linux-kernel - [PATCH AUTOSEL for 4.9 027/219] i40e: fix ethtool to get EEPROM data from X722 interface

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Message-ID: <20180303222716.26640-27-alexander.levin@microsoft.com>
Date:   Sat, 3 Mar 2018 22:28:11 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Lihong Yang <lihong.yang@...el.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.9 027/219] i40e: fix ethtool to get EEPROM data
 from X722 interface

From: Lihong Yang <lihong.yang@...el.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.yang@...el.com>
Tested-by: Andrew Bowers <andrewx.bowers@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.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 92bc8846f1ba..f4569461dcb8 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
@@ -1135,6 +1135,11 @@ 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