pcu_sock: transfer E1 connection information to PCU

The BSC has all information about the E1 line configuration of each
timeslot/channel. The PCU is responsible for opening and managing the
CCU connection. To enable the CCU to do that, we have to transfer the E1
connection information (which TS, SS, rate) to the PCU.

Change-Id: I6d44373336b41009ff4c6e459d32d0a81081676c
Related: OS#5198

1 files changed, 70 insertions, 1 deletions

diff --git a/src/osmo-bsc/pcu_sock.c b/src/osmo-bsc/pcu_sock.c
index 8c0f73888..f6148b4ab 100644
--- a/src/osmo-bsc/pcu_sock.c
+++ b/src/osmo-bsc/pcu_sock.c
@@ -106,6 +106,19 @@ static bool ts_now_usable_as_pdch(const struct gsm_bts_trx_ts *ts)
 	}
 }
 
+/* Check if it is possible to use the TS as PDCH (not now, but maybe later) */
+static bool ts_usable_as_pdch(const struct gsm_bts_trx_ts *ts)
+{
+	switch (ts->pchan_from_config) {
+	case GSM_PCHAN_TCH_F_PDCH:
+	case GSM_PCHAN_OSMO_DYN:
+	case GSM_PCHAN_PDCH:
+		return true;
+	default:
+		return false;
+	}
+}
+
 /* Fill the frequency hopping parameter */
 static void info_ind_fill_fhp(struct gsm_pcu_if_info_trx_ts *ts_info,
 			      const struct gsm_bts_trx_ts *ts)
@@ -291,11 +304,67 @@ static int pcu_tx_info_ind(struct gsm_bts *bts)
 	return pcu_sock_send(bts, msg);
 }
 
+static int pcu_tx_e1_ccu_ind(struct gsm_bts *bts)
+{
+	struct gsm_bts_trx *trx;
+
+	llist_for_each_entry(trx, &bts->trx_list, list) {
+		struct gsm_pcu_if_e1_ccu_ind *e1_ccu_ind;
+		int i;
+
+		if (trx->nr >= PCU_IF_NUM_TRX) {
+			LOG_TRX(trx, DPCU, LOGL_NOTICE, "PCU interface (version %u) "
+				"cannot handle more than %u transceivers => skipped\n",
+				PCU_IF_VERSION, PCU_IF_NUM_TRX);
+			continue;
+		}
+
+		for (i = 0; i < ARRAY_SIZE(trx->ts); i++) {
+			struct gsm_pcu_if *pcu_prim;
+			struct gsm_bts_trx_ts *ts;
+			struct msgb *msg;
+			int rc;
+
+			ts = &trx->ts[i];
+
+			if (ts->mo.nm_state.operational != NM_OPSTATE_ENABLED)
+				continue;
+			if (!ts_usable_as_pdch(ts))
+				continue;
+
+			msg = pcu_msgb_alloc(PCU_IF_MSG_E1_CCU_IND, bts->nr);
+			if (!msg)
+				return -ENOMEM;
+			pcu_prim = (struct gsm_pcu_if *)msg->data;
+			e1_ccu_ind = &pcu_prim->u.e1_ccu_ind;
+			e1_ccu_ind->ts_nr = ts->nr;
+			e1_ccu_ind->trx_nr = trx->nr;
+			e1_ccu_ind->e1_nr = ts->e1_link.e1_nr;
+			e1_ccu_ind->e1_ts = ts->e1_link.e1_ts;
+			e1_ccu_ind->e1_ts_ss = ts->e1_link.e1_ts_ss;
+
+			LOG_TRX(trx, DPCU, LOGL_INFO, "Sending E1 CCU info for TS %d\n", e1_ccu_ind->ts_nr);
+			rc = pcu_sock_send(bts, msg);
+			if (rc < 0)
+				return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
 /* Allow test to overwrite it */
 __attribute__((weak)) void pcu_info_update(struct gsm_bts *bts)
 {
-	if (pcu_connected(bts))
+	if (pcu_connected(bts)) {
+		/* In cases where the CCU is connected via an E1 line, we transmit the connection parameters for the
+		 * PDCH before we announce the other BTS related parameters. At the moment Ericsson RBS is the only
+		 * E1 BTS we support. */
+		if (is_ericsson_bts(bts))
+			pcu_tx_e1_ccu_ind(bts);
+
 		pcu_tx_info_ind(bts);
+	}
 }
 
 static int pcu_tx_data_ind(struct gsm_bts_trx_ts *ts, uint8_t sapi, uint32_t fn,