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Date: Fri, 13 Jun 2014 18:59:06 -0700 From: Tom Herbert <therbert@...gle.com> To: Joseph Gasparakis <joseph.gasparakis@...el.com> Cc: Linux Netdev List <netdev@...r.kernel.org>, "Brandeburg, Jesse" <jesse.brandeburg@...el.com> Subject: Re: No GSOs to i40e with VXLAN On Fri, Jun 13, 2014 at 5:15 PM, Joseph Gasparakis <joseph.gasparakis@...el.com> wrote: > Hi all, > > I quickly tested VXLAN on i40e with net-next with commit id > f9da455b93f6ba076935b4ef4589f61e529ae046 and the i40e driver has stopped > receiving GSOs even when advertising tx-udp_tnl-segmentation which means > our VXLAN segmentation offload. I am guessing this has something to do > with Tom's recent UDP work but this is just a guess as unfortunatly I > do not have the time to debug this, but I am signing up to review and test > patches fixing this issue. > I verified tunnel offload works properly with bnx2x (I'm using simple vxlan interfaces not OVS). One possibility I can think of is that UDP checksums are somehow enabled. If you're using IPv6 this probably the case (but I assume you're seeing this with IPv4). If checksums are inadvertently enabled somehow in IPv4 this should should up in tcpdump on the Ethernet interface. Thanks, Tom > The driver still gets GSOs with non VXLAN traffic (tested with TCP). > > Thanks > > Joseph -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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