linux-kernel - Re: [PATCH v3] net: ethernet: ti: am65-cpsw-qos: Add Frame Preemption MAC Merge support

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Date:   Wed, 20 Sep 2023 10:20:30 +0300
From:   Roger Quadros <rogerq@...nel.org>
To:     Paolo Abeni <pabeni@...hat.com>, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, vladimir.oltean@....com
Cc:     horms@...nel.org, s-vadapalli@...com, srk@...com, vigneshr@...com,
        p-varis@...com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] net: ethernet: ti: am65-cpsw-qos: Add Frame Preemption
 MAC Merge support



On 19/09/2023 16:13, Paolo Abeni wrote:
> On Mon, 2023-09-18 at 12:53 +0300, Roger Quadros wrote:
>> Add driver support for viewing / changing the MAC Merge sublayer
>> parameters and seeing the verification state machine's current state
>> via ethtool.
>>
>> As hardware does not support interrupt notification for verification
>> events we resort to polling on link up. On link up we try a couple of
>> times for verification success and if unsuccessful then give up.
>>
>> The Frame Preemption feature is described in the Technical Reference
>> Manual [1] in section:
>> 	12.3.1.4.6.7 Intersperced Express Traffic (IET – P802.3br/D2.0)
>>
>> Due to Silicon Errata i2208 [2] we set limit min IET fragment size to 124.
>>
>> [1] AM62x TRM - https://www.ti.com/lit/ug/spruiv7a/spruiv7a.pdf
>> [2] AM62x Silicon Errata - https://www.ti.com/lit/er/sprz487c/sprz487c.pdf
>>
>> Signed-off-by: Roger Quadros <rogerq@...nel.org>
>> ---
>>  drivers/net/ethernet/ti/am65-cpsw-ethtool.c | 150 ++++++++++++
>>  drivers/net/ethernet/ti/am65-cpsw-nuss.c    |   2 +
>>  drivers/net/ethernet/ti/am65-cpsw-nuss.h    |   5 +
>>  drivers/net/ethernet/ti/am65-cpsw-qos.c     | 240 ++++++++++++++++----
>>  drivers/net/ethernet/ti/am65-cpsw-qos.h     | 104 +++++++++
>>  5 files changed, 454 insertions(+), 47 deletions(-)
>>
>> Changelog:
>>
>> v3:
>> - Rebase on top of v6.6-rc1 and mqprio support [1]
> 
> I'm unsure if this will require a rebase for the next revision of the
> mqprio support. Anyhow the two patches are related, it's probably
> better bundle them in a series so that the dep is straight-forward.

Good idea.

> 
> When reposting, please insert the target tree in the subject profix
> (net-next in this case).

My bad. I will add. Thanks.

-- 
cheers,
-roger