netdev - Re: [PATCH net-next v7 8/9] net: lan966x: Extend switchdev bridge flags

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Date:   Sat, 18 Dec 2021 13:55:43 +0100
From:   Horatiu Vultur <horatiu.vultur@...rochip.com>
To:     Vladimir Oltean <vladimir.oltean@....com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>,
        "linux@...linux.org.uk" <linux@...linux.org.uk>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "vivien.didelot@...il.com" <vivien.didelot@...il.com>,
        "andrew@...n.ch" <andrew@...n.ch>
Subject: Re: [PATCH net-next v7 8/9] net: lan966x: Extend switchdev bridge
 flags

The 12/17/2021 17:40, Vladimir Oltean wrote:
> 
> On Fri, Dec 17, 2021 at 04:53:52PM +0100, Horatiu Vultur wrote:
> > Currently allow a port to be part or not of the multicast flooding mask.
> > By implementing the switchdev calls SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS
> > and SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS.
> >
> > Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>
> > ---
> >  .../microchip/lan966x/lan966x_switchdev.c     | 34 +++++++++++++++++++
> >  1 file changed, 34 insertions(+)
> >
> > diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c b/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c
> > index cef9e690fb82..af227b33cb3f 100644
> > --- a/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c
> > +++ b/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c
> > @@ -9,6 +9,34 @@ static struct notifier_block lan966x_netdevice_nb __read_mostly;
> >  static struct notifier_block lan966x_switchdev_nb __read_mostly;
> >  static struct notifier_block lan966x_switchdev_blocking_nb __read_mostly;
> >
> > +static void lan966x_port_bridge_flags(struct lan966x_port *port,
> > +                                   struct switchdev_brport_flags flags)
> > +{
> > +     u32 val = lan_rd(port->lan966x, ANA_PGID(PGID_MC));
> > +
> > +     val = ANA_PGID_PGID_GET(val);
> 
> Ideally you'd want to read PGID_MC only if you know that BR_MCAST_FLOOD
> is the flag getting changed. Otherwise you'd have to refactor this when
> you add support for more brport flags.

I can see your point. I will refactor this now, such that when new flags
are added this should not be changed.

> 
> > +
> > +     if (flags.mask & BR_MCAST_FLOOD) {
> > +             if (flags.val & BR_MCAST_FLOOD)
> > +                     val |= BIT(port->chip_port);
> > +             else
> > +                     val &= ~BIT(port->chip_port);
> > +     }
> > +
> > +     lan_rmw(ANA_PGID_PGID_SET(val),
> > +             ANA_PGID_PGID,
> > +             port->lan966x, ANA_PGID(PGID_MC));
> > +}
> > +
> > +static int lan966x_port_pre_bridge_flags(struct lan966x_port *port,
> > +                                      struct switchdev_brport_flags flags)
> > +{
> > +     if (flags.mask & ~BR_MCAST_FLOOD)
> > +             return -EINVAL;
> > +
> > +     return 0;
> > +}
> > +
> >  static void lan966x_update_fwd_mask(struct lan966x *lan966x)
> >  {
> >       int i;
> > @@ -67,6 +95,12 @@ static int lan966x_port_attr_set(struct net_device *dev, const void *ctx,
> >               return 0;
> >
> >       switch (attr->id) {
> > +     case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
> > +             lan966x_port_bridge_flags(port, attr->u.brport_flags);
> > +             break;
> > +     case SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS:
> > +             err = lan966x_port_pre_bridge_flags(port, attr->u.brport_flags);
> > +             break;
> >       case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
> >               lan966x_port_stp_state_set(port, attr->u.stp_state);
> >               break;
> > --
> > 2.33.0
> >

-- 
/Horatiu