Re: [PATCH RFC 1/3] xdp: Infrastructure to generalize XDP

On Wed, 21 Sep 2016 13:55:45 +0200, Thomas Graf wrote:

quoted

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.