On 15.12.2015 02:35, Nelson, Shannon wrote:
Using a slightly modified version of udpspam (see diff below - hopefully not mangled by
corporate email servers), where I set the SO_NO_CHECK socket option and can specify a large
buffer size, I can reliably get the following WARN trace. I have reproduced this on both ixgbe
and i40e drivers using "udpspam-no-check <target-ip> 6000".
It looks to me like this is in the Tx path before we get to the actual NIC
drivers, but I may be wrong.
Does UFO offloading on the tunnel interface fix this error?
ethtool -K vxlan ufo off
If yes we can't feed SO_NO_CHECK udp packets into UFO as gso/ufo
requires CHECKSUM_PARTIAL (or add some more logic into the skb or query
socket status from skb_gso_segment).
Thanks,
Hannes
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