When sampling rate is 1, the sampling probability is UINT32_MAX. The packet
should be sampled even the prandom32() generate the number of UINT32_MAX.
And no packet need be sampled when the probability is 0.
Signed-off-by: Wenyu Zhang <wen...@vmware.com>
---
datapath/actions.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/datapath/actions.c b/datapath/actions.c
index 4941ca0..456f56b 100644
--- a/datapath/actions.c
+++ b/datapath/actions.c
@@ -675,12 +675,14 @@ static int sample(struct datapath *dp, struct sk_buff
*skb,
const struct nlattr *acts_list = NULL;
const struct nlattr *a;
int rem;
+ uint32_t probability;
for (a = nla_data(attr), rem = nla_len(attr); rem > 0;
a = nla_next(a, &rem)) {
switch (nla_type(a)) {
case OVS_SAMPLE_ATTR_PROBABILITY:
- if (prandom_u32() >= nla_get_u32(a))
+ probability = nla_get_u32(a);
+ if (!probability || (prandom_u32() > probability))
return 0;
break;
--
1.7.9.5
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