Date: Sun, 16 Dec 2001 12:39:46 -0800 From: David Greenman <dg@root.com> To: Andrew Gallatin <gallatin@cs.duke.edu> Cc: rsharpe@ns.aus.com, freebsd-hackers@FreeBSD.ORG Subject: Re: Does anyone know if the Broadcom BCM5700 has problems with HW csum? Message-ID: <20011216123946.A88592@nexus.root.com> In-Reply-To: <15388.48508.65545.403221@grasshopper.cs.duke.edu>; from gallatin@cs.duke.edu on Sun, Dec 16, 2001 at 10:27:56AM -0500 References: <20011214214118.A30560@Odin.AC.HMC.Edu> <3C1AF362.534BD2F7@mindspring.com> <20011215005739.A84861@nexus.root.com> <20011215031304.N79896@elvis.mu.org> <20011215011045.C84861@nexus.root.com> <3C1B32EB.ACBA8DB@mindspring.com> <20011215135635.A86349@nexus.root.com> <3C1BD22F.F3A52BF4@mindspring.com> <20011215150933.B86349@nexus.root.com> <15388.48508.65545.403221@grasshopper.cs.duke.edu>
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> >David Greenman writes: > > >David Greenman wrote: > > >> >In any case, disabling it is what ClickArray ended up doing, as well, > > >> >for the Tigon II, until the firmware could be fixed. > > >> > > >> We're talking about the Tigon III (bge driver for Broadcom BCM5700/BCM5701). > > > > > >Crap. Thanks for the info. > > > > > >Have you manually calculated the checksum on a bad packet to see > > >how it's off? > > > > Yes. It's typically off by 0x1051, but varies depending on the TCP/IP > > header contents. > >Hmm.. Since you've already got the code for calculating the checksum >in the driver written, why not use it? Eg, why not pass the csum up & >set CSUM_DATA_VALID iff the csum ends up being 0? Are you worried that >the firmware will yield false posatives too? Yes, I think it can just as easily return false positives. -DG David Greenman Co-founder, The FreeBSD Project - http://www.freebsd.org President, TeraSolutions, Inc. - http://www.terasolutions.com Pave the road of life with opportunities. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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