netdev - Re: [PATCH net-next v6 3/8] net/funeth: probing and netdev ops

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Date:   Wed, 16 Feb 2022 19:06:18 -0800
From:   Dimitris Michailidis <d.michailidis@...gible.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH net-next v6 3/8] net/funeth: probing and netdev ops

On Wed, Jan 12, 2022 at 2:51 PM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Sun,  9 Jan 2022 17:56:31 -0800 Dimitris Michailidis wrote:
> > +static int funeth_sriov_configure(struct pci_dev *pdev, int nvfs)
> > +{
> > +     struct fun_dev *fdev = pci_get_drvdata(pdev);
> > +     struct fun_ethdev *ed = to_fun_ethdev(fdev);
> > +     int rc;
> > +
> > +     if (nvfs == 0) {
> > +             if (pci_vfs_assigned(pdev)) {
> > +                     dev_warn(&pdev->dev,
> > +                              "Cannot disable SR-IOV while VFs are assigned\n");
> > +                     return -EPERM;
> > +             }
> > +
> > +             pci_disable_sriov(pdev);
> > +             fun_free_vports(ed);
> > +             return 0;
> > +     }
> > +
> > +     rc = fun_init_vports(ed, nvfs);
> > +     if (rc)
> > +             return rc;
>
> Also likely needs locking, not that sriov callback is called with
> device lock held and VF configuration with rtnl_lock(), they can
> run in parallel.

Yes, I think you're right. I am adding locking.