netdev - Re: [PATCH RFC 2/2] net: dsa: bcm_sf2: implement HW bridging operations

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Message-ID: <54E61CFB.3010109@gmail.com>
Date:	Thu, 19 Feb 2015 09:27:23 -0800
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Guenter Roeck <linux@...ck-us.net>
CC:	netdev@...r.kernel.org, davem@...emloft.net,
	vivien.didelot@...oirfairelinux.com,
	jerome.oufella@...oirfairelinux.com, andrew@...n.ch,
	cphealy@...il.com
Subject: Re: [PATCH RFC 2/2] net: dsa: bcm_sf2: implement HW bridging operations

On 18/02/15 21:59, Guenter Roeck wrote:
> On Wed, Feb 18, 2015 at 06:48:19PM -0800, Florian Fainelli wrote:
>> On 17/02/15 11:26, Florian Fainelli wrote:
>>> Update the Broadcom Starfighter 2 switch driver to implement the
>>> join/leave/stp_update callbacks required for basic hardware bridging
>>> support.
>>>
>>> There is not much to be done at the driver level but translating the
>>> STP state from Linux to their HW values.
>>>
>>> Joining a bridge means that the joining port and the other port members
>>> need to be in the same VLAN membership as the CPU, while leaving the
>>> bridge puts the port back into a separate VLAN membership with only the
>>> CPU.
>>
>> I found a couple additional issues while testing:
>>
>> - manipulating UP/DOWN state of interfaces that are part of a bridge
>> would not restore their bridge membership
>>
>> - removing an interface from a bridge and bringing it back up would
>> leave it in blocked state
>>
> Is this a problem with your implementation for sf2 or a generic problem
> with the first patch, such as some missing state transitions ?

This is more of a side effect of having HW (an Ethernet switch) that can
really block a given port, based on last night's discussion with Roopa,
we can either fix this at the DSA level (in our case) or better fix this
at the bridge layer, I will propose a fix for this shortly.

> 
> For sf2, you might have to set the port state as well as the bridge
> association in the port_setup function. That is of course just a
> wild guess.

Right, that's what I ended up doing. Thanks!
-- 
Florian
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