sctp: add SCTP_PR_STREAM_STATUS sockopt for prsctp

Before when implementing sctp prsctp, SCTP_PR_STREAM_STATUS wasn't
added, as it needs to save abandoned_(un)sent for every stream.

After sctp stream reconf is added in sctp, assoc has structure
sctp_stream_out to save per stream info.

This patch is to add SCTP_PR_STREAM_STATUS by putting the prsctp
per stream statistics into sctp_stream_out.

v1->v2:
  fix an indent issue.

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>

1 files changed, 10 insertions, 0 deletions

diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c
index 025ccff67072..3f78d7f06e14 100644
--- a/net/sctp/outqueue.c
+++ b/net/sctp/outqueue.c
@@ -353,6 +353,8 @@ static int sctp_prsctp_prune_sent(struct sctp_association *asoc,
         struct sctp_chunk *chk, *temp;
 
         list_for_each_entry_safe(chk, temp, queue, transmitted_list) {
+                struct sctp_stream_out *streamout;
+
                 if (!SCTP_PR_PRIO_ENABLED(chk->sinfo.sinfo_flags) ||
                     chk->sinfo.sinfo_timetolive <= sinfo->sinfo_timetolive)
                         continue;
@@ -361,8 +363,10 @@ static int sctp_prsctp_prune_sent(struct sctp_association *asoc,
                 sctp_insert_list(&asoc->outqueue.abandoned,
                                  &chk->transmitted_list);
 
+                streamout = &asoc->stream->out[chk->sinfo.sinfo_stream];
                 asoc->sent_cnt_removable--;
                 asoc->abandoned_sent[SCTP_PR_INDEX(PRIO)]++;
+                streamout->abandoned_sent[SCTP_PR_INDEX(PRIO)]++;
 
                 if (!chk->tsn_gap_acked) {
                         if (chk->transport)
@@ -396,6 +400,12 @@ static int sctp_prsctp_prune_unsent(struct sctp_association *asoc,
                 q->out_qlen -= chk->skb->len;
                 asoc->sent_cnt_removable--;
                 asoc->abandoned_unsent[SCTP_PR_INDEX(PRIO)]++;
+                if (chk->sinfo.sinfo_stream < asoc->stream->outcnt) {
+                        struct sctp_stream_out *streamout =
+                                &asoc->stream->out[chk->sinfo.sinfo_stream];
+
+                        streamout->abandoned_unsent[SCTP_PR_INDEX(PRIO)]++;
+                }
 
                 msg_len -= SCTP_DATA_SNDSIZE(chk) +
                            sizeof(struct sk_buff) +