Re: [PATCH net-next v2] openvswitch: Make 100 percents packets sampled when sampling rate is 1.
From: Pravin Shelar <hidden>
Date: 2015-08-04 22:00:28
On Mon, Aug 3, 2015 at 9:07 PM, Wenyu Zhang [off-list ref] wrote:
When sampling rate is 1, the sampling probability is UINT32_MAX. The packet should be sampled even the prandom_u32() generate the number of UINT32_MAX. And none packet need be sampled when the probability is 0. Signed-off-by: Wenyu Zhang <redacted>
Patch looks good, I have following minor comments.
quoted hunk
--- net/openvswitch/actions.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c index cf04c2f..c81bcf5 100644 --- a/net/openvswitch/actions.c +++ b/net/openvswitch/actions.c@@ -669,9 +669,11 @@ static int sample(struct datapath *dp, struct sk_buff *skb, for (a = nla_data(attr), rem = nla_len(attr); rem > 0; a = nla_next(a, &rem)) { + uint32_t probability; switch (nla_type(a)) {
There should be blank line after variable definitions.
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;I got following warning on checkpatch.pl ./scripts/checkpatch.pl 0001-openvswitch-Make-100-percents-packets-sampled-when-s.patch CHECK: Prefer kernel type 'u32' over 'uint32_t' #24: FILE: net/openvswitch/actions.c:672: + uint32_t probability; total: 0 errors, 0 warnings, 1 checks, 12 lines checked _______________________________________________ dev mailing list dev@openvswitch.org http://openvswitch.org/mailman/listinfo/dev