netdev - Re: Request for stable backport: stmmac: Use correct values in TQS/RQS fields

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Message-ID: <20190129090955.GA16354@centauri.lan>
Date:   Tue, 29 Jan 2019 10:09:55 +0100
From:   Niklas Cassel <niklas.cassel@...aro.org>
To:     davem@...emloft.net, stable@...r.kernel.org
Cc:     netdev@...r.kernel.org, vinod.koul@...aro.org
Subject: Re: Request for stable backport: stmmac: Use correct values in
 TQS/RQS fields

Adding stable since I see Greg's Sign-off-by on recent backports
to this driver.


On Wed, Dec 19, 2018 at 10:55:16AM +0100, Niklas Cassel wrote:
> Hello David,
> 
> I can observe a netdev watchdog timeout on kernel 4.14.78 when using stmmac
> with multiple tx queues.
> 
> Backporting the following commit:
> 
> commit 52a76235d0c4dd259cd0df503afed4757c04ba1d                                                  
> Author: Jose Abreu <Jose.Abreu@...opsys.com>
> Date:   Fri Oct 13 10:58:36 2017 +0100                                                           
>                                                                                                  
>     net: stmmac: Use correct values in TQS/RQS fields                                            
> 
>     Currently we are using all the available fifo size in RQS and                                
>     TQS fields. This will not work correctly in multi-queues IP's                                
>     because total fifo size must be splitted to the enabled queues.                              
>                                                                                                  
>     Correct this by computing the available fifo size per queue and                              
>     setting the right value in TQS and RQS fields.                                               
>                                                                                                  
>     Signed-off-by: Jose Abreu <joabreu@...opsys.com>                                             
>     Cc: David S. Miller <davem@...emloft.net>                                                    
>     Cc: Joao Pinto <jpinto@...opsys.com>
>     Cc: Giuseppe Cavallaro <peppe.cavallaro@...com>                                              
>     Cc: Alexandre Torgue <alexandre.torgue@...com>                                               
>     Signed-off-by: David S. Miller <davem@...emloft.net>
> 
> 
> resolves the issue.
> 
> The fix was first included in v4.15
> $ git tag --contains 52a76235d0c4dd259cd0df503afed4757c04ba1d
> v4.15
> v4.15-rc1
> v4.15-rc2
> 
> Could you please queue it up for 4.14 stable?
> 
> 
> Kind regards,
> Niklas