On Wed, 21 Sep 2016 13:55:45 +0200, Thomas Graf wrote: > > I am looking at using this for ILA router. The problem I am hitting is > > that not all packets that we need to translate go through the XDP > > path. Some would go through the kernel path, some through XDP path but > > When you say kernel path, what do you mean specifically? One aspect of > XDP I love is that XDP can act as an acceleration option for existing > BPF programs attached to cls_bpf. Support for direct packet read and > write at clsact level have made it straight forward to write programs > which are compatible or at minimum share a lot of common code. They > can share data structures, lookup functionality, etc.
My very humble dream was that XDP would be transparently offloaded from cls_bpf if program was simple enough. That ship has most likely sailed because XDP has different abort behaviour. When possible though, trying to offload higher-level hooks when the rules don't require access to full skb would be really cool.
