dyn TS: common TCH/F_TCH/H_PDCH implementation

common/l1sap: For dyn TS, the BSC will issue RSL Chan Activ requests with a
non-standard chan_nr. While the rest of the code now understands that, the L1
phy will not. Translate to standard PDCH (== TCH/F).

common/oml: use dyn TS' current pchan mode for lchans config.

common/pcu_sock: detect desired PDCH mode of dyn TS.

common/rsl: implement reconnection chain of a TS for changing its pchan:

* rsl_rx_chan_activ():
** Add dyn_pchan_from_chan_nr() to derive the requested pchan from the RSL
   chan_nr IE.
** Notice the need for a pchan change and invoke dyn_ts_l1_reconnect() (s.b.)
** Make Chan Mode IE presence optional, because the non-standard PDCH
   activation message is simpler and does not require it.
** Do PDCH activation via PCU.

* Add dyn_ts_l1_reconnect(): store state and disconnect the L1 channel;
  then wait for cb_ts_disconnected().

* Add osmo_dyn_ts_disconnected() to cb_ts_disconnected():
  verify state and connect with the new pchan type; then wait for
  cb_ts_connected().

* Add osmo_dyn_ts_connected() to cb_ts_connected(), which re-issues
  the cached chan activation message from before disconnecting the L1 channel.

* Also send an rf chan rel/act ack for dyn TS upon PDCH de/act via PCU.

* Add dyn_ts_pdch_release(): on channel release of a dyn TS in PDCH mode,
  release via the PCU. Call from rsl_rx_rd_chan_rel().

Change-Id: I463bb6b4e57674f091c3badba9257374961c52c7

1 files changed, 9 insertions, 0 deletions

diff --git a/src/common/oml.c b/src/common/oml.c
index 89708583..690a81d9 100644
--- a/src/common/oml.c
+++ b/src/common/oml.c
@@ -694,6 +694,15 @@ static int conf_lchans(struct gsm_bts_trx_ts *ts)
 		pchan = ts->flags & TS_F_PDCH_ACTIVE? GSM_PCHAN_PDCH
 						    : GSM_PCHAN_TCH_F;
 
+	/* Osmocom RSL CHAN ACT style dyn TS */
+	if (pchan == GSM_PCHAN_TCH_F_TCH_H_PDCH) {
+		pchan = ts->dyn.pchan_is;
+
+		/* If the dyn TS doesn't have a pchan yet, do nothing. */
+		if (pchan == GSM_PCHAN_NONE)
+			return 0;
+	}
+
 	return conf_lchans_as_pchan(ts, pchan);
 }