netdev - Re: [PATCH net-next v2 2/5] vlan: do not transfer link state in vlan bridge binding mode

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Date:   Thu, 18 Apr 2019 14:25:41 +0300
From:   Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:     Mike Manning <mmanning@...tta.att-mail.com>,
        netdev@...r.kernel.org, roopa@...ulusnetworks.com
Subject: Re: [PATCH net-next v2 2/5] vlan: do not transfer link state in vlan
 bridge binding mode

On 17/04/2019 21:16, Mike Manning wrote:
> In vlan bridge binding mode, the link state is no longer transferred
> from the lower device. Instead it is set by the bridge module according
> to the state of bridge ports that are members of the vlan.
> 
> Signed-off-by: Mike Manning <mmanning@...tta.att-mail.com>
> ---
>  net/8021q/vlan.c     | 18 ++++++++++++++----
>  net/8021q/vlan_dev.c | 19 ++++++++++++-------
>  2 files changed, 26 insertions(+), 11 deletions(-)
> 
> diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
> index dc4411165e43..1f99678751df 100644
> --- a/net/8021q/vlan.c
> +++ b/net/8021q/vlan.c
> @@ -75,6 +75,14 @@ static int vlan_group_prealloc_vid(struct vlan_group *vg,
>  	return 0;
>  }
>  
> +static void vlan_stacked_transfer_operstate(const struct net_device *rootdev,
> +					    struct net_device *dev,
> +					    struct vlan_dev_priv *vlan)
> +{
> +	if (!(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
> +		netif_stacked_transfer_operstate(rootdev, dev);
> +}
> +
>  void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
>  {
>  	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
> @@ -180,7 +188,7 @@ int register_vlan_dev(struct net_device *dev, struct netlink_ext_ack *extack)
>  	/* Account for reference in struct vlan_dev_priv */
>  	dev_hold(real_dev);
>  
> -	netif_stacked_transfer_operstate(real_dev, dev);
> +	vlan_stacked_transfer_operstate(real_dev, dev, vlan);
>  	linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
>  
>  	/* So, got the sucker initialized, now lets place
> @@ -399,7 +407,8 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event,
>  	case NETDEV_CHANGE:
>  		/* Propagate real device state to vlan devices */
>  		vlan_group_for_each_dev(grp, i, vlandev)
> -			netif_stacked_transfer_operstate(dev, vlandev);
> +			vlan_stacked_transfer_operstate(dev, vlandev,
> +							vlan_dev_priv(vlandev));
>  		break;
>  
>  	case NETDEV_CHANGEADDR:
> @@ -446,7 +455,8 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event,
>  		dev_close_many(&close_list, false);
>  
>  		list_for_each_entry_safe(vlandev, tmp, &close_list, close_list) {
> -			netif_stacked_transfer_operstate(dev, vlandev);
> +			vlan_stacked_transfer_operstate(dev, vlandev,
> +							vlan_dev_priv(vlandev));
>  			list_del_init(&vlandev->close_list);
>  		}
>  		list_del(&close_list);
> @@ -463,7 +473,7 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event,
>  			if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
>  				dev_change_flags(vlandev, flgs | IFF_UP,
>  						 extack);
> -			netif_stacked_transfer_operstate(dev, vlandev);
> +			vlan_stacked_transfer_operstate(dev, vlandev, vlan);
>  		}
>  		break;
>  
> diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
> index ed996b500b10..f044ae56a313 100644
> --- a/net/8021q/vlan_dev.c
> +++ b/net/8021q/vlan_dev.c
> @@ -297,7 +297,8 @@ static int vlan_dev_open(struct net_device *dev)
>  	if (vlan->flags & VLAN_FLAG_MVRP)
>  		vlan_mvrp_request_join(dev);
>  
> -	if (netif_carrier_ok(real_dev))
> +	if (netif_carrier_ok(real_dev) &&
> +	    !(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
>  		netif_carrier_on(dev);
>  	return 0;
>  
> @@ -327,7 +328,8 @@ static int vlan_dev_stop(struct net_device *dev)
>  	if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
>  		dev_uc_del(real_dev, dev->dev_addr);
>  
> -	netif_carrier_off(dev);
> +	if (!(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
> +		netif_carrier_off(dev);
>  	return 0;
>  }
>  
> @@ -551,7 +553,8 @@ static const struct net_device_ops vlan_netdev_ops;
>  
>  static int vlan_dev_init(struct net_device *dev)
>  {
> -	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
> +	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
> +	struct net_device *real_dev = vlan->real_dev;
>  
>  	netif_carrier_off(dev);
>  
> @@ -562,6 +565,9 @@ static int vlan_dev_init(struct net_device *dev)
>  					  (1<<__LINK_STATE_DORMANT))) |
>  		      (1<<__LINK_STATE_PRESENT);
>  
> +	if (vlan->flags & VLAN_FLAG_BRIDGE_BINDING)
> +		dev->state |= (1 << __LINK_STATE_NOCARRIER);
> +
>  	dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG |
>  			   NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE |
>  			   NETIF_F_GSO_ENCAP_ALL |
> @@ -592,8 +598,7 @@ static int vlan_dev_init(struct net_device *dev)
>  #endif
>  
>  	dev->needed_headroom = real_dev->needed_headroom;
> -	if (vlan_hw_offload_capable(real_dev->features,
> -				    vlan_dev_priv(dev)->vlan_proto)) {
> +	if (vlan_hw_offload_capable(real_dev->features, vlan->vlan_proto)) {
>  		dev->header_ops      = &vlan_passthru_header_ops;
>  		dev->hard_header_len = real_dev->hard_header_len;
>  	} else {
> @@ -607,8 +612,8 @@ static int vlan_dev_init(struct net_device *dev)
>  
>  	vlan_dev_set_lockdep_class(dev, vlan_dev_get_lock_subclass(dev));
>  
> -	vlan_dev_priv(dev)->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
> -	if (!vlan_dev_priv(dev)->vlan_pcpu_stats)
> +	vlan->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
> +	if (!vlan->vlan_pcpu_stats)
>  		return -ENOMEM;
>  
>  	return 0;
> 

Acked-by: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>