netdev - Re: [PATCH v2 net-next 2/2] ionic: support sr-iov operations

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Message-ID: <bd7553cd-8784-6dfd-0b51-552b49ca8eaa@pensando.io>
Date:   Thu, 12 Dec 2019 11:59:50 -0800
From:   Shannon Nelson <snelson@...sando.io>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Parav Pandit <parav@...lanox.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>
Subject: Re: [PATCH v2 net-next 2/2] ionic: support sr-iov operations

On 12/12/19 11:52 AM, Jakub Kicinski wrote:
> On Thu, 12 Dec 2019 06:53:42 +0000, Parav Pandit wrote:
>>>   static void ionic_remove(struct pci_dev *pdev)
>>>   {
>>>   	struct ionic *ionic = pci_get_drvdata(pdev);
>>> @@ -257,6 +338,9 @@ static void ionic_remove(struct pci_dev *pdev)
>>>   	if (!ionic)
>>>   		return;
>>>   
>>> +	if (pci_num_vf(pdev))
>>> +		ionic_sriov_configure(pdev, 0);
>>> +
>> Usually sriov is left enabled while removing PF.
>> It is not the role of the pci PF removal to disable it sriov.
> I don't think that's true. I consider igb and ixgbe to set the standard
> for legacy SR-IOV handling since they were one of the first (the first?)
> and Alex Duyck wrote them.
>
> mlx4, bnxt and nfp all disable SR-IOV on remove.

This was my understanding as well, but now I can see that ixgbe and i40e 
are both checking for existing VFs in probe and setting up to use them, 
as well as the newer ice driver.  I found this today by looking for 
where they use pci_num_vf().

sln