ms: Store the NACK rate in the MS object

Currently the NACK/unconfirmed ratio is already passed to the
corresponding MS object, but the value is not being stored there.

This commit adds a member and a getter method and include the values
into the output of the 'show ms' command.

Sponsored-by: On-Waves ehf

src/gprs_ms.cpp

@@ -90,7 +90,8 @@ GprsMs::GprsMs(BTS *bts, uint32_t tlli) :
 	m_is_idle(true),
 	m_ref(0),
 	m_list(this),
-	m_delay(0)
+	m_delay(0),
+	m_nack_rate_dl(0)
 {
 	LOGP(DRLCMAC, LOGL_INFO, "Creating MS object, TLLI = 0x%08x\n", tlli);
 
@@ -383,6 +384,8 @@ void GprsMs::update_error_rate(gprs_rlcmac_tbf *tbf, int error_rate)
 	/* TODO: Check for TBF direction */
 	/* TODO: Support different CS values for UL and DL */
 
+	m_nack_rate_dl = error_rate;
+
 	if (error_rate > bts_data->cs_adj_upper_limit) {
 		if (m_current_cs_dl > 1) {
 			m_current_cs_dl -= 1;

src/gprs_ms.h

@@ -99,6 +99,7 @@ public:
 
 	void update_l1_meas(const pcu_l1_meas *meas);
 	const pcu_l1_meas* l1_meas() const {return &m_l1_meas;};
+	unsigned nack_rate_dl() const;
 
 	/* internal use */
 	static void timeout(void *priv_);
@@ -138,6 +139,7 @@ private:
 	int64_t m_last_cs_not_low;
 
 	pcu_l1_meas m_l1_meas;
+	unsigned m_nack_rate_dl;
 };
 
 inline uint32_t GprsMs::tlli() const
@@ -193,3 +195,8 @@ inline const gprs_llc_queue *GprsMs::llc_queue() const
 	return &m_llc_queue;
 }
 
+inline unsigned GprsMs::nack_rate_dl() const
+{
+	return m_nack_rate_dl;
+}
+

src/pcu_vty_functions.cpp

@@ -81,6 +81,9 @@ static int show_ms(struct vty *vty, GprsMs *ms)
 	if (ms->l1_meas()->have_bto)
 		vty_out(vty, "  Burst timing offset:    %d/4 bit%s",
 			ms->l1_meas()->bto, VTY_NEWLINE);
+	if (ms->l1_meas()->have_ms_rx_qual)
+		vty_out(vty, "  Downlink NACK rate:     %d %%%s",
+			ms->nack_rate_dl(), VTY_NEWLINE);
 	if (ms->l1_meas()->have_ms_rx_qual)
 		vty_out(vty, "  MS RX quality:          %d %%%s",
 			ms->l1_meas()->ms_rx_qual, VTY_NEWLINE);