netdev - Re: [PATCH net v4] net: bridge: move default pvid init/deinit to NETDEV

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Date:   Fri, 2 Aug 2019 18:41:14 +0300
From:   Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     netdev@...r.kernel.org, roopa@...ulusnetworks.com,
        davem@...emloft.net, bridge@...ts.linux-foundation.org,
        michael-dev <michael-dev@...i-braun.de>
Subject: Re: [PATCH net v4] net: bridge: move default pvid init/deinit to
 NETDEV_REGISTER/UNREGISTER

On 02/08/2019 18:35, Stephen Hemminger wrote:
> On Fri,  2 Aug 2019 13:57:36 +0300
> Nikolay Aleksandrov <nikolay@...ulusnetworks.com> wrote:
> 
>> +int br_vlan_bridge_event(struct net_device *dev, unsigned long event, void *ptr)
>>  {
>>  	struct netdev_notifier_changeupper_info *info;
>> -	struct net_bridge *br;
>> +	struct net_bridge *br = netdev_priv(dev);
>> +	bool changed;
>> +	int ret = 0;
>>  
>>  	switch (event) {
>> +	case NETDEV_REGISTER:
>> +		ret = br_vlan_add(br, br->default_pvid,
>> +				  BRIDGE_VLAN_INFO_PVID |
>> +				  BRIDGE_VLAN_INFO_UNTAGGED |
>> +				  BRIDGE_VLAN_INFO_BRENTRY, &changed, NULL);
>> +		break;
> 
> Looks good.
> 
> As minor optimization br_vlan_add could ignore changed pointer if NULL.
> This would save places where you don't care.
> 
> 
> Something like:
> diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
> index 021cc9f66804..bacd3543b215 100644
> --- a/net/bridge/br_vlan.c
> +++ b/net/bridge/br_vlan.c
> @@ -626,10 +626,11 @@ static int br_vlan_add_existing(struct net_bridge *br,
>  		refcount_inc(&vlan->refcnt);
>  		vlan->flags |= BRIDGE_VLAN_INFO_BRENTRY;
>  		vg->num_vlans++;
> -		*changed = true;
> +		if (changed)
> +			*changed = true;
>  	}
>  
> -	if (__vlan_add_flags(vlan, flags))
> +	if (__vlan_add_flags(vlan, flags) && changed)
>  		*changed = true;
>  
>  	return 0;
> @@ -653,7 +654,8 @@ int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, bool *changed,
>  
>  	ASSERT_RTNL();
>  
> -	*changed = false;
> +	if (changed)
> +		*changed = false;
>  	vg = br_vlan_group(br);
>  	vlan = br_vlan_find(vg, vid);
>  	if (vlan)
> @@ -679,7 +681,7 @@ int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, bool *changed,
>  	if (ret) {
>  		free_percpu(vlan->stats);
>  		kfree(vlan);
> -	} else {
> +	} else if (changed) {
>  		*changed = true;
>  	}
>  
> 

sure, this is ok for net-next