Re: [PATCH] r8169: Load MAC address from device tree if present

Thierry Reding
2019-01-25T15:33:17Z

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On Fri, Jan 25, 2019 at 03:57:11PM +0100, Andrew Lunn wrote:
> On Fri, Jan 25, 2019 at 11:18:14AM +0100, Thierry Reding wrote:
> > From: Thierry Reding <treding@nvidia.com>
> >
> > If the system was booted using a device tree and if the device tree
> > contains a MAC address, use it instead of reading one from the EEPROM.
> > This is useful in situations where the EEPROM isn't properly programmed
> > or where the firmware wants to override the existing MAC address.
> >
> > Signed-off-by: Thierry Reding <treding@nvidia.com>
> > ---
> > Based on net-next.
> >
> > drivers/net/ethernet/realtek/r8169.c | 35 +++++++++++++++++-----------
> > 1 file changed, 22 insertions(+), 13 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
> > index f574b6b557f9..fd9edd643ca5 100644
> > --- a/drivers/net/ethernet/realtek/r8169.c
> > +++ b/drivers/net/ethernet/realtek/r8169.c
> > @@ -6957,6 +6957,21 @@ static int rtl_alloc_irq(struct rtl8169_private *tp)
> > return pci_alloc_irq_vectors(tp->pci_dev, 1, 1, flags);
> > }
> >
> > +static void rtl_read_mac_address(struct rtl8169_private *tp,
> > + u8 mac_addr[ETH_ALEN])
> > +{
> > + /* Get MAC address */
> > + switch (tp->mac_version) {
> > + case RTL_GIGA_MAC_VER_35 ... RTL_GIGA_MAC_VER_38:
> > + case RTL_GIGA_MAC_VER_40 ... RTL_GIGA_MAC_VER_51:
> > + *(u32 *)&mac_addr[0] = rtl_eri_read(tp, 0xe0, ERIAR_EXGMAC);
> > + *(u16 *)&mac_addr[4] = rtl_eri_read(tp, 0xe4, ERIAR_EXGMAC);
> > + break;
> > + default:
> > + break;
> > + }
> > +}
> > +
> > DECLARE_RTL_COND(rtl_link_list_ready_cond)
> > {
> > return RTL_R8(tp, MCU) & LINK_LIST_RDY;
> > @@ -7148,6 +7163,7 @@ static int rtl_get_ether_clk(struct rtl8169_private *tp)
> > static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
> > {
> > const struct rtl_cfg_info *cfg = rtl_cfg_infos + ent->driver_data;
> > + u8 mac_addr[ETH_ALEN] __aligned(4);
>
> Hi Thierry
>
> Maybe now would be a good time to cleanup this __aligned(4), pointer
> aliasing, etc?

Are you proposing that I rewrite rtl_read_mac_address() to manually
extract bytes from each register read? Something along these lines:

value = rtl_eri_read(tp, 0xe0, ERIAR_EXGMAC);
mac_addr[0] = (value >> 0) & 0xff;
mac_addr[1] = (value >> 8) & 0xff;
mac_addr[2] = (value >> 16) & 0xff;
mac_addr[3] = (value >> 24) & 0xff;

value = rtl_eri_read(tp, 0xe4 ERIAR_EXGMAC);
mac_addr[4] = (value >> 0) & 0xff;
mac_addr[5] = (value >> 8) & 0xff;

Looks like maybe that should be a separate patch?

>
> > + /* get MAC address */
> > + if (eth_platform_get_mac_address(&pdev->dev, mac_addr))
> > + rtl_read_mac_address(tp, mac_addr);
> > +
>
> Maybe that could be made more readable with:
>
> err = eth_platform_get_mac_address(&pdev->dev, mac_addr);
> if (err)
> rtl_read_mac_address(tp, mac_addr);

I was following the same pattern that other drivers were, but I can
change to the above if you prefer.

Thanks,
Thierry

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