[PATCH 0/2]: VLAN filtering fixes

[PATCH 0/2]: VLAN filtering fixes

[Patrick McHardy]

These two patches contain the last bits of my VLAN + tcpdump fixes.
Currently some (all?) drivers have inconsistent behaviour wrt. VLAN
filtering and promiscous mode:

They start with disabled VLAN filtering, meaning all VLAN packets
are received on packet sockets. When adding the first VLAN, VLAN
filtering is enabled and only packets for locally configured VLANs
are received, even in promiscous mode. In most cases VLAN filtering
is disabled again when removing the last VLAN, igxbe keeps it enabled
permanently however.

These patches change the Intel drivers to always enable VLAN filtering
while not in promiscous mode since there is little point in receiving
VLAN packets while nothing is interested in them, but disable filtering
while in promiscous mode so all VLANs are visible to packet sockets.

There are four more drivers that support VLAN filtering that I didn't
adapt to this behaviour since I'm not sure about what exactly they
currently do. All four of tehuti, starfire, ehea and via-velocity
have a flag for the hardware to enable promiscous mode, its unknown
to me whether this also automatically disables VLAN filtering.
Any information on this someone might have is appreciated.

[PATCH 1/2]: netdrv intel: disable VLAN filtering in promiscous mode

[Patrick McHardy]

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commit acec641127a35c44173d243ef300f7fa6cbec646
Author: Patrick McHardy <kaber@trash.net>
Date:   Wed Jul 16 11:03:55 2008 +0200

    netdrv intel: disable VLAN filtering in promiscous mode
    
    As discussed in this thread:
    
    http://www.mail-archive.com/netdev@vger.kernel.org/msg53976.html
    
    promiscous mode means to disable *all* filters. Currently only unicast
    and multicast filtering is disabled. This patch changes all Intel
    drivers to also disable VLAN filtering.
    
    Signed-off-by: Patrick McHardy <kaber@trash.net>

diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index 7aa458f..80e3a65 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -2477,10 +2477,15 @@ e1000_set_rx_mode(struct net_device *netdev)
 
 	if (netdev->flags & IFF_PROMISC) {
 		rctl |= (E1000_RCTL_UPE | E1000_RCTL_MPE);
-	} else if (netdev->flags & IFF_ALLMULTI) {
-		rctl |= E1000_RCTL_MPE;
+		rctl &= ~E1000_RCTL_VFE;
 	} else {
-		rctl &= ~E1000_RCTL_MPE;
+		if (netdev->flags & IFF_ALLMULTI) {
+			rctl |= E1000_RCTL_MPE;
+		} else {
+			rctl &= ~E1000_RCTL_MPE;
+		}
+		if (adapter->vlgrp && adapter->hw.mac_type != e1000_ich8lan)
+			rctl |= E1000_RCTL_VFE;
 	}
 
 	uc_ptr = NULL;
@@ -4962,7 +4967,8 @@ e1000_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
 		if (adapter->hw.mac_type != e1000_ich8lan) {
 			/* enable VLAN receive filtering */
 			rctl = E1000_READ_REG(&adapter->hw, RCTL);
-			rctl |= E1000_RCTL_VFE;
+			if (!(netdev->flags & IFF_PROMISC))
+				rctl |= E1000_RCTL_VFE;
 			rctl &= ~E1000_RCTL_CFIEN;
 			E1000_WRITE_REG(&adapter->hw, RCTL, rctl);
 			e1000_update_mng_vlan(adapter);
diff --git a/drivers/net/e1000e/netdev.c b/drivers/net/e1000e/netdev.c
index 80592bd..3fe6026 100644
--- a/drivers/net/e1000e/netdev.c
+++ b/drivers/net/e1000e/netdev.c
@@ -1792,7 +1792,8 @@ static void e1000_vlan_rx_register(struct net_device *netdev,
 		if (adapter->flags & FLAG_HAS_HW_VLAN_FILTER) {
 			/* enable VLAN receive filtering */
 			rctl = er32(RCTL);
-			rctl |= E1000_RCTL_VFE;
+			if (!(netdev->flags & IFF_PROMISC))
+				rctl |= E1000_RCTL_VFE;
 			rctl &= ~E1000_RCTL_CFIEN;
 			ew32(RCTL, rctl);
 			e1000_update_mng_vlan(adapter);
@@ -2230,11 +2231,16 @@ static void e1000_set_multi(struct net_device *netdev)
 
 	if (netdev->flags & IFF_PROMISC) {
 		rctl |= (E1000_RCTL_UPE | E1000_RCTL_MPE);
-	} else if (netdev->flags & IFF_ALLMULTI) {
-		rctl |= E1000_RCTL_MPE;
-		rctl &= ~E1000_RCTL_UPE;
+		rctl &= ~E1000_RCTL_VFE;
 	} else {
-		rctl &= ~(E1000_RCTL_UPE | E1000_RCTL_MPE);
+		if (netdev->flags & IFF_ALLMULTI) {
+			rctl |= E1000_RCTL_MPE;
+			rctl &= ~E1000_RCTL_UPE;
+		} else {
+			rctl &= ~(E1000_RCTL_UPE | E1000_RCTL_MPE);
+		}
+		if (adapter->vlgrp && adapter->flags & FLAG_HAS_HW_VLAN_FILTER)
+			rctl |= E1000_RCTL_VFE;
 	}
 
 	ew32(RCTL, rctl);
diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index aaed129..1ab8e3e 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -2268,14 +2268,18 @@ static void igb_set_multi(struct net_device *netdev)
 
 	rctl = rd32(E1000_RCTL);
 
-	if (netdev->flags & IFF_PROMISC)
+	if (netdev->flags & IFF_PROMISC) {
 		rctl |= (E1000_RCTL_UPE | E1000_RCTL_MPE);
-	else if (netdev->flags & IFF_ALLMULTI) {
-		rctl |= E1000_RCTL_MPE;
-		rctl &= ~E1000_RCTL_UPE;
-	} else
-		rctl &= ~(E1000_RCTL_UPE | E1000_RCTL_MPE);
-
+		rctl &= ~E1000_RCTL_VFE;
+	} else {
+		if (netdev->flags & IFF_ALLMULTI) {
+			rctl |= E1000_RCTL_MPE;
+			rctl &= ~E1000_RCTL_UPE;
+		} else
+			rctl &= ~(E1000_RCTL_UPE | E1000_RCTL_MPE);
+		if (adapter->vlgrp)
+			rctl |= E1000_RCTL_VFE;
+	}
 	wr32(E1000_RCTL, rctl);
 
 	if (!netdev->mc_count) {
@@ -4220,7 +4224,8 @@ static void igb_vlan_rx_register(struct net_device *netdev,
 
 		/* enable VLAN receive filtering */
 		rctl = rd32(E1000_RCTL);
-		rctl |= E1000_RCTL_VFE;
+		if (!(netdev->flags & IFF_PROMISC))
+			rctl |= E1000_RCTL_VFE;
 		rctl &= ~E1000_RCTL_CFIEN;
 		wr32(E1000_RCTL, rctl);
 		igb_update_mng_vlan(adapter);
diff --git a/drivers/net/ixgb/ixgb_main.c b/drivers/net/ixgb/ixgb_main.c
index e83feaf..ec95cd4 100644
--- a/drivers/net/ixgb/ixgb_main.c
+++ b/drivers/net/ixgb/ixgb_main.c
@@ -1053,11 +1053,16 @@ ixgb_set_multi(struct net_device *netdev)
 
 	if (netdev->flags & IFF_PROMISC) {
 		rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
-	} else if (netdev->flags & IFF_ALLMULTI) {
-		rctl |= IXGB_RCTL_MPE;
-		rctl &= ~IXGB_RCTL_UPE;
+		rctl &= ~IXGB_RCTL_VFE;
 	} else {
-		rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
+		if (netdev->flags & IFF_ALLMULTI) {
+			rctl |= IXGB_RCTL_MPE;
+			rctl &= ~IXGB_RCTL_UPE;
+		} else {
+			rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
+		}
+		if (adapter->vlgrp)
+			rctl |= IXGB_RCTL_VFE;
 	}
 
 	if (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
@@ -2104,7 +2109,8 @@ ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
 		/* enable VLAN receive filtering */
 
 		rctl = IXGB_READ_REG(&adapter->hw, RCTL);
-		rctl |= IXGB_RCTL_VFE;
+		if (!(netdev->flags & IFF_PROMISC))
+			rctl |= IXGB_RCTL_VFE;
 		rctl &= ~IXGB_RCTL_CFIEN;
 		IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 	} else {
diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
index 10a1c8c..afe3a1c 100644
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/drivers/net/ixgbe/ixgbe_main.c
@@ -1574,7 +1574,9 @@ static void ixgbe_vlan_rx_register(struct net_device *netdev,
 	if (grp) {
 		/* enable VLAN tag insert/strip */
 		ctrl = IXGBE_READ_REG(&adapter->hw, IXGBE_VLNCTRL);
-		ctrl |= IXGBE_VLNCTRL_VME | IXGBE_VLNCTRL_VFE;
+		ctrl |= IXGBE_VLNCTRL_VME;
+		if (!(netdev->flags & IFF_PROMISC))
+			ctrl |= IXGBE_VLNCTRL_VFE;
 		ctrl &= ~IXGBE_VLNCTRL_CFIEN;
 		IXGBE_WRITE_REG(&adapter->hw, IXGBE_VLNCTRL, ctrl);
 	}
@@ -1645,11 +1647,16 @@ static void ixgbe_set_multi(struct net_device *netdev)
 
 	if (netdev->flags & IFF_PROMISC) {
 		fctrl |= (IXGBE_FCTRL_UPE | IXGBE_FCTRL_MPE);
-	} else if (netdev->flags & IFF_ALLMULTI) {
-		fctrl |= IXGBE_FCTRL_MPE;
-		fctrl &= ~IXGBE_FCTRL_UPE;
+		fctrl &= ~IXGBE_VLNCTRL_VFE;
 	} else {
-		fctrl &= ~(IXGBE_FCTRL_UPE | IXGBE_FCTRL_MPE);
+		if (netdev->flags & IFF_ALLMULTI) {
+			fctrl |= IXGBE_FCTRL_MPE;
+			fctrl &= ~IXGBE_FCTRL_UPE;
+		} else {
+			fctrl &= ~(IXGBE_FCTRL_UPE | IXGBE_FCTRL_MPE);
+		}
+		if (adapter->vlgrp)
+			fctrl |= IXGBE_VLNCTRL_VFE;
 	}
 
 	IXGBE_WRITE_REG(hw, IXGBE_FCTRL, fctrl);

[PATCH 2/2]: netdrv intel: always enable VLAN filtering except in promiscous mode

[Patrick McHardy]

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commit 6e3767e854209df125d7c2d70f23ae97ab61e5f2
Author: Patrick McHardy <kaber@trash.net>
Date:   Wed Jul 16 11:05:21 2008 +0200

    netdrv intel: always enable VLAN filtering except in promiscous mode
    
    Currently VLAN filtering is enabled when the first VLAN is added.
    Obviously before that there's no point in receiving any VLAN packets.
    Now that we disable VLAN filtering in promiscous mode, we can keep
    the VLAN filters enabled the remaining time.
    
    Signed-off-by: Patrick McHardy <kaber@trash.net>

diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index 80e3a65..f8df8bd 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -2484,7 +2484,7 @@ e1000_set_rx_mode(struct net_device *netdev)
 		} else {
 			rctl &= ~E1000_RCTL_MPE;
 		}
-		if (adapter->vlgrp && adapter->hw.mac_type != e1000_ich8lan)
+		if (adapter->hw.mac_type != e1000_ich8lan)
 			rctl |= E1000_RCTL_VFE;
 	}
 
@@ -4967,8 +4967,6 @@ e1000_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
 		if (adapter->hw.mac_type != e1000_ich8lan) {
 			/* enable VLAN receive filtering */
 			rctl = E1000_READ_REG(&adapter->hw, RCTL);
-			if (!(netdev->flags & IFF_PROMISC))
-				rctl |= E1000_RCTL_VFE;
 			rctl &= ~E1000_RCTL_CFIEN;
 			E1000_WRITE_REG(&adapter->hw, RCTL, rctl);
 			e1000_update_mng_vlan(adapter);
@@ -4980,10 +4978,6 @@ e1000_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
 		E1000_WRITE_REG(&adapter->hw, CTRL, ctrl);
 
 		if (adapter->hw.mac_type != e1000_ich8lan) {
-			/* disable VLAN filtering */
-			rctl = E1000_READ_REG(&adapter->hw, RCTL);
-			rctl &= ~E1000_RCTL_VFE;
-			E1000_WRITE_REG(&adapter->hw, RCTL, rctl);
 			if (adapter->mng_vlan_id !=
 			    (u16)E1000_MNG_VLAN_NONE) {
 				e1000_vlan_rx_kill_vid(netdev,
diff --git a/drivers/net/e1000e/netdev.c b/drivers/net/e1000e/netdev.c
index 3fe6026..be59533 100644
--- a/drivers/net/e1000e/netdev.c
+++ b/drivers/net/e1000e/netdev.c
@@ -1792,8 +1792,6 @@ static void e1000_vlan_rx_register(struct net_device *netdev,
 		if (adapter->flags & FLAG_HAS_HW_VLAN_FILTER) {
 			/* enable VLAN receive filtering */
 			rctl = er32(RCTL);
-			if (!(netdev->flags & IFF_PROMISC))
-				rctl |= E1000_RCTL_VFE;
 			rctl &= ~E1000_RCTL_CFIEN;
 			ew32(RCTL, rctl);
 			e1000_update_mng_vlan(adapter);
@@ -1805,10 +1803,6 @@ static void e1000_vlan_rx_register(struct net_device *netdev,
 		ew32(CTRL, ctrl);
 
 		if (adapter->flags & FLAG_HAS_HW_VLAN_FILTER) {
-			/* disable VLAN filtering */
-			rctl = er32(RCTL);
-			rctl &= ~E1000_RCTL_VFE;
-			ew32(RCTL, rctl);
 			if (adapter->mng_vlan_id !=
 			    (u16)E1000_MNG_VLAN_NONE) {
 				e1000_vlan_rx_kill_vid(netdev,
@@ -2239,7 +2233,7 @@ static void e1000_set_multi(struct net_device *netdev)
 		} else {
 			rctl &= ~(E1000_RCTL_UPE | E1000_RCTL_MPE);
 		}
-		if (adapter->vlgrp && adapter->flags & FLAG_HAS_HW_VLAN_FILTER)
+		if (adapter->flags & FLAG_HAS_HW_VLAN_FILTER)
 			rctl |= E1000_RCTL_VFE;
 	}
 
diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index 1ab8e3e..74dc43e 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -2277,8 +2277,7 @@ static void igb_set_multi(struct net_device *netdev)
 			rctl &= ~E1000_RCTL_UPE;
 		} else
 			rctl &= ~(E1000_RCTL_UPE | E1000_RCTL_MPE);
-		if (adapter->vlgrp)
-			rctl |= E1000_RCTL_VFE;
+		rctl |= E1000_RCTL_VFE;
 	}
 	wr32(E1000_RCTL, rctl);
 
@@ -4224,8 +4223,6 @@ static void igb_vlan_rx_register(struct net_device *netdev,
 
 		/* enable VLAN receive filtering */
 		rctl = rd32(E1000_RCTL);
-		if (!(netdev->flags & IFF_PROMISC))
-			rctl |= E1000_RCTL_VFE;
 		rctl &= ~E1000_RCTL_CFIEN;
 		wr32(E1000_RCTL, rctl);
 		igb_update_mng_vlan(adapter);
@@ -4237,10 +4234,6 @@ static void igb_vlan_rx_register(struct net_device *netdev,
 		ctrl &= ~E1000_CTRL_VME;
 		wr32(E1000_CTRL, ctrl);
 
-		/* disable VLAN filtering */
-		rctl = rd32(E1000_RCTL);
-		rctl &= ~E1000_RCTL_VFE;
-		wr32(E1000_RCTL, rctl);
 		if (adapter->mng_vlan_id != (u16)IGB_MNG_VLAN_NONE) {
 			igb_vlan_rx_kill_vid(netdev, adapter->mng_vlan_id);
 			adapter->mng_vlan_id = IGB_MNG_VLAN_NONE;
diff --git a/drivers/net/ixgb/ixgb_main.c b/drivers/net/ixgb/ixgb_main.c
index ec95cd4..aa75385 100644
--- a/drivers/net/ixgb/ixgb_main.c
+++ b/drivers/net/ixgb/ixgb_main.c
@@ -1061,8 +1061,7 @@ ixgb_set_multi(struct net_device *netdev)
 		} else {
 			rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
 		}
-		if (adapter->vlgrp)
-			rctl |= IXGB_RCTL_VFE;
+		rctl |= IXGB_RCTL_VFE;
 	}
 
 	if (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
@@ -2109,8 +2108,6 @@ ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
 		/* enable VLAN receive filtering */
 
 		rctl = IXGB_READ_REG(&adapter->hw, RCTL);
-		if (!(netdev->flags & IFF_PROMISC))
-			rctl |= IXGB_RCTL_VFE;
 		rctl &= ~IXGB_RCTL_CFIEN;
 		IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 	} else {
@@ -2119,12 +2116,6 @@ ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
 		ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
 		ctrl &= ~IXGB_CTRL0_VME;
 		IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
-
-		/* disable VLAN filtering */
-
-		rctl = IXGB_READ_REG(&adapter->hw, RCTL);
-		rctl &= ~IXGB_RCTL_VFE;
-		IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 	}
 
 	/* don't enable interrupts unless we are UP */
diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
index afe3a1c..7d8bf94 100644
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/drivers/net/ixgbe/ixgbe_main.c
@@ -1575,8 +1575,6 @@ static void ixgbe_vlan_rx_register(struct net_device *netdev,
 		/* enable VLAN tag insert/strip */
 		ctrl = IXGBE_READ_REG(&adapter->hw, IXGBE_VLNCTRL);
 		ctrl |= IXGBE_VLNCTRL_VME;
-		if (!(netdev->flags & IFF_PROMISC))
-			ctrl |= IXGBE_VLNCTRL_VFE;
 		ctrl &= ~IXGBE_VLNCTRL_CFIEN;
 		IXGBE_WRITE_REG(&adapter->hw, IXGBE_VLNCTRL, ctrl);
 	}
@@ -1655,8 +1653,7 @@ static void ixgbe_set_multi(struct net_device *netdev)
 		} else {
 			fctrl &= ~(IXGBE_FCTRL_UPE | IXGBE_FCTRL_MPE);
 		}
-		if (adapter->vlgrp)
-			fctrl |= IXGBE_VLNCTRL_VFE;
+		fctrl |= IXGBE_VLNCTRL_VFE;
 	}
 
 	IXGBE_WRITE_REG(hw, IXGBE_FCTRL, fctrl);

Re: [PATCH 0/2]: VLAN filtering fixes

[Jeff Kirsher]

On Wed, Jul 16, 2008 at 2:43 AM, Patrick McHardy <kaber@trash.net> wrote:
> These two patches contain the last bits of my VLAN + tcpdump fixes.
> Currently some (all?) drivers have inconsistent behaviour wrt. VLAN
> filtering and promiscous mode:
>
> They start with disabled VLAN filtering, meaning all VLAN packets
> are received on packet sockets. When adding the first VLAN, VLAN
> filtering is enabled and only packets for locally configured VLANs
> are received, even in promiscous mode. In most cases VLAN filtering
> is disabled again when removing the last VLAN, igxbe keeps it enabled
> permanently however.
>
> These patches change the Intel drivers to always enable VLAN filtering
> while not in promiscous mode since there is little point in receiving
> VLAN packets while nothing is interested in them, but disable filtering
> while in promiscous mode so all VLANs are visible to packet sockets.
>
> There are four more drivers that support VLAN filtering that I didn't
> adapt to this behaviour since I'm not sure about what exactly they
> currently do. All four of tehuti, starfire, ehea and via-velocity
> have a flag for the hardware to enable promiscous mode, its unknown
> to me whether this also automatically disables VLAN filtering.
> Any information on this someone might have is appreciated.
>
> --
> To unsubscribe from this list: send the line "unsubscribe netdev" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>

Acked-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Acked-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>


-- 
Cheers,
Jeff

Re: [PATCH 0/2]: VLAN filtering fixes

[David Miller]

From: "Jeff Kirsher" <jeffrey.t.kirsher@intel.com>
Date: Wed, 16 Jul 2008 14:03:33 -0700

> On Wed, Jul 16, 2008 at 2:43 AM, Patrick McHardy <kaber@trash.net> wrote:
> > These two patches contain the last bits of my VLAN + tcpdump fixes.
> > Currently some (all?) drivers have inconsistent behaviour wrt. VLAN
> > filtering and promiscous mode:
 ...
> Acked-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
> Acked-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>

I've applied Patrick's patches, thanks everyone.