netdev - Re: Designing a safe RX-zero-copy Memory Model for Networking

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Date:   Tue, 13 Dec 2016 19:39:17 +0100
From:   Hannes Frederic Sowa <hannes@...essinduktion.org>
To:     Jesper Dangaard Brouer <brouer@...hat.com>,
        Christoph Lameter <cl@...ux.com>
Cc:     John Fastabend <john.fastabend@...il.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        Björn Töpel <bjorn.topel@...el.com>,
        "Karlsson, Magnus" <magnus.karlsson@...el.com>,
        Alexander Duyck <alexander.duyck@...il.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Tom Herbert <tom@...bertland.com>,
        Brenden Blanco <bblanco@...mgrid.com>,
        Tariq Toukan <tariqt@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Kalman Meth <METH@...ibm.com>,
        Vladislav Yasevich <vyasevich@...il.com>
Subject: Re: Designing a safe RX-zero-copy Memory Model for Networking

On 13.12.2016 17:10, Jesper Dangaard Brouer wrote:
>> What is bad about RDMA is that it is a separate kernel subsystem.
>> What I would like to see is a deeper integration with the network
>> stack so that memory regions can be registred with a network socket
>> and work requests then can be submitted and processed that directly
>> read and write in these regions. The network stack should provide the
>> services that the hardware of the NIC does not suppport as usual.
> 
> 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.