netdev - Re: [PATCH] igb: Fix igb_down hung on surprise removal

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Message-ID: <52cfebaf-79f6-c318-c14b-3716555d0e8f@intel.com>
Date: Tue, 23 May 2023 11:03:51 -0700
From: Tony Nguyen <anthony.l.nguyen@...el.com>
To: Grant Grundler <grundler@...omium.org>, Pavan Chebbi
	<pavan.chebbi@...adcom.com>, Aleksandr Loktionov
	<aleksandr.loktionov@...el.com>, "Neftin, Sasha" <sasha.neftin@...el.com>,
	"Ruinskiy, Dima" <dima.ruinskiy@...el.com>
CC: Ying Hsu <yinghsu@...omium.org>, <netdev@...r.kernel.org>, "David S.
 Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, "Jakub
 Kicinski" <kuba@...nel.org>, Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Paolo Abeni <pabeni@...hat.com>, <intel-wired-lan@...ts.osuosl.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] igb: Fix igb_down hung on surprise removal

On 5/22/2023 1:16 PM, Grant Grundler wrote:
> On Thu, May 18, 2023 at 3:36 AM Pavan Chebbi <pavan.chebbi@...adcom.com> wrote:
>>
>> On Thu, May 18, 2023 at 12:58 PM Ying Hsu <yinghsu@...omium.org> wrote:
>>>
>>> diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
>>> index 58872a4c2540..a8b217368ca1 100644
>>> --- a/drivers/net/ethernet/intel/igb/igb_main.c
>>> +++ b/drivers/net/ethernet/intel/igb/igb_main.c
>>> @@ -9581,6 +9581,11 @@ static pci_ers_result_t igb_io_error_detected(struct pci_dev *pdev,
>>>          struct net_device *netdev = pci_get_drvdata(pdev);
>>>          struct igb_adapter *adapter = netdev_priv(netdev);
>>>
>>> +       if (state == pci_channel_io_normal) {
>>> +               dev_warn(&pdev->dev, "Non-correctable non-fatal error reported.\n");
>>> +               return PCI_ERS_RESULT_CAN_RECOVER;
>>> +       }
>>> +
>>
>> This code may be good to have. But not sure if this should be the fix
>> for igb_down() synchronization.
> 
> I have the same opinion. This appears to solve the problem - but I
> don't know if there is a better way to solve this problem.
> 
>> Intel guys may comment.
> 
> Ping? Can we please get feedback from IGB/IGC maintainers this week?
> 
> (I hope igc maintainers can confirm this isn't an issue for igc.)

Adding some of the igb and igc developers.

> cheers,
> grant
> 
>>
>>>          netif_device_detach(netdev);
>>>
>>>          if (state == pci_channel_io_perm_failure)
>>> --
>>> 2.40.1.606.ga4b1b128d6-goog
>>>
>>>