netdev - Re: Testing of r8169 workaround removal

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Date:   Sun, 28 Apr 2019 19:39:33 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Neil MacLeod <neil@...cleod.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: Testing of r8169 workaround removal

Hi Neil,

thanks for reporting back. Interesting, then the root cause of the
issue seems to have been in a different corner. On my hardware
I'm not able to reproduce the issue. It's not that relevant with which
exact version the issue vanished. Based on your results I'll just
remove the workaround on net-next (adding your Tested-by).

Heiner


On 28.04.2019 19:30, Neil MacLeod wrote:
> Hi Heiner
> 
> Do you know if this is already fixed in 5.1-rc6 (Linus Torvalds tree),
> as in order to test your request I thought I would reproduce the issue
> with plain 5.1-rc6 with the workaround removed, however without the
> workaround 5.1-rc6 is resuming correctly at 1000Mbps.
> 
> I went back to 4.19-rc4 (which we know is brroken) and I can reproduce
> the issue with the PC (Revo 3700) resuming at 10Mbps, but with 5.1-rc6
> I can no longer reproduce the issue when the workaround is removed.
> 
> I also tested 5.0.10 without the workaround, and again 5.0.10 is
> resuming correctly at 1000Mbps.
> 
> I finally tested 4.19.23 without the workaround (the last iteration of
> this kernel I published) and this does NOT resume correctly at
> 1000Mbps (it resumes at 10Mbps).
> 
> I'll test a few more iterations of 5.0.y to see if I can identify when
> it was "fixed" but if you have any suggestions when it might have been
> fixed I can try to confirm this that - currently it's somewhere
> between 4.19.24 and 5.0.10!
> 
> Regards
> Neil
> 
> 
> 
> 
> On Sun, 28 Apr 2019 at 14:33, Heiner Kallweit <hkallweit1@...il.com> wrote:
>>
>> Hi Neil,
>>
>> you once reported the original issue resulting in this workaround.
>> This workaround shouldn't be needed any longer, but I have no affected HW
>> to test on. Do you have the option to apply the patch below to latest
>> net-next and test link speed after resume from suspend?
>> git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git
>> That would be much appreciated.
>>
>> Heiner
>>
>> ----------------------------------------------------------------
>>
>> After 8c90b795e90f ("net: phy: improve genphy_soft_reset") this
>> workaround shouldn't be needed any longer. However I don't have
>> affected hardware so I can't test it.
>>
>> This was the bug report leading to the workaround:
>> https://bugzilla.kernel.org/show_bug.cgi?id=201081
>>
>> Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
>> ---
>>  drivers/net/ethernet/realtek/r8169.c | 8 --------
>>  1 file changed, 8 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
>> index 383242df0..d4ec08e37 100644
>> --- a/drivers/net/ethernet/realtek/r8169.c
>> +++ b/drivers/net/ethernet/realtek/r8169.c
>> @@ -4083,14 +4083,6 @@ static void rtl8169_init_phy(struct net_device *dev, struct rtl8169_private *tp)
>>         phy_speed_up(tp->phydev);
>>
>>         genphy_soft_reset(tp->phydev);
>> -
>> -       /* It was reported that several chips end up with 10MBit/Half on a
>> -        * 1GBit link after resuming from S3. For whatever reason the PHY on
>> -        * these chips doesn't properly start a renegotiation when soft-reset.
>> -        * Explicitly requesting a renegotiation fixes this.
>> -        */
>> -       if (tp->phydev->autoneg == AUTONEG_ENABLE)
>> -               phy_restart_aneg(tp->phydev);
>>  }
>>
>>  static void rtl_rar_set(struct rtl8169_private *tp, u8 *addr)
>> --
>> 2.21.0
>