netdev - Re: [PATCH 1/1] net: sctp: bug fixing when sctp path recovers

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Message-ID: <5283CDD1.3090309@gmail.com>
Date:	Wed, 13 Nov 2013 20:06:57 +0100
From:	Chang <changxiangzhong@...il.com>
To:	Daniel Borkmann <dborkman@...hat.com>
CC:	Vlad Yasevich <vyasevich@...il.com>, nhorman@...driver.com,
	davem@...emloft.net, linux-sctp@...r.kernel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	dreibh@...ula.no
Subject: Re: [PATCH 1/1] net: sctp: bug fixing when sctp path recovers


On 11/13/2013 09:44 AM, Daniel Borkmann wrote:
> On 11/13/2013 03:54 AM, Chang wrote:
>> On 11/13/2013 03:37 AM, Vlad Yasevich wrote:
>>> On 11/12/2013 08:34 PM, Chang Xiangzhong wrote:
>>>> Look for the __two__ most recently used path/transport and set to 
>>>> active_path
>>>> and retran_path respectively
>
> Please also for the log, elaborate a bit more, explaining what currently
> happens, and what the effects of this bug are, so that later when people
> are looking through the Git log they can easily get what problem you are
> trying to fix; and if possible, add:
>
> Fixes: <12 digits SHA1> ("<commit title>")
>
Yeah, sure, I'll elaborate that more specifically.
I assume the 12-digit SHA1 is the revision number. But may I ask where 
and how shall I add the tag "Fixes" tag? The revision number is 
generated after "git commit", how can I know that in advance?

Best Regards!

>>>> Signed-off-by: changxiangzhong@...il.com
>>>> ---
>>>>   net/sctp/associola.c |    4 ++++
>>>>   1 file changed, 4 insertions(+)
>>>>
>>>> diff --git a/net/sctp/associola.c b/net/sctp/associola.c
>>>> index ab67efc..070011a 100644
>>>> --- a/net/sctp/associola.c
>>>> +++ b/net/sctp/associola.c
>>>> @@ -913,11 +913,15 @@ void sctp_assoc_control_transport(struct 
>>>> sctp_association *asoc,
>>>>           if (!first || t->last_time_heard > first->last_time_heard) {
>>>>               second = first;
>>>>               first = t;
>>>> +            continue;
>>>>           }
>>>>           if (!second || t->last_time_heard > second->last_time_heard)
>>>>               second = t;
>>>
>>> You might as well remove this bit and then you don't need a continue.
>> I don't think we could remove this bit. My understanding of these 
>> algorithms are to find the 1st recently used path and the 2nd, 
>> assigning to active_path and retran_path respectively. If we remove 
>> the looking-for-second block, how are we suppose to find the 2nd?
>> I think we can remove the continue and use else-if in the 
>> 2nd-assignment-block.
>>>
>>>>       }
>>>>
>>>> +    if (!second)
>>>> +        second = first;
>>>> +
>>>
>>> This needs to move down 1 more block.  Set the second transport 
>>> after we
>>> check to see if the primary is back up and we need to go back to 
>>> using it.
>>>
>>> -vlad
>>>
>> I agree with this change
>>>>       /* RFC 2960 6.4 Multi-Homed SCTP Endpoints
>>>>        *
>>>>        * By default, an endpoint should always transmit to the
>>>>
>>>
>>
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