linux-kernel - Re: [PATCH 11/14] networking: Update to register_net_sysctl

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Message-ID: <20230728070822.nfxb36kvvd7dio2a@localhost>
Date:   Fri, 28 Jul 2023 09:08:22 +0200
From:   Joel Granados <j.granados@...sung.com>
To:     Luis Chamberlain <mcgrof@...nel.org>
CC:     "David S. Miller" <davem@...emloft.net>,
        David Ahern <dsahern@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Alexander Aring <alex.aring@...il.com>,
        Stefan Schmidt <stefan@...enfreihafen.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Matthieu Baerts <matthieu.baerts@...sares.net>,
        Mat Martineau <martineau@...nel.org>,
        Santosh Shilimkar <santosh.shilimkar@...cle.com>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Xin Long <lucien.xin@...il.com>,
        Karsten Graul <kgraul@...ux.ibm.com>,
        Wenjia Zhang <wenjia@...ux.ibm.com>,
        Jan Karcher <jaka@...ux.ibm.com>, <willy@...radead.org>,
        <keescook@...omium.org>, <josh@...htriplett.org>,
        "D. Wythe" <alibuda@...ux.alibaba.com>,
        Tony Lu <tonylu@...ux.alibaba.com>,
        Wen Gu <guwen@...ux.alibaba.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-wpan@...r.kernel.org>,
        <mptcp@...ts.linux.dev>, <linux-rdma@...r.kernel.org>,
        <rds-devel@....oracle.com>, <linux-sctp@...r.kernel.org>,
        <linux-s390@...r.kernel.org>
Subject: Re: [PATCH 11/14] networking: Update to register_net_sysctl_sz

On Wed, Jul 26, 2023 at 11:05:24AM -0700, Luis Chamberlain wrote:
> On Wed, Jul 26, 2023 at 04:06:31PM +0200, Joel Granados wrote:
> > This is part of the effort to remove the sentinel (last empty) element
> > from the ctl_table arrays. We update to the new function and pass it the
> > array size. Care is taken to mirror the NULL assignments with a size of
> > zero (for the unprivileged users). An additional size function was added
> > to the following files in order to calculate the size of an array that
> > is defined in another file:
> >     include/net/ipv6.h
> >     net/ipv6/icmp.c
> >     net/ipv6/route.c
> >     net/ipv6/sysctl_net_ipv6.c
> > 
> 
> Same here as with the other patches, the "why" and size impact should go here.
> I'll skip mentioning that in the other patches.
> 
> > diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c
> > index bf6e81d56263..5bad14b3c71e 100644
> > --- a/net/mpls/af_mpls.c
> > +++ b/net/mpls/af_mpls.c
> > @@ -1396,6 +1396,40 @@ static const struct ctl_table mpls_dev_table[] = {
> >  	{ }
> >  };
> >  
> > +static int mpls_platform_labels(struct ctl_table *table, int write,
> > +				void *buffer, size_t *lenp, loff_t *ppos);
> > +#define MPLS_NS_SYSCTL_OFFSET(field)		\
> > +	(&((struct net *)0)->field)
> > +
> > +static const struct ctl_table mpls_table[] = {
> > +	{
> > +		.procname	= "platform_labels",
> > +		.data		= NULL,
> > +		.maxlen		= sizeof(int),
> > +		.mode		= 0644,
> > +		.proc_handler	= mpls_platform_labels,
> > +	},
> > +	{
> > +		.procname	= "ip_ttl_propagate",
> > +		.data		= MPLS_NS_SYSCTL_OFFSET(mpls.ip_ttl_propagate),
> > +		.maxlen		= sizeof(int),
> > +		.mode		= 0644,
> > +		.proc_handler	= proc_dointvec_minmax,
> > +		.extra1		= SYSCTL_ZERO,
> > +		.extra2		= SYSCTL_ONE,
> > +	},
> > +	{
> > +		.procname	= "default_ttl",
> > +		.data		= MPLS_NS_SYSCTL_OFFSET(mpls.default_ttl),
> > +		.maxlen		= sizeof(int),
> > +		.mode		= 0644,
> > +		.proc_handler	= proc_dointvec_minmax,
> > +		.extra1		= SYSCTL_ONE,
> > +		.extra2		= &ttl_max,
> > +	},
> > +	{ }
> > +};
> 
> Unless we hear otherwise from networking folks, I think this move alone
> should probably go as a separate patch with no functional changes to
> make the changes easier to review / bisect.
On further inspection, I have dropped this part of the patch as there is
no real reason to move the mpls_table up the file. I'll comment this in
the new cover letter
> 
>   Luis

-- 

Joel Granados

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