netdev - Re: [patch net-next RFC 2/8] net: devlink: extend port attrs for switch ID

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Date:   Sat, 2 Mar 2019 08:34:38 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, mlxsw@...lanox.com,
        idosch@...lanox.com, jakub.kicinski@...ronome.com,
        dirk.vandermerwe@...ronome.com, andrew@...n.ch,
        vivien.didelot@...il.com
Subject: Re: [patch net-next RFC 2/8] net: devlink: extend port attrs for
 switch ID

Sat, Mar 02, 2019 at 03:53:47AM CET, f.fainelli@...il.com wrote:
>
>
>On 3/1/2019 8:05 AM, Jiri Pirko wrote:
>> From: Jiri Pirko <jiri@...lanox.com>
>> 
>> Extend devlink_port_attrs_set() to pass switch ID for ports which are
>> part of switch and store it in port attrs. For other ports, this is
>> NULL. During dump to userspace only valid switch ID is filled up.
>> Note that this allows the driver to group devlink ports into one or more
>> switches according to the actual topology.
>> 
>> Signed-off-by: Jiri Pirko <jiri@...lanox.com>
>> ---
>
>[snip]
>
>> @@ -5415,6 +5423,15 @@ void devlink_port_attrs_set(struct devlink_port *devlink_port,
>>  	attrs->port_number = port_number;
>>  	attrs->split = split;
>>  	attrs->split_subport_number = split_subport_number;
>> +	if (switch_id) {
>> +		attrs->switch_port = true;
>> +		if (WARN_ON(switch_id_len > MAX_PHYS_ITEM_ID_LEN))
>> +			switch_id_len = MAX_PHYS_ITEM_ID_LEN;
>> +		memcpy(attrs->switch_id.id, switch_id, switch_id_len);
>> +		attrs->switch_id.id_len = switch_id_len;
>> +	} else {
>> +		attrs->switch_port = false;
>
>Would not switch_id.id_len != 0 be enough of an indicator that this is a
>switch port?

Might be, yes. On the other hand. attrs->switch_port is just one bit..

>-- 
>Florian