Date: Mon, 13 May 2002 15:38:28 -0700 From: David Greenman-Lawrence <dg@root.com> To: Alfred Perlstein <bright@mu.org> Cc: Terry Lambert <tlambert2@mindspring.com>, Matthew Dillon <dillon@apollo.backplane.com>, jamie@tridentmicrosystems.co.uk, freebsd-hackers@FreeBSD.ORG Subject: Re: Broadcom BCM5701 Chipset problems Message-ID: <20020513153828.A83723@nexus.root.com> In-Reply-To: <20020513205636.GB90188@elvis.mu.org>; from bright@mu.org on Mon, May 13, 2002 at 01:56:36PM -0700 References: <3CDFF60C.48A2EA65@mindspring.com> <20020513102526.H72322@nexus.root.com> <200205131758.g4DHwJFj068941@apollo.backplane.com> <3CE00B14.E8CA43A8@mindspring.com> <200205131901.g4DJ1U8s069604@apollo.backplane.com> <3CE01595.D045B70D@mindspring.com> <20020513124807.R72322@nexus.root.com> <3CE01A3A.AAB85F64@mindspring.com> <20020513130924.W72322@nexus.root.com> <20020513205636.GB90188@elvis.mu.org>
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>* David Greenman-Lawrence <dg@root.com> [020513 13:10] wrote: >> >> The card doesn't drop the packet if the IP/TCP checksum is wrong. In my >> tests, I did a software checksum on the supposedly bad packet, and found it >> to be good every time. So it DMA's correctly, the checksum is just calculated >> incorrectly by the hardware. > >Probably pretty obvious, but adding a flag "if bad hwsum, then try softsum" >probably wouldn't be too hard. Not obvious at all. How do you know if a packet is good or bad without always doing the software checksum? -DG David Greenman-Lawrence Co-founder, The FreeBSD Project - http://www.freebsd.org President, TeraSolutions, Inc. - http://www.terasolutions.com President, Download Technologies, Inc. - http://www.downloadtech.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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