On Mon, Nov 23, 2015 at 3:17 AM, Zang MingJie <zealot0...@gmail.com> wrote:
> Hi
>
> I have set up an environment using ovs 2.4 with ovs shipped datapath
> and kernel 3.14.
>
> When perfing vxlan performance with csum enabled, I found checksum of
> most udp packets are zero, but some are correct value not zero.
>
> This is my vsctl on sender end:
>
> Port "vxlan-0ab49c21"
> Interface "vxlan-0ab49c21"
> type: vxlan
> options: {csum="true", df_default="true", in_key=flow,
> local_ip="10.180.156.34", out_key=flow, remote_ip="10.180.156.33"}
>
> and its dp-flow when doing perf:
>
> $ sudo ovs-dpctl dump-flows
> recirc_id(0),in_port(3),eth(src=fa:16:3e:d8:06:a8,dst=fa:16:3e:7b:22:c1),eth_type(0x0800),ipv4(tos=0/0x3,frag=no),
> packets:11587, bytes:192152422, used:0.001s, flags:P.,
> actions:set(tunnel(tun_id=0x190,src=10.180.156.34,dst=10.180.156.33,ttl=64,flags(df,csum,key))),1
> recirc_id(0),tunnel(tun_id=0x190,src=10.180.156.33,dst=10.180.156.34,ttl=64,flags(-df+csum+key)),in_port(1),skb_mark(0),eth(src=fa:16:3e:7b:22:c1,dst=fa:16:3e:d8:06:a8),eth_type(0x0800),ipv4(frag=no),
> packets:32832, bytes:2332180, used:0.001s, flags:., actions:3
>
> After some investment, finally I found the bug. All udp gso packet
> doesn't have checksum. Here is the patch to fix it:
Thanks a lot for tracking that down. I applied this patch to master
and branch-2.4.
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