linux-kernel - Re: [PATCH iwl-next v4 0/9] igc: Add support for Frame Preemption feature in IGC

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Message-ID: <20250212220121.ici3qll66pfoov62@skbuf>
Date: Thu, 13 Feb 2025 00:01:21 +0200
From: Vladimir Oltean <vladimir.oltean@....com>
To: Faizal Rahim <faizal.abdul.rahim@...ux.intel.com>
Cc: Tony Nguyen <anthony.l.nguyen@...el.com>,
	Przemek Kitszel <przemyslaw.kitszel@...el.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Simon Horman <horms@...nel.org>,
	Russell King <linux@...linux.org.uk>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	Furong Xu <0x1207@...il.com>,
	Russell King <rmk+kernel@...linux.org.uk>,
	Serge Semin <fancer.lancer@...il.com>,
	Xiaolei Wang <xiaolei.wang@...driver.com>,
	Suraj Jaiswal <quic_jsuraj@...cinc.com>,
	Kory Maincent <kory.maincent@...tlin.com>,
	Gal Pressman <gal@...dia.com>,
	Jesper Nilsson <jesper.nilsson@...s.com>,
	Andrew Halaney <ahalaney@...hat.com>,
	Choong Yong Liang <yong.liang.choong@...ux.intel.com>,
	Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>,
	Vinicius Costa Gomes <vinicius.gomes@...el.com>,
	intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org, bpf@...r.kernel.org
Subject: Re: [PATCH iwl-next v4 0/9] igc: Add support for Frame Preemption
 feature in IGC

On Mon, Feb 10, 2025 at 02:01:58AM -0500, Faizal Rahim wrote:
> Introduces support for the FPE feature in the IGC driver.
> 
> The patches aligns with the upstream FPE API:
> https://patchwork.kernel.org/project/netdevbpf/cover/20230220122343.1156614-1-vladimir.oltean@nxp.com/
> https://patchwork.kernel.org/project/netdevbpf/cover/20230119122705.73054-1-vladimir.oltean@nxp.com/
> 
> It builds upon earlier work:
> https://patchwork.kernel.org/project/netdevbpf/cover/20220520011538.1098888-1-vinicius.gomes@intel.com/
> 
> The patch series adds the following functionalities to the IGC driver:
> a) Configure FPE using `ethtool --set-mm`.
> b) Display FPE settings via `ethtool --show-mm`.
> c) View FPE statistics using `ethtool --include-statistics --show-mm'.
> e) Enable preemptible/express queue with `fp`:
>    tc qdisc add ... root taprio \
>    fp E E P P

Any reason why you are only enabling the preemptible traffic classes
with taprio, and not with mqprio as well? I see there will have to be
some work harmonizing igc's existing understanding of ring priorities
with what Kurt did in 9f3297511dae ("igc: Add MQPRIO offload support"),
and I was kind of expecting to see a proposal for that as part of this.