netdev - Re: [PATCH net-next 2/2] mv88e6131: bonding: implement single device trunking

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Date:	Fri, 20 Feb 2015 16:56:55 +0100 (CET)
From:	Jonas Johansson <jonasj76@...il.com>
To:	Andrew Lunn <andrew@...n.ch>
cc:	Jonas Johansson <jonasj76@...il.com>, netdev@...r.kernel.org,
	Jonas Johansson <jonas.johansson@...termo.se>
Subject: Re: [PATCH net-next 2/2] mv88e6131: bonding: implement single device
 trunking



On Fri, 20 Feb 2015, Andrew Lunn wrote:

> On Fri, Feb 20, 2015 at 11:51:13AM +0100, Jonas Johansson wrote:
>> From: Jonas Johansson <jonas.johansson@...termo.se>
>>
>> This patch will use the DSA hardware bonding support hooks to setup trunking
>> for the Marvell 88E6095 device. The implementation only handles trunking in
>> a single device.
>>
>> Hooks:
>>  .bond_add_group: Add port to a bond group
>>  .bond_del_group: Remove port from a bond group
>>  .bond_attach: Attach/activate port in bond group
>>  .bond_detach: Detach/inactivate port in bond group
>>
>> Procedure to add/remome port from bond group:
>>  Setup trunk learning (Port Association Vector)
>>  Setup loop prevention (VLAN Table)
>>  Setup load balancing (Trunk Mask Load Balance Table)
>>
>> Procedure to attach/detach port:
>>  Change load balancing (Trunk Mask Load Balance Table)
>>
>> Signed-off-by: Jonas Johansson <jonas.johansson@...termo.se>
>> ---
>>  drivers/net/dsa/mv88e6131.c | 254 ++++++++++++++++++++++++++++++++++++++++++++
>>  drivers/net/dsa/mv88e6xxx.h |  14 +++
>>  2 files changed, 268 insertions(+)
>>
>> diff --git a/drivers/net/dsa/mv88e6131.c b/drivers/net/dsa/mv88e6131.c
>> index 2540ef0..3ba7a0c 100644
>> --- a/drivers/net/dsa/mv88e6131.c
>> +++ b/drivers/net/dsa/mv88e6131.c
>> @@ -382,6 +382,256 @@ mv88e6131_get_ethtool_stats(struct dsa_switch *ds,
>>  				    mv88e6131_hw_stats, port, data);
>>  }
>>
>> +/* Trunking */
>> +static int mv88e6131_bond_set_trunk_learning(struct dsa_switch *ds,
>> +					     int *ports, size_t num)
>> +{
>> +	u16 port_vec = 0;
>> +	int ret;
>> +	int i;
>> +
>> +	num = num < MAX_PORTS ? num : MAX_PORTS;
>> +
>> +	for (i = 0; i < num; i++)
>> +		port_vec |= 1 << ports[i];
>> +
>> +	for (i = 0; i < num; i++) {
>> +		ret = mv88e6xxx_reg_read(ds, REG_PORT(ports[i]), REG_PORT_PAV);
>> +		if (ret < 0)
>> +			continue;
>> +		ret = (ret & 0xf800) | (port_vec & 0x7ff);
>> +		mv88e6xxx_reg_write(ds, REG_PORT(ports[i]), REG_PORT_PAV, ret);
>> +	}
>> +
>> +	return 0;
>> +}
>
> The mv886060 seems to have the PAV register. So i guess most of the
> Marvell switches support this. Is there anything specific to the 6131
> here? Could this be moved into mv88x6xxx so other switch drivers can
> use it?
>
I guess you are correct, i'll look into it.
>> +
>> +static int mv88e6131_bond_set_loop_prevention(struct dsa_switch *ds,
>> +					      int *ports, size_t num)
>> +{
>> +	u16 port_vec = 0;
>> +	int ret;
>> +	int i;
>> +
>> +	num = num < MAX_PORTS ? num : MAX_PORTS;
>> +
>> +	for (i = 0; i < num; i++)
>> +		port_vec |= 1 << ports[i];
>> +
>> +	for (i = 0; i < num; i++) {
>> +		ret = mv88e6xxx_reg_read(ds, REG_PORT(ports[i]), REG_PORT_VLAN_MAP);
>> +		if (ret < 0)
>> +			continue;
>> +		ret &= ~port_vec & 0x7ff;
>> +		mv88e6xxx_reg_write(ds, REG_PORT(ports[i]), REG_PORT_VLAN_MAP, ret);
>> +	}
>> +
>> +	return 0;
>> +}
>
> Same question again, anything specific to the 6131 here?
>
I'll check.
>> +static int mv88e6131_wait_trunk_mask(struct dsa_switch *ds)
>> +{
>> +	const int max_retries = 10;
>> +	int retries = 0;
>> +	int ret;
>> +
>> +	/* Wait for update Trunk Mask data */
>> +	while (1) {
>> +		ret = REG_READ(REG_GLOBAL2, REG_TRUNK_MASK);
>> +		if (!(ret & 0x8000))
>> +			return ret;
>> +		if (retries > max_retries) {
>> +			pr_warn("mv88e6131: Timeout waiting for "
>> +				"Trunk Mask Table Register Update\n");
>> +			return -EBUSY;
>> +		}
>> +		retries++;
>> +		usleep_range(20, 50);
>> +	};
>
> This looks a lot like the wait functions what Guenter Roeck added to
> 6352 and i just moved to mv88e6xxx.c. Please use the generic
> infrastructure in the shared code.
>
Seems like the function is doing exactly what I'm looking for.
> Please could you look at all your functions and see what is specific
> to the 6131 and what is generic. Place the generic code into mv88e6xxx
> please so we can all use it.
>
>       Thanks
> 	Andrew
>
Thanks for your review, I'll check if the functions is specific to the 
6131 or if it the code could be moved to mv88e6xxx.c.
On vacation a.t.m, back in a week.
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