On Tue, 11 Oct 2016 14:33:51 -0700
Roopa Prabhu <[email protected]> wrote:

> From: Roopa Prabhu <[email protected]>
> 
> This patch adds vlan and address to warning messages printed
> in the bridge fdb code for debuggability.
> 
> Signed-off-by: Roopa Prabhu <[email protected]>
> ---
>  net/bridge/br_fdb.c | 11 ++++++-----
>  1 file changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
> index 6b43c8c..1257a88 100644
> --- a/net/bridge/br_fdb.c
> +++ b/net/bridge/br_fdb.c
> @@ -536,8 +536,8 @@ static int fdb_insert(struct net_bridge *br, struct 
> net_bridge_port *source,
>               if (fdb->is_local)
>                       return 0;
>               br_warn(br, "adding interface %s with same address "
> -                    "as a received packet\n",
> -                    source ? source->dev->name : br->dev->name);
> +                    "as a received packet (addr:%pM, vlan:%d)\n",
> +                    source ? source->dev->name : br->dev->name, addr, vid);
>               fdb_delete(br, fdb);
>       }
>  
> @@ -583,9 +583,10 @@ void br_fdb_update(struct net_bridge *br, struct 
> net_bridge_port *source,
>               /* attempt to update an entry for a local interface */
>               if (unlikely(fdb->is_local)) {
>                       if (net_ratelimit())
> -                             br_warn(br, "received packet on %s with "
> -                                     "own address as source address\n",
> -                                     source->dev->name);
> +                             br_warn(br, "received packet on %s with own "
> +                                     "address as source address "
> +                                     "(addr:%pM, vlan:%d)\n",
> +                                     source->dev->name, addr, vid);
>               } else {

Isn't vlan unsigned here so print with %u
Also it would be good to make string format on one line to allow for easy 
search of source.
                                br_warn(br,
                                        "received packet on %s with own address 
%pM vlan %u",
                                        source->dev->name, addr, vid);

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