linux-kernel - Re: [net PATCH V3 3/3] cteonxt2-pf: Fix backpressure config for multiple PFC priorities to work simultaneously

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Message-ID: <20230822071707.GK2711035@kernel.org>
Date:   Tue, 22 Aug 2023 09:17:07 +0200
From:   Simon Horman <horms@...nel.org>
To:     Suman Ghosh <sumang@...vell.com>
Cc:     sgoutham@...vell.com, gakula@...vell.com, sbhatta@...vell.com,
        hkelam@...vell.com, lcherian@...vell.com, jerinj@...vell.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [net PATCH V3 3/3] cteonxt2-pf: Fix backpressure config for
 multiple PFC priorities to work simultaneously

On Mon, Aug 21, 2023 at 10:55:16AM +0530, Suman Ghosh wrote:
> MAC (CGX or RPM) asserts backpressure at TL3 or TL2 node of the egress
> hierarchical scheduler tree depending on link level config done. If
> there are multiple PFC priorities enabled at a time and for all such
> flows to backoff, each priority will have to assert backpressure at
> different TL3/TL2 scheduler nodes and these flows will need to submit
> egress pkts to these nodes.
> 
> Current PFC configuration has an issue where in only one backpressure
> scheduler node is being allocated which is resulting in only one PFC
> priority to work. This patch fixes this issue.
> 
> Fixes: 99c969a83d82 ("octeontx2-pf: Add egress PFC support")
> Signed-off-by: Suman Ghosh <sumang@...vell.com>

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