Re: [patch net-next RFC 04/12] dsa: set devlink port attrs for dsa ports

On 05/17/2018 03:40 PM, Andrew Lunn wrote:

On Thu, May 17, 2018 at 03:06:36PM -0700, Florian Fainelli wrote:

quoted

On 05/17/2018 02:08 PM, Andrew Lunn wrote:

quoted

On Thu, May 17, 2018 at 10:48:55PM +0200, Jiri Pirko wrote:

quoted

Thu, May 17, 2018 at 09:14:32PM CEST, f.fainelli@gmail.com wrote:

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On 05/17/2018 10:39 AM, Jiri Pirko wrote:

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That is compiled inside "fixed_phy", isn't it?

It matches what CONFIG_FIXED_PHY is, so if it's built-in it also becomes
built-in, if is modular, it is also modular, this was fixed with
40013ff20b1beed31184935fc0aea6a859d4d4ef ("net: dsa: Fix functional
dsa-loop dependency on FIXED_PHY")

Now I have it compiled as module, and after modprobe dsa_loop I see:
[ 1168.129202] libphy: Fixed MDIO Bus: probed
[ 1168.222716] dsa-loop fixed-0:1f: DSA mockup driver: 0x1f

This messages I did not see when I had fixed_phy compiled as buildin.

But I still see no netdevs :/

The platform data assumes there is a network device named "eth0" as the

Oups, I missed, I created dummy device and modprobed again. Now I see:

$ sudo devlink port
mdio_bus/fixed-0:1f/0: type eth netdev lan1
mdio_bus/fixed-0:1f/1: type eth netdev lan2
mdio_bus/fixed-0:1f/2: type eth netdev lan3
mdio_bus/fixed-0:1f/3: type eth netdev lan4
mdio_bus/fixed-0:1f/4: type notset
mdio_bus/fixed-0:1f/5: type notset
mdio_bus/fixed-0:1f/6: type notset
mdio_bus/fixed-0:1f/7: type notset
mdio_bus/fixed-0:1f/8: type notset
mdio_bus/fixed-0:1f/9: type notset
mdio_bus/fixed-0:1f/10: type notset
mdio_bus/fixed-0:1f/11: type notset

I wonder why there are ports 4-11

Hi Jiri

        ds = dsa_switch_alloc(&mdiodev->dev, DSA_MAX_PORTS);

It is allocating a switch with 12 ports. However only 4 of them have
names. So the core only creates slave devices for those 4.

This is a useful test. Real hardware often has unused ports. A WiFi AP
with a 7 port switch which only uses 6 ports is often seen.

The following patch should fix this:

diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index adf50fbc4c13..a06c29ec91f0 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c

@@ -262,13 +262,14 @@ static int dsa_port_setup(struct dsa_port *dp)

        memset(&dp->devlink_port, 0, sizeof(dp->devlink_port));

+       if (dp->type == DSA_PORT_TYPE_UNUSED)
+               return 0;
+
        err = devlink_port_register(ds->devlink, &dp->devlink_port,

dp->index);

Hi Florian, Jiri

Maybe it is better to add a devlink port type unused?

The port does not exist on the switch, so it should not even be
registered IMHO.
-- 
Florian