netdev - [PATCH v2 2/4] sctp: fix association hangs due to reneging packets below the cumulative TSN ACK point

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Message-Id: <1361991273-30578-3-git-send-email-lee.roberts@hp.com>
Date:	Wed, 27 Feb 2013 11:54:31 -0700
From:	"Lee A. Roberts" <lee.roberts@...com>
To:	netdev@...r.kernel.org
Cc:	lee.roberts@...com
Subject: [PATCH v2 2/4] sctp: fix association hangs due to reneging packets below the cumulative TSN ACK point

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_renege_list(), do not renege packets below the
cumulative TSN ACK point.

Signed-off-by: Lee A. Roberts <lee.roberts@...com>
---
 net/sctp/ulpqueue.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/net/sctp/ulpqueue.c b/net/sctp/ulpqueue.c
index ada1746..63afddc 100644
--- a/net/sctp/ulpqueue.c
+++ b/net/sctp/ulpqueue.c
@@ -969,11 +969,16 @@ static __u16 sctp_ulpq_renege_list(struct sctp_ulpq *ulpq,

 	tsnmap = &ulpq->asoc->peer.tsn_map;

-	while ((skb = __skb_dequeue_tail(list)) != NULL) {
-		freed += skb_headlen(skb);
+	while ((skb = skb_peek_tail(list)) != NULL) {
 		event = sctp_skb2event(skb);
 		tsn = event->tsn;

+		/* Don't renege below the Cumulative TSN ACK Point. */
+		if (TSN_lte(tsn, sctp_tsnmap_get_ctsn(tsnmap)))
+			break;
+
+		__skb_unlink(skb, list);
+		freed += skb_headlen(skb);
 		sctp_ulpevent_free(event);
 		sctp_tsnmap_renege(tsnmap, tsn);
 		if (freed >= needed)
-- 
1.7.9.5

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