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Commit 6bd64ac0 authored by David S. Miller's avatar David S. Miller
Browse files

Merge branch 'stacked_netdevice_locking' 



Vlad Yasevich says:

====================
Fix lockdep issues with stacked devices

Recent commit dc8eaaa0
    vlan: Fix lockdep warning when vlan dev handle notification

attempted to solve lockdep issues with vlans where multiple
vlans were stacked.  However, the code does not work correctly
when the vlan stack is interspersed with other devices in between
the vlans.  Additionally, similar lockdep issues show up with other
devices.

This series provides a generic way to solve these issue for any
devices that can be stacked.  It also addresses the concern for
vlan and macvlan devices.  I am not sure whether it makes sense
to do so for other types like team, vxlan, and bond.

Thanks
-vlad

Since v2:
  - Remove rcu variants from patch1, since that function is called
    only under rtnl.
  - Fix whitespace problems reported by checkpatch

Since v1:
  - Fixed up a goofed-up rebase.
    * is_vlan_dev() should be bool and that change belongs in patch3.
    * patch4 should not have any vlan changes in it.
====================

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parents 29e98242 c674ac30

drivers/net/macvlan.c

+10 −2
Original line number Diff line number Diff line
@@ -517,6 +517,11 @@ static struct lock_class_key macvlan_netdev_addr_lock_key; 
#define MACVLAN_STATE_MASK \

	((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))



static int macvlan_get_nest_level(struct net_device *dev)

{

	return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;

}



static void macvlan_set_lockdep_class_one(struct net_device *dev,

					  struct netdev_queue *txq,

					  void *_unused)
@@ -527,8 +532,9 @@ static void macvlan_set_lockdep_class_one(struct net_device *dev, 


static void macvlan_set_lockdep_class(struct net_device *dev)

{

	lockdep_set_class(&dev->addr_list_lock,

			  &macvlan_netdev_addr_lock_key);

	lockdep_set_class_and_subclass(&dev->addr_list_lock,

				       &macvlan_netdev_addr_lock_key,

				       macvlan_get_nest_level(dev));

	netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);

}
@@ -723,6 +729,7 @@ static const struct net_device_ops macvlan_netdev_ops = { 
	.ndo_fdb_add		= macvlan_fdb_add,

	.ndo_fdb_del		= macvlan_fdb_del,

	.ndo_fdb_dump		= ndo_dflt_fdb_dump,

	.ndo_get_lock_subclass  = macvlan_get_nest_level,

};



void macvlan_common_setup(struct net_device *dev)
@@ -851,6 +858,7 @@ int macvlan_common_newlink(struct net *src_net, struct net_device *dev, 
	vlan->dev      = dev;

	vlan->port     = port;

	vlan->set_features = MACVLAN_FEATURES;

	vlan->nest_level = dev_get_nest_level(lowerdev, netif_is_macvlan) + 1;



	vlan->mode     = MACVLAN_MODE_VEPA;

	if (data && data[IFLA_MACVLAN_MODE])

include/linux/if_macvlan.h

+1 −0
Original line number Diff line number Diff line
@@ -56,6 +56,7 @@ struct macvlan_dev { 
	int			numqueues;

	netdev_features_t	tap_features;

	int			minor;

	int			nest_level;

};



static inline void macvlan_count_rx(const struct macvlan_dev *vlan,

include/linux/if_vlan.h

+2 −1
Original line number Diff line number Diff line
@@ -73,7 +73,7 @@ static inline struct vlan_ethhdr *vlan_eth_hdr(const struct sk_buff *skb) 
/* found in socket.c */

extern void vlan_ioctl_set(int (*hook)(struct net *, void __user *));



static inline int is_vlan_dev(struct net_device *dev)

static inline bool is_vlan_dev(struct net_device *dev)

{

        return dev->priv_flags & IFF_802_1Q_VLAN;

}
@@ -159,6 +159,7 @@ struct vlan_dev_priv { 
#ifdef CONFIG_NET_POLL_CONTROLLER

	struct netpoll				*netpoll;

#endif

	unsigned int				nest_level;

};



static inline struct vlan_dev_priv *vlan_dev_priv(const struct net_device *dev)

include/linux/netdevice.h

+17 −1
Original line number Diff line number Diff line
@@ -1144,6 +1144,7 @@ struct net_device_ops { 
	netdev_tx_t		(*ndo_dfwd_start_xmit) (struct sk_buff *skb,

							struct net_device *dev,

							void *priv);

	int			(*ndo_get_lock_subclass)(struct net_device *dev);

};



/**
@@ -2950,7 +2951,12 @@ static inline void netif_addr_lock(struct net_device *dev) 


static inline void netif_addr_lock_nested(struct net_device *dev)

{

	spin_lock_nested(&dev->addr_list_lock, SINGLE_DEPTH_NESTING);

	int subclass = SINGLE_DEPTH_NESTING;



	if (dev->netdev_ops->ndo_get_lock_subclass)

		subclass = dev->netdev_ops->ndo_get_lock_subclass(dev);



	spin_lock_nested(&dev->addr_list_lock, subclass);

}



static inline void netif_addr_lock_bh(struct net_device *dev)
@@ -3077,6 +3083,14 @@ void *netdev_lower_get_next_private_rcu(struct net_device *dev, 
	     priv; \

	     priv = netdev_lower_get_next_private_rcu(dev, &(iter)))



void *netdev_lower_get_next(struct net_device *dev,

				struct list_head **iter);

#define netdev_for_each_lower_dev(dev, ldev, iter) \

	for (iter = &(dev)->adj_list.lower, \

	     ldev = netdev_lower_get_next(dev, &(iter)); \

	     ldev; \

	     ldev = netdev_lower_get_next(dev, &(iter)))



void *netdev_adjacent_get_private(struct list_head *adj_list);

void *netdev_lower_get_first_private_rcu(struct net_device *dev);

struct net_device *netdev_master_upper_dev_get(struct net_device *dev);
@@ -3092,6 +3106,8 @@ void netdev_upper_dev_unlink(struct net_device *dev, 
void netdev_adjacent_rename_links(struct net_device *dev, char *oldname);

void *netdev_lower_dev_get_private(struct net_device *dev,

				   struct net_device *lower_dev);

int dev_get_nest_level(struct net_device *dev,

		       bool (*type_check)(struct net_device *dev));

int skb_checksum_help(struct sk_buff *skb);

struct sk_buff *__skb_gso_segment(struct sk_buff *skb,

				  netdev_features_t features, bool tx_path);

net/8021q/vlan.c

+1 −0
Original line number Diff line number Diff line
@@ -169,6 +169,7 @@ int register_vlan_dev(struct net_device *dev) 
	if (err < 0)

		goto out_uninit_mvrp;



	vlan->nest_level = dev_get_nest_level(real_dev, is_vlan_dev) + 1;

	err = register_netdevice(dev);

	if (err < 0)

		goto out_uninit_mvrp;