linux-kernel - Re: [RFC] net: hsr: Provide RedBox support

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Date: Fri, 1 Mar 2024 10:37:05 +0100
From: Lukasz Majewski <lukma@...x.de>
To: Andrew Lunn <andrew@...n.ch>
Cc: Stephen Hemminger <stephen@...workplumber.org>, Oleksij Rempel
 <o.rempel@...gutronix.de>, Eric Dumazet <edumazet@...gle.com>, Florian
 Fainelli <f.fainelli@...il.com>, Vladimir Oltean <olteanv@...il.com>,
 "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
 netdev@...r.kernel.org, Tristram.Ha@...rochip.com, Sebastian Andrzej
 Siewior <bigeasy@...utronix.de>, Paolo Abeni <pabeni@...hat.com>, Ravi
 Gunasekaran <r-gunasekaran@...com>, Simon Horman <horms@...nel.org>,
 Wojciech Drewek <wojciech.drewek@...el.com>, Nikita Zhandarovich
 <n.zhandarovich@...tech.ru>, Murali Karicheri <m-karicheri2@...com>, Dan
 Carpenter <dan.carpenter@...aro.org>, Ziyang Xuan
 <william.xuanziyang@...wei.com>, Kristian Overskeid <koverskeid@...il.com>,
 Matthieu Baerts <matttbe@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [RFC] net: hsr: Provide RedBox support

Hi Andrew,

> On Thu, Feb 29, 2024 at 10:25:57AM +0100, Lukasz Majewski wrote:
> > Hi Andrew,
> >   
> > > On Wed, Feb 28, 2024 at 08:31:15AM -0800, Stephen Hemminger
> > > wrote:  
> > > > On Wed, 28 Feb 2024 16:07:35 +0100
> > > > Lukasz Majewski <lukma@...x.de> wrote:
> > > >     
> > > > >  
> > > > > +/* hsr_proxy_node_table_show - Formats and prints proxy
> > > > > node_table entries */ +static int
> > > > > +hsr_proxy_node_table_show(struct seq_file *sfp, void *data)
> > > > > +{
> > > > > +	struct hsr_priv *priv = (struct hsr_priv
> > > > > *)sfp->private;
> > > > > +	struct hsr_node *node;
> > > > > +
> > > > > +	seq_printf(sfp, "Proxy Node Table entries for HSR
> > > > > device\n");
> > > > > +	seq_puts(sfp, "MAC-Address-SAN,        time_in\n");
> > > > > +	rcu_read_lock();
> > > > > +	list_for_each_entry_rcu(node, &priv->proxy_node_db,
> > > > > mac_list) {
> > > > > +		seq_printf(sfp, "%pM ",
> > > > > &node->macaddress_A[0]);
> > > > > +		seq_printf(sfp, "%10lx\n",
> > > > > node->time_in[HSR_PT_INTERLINK]);
> > > > > +	}
> > > > > +	rcu_read_unlock();
> > > > > +	return 0;
> > > > > +}
> > > > > +
> > > > >  DEFINE_SHOW_ATTRIBUTE(hsr_node_table);
> > > > > +DEFINE_SHOW_ATTRIBUTE(hsr_proxy_node_table);    
> > > > 
> > > > NAK
> > > > Do not abuse sysfs to be a debug proc style output.    
> > > 
> > > This is actually debugfs, not sysfs.
> > > 
> > > However, i agree, we want information like this exported via
> > > netlink as the primary interface to the end user. debugfs is not
> > > suitable for that.  
> > 
> > Am I correct, that recommended approach would be to:
> > 
> > 1. Modify iproute2 to support for example:
> > 
> > ip addr show dev hsr1 nodes {proxy} ?  
> 
> Something like that. iproute2 is more than the ip command. There is
> also bridge, dcb, vdpa, etc. So you need to decide where it fits best.
> Maybe as part of bridge? Or even a command of its own.

IMHO, 'bridge' is not the best place for hsr output, as 'NodeTable' can
(and should) be provided for non-redbox communication.

For now the ip looks like the best place.

> 
> > 2. Shall the currently exported:
> > 
> > /sys/kernel/debug/hsr/hsrX/node_table be left as it is (for legacy
> > usage) or shall it be removed and replaced with netlink and
> > iproute2 ?  
> 
> There is no legacy usage. debugfs is unstable, it is not KAPI. Nothing
> is expected to use it, because it could disappear at any time, its
> format can change, etc. For a long time, debugfs was not liked in
> networking, because it was abused and tools built on top of it, often
> vendor tools. We much prefer well defined interfaces such as
> netlink. But it seems like things are becoming a little bit more
> loose.

Ok. Thanks for the explanation.

> If you have a well defined netlink API making debugfs
> pointless, you can probably keep the debugfs code :-) But you can also
> remove it.

I would prefer to keep the code.

> 
> 	   Andrew


Best regards,

Lukasz Majewski

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