Pau Espin Pedrol has submitted this change and it was merged. ( 
https://gerrit.osmocom.org/9172 )

Change subject: jibuf: Fix out-of-order seq queue around syncpoints
......................................................................

jibuf: Fix out-of-order seq queue around syncpoints

Fixes: OS#3262

Change-Id: Ib8c61dbe6261cf73d6efcd7873e23b7656117556
---
M src/jibuf.c
M tests/jibuf/jibuf_test.c
M tests/jibuf/jibuf_test.ok
3 files changed, 36 insertions(+), 7 deletions(-)

Approvals:
  Jenkins Builder: Verified
  Harald Welte: Looks good to me, approved



diff --git a/src/jibuf.c b/src/jibuf.c
index 45019ae..2632a57 100644
--- a/src/jibuf.c
+++ b/src/jibuf.c
@@ -119,6 +119,35 @@

 }

+static void enqueue_pkt(struct osmo_jibuf *jb, struct msgb  *msg, bool 
is_syncpoint)
+{
+       struct msgb *cur;
+       struct timeval *msg_ts;
+
+       if (!is_syncpoint) {
+               llist_add_sorted(msg, &jb->msg_list);
+               return;
+       }
+
+       /* syncpoints change the reference timings, and as such they can provoke
+          out of order enqueuing of this packet and its followups with regards
+          to the already stored packets which may be scheduled for later times.
+          We thus need to adapt dequeue time for the already stored pkts to be
+          dequeued before the syncpoint pkt. See OS#3262 for related scenarios.
+       */
+
+       msg_ts = msgb_scheduled_ts(msg);
+
+       llist_for_each_entry(cur, &jb->msg_list, list) {
+               struct timeval *cur_ts = msgb_scheduled_ts(cur);
+               if (timercmp(msg_ts, cur_ts, <))
+                       *cur_ts = *msg_ts;
+       }
+       /* syncpoint goes always to the end since we moved all older packets
+          before it */
+       llist_add_tail(&msg->list, &jb->msg_list);
+}
+
 static bool msg_get_marker(struct msgb *msg)
 {
        /* TODO: make it more generic as a callback so that different types of
@@ -314,11 +343,13 @@
 {
        int rel_delay, delay;
        struct timeval delay_ts, sched_ts;
+       bool is_syncpoint;

        clock_gettime_timeval(CLOCK_MONOTONIC, &jb->last_enqueue_time);

        /* Check if it's time to sync, ie. start of talkspurt */
-       if (!jb->started || msg_is_syncpoint(jb, msg)) {
+       is_syncpoint = !jb->started || msg_is_syncpoint(jb, msg);
+       if (is_syncpoint) {
                jb->started = true;
                msg_set_as_reference(jb, msg);
                rel_delay = 0;
@@ -365,8 +396,7 @@
        jbcb->ts = sched_ts;
        jbcb->old_cb = old_cb;

-       llist_add_sorted(msg, &jb->msg_list);
-
+       enqueue_pkt(jb, msg, is_syncpoint);

        /* See if updating the timer is needed: */
        if (!osmo_timer_pending(&jb->timer) ||
diff --git a/tests/jibuf/jibuf_test.c b/tests/jibuf/jibuf_test.c
index 7993a65..ba1bb01 100644
--- a/tests/jibuf/jibuf_test.c
+++ b/tests/jibuf/jibuf_test.c
@@ -673,8 +673,7 @@
        clock_override_add(0, min_delay*1000);
        osmo_select_main(0);

-       /* This assert shows that packets are queued out of order in this 
case:*/
-       OSMO_ASSERT(!osmo_jibuf_empty(jb));
+       OSMO_ASSERT(osmo_jibuf_empty(jb));

        osmo_jibuf_delete(jb);
 }
diff --git a/tests/jibuf/jibuf_test.ok b/tests/jibuf/jibuf_test.ok
index 6bf52fb..b92f73c 100644
--- a/tests/jibuf/jibuf_test.ok
+++ b/tests/jibuf/jibuf_test.ok
@@ -383,10 +383,10 @@
 sys={0.140000}, mono={0.140000}: dequeue: seq=34 ts=720 INTERMEDIATE
 sys={0.140000}, mono={0.140000}: dequeue: seq=35 ts=880 INTERMEDIATE
 sys={0.140000}, mono={0.140000}: dequeue: seq=36 ts=1040 INTERMEDIATE
-sys={0.140000}, mono={0.140000}: dequeue: seq=39 ts=1520 INTERMEDIATE
 sys={0.140000}, mono={0.140000}: dequeue: seq=37 ts=1200 INTERMEDIATE
-sys={0.140000}, mono={0.140000}: dequeue: seq=40 ts=1680 LATEST
 sys={0.140000}, mono={0.140000}: dequeue: seq=38 ts=1360 INTERMEDIATE
+sys={0.140000}, mono={0.140000}: dequeue: seq=39 ts=1520 INTERMEDIATE
+sys={0.140000}, mono={0.140000}: dequeue: seq=40 ts=1680 LATEST
 ===test_rtp_out_of_sync(1600, 5, 800, 1)===
 sys={0.000000}, mono={0.000000}: clock_override_set
 sys={0.000000}, mono={0.000000}: enqueue 1st packet (seq=33, ts=560)

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Gerrit-Project: libosmo-netif
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: Ib8c61dbe6261cf73d6efcd7873e23b7656117556
Gerrit-Change-Number: 9172
Gerrit-PatchSet: 1
Gerrit-Owner: Pau Espin Pedrol <pes...@sysmocom.de>
Gerrit-Reviewer: Harald Welte <lafo...@gnumonks.org>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: Pau Espin Pedrol <pes...@sysmocom.de>

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