netdev - Re: [PATCH net 2/2] bridge: multicast: start querier timer when running user-space stp

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Message-Id: <0872B4B8-66E5-487A-8F75-3A4AA856EBE4@cumulusnetworks.com>
Date:	Thu, 18 Jun 2015 20:35:09 +0300
From:	Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	netdev@...r.kernel.org, stephen@...workplumber.org,
	davem@...emloft.net, sashok@...ulusnetworks.com
Subject: Re: [PATCH net 2/2] bridge: multicast: start querier timer when running user-space stp


> On Jun 18, 2015, at 6:37 AM, Herbert Xu <herbert@...dor.apana.org.au> wrote:
> 
> On Wed, Jun 17, 2015 at 04:28:31AM -0700, Nikolay Aleksandrov wrote:
>> From: Satish Ashok <sashok@...ulusnetworks.com>
>> 
>> When STP is running in user-space and querier is configured, the
>> querier timer is not started when a port goes to forwarding state.
>> 
>> Signed-off-by: Satish Ashok <sashok@...ulusnetworks.com>
>> Signed-off-by: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
>> Fixes: eb1d16414339 ("bridge: Add core IGMP snooping support")
>> ---
>> net/bridge/br_stp.c | 3 +++
>> 1 file changed, 3 insertions(+)
>> 
>> diff --git a/net/bridge/br_stp.c b/net/bridge/br_stp.c
>> index fb3ebe615513..1e2f2f1ff6b0 100644
>> --- a/net/bridge/br_stp.c
>> +++ b/net/bridge/br_stp.c
>> @@ -456,6 +456,9 @@ void br_port_state_selection(struct net_bridge *br)
>> 				p->topology_change_ack = 0;
>> 				br_make_blocking(p);
>> 			}
>> +		} else if (br->stp_enabled == BR_USER_STP &&
>> +			   p->state == BR_STATE_FORWARDING) {
>> +			br_multicast_enable_port(p);
>> 		}
> 
> Minor nit, the stp_enabled check appears to be redundant since
> you're in the else clause.
> 

Right you are, I’ve overlooked it.

> More importantly, I'm not sure about the logic.  For kernel STP,
> we enable the port as soon as we get out of blocking.  IIRC enabling
> the port just means that we start tracking subscriptions/queries
> so it should be OK to do even while we're listening/learning.
> 
> In any case the logic should be identical whether we use kernel
> STP or user-space STP.
> 
> So how about removing br_multicast_enable_port from br_make_forward
> and just add it here for both kernel and user-space STP?
> 
> Thanks,
> -- 
> Email: Herbert Xu <herbert@...dor.apana.org.au>
> Home Page: http://gondor.apana.org.au/~herbert/
> PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

Makes sense, I’ll re-spin, test and post a v2. Thank you for the suggestion.

Cheers,
 Nik


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