diff options
| author | Kuniyuki Iwashima <kuniyu@amazon.com> | 2024-10-04 15:10:29 -0700 |
|---|---|---|
| committer | Paolo Abeni <pabeni@redhat.com> | 2024-10-08 15:16:59 +0200 |
| commit | 76aed95319da25d6884dff01d5f0149e4b542f96 (patch) | |
| tree | a4abd91a746cb82930cf34c1b588cb12e8613d4e /include/net | |
| parent | ec763c234d7f60c5bce0fa2611ba79f5be1af76b (diff) | |
rtnetlink: Add per-netns RTNL.
The goal is to break RTNL down into per-netns mutex.
This patch adds per-netns mutex and its helper functions, rtnl_net_lock()
and rtnl_net_unlock().
rtnl_net_lock() acquires the global RTNL and per-netns RTNL mutex, and
rtnl_net_unlock() releases them.
We will replace 800+ rtnl_lock() with rtnl_net_lock() and finally removes
rtnl_lock() in rtnl_net_lock().
When we need to nest per-netns RTNL mutex, we will use __rtnl_net_lock(),
and its locking order is defined by rtnl_net_lock_cmp_fn() as follows:
1. init_net is first
2. netns address ascending order
Note that the conversion will be done under CONFIG_DEBUG_NET_SMALL_RTNL
with LOCKDEP so that we can carefully add the extra mutex without slowing
down RTNL operations during conversion.
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'include/net')
| -rw-r--r-- | include/net/net_namespace.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h index e67b483cc8bb..873c0f9fdac6 100644 --- a/include/net/net_namespace.h +++ b/include/net/net_namespace.h @@ -188,6 +188,10 @@ struct net { #if IS_ENABLED(CONFIG_SMC) struct netns_smc smc; #endif +#ifdef CONFIG_DEBUG_NET_SMALL_RTNL + /* Move to a better place when the config guard is removed. */ + struct mutex rtnl_mutex; +#endif } __randomize_layout; #include <linux/seq_file_net.h> |