Re: [PATCH net-next v2] net: psample: fix flag being set in wrong skb

[Adrián Moreno]

On Wed, Jul 10, 2024 at 03:30:14PM GMT, Antoine Tenart wrote:
> Hi Adrián,
>
> Quoting Adrian Moreno (2024-07-10 11:07:42)
> > A typo makes PSAMPLE_ATTR_SAMPLE_RATE netlink flag be added to the wrong
> > sk_buff.
> >
> > Fix the error and make the input sk_buff pointer "const" so that it
> > doesn't happen again.
> >
> > Also modify OVS psample test to verify the flag is properly emitted.
>
> I don't see that part; although it can be sent as a follow-up and not
> part of the fix.

Yep. Sorry I was planning to add it to the fix but thought it was better
off as a follow-up. I should have removed this comment.

>
> Thanks,
> Antoine
>
> > Fixes: 7b1b2b60c63f ("net: psample: allow using rate as probability")
> > Signed-off-by: Adrian Moreno <amorenoz@xxxxxxxxxx>
> > ---
> >  include/net/psample.h | 8 +++++---
> >  net/psample/psample.c | 7 ++++---
> >  2 files changed, 9 insertions(+), 6 deletions(-)
> >
> > diff --git a/include/net/psample.h b/include/net/psample.h
> > index c52e9ebd88dd..5071b5fc2b59 100644
> > --- a/include/net/psample.h
> > +++ b/include/net/psample.h
> > @@ -38,13 +38,15 @@ struct sk_buff;
> >
> >  #if IS_ENABLED(CONFIG_PSAMPLE)
> >
> > -void psample_sample_packet(struct psample_group *group, struct sk_buff *skb,
> > -                          u32 sample_rate, const struct psample_metadata *md);
> > +void psample_sample_packet(struct psample_group *group,
> > +                          const struct sk_buff *skb, u32 sample_rate,
> > +                          const struct psample_metadata *md);
> >
> >  #else
> >
> >  static inline void psample_sample_packet(struct psample_group *group,
> > -                                        struct sk_buff *skb, u32 sample_rate,
> > +                                        const struct sk_buff *skb,
> > +                                        u32 sample_rate,
> >                                          const struct psample_metadata *md)
> >  {
> >  }
> > diff --git a/net/psample/psample.c b/net/psample/psample.c
> > index f48b5b9cd409..a0ddae8a65f9 100644
> > --- a/net/psample/psample.c
> > +++ b/net/psample/psample.c
> > @@ -360,8 +360,9 @@ static int psample_tunnel_meta_len(struct ip_tunnel_info *tun_info)
> >  }
> >  #endif
> >
> > -void psample_sample_packet(struct psample_group *group, struct sk_buff *skb,
> > -                          u32 sample_rate, const struct psample_metadata *md)
> > +void psample_sample_packet(struct psample_group *group,
> > +                          const struct sk_buff *skb, u32 sample_rate,
> > +                          const struct psample_metadata *md)
> >  {
> >         ktime_t tstamp = ktime_get_real();
> >         int out_ifindex = md->out_ifindex;
> > @@ -498,7 +499,7 @@ void psample_sample_packet(struct psample_group *group, struct sk_buff *skb,
> >                 goto error;
> >
> >         if (md->rate_as_probability)
> > -               nla_put_flag(skb, PSAMPLE_ATTR_SAMPLE_PROBABILITY);
> > +               nla_put_flag(nl_skb, PSAMPLE_ATTR_SAMPLE_PROBABILITY);
> >
> >         genlmsg_end(nl_skb, data);
> >         genlmsg_multicast_netns(&psample_nl_family, group->net, nl_skb, 0,
> > --
> > 2.45.2
> >
> >
>