netdev - Re: [PATCH net-next v2 1/7] net: flow_offload: provision conntrack info in ct

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Date:   Tue, 17 Jan 2023 12:09:24 -0300
From:   Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:     Vlad Buslov <vladbu@...dia.com>
Cc:     davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        pablo@...filter.org, netdev@...r.kernel.org,
        netfilter-devel@...r.kernel.org, jhs@...atatu.com,
        xiyou.wangcong@...il.com, jiri@...nulli.us, ozsh@...dia.com,
        simon.horman@...igine.com
Subject: Re: [PATCH net-next v2 1/7] net: flow_offload: provision conntrack
 info in ct_metadata

On Tue, Jan 17, 2023 at 12:04:32PM -0300, Marcelo Ricardo Leitner wrote:
> On Fri, Jan 13, 2023 at 05:55:42PM +0100, Vlad Buslov wrote:
> ...
> >  struct flow_match {
> > @@ -288,6 +289,7 @@ struct flow_action_entry {
> >  		} ct;
> >  		struct {
> >  			unsigned long cookie;
> > +			enum ip_conntrack_info ctinfo;
> >  			u32 mark;
> >  			u32 labels[4];
> >  			bool orig_dir;
> > diff --git a/net/sched/act_ct.c b/net/sched/act_ct.c
> > index 0ca2bb8ed026..515577f913a3 100644
> > --- a/net/sched/act_ct.c
> > +++ b/net/sched/act_ct.c
> > @@ -187,6 +187,7 @@ static void tcf_ct_flow_table_add_action_meta(struct nf_conn *ct,
> >  	/* aligns with the CT reference on the SKB nf_ct_set */
> >  	entry->ct_metadata.cookie = (unsigned long)ct | ctinfo;
>                                                    ^^^^^^^^^^^

Hmm. Thought that just came up and still need to dig into, but wanted
to share/ask already. Would it be a problem to update the cookie later
on then, to reflect the new ctinfo?

> 
> >  	entry->ct_metadata.orig_dir = dir == IP_CT_DIR_ORIGINAL;
> > +	entry->ct_metadata.ctinfo = ctinfo;
> 
> tcf_ct_flow_table_restore_skb() is doing:
>         enum ip_conntrack_info ctinfo = cookie & NFCT_INFOMASK;
> 
> Not sure if it really needs this duplication then.
> 
> >  
> >  	act_ct_labels = entry->ct_metadata.labels;
> >  	ct_labels = nf_ct_labels_find(ct);
> > -- 
> > 2.38.1
> >