netdev - Re: [PATCH net] ixgbe: fix probing of multi-port devices with one MDIO

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Date:   Sat, 17 Oct 2020 01:50:59 +0200
From:   Ian Kumlien <ian.kumlien@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     David Miller <davem@...emloft.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        kernel-team@...com, anthony.l.nguyen@...el.com,
        jesse.brandeburg@...el.com
Subject: Re: [PATCH net] ixgbe: fix probing of multi-port devices with one MDIO

On Sat, Oct 17, 2020 at 1:20 AM Jakub Kicinski <kuba@...nel.org> wrote:
>
> Ian reports that after upgrade from v5.8.14 to v5.9 only one
> of his 4 ixgbe netdevs appear in the system.
>
> Quoting the comment on ixgbe_x550em_a_has_mii():
>  * Returns true if hw points to lowest numbered PCI B:D.F x550_em_a device in
>  * the SoC.  There are up to 4 MACs sharing a single MDIO bus on the x550em_a,
>  * but we only want to register one MDIO bus.
>
> This matches the symptoms, since the return value from
> ixgbe_mii_bus_init() is no longer ignored we need to handle
> the higher ports of x550em without an error.

Nice, that fixes it!

You can add a:
Tested-by: Ian Kumlien <ian.kumlien@...il.com>

;)

> Fixes: 09ef193fef7e ("net: ethernet: ixgbe: check the return value of ixgbe_mii_bus_init()")
> Reported-by: Ian Kumlien <ian.kumlien@...il.com>
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>
> ---
>  drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c | 23 ++++++++++++--------
>  1 file changed, 14 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c
> index f77fa3e4fdd1..fc389eecdd2b 100644
> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c
> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c
> @@ -901,15 +901,13 @@ static bool ixgbe_x550em_a_has_mii(struct ixgbe_hw *hw)
>   **/
>  s32 ixgbe_mii_bus_init(struct ixgbe_hw *hw)
>  {
> +       s32 (*write)(struct mii_bus *bus, int addr, int regnum, u16 val);
> +       s32 (*read)(struct mii_bus *bus, int addr, int regnum);
>         struct ixgbe_adapter *adapter = hw->back;
>         struct pci_dev *pdev = adapter->pdev;
>         struct device *dev = &adapter->netdev->dev;
>         struct mii_bus *bus;
>
> -       bus = devm_mdiobus_alloc(dev);
> -       if (!bus)
> -               return -ENOMEM;
> -
>         switch (hw->device_id) {
>         /* C3000 SoCs */
>         case IXGBE_DEV_ID_X550EM_A_KR:
> @@ -922,16 +920,23 @@ s32 ixgbe_mii_bus_init(struct ixgbe_hw *hw)
>         case IXGBE_DEV_ID_X550EM_A_1G_T:
>         case IXGBE_DEV_ID_X550EM_A_1G_T_L:
>                 if (!ixgbe_x550em_a_has_mii(hw))
> -                       return -ENODEV;
> -               bus->read = &ixgbe_x550em_a_mii_bus_read;
> -               bus->write = &ixgbe_x550em_a_mii_bus_write;
> +                       return 0;
> +               read = &ixgbe_x550em_a_mii_bus_read;
> +               write = &ixgbe_x550em_a_mii_bus_write;
>                 break;
>         default:
> -               bus->read = &ixgbe_mii_bus_read;
> -               bus->write = &ixgbe_mii_bus_write;
> +               read = &ixgbe_mii_bus_read;
> +               write = &ixgbe_mii_bus_write;
>                 break;
>         }
>
> +       bus = devm_mdiobus_alloc(dev);
> +       if (!bus)
> +               return -ENOMEM;
> +
> +       bus->read = read;
> +       bus->write = write;
> +
>         /* Use the position of the device in the PCI hierarchy as the id */
>         snprintf(bus->id, MII_BUS_ID_SIZE, "%s-mdio-%s", ixgbe_driver_name,
>                  pci_name(pdev));
> --
> 2.26.2
>