On Mon, Aug 3, 2015 at 9:07 PM, Wenyu Zhang <wen...@vmware.com> 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 <wen...@vmware.com>
Patch looks good, I have following minor comments.
> ---
> 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
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