linux-kernel - Re: [PATCH] wifi: mt76: add tx checksum offload for mt7915, mt7921, mt7981 and mt7986

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Message-ID: <5a529d81-fb4e-4e7a-a132-3b76d26c3696@wp.pl>
Date: Sun, 19 Oct 2025 18:43:47 +0200
From: Aleksander Jan Bajkowski <olek2@...pl>
To: Ben Greear <greearb@...delatech.com>, nbd@....name, lorenzo@...nel.org,
 ryder.lee@...iatek.com, shayne.chen@...iatek.com, sean.wang@...iatek.com,
 matthias.bgg@...il.com, angelogioacchino.delregno@...labora.com,
 howard-yh.hsu@...iatek.com, StanleyYP.Wang@...iatek.com, rosenp@...il.com,
 luoxueqin@...inos.cn, chad@...roe.io, linux-wireless@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH] wifi: mt76: add tx checksum offload for mt7915, mt7921,
 mt7981 and mt7986

Hi Ben,

On 10/19/25 18:26, Ben Greear wrote:
> On 10/19/25 08:51, Aleksander Jan Bajkowski wrote:
>> Supports IPv4 and IPv6 TCP + UDP
>>
>> In various tests between MT7986 and Intel BE200, I observed a 
>> performance
>> boost ranging from 2 to 12%, with an average of 5.5%.
>>
>> I did the tests on the MT7915, MT7981, MT7986, and MT7921 variants. The
>> MT7922, MT7925, and MT799x are untouched for now and still have
>> checksumming disabled.
>
> At least with  7996, tcp csum only worked on the first few vdevs
> created in our testing, so we had to add logic to disable that flag
> on subsequent vdevs.
>
> Have you tried creating a bunch of station and/or vap vdevs to see if
> all of them can still transmit TCP traffic?
>
>
Thanks for the useful information. On all tested devices, I had a single
AP configured per device. I will try to create several APs for each device.

I also have a router with MT7996. A quick test shows that checksum
offload doesn't work on this router. MT7996 is visible in the system
as a single DBDC device. I have 3 APs configured there. Each on a
separate band (2.4/5/6 GHz).

Best regards,
Aleksander