linux-kernel - [PATCH v4 RFC net] i40e: Look up MAC address in Open Firmware or IDPROM

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Message-ID: <20151101162439.GB26373@oracle.com>
Date:	Sun, 1 Nov 2015 11:24:39 -0500
From:	Sowmini Varadhan <sowmini.varadhan@...cle.com>
To:	sowmini.varadhan@...cle.com, intel-wired-lan@...ts.osuosl.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	jeffrey.t.kirsher@...el.com, jesse.brandeburg@...el.com,
	shannon.nelson@...el.com, carolyn.wyborny@...el.com,
	donald.c.skidmore@...el.com, matthew.vick@...el.com,
	john.ronciak@...el.com, mitch.a.williams@...el.com,
	andy.shevchenko@...il.com
Subject: [PATCH v4 RFC 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.

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.

Reviewers: please check if invoking i40e_macaddr_init() on 
platforms that use the default mac address (i.e., when it is not from
OF or idprom) will cause harm, and if it is necessary/possible to
move this invocation to an earlier point in i40e_probe().

Reviewed-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sowmini Varadhan <sowmini.varadhan@...cle.com>
---
v2, v3: Andy Shevchenko comments
v4: 

 drivers/net/ethernet/intel/i40e/i40e_main.c |   53 ++++++++++++++++++++++++++-
 1 files changed, 52 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..3c81c0c 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"
@@ -9212,6 +9221,25 @@ static struct i40e_vsi *i40e_vsi_reinit_setup(struct i40e_vsi *vsi)
 	return NULL;
 }
 
+static int i40e_macaddr_init( struct i40e_vsi *vsi, u8 *macaddr)
+{
+	int ret; 
+	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)
+		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);
+	i40e_aq_add_macvlan(&vsi->back->hw, vsi->seid, &element, 1, NULL);
+
+	return ret;
+}
+
 /**
  * i40e_vsi_setup - Set up a VSI by a given type
  * @pf: board private structure
@@ -9341,6 +9369,9 @@ 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;
@@ -10162,6 +10193,24 @@ static void i40e_print_features(struct i40e_pf *pf)
 	kfree(string);
 }
 
+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
@@ -10360,7 +10409,9 @@ 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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