllers are the reason why ether_input takes the
Ethernet header as a separate parameter.
-GAWollman
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