netdev - Re: [patch net-next RFC 05/10] devlink: add port to line card relationship set

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Date:   Fri, 15 Jan 2021 17:53:21 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Ido Schimmel <idosch@...sch.org>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
        jacob.e.keller@...el.com, roopa@...dia.com, mlxsw@...dia.com
Subject: Re: [patch net-next RFC 05/10] devlink: add port to line card
 relationship set

Fri, Jan 15, 2021 at 05:10:48PM CET, idosch@...sch.org wrote:
>On Wed, Jan 13, 2021 at 01:12:17PM +0100, Jiri Pirko wrote:
>> index ec00cd94c626..cb911b6fdeda 100644
>> --- a/include/net/devlink.h
>> +++ b/include/net/devlink.h
>> @@ -137,6 +137,7 @@ struct devlink_port {
>>  	struct delayed_work type_warn_dw;
>>  	struct list_head reporter_list;
>>  	struct mutex reporters_lock; /* Protects reporter_list */
>> +	struct devlink_linecard *linecard;
>>  };
>>  
>>  struct devlink_linecard_ops;
>> @@ -1438,6 +1439,8 @@ void devlink_port_attrs_pci_pf_set(struct devlink_port *devlink_port, u32 contro
>>  				   u16 pf, bool external);
>>  void devlink_port_attrs_pci_vf_set(struct devlink_port *devlink_port, u32 controller,
>>  				   u16 pf, u16 vf, bool external);
>> +void devlink_port_linecard_set(struct devlink_port *devlink_port,
>> +			       struct devlink_linecard *linecard);
>>  struct devlink_linecard *
>>  devlink_linecard_create(struct devlink *devlink, unsigned int linecard_index,
>>  			const struct devlink_linecard_ops *ops, void *priv);
>> diff --git a/net/core/devlink.c b/net/core/devlink.c
>> index 347976b88404..2faa30cc5cce 100644
>> --- a/net/core/devlink.c
>> +++ b/net/core/devlink.c
>> @@ -855,6 +855,10 @@ static int devlink_nl_port_fill(struct sk_buff *msg, struct devlink *devlink,
>>  		goto nla_put_failure;
>>  	if (devlink_nl_port_function_attrs_put(msg, devlink_port, extack))
>>  		goto nla_put_failure;
>> +	if (devlink_port->linecard &&
>> +	    nla_put_u32(msg, DEVLINK_ATTR_LINECARD_INDEX,
>> +			devlink_port->linecard->index))
>> +		goto nla_put_failure;
>>  
>>  	genlmsg_end(msg, hdr);
>>  	return 0;
>> @@ -8642,6 +8646,21 @@ void devlink_port_attrs_pci_vf_set(struct devlink_port *devlink_port, u32 contro
>>  }
>>  EXPORT_SYMBOL_GPL(devlink_port_attrs_pci_vf_set);
>>  
>> +/**
>> + *	devlink_port_linecard_set - Link port with a linecard
>> + *
>> + *	@devlink_port: devlink port
>> + *	@devlink_linecard: devlink linecard
>> + */
>> +void devlink_port_linecard_set(struct devlink_port *devlink_port,
>> +			       struct devlink_linecard *linecard)
>> +{
>> +	if (WARN_ON(devlink_port->registered))
>> +		return;
>> +	devlink_port->linecard = linecard;
>
>We already have devlink_port_attrs_set() that is called before the port
>is registered, why not extend it to also set the linecard information?

I was thinking about that. Looked odd to put the linecard pointer to the
attr struct. I like it better this way. But if you insist.


>
>> +}
>> +EXPORT_SYMBOL_GPL(devlink_port_linecard_set);
>> +
>>  static int __devlink_port_phys_port_name_get(struct devlink_port *devlink_port,
>>  					     char *name, size_t len)
>>  {
>> @@ -8654,7 +8673,11 @@ static int __devlink_port_phys_port_name_get(struct devlink_port *devlink_port,
>>  	switch (attrs->flavour) {
>>  	case DEVLINK_PORT_FLAVOUR_PHYSICAL:
>>  	case DEVLINK_PORT_FLAVOUR_VIRTUAL:
>> -		n = snprintf(name, len, "p%u", attrs->phys.port_number);
>> +		if (devlink_port->linecard)
>> +			n = snprintf(name, len, "l%u",
>> +				     devlink_port->linecard->index);
>> +		n += snprintf(name + n, len - n, "p%u",
>> +			      attrs->phys.port_number);
>>  		if (attrs->split)
>>  			n += snprintf(name + n, len - n, "s%u",
>>  				      attrs->phys.split_subport_number);
>> -- 
>> 2.26.2
>>