[PATCH AUTOSEL for 4.4 013/115] i40e: fix ethtool to get EEPROM data from X722 interface

[Sasha Levin]

From: Lihong Yang <lihong.y...@intel.com>

[ Upstream commit c271dd6c391b535226cf1a81aaad9f33cb5899d3 ]

Currently ethtool -e will error out with a X722 interface
as its EEPROM has a scope limit at offset 0x5B9FFF.
This patch fixes the issue by setting the EEPROM length to
the scope limit to avoid NVM read failure beyond that.

Change-ID: I0b7d4dd6c7f2a57cace438af5dffa0f44c229372
Signed-off-by: Lihong Yang <lihong.y...@intel.com>
Tested-by: Andrew Bowers <andrewx.bow...@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirs...@intel.com>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
---
 drivers/net/ethernet/intel/i40e/i40e_ethtool.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c 
b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
index 488a50d59dca..3da1f206ff84 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
@@ -1073,6 +1073,11 @@ static int i40e_get_eeprom_len(struct net_device *netdev)
        struct i40e_hw *hw = &np->vsi->back->hw;
        u32 val;
 
+#define X722_EEPROM_SCOPE_LIMIT 0x5B9FFF
+       if (hw->mac.type == I40E_MAC_X722) {
+               val = X722_EEPROM_SCOPE_LIMIT + 1;
+               return val;
+       }
        val = (rd32(hw, I40E_GLPCI_LBARCTRL)
                & I40E_GLPCI_LBARCTRL_FL_SIZE_MASK)
                >> I40E_GLPCI_LBARCTRL_FL_SIZE_SHIFT;
-- 
2.14.1