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

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Date:   Fri, 18 May 2018 08:55:35 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Florian Fainelli <f.fainelli@...il.com>, netdev@...r.kernel.org,
        davem@...emloft.net, idosch@...lanox.com,
        jakub.kicinski@...ronome.com, mlxsw@...lanox.com,
        vivien.didelot@...oirfairelinux.com, michael.chan@...adcom.com,
        ganeshgr@...lsio.com, saeedm@...lanox.com,
        simon.horman@...ronome.com, pieter.jansenvanvuuren@...ronome.com,
        john.hurley@...ronome.com, dirk.vandermerwe@...ronome.com,
        alexander.h.duyck@...el.com, ogerlitz@...lanox.com,
        dsahern@...il.com, vijaya.guvva@...ium.com,
        satananda.burla@...ium.com, raghu.vatsavayi@...ium.com,
        felix.manlunas@...ium.com, gospo@...adcom.com,
        sathya.perla@...adcom.com, vasundhara-v.volam@...adcom.com,
        tariqt@...lanox.com, eranbe@...lanox.com,
        jeffrey.t.kirsher@...el.com
Subject: Re: [patch net-next RFC 04/12] dsa: set devlink port attrs for dsa
 ports

Fri, May 18, 2018 at 12:40:17AM CEST, andrew@...n.ch wrote:
>On Thu, May 17, 2018 at 03:06:36PM -0700, Florian Fainelli wrote:
>> On 05/17/2018 02:08 PM, Andrew Lunn wrote:
>> > On Thu, May 17, 2018 at 10:48:55PM +0200, Jiri Pirko wrote:
>> >> Thu, May 17, 2018 at 09:14:32PM CEST, f.fainelli@...il.com wrote:
>> >>> On 05/17/2018 10:39 AM, Jiri Pirko wrote:
>> >>>>>> 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 output with my patchset looks like this now:

salt:~/iproute2$ sudo devlink/devlink port
mdio_bus/fixed-0:1f/0: type eth netdev lan1 flavour physical number 0
mdio_bus/fixed-0:1f/1: type eth netdev lan2 flavour physical number 1
mdio_bus/fixed-0:1f/2: type eth netdev lan3 flavour physical number 2
mdio_bus/fixed-0:1f/3: type eth netdev lan4 flavour physical number 3
mdio_bus/fixed-0:1f/4: type notset
mdio_bus/fixed-0:1f/5: type notset flavour cpu number 5
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