Patchwork [10/14] bridge: Add the ability to pvid

A user may designate a certain vlan as PVID.  This means that
any ingress frame that does not contain a vlan tag is assigned to
this vlan and any forwarding decisions are made with this vlan in mind.

Signed-off-by: Vlad Yasevich <vyasevic@redhat.com>
---
 include/uapi/linux/if_bridge.h |    1 +
 net/bridge/br_if.c             |   77 +++++++++++++++++++++++++++++++++++++--
 net/bridge/br_netlink.c        |    9 +++--
 net/bridge/br_private.h        |    5 ++-
 4 files changed, 82 insertions(+), 10 deletions(-)

On 01/09/2013 12:17 PM, Vlad Yasevich wrote:
> A user may designate a certain vlan as PVID.  This means that
> any ingress frame that does not contain a vlan tag is assigned to
> this vlan and any forwarding decisions are made with this vlan in mind.
>
> Signed-off-by: Vlad Yasevich <vyasevic@redhat.com>

Sorry..  this one is a left-over that snuck in....  Disregard this 
patch.  The proper one is in the series already.

-vlad

> ---
>   include/uapi/linux/if_bridge.h |    1 +
>   net/bridge/br_if.c             |   77 +++++++++++++++++++++++++++++++++++++--
>   net/bridge/br_netlink.c        |    9 +++--
>   net/bridge/br_private.h        |    5 ++-
>   4 files changed, 82 insertions(+), 10 deletions(-)
>
> diff --git a/include/uapi/linux/if_bridge.h b/include/uapi/linux/if_bridge.h
> index 1bc9216..e5ea4cb 100644
> --- a/include/uapi/linux/if_bridge.h
> +++ b/include/uapi/linux/if_bridge.h
> @@ -120,6 +120,7 @@ enum {
>   #define IFLA_BRIDGE_MAX (__IFLA_BRIDGE_MAX - 1)
>
>   #define BRIDGE_VLAN_INFO_MASTER	(1<<0)	/* Operate on Bridge device as well */
> +#define BRIDGE_VLAN_INFO_PVID	(1<<1)	/* VLAN is PVID, ingress untagged */
>
>   struct bridge_vlan_info {
>   	u16 flags;
> diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
> index 7377113..0698581 100644
> --- a/net/bridge/br_if.c
> +++ b/net/bridge/br_if.c
> @@ -182,6 +182,56 @@ static void br_vlan_flush(struct net_bridge *br)
>   	}
>   }
>
> +static int nbp_vlan_add_pvid(struct net_port_vlans *v,
> +			     struct net_bridge_vlan *vlan)
> +{
> +	struct net_bridge_vlan *pvlan = rtnl_dereference(v->pvlan);
> +
> +	if (pvlan == vlan)
> +		return 0;
> +	else if (pvlan) {
> +		/* PVID is already set.  Drop the ref
> +		 * to the old one since we'll be replace it.
> +		 */
> +		br_vlan_put(pvlan);
> +	} else if (v->port_idx) {
> +		struct net_device *dev = vlans_to_port(v)->dev;
> +
> +		/* Add vid 0 to filter if filter is available. */
> +		if (!vlan_hw_buggy(dev)) {
> +			int err = vlan_vid_add_hw(dev, 0);
> +			if (err)
> +				return err;
> +		}
> +	}
> +
> +	br_vlan_hold(vlan);
> +	rcu_assign_pointer(v->pvlan, vlan);
> +	return 0;
> +}
> +
> +static void nbp_vlan_delete_pvid(struct net_port_vlans *v,
> +				 struct net_bridge_vlan *vlan)
> +{
> +	struct net_bridge_vlan *pvlan = rtnl_dereference(v->pvlan);
> +
> +	if (pvlan != vlan)
> +		return;
> +
> +	if (v->port_idx &&
> +	    vlan_vid_del_hw(vlans_to_port(v)->dev, 0)) {
> +		pr_warn("failed to kill vid 0 for device %s\n",
> +			vlans_to_port(v)->dev->name);
> +	}
> +
> +	/* If this VLAN is currently functioning as pvlan, clear it.
> +	 * It's safe to drop the refcount, since the vlan is still held
> +	 * by the pve->vlan pointer.
> +	 */
> +	br_vlan_put(vlan);
> +	rcu_assign_pointer(v->pvlan, NULL);
> +}
> +
>   struct net_port_vlan *nbp_vlan_find(const struct net_port_vlans *v, u16 vid)
>   {
>   	struct net_port_vlan *pve;
> @@ -198,9 +248,9 @@ struct net_port_vlan *nbp_vlan_find(const struct net_port_vlans *v, u16 vid)
>   }
>
>   /* Must be protected by RTNL */
> -int nbp_vlan_add(struct net_port_vlans *v, u16 vid)
> +int nbp_vlan_add(struct net_port_vlans *v, u16 vid, u16 flags)
>   {
> -	struct net_port_vlan *pve;
> +	struct net_port_vlan *pve = NULL;
>   	struct net_bridge_vlan *vlan;
>   	struct net_bridge *br = vlans_to_bridge(v);
>   	struct net_bridge_port *p = vlans_to_port(v);
> @@ -247,26 +297,45 @@ int nbp_vlan_add(struct net_port_vlans *v, u16 vid)
>   	set_bit(v->port_idx, vlan->port_bitmap);
>
>   	list_add_tail_rcu(&pve->list, &v->vlan_list);
> +
> +	if (flags & BRIDGE_VLAN_INFO_PVID) {
> +		err = nbp_vlan_add_pvid(v, vlan);
> +		if (err)
> +			goto del_vlan;
> +	}
> +
>   	return 0;
>
>   clean_up:
>   	kfree(pve);
>   	br_vlan_del(vlan);
>   	return err;
> +del_vlan:
> +	nbp_vlan_delete(v, vid, flags);
> +	return err;
>   }
>
>   /* Must be protected by RTNL */
> -int nbp_vlan_delete(struct net_port_vlans *v, u16 vid)
> +int nbp_vlan_delete(struct net_port_vlans *v, u16 vid, u16 flags)
>   {
>   	struct net_port_vlan *pve;
>   	struct net_bridge_vlan *vlan;
> +	struct net_bridge *br;
>
>   	ASSERT_RTNL();
>
> +	if (v->port_idx)
> +		br = vlans_to_port(v)->br;
> +	else
> +		br = vlans_to_bridge(v);
> +
>   	pve = nbp_vlan_find(v, vid);
>   	if (!pve)
>   		return -ENOENT;
>
> +	if (flags & BRIDGE_VLAN_INFO_PVID)
> +		nbp_vlan_delete_pvid(v, pve->vlan);
> +
>   	if (v->port_idx) {
>   		/* A valid port index means this is a port.
>   		 * Remove VLAN from the port device filter if it is supported.
> @@ -301,7 +370,7 @@ static void nbp_vlan_flush(struct net_port_vlans *vlans)
>   	ASSERT_RTNL();
>
>   	list_for_each_entry_safe(pve, tmp, &vlans->vlan_list, list)
> -		nbp_vlan_delete(vlans, pve->vid);
> +		nbp_vlan_delete(vlans, pve->vid, BRIDGE_VLAN_INFO_PVID);
>   }
>
>   static void release_nbp(struct kobject *kobj)
> diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
> index f365ac4..08692d1 100644
> --- a/net/bridge/br_netlink.c
> +++ b/net/bridge/br_netlink.c
> @@ -200,19 +200,20 @@ static int br_afspec(struct net_bridge *br,
>
>   		switch (cmd) {
>   		case RTM_SETLINK:
> -			err = nbp_vlan_add(v, vinfo->vid);
> +			err = nbp_vlan_add(v, vinfo->vid, vinfo->flags);
>   			if (err)
>   				break;
>   			if (p && (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)) {
>   				err = nbp_vlan_add(&p->br->vlan_info,
> -						   vinfo->vid);
> +						   vinfo->vid, vinfo->flags);
>   			}
>   			break;
>
>   		case RTM_DELLINK:
> -			nbp_vlan_delete(v, vinfo->vid);
> +			nbp_vlan_delete(v, vinfo->vid, vinfo->flags);
>   			if (p && (vinfo->flags & BRIDGE_VLAN_INFO_MASTER))
> -				nbp_vlan_delete(&p->br->vlan_info, vinfo->vid);
> +				nbp_vlan_delete(&p->br->vlan_info, vinfo->vid,
> +						vinfo->flags);
>
>   			break;
>   		}
> diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
> index 4c507a4..d39701a 100644
> --- a/net/bridge/br_private.h
> +++ b/net/bridge/br_private.h
> @@ -89,6 +89,7 @@ struct net_port_vlan {
>   struct net_port_vlans {
>   	u16				port_idx;
>   	struct list_head		vlan_list;
> +	struct net_bridge_vlan __rcu	*pvlan;
>   };
>
>   struct net_bridge_fdb_entry
> @@ -472,8 +473,8 @@ extern int br_min_mtu(const struct net_bridge *br);
>   extern netdev_features_t br_features_recompute(struct net_bridge *br,
>   	netdev_features_t features);
>   extern struct net_bridge_vlan *br_vlan_find(struct net_bridge *br, u16 vid);
> -extern int nbp_vlan_add(struct net_port_vlans *v, u16 vid);
> -extern int nbp_vlan_delete(struct net_port_vlans *v, u16 vid);
> +extern int nbp_vlan_add(struct net_port_vlans *v, u16 vid, u16 flags);
> +extern int nbp_vlan_delete(struct net_port_vlans *v, u16 vid, u16 flags);
>   extern struct net_port_vlan *nbp_vlan_find(const struct net_port_vlans *v,
>   					   u16 vid);
>
>

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