Date: Mon, 29 Mar 2004 21:38:54 +0300 From: Ruslan Ermilov <ru@freebsd.org> To: David Gilbert <dgilbert@dclg.ca> Cc: freebsd-net@freebsd.org Subject: Re: Disabling VLAN_HWTAGGING Message-ID: <20040329183854.GC73842@ip.net.ua> In-Reply-To: <16488.26976.314273.752771@canoe.dclg.ca> References: <200403251118.40718.jbarrett@amduat.net> <20040325234527.GC85417@ip.net.ua> <200403251650.35714.jbarrett@amduat.net> <16488.26976.314273.752771@canoe.dclg.ca>
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[-- Attachment #1 --] On Mon, Mar 29, 2004 at 01:22:24PM -0500, David Gilbert wrote: > >>>>> "Jacob" == Jacob S Barrett <jbarrett@amduat.net> writes: > > Jacob> On Thursday 25 March 2004 03:45 pm, you wrote: > >> > Can you disable VLAN_HWTAGGING? > >> > >> Not without modifying if_nge.c, but it should be pretty trivial. > > Jacob> As trivial as setting chaning: > ifp-> if_capabilities = IFCAP_HWCSUM | IFCAP_VLAN_HWTAGGING; > Jacob> to: > ifp-> if_capabilities = 0; > > Jacob> This didn't solve the problem completely though. On the remote > Jacob> host I can now see tagged frames from the if_nge host, but the > Jacob> reply frames from the if_em host or not visible at all on the > Jacob> if_nge host (via tcpdump). > > Are you dumping all packets? We've found that you can dump a specific > vlan on nge's, but you can't get good data by dumping the raw port > itself. No matter how it's set, in both Linux and FreeBSD, many nge > chipsets will not show vlan packets from the driver with a tcpdump. > Hmm, you can't probably see it because the hardware is configured to do VLAN tag insertion/removal, and stores VLAN data decoupled from the frame's mbuf chain. And BPF is very unlikely to reconstruct the ETHERTYPE_VLAN packet using this information... Cheers, -- Ruslan Ermilov ru@FreeBSD.org FreeBSD committer [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (FreeBSD) iD8DBQFAaG0+Ukv4P6juNwoRAvV/AJ41Nb0ekfQcASKwykLPO6RlEuabzACeKEnp KjP3bN5aRLuiXbQAFzz2Gkk= =k7o0 -----END PGP SIGNATURE-----help
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