netdev - Re: [PATCH net] sctp: use new rhlist interface on sctp transport rhashtable

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Date:   Wed, 16 Nov 2016 23:22:36 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     lucien.xin@...il.com
Cc:     netdev@...r.kernel.org, linux-sctp@...r.kernel.org,
        marcelo.leitner@...il.com, nhorman@...driver.com,
        vyasevich@...il.com, herbert@...dor.apana.org.au, phil@....cc
Subject: Re: [PATCH net] sctp: use new rhlist interface on sctp transport
 rhashtable

From: Xin Long <lucien.xin@...il.com>
Date: Tue, 15 Nov 2016 23:23:11 +0800

> Now sctp transport rhashtable uses hash(lport, dport, daddr) as the key
> to hash a node to one chain. If in one host thousands of assocs connect
> to one server with the same lport and different laddrs (although it's
> not a normal case), all the transports would be hashed into the same
> chain.
> 
> It may cause to keep returning -EBUSY when inserting a new node, as the
> chain is too long and sctp inserts a transport node in a loop, which
> could even lead to system hangs there.
> 
> The new rhlist interface works for this case that there are many nodes
> with the same key in one chain. It puts them into a list then makes this
> list be as a node of the chain.
> 
> This patch is to replace rhashtable_ interface with rhltable_ interface.
> Since a chain would not be too long and it would not return -EBUSY with
> this fix when inserting a node, the reinsert loop is also removed here.
> 
> Signed-off-by: Xin Long <lucien.xin@...il.com>

Applied to net-next, thanks.