[ 007/105] e1000: fix vlan processing regression

[Ben Hutchings]

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jiri Pirko <jpirko@xxxxxxxxxx>

commit 52f5509fe8ccb607ff9b84ad618f244262336475 upstream.

This patch fixes a regression introduced by commit "e1000: do vlan
cleanup (799d531)".

Apparently some e1000 chips (not mine) are sensitive about the order of
setting vlan filter and vlan stripping/inserting functionality. So this
patch changes the order so it's the same as before vlan cleanup.

Reported-by: Ben Greear <greearb@xxxxxxxxxxxxxxx>
Signed-off-by: Jiri Pirko <jpirko@xxxxxxxxxx>
Tested-by: Ben Greear <greearb@xxxxxxxxxxxxxxx>
Tested-by: Aaron Brown <aaron.f.brown@xxxxxxxxx>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@xxxxxxxxx>
[Jonathan Nieder: It doesn't apply cleanly to kernels before
v3.3-rc1~182^2~581 (net: introduce and use netdev_features_t for
device features sets) but a backport is straightforward.]
Signed-off-by: Jonathan Nieder <jrnieder@xxxxxxxxx>
Tested-by: Andrey Jr. Melnikov <temnota@xxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 drivers/net/ethernet/intel/e1000/e1000_main.c | 76 +++++++++++++++------------
 1 file changed, 42 insertions(+), 34 deletions(-)

--- a/drivers/net/ethernet/intel/e1000/e1000_main.c
+++ b/drivers/net/ethernet/intel/e1000/e1000_main.c
@@ -168,6 +168,8 @@ static int e1000_82547_fifo_workaround(s
 
 static bool e1000_vlan_used(struct e1000_adapter *adapter);
 static void e1000_vlan_mode(struct net_device *netdev, u32 features);
+static void e1000_vlan_filter_on_off(struct e1000_adapter *adapter,
+				     bool filter_on);
 static void e1000_vlan_rx_add_vid(struct net_device *netdev, u16 vid);
 static void e1000_vlan_rx_kill_vid(struct net_device *netdev, u16 vid);
 static void e1000_restore_vlan(struct e1000_adapter *adapter);
@@ -1219,7 +1221,7 @@ static int __devinit e1000_probe(struct
 	if (err)
 		goto err_register;
 
-	e1000_vlan_mode(netdev, netdev->features);
+	e1000_vlan_filter_on_off(adapter, false);
 
 	/* print bus type/speed/width info */
 	e_info(probe, "(PCI%s:%dMHz:%d-bit) %pM\n",
@@ -4553,6 +4555,21 @@ static bool e1000_vlan_used(struct e1000
 	return false;
 }
 
+static void __e1000_vlan_mode(struct e1000_adapter *adapter, u32 features)
+{
+	struct e1000_hw *hw = &adapter->hw;
+	u32 ctrl;
+
+	ctrl = er32(CTRL);
+	if (features & NETIF_F_HW_VLAN_RX) {
+		/* enable VLAN tag insert/strip */
+		ctrl |= E1000_CTRL_VME;
+	} else {
+		/* disable VLAN tag insert/strip */
+		ctrl &= ~E1000_CTRL_VME;
+	}
+	ew32(CTRL, ctrl);
+}
 static void e1000_vlan_filter_on_off(struct e1000_adapter *adapter,
 				     bool filter_on)
 {
@@ -4562,6 +4579,7 @@ static void e1000_vlan_filter_on_off(str
 	if (!test_bit(__E1000_DOWN, &adapter->flags))
 		e1000_irq_disable(adapter);
 
+	__e1000_vlan_mode(adapter, adapter->netdev->features);
 	if (filter_on) {
 		/* enable VLAN receive filtering */
 		rctl = er32(RCTL);
@@ -4584,21 +4602,11 @@ static void e1000_vlan_filter_on_off(str
 static void e1000_vlan_mode(struct net_device *netdev, u32 features)
 {
 	struct e1000_adapter *adapter = netdev_priv(netdev);
-	struct e1000_hw *hw = &adapter->hw;
-	u32 ctrl;
 
 	if (!test_bit(__E1000_DOWN, &adapter->flags))
 		e1000_irq_disable(adapter);
 
-	ctrl = er32(CTRL);
-	if (features & NETIF_F_HW_VLAN_RX) {
-		/* enable VLAN tag insert/strip */
-		ctrl |= E1000_CTRL_VME;
-	} else {
-		/* disable VLAN tag insert/strip */
-		ctrl &= ~E1000_CTRL_VME;
-	}
-	ew32(CTRL, ctrl);
+	__e1000_vlan_mode(adapter, features);
 
 	if (!test_bit(__E1000_DOWN, &adapter->flags))
 		e1000_irq_enable(adapter);


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