diff options
| author | Eric Dumazet <edumazet@google.com> | 2024-02-13 06:32:42 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2024-02-14 11:20:13 +0000 |
| commit | 6a2968ee1ee2cc6fce30f6f5724442b34b1483b3 (patch) | |
| tree | 0a41642980c841e40bbcd58ce7b4b1612362aeac /net/core | |
| parent | 328771deab16fcac55763309bb59e28b1c050853 (diff) | |
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>
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/link_watch.c | 9 | ||||
| -rw-r--r-- | net/core/rtnetlink.c | 22 |
2 files changed, 17 insertions, 14 deletions
diff --git a/net/core/link_watch.c b/net/core/link_watch.c index 1b93e054c9a3..8ec35194bfcb 100644 --- a/net/core/link_watch.c +++ b/net/core/link_watch.c @@ -33,7 +33,7 @@ static DECLARE_DELAYED_WORK(linkwatch_work, linkwatch_event); static LIST_HEAD(lweventlist); static DEFINE_SPINLOCK(lweventlist_lock); -static unsigned char default_operstate(const struct net_device *dev) +static unsigned int default_operstate(const struct net_device *dev) { if (netif_testing(dev)) return IF_OPER_TESTING; @@ -62,16 +62,13 @@ static unsigned char default_operstate(const struct net_device *dev) return IF_OPER_UP; } - static void rfc2863_policy(struct net_device *dev) { - unsigned char operstate = default_operstate(dev); + unsigned int operstate = default_operstate(dev); if (operstate == READ_ONCE(dev->operstate)) return; - write_lock(&dev_base_lock); - switch(dev->link_mode) { case IF_LINK_MODE_TESTING: if (operstate == IF_OPER_UP) @@ -88,8 +85,6 @@ static void rfc2863_policy(struct net_device *dev) } WRITE_ONCE(dev->operstate, operstate); - - write_unlock(&dev_base_lock); } diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index 43d92de8601c..e484ba44f23b 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -842,9 +842,22 @@ int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id, } EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo); +void netdev_set_operstate(struct net_device *dev, int newstate) +{ + unsigned int old = READ_ONCE(dev->operstate); + + do { + if (old == newstate) + return; + } while (!try_cmpxchg(&dev->operstate, &old, newstate)); + + netdev_state_change(dev); +} +EXPORT_SYMBOL(netdev_set_operstate); + static void set_operstate(struct net_device *dev, unsigned char transition) { - unsigned char operstate = dev->operstate; + unsigned char operstate = READ_ONCE(dev->operstate); switch (transition) { case IF_OPER_UP: @@ -866,12 +879,7 @@ static void set_operstate(struct net_device *dev, unsigned char transition) break; } - if (READ_ONCE(dev->operstate) != operstate) { - write_lock(&dev_base_lock); - WRITE_ONCE(dev->operstate, operstate); - write_unlock(&dev_base_lock); - netdev_state_change(dev); - } + netdev_set_operstate(dev, operstate); } static unsigned int rtnl_dev_get_flags(const struct net_device *dev) |