[Intel-wired-lan] [net-next PATCH] ixgbe: add new bus type for intergrated I/O interface (IOSF)

[Alexander Duyck]

On 06/18/2015 10:24 AM, Donald C Skidmore wrote:
> With this patch we add support for a new bus type ixgbe_bus_type_internal.
> X550em devices use IOSF and not PCIe bus so this new type is to accommodate
> them.
>
> Signed-off-by: Donald C Skidmore <donald.c.skidmore at intel.com>
> ---
>   drivers/net/ethernet/intel/ixgbe/ixgbe_main.c |   11 ++++++++++-
>   drivers/net/ethernet/intel/ixgbe/ixgbe_type.h |    1 +
>   drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c |    1 +
>   3 files changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> index 5f1b06a..dd53abd 100644
> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> @@ -246,11 +246,19 @@ static inline bool ixgbe_pcie_from_parent(struct ixgbe_hw *hw)
>   static void ixgbe_check_minimum_link(struct ixgbe_adapter *adapter,
>   				     int expected_gts)
>   {
> +	struct ixgbe_hw *hw = &adapter->hw;
>   	int max_gts = 0;
>   	enum pci_bus_speed speed = PCI_SPEED_UNKNOWN;
>   	enum pcie_link_width width = PCIE_LNK_WIDTH_UNKNOWN;
>   	struct pci_dev *pdev;
>   
> +	/* Some devices are not connected over PCIe and thus do not negotiate
> +	 * speed. These devices do not have valid bus info, and thus any report
> +	 * we generate may not be correct.
> +	 */
> +	if (hw->bus.type == ixgbe_bus_type_internal)
> +		return;
> +
>   	/* determine whether to use the parent device */
>   	if (ixgbe_pcie_from_parent(&adapter->hw))
>   		pdev = adapter->pdev->bus->parent->self;
> @@ -8844,9 +8852,10 @@ skip_sriov:
>   	hw->eeprom.ops.read(hw, 0x2d, &adapter->eeprom_verl);
>   
>   	/* pick up the PCI bus settings for reporting later */
> -	hw->mac.ops.get_bus_info(hw);
>   	if (ixgbe_pcie_from_parent(hw))
>   		ixgbe_get_parent_bus_info(adapter);
> +	else
> +		 hw->mac.ops.get_bus_info(hw);
>   
>   	/* calculate the expected PCIe bandwidth required for optimal
>   	 * performance. Note that some older parts will never have enough
> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
> index 19271e5..37df15f 100644
> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
> @@ -3067,6 +3067,7 @@ enum ixgbe_bus_type {
>   	ixgbe_bus_type_pci,
>   	ixgbe_bus_type_pcix,
>   	ixgbe_bus_type_pci_express,
> +	ixgbe_bus_type_internal,
>   	ixgbe_bus_type_reserved
>   };
>   

Are there really any parts that are listed as using a pci or pcix type?  
If not you could probably drop those types from the enum since they 
don't add any value.