netdev - Re: [PATCH RFC net-next 2/3] Expose tc block ports to the datapath

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Message-ID: <ZNyREolbSoaMz8VA@vergenet.net>
Date: Wed, 16 Aug 2023 11:04:18 +0200
From: Simon Horman <horms@...nel.org>
To: Jamal Hadi Salim <jhs@...atatu.com>
Cc: jiri@...nulli.us, xiyou.wangcong@...il.com, netdev@...r.kernel.org,
	vladbu@...dia.com, mleitner@...hat.com,
	Victor Nogueira <victor@...atatu.com>,
	Pedro Tammela <pctammela@...atatu.com>
Subject: Re: [PATCH RFC net-next 2/3] Expose tc block ports to the datapath

On Tue, Aug 15, 2023 at 12:25:29PM -0400, Jamal Hadi Salim wrote:
> The datapath can now find the block of the port in which the packet arrived at.
> It can then use it for various activities.
> 
> In the next patch we show a simple action that multicast to all ports except for
> the port in which the packet arrived on.
> 
> Co-developed-by: Victor Nogueira <victor@...atatu.com>
> Signed-off-by: Victor Nogueira <victor@...atatu.com>
> Co-developed-by: Pedro Tammela <pctammela@...atatu.com>
> Signed-off-by: Pedro Tammela <pctammela@...atatu.com>
> Signed-off-by: Jamal Hadi Salim <jhs@...atatu.com>

...

> diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
> index a976792ef02f..be4555714519 100644
> --- a/net/sched/cls_api.c
> +++ b/net/sched/cls_api.c

...

> @@ -1737,9 +1738,12 @@ int tcf_classify(struct sk_buff *skb,
>  		 const struct tcf_proto *tp,
>  		 struct tcf_result *res, bool compat_mode)
>  {
> +	struct qdisc_skb_cb *qdisc_cb = qdisc_skb_cb(skb);

Hi Jamal,

Does the line above belong inside the condition immediately below?
It seems potentially unused otherwise.

>  #if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
>  	u32 last_executed_chain = 0;
>  
> +	qdisc_cb->block_index = block->index;
> +
>  	return __tcf_classify(skb, tp, tp, res, compat_mode, NULL, 0,
>  			      &last_executed_chain);
>  #else
> -- 
> 2.34.1
> 
>