netdev - Re: [PATCH net-next V3 4/4] net/sched: Introduce act_tunnel

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Date:   Thu, 25 Aug 2016 19:52:56 +0300
From:   Shmulik Ladkani <shmulik.ladkani@...il.com>
To:     Hadar Hen Zion <hadarh@...lanox.com>
Cc:     "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Jiri Pirko <jiri@...lanox.com>, Jiri Benc <jbenc@...hat.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Tom Herbert <tom@...bertland.com>,
        Or Gerlitz <ogerlitz@...lanox.com>,
        Amir Vadai <amirva@...lanox.com>, Amir Vadai <amir@...ai.me>
Subject: Re: [PATCH net-next V3 4/4] net/sched: Introduce act_tunnel_key

Hi,

On Thu, 25 Aug 2016 19:13:47 +0300 Hadar Hen Zion <hadarh@...lanox.com> wrote:
> +static int tunnel_key_act(struct sk_buff *skb, const struct tc_action *a,
> +			  struct tcf_result *res)
> +{
> +	struct tcf_tunnel_key *t = to_tunnel_key(a);
> +	int action;
> +
> +	spin_lock(&t->tcf_lock);
> +	tcf_lastuse_update(&t->tcf_tm);
> +	bstats_update(&t->tcf_bstats, skb);
> +	action = t->tcf_action;
> +
> +	switch (t->tcft_action) {
> +	case TCA_TUNNEL_KEY_ACT_RELEASE:
> +		skb_dst_set_noref(skb, NULL);
> +		break;
> +	case TCA_TUNNEL_KEY_ACT_SET:
> +		skb_dst_set_noref(skb, &t->tcft_enc_metadata->dst);
> +		break;

Two additional questions:
 - No need to perform a 'skb_dst_drop(skb)' prior the dst set calls?
 - Why there's no need to take a reference on tcft_enc_metadata->dst?

Besides that,

Reviewed-by: Shmulik Ladkani <shmulik.ladkani@...il.com>

Thanks!