power_control: add CTRL command for sending default params

There exists a VTY command for sending default power control params,
but so far there was no CTRL counterpart for it.  This patch adds a
SET command 'send-power-control-defaults':

  $ osmo_ctrl.py \
	--host 127.0.0.1 -p 4249 \
	--set "bts.0.send-power-control-defaults" 1

Similar to 'send-new-system-informations', this command takes an
arbitrary dummy value (required for SET), which is simply ignored.

Change-Id: Ib370bd97ee2d9f72f8bec553550b1792d1345387
Related: SYS#6138

doc/manuals/chapters/control.adoc

@@ -33,6 +33,7 @@ TRX-specific commands are additionally prefixed with TRX number e. g.
 |bts.N.cell-identity|RW|No|"<id>"|Set/Get Cell Identity (value between (0, 65535)).
 |bts.N.apply-configuration|WO|No|Ignored|Restart BTS via OML.
 |bts.N.send-new-system-informations|WO|No|Ignored|Regenerate and resend System Information messages for given BTS.
+|bts.N.send-power-control-defaults|WO|No|Ignored|Resend default power control parameters for given BTS.
 |bts.N.channel-load|RO|No|"<name>,<used>,<total>"|See <<chanlo>> for details.
 |bts.N.oml-connection-state|RO|No|"connected", "disconnected", "degraded"|Indicate the status of OML connection of BTS.
 |bts.N.oml-uptime|RO|No|<uptime>|Return OML link uptime in seconds.

doc/manuals/chapters/power_control.adoc

@@ -53,13 +53,24 @@ BTS that accepts the default parameters at startup without triggering the A-bis/
 link re-establishment and thus interrupting the service.  The following command
 triggers resending of both MS/BS power control parameters:
 
+.Example: Resending default power control parameters via the VTY
 ----
 # Resending from the 'enable' node:
-OsmoBSC# bts 0 resend-power-control-defaults
+OsmoBSC# bts 0 <1> resend-power-control-defaults
 
 # Resending from any configuration node (note prefix 'do'):
-OsmoBSC(config-ms-power-ctrl)# do bts 0 resend-power-control-defaults
+OsmoBSC(config-ms-power-ctrl)# do bts 0 <1> resend-power-control-defaults
 ----
+<1> BTS number for which to resend default power control parameters.
+
+.Example: Resending default power control parameters via the CTRL
+----
+$ osmo_ctrl.py \
+	--host 127.0.0.1 <1> -p 4249 \
+	--set "bts.0.send-power-control-defaults" 1 <2>
+----
+<1> Remote address of the host running osmo-bsc (localhost in this example).
+<2> An arbitrary dummy value (ignored).  Required because SET command is used.
 
 NOTE: The above statement mostly applies to parameters for dynamic power control
 mode (see below).  Switching between power control modes, as well as changing

src/osmo-bsc/bsc_ctrl_commands.c

@@ -290,6 +290,33 @@ static int set_bts_si(struct ctrl_cmd *cmd, void *data)
 }
 CTRL_CMD_DEFINE_WO_NOVRF(bts_si, "send-new-system-informations");
 
+static int set_bts_power_ctrl_defs(struct ctrl_cmd *cmd, void *data)
+{
+	const struct gsm_bts *bts = cmd->node;
+	const struct gsm_bts_trx *trx;
+
+	if (bts->ms_power_ctrl.mode != GSM_PWR_CTRL_MODE_DYN_BTS) {
+		cmd->reply = "BTS is not using dyn-bts mode";
+		return CTRL_CMD_ERROR;
+	}
+
+	if (bts->model->power_ctrl_send_def_params == NULL) {
+		cmd->reply = "Not implemented for this BTS model";
+		return CTRL_CMD_ERROR;
+	}
+
+	llist_for_each_entry(trx, &bts->trx_list, list) {
+		if (bts->model->power_ctrl_send_def_params(trx) != 0) {
+			cmd->reply = "power_ctrl_send_def_params() failed";
+			return CTRL_CMD_ERROR;
+		}
+	}
+
+	cmd->reply = "Default power control parameters have been sent";
+	return CTRL_CMD_REPLY;
+}
+CTRL_CMD_DEFINE_WO_NOVRF(bts_power_ctrl_defs, "send-power-control-defaults");
+
 static int get_bts_chan_load(struct ctrl_cmd *cmd, void *data)
 {
 	int i;
@@ -799,6 +826,7 @@ int bsc_base_ctrl_cmds_install(void)
 	rc |= ctrl_cmd_install(CTRL_NODE_BTS, &cmd_bts_ci);
 	rc |= ctrl_cmd_install(CTRL_NODE_BTS, &cmd_bts_apply_config);
 	rc |= ctrl_cmd_install(CTRL_NODE_BTS, &cmd_bts_si);
+	rc |= ctrl_cmd_install(CTRL_NODE_BTS, &cmd_bts_power_ctrl_defs);
 	rc |= ctrl_cmd_install(CTRL_NODE_BTS, &cmd_bts_chan_load);
 	rc |= ctrl_cmd_install(CTRL_NODE_BTS, &cmd_bts_oml_conn);
 	rc |= ctrl_cmd_install(CTRL_NODE_BTS, &cmd_bts_oml_up);