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

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Message-ID: <20180324072838.GB1891@nanopsycho>
Date:   Sat, 24 Mar 2018 08:28:38 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>, 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, Mar 23, 2018 at 06:09:29PM CET, f.fainelli@...il.com wrote:
>On 03/23/2018 07:49 AM, Jiri Pirko wrote:
>> Fri, Mar 23, 2018 at 02:30:02PM CET, andrew@...n.ch wrote:
>>> On Thu, Mar 22, 2018 at 11:55:14AM +0100, Jiri Pirko wrote:
>>>> From: Jiri Pirko <jiri@...lanox.com>
>>>>
>>>> Set the attrs and allow to expose port flavour to user via devlink.
>>>>
>>>> Signed-off-by: Jiri Pirko <jiri@...lanox.com>
>>>> ---
>>>>  net/dsa/dsa2.c | 23 +++++++++++++++++++++++
>>>>  1 file changed, 23 insertions(+)
>>>>
>>>> diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
>>>> index adf50fbc4c13..49453690696d 100644
>>>> --- a/net/dsa/dsa2.c
>>>> +++ b/net/dsa/dsa2.c
>>>> @@ -270,7 +270,27 @@ static int dsa_port_setup(struct dsa_port *dp)
>>>>  	case DSA_PORT_TYPE_UNUSED:
>>>>  		break;
>>>>  	case DSA_PORT_TYPE_CPU:
>>>> +		/* dp->index is used now as port_number. However
>>>> +		 * CPU ports should have separate numbering
>>>> +		 * independent from front panel port numbers.
>>>> +		 */
>>>> +		devlink_port_attrs_set(&dp->devlink_port,
>>>> +				       DEVLINK_PORT_FLAVOUR_CPU,
>>>> +				       dp->index, false, 0);
>>>> +		err = dsa_port_link_register_of(dp);
>>>> +		if (err) {
>>>> +			dev_err(ds->dev, "failed to setup link for port %d.%d\n",
>>>> +				ds->index, dp->index);
>>>> +			return err;
>>>> +		}
>>>
>>> Ah, i get it. These used to be two case statements with one code
>>> block. But you split them apart, so needed to duplicate the
>>> dsa_port_link_register.
>>>
>>> Unfortunately, you forgot to add a 'break;', so it still falls
>>> through, and overwrites the port flavour to DSA.
>> 
>> ah, crap. Don't have hw to test this :/
>> Will fix. Thanks!
>
>You don't need hardware, there is drivers/net/dsa/dsa_loop.c which will
>emulate a DSA switch. It won't create interconnect ports, since only one
>switch can be created with the method chosen, but this would have helped
>you catch the missing break since the "CPU" port would have been
>displayed as "DSA" anyway.

Okay.


>
>If you need hardware, I am sure this can be somehow arranged. By that, I
>mean something on which you can run upstream Linux on without out of
>tree patches.

Andrew is already taking care of that. Thanks.