netdev - Re: [PATCH 6/6] bridge: add vlan info to bridge setlink and dellink notification messages

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Date:	Mon, 29 Dec 2014 21:17:15 -0800
From:	roopa <roopa@...ulusnetworks.com>
To:	Scott Feldman <sfeldma@...il.com>
CC:	Netdev <netdev@...r.kernel.org>, shemminger@...tta.com,
	"vyasevic@...hat.com" <vyasevic@...hat.com>,
	Wilson Kok <wkok@...ulusnetworks.com>
Subject: Re: [PATCH 6/6] bridge: add vlan info to bridge setlink and dellink
 notification messages

On 12/29/14, 3:42 PM, Scott Feldman wrote:
> On Mon, Dec 29, 2014 at 1:05 PM,  <roopa@...ulusnetworks.com> wrote:
>> From: Roopa Prabhu <roopa@...ulusnetworks.com>
>>
>> vlan add/deletes are not notified to userspace today. This patch fixes it.
>> Notifications will contain vlans compressed into ranges whereever applicable.
> Why is this notification needed?  On VLAN add/del, the port driver
> will already get called if it implements ndo_vlan_rx_add_vid and
> ndo_vlan_rx_kill_vid.
This is strictly for userspace.

>    The port driver already gets the notification
> it needs to filter vlans.  User space can query for vlan port
> membership if it needs to know.

You mean request a dump ?. yes it can if it needs all the configured vlans.
But for notifications, we must at the least notify what changed with 
respect to vlans with RTM_SETLINK/DELLINK, no ?
>
>> Signed-off-by: Roopa Prabhu <roopa@...ulusnetworks.com>
>> ---
>>   net/bridge/br_netlink.c |    3 ++-
>>   net/core/rtnetlink.c    |    3 ++-
>>   2 files changed, 4 insertions(+), 2 deletions(-)
>>
>> diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
>> index 16bdd5a..cebfb03 100644
>> --- a/net/bridge/br_netlink.c
>> +++ b/net/bridge/br_netlink.c
>> @@ -303,7 +303,8 @@ void br_ifinfo_notify(int event, struct net_bridge_port *port)
>>          if (skb == NULL)
>>                  goto errout;
>>
>> -       err = br_fill_ifinfo(skb, port, 0, 0, event, 0, 0, port->dev);
>> +       err = br_fill_ifinfo(skb, port, 0, 0, event, 0,
>> +                            RTEXT_FILTER_BRVLAN_COMPRESSED, port->dev);
> This doesn't look right.  The skb wasn't allocated large enough to
> hold vlan info.  If this is working in your tests, you're getting
> lucky due to some skb padding.
>
> skb was allocated with br_nlmsg_size(), which doesn't include vlan info.
>
>>          if (err < 0) {
>>                  /* -EMSGSIZE implies BUG in br_nlmsg_size() */
>>                  WARN_ON(err == -EMSGSIZE);
>> diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
>> index d06107d..dad5fb6 100644
>> --- a/net/core/rtnetlink.c
>> +++ b/net/core/rtnetlink.c
>> @@ -2878,7 +2878,8 @@ static int rtnl_bridge_notify(struct net_device *dev, u16 flags)
>>
>>          if ((!flags || (flags & BRIDGE_FLAGS_MASTER)) &&
>>              br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
>> -               err = br_dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev, 0);
>> +               err = br_dev->netdev_ops->ndo_bridge_getlink(skb, 0, 0, dev,
>> +                                       RTEXT_FILTER_BRVLAN_COMPRESSED);
>>                  if (err < 0)
>>                          goto errout;
>>          }
>> --
>> 1.7.10.4
>>
>> --
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