ms: Replace struct var with rate_ctr

Let's use usual osmocom rate_ctr instead of having one variable +
setter/getter functions, so we can easily add new counters and also
because it makes code more clear (no need to look at what the "update"
function is doing).

Using rate counter also provides info about how recently the MS has been
interacting with the network.

Related: OS#4907
Change-Id: I744507fde4291955c1dbbb9739b18a12a80145b1

src/gprs_ms.c

@@ -35,11 +35,25 @@
 #include <osmocom/gsm/protocol/gsm_04_08.h>
 #include <osmocom/gsm/gsm48.h>
 #include <osmocom/core/logging.h>
+#include <osmocom/core/stats.h>
 #include "coding_scheme.h"
 
 #define GPRS_CODEL_SLOW_INTERVAL_MS 4000
 
 extern void *tall_pcu_ctx;
+static unsigned int next_ms_ctr_group_id;
+
+static const struct rate_ctr_desc ms_ctr_description[] = {
+	[MS_CTR_DL_CTRL_MSG_SCHED] = { "ms:dl_ctrl_msg_sched", "Amount of DL CTRL messages scheduled" },
+};
+
+const struct rate_ctr_group_desc ms_ctrg_desc = {
+	.group_name_prefix = "pcu:ms",
+	.group_description = "MS Statistics",
+	.class_id = OSMO_STATS_CLASS_SUBSCRIBER,
+	.num_ctr = ARRAY_SIZE(ms_ctr_description),
+	.ctr_desc = ms_ctr_description,
+};
 
 static int64_t now_msec()
 {
@@ -118,7 +132,15 @@ struct GprsMs *ms_alloc(struct BTS *bts, uint32_t tlli)
 	}
 	ms->last_cs_not_low = now_msec();
 	ms->app_info_pending = false;
+
+	ms->ctrs = rate_ctr_group_alloc(ms, &ms_ctrg_desc, next_ms_ctr_group_id++);
+	if (!ms->ctrs)
+		goto free_ret;
+
 	return ms;
+free_ret:
+	talloc_free(ms);
+	return NULL;
 }
 
 static int ms_talloc_destructor(struct GprsMs *ms)
@@ -148,6 +170,9 @@ static int ms_talloc_destructor(struct GprsMs *ms)
 	}
 
 	llc_queue_clear(&ms->llc_queue, ms->bts);
+
+	if (ms->ctrs)
+		rate_ctr_group_free(ms->ctrs);
 	return 0;
 }
 

src/gprs_ms.h

@@ -34,6 +34,7 @@ extern "C" {
 
 #include <osmocom/core/timer.h>
 #include <osmocom/core/linuxlist.h>
+#include <osmocom/core/rate_ctr.h>
 
 #include <osmocom/gsm/protocol/gsm_23_003.h>
 #include <osmocom/gsm/gsm48.h>
@@ -44,6 +45,10 @@ extern "C" {
 #include <stddef.h>
 #include <inttypes.h>
 
+enum ms_counter_id {
+	MS_CTR_DL_CTRL_MSG_SCHED,
+};
+
 struct BTS;
 struct gprs_rlcmac_trx;
 struct GprsMs;
@@ -94,7 +99,7 @@ struct GprsMs {
 	struct gprs_codel *codel_state;
 	enum mcs_kind mode;
 
-	unsigned dl_ctrl_msg;
+	struct rate_ctr_group *ctrs;
 };
 
 struct GprsMs *ms_alloc(struct BTS *bts, uint32_t tlli);
@@ -215,16 +220,6 @@ static inline unsigned ms_nack_rate_dl(const struct GprsMs *ms)
 	return ms->nack_rate_dl;
 }
 
-static inline unsigned ms_dl_ctrl_msg(const struct GprsMs *ms)
-{
-	return ms->dl_ctrl_msg;
-}
-
-static inline void ms_update_dl_ctrl_msg(struct GprsMs *ms)
-{
-	ms->dl_ctrl_msg++;
-}
-
 static inline uint8_t ms_reserved_dl_slots(const struct GprsMs *ms)
 {
 	return ms->reserved_dl_slots;

src/gprs_rlcmac_sched.cpp

@@ -233,8 +233,7 @@ static struct msgb *sched_select_ctrl_msg(
 		LOGP(DRLCMACSCHED, LOGL_DEBUG, "Scheduling control "
 			"message at RTS for %s (TRX=%d, TS=%d)\n",
 			tbf_name(tbf), trx, ts);
-		/* Updates the dl ctrl msg counter for ms */
-		ms_update_dl_ctrl_msg(tbf->ms());
+		rate_ctr_inc(&tbf->ms()->ctrs->ctr[MS_CTR_DL_CTRL_MSG_SCHED]);
 		return msg;
 	}
 

src/pcu_vty_functions.cpp

@@ -175,8 +175,6 @@ static int show_ms(struct vty *vty, GprsMs *ms)
 			vty_out(vty, "  MS I level (slot %d):    %d dB%s",
 				i, ms->l1_meas.ts[i].ms_i_level, VTY_NEWLINE);
 	}
-	vty_out(vty, "  RLC/MAC DL Control Msg: %d%s", ms_dl_ctrl_msg(ms),
-		VTY_NEWLINE);
 	if (ms_ul_tbf(ms))
 		vty_out(vty, "  Uplink TBF:             TFI=%d, state=%s%s",
 			ms_ul_tbf(ms)->tfi(),
@@ -201,6 +199,7 @@ static int show_ms(struct vty *vty, GprsMs *ms)
 			tbf->state_name(),
 			VTY_NEWLINE);
 	}
+	vty_out_rate_ctr_group(vty, "  ", ms->ctrs);
 
 	return CMD_SUCCESS;
 }