On Thu, Jan 11, 2018 at 09:47:16PM +0100, Thomas Boros wrote:
> for my PhD studies Im implementing a new action, which modifies the
> sequence number in the TCP header. I’ve managed to add the action,
> however the action is applied only on the first packet. I’ve disabled
> the kernel datapath during this development, however I have no idea
> where to make changes to apply my modification on the fast path. I
> see, when a first packet arrives a cache miss occurs in the
> fast_path_processing (file lib/dpif-netdev.c). Could you give some
> hints how to implement my custom action, so it will modify packets on
> the fast_path too? Or how the switch behaves when the kernel module is
> enabled? Do the packet processing goes through the fast_path or
> remains in the kernel datapath?

Did you implement the action as a datapath action and make the
translation code in ofproto-dpif-xlate emit that datapath action?
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