netdev - Re: [Lksctp-developers] [RFC v3 PATCH 2/21] SCTP: Convert bind_addr

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Date:	Thu, 13 Sep 2007 12:56:25 -0700
From:	Sridhar Samudrala <sri@...ibm.com>
To:	Vlad Yasevich <vladislav.yasevich@...com>
Cc:	paulmck@...ux.vnet.ibm.com, netdev@...r.kernel.org,
	lksctp-developers@...ts.sourceforge.net
Subject: Re: [Lksctp-developers] [RFC v3 PATCH 2/21] SCTP:
	Convert	bind_addr_list locking to RCU

On Thu, 2007-09-13 at 15:33 -0400, Vlad Yasevich wrote:
> Hi Sridhar
> 
> Sridhar Samudrala wrote:
> > On Wed, 2007-09-12 at 15:33 -0700, Paul E. McKenney wrote:
> >> On Wed, Sep 12, 2007 at 05:03:42PM -0400, Vlad Yasevich wrote:
> >>> [... and here is the updated version as promissed ...]
> >>>
> >>> Since the sctp_sockaddr_entry is now RCU enabled as part of
> >>> the patch to synchronize sctp_localaddr_list, it makes sense to
> >>> change all handling of these entries to RCU.  This includes the
> >>> sctp_bind_addrs structure and it's list of bound addresses.
> >>>
> >>> This list is currently protected by an external rw_lock and that
> >>> looks like an overkill.  There are only 2 writers to the list:
> >>> bind()/bindx() calls, and BH processing of ASCONF-ACK chunks.
> >>> These are already seriealized via the socket lock, so they will
> >>> not step on each other.  These are also relatively rare, so we
> >>> should be good with RCU.
> >>>
> >>> The readers are varied and they are easily converted to RCU.
> >> Looks good from an RCU viewpoint -- I must defer to others on
> >> the networking aspects.
> >>
> >> Acked-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> > 
> > looks good to me too. some minor typos and some comments on
> > RCU usage comments inline.
> > 
> > Also, I guess we can remove the sctp_[read/write]_[un]lock macros
> > from sctp.h now that you removed the all the users of rwlocks
> > in SCTP
> > 
> 
> Looks like some of the hashing calls still use sctp_write_[un]lock
> macros, but use normal read_lock() for the read side.
> 
> I'll clean that up after these patches are accepted.

OK. You may also consider looking into the generic inet_hashtable
infrastructure and see if we can use it for SCTP.

Thanks
Sridhar

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