bts: Count TBF TS allocation failure

Related: OS#2282
Change-Id: I0696bf77364bd31b96c00614a58ce66809683d1c

src/bts.cpp

@@ -100,6 +100,7 @@ static const struct rate_ctr_desc bts_ctr_description[] = {
 	{ "tbf:reused",			"TBF Reused           "},
 	{ "tbf:alloc:algo-a",		"TBF Alloc Algo A     "},
 	{ "tbf:alloc:algo-b",		"TBF Alloc Algo B     "},
+	{ "tbf:alloc:failed",		"TBF Alloc Failure    "},
 	{ "rlc:sent",			"RLC Sent             "},
 	{ "rlc:resent",			"RLC Resent           "},
 	{ "rlc:restarted",		"RLC Restarted        "},

src/bts.h

@@ -87,6 +87,7 @@ enum {
 	CTR_TBF_REUSED,
 	CTR_TBF_ALLOC_ALGO_A,
 	CTR_TBF_ALLOC_ALGO_B,
+	CTR_TBF_ALLOC_FAIL,
 	CTR_RLC_SENT,
 	CTR_RLC_RESENT,
 	CTR_RLC_RESTARTED,

src/tbf.cpp

@@ -335,6 +335,7 @@ int gprs_rlcmac_tbf::update()
 	/* if no resource */
 	if (rc < 0) {
 		LOGPTBF(this, LOGL_ERROR, "No resource after update???\n");
+		bts_do_rate_ctr_inc(bts, CTR_TBF_ALLOC_FAIL);
 		return -rc;
 	}
 
@@ -754,6 +755,7 @@ int gprs_rlcmac_tbf::setup(int8_t use_trx, bool single_slot)
 		LOGPTBF(this, LOGL_NOTICE,
 			"Timeslot Allocation failed: trx = %d, single_slot = %d\n",
 			use_trx, single_slot);
+		bts_do_rate_ctr_inc(bts, CTR_TBF_ALLOC_FAIL);
 		return -1;
 	}
 	/* assign control ts */