Date: Fri, 7 Sep 2007 16:03:07 -0700 From: "David Christensen" <davidch@broadcom.com> To: "Alfred Perlstein" <alfred@freebsd.org> Cc: FreeBSD Net <freebsd-net@freebsd.org>, Julian Elischer <julian@elischer.org> Subject: RE: FreeBSD discarding received packets > MTU Message-ID: <09BFF2FA5EAB4A45B6655E151BBDD903051CBFCB@NT-IRVA-0750.brcm.ad.broadcom.com> In-Reply-To: <20070907230049.GG87451@elvis.mu.org> References: <46E0632D.8070200@elischer.org> <46E07E74.5020204@elischer.org> <09BFF2FA5EAB4A45B6655E151BBDD9030501D5C0@NT-IRVA-0750.brcm.ad.broadcom.com> <46E0A5DB.3080404@elischer.org> <09BFF2FA5EAB4A45B6655E151BBDD903051CBEB6@NT-IRVA-0750.brcm.ad.broadcom.com> <20070907194749.GD87451@elvis.mu.org> <09BFF2FA5EAB4A45B6655E151BBDD903051CBF54@NT-IRVA-0750.brcm.ad.broadcom.com> <20070907230049.GG87451@elvis.mu.org>
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> > > Internet ettiquette demands being gracious in what you accept. > > > The default policy of FreeBSD is to accept such packets. > > > This is a really weird bug to track down. > > > Other drivers support it. > > >=20 > > > This isn't worth making a stand over, unless you're trying > > > to hold users of YOUR driver hostage. > > >=20 > >=20 > > I'm just being cautious about making changes before I understand > > all of the implications. The driver's current behavior is > > supported by IEEE 802.3 specification (802.3-2005, 4.2.4.2.1) > > and is implemented in the same way for other operating systems > > that are very widely deployed (including Windows and Linux) > > without any reported problems. The existing bge driver which > > was developed for FreeBSD 10 years ago also operates this way, > > so all of my references for porting this driver happen to agree > > on the same implementation. >=20 > Which is all well and good, but the age of a bug does not a feature > make. >=20 > Please think of the four points I raised. >=20 > I think it makes sense to possibly add a "enforce rx mtu" knob > somewhere, but it should likely be turned off. That's the plan. Dave
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