netdev - Re: [PATCH v2 4/4] sctp: fix association hangs due to partial delivery errors

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Date:	Thu, 28 Feb 2013 09:34:26 -0500
From:	Neil Horman <nhorman@...driver.com>
To:	"Lee A. Roberts" <lee.roberts@...com>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH v2 4/4] sctp: fix association hangs due to partial
 delivery errors

On Wed, Feb 27, 2013 at 11:54:33AM -0700, Lee A. Roberts wrote:
> From: "Lee A. Roberts" <lee.roberts@...com>
> 
> Resolve SCTP association hangs observed during SCTP stress
> testing.  Observable symptoms include communications hangs
> with data being held in the association reassembly and/or lobby
> (ordering) queues.  Close examination of reassembly queue shows
> missing packets.
> 
> In sctp_ulpq_tail_data(), use return values 0,1 to indicate whether
> a complete event (with MSG_EOR set) was delivered.  A return value
> of -ENOMEM continues to indicate an out-of-memory condition was
> encountered.
> 
> In sctp_ulpq_retrieve_partial() and sctp_ulpq_retrieve_first(),
> correct message reassembly logic for SCTP partial delivery.
> Change logic to ensure that as much data as possible is sent
> with the initial partial delivery and that following partial
> deliveries contain all available data.
> 
> In sctp_ulpq_partial_delivery(), attempt partial delivery only
> if the data on the head of the reassembly queue is at or before
> the cumulative TSN ACK point.
> 
> In sctp_ulpq_renege(), use the modified return values from
> sctp_ulpq_tail_data() to choose whether to attempt partial
> delivery or to attempt to drain the reassembly queue as a
> means to reduce memory pressure.  Remove call to
> sctp_tsnmap_mark(), as this is handled correctly in call to
> sctp_ulpq_tail_data().
> 
> Signed-off-by: Lee A. Roberts <lee.roberts@...com>
Acked-by: Neil Horman <nhorman@...driver.com>
> 
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