On Tue, 13 Dec 2016, Hannes Frederic Sowa wrote:
> > Interesting. So you even imagine sockets registering memory regions
> > with the NIC. If we had a proper NIC HW filter API across the drivers,
> > to register the steering rule (like ibv_create_flow), this would be
> > doable, but we don't (DPDK actually have an interesting proposal[1])
>
> On a side note, this is what windows does with RIO ("registered I/O").
> Maybe you want to look at the API to get some ideas: allocating and
> pinning down memory in user space and registering that with sockets to
> get zero-copy IO.
Yup that is also what I think. Regarding the memory registration and flow
steering for user space RX/TX ring please look at the qpair model
implemented by the RDMA subsystem in the kernel. The memory semantics are
clearly established there and have been in use for more than a decade.
