[XFRM]: Export SAD info.
On a system with a lot of SAs, counting SAD entries chews useful
CPU time since you need to dump the whole SAD to user space;
i.e something like ip xfrm state ls | grep -i src | wc -l
I have seen taking literally minutes on a 40K SAs when the system
is swapping.
With this patch, some of the SAD info (that was already being tracked)
is exposed to user space. i.e you do:
ip xfrm state count
And you get the count; you can also pass -s to the command line and
get the hash info.
Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 743f07e..f3a61eb 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -421,6 +421,16 @@
}
EXPORT_SYMBOL(xfrm_state_flush);
+void xfrm_sad_getinfo(struct xfrm_sadinfo *si)
+{
+ spin_lock_bh(&xfrm_state_lock);
+ si->sadcnt = xfrm_state_num;
+ si->sadhcnt = xfrm_state_hmask;
+ si->sadhmcnt = xfrm_state_hashmax;
+ spin_unlock_bh(&xfrm_state_lock);
+}
+EXPORT_SYMBOL(xfrm_sad_getinfo);
+
static int
xfrm_init_tempsel(struct xfrm_state *x, struct flowi *fl,
struct xfrm_tmpl *tmpl,