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Commit 45493d47 authored by Paolo Abeni's avatar Paolo Abeni Committed by David S. Miller
Browse files

bridge: notify enslaved devices of headroom changes 



On bridge needed_headroom changes, the enslaved devices are
notified via the ndo_set_rx_headroom method

Signed-off-by: default avatarPaolo Abeni <pabeni@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 871b642a

net/bridge/br_if.c

+35 −2
Original line number Diff line number Diff line
@@ -223,6 +223,31 @@ static void destroy_nbp_rcu(struct rcu_head *head) 
	destroy_nbp(p);

}



static unsigned get_max_headroom(struct net_bridge *br)

{

	unsigned max_headroom = 0;

	struct net_bridge_port *p;



	list_for_each_entry(p, &br->port_list, list) {

		unsigned dev_headroom = netdev_get_fwd_headroom(p->dev);



		if (dev_headroom > max_headroom)

			max_headroom = dev_headroom;

	}



	return max_headroom;

}



static void update_headroom(struct net_bridge *br, int new_hr)

{

	struct net_bridge_port *p;



	list_for_each_entry(p, &br->port_list, list)

		netdev_set_rx_headroom(p->dev, new_hr);



	br->dev->needed_headroom = new_hr;

}



/* Delete port(interface) from bridge is done in two steps.

 * via RCU. First step, marks device as down. That deletes

 * all the timers and stops new packets from flowing through.
@@ -248,6 +273,9 @@ static void del_nbp(struct net_bridge_port *p) 
	br_ifinfo_notify(RTM_DELLINK, p);



	list_del_rcu(&p->list);

	if (netdev_get_fwd_headroom(dev) == br->dev->needed_headroom)

		update_headroom(br, get_max_headroom(br));

	netdev_reset_rx_headroom(dev);



	nbp_vlan_flush(p);

	br_fdb_delete_by_port(br, p, 0, 1);
@@ -438,6 +466,7 @@ int br_add_if(struct net_bridge *br, struct net_device *dev) 
{

	struct net_bridge_port *p;

	int err = 0;

	unsigned br_hr, dev_hr;

	bool changed_addr;



	/* Don't allow bridging non-ethernet like devices, or DSA-enabled
@@ -505,8 +534,12 @@ int br_add_if(struct net_bridge *br, struct net_device *dev) 


	netdev_update_features(br->dev);



	if (br->dev->needed_headroom < dev->needed_headroom)

		br->dev->needed_headroom = dev->needed_headroom;

	br_hr = br->dev->needed_headroom;

	dev_hr = netdev_get_fwd_headroom(dev);

	if (br_hr < dev_hr)

		update_headroom(br, dev_hr);

	else

		netdev_set_rx_headroom(dev, br_hr);



	if (br_fdb_insert(br, p, dev->dev_addr, 0))

		netdev_err(dev, "failed insert local address bridge forwarding table\n");