1 files changed, 111 insertions, 0 deletions
diff --git a/include/osmocom/bsc/chan_counts.h b/include/osmocom/bsc/chan_counts.h
new file mode 100644
index 000000000..a830e8745
--- /dev/null
+++ b/include/osmocom/bsc/chan_counts.h
@@ -0,0 +1,111 @@
+/* API to count total, allocated and free channels of all types */
+#pragma once
+
+struct gsm_bts;
+struct gsm_bts_trx;
+struct gsm_bts_trx_ts;
+struct gsm_lchan;
+
+void chan_counts_sig_init(void);
+void chan_counts_ts_update(struct gsm_bts_trx_ts *ts);
+void chan_counts_ts_clear(struct gsm_bts_trx_ts *ts);
+void chan_counts_trx_update(struct gsm_bts_trx *trx);
+void chan_counts_bsc_verify(void);
+
+/* First array index to chan_counts.val. */
+enum chan_counts_dim1 {
+	CHAN_COUNTS1_ALL = 0,
+	CHAN_COUNTS1_STATIC = 1,
+	CHAN_COUNTS1_DYNAMIC = 2,
+	_CHAN_COUNTS1_NUM
+};
+
+/* Second array index to chan_counts.val. */
+enum chan_counts_dim2 {
+	/* The maximum possible nr of lchans of this type. Counts all dynamic timeslots as if they are fully available
+	 * for this type, regardless of the current pchan mode. (For CHAN_COUNTS1_STATIC, of course no dyn TS are counted
+	 * at all.) */
+	CHAN_COUNTS2_MAX_TOTAL = 0,
+	/* Like MAX_TOTAL, but as soon as dynamic timeslots are switched to a specific pchan kind, current_total shrinks
+	 * to count only currently present lchans (used and unused). */
+	CHAN_COUNTS2_CURRENT_TOTAL = 1,
+	/* Currently used lchans of this type. To get currently free lchans, calculate CURRENT_TOTAL - ALLOCATED. */
+	CHAN_COUNTS2_ALLOCATED = 2,
+	/* Currently assignable lchans of this type, same as CURRENT_TOTAL - ALLOCATED. */
+	CHAN_COUNTS2_FREE = 3,
+	_CHAN_COUNTS2_NUM
+};
+
+struct chan_counts {
+	/* Signed type, so that chan_counts_diff() can return negative values. */
+	int val[_CHAN_COUNTS1_NUM][_CHAN_COUNTS2_NUM][_GSM_LCHAN_MAX];
+};
+
+static inline void chan_counts_zero(struct chan_counts *counts)
+{
+	*counts = (struct chan_counts){0};
+}
+
+static inline bool chan_counts_is_zero(const struct chan_counts *counts)
+{
+	int i1, i2, i3;
+	for (i1 = 0; i1 < _CHAN_COUNTS1_NUM; i1++) {
+		for (i2 = 0; i2 < _CHAN_COUNTS2_NUM; i2++) {
+			for (i3 = 0; i3 < _GSM_LCHAN_MAX; i3++) {
+				if (counts->val[i1][i2][i3])
+					return false;
+			}
+		}
+	}
+	return true;
+}
+
+static inline void chan_counts_dim3_add(struct chan_counts *dst,
+					enum chan_counts_dim1 dst_dim1, enum chan_counts_dim2 dst_dim2,
+					const struct chan_counts *add,
+					enum chan_counts_dim1 add_dim1, enum chan_counts_dim2 add_dim2)
+{
+	int i;
+	for (i = 0; i < _GSM_LCHAN_MAX; i++)
+		dst->val[dst_dim1][dst_dim2][i] += add->val[add_dim1][add_dim2][i];
+}
+
+static inline void chan_counts_dim3_sub(struct chan_counts *dst,
+					enum chan_counts_dim1 dst_dim1, enum chan_counts_dim2 dst_dim2,
+					const struct chan_counts *sub,
+					enum chan_counts_dim1 sub_dim1, enum chan_counts_dim2 sub_dim2)
+{
+	int i;
+	for (i = 0; i < _GSM_LCHAN_MAX; i++)
+		dst->val[dst_dim1][dst_dim2][i] -= sub->val[sub_dim1][sub_dim2][i];
+}
+
+static inline void chan_counts_dim2_add(struct chan_counts *dst, enum chan_counts_dim1 dst_dim1,
+					const struct chan_counts *add, enum chan_counts_dim1 add_dim1)
+{
+	int i;
+	for (i = 0; i < _CHAN_COUNTS2_NUM; i++)
+		chan_counts_dim3_add(dst, dst_dim1, i, add, add_dim1, i);
+}
+
+static inline void chan_counts_dim2_sub(struct chan_counts *dst, enum chan_counts_dim1 dst_dim1,
+					const struct chan_counts *sub, enum chan_counts_dim1 sub_dim1)
+{
+	int i;
+	for (i = 0; i < _CHAN_COUNTS2_NUM; i++)
+		chan_counts_dim3_sub(dst, dst_dim1, i, sub, sub_dim1, i);
+}
+
+static inline void chan_counts_add(struct chan_counts *dst, const struct chan_counts *add)
+{
+	int i;
+	for (i = 0; i < _CHAN_COUNTS1_NUM; i++)
+		chan_counts_dim2_add(dst, i, add, i);
+}
+
+static inline void chan_counts_sub(struct chan_counts *dst, const struct chan_counts *sub)
+{
+	int i;
+	for (i = 0; i < _CHAN_COUNTS1_NUM; i++)
+		chan_counts_dim2_sub(dst, i, sub, i);
+}