linux-kernel - Re: [PATCH net-next 5/8] net: sched: act

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Date: Thu, 25 Apr 2024 17:43:52 -0400
From: Jamal Hadi Salim <jhs@...atatu.com>
To: Adrian Moreno <amorenoz@...hat.com>
Cc: netdev@...r.kernel.org, aconole@...hat.com, echaudro@...hat.com, 
	horms@...nel.org, i.maximets@....org, Cong Wang <xiyou.wangcong@...il.com>, 
	Jiri Pirko <jiri@...nulli.us>, "David S. Miller" <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 5/8] net: sched: act_sample: add action cookie to sample

On Wed, Apr 24, 2024 at 9:54 AM Adrian Moreno <amorenoz@...hat.com> wrote:
>
> If the action has a user_cookie, pass it along to the sample so it can
> be easily identified.
>
> Signed-off-by: Adrian Moreno <amorenoz@...hat.com>
Reviewed-by: Jamal Hadi Salim <jhs@...atatu.com>

cheers,
jamal

> ---
>  net/sched/act_sample.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
>
> diff --git a/net/sched/act_sample.c b/net/sched/act_sample.c
> index a69b53d54039..5c3f86ec964a 100644
> --- a/net/sched/act_sample.c
> +++ b/net/sched/act_sample.c
> @@ -165,9 +165,11 @@ TC_INDIRECT_SCOPE int tcf_sample_act(struct sk_buff *skb,
>                                      const struct tc_action *a,
>                                      struct tcf_result *res)
>  {
> +       u8 cookie_data[TC_COOKIE_MAX_SIZE] = {};
>         struct tcf_sample *s = to_sample(a);
>         struct psample_group *psample_group;
>         struct psample_metadata md = {};
> +       struct tc_cookie *user_cookie;
>         int retval;
>
>         tcf_lastuse_update(&s->tcf_tm);
> @@ -189,6 +191,16 @@ TC_INDIRECT_SCOPE int tcf_sample_act(struct sk_buff *skb,
>                 if (skb_at_tc_ingress(skb) && tcf_sample_dev_ok_push(skb->dev))
>                         skb_push(skb, skb->mac_len);
>
> +               rcu_read_lock();
> +               user_cookie = rcu_dereference(a->user_cookie);
> +               if (user_cookie) {
> +                       memcpy(cookie_data, user_cookie->data,
> +                              user_cookie->len);
> +                       md.user_cookie = cookie_data;
> +                       md.user_cookie_len = user_cookie->len;
> +               }
> +               rcu_read_unlock();
> +
>                 md.trunc_size = s->truncate ? s->trunc_size : skb->len;
>                 psample_sample_packet(psample_group, skb, s->rate, &md);
>
> --
> 2.44.0
>