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[XFRM]: Export SAD info.

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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>
This commit is contained in:
Jamal Hadi Salim
2007-04-26 00:10:29 -07:00
committed by David S. Miller
parent 98486fa2f4
commit 28d8909bc7
4 changed files with 99 additions and 0 deletions
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10
net/xfrm/xfrm_state.c
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@@ -421,6 +421,16 @@ restart:
}
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,