Date: Sun, 10 Dec 2006 10:05:51 -0500 From: "Vishal Patil" <bsd.devil@gmail.com> To: "Julian Elischer" <julian@elischer.org> Cc: =?ISO-8859-1?Q?=D6zkan_KIRIK?= <ozkan@mersin.edu.tr>, freebsd-hackers@freebsd.org Subject: Re: Example network protocol implementation Message-ID: <eb7c8e2e0612100705o199393c4r353b7ff6fb058ed8@mail.gmail.com> In-Reply-To: <457BC490.30904@elischer.org> References: <eb7c8e2e0612091218r61bb72b4q49faee99d85c509d@mail.gmail.com> <20061209.222526.-816359937.imp@bsdimp.com> <457BBCC3.9040605@mersin.edu.tr> <457BC490.30904@elischer.org>
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Would like to thank you all folks. These conversations are really good way of learning things...Also it is good to know different perspectives for solving the same problem.... On 12/10/06, Julian Elischer <julian@elischer.org> wrote: > > =D6zkan KIRIK wrote: > > I think netgraph subsystem provides this infrastructure for implementin= g > > new protocols. > > > > according to netgraph (4) man page: > > > > The aim of *netgraph* is to supplement rather than replace the > existing > > kernel networking infrastructure. It provides: > > > > *=B7* A flexible way of combining protocol and link level drive= rs. > > *=B7* A modular way to implement new protocols. > > *=B7* A common framework for kernel entities to inter-communica= te. > > *=B7* A reasonably fast, kernel-based implementation. > > > > There are many examples and applications at this address: > > http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/netgraph/ > > also look it up in the daemon news archives at: > http://ezine.daemonnews.org/200003/netgraph.html > > a little out of date but the basic ideas are still right. > > > > > > > > you implementation may be "ng_iscsi" :) > > I thought of this but the trick is to do with the locking.. > You would need to get a transfer of control from the > netgraph locking domain to the geom or scsi universe's locking domain. > > There are all the components needed if you consider using the ksocket > netgraph node to open a TCP socket within the kernel, and you could hook > that to a scsi device netgraph node almost directly if you wrote it, > but the hardest part will be to create a method of crossing that locking > divide. > > Still it's possibly worth looking at. Of course the method suggested by > Warner is also very valid and may be about the same amount of work. > > > > > > I hope this helps, > > > > =D6zkan KIRIK > > EnderUNIX SDT @ Turkey > > Software Developer > > > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org= " >
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