Date: Thu, 06 Apr 2017 11:26:23 +0200 From: Harry Schmalzbauer <freebsd@omnilan.de> To: Sean Bruno <sbruno@freebsd.org> Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Re: if_igb(4) VLAN(4) and [RT]XCSUM_IPV6, TSO6 Message-ID: <58E609BF.7040205@omnilan.de> In-Reply-To: <939d3920-0181-8b1a-e0be-5d612286daee@freebsd.org> References: <58CAD8CB.3060101@omnilan.de> <939d3920-0181-8b1a-e0be-5d612286daee@freebsd.org>
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Bezüglich Sean Bruno's Nachricht vom 05.04.2017 23:54 (localtime): > > > On 03/16/17 12:26, Harry Schmalzbauer wrote: >> Hello, >> >> I'm wondering if I really loose [RT]XCSUM_IPV6 on if_igb(4) vlan(4) >> children. >> My igb0 (Kawela, aka 82576) options end with >> "TSO6,VLAN_HWTSO,RXCSUM_IPV6,TXCSUM_IPV6" >> >> The vlan(4) filtered interfaces show these: >> options=303<RXCSUM,TXCSUM,TSO4,TSO6> >> >> So TSO6 is inherited, but RC/TXCSUM_IPV6 dropped? … >> > > That looks like a bug. Which version of FreeBSD is this? Thanks for your attention. I'm on RELENG_11. I can confirm that behaviour on r315416 (Mar, 16th). >> In general, how is offloading implemented? If enabled, does the API >> simply generate packets lacking the checksum header and NIC (silicon) >> fills in the checksum if not adviesd not to do so (by the driver)? >> Or is the driver utilizing NIC registers for calculation, but ensures >> every packet will have a checksum? If you know any beginners-level explanations, I was still interested in getting knowledge about offloading implementation. Most important, is it driver/nic dependent or do all drivers implement it similar? Thanks, -harry
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