netdev - Re: [PATCH net-next v4 06/12] net: dsa: rzn1-a5psw: add Renesas RZ/N1 advanced 5 port switch driver

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Date:   Tue, 10 May 2022 10:34:58 +0200
From:   Clément Léger <clement.leger@...tlin.com>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Herve Codina <herve.codina@...tlin.com>,
        Miquèl Raynal <miquel.raynal@...tlin.com>,
        Milan Stevanovic <milan.stevanovic@...com>,
        Jimmy Lalande <jimmy.lalande@...com>,
        Pascal Eberhard <pascal.eberhard@...com>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org, netdev@...r.kernel.org,
        Jean-Pierre Geslin <jean-pierre.geslin@....se.com>,
        Phil Edworthy <phil.edworthy@...esas.com>
Subject: Re: [PATCH net-next v4 06/12] net: dsa: rzn1-a5psw: add Renesas
 RZ/N1 advanced 5 port switch driver

Le Mon, 9 May 2022 19:08:13 +0300,
Vladimir Oltean <olteanv@...il.com> a écrit :

> On Mon, May 09, 2022 at 03:18:54PM +0200, Clément Léger wrote:
> > Add Renesas RZ/N1 advanced 5 port switch driver. This switch
> > handles 5 ports including 1 CPU management port. A MDIO bus is also
> > exposed by this switch and allows to communicate with PHYs
> > connected to the ports. Each switch port (except for the CPU
> > management ports) is connected to the MII converter.
> > 
> > This driver includes basic bridging support, more support will be
> > added later (vlan, etc).
> > 
> > Suggested-by: Jean-Pierre Geslin <jean-pierre.geslin@....se.com>
> > Suggested-by: Phil Edworthy <phil.edworthy@...esas.com>
> > Signed-off-by: Clément Léger <clement.leger@...tlin.com>
> > ---
> > +static int a5psw_port_bridge_join(struct dsa_switch *ds, int port,
> > +				  struct dsa_bridge bridge,
> > +				  bool *tx_fwd_offload,
> > +				  struct netlink_ext_ack *extack)
> > +{
> > +	struct a5psw *a5psw = ds->priv;
> > +
> > +	/* We only support 1 bridge device */
> > +	if (a5psw->br_dev && bridge.dev != a5psw->br_dev) {
> > +		NL_SET_ERR_MSG_MOD(extack,
> > +				   "Forwarding offload supported
> > for a single bridge");  
> 
> I don't think I saw the dsa_slave_changeupper() patch that avoids
> overwriting the extack when dsa_port_bridge_join() returns
> -EOPNOTSUPP.

Ok, I did not understood that dsa_slave_changeupper() *did* needed to
be modified. I'll do that.

> 
> > +		return -EOPNOTSUPP;
> > +	}
> > +
> > +	a5psw->br_dev = bridge.dev;
> > +	a5psw_flooding_set_resolution(a5psw, port, true);
> > +	a5psw_port_mgmtfwd_set(a5psw, port, false);
> > +
> > +	return 0;  
> 
> By the way, does this switch pass
> tools/testing/selftests/drivers/net/dsa/no_forwarding.sh?

Unfortunately, the board I have only has 2 ports availables and thus, I
can only test one bridge or two separated ports at a time... I *should*
receive a 4 ports one in a near future but that not yet sure.