linux-kernel - Re: [PATCH] net: sctp: find the correct highest_new

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Message-Id: <20131123.144657.1317547893471212174.davem@davemloft.net>
Date:	Sat, 23 Nov 2013 14:46:57 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	vyasevich@...il.com
Cc:	changxiangzhong@...il.com, nhorman@...driver.com,
	linux-sctp@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: sctp: find the correct highest_new_tsn in sack

From: Vlad Yasevich <vyasevich@...il.com>
Date: Thu, 21 Nov 2013 17:14:01 -0500

> On 11/21/2013 04:56 PM, Chang Xiangzhong wrote:
>> Function sctp_check_transmitted(transport t, ...) would iterate all of
>> transport->transmitted queue and looking for the highest __newly__ acked tsn.
>> The original algorithm would depend on the order of the assoc->transport_list
>> (in function sctp_outq_sack line 1215 - 1226). The result might not be the
>> expected due to the order of the tranport_list.
>> 
>> Solution: checking if the exising is smaller than the new one before assigning
>> 
>> Signed-off-by: Chang Xiangzhong <changxiangzhong@...il.com>
> 
> Good find.  This has been around for since day 1.  It doesn't so much
> depend on the order of the transport list, but on the order the
> transports been used.  I agree it is a problem if chunks have been
> distributed across multiple transports and a singe SACK acking them all.
> 
> Acked-by: Vlad Yasevich <vyasevich@...il.com>

Applied, thanks.
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