netdev - Re: [PATCH net-next v6 6/6] net: dsa: microchip: ksz8: move all DSA configurations to one location

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Date:   Fri, 25 Nov 2022 07:14:32 +0000
From:   <Arun.Ramadoss@...rochip.com>
To:     <o.rempel@...gutronix.de>
CC:     <olteanv@...il.com>, <UNGLinuxDriver@...rochip.com>,
        <linux-kernel@...r.kernel.org>, <vivien.didelot@...il.com>,
        <andrew@...n.ch>, <f.fainelli@...il.com>, <kuba@...nel.org>,
        <edumazet@...gle.com>, <pabeni@...hat.com>,
        <netdev@...r.kernel.org>, <Woojung.Huh@...rochip.com>,
        <davem@...emloft.net>, <kernel@...gutronix.de>
Subject: Re: [PATCH net-next v6 6/6] net: dsa: microchip: ksz8: move all DSA
 configurations to one location

Hi Oleksij,

On Fri, 2022-11-25 at 06:52 +0100, Oleksij Rempel wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you
> know the content is safe
> 
> Hi Arun,
> 
> On Thu, Nov 24, 2022 at 03:05:27PM +0000, Arun.Ramadoss@...rochip.com
>  wrote:
> > Hi Oleksij,
> > On Thu, 2022-11-24 at 11:14 +0100, Oleksij Rempel wrote:
> > > EXTERNAL EMAIL: Do not click links or open attachments unless you
> > > know the content is safe
> > > 
> > > To make the code more comparable to KSZ9477 code, move DSA
> > > configurations to the same location.
> > > 
> > > Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> > > ---
> > >  drivers/net/dsa/microchip/ksz8795.c | 20 ++++++++++----------
> > >  1 file changed, 10 insertions(+), 10 deletions(-)
> > > 
> > > diff --git a/drivers/net/dsa/microchip/ksz8795.c
> > > b/drivers/net/dsa/microchip/ksz8795.c
> > > index 060e41b9b6ef..003b0ac2854c 100644
> > > --- a/drivers/net/dsa/microchip/ksz8795.c
> > > +++ b/drivers/net/dsa/microchip/ksz8795.c
> > > @@ -1359,6 +1359,16 @@ int ksz8_setup(struct dsa_switch *ds)
> > > 
> > >         ds->mtu_enforcement_ingress = true;
> > > 
> > > +       /* We rely on software untagging on the CPU port, so that
> > > we
> > > +        * can support both tagged and untagged VLANs
> > > +        */
> > > +       ds->untag_bridge_pvid = true;
> > > +
> > > +       /* VLAN filtering is partly controlled by the global VLAN
> > > +        * Enable flag
> > > +        */
> > > +       ds->vlan_filtering_is_global = true;
> > > +
> > >         ksz_cfg(dev, S_REPLACE_VID_CTRL, SW_FLOW_CTRL, true);
> > > 
> > >         /* Enable automatic fast aging when link changed
> > > detected. */
> > > @@ -1418,16 +1428,6 @@ int ksz8_switch_init(struct ksz_device
> > > *dev)
> > >         dev->phy_port_cnt = dev->info->port_cnt - 1;
> > >         dev->port_mask = (BIT(dev->phy_port_cnt) - 1) | dev-
> > > >info-
> > > > cpu_ports;
> > 
> > Since you moved dsa related items to ksz8_setup, remaining items in
> > ksz8_switch_init are
> > - dev->cpu_port - Used in ksz_setup but called after the individual
> > switch setup function. We can move it ksz8_setup.
> > - dev->phy_port_cnt - Used in ksz8_vlan_filtering and
> > ksz8_config_cpuport. We can move.
> > - dev->port_mask - used in ksz_switch_register. So we cannot move.
> > 
> > To make the ksz8_switch_init and ksz9477_switch_init function
> > similar,
> > we can move dev->cpu_port and dev->phy_port_cnt from
> > ksz8_switch_init
> > to ksz8_setup
> 
> It make no sense to move this variables. Every place where they are
> used, can be replaced with dsa functions like:
> dsa_switch_for_each_user_port() or dsa_cpu_ports()/dsa_is_cpu_port()
> Making this changes within this patch set make no sense to.

Agreed. 
I thought of cleaning up
ksz8_switch_init/ksz9477_switch_init/lan937x_switch_init, since these
functions are not performing any useful activity other than
initializing these variables. Similarly all the exit function are
performing same reset function. I thought these init and exit function
in the ksz_dev_ops structure is reduntant.

> 
> Regards,
> Oleksij
> --
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