> This patch assumes that the bnx2x hardware will ignore existing IPv4/v6 header > fields for length and checksum as well as the length and checksum fields for > outer UDP and GRE headers. > > I have no means of testing this as I do not have any bnx2x hardware but > thought > I would submit it as an RFC to see if anyone out there wants to test this and > see > if this does in fact enable this functionality allowing us to to segment > tunneled > frames that have an outer checksum. > > Signed-off-by: Alexander Duyck <adu...@mirantis.com>
So it took me some [well, a lot] time to reach this, but I've finally gave it a try. I saw a performance boost with the partial support - Throughput for vxlan tunnels with and without udpcsum were almost identical after this, whereas without this patch the udpcsum prevented GSO and a TCP/IPv4 connection on top of it got roughly half the throughput. However, I did encounter one oddity I couldn't explain - After I've disabled tx-udp_tnl-segmentation via ethtool on the base interface, got left with: tx-gso-partial: on tx-udp_tnl-segmentation: off tx-udp_tnl-csum-segmentation: on When I ran traffic over both vxlan tunnels the one with the udpcsum was still Passing gso aggregations to base device to transmit [and the throughput was same as before], where's the tunnel without the udpcsum showed only MTU-sized packets reaching the base interface for transmission [which is what I've expected] Any idea why that happened?
