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

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Message-ID: <862a5fb4-7a3c-9c3f-bd50-f25bbcb2ca59@gmail.com>
Date:   Thu, 17 May 2018 15:06:36 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Andrew Lunn <andrew@...n.ch>, Jiri Pirko <jiri@...nulli.us>
Cc:     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 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);
        if (err)
                return err;

        switch (dp->type) {
-       case DSA_PORT_TYPE_UNUSED:
-               break;
        case DSA_PORT_TYPE_CPU:
        case DSA_PORT_TYPE_DSA:
                err = dsa_port_link_register_of(dp);
@@ -286,6 +287,8 @@ static int dsa_port_setup(struct dsa_port *dp)
                else
                        devlink_port_type_eth_set(&dp->devlink_port,
dp->slave);
                break;
+       default:
+               break;
        }

        return 0;
@@ -293,11 +296,12 @@ static int dsa_port_setup(struct dsa_port *dp)

 static void dsa_port_teardown(struct dsa_port *dp)
 {
+       if (dp->type == DSA_PORT_TYPE_UNUSED)
+               return;
+
        devlink_port_unregister(&dp->devlink_port);

        switch (dp->type) {
-       case DSA_PORT_TYPE_UNUSED:
-               break;
        case DSA_PORT_TYPE_CPU:
        case DSA_PORT_TYPE_DSA:
                dsa_port_link_unregister_of(dp);
@@ -308,6 +312,8 @@ static void dsa_port_teardown(struct dsa_port *dp)
                        dp->slave = NULL;
                }
                break;
+       default:
+               break;
        }
 }


-- 
Florian