linux-kernel - Re: [PATCH net-next v8 02/10] net: sched: act

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Message-ID: <ZoPhLnlQJyoznJuM@localhost.localdomain>
Date: Tue, 2 Jul 2024 13:14:54 +0200
From: Michal Kubiak <michal.kubiak@...el.com>
To: Adrian Moreno <amorenoz@...hat.com>
CC: <netdev@...r.kernel.org>, <aconole@...hat.com>, <echaudro@...hat.com>,
	<horms@...nel.org>, <i.maximets@....org>, <dev@...nvswitch.org>, Ido Schimmel
	<idosch@...dia.com>, Jamal Hadi Salim <jhs@...atatu.com>, 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 v8 02/10] net: sched: act_sample: add action
 cookie to sample

On Tue, Jul 02, 2024 at 11:53:19AM +0200, Adrian Moreno wrote:
> If the action has a user_cookie, pass it along to the sample so it can
> be easily identified.
> 
> Reviewed-by: Aaron Conole <aconole@...hat.com>
> Acked-by: Eelco Chaudron <echaudro@...hat.com>
> Reviewed-by: Ido Schimmel <idosch@...dia.com>
> Signed-off-by: Adrian Moreno <amorenoz@...hat.com>
> ---
>  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..2ceb4d141b71 100644
> --- a/net/sched/act_sample.c
> +++ b/net/sched/act_sample.c
> @@ -167,7 +167,9 @@ TC_INDIRECT_SCOPE int tcf_sample_act(struct sk_buff *skb,
>  {
>  	struct tcf_sample *s = to_sample(a);
>  	struct psample_group *psample_group;
> +	u8 cookie_data[TC_COOKIE_MAX_SIZE];
>  	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);
>  
> -- 
> 2.45.2
> 
> 

Reviewed-by: Michal Kubiak <michal.kubiak@...el.com>