netdev - Re: [PATCH 2/3] net: dsa: mv88e6xxx: add support to dump VLANs

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Date:	Fri, 26 Jun 2015 10:36:01 -0400 (EDT)
From:	Vivien Didelot <vivien.didelot@...oirfairelinux.com>
To:	Andrew Lunn <andrew@...n.ch>
Cc:	netdev <netdev@...r.kernel.org>, David <davem@...emloft.net>,
	Florian Fainelli <f.fainelli@...il.com>,
	Guenter Roeck <linux@...ck-us.net>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	kernel <kernel@...oirfairelinux.com>
Subject: Re: [PATCH 2/3] net: dsa: mv88e6xxx: add support to dump VLANs

Hi Andrew,

On Jun 26, 2015, at 10:10 AM, Andrew Lunn andrew@...n.ch wrote:

> On Tue, Jun 23, 2015 at 05:46:09PM -0400, Vivien Didelot wrote:
>> This commit implements the port_vlan_dump function in the
>> dsa_switch_driver structure for Marvell 88E6xxx compatible switches.
>> 
>> This allows to access a switch VLAN Table Unit from standard userspace
>> commands such as "bridge vlan show".
>> 
>> A populated VTU can give the following output:
>> 
>>     # bridge vlan
>>     port	vlan ids
>>     swp0	None
>>     swp0
>>     swp1	None
>>     swp1
>>     swp2	1000
>> 		1200
>> 
>>     swp2	1000
>> 		1200
>> 
>>     swp3	550 PVID Egress Untagged
>> 
>>     swp3	550 PVID Egress Untagged
>> 
>>     swp4	1200
>> 
>>     swp4	1200
>> 
>>     br0	None
>> 
>> Signed-off-by: Vivien Didelot <vivien.didelot@...oirfairelinux.com>
>> ---
>>  drivers/net/dsa/mv88e6xxx.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
>>  drivers/net/dsa/mv88e6xxx.h |  2 ++
>>  2 files changed, 46 insertions(+)
>> 
>> diff --git a/drivers/net/dsa/mv88e6xxx.c b/drivers/net/dsa/mv88e6xxx.c
>> index 0dce8e8..0d63bf6 100644
>> --- a/drivers/net/dsa/mv88e6xxx.c
>> +++ b/drivers/net/dsa/mv88e6xxx.c
>> @@ -1441,6 +1441,50 @@ static int _mv88e6xxx_vtu_getnext(struct dsa_switch *ds,
>> u16 vid,
>>  	return 0;
>>  }
>>  
>> +int mv88e6xxx_port_vlan_dump(struct dsa_switch *ds, int port, u16 vid,
>> +			     u16 *bridge_flags)
>> +{
>> +	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
>> +	struct mv88e6xxx_vtu_entry entry = { 0 };
>> +	int prev_vid = vid ? vid - 1 : 4095;
>> +	int ret;
>> +
>> +	mutex_lock(&ps->smi_mutex);
>> +	ret = _mv88e6xxx_vtu_getnext(ds, prev_vid, &entry);
>> +	if (ret < 0)
>> +		goto unlock;
>> +
>> +	if (entry.vid != vid || !entry.valid) {
>> +		ret = -ENOENT;
>> +		goto unlock;
>> +	}
>> +
>> +	switch (entry.tags[port]) {
>> +	case GLOBAL_VTU_DATA_MEMBER_TAG_UNTAGGED:
>> +		*bridge_flags |= BRIDGE_VLAN_INFO_UNTAGGED;
>> +		/* fall through... */
>> +	case GLOBAL_VTU_DATA_MEMBER_TAG_TAGGED:
>> +		break;
> 
> A nit pick, but fall through catches people out. Having a fall through
> to a break statements seems like a trap for future coders to fall
> into. I would replace the comment with a break, and let the compiler
> do the optimisation.
> 
>    Andrew

Done.

Thanks,
-v
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