netdev - Re: [PATCHv2 net-next 5/5] net: move the nat function to nf_nat

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Date:   Thu, 1 Dec 2022 11:26:39 -0500
From:   Xin Long <lucien.xin@...il.com>
To:     Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Cc:     network dev <netdev@...r.kernel.org>, dev@...nvswitch.org,
        ovs-dev@...nvswitch.org, davem@...emloft.net, kuba@...nel.org,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Pravin B Shelar <pshelar@....org>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Florian Westphal <fw@...len.de>,
        Davide Caratti <dcaratti@...hat.com>,
        Oz Shlomo <ozsh@...dia.com>, Paul Blakey <paulb@...dia.com>,
        Ilya Maximets <i.maximets@....org>,
        Eelco Chaudron <echaudro@...hat.com>,
        Aaron Conole <aconole@...hat.com>,
        netfilter-devel@...r.kernel.org
Subject: Re: [PATCHv2 net-next 5/5] net: move the nat function to nf_nat_ovs
 for ovs and tc

On Wed, Nov 23, 2022 at 1:52 PM Marcelo Ricardo Leitner
<marcelo.leitner@...il.com> wrote:
>
> On Tue, Nov 22, 2022 at 12:32:21PM -0500, Xin Long wrote:
> > --- a/net/netfilter/Makefile
> > +++ b/net/netfilter/Makefile
> > @@ -52,7 +52,7 @@ obj-$(CONFIG_NF_CONNTRACK_SANE) += nf_conntrack_sane.o
> >  obj-$(CONFIG_NF_CONNTRACK_SIP) += nf_conntrack_sip.o
> >  obj-$(CONFIG_NF_CONNTRACK_TFTP) += nf_conntrack_tftp.o
> >
> > -nf_nat-y     := nf_nat_core.o nf_nat_proto.o nf_nat_helper.o
> > +nf_nat-y     := nf_nat_core.o nf_nat_proto.o nf_nat_helper.o nf_nat_ovs.o
>
> Considering that the code in nf_nat_ovs is only used if ovs or act_ct
> are enabled, shouldn't it be using an invisible knob here that gets
> automatically selected by them? Pablo?
It's good to not build it if no place is using it.
Making nf_nat_ovs a module might be too much.
If it's okay to Netfilter devel, I will change to use "ifdef" in Makefile:

+ifdef CONFIG_OPENVSWITCH
+nf_nat-y += nf_nat_ovs.o
+else ifdef CONFIG_NET_ACT_CT
+nf_nat-y += nf_nat_ovs.o
+endif
+

Thanks.

>
> I think this is my last comment on this series. The rest LGTM.
>
> >
> >  obj-$(CONFIG_NF_LOG_SYSLOG) += nf_log_syslog.o
> >