netdev - Re: [PATCH] sctp: Make "Invalid Stream Identifier" ERROR follows SACK when bundling

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Date:	Wed, 25 Jul 2012 10:28:19 +0800
From:	Xufeng Zhang <xufengzhang.main@...il.com>
To:	Vlad Yasevich <vyasevich@...il.com>
Cc:	xufeng zhang <xufeng.zhang@...driver.com>, sri@...ibm.com,
	davem@...emloft.net, linux-sctp@...r.kernel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sctp: Make "Invalid Stream Identifier" ERROR follows SACK
 when bundling

On 7/24/12, Vlad Yasevich <vyasevich@...il.com> wrote:
>>>> And I should clarify the above judgment code.
>>>> AFAIK, there should be two cases for the bundling when invalid
>>stream
>>>> identifier error happens:
>>>> 1). COOKIE_ACK ERROR SACK
>>>> 2). ERROR SACK
>>>> So I need to deal with the two cases differently.
>>>>
>>>>
>>> Sorry but I just don't buy that the above are the only 2 cases.  What
>>if there are addip chunks as well?  What if there are some other
>>extensions also.  This code has to be generic enough to handle any
>>condition.
>>>
>>Aha, you are right, this may happens.
>>So I think the general solution is to fix this problem in the enqueue
>>side.
>>What do you think? any better suggestion!
>>
>
> Don't have code in front of me but what if we carry the error condition to
> where we queue the Sack and add the error side effect then?
Yes, this is the most direct way to fix this problem.
But I don't think it's the best way since we will take care of a lot
of things and
it also involves in lots of changes to side effect processing.
I prefer to Neil Horman's way for the solution since only COOKIE_ACK chunk is
allowed to place ahead of SACK chunk when bundling into one packet.
What do you think?



Thanks,
Xufeng Zhang
>
> -vlad
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