[PATCH] osmo-bts[master]: Save seq. num. of RTP in Control Buffer

[Max]

Review at  https://gerrit.osmocom.org/1343

Save seq. num. of RTP in Control Buffer

Having this information is useful for debugging - save it alongside with
Marker bit from RTP header.

Change-Id: I359b3bcb74fbfc071547fe2f9d837829374fe997
---
M include/osmo-bts/msg_utils.h
M src/common/l1sap.c
2 files changed, 9 insertions(+), 1 deletion(-)


  git pull ssh://gerrit.osmocom.org:29418/osmo-bts refs/changes/43/1343/1

diff --git a/include/osmo-bts/msg_utils.h b/include/osmo-bts/msg_utils.h
index 4f9868c..dcc122f 100644
--- a/include/osmo-bts/msg_utils.h
+++ b/include/osmo-bts/msg_utils.h
@@ -16,6 +16,9 @@
 /* Access 1st byte of msgb control buffer */
 #define rtpmsg_marker_bit(x) ((x)->cb[0])
 
+/* Access 2nd and 3rd bytes of msgb control buffer as uint16_t */
+#define rtpmsg_seq(x) (&(x)->cb[1])
+
 /**
  * Classification of OML message. ETSI for plain GSM 12.21
  * messages and IPA/Osmo for manufacturer messages.
diff --git a/src/common/l1sap.c b/src/common/l1sap.c
index 553011f..b0475ed 100644
--- a/src/common/l1sap.c
+++ b/src/common/l1sap.c
@@ -662,6 +662,7 @@
 	struct gsm_time g_time;
 	struct gsm_lchan *lchan;
 	uint8_t chan_nr, marker = 0;
+	uint16_t seq;
 	uint32_t fn;
 
 	chan_nr = rts_ind->chan_nr;
@@ -695,6 +696,8 @@
 	} else {
 		/* Obtain RTP header Marker bit from control buffer */
 		marker = rtpmsg_marker_bit(resp_msg);
+		/* Obtain RTP header Sequence Number from control buffer */
+		seq = osmo_load16le(rtpmsg_seq(resp_msg));
 
 		resp_msg->l2h = resp_msg->data;
 		msgb_push(resp_msg, sizeof(*resp_l1sap));
@@ -1075,8 +1078,10 @@
 
 	/* Store RTP header Marker bit in control buffer */
 	rtpmsg_marker_bit(msg) = marker;
+	/* Store RTP header Sequence Number in control buffer */
+	osmo_store16le(seq_number, rtpmsg_seq(msg));
 
-	 /* make sure the queue doesn't get too long */
+	/* make sure the queue doesn't get too long */
 	llist_for_each_entry(tmp, &lchan->dl_tch_queue, list)
 	count++;
 	while (count >= 2) {

-- 
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Gerrit-MessageType: newchange
Gerrit-Change-Id: I359b3bcb74fbfc071547fe2f9d837829374fe997
Gerrit-PatchSet: 1
Gerrit-Project: osmo-bts
Gerrit-Branch: master
Gerrit-Owner: Max <msuraev at sysmocom.de>