netdev - Re: [PATCH net-next] net: dsa: rzn1-a5psw: Add vlan support

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Date:   Mon, 16 Jan 2023 09:48:01 +0100
From:   Clément Léger <clement.leger@...tlin.com>
To:     <Arun.Ramadoss@...rochip.com>
Cc:     <olteanv@...il.com>, <andrew@...n.ch>, <linux@...linux.org.uk>,
        <f.fainelli@...il.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <edumazet@...gle.com>, <davem@...emloft.net>,
        <miquel.raynal@...tlin.com>, <linux-kernel@...r.kernel.org>,
        <linux-renesas-soc@...r.kernel.org>, <jimmy.lalande@...com>,
        <herve.codina@...tlin.com>, <milan.stevanovic@...com>,
        <thomas.petazzoni@...tlin.com>, <pascal.eberhard@...com>,
        <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] net: dsa: rzn1-a5psw: Add vlan support

Le Fri, 13 Jan 2023 14:40:26 +0000,
<Arun.Ramadoss@...rochip.com> a écrit :

> Hi Clement,
> On Wed, 2023-01-11 at 12:56 +0100, Clément Léger wrote:
> > Add support for vlan operation (add, del, filtering) on the RZN1
> > driver. The a5psw switch supports up to 32 VLAN IDs with filtering,
> > tagged/untagged VLANs and PVID for each ports.
> > 
> > Signed-off-by: Clément Léger <clement.leger@...tlin.com>
> > ---
> >  drivers/net/dsa/rzn1_a5psw.c | 182
> > +++++++++++++++++++++++++++++++++++
> >  drivers/net/dsa/rzn1_a5psw.h |  10 +-
> >  2 files changed, 189 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/net/dsa/rzn1_a5psw.c
> > b/drivers/net/dsa/rzn1_a5psw.c
> > index ed413d555bec..8ecb9214b5e6 100644
> > --- a/drivers/net/dsa/rzn1_a5psw.c
> > +++ b/drivers/net/dsa/rzn1_a5psw.c
> > @@ -540,6 +540,161 @@ static int a5psw_port_fdb_dump(struct
> > dsa_switch *ds, int port,
> >  	return ret;
> >  }
> >  
> > +static int a5psw_port_vlan_filtering(struct dsa_switch *ds, int
> > port,
> > +				     bool vlan_filtering,
> > +				     struct netlink_ext_ack *extack)
> > +{
> > +	u32 mask = BIT(port + A5PSW_VLAN_VERI_SHIFT)
> > +		   | BIT(port + A5PSW_VLAN_DISC_SHIFT);  
> 
> Operator | at the end of line
> 
> > +	struct a5psw *a5psw = ds->priv;
> > +	u32 val = 0;
> > +
> > +	if (vlan_filtering)
> > +		val = BIT(port + A5PSW_VLAN_VERI_SHIFT)
> > +		      | BIT(port + A5PSW_VLAN_DISC_SHIFT);  
> 
> Operator | at the end of line

Hi Arun,

I'll fix that.

> 
> > +
> > +	a5psw_reg_rmw(a5psw, A5PSW_VLAN_VERIFY, mask, val);
> > +
> > +	return 0;
> > +}
> > +
> > +static int a5psw_port_vlan_add(struct dsa_switch *ds, int port,
> > +			       const struct switchdev_obj_port_vlan
> > *vlan,
> > +			       struct netlink_ext_ack *extack)
> > +{
> > +	bool tagged = !(vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED);
> > +	bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID;
> > +	struct a5psw *a5psw = ds->priv;
> > +	u16 vid = vlan->vid;
> > +	int ret = -EINVAL;
> > +	int vlan_res_id;
> > +
> > +	dev_dbg(a5psw->dev, "Add VLAN %d on port %d, %s, %s\n",
> > +		vid, port, tagged ? "tagged" : "untagged",
> > +		pvid ? "PVID" : "no PVID");
> > +
> > +	mutex_lock(&a5psw->vlan_lock);
> > +
> > +	vlan_res_id = a5psw_find_vlan_entry(a5psw, vid);
> > +	if (vlan_res_id < 0) {
> > +		vlan_res_id = a5psw_get_vlan_res_entry(a5psw, vid);
> > +		if (vlan_res_id < 0)  
> 
> nit: We can initialize ret = 0 initially, and assign ret = -EINVAL here
> & remove ret = 0 at end of function.
> 
> > +			goto out;
> > +	}
> > +
> > +	a5psw_port_vlan_cfg(a5psw, vlan_res_id, port, true);
> > +	if (tagged)
> > +		a5psw_port_vlan_tagged_cfg(a5psw, vlan_res_id, port,
> > true);
> > +
> > +	if (pvid) {
> > +		a5psw_reg_rmw(a5psw, A5PSW_VLAN_IN_MODE_ENA, BIT(port),
> > +			      BIT(port));
> > +		a5psw_reg_writel(a5psw, A5PSW_SYSTEM_TAGINFO(port),
> > vid);
> > +	}
> > +
> > +	ret = 0;
> > +out:
> > +	mutex_unlock(&a5psw->vlan_lock);
> > +
> > +	return ret;
> > +}
> > +
> > +static int a5psw_port_vlan_del(struct dsa_switch *ds, int port,
> > +			       const struct switchdev_obj_port_vlan
> > *vlan)
> > +{
> > +	struct a5psw *a5psw = ds->priv;
> > +	u16 vid = vlan->vid;
> > +	int ret = -EINVAL;  
> 
> Simillarly here.

Since I removed the mutex thanks to the previous comments, I have
removed all the "ret" usage.

Thanks,

-- 
Clément Léger,
Embedded Linux and Kernel engineer at Bootlin
https://bootlin.com