netdev - Re: [PATCH iwl-next v3] igc: Add MQPRIO offload support

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Message-ID: <20240701071508.GD17134@kernel.org>
Date: Mon, 1 Jul 2024 08:15:08 +0100
From: Simon Horman <horms@...nel.org>
To: Kurt Kanzenbach <kurt@...utronix.de>
Cc: Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Tony Nguyen <anthony.l.nguyen@...el.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	"shenjian (K)" <shenjian15@...wei.com>,
	Vinicius Costa Gomes <vinicius.gomes@...el.com>,
	intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org
Subject: Re: [PATCH iwl-next v3] igc: Add MQPRIO offload support

On Fri, Jun 21, 2024 at 09:25:55AM +0200, Kurt Kanzenbach wrote:
> Add support for offloading MQPRIO. The hardware has four priorities as well
> as four queues. Each queue must be a assigned with a unique priority.
> 
> However, the priorities are only considered in TSN Tx mode. There are two
> TSN Tx modes. In case of MQPRIO the Qbv capability is not required.
> Therefore, use the legacy TSN Tx mode, which performs strict priority
> arbitration.
> 
> Example for mqprio with hardware offload:
> 
> |tc qdisc replace dev ${INTERFACE} handle 100 parent root mqprio num_tc 4 \
> |   map 0 0 0 0 0 1 2 3 0 0 0 0 0 0 0 0 \
> |   queues 1@0 1@1 1@2 1@3 \
> |   hw 1
> 
> The mqprio Qdisc also allows to configure the `preemptible_tcs'. However,
> frame preemption is not supported yet.
> 
> Tested on Intel i225 and implemented by following data sheet section 7.5.2,
> Transmit Scheduling.
> 
> Signed-off-by: Kurt Kanzenbach <kurt@...utronix.de>

Reviewed-by: Simon Horman <horms@...nel.org>