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

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Date:   Thu, 17 May 2018 15:45:23 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Jiri Pirko <jiri@...nulli.us>, 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

On 05/17/2018 03:40 PM, Andrew Lunn 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 port does not exist on the switch, so it should not even be
registered IMHO.
-- 
Florian