netdev - Re: STMMAC Ethernet Driver support

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Message-ID: <41903b8b-d145-4fdf-a942-79d7f88f9068@electromag.com.au>
Date: Mon, 11 Dec 2023 17:13:07 +0800
From: Richard Tresidder <rtresidd@...ctromag.com.au>
To: Jakub Kicinski <kuba@...nel.org>, vinschen@...hat.com
Cc: netdev@...r.kernel.org
Subject: Re: STMMAC Ethernet Driver support


Richard Tresidder


On 9/12/2023 3:06 pm, Richard Tresidder wrote:
> On 9/12/2023 2:12 am, Jakub Kicinski wrote:
>> On Fri, 8 Dec 2023 14:03:25 +0800 Richard Tresidder wrote:
>>> I've looked through the diffset 6.3.3 >>> 6.6.3 on the driver
>>> drivers\net\ethernet\stmicro\stmmac
>>> But nothing is jumping out at me.
>>>
>>> I could use a pointer as to where to look to start tracing this.
>> Bisection is good way to zero in on the bad change if you don't
>> have much hard to rebase code in your tree.
>>
>> Otherwise you can dump the relevant registers and the descriptors
>> (descriptors_status file in debugfs) and see if driver is doing
>> anything differently on the newer kernel?
>>
> Thanks Jakub
>   Yep I think I'll have to start bisecting things on Monday.
> Luckily to work through this I shouldn't have to merge very much.
> Have a great weekend
>
> Cheers
>   Richard Tresidder
>
Hi Jakub
    Ok the bad commit is the following:
************************************
6b2c6e4a938fece9b539c8085f21d17c5e6eb9de is the first bad commit
commit 6b2c6e4a938fece9b539c8085f21d17c5e6eb9de
Author: Corinna Vinschen <vinschen@...hat.com>
Date:   Mon Apr 17 21:28:45 2023 +0200

     net: stmmac: propagate feature flags to vlan

     stmmac_dev_probe doesn't propagate feature flags to VLANs.  So features
     like offloading don't correspond with the general features and it's not
     possible to manipulate features via ethtool -K to affect VLANs.

     Propagate feature flags to vlan features.  Drop TSO feature because
     it does not work on VLANs yet.

     Signed-off-by: Corinna Vinschen <vinschen@...hat.com>
     Link: 
https://lore.kernel.org/r/20230417192845.590034-1-vinschen@redhat.com
     Signed-off-by: Jakub Kicinski <kuba@...nel.org>

  drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 4 ++++
  1 file changed, 4 insertions(+)
****************************************
 From back in the work for 6.4-rc1

Theres a single line addition  approx line 7506 
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

ndev->vlan_features |= ndev->features;

Commenting this out and things work again.
We're not using VLANs on this interface, or in this system at all.
Also verified I had reenabled tx crc offload during this test.

Cheers
   Richard Tresidder