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sctp: only update outstanding_bytes for transmitted queue when doing prsctp_prune 

Now outstanding_bytes is only increased when appending chunks into one
packet and sending it at 1st time, while decreased when it is about to
move into retransmit queue. It means outstanding_bytes value is already
decreased for all chunks in retransmit queue.

However sctp_prsctp_prune_sent is a common function to check the chunks
in both transmitted and retransmit queue, it decrease outstanding_bytes
when moving a chunk into abandoned queue from either of them.

It could cause outstanding_bytes underflow, as it also decreases it's
value for the chunks in retransmit queue.

This patch fixes it by only updating outstanding_bytes for transmitted
queue when pruning queues for prsctp prio policy, the same fix is also
needed in sctp_check_transmitted.

Fixes: 8dbdf1f5b0 ("sctp: implement prsctp PRIO policy")
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 2017-11-25 21:18:34 +08:00 committed by David S. Miller
parent 6fef90c6b3
commit d30fc5126e
1 changed files with 4 additions and 2 deletions
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6
net/sctp/outqueue.c
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@ -377,7 +377,8 @@ static int sctp_prsctp_prune_sent(struct sctp_association *asoc,
asoc->abandoned_sent[SCTP_PR_INDEX(PRIO)]++;
streamout->ext->abandoned_sent[SCTP_PR_INDEX(PRIO)]++;
if (!chk->tsn_gap_acked) {
if (queue != &asoc->outqueue.retransmit &&
!chk->tsn_gap_acked) {
if (chk->transport)
chk->transport->flight_size -=
sctp_data_size(chk);
@ -1434,7 +1435,8 @@ static void sctp_check_transmitted(struct sctp_outq *q,
/* If this chunk has not been acked, stop
* considering it as 'outstanding'.
*/
if (!tchunk->tsn_gap_acked) {
if (transmitted_queue != &q->retransmit &&
!tchunk->tsn_gap_acked) {
if (tchunk->transport)
tchunk->transport->flight_size -=
sctp_data_size(tchunk);