xfrm: state: do not acquire lock in get_mtu helpers

Once flow cache gets removed the mtu initialisation happens for every skb
that gets an xfrm attached, so this lock starts to show up in perf.

It is not obvious why this lock is required -- the caller holds
reference on the state struct, type->destructor is only called from the
state gc worker (all state structs on gc list must have refcount 0).

xfrm_init_state already has been called (else private data accessed
by type->get_mtu() would not be set up).

So just remove the lock -- the race on the state (DEAD?) doesn't
matter (could change right after dropping the lock too).

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index c5cf4d611aab902d901e367ac558fc8b0a9bf32d..6b3366fef019cabc974520c02202008b9acc1e8f 100644 (file)
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -2000,16 +2000,13 @@ EXPORT_SYMBOL(xfrm_state_delete_tunnel);
 
 int xfrm_state_mtu(struct xfrm_state *x, int mtu)
 {
-       int res;
+       const struct xfrm_type *type = READ_ONCE(x->type);
 
-       spin_lock_bh(&x->lock);
        if (x->km.state == XFRM_STATE_VALID &&
-           x->type && x->type->get_mtu)
-               res = x->type->get_mtu(x, mtu);
-       else
-               res = mtu - x->props.header_len;
-       spin_unlock_bh(&x->lock);
-       return res;
+           type && type->get_mtu)
+               return type->get_mtu(x, mtu);
+
+       return mtu - x->props.header_len;
 }
 
 int __xfrm_init_state(struct xfrm_state *x, bool init_replay)