From: Benjamin Herrenschmidt <b...@kernel.crashing.org> Date: Wed, 12 Apr 2017 09:36:05 +1000
> I should call the helper when I don't recognize the protocol type in > the IP header, not just when the main skb protocol type is not IP. That's correct. > BTW. I'm not too familiar with how encapsulation works these days. I > wouldn't throw at that HW anything other than unencapsulated packets > for HW checksumming. Is checking skb->protocol to be IP and > ip_hdr(skb)->protocol to be IP, UDP or TCP enough ? IE. Will the latter > especially return the outer header ? If skb->protocol is IP then yes ip_hdr() will point at the outermost header.
