netdev - Re: [PATCH net-next 1/3] net: dsa: add support for bridge flags

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Date:   Mon, 18 Feb 2019 11:23:55 +0000
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH net-next 1/3] net: dsa: add support for bridge flags

On Mon, Feb 18, 2019 at 12:50:31AM +0000, Russell King - ARM Linux admin wrote:
> From what I can see, the port_vlan_add()/port_vlan_del() implementation
> is far from ideal, just like "always enabling flooding for CPU/DSA
> ports" is not ideal.

There also seems to be a discrepency between what net/dsa wants to do
and some of the implementations in drivers/net/dsa:

dsa_switch_vlan_add() does this:

        bitmap_zero(ds->bitmap, ds->num_ports);
        if (ds->index == info->sw_index)
                set_bit(info->port, ds->bitmap);
        for (port = 0; port < ds->num_ports; port++)
                if (dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port))
                        set_bit(port, ds->bitmap);

We then call ds->ops->port_vlan_add() for each port in ds->bitmap,
which will include DSA and CPU ports on every switch in the tree.

For rtl8366, this calls into rtl8366_vlan_add(), which does:

        if (dsa_is_dsa_port(ds, port) || dsa_is_cpu_port(ds, port))
                dev_err(smi->dev, "port is DSA or CPU port\n");

which is surely a guaranteed error message if we have any CPU or DSA
ports specified on a rtl8366.  The example in the DT documentation
for this driver does suggest that it is capable of having CPU ports.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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