Date: Tue, 29 Feb 2000 13:07:24 -0500 (EST) From: Garrett Wollman <wollman@khavrinen.lcs.mit.edu> To: Luigi Rizzo <luigi@info.iet.unipi.it> Cc: Julian Elischer <julian@elischer.org>, "Yevmenkin, Maksim N, CSCIO" <myevmenkin@att.com>, "'freebsd-current@freebsd.org'" <freebsd-current@FreeBSD.ORG>, "'freebsd-hackers@freebsd.org'" <freebsd-hackers@FreeBSD.ORG> Subject: Re: NETGRAPH (proposal. FINAL) Message-ID: <200002291807.NAA57238@khavrinen.lcs.mit.edu> In-Reply-To: <200002291759.SAA32145@info.iet.unipi.it> References: <38BC0745.2781E494@elischer.org> <200002291759.SAA32145@info.iet.unipi.it>
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<<On Tue, 29 Feb 2000 18:59:50 +0100 (CET), Luigi Rizzo <luigi@info.iet.unipi.it> 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 -- Garrett A. Wollman | O Siem / We are all family / O Siem / We're all the same wollman@lcs.mit.edu | O Siem / The fires of freedom Opinions not those of| Dance in the burning flame MIT, LCS, CRS, or NSA| - Susan Aglukark and Chad Irschick To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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