linux-kernel - Re: [PATCH net-next v2 3/3] net: stmmac: Set CIC bit only for TX queues with COE

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Message-ID: <20250820085652.5e4aa8cf@kernel.org>
Date: Wed, 20 Aug 2025 08:56:52 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: "G Thomas, Rohan" <rohan.g.thomas@...era.com>
Cc: Rohan G Thomas via B4 Relay
 <devnull+rohan.g.thomas.altera.com@...nel.org>, Andrew Lunn
 <andrew+netdev@...n.ch>, "David S. Miller" <davem@...emloft.net>, Eric
 Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Maxime
 Coquelin <mcoquelin.stm32@...il.com>, Alexandre Torgue
 <alexandre.torgue@...s.st.com>, Serge Semin <fancer.lancer@...il.com>,
 Romain Gantois <romain.gantois@...tlin.com>, Jose Abreu
 <Jose.Abreu@...opsys.com>, Ong Boon Leong <boon.leong.ong@...el.com>,
 netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, Matthew
 Gerlach <matthew.gerlach@...era.com>
Subject: Re: [PATCH net-next v2 3/3] net: stmmac: Set CIC bit only for TX
 queues with COE

On Wed, 20 Aug 2025 08:54:46 -0700 Jakub Kicinski wrote:
> On Wed, 20 Aug 2025 12:44:18 +0530 G Thomas, Rohan wrote:
> > On 8/20/2025 6:52 AM, Jakub Kicinski wrote:  
> > > Hopefully the slight pointer chasing here doesn't impact performance?
> > > XDP itself doesn't support checksum so perhaps we could always pass
> > > false?    
> > 
> > I'm not certain whether some XDP applications might be benefiting from
> > checksum offloading currently  
> 
> Checksum offload is not supported in real XDP, AFAIK, and in AF_XDP 
> the driver must implement a checksum callback which stmmac does not do.
> IOW it's not possible to use Tx checksum offload in stmmac today from
> XDP.

To be clear -- this is just for context. I don't understand the details
of what the CIC bit controls, so the final decision is up to you.