Date: Fri, 3 Dec 2004 16:56:06 -0800 From: Bruce M Simpson <bms@spc.org> To: Jose M Rodriguez <josemi@freebsd.jazztel.es> Cc: net@freebsd.org Subject: Re: about a usb adsl modem driver Message-ID: <20041204005606.GF745@empiric.icir.org> In-Reply-To: <200412032125.57063.freebsd@redesjm.local> References: <200412021702.53996.freebsd@redesjm.local> <200412032044.56370.freebsd@redesjm.local> <41B0C569.9070704@freebsd.org> <200412032125.57063.freebsd@redesjm.local>
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On Fri, Dec 03, 2004 at 09:25:56PM +0100, Jose M Rodriguez wrote: > But noted strong differences between atm boards and adsl modems. > > - atm boards are hardware assisted. usb adsl modems are bare assisted. > - atm boards support better signaling, multiple channels, ... usb adsl > modems just one PVC with uni signaling. Not really. See below. > So I realize that try to get a NATM/NETGRAPH hardware driver may be too > work for little gain. Actually writing a NATM driver is far easier than writing a HARP driver. And Harti's newer drivers for ATM cards are, in fact, NATM drivers. You only need to implement Netgraph hooks. You don't need to worry about implementing Netgraph protocol nodes, generally. You might want to contact Benno Rice, he was working on a software AAL5 kernel module to augment netnatm, which would help if you're targeting the lower end ADSL hardware. Regards, BMS
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