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sctp: reuse sent_count to avoid retransmitted chunks for RTT measurements

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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@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2016-10-08 11:36:05 +08:00 • committed by David S. Miller
parent 0f505b1ae6
commit cc6ac9bccf
3 changed files with 4 additions and 5 deletions
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4
net/sctp/outqueue.c
View file

@ -507,8 +507,6 @@ 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.
*/
@ -1439,7 +1437,7 @@ static void sctp_check_transmitted(struct sctp_outq *q,
* instance).
*/
if (!tchunk->tsn_gap_acked &&
!tchunk->resent &&
!sctp_chunk_retransmitted(tchunk) &&
tchunk->rtt_in_progress) {
tchunk->rtt_in_progress = 0;
rtt = jiffies - tchunk->sent_at;