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ixgbe: fix probing of multi-port devices with one MDIO

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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.

Fixes: 09ef193fef7e ("net: ethernet: ixgbe: check the return value of ixgbe_mii_bus_init()")
Reported-by: Ian Kumlien <ian.kumlien@gmail.com>
Tested-by: Ian Kumlien <ian.kumlien@gmail.com>
Acked-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Link: https://lore.kernel.org/r/20201016232006.3352947-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2020-10-16 16:20:06 -07:00
parent 60f1626f0f
commit bd7f14df94
1 changed files with 14 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c
View File

@ -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));