Now sctp uses chunk->resent to record if a chunk is retransmitted, for
RTT measurements with retransmitted DATA chunks. chunk->sent_count was
introduced to record how many times one chunk has been sent for prsctp
RTX policy before. We actually can know if one chunk is retransmitted
by checking chunk->sent_count is greater than 1.
This patch is to remove resent from sctp_chunk and reuse sent_count
to avoid retransmitted chunks for RTT measurements.
Signed-off-by: Xin Long <lucien.xin@xxxxxxxxx>
---
include/net/sctp/structs.h | 1 -
net/sctp/output.c | 3 ++-
net/sctp/outqueue.c | 4 +---
3 files changed, 3 insertions(+), 5 deletions(-)
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index 4f097f5..81a5faa 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -647,7 +647,6 @@ struct sctp_chunk {
#define SCTP_NEED_FRTX 0x1
#define SCTP_DONT_FRTX 0x2
__u16 rtt_in_progress:1, /* This chunk used for RTT calc? */
- resent:1, /* Has this chunk ever been resent. */
has_tsn:1, /* Does this chunk have a TSN yet? */
has_ssn:1, /* Does this chunk have a SSN yet? */
singleton:1, /* Only chunk in the packet? */
diff --git a/net/sctp/output.c b/net/sctp/output.c
index 31b7bc3..483d2ed 100644
--- a/net/sctp/output.c
+++ b/net/sctp/output.c
@@ -547,7 +547,8 @@ int sctp_packet_transmit(struct sctp_packet *packet, gfp_t gfp)
* for a given destination transport address.
*/
- if (!chunk->resent && !tp->rto_pending) {
+ if (chunk->sent_count == 1 &&
+ !tp->rto_pending) {
chunk->rtt_in_progress = 1;
tp->rto_pending = 1;
}
diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c
index 72e54a4..2a629fa 100644
--- a/net/sctp/outqueue.c
+++ b/net/sctp/outqueue.c
@@ -536,8 +536,6 @@ void sctp_retransmit_mark(struct sctp_outq *q,
transport->rto_pending = 0;
}
- chunk->resent = 1;
-
/* Move the chunk to the retransmit queue. The chunks
* on the retransmit queue are always kept in order.
*/
@@ -1467,7 +1465,7 @@ static void sctp_check_transmitted(struct sctp_outq *q,
* instance).
*/
if (!tchunk->tsn_gap_acked &&
- !tchunk->resent &&
+ tchunk->sent_count == 1 &&
tchunk->rtt_in_progress) {
tchunk->rtt_in_progress = 0;
rtt = jiffies - tchunk->sent_at;
--
2.1.0
--
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