Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Subject: Re: [Intel-wired-lan] MDI errors during resume from ACPI S3 (suspend
 to ram)
To:     Sasha Neftin <sasha.neftin@intel.com>,
        Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Cc:     Mario Limonciello <mario.limonciello@dell.com>,
        intel-wired-lan@lists.osuosl.org, linux-kernel@vger.kernel.org
References: <81004059-6d91-d8be-c80e-70c52359350d@molgen.mpg.de>
 <2277f25bc44c4aebaac59942de2e24bb@AUSX13MPC105.AMER.DELL.COM>
 <d0aaa0f8-b94c-be65-7a4e-f5592aa65647@intel.com>
From:   Paul Menzel <pmenzel@molgen.mpg.de>
Message-ID: <47977dc7-d53a-427c-bbaa-9c665287cb47@molgen.mpg.de>
Date:   Wed, 7 Aug 2019 16:55:47 +0200
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Dear Sasha,


On 07.08.19 09:23, Neftin, Sasha wrote:
> On 8/6/2019 18:53, Mario.Limonciello@dell.com wrote:
>>> -----Original Message-----
>>> From: Paul Menzel <pmenzel@molgen.mpg.de>
>>> Sent: Tuesday, August 6, 2019 10:36 AM
>>> To: Jeff Kirsher
>>> Cc: intel-wired-lan@lists.osuosl.org; Linux Kernel Mailing List; Limo=
nciello, Mario
>>> Subject: MDI errors during resume from ACPI S3 (suspend to ram)
>>>
>>> Dear Linux folks,
>>>
>>>
>>> Trying to decrease the resume time of Linux 5.3-rc3 on the Dell OptiP=
lex
>>> 5040 with the device below
>>>
>>> =C2=A0=C2=A0=C2=A0=C2=A0 $ lspci -nn -s 00:1f.6
>>> =C2=A0=C2=A0=C2=A0=C2=A0 00:1f.6 Ethernet controller [0200]: Intel Co=
rporation Ethernet Connection (2)
>>> I219-V [8086:15b8] (rev 31)
>>>
>>> pm-graph=E2=80=99s script `sleepgraph.py` shows, that the driver *e10=
00e* takes
>>> around 400 ms, which is quite a lot. The call graph trace shows that
>>> `e1000e_read_phy_reg_mdic()` is responsible for a lot of those. From
>>> `drivers/net/ethernet/intel/e1000e/phy.c` [1]:
>>>
>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 for (i =3D 0; i < (E=
1000_GEN_POLL_TIMEOUT * 3); i++) {
>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 udelay(50);
>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 mdic =3D er32(MDIC);
>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (mdic & E1000_MDIC_READY)
>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
 break;
>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 }
>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (!(mdic & E1000_M=
DIC_READY)) {
>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 e_dbg("MDI Read did not complete\n");
>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 return -E1000_ERR_PHY;
>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 }
>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (mdic & E1000_MDI=
C_ERROR) {
>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 e_dbg("MDI Error\n");
>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 return -E1000_ERR_PHY;
>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 }
>>>
>>> Unfortunately, errors are not logged if dynamic debug is disabled,
>>> so rebuilding the Linux kernel with `CONFIG_DYNAMIC_DEBUG`, and
>>>
>>> =C2=A0=C2=A0=C2=A0=C2=A0 echo "file drivers/net/ethernet/* +p" | sudo=
 tee
>>> /sys/kernel/debug/dynamic_debug/control
>>>
>>> I got the messages below.
>>>
>>> =C2=A0=C2=A0=C2=A0=C2=A0 [ 4159.204192] e1000e 0000:00:1f.6 net00: MD=
I Error
>>> =C2=A0=C2=A0=C2=A0=C2=A0 [ 4160.267950] e1000e 0000:00:1f.6 net00: MD=
I Write did not complete
>>> =C2=A0=C2=A0=C2=A0=C2=A0 [ 4160.359855] e1000e 0000:00:1f.6 net00: MD=
I Error
>>>
>>> Can you please shed a little more light into these errors? Please
>>> find the full log attached.

>>> [1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.g=
it/tree/drivers/net/ethernet/intel/e1000e/phy.c#n206
>>
>> Strictly as a reference point you may consider trying the out-of-tree =
driver to see if these
>> behaviors persist.
>>
>> https://sourceforge.net/projects/e1000/

I can try that in the next days.

> We are using external PHY. Required ~200 ms to complete MDIC
> transaction (depended on the project).

Are you referring to the out-of-tree driver?

> You need to take to consider this time before access to the PHY. I do
> not recommend decrease timer in a 'e1000e_read_phy_reg_mdic()'
> method. We could hit on wrong MDI access.
My point was more, if you know that more time is needed, before the MDI
setting(?) will succeed, why try it anyway and go into the error paths?
Isn=E2=80=99t there some polling possible to find out, when MDI can be se=
t up?


Kind regards,

Paul


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