linux-kernel - [PATCH v3] net: sctp: fix a cacc_saw

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Date:	Wed, 16 Oct 2013 09:22:11 +0200
From:	Chang Xiangzhong <changxiangzhong@...il.com>
To:	vyasevich@...il.com
Cc:	nhorman@...driver.com, davem@...emloft.net,
	linux-sctp@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Chang Xiangzhong <changxiangzhong@...il.com>
Subject: [PATCH v3] net: sctp: fix a cacc_saw_newack missetting issue

For for each TSN t being newly acked (Not only cumulatively,
but also SELECTIVELY) cacc_saw_newack should be set to 1.

Signed-off-by: Xiangzhong Chang <changxiangzhong@...il.com>
---
 net/sctp/outqueue.c |   53 ++++++++++++++++++++++++---------------------------
 1 file changed, 25 insertions(+), 28 deletions(-)

diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c
index 94df758..da9a778 100644
--- a/net/sctp/outqueue.c
+++ b/net/sctp/outqueue.c
@@ -1383,19 +1383,38 @@ static void sctp_check_transmitted(struct sctp_outq *q,
 				}
 			}
 
-			/* If the chunk hasn't been marked as ACKED,
-			 * mark it and account bytes_acked if the
-			 * chunk had a valid transport (it will not
-			 * have a transport if ASCONF had deleted it
-			 * while DATA was outstanding).
-			 */
 			if (!tchunk->tsn_gap_acked) {
+				/* If the chunk hasn't been marked as ACKED,
+				 * mark it and account bytes_acked if the
+				 * chunk had a valid transport (it will not
+				 * have a transport if ASCONF had deleted it
+				 * while DATA was outstanding).
+				 */
 				tchunk->tsn_gap_acked = 1;
 				*highest_new_tsn_in_sack = tsn;
 				bytes_acked += sctp_data_size(tchunk);
 				if (!tchunk->transport)
 					migrate_bytes += sctp_data_size(tchunk);
 				forward_progress = true;
+
+				/*
+				 * SFR-CACC algorithm:
+				 * 2) If the SACK contains gap acks
+				 * and the flag CHANGEOVER_ACTIVE is
+				 * set the receiver of the SACK MUST
+				 * take the following action:
+				 *
+				 * B) For each TSN t being acked that
+				 * has not been acked in any SACK so
+				 * far, set cacc_saw_newack to 1 for
+				 * the destination that the TSN was
+				 * sent to.
+				 */
+				if (transport &&
+					sack->num_gap_ack_blocks &&
+					q->asoc->peer.primary_path->cacc.
+					changeover_active)
+					transport->cacc.cacc_saw_newack = 1;
 			}
 
 			if (TSN_lte(tsn, sack_ctsn)) {
@@ -1411,28 +1430,6 @@ static void sctp_check_transmitted(struct sctp_outq *q,
 				restart_timer = 1;
 				forward_progress = true;
 
-				if (!tchunk->tsn_gap_acked) {
-					/*
-					 * SFR-CACC algorithm:
-					 * 2) If the SACK contains gap acks
-					 * and the flag CHANGEOVER_ACTIVE is
-					 * set the receiver of the SACK MUST
-					 * take the following action:
-					 *
-					 * B) For each TSN t being acked that
-					 * has not been acked in any SACK so
-					 * far, set cacc_saw_newack to 1 for
-					 * the destination that the TSN was
-					 * sent to.
-					 */
-					if (transport &&
-					    sack->num_gap_ack_blocks &&
-					    q->asoc->peer.primary_path->cacc.
-					    changeover_active)
-						transport->cacc.cacc_saw_newack
-							= 1;
-				}
-
 				list_add_tail(&tchunk->transmitted_list,
 					      &q->sacked);
 			} else {
-- 
1.7.9.5

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