netdev - Re: [Bridge] [PATCH v7 net-next 01/12] bridge: Add vlan filtering infrastructure

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Date:	Thu, 31 Jan 2013 16:54:54 -0500
From:	Vlad Yasevich <vyasevic@...hat.com>
To:	Simon Barber <simon@...erduper.net>
CC:	Michał Mirosław <mirqus@...il.com>,
	netdev@...r.kernel.org, shemminger@...tta.com,
	bridge@...ts.linux-foundation.org, davem@...emloft.net,
	shmulik.ladkani@...il.com
Subject: Re: [Bridge] [PATCH v7 net-next 01/12] bridge: Add vlan filtering
 infrastructure

On 01/31/2013 04:46 PM, Simon Barber wrote:
> Great - I look forward to seeing this functionality in the kernel - this
> will be very useful. Are you releasing brctl patches too?

ioctl interface is deprecated so there will be no brctl patches.  These 
patches use a netlink interface and I will post patches to the iproute2 
bridge tool to configure this.

-vlad

>
> Simon
>
> On 01/31/2013 12:34 PM, Vlad Yasevich wrote:
>> On 01/31/2013 03:33 PM, Simon Barber wrote:
>>> I wrote a similar patch a few years ago:
>>>
>>> https://lists.linux-foundation.org/pipermail/bridge/2006-September/005046.html
>>>
>>>
>>>
>>>
>>> This patch also added the possibility to define a native vlan for each
>>> port and for the bridge port itself - is there any interest in this
>>> feature as well as the filtering?
>>>
>>
>> See patch 5 and 6 and the series :)
>>
>> -vlad
>>
>>> Simon
>>>
>>>
>>> On 01/31/2013 11:57 AM, Michał Mirosław wrote:
>>>> 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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