: VLAN filtering fixes

PATCH Applied Patrick McHardy 3 participants 5 messages Jul 16, 2008 – Jul 17, 2008

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Networking Network drivers

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Patrick McHardy

author

2008-07-16 09:43 UTC #0 lore raw

cover : VLAN filtering fixes

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.

Patrick McHardy

author

2008-07-16 09:44 UTC #1 lore raw

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

commit acec641127a35c44173d243ef300f7fa6cbec646

Author: Patrick McHardy <[email protected]>
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/[email protected]/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 <[email protected]>

drivers/net/e1000/e1000_main.c +10 -4

index 7aa458f..80e3a65 100644
@@ -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);

drivers/net/e1000e/netdev.c +11 -5

index 80592bd..3fe6026 100644
@@ -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);

drivers/net/igb/igb_main.c +13 -8

index aaed129..1ab8e3e 100644
@@ -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);

drivers/net/ixgb/ixgb_main.c +11 -5

index e83feaf..ec95cd4 100644
@@ -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 {

drivers/net/ixgbe/ixgbe_main.c +12 -5

index 10a1c8c..afe3a1c 100644
@@ -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);

Patrick McHardy

author

2008-07-16 09:44 UTC #2 lore raw

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

In reply to Patrick McHardy

commit 6e3767e854209df125d7c2d70f23ae97ab61e5f2

Author: Patrick McHardy <[email protected]>
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 <[email protected]>

drivers/net/e1000/e1000_main.c +1 -7

index 80e3a65..f8df8bd 100644
@@ -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,

drivers/net/e1000e/netdev.c +1 -7

index 3fe6026..be59533 100644
@@ -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;
 	}

drivers/net/igb/igb_main.c +1 -8

index 1ab8e3e..74dc43e 100644
@@ -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;

drivers/net/ixgb/ixgb_main.c +1 ~~-10~~

index ec95cd4..aa75385 100644
@@ -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 */

drivers/net/ixgbe/ixgbe_main.c +1 -4

index afe3a1c..7d8bf94 100644
@@ -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);

Jeff Kirsher

Acked-by Acked-by Peter P Waskiewicz Jr on the v1 series

2008-07-16 21:03 UTC #3 lore raw

In reply to Patrick McHardy

Quoted 23 lines · 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.

Quoted 5 lines

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To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html

Acked-by Jeff Kirsher <[email protected]>

Acked-by Peter P Waskiewicz Jr <[email protected]>

Signature · 2 lines

Cheers,
Jeff

David Miller

maintainer Applied

2008-07-17 03:16 UTC #4 lore raw

From: "Jeff Kirsher" <[email protected]>
Date: Wed, 16 Jul 2008 14:03:33 -0700

Quoted 4 lines · Patrick McHardy

Quoted 3 lines
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:

...

Quoted 2 lines

Acked-by Jeff Kirsher <[email protected]>
Acked-by Peter P Waskiewicz Jr <[email protected]>

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