netdev - RE: [PATCH net-next v2 1/1] i40e: add support for PTP external synchronization clock

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Message-ID: <DM6PR11MB4610EF80DFA1C2EB2166CE49F3E49@DM6PR11MB4610.namprd11.prod.outlook.com>
Date:   Thu, 22 Jul 2021 12:54:28 +0000
From:   "Kwapulinski, Piotr" <piotr.kwapulinski@...el.com>
To:     Richard Cochran <richardcochran@...il.com>,
        "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "Loktionov, Aleksandr" <aleksandr.loktionov@...el.com>,
        "Kubalewski, Arkadiusz" <arkadiusz.kubalewski@...el.com>,
        "K, AshishX" <ashishx.k@...el.com>
Subject: RE: [PATCH net-next v2 1/1] i40e: add support for PTP external
 synchronization clock

> From: Richard Cochran <richardcochran@...il.com>
> Sent: Thursday, July 22, 2021 1:47 PM
>
> > On Tue, Jul 20, 2021 at 04:23:48PM -0700, Tony Nguyen wrote:
>
> > +/**
> > + * i40e_set_subsystem_device_id - set subsystem device id
> > + * @hw: pointer to the hardware info
> > + *
> > + * Set PCI subsystem device id either from a pci_dev structure or
> > + * a specific FW register.
> > + **/
> > +static inline void i40e_set_subsystem_device_id(struct i40e_hw *hw) {
> > +   struct pci_dev *pdev = ((struct i40e_pf *)hw->back)->pdev;
> > +
> > +   hw->subsystem_device_id = pdev->subsystem_device ?
> > +           pdev->subsystem_device :
> > +           (ushort)(rd32(hw, I40E_PFPCI_SUBSYSID) & USHRT_MAX); }
> > +
> >  /**
> >   * i40e_probe - Device initialization routine
> >   * @pdev: PCI device information struct @@ -15262,7 +15281,7 @@
> > static int i40e_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
> >     hw->device_id = pdev->device;
> >     pci_read_config_byte(pdev, PCI_REVISION_ID, &hw->revision_id);
> >     hw->subsystem_vendor_id = pdev->subsystem_vendor;
> > -   hw->subsystem_device_id = pdev->subsystem_device;
> > +   i40e_set_subsystem_device_id(hw);
>
> What does this have to do with $SUBJECT?  Nothing, AFAICT.

It is required to properly handle the pin settings on PF other than 0.

Regards,
Piotr