netdev - Re: [PATCH RESEND net-next 0/2] ntuple filters with RSS

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Message-ID: <20180227154757.4e5f334a@cakuba.netronome.com>
Date:   Tue, 27 Feb 2018 15:47:57 -0800
From:   Jakub Kicinski <kubakici@...pl>
To:     Edward Cree <ecree@...arflare.com>
Cc:     <linux-net-drivers@...arflare.com>,
        David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        "John W. Linville" <linville@...driver.com>,
        Or Gerlitz <gerlitz.or@...il.com>,
        Alexander Duyck <alexander.h.duyck@...el.com>
Subject: Re: [PATCH RESEND net-next 0/2] ntuple filters with RSS

On Tue, 27 Feb 2018 17:59:12 +0000, Edward Cree wrote:
> This series introduces the ability to mark an ethtool steering filter to use
>  RSS spreading, and the ability to create and configure multiple RSS contexts
>  with different indirection tables, hash keys, and hash fields.
> An implementation for the sfc driver (for 7000-series and later SFC NICs) is
>  included in patch 2/2.
> 
> The anticipated use case of this feature is for steering traffic destined for
>  a container (or virtual machine) to the subset of CPUs on which processes in
>  the container (or the VM's vCPUs) are bound, while retaining the scalability
>  of RSS spreading from the viewpoint inside the container.
> The use of both a base queue number (ring_cookie) and indirection table is
>  intended to allow re-use of a single RSS context to target multiple sets of
>  CPUs.  For instance, if an 8-core system is hosting three containers on CPUs
>  [1,2], [3,4] and [6,7], then a single RSS context with an equal-weight [0,1]
>  indirection table could be used to target all three containers by setting
>  ring_cookie to 1, 3 and 6 on the respective filters.

Please, let's stop extending ethtool_rx_flow APIs.  I bit my tongue
when Intel was adding their "redirection to VF" based on ethtool ntuples
and look now they're adding the same functionality with flower :|  And
wonder how to handle two interfaces doing the same thing.

On the use case itself, I wonder how much sense that makes.  Can your
hardware not tag the packet as well so you could then mux it to
something like macvlan offload?

CC: Alex, Or