Date: Thu, 07 Sep 2006 17:07:25 +0200 From: Andre Oppermann <andre@freebsd.org> To: freebsd-arch@freebsd.org, freebsd-net@freebsd.org Cc: yar@comp.chem.msu.su Subject: Moving ethernet VLAN tags into the mbuf packet header (from mtags) Message-ID: <450035AD.3040600@freebsd.org>
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With the recent addition of a 16bit field for TSO into the mbuf packet header we've got 16bits left over. I've reserved these bits for the ethernet VLAN tagging of packet to do away with the allocated mbuf mtag. The change is rather mechanical. Patch available here: http://people.freebsd.org/~andre/vlan_pkthdr-20060907.diff The big advantage is that we don't have to do a UMA zalloc for very incoming vlan tagged packet. The m_pkthdr.ether_vlan field is always present and its validity depends on the M_VLANTAG flag. Testing & reviews encouraged. :-) -- Andre
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