[PATCH net-next v3 0/5] net: support binding vlan dev link state to vlan member bridge ports

[PATCH net-next v3 0/5] net: support binding vlan dev link state to vlan member bridge ports

[Mike Manning]

For vlan filtering on bridges, the bridge may also have vlan devices
as upper devices. For switches, these are used to provide L3 packet
processing for ports that are members of a given vlan.

While it is correct that the admin state for these vlan devices is
either set directly for the device or inherited from the lower device,
the link state is also transferred from the lower device. So this is
always up if the bridge is in admin up state and there is at least one
bridge port that is up, regardless of the vlan that the port is in.

The link state of the vlan device may need to track only the state of
the subset of ports that are also members of the corresponding vlan,
rather than that of all ports.

This series provides an optional vlan flag so that the link state of
the vlan device is only up if there is at least one bridge port that is
up AND is a member of the corresponding vlan.

v2:
   - Address review comments from Nikolay Aleksandrov
     in patches 3 & 4 and add patch 5 to address bridge link down due to STP
v3:
   - Address review comment from Nikolay Aleksandrov
     in patch 4 so as to remove unnecessary inline #ifdef

Mike Manning (5):
  vlan: support binding link state to vlan member bridge ports
  vlan: do not transfer link state in vlan bridge binding mode
  bridge: support binding vlan dev link state to vlan member bridge
    ports
  bridge: update vlan dev state when port added to or deleted from vlan
  bridge: update vlan dev link state for bridge netdev changes

 include/uapi/linux/if_vlan.h |   9 +-
 net/8021q/vlan.c             |  18 +++-
 net/8021q/vlan_dev.c         |  22 +++--
 net/8021q/vlan_netlink.c     |   3 +-
 net/bridge/br.c              |  13 ++-
 net/bridge/br_private.h      |  14 +++
 net/bridge/br_vlan.c         | 214 +++++++++++++++++++++++++++++++++++++++++++
 7 files changed, 272 insertions(+), 21 deletions(-)

-- 
2.11.0

[PATCH net-next v3 1/5] vlan: support binding link state to vlan member bridge ports

[Mike Manning]

In the case of vlan filtering on bridges, the bridge may also have the
corresponding vlan devices as upper devices. Currently the link state
of vlan devices is transferred from the lower device. So this is up if
the bridge is in admin up state and there is at least one bridge port
that is up, regardless of the vlan that the port is a member of.

The link state of the vlan device may need to track only the state of
the subset of ports that are also members of the corresponding vlan,
rather than that of all ports.

Add a flag to specify a vlan bridge binding mode, by which the link
state is no longer automatically transferred from the lower device,
but is instead determined by the bridge ports that are members of the
vlan.

Signed-off-by: Mike Manning <mmanning@vyatta.att-mail.com>
---
 include/uapi/linux/if_vlan.h | 9 +++++----
 net/8021q/vlan_dev.c         | 3 ++-
 net/8021q/vlan_netlink.c     | 3 ++-
 3 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/include/uapi/linux/if_vlan.h b/include/uapi/linux/if_vlan.h
index 7a0e8bd65b6b..90a2c89afc8f 100644
--- a/include/uapi/linux/if_vlan.h
+++ b/include/uapi/linux/if_vlan.h
@@ -32,10 +32,11 @@ enum vlan_ioctl_cmds {
 };
 
 enum vlan_flags {
-	VLAN_FLAG_REORDER_HDR	= 0x1,
-	VLAN_FLAG_GVRP		= 0x2,
-	VLAN_FLAG_LOOSE_BINDING	= 0x4,
-	VLAN_FLAG_MVRP		= 0x8,
+	VLAN_FLAG_REORDER_HDR		= 0x1,
+	VLAN_FLAG_GVRP			= 0x2,
+	VLAN_FLAG_LOOSE_BINDING		= 0x4,
+	VLAN_FLAG_MVRP			= 0x8,
+	VLAN_FLAG_BRIDGE_BINDING	= 0x10,
 };
 
 enum vlan_name_types {
diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index 8d77b6ee4477..ed996b500b10 100644
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -223,7 +223,8 @@ int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
 	u32 old_flags = vlan->flags;
 
 	if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
-		     VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP))
+		     VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP |
+		     VLAN_FLAG_BRIDGE_BINDING))
 		return -EINVAL;
 
 	vlan->flags = (old_flags & ~mask) | (flags & mask);
diff --git a/net/8021q/vlan_netlink.c b/net/8021q/vlan_netlink.c
index 9b60c1e399e2..a624dccf68fd 100644
--- a/net/8021q/vlan_netlink.c
+++ b/net/8021q/vlan_netlink.c
@@ -84,7 +84,8 @@ static int vlan_validate(struct nlattr *tb[], struct nlattr *data[],
 		flags = nla_data(data[IFLA_VLAN_FLAGS]);
 		if ((flags->flags & flags->mask) &
 		    ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
-		      VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP)) {
+		      VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP |
+		      VLAN_FLAG_BRIDGE_BINDING)) {
 			NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN flags");
 			return -EINVAL;
 		}
-- 
2.11.0

Re: [PATCH net-next v3 1/5] vlan: support binding link state to vlan member bridge ports

[Nikolay Aleksandrov]

On 18/04/2019 20:35, Mike Manning wrote:
> In the case of vlan filtering on bridges, the bridge may also have the
> corresponding vlan devices as upper devices. Currently the link state
> of vlan devices is transferred from the lower device. So this is up if
> the bridge is in admin up state and there is at least one bridge port
> that is up, regardless of the vlan that the port is a member of.
> 
> The link state of the vlan device may need to track only the state of
> the subset of ports that are also members of the corresponding vlan,
> rather than that of all ports.
> 
> Add a flag to specify a vlan bridge binding mode, by which the link
> state is no longer automatically transferred from the lower device,
> but is instead determined by the bridge ports that are members of the
> vlan.
> 
> Signed-off-by: Mike Manning <mmanning@vyatta.att-mail.com>
> ---
>  include/uapi/linux/if_vlan.h | 9 +++++----
>  net/8021q/vlan_dev.c         | 3 ++-
>  net/8021q/vlan_netlink.c     | 3 ++-
>  3 files changed, 9 insertions(+), 6 deletions(-)
> 

Acked-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>

[PATCH net-next v3 2/5] vlan: do not transfer link state in vlan bridge binding mode

[Mike Manning]

In vlan bridge binding mode, the link state is no longer transferred
from the lower device. Instead it is set by the bridge module according
to the state of bridge ports that are members of the vlan.

Signed-off-by: Mike Manning <mmanning@vyatta.att-mail.com>
---
 net/8021q/vlan.c     | 18 ++++++++++++++----
 net/8021q/vlan_dev.c | 19 ++++++++++++-------
 2 files changed, 26 insertions(+), 11 deletions(-)

diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index dc4411165e43..1f99678751df 100644
--- a/net/8021q/vlan.c
+++ b/net/8021q/vlan.c
@@ -75,6 +75,14 @@ static int vlan_group_prealloc_vid(struct vlan_group *vg,
 	return 0;
 }
 
+static void vlan_stacked_transfer_operstate(const struct net_device *rootdev,
+					    struct net_device *dev,
+					    struct vlan_dev_priv *vlan)
+{
+	if (!(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
+		netif_stacked_transfer_operstate(rootdev, dev);
+}
+
 void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
 {
 	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
@@ -180,7 +188,7 @@ int register_vlan_dev(struct net_device *dev, struct netlink_ext_ack *extack)
 	/* Account for reference in struct vlan_dev_priv */
 	dev_hold(real_dev);
 
-	netif_stacked_transfer_operstate(real_dev, dev);
+	vlan_stacked_transfer_operstate(real_dev, dev, vlan);
 	linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
 
 	/* So, got the sucker initialized, now lets place
@@ -399,7 +407,8 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 	case NETDEV_CHANGE:
 		/* Propagate real device state to vlan devices */
 		vlan_group_for_each_dev(grp, i, vlandev)
-			netif_stacked_transfer_operstate(dev, vlandev);
+			vlan_stacked_transfer_operstate(dev, vlandev,
+							vlan_dev_priv(vlandev));
 		break;
 
 	case NETDEV_CHANGEADDR:
@@ -446,7 +455,8 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 		dev_close_many(&close_list, false);
 
 		list_for_each_entry_safe(vlandev, tmp, &close_list, close_list) {
-			netif_stacked_transfer_operstate(dev, vlandev);
+			vlan_stacked_transfer_operstate(dev, vlandev,
+							vlan_dev_priv(vlandev));
 			list_del_init(&vlandev->close_list);
 		}
 		list_del(&close_list);
@@ -463,7 +473,7 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 			if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 				dev_change_flags(vlandev, flgs | IFF_UP,
 						 extack);
-			netif_stacked_transfer_operstate(dev, vlandev);
+			vlan_stacked_transfer_operstate(dev, vlandev, vlan);
 		}
 		break;
 
diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index ed996b500b10..f044ae56a313 100644
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -297,7 +297,8 @@ static int vlan_dev_open(struct net_device *dev)
 	if (vlan->flags & VLAN_FLAG_MVRP)
 		vlan_mvrp_request_join(dev);
 
-	if (netif_carrier_ok(real_dev))
+	if (netif_carrier_ok(real_dev) &&
+	    !(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
 		netif_carrier_on(dev);
 	return 0;
 
@@ -327,7 +328,8 @@ static int vlan_dev_stop(struct net_device *dev)
 	if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 		dev_uc_del(real_dev, dev->dev_addr);
 
-	netif_carrier_off(dev);
+	if (!(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
+		netif_carrier_off(dev);
 	return 0;
 }
 
@@ -551,7 +553,8 @@ static const struct net_device_ops vlan_netdev_ops;
 
 static int vlan_dev_init(struct net_device *dev)
 {
-	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
+	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
+	struct net_device *real_dev = vlan->real_dev;
 
 	netif_carrier_off(dev);
 
@@ -562,6 +565,9 @@ static int vlan_dev_init(struct net_device *dev)
 					  (1<<__LINK_STATE_DORMANT))) |
 		      (1<<__LINK_STATE_PRESENT);
 
+	if (vlan->flags & VLAN_FLAG_BRIDGE_BINDING)
+		dev->state |= (1 << __LINK_STATE_NOCARRIER);
+
 	dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG |
 			   NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE |
 			   NETIF_F_GSO_ENCAP_ALL |
@@ -592,8 +598,7 @@ static int vlan_dev_init(struct net_device *dev)
 #endif
 
 	dev->needed_headroom = real_dev->needed_headroom;
-	if (vlan_hw_offload_capable(real_dev->features,
-				    vlan_dev_priv(dev)->vlan_proto)) {
+	if (vlan_hw_offload_capable(real_dev->features, vlan->vlan_proto)) {
 		dev->header_ops      = &vlan_passthru_header_ops;
 		dev->hard_header_len = real_dev->hard_header_len;
 	} else {
@@ -607,8 +612,8 @@ static int vlan_dev_init(struct net_device *dev)
 
 	vlan_dev_set_lockdep_class(dev, vlan_dev_get_lock_subclass(dev));
 
-	vlan_dev_priv(dev)->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
-	if (!vlan_dev_priv(dev)->vlan_pcpu_stats)
+	vlan->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
+	if (!vlan->vlan_pcpu_stats)
 		return -ENOMEM;
 
 	return 0;
-- 
2.11.0

Re: [PATCH net-next v3 2/5] vlan: do not transfer link state in vlan bridge binding mode

[Nikolay Aleksandrov]

On 18/04/2019 20:35, Mike Manning wrote:
> In vlan bridge binding mode, the link state is no longer transferred
> from the lower device. Instead it is set by the bridge module according
> to the state of bridge ports that are members of the vlan.
> 
> Signed-off-by: Mike Manning <mmanning@vyatta.att-mail.com>
> ---
>  net/8021q/vlan.c     | 18 ++++++++++++++----
>  net/8021q/vlan_dev.c | 19 ++++++++++++-------
>  2 files changed, 26 insertions(+), 11 deletions(-)
> 

Acked-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>

[PATCH net-next v3 3/5] bridge: support binding vlan dev link state to vlan member bridge ports

[Mike Manning]

In the case of vlan filtering on bridges, the bridge may also have the
corresponding vlan devices as upper devices. A vlan bridge binding mode
is added to allow the link state of the vlan device to track only the
state of the subset of bridge ports that are also members of the vlan,
rather than that of all bridge ports. This mode is set with a vlan flag
rather than a bridge sysfs so that the 8021q module is aware that it
should not set the link state for the vlan device.

If bridge vlan is configured, the bridge device event handling results
in the link state for an upper device being set, if it is a vlan device
with the vlan bridge binding mode enabled. This also sets a
vlan_bridge_binding flag so that subsequent UP/DOWN/CHANGE events for
the ports in that bridge result in a link state update of the vlan
device if required.

The link state of the vlan device is up if there is at least one bridge
port that is a vlan member that is admin & oper up, otherwise its oper
state is IF_OPER_LOWERLAYERDOWN.

Signed-off-by: Mike Manning <mmanning@vyatta.att-mail.com>
---
 net/bridge/br.c         |  13 +++--
 net/bridge/br_private.h |  14 +++++
 net/bridge/br_vlan.c    | 151 ++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 174 insertions(+), 4 deletions(-)

diff --git a/net/bridge/br.c b/net/bridge/br.c
index a5174e5001d8..e69fc87a13e0 100644
--- a/net/bridge/br.c
+++ b/net/bridge/br.c
@@ -40,10 +40,13 @@ static int br_device_event(struct notifier_block *unused, unsigned long event, v
 	bool changed_addr;
 	int err;
 
-	/* register of bridge completed, add sysfs entries */
-	if ((dev->priv_flags & IFF_EBRIDGE) && event == NETDEV_REGISTER) {
-		br_sysfs_addbr(dev);
-		return NOTIFY_DONE;
+	if (dev->priv_flags & IFF_EBRIDGE) {
+		if (event == NETDEV_REGISTER) {
+			/* register of bridge completed, add sysfs entries */
+			br_sysfs_addbr(dev);
+			return NOTIFY_DONE;
+		}
+		br_vlan_bridge_event(dev, event, ptr);
 	}
 
 	/* not a port of a bridge */
@@ -126,6 +129,8 @@ static int br_device_event(struct notifier_block *unused, unsigned long event, v
 		break;
 	}
 
+	br_vlan_port_event(p, event);
+
 	/* Events that may cause spanning tree to refresh */
 	if (!notified && (event == NETDEV_CHANGEADDR || event == NETDEV_UP ||
 			  event == NETDEV_CHANGE || event == NETDEV_DOWN))
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 4bea2f11da9b..334a8c496b50 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -321,6 +321,7 @@ enum net_bridge_opts {
 	BROPT_MTU_SET_BY_USER,
 	BROPT_VLAN_STATS_PER_PORT,
 	BROPT_NO_LL_LEARN,
+	BROPT_VLAN_BRIDGE_BINDING,
 };
 
 struct net_bridge {
@@ -895,6 +896,9 @@ int nbp_vlan_init(struct net_bridge_port *port, struct netlink_ext_ack *extack);
 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask);
 void br_vlan_get_stats(const struct net_bridge_vlan *v,
 		       struct br_vlan_stats *stats);
+void br_vlan_port_event(struct net_bridge_port *p, unsigned long event);
+void br_vlan_bridge_event(struct net_device *dev, unsigned long event,
+			  void *ptr);
 
 static inline struct net_bridge_vlan_group *br_vlan_group(
 					const struct net_bridge *br)
@@ -1078,6 +1082,16 @@ static inline void br_vlan_get_stats(const struct net_bridge_vlan *v,
 				     struct br_vlan_stats *stats)
 {
 }
+
+static inline void br_vlan_port_event(struct net_bridge_port *p,
+				      unsigned long event)
+{
+}
+
+static inline void br_vlan_bridge_event(struct net_device *dev,
+					unsigned long event, void *ptr)
+{
+}
 #endif
 
 struct nf_br_ops {
diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
index 0a02822b5667..b903689a8fc5 100644
--- a/net/bridge/br_vlan.c
+++ b/net/bridge/br_vlan.c
@@ -1264,3 +1264,154 @@ int br_vlan_get_info(const struct net_device *dev, u16 vid,
 	return 0;
 }
 EXPORT_SYMBOL_GPL(br_vlan_get_info);
+
+static int br_vlan_is_bind_vlan_dev(const struct net_device *dev)
+{
+	return is_vlan_dev(dev) &&
+		!!(vlan_dev_priv(dev)->flags & VLAN_FLAG_BRIDGE_BINDING);
+}
+
+static int br_vlan_is_bind_vlan_dev_fn(struct net_device *dev,
+				       __always_unused void *data)
+{
+	return br_vlan_is_bind_vlan_dev(dev);
+}
+
+static bool br_vlan_has_upper_bind_vlan_dev(struct net_device *dev)
+{
+	int found;
+
+	rcu_read_lock();
+	found = netdev_walk_all_upper_dev_rcu(dev, br_vlan_is_bind_vlan_dev_fn,
+					      NULL);
+	rcu_read_unlock();
+
+	return !!found;
+}
+
+struct br_vlan_bind_walk_data {
+	u16 vid;
+	struct net_device *result;
+};
+
+static int br_vlan_match_bind_vlan_dev_fn(struct net_device *dev,
+					  void *data_in)
+{
+	struct br_vlan_bind_walk_data *data = data_in;
+	int found = 0;
+
+	if (br_vlan_is_bind_vlan_dev(dev) &&
+	    vlan_dev_priv(dev)->vlan_id == data->vid) {
+		data->result = dev;
+		found = 1;
+	}
+
+	return found;
+}
+
+static struct net_device *
+br_vlan_get_upper_bind_vlan_dev(struct net_device *dev, u16 vid)
+{
+	struct br_vlan_bind_walk_data data = {
+		.vid = vid,
+	};
+
+	rcu_read_lock();
+	netdev_walk_all_upper_dev_rcu(dev, br_vlan_match_bind_vlan_dev_fn,
+				      &data);
+	rcu_read_unlock();
+
+	return data.result;
+}
+
+static bool br_vlan_is_dev_up(const struct net_device *dev)
+{
+	return  !!(dev->flags & IFF_UP) && netif_oper_up(dev);
+}
+
+static void br_vlan_set_vlan_dev_state(const struct net_bridge *br,
+				       struct net_device *vlan_dev)
+{
+	u16 vid = vlan_dev_priv(vlan_dev)->vlan_id;
+	struct net_bridge_vlan_group *vg;
+	struct net_bridge_port *p;
+	bool has_carrier = false;
+
+	list_for_each_entry(p, &br->port_list, list) {
+		vg = nbp_vlan_group(p);
+		if (br_vlan_find(vg, vid) && br_vlan_is_dev_up(p->dev)) {
+			has_carrier = true;
+			break;
+		}
+	}
+
+	if (has_carrier)
+		netif_carrier_on(vlan_dev);
+	else
+		netif_carrier_off(vlan_dev);
+}
+
+static void br_vlan_set_all_vlan_dev_state(struct net_bridge_port *p)
+{
+	struct net_bridge_vlan_group *vg = nbp_vlan_group(p);
+	struct net_bridge_vlan *vlan;
+	struct net_device *vlan_dev;
+
+	list_for_each_entry(vlan, &vg->vlan_list, vlist) {
+		vlan_dev = br_vlan_get_upper_bind_vlan_dev(p->br->dev,
+							   vlan->vid);
+		if (vlan_dev) {
+			if (br_vlan_is_dev_up(p->dev))
+				netif_carrier_on(vlan_dev);
+			else
+				br_vlan_set_vlan_dev_state(p->br, vlan_dev);
+		}
+	}
+}
+
+static void br_vlan_upper_change(struct net_device *dev,
+				 struct net_device *upper_dev,
+				 bool linking)
+{
+	struct net_bridge *br = netdev_priv(dev);
+
+	if (!br_vlan_is_bind_vlan_dev(upper_dev))
+		return;
+
+	if (linking) {
+		br_vlan_set_vlan_dev_state(br, upper_dev);
+		br_opt_toggle(br, BROPT_VLAN_BRIDGE_BINDING, true);
+	} else {
+		br_opt_toggle(br, BROPT_VLAN_BRIDGE_BINDING,
+			      br_vlan_has_upper_bind_vlan_dev(dev));
+	}
+}
+
+/* Must be protected by RTNL. */
+void br_vlan_bridge_event(struct net_device *dev, unsigned long event,
+			  void *ptr)
+{
+	struct netdev_notifier_changeupper_info *info;
+
+	switch (event) {
+	case NETDEV_CHANGEUPPER:
+		info = ptr;
+		br_vlan_upper_change(dev, info->upper_dev, info->linking);
+		break;
+	}
+}
+
+/* Must be protected by RTNL. */
+void br_vlan_port_event(struct net_bridge_port *p, unsigned long event)
+{
+	if (!br_opt_get(p->br, BROPT_VLAN_BRIDGE_BINDING))
+		return;
+
+	switch (event) {
+	case NETDEV_CHANGE:
+	case NETDEV_DOWN:
+	case NETDEV_UP:
+		br_vlan_set_all_vlan_dev_state(p);
+		break;
+	}
+}
-- 
2.11.0

Re: [PATCH net-next v3 3/5] bridge: support binding vlan dev link state to vlan member bridge ports

[Nikolay Aleksandrov]

On 18/04/2019 20:35, Mike Manning wrote:
> In the case of vlan filtering on bridges, the bridge may also have the
> corresponding vlan devices as upper devices. A vlan bridge binding mode
> is added to allow the link state of the vlan device to track only the
> state of the subset of bridge ports that are also members of the vlan,
> rather than that of all bridge ports. This mode is set with a vlan flag
> rather than a bridge sysfs so that the 8021q module is aware that it
> should not set the link state for the vlan device.
> 
> If bridge vlan is configured, the bridge device event handling results
> in the link state for an upper device being set, if it is a vlan device
> with the vlan bridge binding mode enabled. This also sets a
> vlan_bridge_binding flag so that subsequent UP/DOWN/CHANGE events for
> the ports in that bridge result in a link state update of the vlan
> device if required.
> 
> The link state of the vlan device is up if there is at least one bridge
> port that is a vlan member that is admin & oper up, otherwise its oper
> state is IF_OPER_LOWERLAYERDOWN.
> 
> Signed-off-by: Mike Manning <mmanning@vyatta.att-mail.com>
> ---
>  net/bridge/br.c         |  13 +++--
>  net/bridge/br_private.h |  14 +++++
>  net/bridge/br_vlan.c    | 151 ++++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 174 insertions(+), 4 deletions(-)
> 

Acked-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>

[PATCH net-next v3 4/5] bridge: update vlan dev state when port added to or deleted from vlan

[Mike Manning]

If vlan bridge binding is enabled, then the link state of a vlan device
that is an upper device of the bridge should track the state of bridge
ports that are members of that vlan. So if a bridge port becomes or
stops being a member of a vlan, then update the link state of the
vlan device if necessary.

Signed-off-by: Mike Manning <mmanning@vyatta.att-mail.com>
---
 net/bridge/br_vlan.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
index b903689a8fc5..89146a5f0c23 100644
--- a/net/bridge/br_vlan.c
+++ b/net/bridge/br_vlan.c
@@ -7,6 +7,8 @@
 #include "br_private.h"
 #include "br_private_tunnel.h"
 
+static void nbp_vlan_set_vlan_dev_state(struct net_bridge_port *p, u16 vid);
+
 static inline int br_vlan_cmp(struct rhashtable_compare_arg *arg,
 			      const void *ptr)
 {
@@ -293,6 +295,9 @@ static int __vlan_add(struct net_bridge_vlan *v, u16 flags,
 
 	__vlan_add_list(v);
 	__vlan_add_flags(v, flags);
+
+	if (p)
+		nbp_vlan_set_vlan_dev_state(p, v->vid);
 out:
 	return err;
 
@@ -357,6 +362,7 @@ static int __vlan_del(struct net_bridge_vlan *v)
 		rhashtable_remove_fast(&vg->vlan_hash, &v->vnode,
 				       br_vlan_rht_params);
 		__vlan_del_list(v);
+		nbp_vlan_set_vlan_dev_state(p, v->vid);
 		call_rcu(&v->rcu, nbp_vlan_rcu_free);
 	}
 
@@ -1388,6 +1394,19 @@ static void br_vlan_upper_change(struct net_device *dev,
 }
 
 /* Must be protected by RTNL. */
+static void nbp_vlan_set_vlan_dev_state(struct net_bridge_port *p, u16 vid)
+{
+	struct net_device *vlan_dev;
+
+	if (!br_opt_get(p->br, BROPT_VLAN_BRIDGE_BINDING))
+		return;
+
+	vlan_dev = br_vlan_get_upper_bind_vlan_dev(p->br->dev, vid);
+	if (vlan_dev)
+		br_vlan_set_vlan_dev_state(p->br, vlan_dev);
+}
+
+/* Must be protected by RTNL. */
 void br_vlan_bridge_event(struct net_device *dev, unsigned long event,
 			  void *ptr)
 {
-- 
2.11.0

Re: [PATCH net-next v3 4/5] bridge: update vlan dev state when port added to or deleted from vlan

[Nikolay Aleksandrov]

On 18/04/2019 20:35, Mike Manning wrote:
> If vlan bridge binding is enabled, then the link state of a vlan device
> that is an upper device of the bridge should track the state of bridge
> ports that are members of that vlan. So if a bridge port becomes or
> stops being a member of a vlan, then update the link state of the
> vlan device if necessary.
> 
> Signed-off-by: Mike Manning <mmanning@vyatta.att-mail.com>
> ---
>  net/bridge/br_vlan.c | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 

Acked-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>

[PATCH net-next v3 5/5] bridge: update vlan dev link state for bridge netdev changes

[Mike Manning]

If vlan bridge binding is enabled, then the link state of a vlan device
that is an upper device of the bridge tracks the state of bridge ports
that are members of that vlan. But this can only be done when the link
state of the bridge is up. If it is down, then the link state of the
vlan devices must also be down. This is to maintain existing behavior
for when STP is enabled and there are no live ports, in which case the
link state for the bridge and any vlan devices is down.

Signed-off-by: Mike Manning <mmanning@vyatta.att-mail.com>
---
 net/bridge/br_vlan.c | 50 +++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 47 insertions(+), 3 deletions(-)

diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
index 89146a5f0c23..2db63997f313 100644
--- a/net/bridge/br_vlan.c
+++ b/net/bridge/br_vlan.c
@@ -1343,6 +1343,11 @@ static void br_vlan_set_vlan_dev_state(const struct net_bridge *br,
 	struct net_bridge_port *p;
 	bool has_carrier = false;
 
+	if (!netif_carrier_ok(br->dev)) {
+		netif_carrier_off(vlan_dev);
+		return;
+	}
+
 	list_for_each_entry(p, &br->port_list, list) {
 		vg = nbp_vlan_group(p);
 		if (br_vlan_find(vg, vid) && br_vlan_is_dev_up(p->dev)) {
@@ -1367,10 +1372,12 @@ static void br_vlan_set_all_vlan_dev_state(struct net_bridge_port *p)
 		vlan_dev = br_vlan_get_upper_bind_vlan_dev(p->br->dev,
 							   vlan->vid);
 		if (vlan_dev) {
-			if (br_vlan_is_dev_up(p->dev))
-				netif_carrier_on(vlan_dev);
-			else
+			if (br_vlan_is_dev_up(p->dev)) {
+				if (netif_carrier_ok(p->br->dev))
+					netif_carrier_on(vlan_dev);
+			} else {
 				br_vlan_set_vlan_dev_state(p->br, vlan_dev);
+			}
 		}
 	}
 }
@@ -1393,6 +1400,34 @@ static void br_vlan_upper_change(struct net_device *dev,
 	}
 }
 
+struct br_vlan_link_state_walk_data {
+	struct net_bridge *br;
+};
+
+static int br_vlan_link_state_change_fn(struct net_device *vlan_dev,
+					void *data_in)
+{
+	struct br_vlan_link_state_walk_data *data = data_in;
+
+	if (br_vlan_is_bind_vlan_dev(vlan_dev))
+		br_vlan_set_vlan_dev_state(data->br, vlan_dev);
+
+	return 0;
+}
+
+static void br_vlan_link_state_change(struct net_device *dev,
+				      struct net_bridge *br)
+{
+	struct br_vlan_link_state_walk_data data = {
+		.br = br
+	};
+
+	rcu_read_lock();
+	netdev_walk_all_upper_dev_rcu(dev, br_vlan_link_state_change_fn,
+				      &data);
+	rcu_read_unlock();
+}
+
 /* Must be protected by RTNL. */
 static void nbp_vlan_set_vlan_dev_state(struct net_bridge_port *p, u16 vid)
 {
@@ -1411,12 +1446,21 @@ void br_vlan_bridge_event(struct net_device *dev, unsigned long event,
 			  void *ptr)
 {
 	struct netdev_notifier_changeupper_info *info;
+	struct net_bridge *br;
 
 	switch (event) {
 	case NETDEV_CHANGEUPPER:
 		info = ptr;
 		br_vlan_upper_change(dev, info->upper_dev, info->linking);
 		break;
+
+	case NETDEV_CHANGE:
+	case NETDEV_UP:
+		br = netdev_priv(dev);
+		if (!br_opt_get(br, BROPT_VLAN_BRIDGE_BINDING))
+			return;
+		br_vlan_link_state_change(dev, br);
+		break;
 	}
 }
 
-- 
2.11.0

Re: [PATCH net-next v3 5/5] bridge: update vlan dev link state for bridge netdev changes

[Nikolay Aleksandrov]

On 18/04/2019 20:35, Mike Manning wrote:
> If vlan bridge binding is enabled, then the link state of a vlan device
> that is an upper device of the bridge tracks the state of bridge ports
> that are members of that vlan. But this can only be done when the link
> state of the bridge is up. If it is down, then the link state of the
> vlan devices must also be down. This is to maintain existing behavior
> for when STP is enabled and there are no live ports, in which case the
> link state for the bridge and any vlan devices is down.
> 
> Signed-off-by: Mike Manning <mmanning@vyatta.att-mail.com>
> ---
>  net/bridge/br_vlan.c | 50 +++++++++++++++++++++++++++++++++++++++++++++++---
>  1 file changed, 47 insertions(+), 3 deletions(-)
> 

Acked-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>

Re: [PATCH net-next v3 0/5] net: support binding vlan dev link state to vlan member bridge ports

[Nikolay Aleksandrov]

On 18/04/2019 20:35, Mike Manning wrote:
> For vlan filtering on bridges, the bridge may also have vlan devices
> as upper devices. For switches, these are used to provide L3 packet
> processing for ports that are members of a given vlan.
> 
> While it is correct that the admin state for these vlan devices is
> either set directly for the device or inherited from the lower device,
> the link state is also transferred from the lower device. So this is
> always up if the bridge is in admin up state and there is at least one
> bridge port that is up, regardless of the vlan that the port is in.
> 
> The link state of the vlan device may need to track only the state of
> the subset of ports that are also members of the corresponding vlan,
> rather than that of all ports.
> 
> This series provides an optional vlan flag so that the link state of
> the vlan device is only up if there is at least one bridge port that is
> up AND is a member of the corresponding vlan.
> 
> v2:
>    - Address review comments from Nikolay Aleksandrov
>      in patches 3 & 4 and add patch 5 to address bridge link down due to STP
> v3:
>    - Address review comment from Nikolay Aleksandrov
>      in patch 4 so as to remove unnecessary inline #ifdef
> 
> Mike Manning (5):
>   vlan: support binding link state to vlan member bridge ports
>   vlan: do not transfer link state in vlan bridge binding mode
>   bridge: support binding vlan dev link state to vlan member bridge
>     ports
>   bridge: update vlan dev state when port added to or deleted from vlan
>   bridge: update vlan dev link state for bridge netdev changes
> 
>  include/uapi/linux/if_vlan.h |   9 +-
>  net/8021q/vlan.c             |  18 +++-
>  net/8021q/vlan_dev.c         |  22 +++--
>  net/8021q/vlan_netlink.c     |   3 +-
>  net/bridge/br.c              |  13 ++-
>  net/bridge/br_private.h      |  14 +++
>  net/bridge/br_vlan.c         | 214 +++++++++++++++++++++++++++++++++++++++++++
>  7 files changed, 272 insertions(+), 21 deletions(-)
> 

Hi Mike,
Thanks for doing all the changes, the set looks good. One tip for future reference
when someone is reviewing a set and sends their ack/review/signed-off please keep
it in the respective patches unless they have changed or need to be reviewed again.

Cheers,
 Nik

Re: [PATCH net-next v3 0/5] net: support binding vlan dev link state to vlan member bridge ports

[David Miller]

From: Mike Manning <mmanning@vyatta.att-mail.com>
Date: Thu, 18 Apr 2019 18:35:30 +0100

> For vlan filtering on bridges, the bridge may also have vlan devices
> as upper devices. For switches, these are used to provide L3 packet
> processing for ports that are members of a given vlan.
> 
> While it is correct that the admin state for these vlan devices is
> either set directly for the device or inherited from the lower device,
> the link state is also transferred from the lower device. So this is
> always up if the bridge is in admin up state and there is at least one
> bridge port that is up, regardless of the vlan that the port is in.
> 
> The link state of the vlan device may need to track only the state of
> the subset of ports that are also members of the corresponding vlan,
> rather than that of all ports.
> 
> This series provides an optional vlan flag so that the link state of
> the vlan device is only up if there is at least one bridge port that is
> up AND is a member of the corresponding vlan.
> 
> v2:
>    - Address review comments from Nikolay Aleksandrov
>      in patches 3 & 4 and add patch 5 to address bridge link down due to STP
> v3:
>    - Address review comment from Nikolay Aleksandrov
>      in patch 4 so as to remove unnecessary inline #ifdef

Series applied, thanks Mike.