net: add netdev_set_operstate() helper
dev_base_lock is going away, add netdev_set_operstate() helper so that hsr does not have to know core internals. Remove dev_base_lock acquisition from rfc2863_policy() v3: use an "unsigned int" for dev->operstate, so that try_cmpxchg() can work on all arches. ( https://lore.kernel.org/oe-kbuild-all/202402081918.OLyGaea3-lkp@intel.com/ ) Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -2258,7 +2258,7 @@ struct net_device {
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const struct tlsdev_ops *tlsdev_ops;
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#endif
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unsigned char operstate;
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unsigned int operstate;
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unsigned char link_mode;
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unsigned char if_port;
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@ -172,4 +172,6 @@ rtnl_notify_needed(const struct net *net, u16 nlflags, u32 group)
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return (nlflags & NLM_F_ECHO) || rtnl_has_listeners(net, group);
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}
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void netdev_set_operstate(struct net_device *dev, int newstate);
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#endif /* __LINUX_RTNETLINK_H */
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@ -33,7 +33,7 @@ static DECLARE_DELAYED_WORK(linkwatch_work, linkwatch_event);
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static LIST_HEAD(lweventlist);
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static DEFINE_SPINLOCK(lweventlist_lock);
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static unsigned char default_operstate(const struct net_device *dev)
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static unsigned int default_operstate(const struct net_device *dev)
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{
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if (netif_testing(dev))
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return IF_OPER_TESTING;
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@ -62,16 +62,13 @@ static unsigned char default_operstate(const struct net_device *dev)
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return IF_OPER_UP;
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}
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static void rfc2863_policy(struct net_device *dev)
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{
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unsigned char operstate = default_operstate(dev);
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unsigned int operstate = default_operstate(dev);
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if (operstate == READ_ONCE(dev->operstate))
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return;
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write_lock(&dev_base_lock);
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switch(dev->link_mode) {
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case IF_LINK_MODE_TESTING:
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if (operstate == IF_OPER_UP)
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@ -88,8 +85,6 @@ static void rfc2863_policy(struct net_device *dev)
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}
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WRITE_ONCE(dev->operstate, operstate);
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write_unlock(&dev_base_lock);
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}
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@ -842,9 +842,22 @@ int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
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}
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EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
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void netdev_set_operstate(struct net_device *dev, int newstate)
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{
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unsigned int old = READ_ONCE(dev->operstate);
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do {
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if (old == newstate)
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return;
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} while (!try_cmpxchg(&dev->operstate, &old, newstate));
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netdev_state_change(dev);
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}
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EXPORT_SYMBOL(netdev_set_operstate);
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static void set_operstate(struct net_device *dev, unsigned char transition)
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{
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unsigned char operstate = dev->operstate;
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unsigned char operstate = READ_ONCE(dev->operstate);
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switch (transition) {
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case IF_OPER_UP:
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@ -866,12 +879,7 @@ static void set_operstate(struct net_device *dev, unsigned char transition)
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break;
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}
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if (READ_ONCE(dev->operstate) != operstate) {
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write_lock(&dev_base_lock);
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WRITE_ONCE(dev->operstate, operstate);
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write_unlock(&dev_base_lock);
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netdev_state_change(dev);
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}
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netdev_set_operstate(dev, operstate);
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}
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static unsigned int rtnl_dev_get_flags(const struct net_device *dev)
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@ -28,29 +28,19 @@ static bool is_slave_up(struct net_device *dev)
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return dev && is_admin_up(dev) && netif_oper_up(dev);
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}
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static void __hsr_set_operstate(struct net_device *dev, int transition)
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{
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write_lock(&dev_base_lock);
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if (READ_ONCE(dev->operstate) != transition) {
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WRITE_ONCE(dev->operstate, transition);
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write_unlock(&dev_base_lock);
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netdev_state_change(dev);
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} else {
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write_unlock(&dev_base_lock);
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}
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}
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static void hsr_set_operstate(struct hsr_port *master, bool has_carrier)
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{
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if (!is_admin_up(master->dev)) {
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__hsr_set_operstate(master->dev, IF_OPER_DOWN);
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struct net_device *dev = master->dev;
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if (!is_admin_up(dev)) {
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netdev_set_operstate(dev, IF_OPER_DOWN);
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return;
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}
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if (has_carrier)
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__hsr_set_operstate(master->dev, IF_OPER_UP);
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netdev_set_operstate(dev, IF_OPER_UP);
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else
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__hsr_set_operstate(master->dev, IF_OPER_LOWERLAYERDOWN);
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netdev_set_operstate(dev, IF_OPER_LOWERLAYERDOWN);
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}
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static bool hsr_check_carrier(struct hsr_port *master)
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