linux-kernel - Re: [PATCH net-next v2 3/3] net: lan966x: Extend switchdev with mdb support

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Date:   Tue, 4 Jan 2022 14:36:54 +0100
From:   Horatiu Vultur <horatiu.vultur@...rochip.com>
To:     Vladimir Oltean <vladimir.oltean@....com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "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 v2 3/3] net: lan966x: Extend switchdev with mdb
 support

The 01/04/2022 11:12, Vladimir Oltean wrote:
> 
> On Tue, Jan 04, 2022 at 11:18:49AM +0100, Horatiu Vultur wrote:
> > +static int lan966x_mdb_ip_del(struct lan966x_port *port,
> > +                           const struct switchdev_obj_port_mdb *mdb,
> > +                           enum macaccess_entry_type type)
> > +{
> > +     bool cpu_port = netif_is_bridge_master(mdb->obj.orig_dev);
> > +     struct lan966x *lan966x = port->lan966x;
> > +     struct lan966x_mdb_entry *mdb_entry;
> > +     unsigned char mac[ETH_ALEN];
> > +
> > +     mdb_entry = lan966x_mdb_entry_get(lan966x, mdb->addr, mdb->vid);
> > +     if (!mdb_entry)
> > +             return -ENOENT;
> > +
> > +     lan966x_mdb_encode_mac(mac, mdb_entry, type);
> > +     lan966x_mac_forget(lan966x, mac, mdb_entry->vid, type);
> > +
> > +     if (cpu_port)
> > +             mdb_entry->cpu_copy--;
> 
> Can you code this in such a way that you don't forget and then re-learn
> the entry if you only do a cpu_copy-- which doesn't reach zero?

I think it is possible to do this. I will do that.

> 
> > +     else
> > +             mdb_entry->ports &= ~BIT(port->chip_port);
> > +
> > +     if (!mdb_entry->ports && !mdb_entry->cpu_copy) {
> > +             list_del(&mdb_entry->list);
> > +             kfree(mdb_entry);
> > +             return 0;
> > +     }
> > +
> > +     lan966x_mdb_encode_mac(mac, mdb_entry, type);
> > +     return lan966x_mac_ip_learn(lan966x, mdb_entry->cpu_copy,
> > +                                 mac, mdb_entry->vid, type);
> > +}

-- 
/Horatiu