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Date:	Thu, 31 Jan 2013 20:57:01 +0100
From:	Michał Mirosław <mirqus@...il.com>
To:	Vlad Yasevich <vyasevic@...hat.com>
Cc:	shemminger@...tta.com, bridge@...ts.linux-foundation.org,
	davem@...emloft.net, netdev@...r.kernel.org,
	shmulik.ladkani@...il.com
Subject: Re: [PATCH v7 net-next 01/12] bridge: Add vlan filtering infrastructure

2013/1/31 Vlad Yasevich <vyasevic@...hat.com>:
> Adds an optional infrustructure component to bridge that would allow
> native vlan filtering in the bridge.  Each bridge port (as well
> as the bridge device) now get a VLAN bitmap.  Each bit in the bitmap
> is associated with a vlan id.  This way if the bit corresponding to
> the vid is set in the bitmap that the packet with vid is allowed to
> enter and exit the port.
>
> Write access the bitmap is protected by RTNL and read access
> protected by RCU.
[...]
> +static int __vlan_del(struct net_port_vlans *v, u16 vid)
> +{
> +       unsigned long first_bit;
> +       unsigned long last_bit;
> +
> +       if (!test_bit(vid, v->vlan_bitmap))
> +               return -EINVAL;
> +
> +       /* Check to see if any other vlans are in this table.  If this
> +        * is the last vlan, delete the whole structure.  If this is not the
> +        * last vlan, just clear the bit.
> +        */
> +       first_bit = find_first_bit(v->vlan_bitmap, BR_VLAN_BITMAP_LEN);
> +       last_bit = find_last_bit(v->vlan_bitmap, BR_VLAN_BITMAP_LEN);
> +
> +       if (v->port_idx && vid) {
> +               struct net_device *dev = vlans_to_port(v)->dev;
> +
> +               if (dev->features & NETIF_F_HW_VLAN_FILTER)
> +                       dev->netdev_ops->ndo_vlan_rx_kill_vid(dev, vid);
> +       }
> +
> +       clear_bit(vid, v->vlan_bitmap);
> +       if (first_bit == last_bit) {

if (bitmap_empty(v->vlan_bitmap, BR_VLAN_BITMAP_LEN))

> +               if (v->port_idx) {
> +                       struct net_bridge_port *p = vlans_to_port(v);
> +                       rcu_assign_pointer(p->vlan_info, NULL);
> +               } else {
> +                       struct net_bridge *br = vlans_to_bridge(v);
> +                       rcu_assign_pointer(br->vlan_info, NULL);
> +               }

You seem to use vlans_to_port/vlans_to_bridge only to get at
vlan_info. Maybe that could be abstracted to a single interface, or
even change v->parent to be a 'net_port_vlans **'?

Best Regards,
Michał Mirosław
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