Date: Sat, 20 Oct 2001 13:23:16 -0700 (PDT) From: Julian Elischer <julian@elischer.org> To: Archie Cobbs <archie@dellroad.org> Cc: Milon Papezik <Milon.Papezik@oskarmobil.cz>, "'hackers@freebsd.org'" <hackers@FreeBSD.ORG>, "'net@freebsd.org'" <net@FreeBSD.ORG> Subject: Re: netgraph one2many question Message-ID: <Pine.BSF.4.21.0110201320240.80678-100000@InterJet.elischer.org> In-Reply-To: <200110201751.f9KHp1584570@arch20m.dellroad.org>
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Bill Paul has written a specific NETGRAPH FEC module... he has failover as well.. (it is only PART a netgraph module as it doesn;t use the netgraph hooks to talk to teh ethernet driver.. (strange)) I suggest you look for it in the archives or on http://www.freebsd.org/~wpaul/ On Sat, 20 Oct 2001, Archie Cobbs wrote: > Milon Papezik writes: > > I would like to extend ng_one2many module to include > > automatic link failure datection, failover and FEC functionality. > > > > My question is: > > Are interface nodes able to send upstream notification > > that their state has changed or do I have to poll their status periodically > > as it is done in ng_fec module made kindly available by wpaul ? > > They don't now, but I think you could add this in a reasonably > unoffensive way. > > What you would do is add a new function pointer to struct ifnet, > say "void (*if_report)(struct ifnet *, int status)" or something. > > When a device driver detected link going up/down, it could call > this function (if non-NULL). Then if_ethersubr() would set this > function pointer to point to some function if_ether_report(). > When if_ether_report() is called, if ng_ether was loaded, it > would call into ng_ether() to generate a control message that > would be passed to the node connected to the "lower" hook. > > Then, ng_one2many could be modified to understand this control > message and do the right thing according to its configuration. > > Or, something like that. Polling might be a quicker and easier > though less precise way to do it for starters. > > -Archie > > __________________________________________________________________________ > Archie Cobbs * Packet Design * http://www.packetdesign.com > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-net" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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