> -----Original Message-----
> From: Sowmini Varadhan [mailto:sowmini.varad...@oracle.com]
> Sent: Friday, October 30, 2015 8:04 AM
> To:
> Subject: [PATCH v3 net] i40e: Look up MAC address in Open Firmware or IDPROM
>
>
> This is the i40e equivalent of commit c762dff24c06 ("ixgbe: Look up MAC
> address in Open Firmware or IDPROM").
>
> As with that fix, attempt to look up the MAC address in Open Firmware
> on systems that support it, and use IDPROM on SPARC if no OF address
> is found.
Going along with this being the equivalent of the ixgbe patch, I'd prefer the
new code to be in i40e_main.c, rather than in i40e_common.c. In the design of
our drivers, the common file is essentially a device specific layer, and the OS
and platform related stuff should stay in i40e_main.c. That would also take
care of one of the include file nits that Andy mentioned.
At the risk of flying my Device Tree ignorance for all to see, I have a couple
questions on how this is used.
Since the mac address is specific to the individual device, how does it get
into the device tree? I thought the device tree was compiled ahead of time for
the platform it is used on. Is this a generic DT pattern just in case some
platform actually has the mac-address? Or does the device mac-address get
saved into the DT on the first time through this path so it can be found next
time?
If the Device Tree has a different mac address than the HW, when does the
kernel tell the HW to use a different mac address? Does the DT management
eventually call the ndo_set_mac_address call so the HW knows to use a different
mac address?
Thanks,
sln
>
> Reviewed-by: Martin K. Petersen <martin.peter...@oracle.com>
> Signed-off-by: Sowmini Varadhan <sowmini.varad...@oracle.com>
> ---
> v2: andy shevchenko comments
> v3: more andy shevchenko comments
> drivers/net/ethernet/intel/i40e/i40e_common.c | 30
> +++++++++++++++++++++++++
> 1 files changed, 30 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/i40e/i40e_common.c
> b/drivers/net/ethernet/intel/i40e/i40e_common.c
> index 2d74c6e..3edfe19 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_common.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_common.c
> @@ -24,6 +24,14 @@
> *
>
> ******************************************************************************/
>
> +#include <linux/etherdevice.h>
> +#include <linux/of_net.h>
> +#include <linux/pci.h>
> +#ifdef CONFIG_SPARC
> +#include <asm/idprom.h>
> +#include <asm/prom.h>
> +#endif
> +#include "i40e.h"
> #include "i40e_type.h"
> #include "i40e_adminq.h"
> #include "i40e_prototype.h"
> @@ -1008,6 +1016,25 @@ i40e_status i40e_aq_mac_address_write(struct i40e_hw
> *hw,
> return status;
> }
>
> +static int i40e_get_platform_mac_addr(struct i40e_hw *hw, u8 *mac_addr)
> +{
> + struct i40e_pf *pf = hw->back;
> + struct device_node *dp = pci_device_to_OF_node(pf->pdev);
> + const unsigned char *addr;
> +
> + addr = of_get_mac_address(dp);
> + if (addr) {
> + ether_addr_copy(mac_addr, addr);
> + return 0;
> + }
> +
> +#ifdef CONFIG_SPARC
> + ether_addr_copy(mac_addr, idprom->id_ethaddr);
> + return 0;
> +#endif /* CONFIG_SPARC */
> + return 1;
> +}
> +
> /**
> * i40e_get_mac_addr - get MAC address
> * @hw: pointer to the HW structure
> @@ -1021,6 +1048,9 @@ i40e_status i40e_get_mac_addr(struct i40e_hw *hw, u8
> *mac_addr)
> i40e_status status;
> u16 flags = 0;
>
> + if (!i40e_get_platform_mac_addr(hw, mac_addr))
> + return I40E_SUCCESS;
> +
> status = i40e_aq_mac_address_read(hw, &flags, &addrs, NULL);
>
> if (flags & I40E_AQC_LAN_ADDR_VALID)
> --
> 1.7.1
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