Date: Fri, 22 Aug 2008 22:43:39 +0100 From: "Bruce M. Simpson" <bms@FreeBSD.org> To: gnn@FreeBSD.org Cc: Luigi Rizzo <rizzo@iet.unipi.it>, net@FreeBSD.org Subject: Re: Small patch to multicast code... Message-ID: <48AF330B.4010802@FreeBSD.org> In-Reply-To: <m2fxowhgq8.wl%gnn@neville-neil.com> References: <m27iaa6v43.wl%gnn@neville-neil.com> <20080821203519.GA51534@onelab2.iet.unipi.it> <m23aky6ncl.wl%gnn@neville-neil.com> <48AE23FF.9070009@FreeBSD.org> <m2tzdd6j36.wl%gnn@neville-neil.com> <48AF08B7.4090804@FreeBSD.org> <m2fxowhgq8.wl%gnn@neville-neil.com>
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gnn@FreeBSD.org wrote: > Somehow the data that the device needs to do the proper checksum > offload is getting trashed here. Now, since it's clear we need a > writable packet structure so that we don't trash the original, I'm > wondering if the m_pullup() will be sufficient. > If it's serious enough to break UDP checksumming on the wire, perhaps we should just swallow the mbuf allocator heap churn and do the m_dup() for now, but slap in a big comment about why it's there. BMS
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