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[PATCH v6] i40e: Look up MAC address in Open Firmware or IDPROM

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  [PATCH v6] i40e: Look up MAC address in Open Firmware or IDPROM Sowmini Varadhan <sowmini.varadhan@oracle.com> - 2015-11-05 00:30 +0100
    RE: [PATCH v6] i40e: Look up MAC address in Open Firmware or IDPROM "Nelson, Shannon" <shannon.nelson@intel.com> - 2015-11-05 01:10 +0100
    Re: [PATCH v6] i40e: Look up MAC address in Open Firmware or IDPROM David Miller <davem@davemloft.net> - 2015-11-05 16:40 +0100
      Re: [PATCH v6] i40e: Look up MAC address in Open Firmware or IDPROM David Miller <davem@davemloft.net> - 2015-11-05 17:10 +0100
        Re: [PATCH v6] i40e: Look up MAC address in Open Firmware or IDPROM David Miller <davem@davemloft.net> - 2015-11-05 17:30 +0100
          Re: [PATCH v6] i40e: Look up MAC address in Open Firmware or IDPROM Sowmini Varadhan <sowmini.varadhan@oracle.com> - 2015-11-05 18:20 +0100
          RE: [PATCH v6] i40e: Look up MAC address in Open Firmware or IDPROM "Nelson, Shannon" <shannon.nelson@intel.com> - 2015-11-05 18:50 +0100
        Re: [PATCH v6] i40e: Look up MAC address in Open Firmware or IDPROM Sowmini Varadhan <sowmini.varadhan@oracle.com> - 2015-11-05 17:30 +0100
        Re: [PATCH v6] i40e: Look up MAC address in Open Firmware or IDPROM Andy Shevchenko <andy.shevchenko@gmail.com> - 2015-11-05 19:20 +0100
          Re: [PATCH v6] i40e: Look up MAC address in Open Firmware or IDPROM David Miller <davem@davemloft.net> - 2015-11-05 19:40 +0100
            Re: [PATCH v6] i40e: Look up MAC address in Open Firmware or IDPROM Andy Shevchenko <andy.shevchenko@gmail.com> - 2015-11-05 20:40 +0100

#1262736 — [PATCH v6] 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.

In the case of the i40e there is an assumption that the default mac
address has already been set up as the primary mac filter on probe,
so if this filter is obtained from the Open Firmware or IDPROM, an
explicit write is needed via i40e_aq_mac_address_write() and
i40e_aq_add_macvlan() invocation.

Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
---
v2, v3: Andy Shevchenko comments
v4: Shannon Nelson review: explicitly set up mac filters before register_netdev
v5: Shannon Nelson code style comments
v6: Shannon Nelson code style comments

 drivers/net/ethernet/intel/i40e/i40e_main.c |   83 ++++++++++++++++++++++++++-
 1 files changed, 82 insertions(+), 1 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index b825f97..e355873 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -24,6 +24,15 @@
  *
  ******************************************************************************/
 
+#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
+
 /* Local includes */
 #include "i40e.h"
 #include "i40e_diag.h"
@@ -9213,6 +9222,44 @@ static struct i40e_vsi *i40e_vsi_reinit_setup(struct i40e_vsi *vsi)
 }
 
 /**
+ * i40e_macaddr_init - explicitly write the mac address filters.
+ *
+ * @vsi: pointer to the vsi.
+ * @macaddr: the MAC address
+ *
+ * This is needed when the macaddr has been obtained by other
+ * means than the default, e.g., from Open Firmware or IDPROM.
+ * Returns 0 on success, negative on failure
+ **/
+static int i40e_macaddr_init(struct i40e_vsi *vsi, u8 *macaddr)
+{
+	int ret, aq_err;
+	struct i40e_aqc_add_macvlan_element_data element;
+
+	ret = i40e_aq_mac_address_write(&vsi->back->hw,
+					I40E_AQC_WRITE_TYPE_LAA_WOL,
+					macaddr, NULL);
+	if (ret) {
+		dev_info(&vsi->back->pdev->dev,
+			 "Addr change for VSI failed: %d\n", ret);
+		return -EADDRNOTAVAIL;
+	}
+
+	memset(&element, 0, sizeof(element));
+	ether_addr_copy(element.mac_addr, macaddr);
+	element.flags = cpu_to_le16(I40E_AQC_MACVLAN_ADD_PERFECT_MATCH);
+	ret = i40e_aq_add_macvlan(&vsi->back->hw, vsi->seid, &element, 1, NULL);
+	aq_err = vsi->back->hw.aq.asq_last_status;
+	if (aq_err != I40E_AQ_RC_OK) {
+		dev_info(&vsi->back->pdev->dev,
+			 "add filter failed err %s aq_err %s\n",
+			 i40e_stat_str(&vsi->back->hw, ret),
+			 i40e_aq_str(&vsi->back->hw, aq_err));
+	}
+	return ret;
+}
+
+/**
  * i40e_vsi_setup - Set up a VSI by a given type
  * @pf: board private structure
  * @type: VSI type
@@ -9341,6 +9388,9 @@ struct i40e_vsi *i40e_vsi_setup(struct i40e_pf *pf, u8 type,
 		ret = i40e_config_netdev(vsi);
 		if (ret)
 			goto err_netdev;
+		ret = i40e_macaddr_init(vsi, pf->hw.mac.addr);
+		if (ret)
+			goto err_netdev;
 		ret = register_netdev(vsi->netdev);
 		if (ret)
 			goto err_netdev;
@@ -10163,6 +10213,35 @@ static void i40e_print_features(struct i40e_pf *pf)
 }
 
 /**
+ * i40e_get_platform_mac_addr - get platform-specific MAC address
+ *
+ * @pdev: PCI device information struct
+ * @mac_addr: the MAC address to be returned
+ *
+ * Look up the MAC address in Open Firmware  on systems that support it,
+ * and use IDPROM on SPARC if no OF address is found.
+ *
+ * Returns 0 on success, negative on failure
+ **/
+static int i40e_get_platform_mac_addr(struct pci_dev *pdev, u8 *mac_addr)
+{
+	struct device_node *dp = pci_device_to_OF_node(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;
+#else
+	return -EINVAL;
+#endif /* CONFIG_SPARC */
+}
+
+/**
  * i40e_probe - Device initialization routine
  * @pdev: PCI device information struct
  * @ent: entry in i40e_pci_tbl
@@ -10360,7 +10439,9 @@ static int i40e_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 		i40e_aq_stop_lldp(hw, true, NULL);
 	}
 
-	i40e_get_mac_addr(hw, hw->mac.addr);
+	err = i40e_get_platform_mac_addr(pdev, hw->mac.addr);
+	if (err)
+		i40e_get_mac_addr(hw, hw->mac.addr);
 	if (!is_valid_ether_addr(hw->mac.addr)) {
 		dev_info(&pdev->dev, "invalid MAC address %pM\n", hw->mac.addr);
 		err = -EIO;
-- 
1.7.1

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#1262757

> From: Sowmini Varadhan [mailto:sowmini.varadhan@oracle.com]
> Sent: Wednesday, November 04, 2015 3:21 PM
> 
> 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.
> 
> In the case of the i40e there is an assumption that the default mac
> address has already been set up as the primary mac filter on probe,
> so if this filter is obtained from the Open Firmware or IDPROM, an
> explicit write is needed via i40e_aq_mac_address_write() and
> i40e_aq_add_macvlan() invocation.
> 
> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
> Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
> ---
> v2, v3: Andy Shevchenko comments
> v4: Shannon Nelson review: explicitly set up mac filters before
> register_netdev
> v5: Shannon Nelson code style comments
> v6: Shannon Nelson code style comments
> 
>  drivers/net/ethernet/intel/i40e/i40e_main.c |   83
> ++++++++++++++++++++++++++-
>  1 files changed, 82 insertions(+), 1 deletions(-)
> 

Acked-by: Shannon Nelson <shannon.nelson@intel.com>


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#1263339

From: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Date: Wed, 4 Nov 2015 18:21:00 -0500

> 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.
> 
> In the case of the i40e there is an assumption that the default mac
> address has already been set up as the primary mac filter on probe,
> so if this filter is obtained from the Open Firmware or IDPROM, an
> explicit write is needed via i40e_aq_mac_address_write() and
> i40e_aq_add_macvlan() invocation.
> 
> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
> Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>

Thanks for doing this.

Longer term we really need an abstract interface by which
architectures can provide a "system" or "firmware" MAC address
which applies to a given 'dev'.

Because these SPARC ifdef'y things really should propagate to
driver after driver after driver.

I'll see if I can cook something up.
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#1263353

From: David Miller <davem@davemloft.net>
Date: Thu, 05 Nov 2015 10:31:26 -0500 (EST)

> I'll see if I can cook something up.

How does this look?

====================
net: Add eth_platform_get_mac_address() helper.

A repeating pattern in drivers has become to use OF node information
and, if not found, platform specific host information to extract the
ethernet address for a given device.

Currently this is done with a call to of_get_mac_mac_address() and
then some ifdef'd stuff for SPARC.

Consolidate this into a portable routine, and provide the
arch_get_platform_mac_address() weak function hook for all
architectures to implement if they want.

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/arch/sparc/kernel/idprom.c b/arch/sparc/kernel/idprom.c
index 6bd7501..f95dd11 100644
--- a/arch/sparc/kernel/idprom.c
+++ b/arch/sparc/kernel/idprom.c
@@ -9,6 +9,7 @@
 #include <linux/types.h>
 #include <linux/init.h>
 #include <linux/export.h>
+#include <linux/etherdevice.h>
 
 #include <asm/oplib.h>
 #include <asm/idprom.h>
@@ -60,6 +61,12 @@ static void __init display_system_type(unsigned char machtype)
 {
 }
 #endif
+
+unsigned char *arch_get_platform_mac_address(void)
+{
+	return idprom->id_ethaddr;
+}
+
 /* Calculate the IDPROM checksum (xor of the data bytes). */
 static unsigned char __init calc_idprom_cksum(struct idprom *idprom)
 {
diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h
index eb049c6..37ff4a6 100644
--- a/include/linux/etherdevice.h
+++ b/include/linux/etherdevice.h
@@ -29,6 +29,9 @@
 #include <asm/bitsperlong.h>
 
 #ifdef __KERNEL__
+struct device;
+int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr);
+unsigned char *arch_get_platform_get_mac_address(void);
 u32 eth_get_headlen(void *data, unsigned int max_len);
 __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev);
 extern const struct header_ops eth_header_ops;
diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
index 9e63f25..1cb9204f 100644
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c
@@ -52,6 +52,8 @@
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/if_ether.h>
+#include <linux/of_net.h>
+#include <linux/pci.h>
 #include <net/dst.h>
 #include <net/arp.h>
 #include <net/sock.h>
@@ -485,3 +487,33 @@ static int __init eth_offload_init(void)
 }
 
 fs_initcall(eth_offload_init);
+
+unsigned char * __weak arch_get_platform_mac_address(void)
+{
+	return NULL;
+}
+
+int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr)
+{
+	const unsigned char *addr;
+	struct device_node *dp;
+
+	if (dev_is_pci(dev))
+		dp = pci_device_to_OF_node(to_pci_dev(dev));
+	else
+		dp = dev->of_node;
+
+	addr = NULL;
+	if (dp)
+		addr = of_get_mac_address(dp);
+	if (!addr)
+		addr = arch_get_platform_mac_address();
+
+	if (addr) {
+		ether_addr_copy(mac_addr, addr);
+		return 0;
+	}
+
+	return -ENODEV;
+}
+EXPORT_SYMBOL(eth_platform_get_mac_address);
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#1263398

From: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Date: Thu, 5 Nov 2015 11:28:31 -0500

> On (11/05/15 11:05), David Miller wrote:
>> From: David Miller <davem@davemloft.net>
>> Date: Thu, 05 Nov 2015 10:31:26 -0500 (EST)
>> 
>> > I'll see if I can cook something up.
>> 
>> How does this look?
> 
> Looks good to me,
> 
> Do you want me to respin patch v7 with this? Or update ixgbe/i40e to use
> this later, after this goes in?

The intention is to let your patch go in as-is, then try and update
ixgbe/i40e later in net-next or similar.
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#1263438

On (11/05/15 11:29), David Miller wrote:
> 
> The intention is to let your patch go in as-is, then try and update
> ixgbe/i40e later in net-next or similar.

Sounds good, I can take care of ixgbe/i40e after that happens.


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#1263452

> From: David Miller [mailto:davem@davemloft.net]
> Sent: Thursday, November 05, 2015 8:29 AM
> 
> From: Sowmini Varadhan <sowmini.varadhan@oracle.com>
> Date: Thu, 5 Nov 2015 11:28:31 -0500
> 
> > On (11/05/15 11:05), David Miller wrote:
> >> From: David Miller <davem@davemloft.net>
> >> Date: Thu, 05 Nov 2015 10:31:26 -0500 (EST)
> >>
> >> > I'll see if I can cook something up.
> >>
> >> How does this look?
> >
> > Looks good to me,
> >
> > Do you want me to respin patch v7 with this? Or update ixgbe/i40e to
> use
> > this later, after this goes in?
> 
> The intention is to let your patch go in as-is, then try and update
> ixgbe/i40e later in net-next or similar.

That works for us as well - thanks!
sln


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#1263400

On (11/05/15 11:05), David Miller wrote:
> From: David Miller <davem@davemloft.net>
> Date: Thu, 05 Nov 2015 10:31:26 -0500 (EST)
> 
> > I'll see if I can cook something up.
> 
> How does this look?

Looks good to me,

Do you want me to respin patch v7 with this? Or update ixgbe/i40e to use
this later, after this goes in?

--Sowmini


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#1263466

On Thu, Nov 5, 2015 at 6:05 PM, David Miller <davem@davemloft.net> wrote:
> From: David Miller <davem@davemloft.net>
> Date: Thu, 05 Nov 2015 10:31:26 -0500 (EST)
>
>> I'll see if I can cook something up.
>
> How does this look?

I like it, though couple of style related comments.

>
> ====================
> net: Add eth_platform_get_mac_address() helper.
>
> A repeating pattern in drivers has become to use OF node information
> and, if not found, platform specific host information to extract the
> ethernet address for a given device.
>
> Currently this is done with a call to of_get_mac_mac_address() and
> then some ifdef'd stuff for SPARC.
>
> Consolidate this into a portable routine, and provide the
> arch_get_platform_mac_address() weak function hook for all
> architectures to implement if they want.
>
> Signed-off-by: David S. Miller <davem@davemloft.net>
>
> diff --git a/arch/sparc/kernel/idprom.c b/arch/sparc/kernel/idprom.c
> index 6bd7501..f95dd11 100644
> --- a/arch/sparc/kernel/idprom.c
> +++ b/arch/sparc/kernel/idprom.c
> @@ -9,6 +9,7 @@
>  #include <linux/types.h>
>  #include <linux/init.h>
>  #include <linux/export.h>
> +#include <linux/etherdevice.h>
>
>  #include <asm/oplib.h>
>  #include <asm/idprom.h>
> @@ -60,6 +61,12 @@ static void __init display_system_type(unsigned char machtype)
>  {
>  }
>  #endif
> +
> +unsigned char *arch_get_platform_mac_address(void)
> +{
> +       return idprom->id_ethaddr;
> +}
> +
>  /* Calculate the IDPROM checksum (xor of the data bytes). */
>  static unsigned char __init calc_idprom_cksum(struct idprom *idprom)
>  {
> diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h
> index eb049c6..37ff4a6 100644
> --- a/include/linux/etherdevice.h
> +++ b/include/linux/etherdevice.h
> @@ -29,6 +29,9 @@
>  #include <asm/bitsperlong.h>
>
>  #ifdef __KERNEL__
> +struct device;
> +int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr);
> +unsigned char *arch_get_platform_get_mac_address(void);
>  u32 eth_get_headlen(void *data, unsigned int max_len);
>  __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev);
>  extern const struct header_ops eth_header_ops;
> diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
> index 9e63f25..1cb9204f 100644
> --- a/net/ethernet/eth.c
> +++ b/net/ethernet/eth.c
> @@ -52,6 +52,8 @@
>  #include <linux/errno.h>
>  #include <linux/init.h>
>  #include <linux/if_ether.h>
> +#include <linux/of_net.h>
> +#include <linux/pci.h>
>  #include <net/dst.h>
>  #include <net/arp.h>
>  #include <net/sock.h>
> @@ -485,3 +487,33 @@ static int __init eth_offload_init(void)
>  }
>
>  fs_initcall(eth_offload_init);
> +
> +unsigned char * __weak arch_get_platform_mac_address(void)
> +{
> +       return NULL;
> +}
> +
> +int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr)
> +{
> +       const unsigned char *addr;
> +       struct device_node *dp;
> +
> +       if (dev_is_pci(dev))
> +               dp = pci_device_to_OF_node(to_pci_dev(dev));
> +       else
> +               dp = dev->of_node;
> +
> +       addr = NULL;

Maybe we can use definition block for this assignment?

> +       if (dp)
> +               addr = of_get_mac_address(dp);
> +       if (!addr)
> +               addr = arch_get_platform_mac_address();
> +
> +       if (addr) {

What about

if (!addr)
 return -ENODATA;

(Yes, ENODATA looks suitable for me)

> +               ether_addr_copy(mac_addr, addr);
> +               return 0;
> +       }
> +
> +       return -ENODEV;
> +}
> +EXPORT_SYMBOL(eth_platform_get_mac_address);



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With Best Regards,
Andy Shevchenko
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#1263475

From: Andy Shevchenko <andy.shevchenko@gmail.com>
Date: Thu, 5 Nov 2015 20:13:21 +0200

> What about
> 
> if (!addr)
>  return -ENODATA;

I totally disagree.  of_get_phy_mode() and other similar attribute
probing mechanisms use -ENODEV.
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#1263505

On Thu, Nov 5, 2015 at 8:31 PM, David Miller <davem@davemloft.net> wrote:
> From: Andy Shevchenko <andy.shevchenko@gmail.com>
> Date: Thu, 5 Nov 2015 20:13:21 +0200
>
>> What about
>>
>> if (!addr)
>>  return -ENODATA;
>
> I totally disagree.  of_get_phy_mode() and other similar attribute
> probing mechanisms use -ENODEV.

Okay, then just
if (!addr)
 return -ENODEV;

-- 
With Best Regards,
Andy Shevchenko
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