From 8e2bd1e79d1f5e5e3341a76044fe443dad3f2722 Mon Sep 17 00:00:00 2001
From: Vadim Yanitskiy <vyanitskiy@sysmocom.de>
Date: Tue, 21 Jul 2020 00:54:42 +0700
Subject: [PATCH] pcuif_proto: version 10: add frequency hopping parameters

Change-Id: I6863830883d90954006a7126c22d348aa2a83271
Related: SYS#4868, OS#4547
---
 include/osmocom/pcu/pcuif_proto.h | 15 ++++++++++++---
 src/pcu_l1_if.cpp                 | 25 ++++++++++++++++++++++---
 2 files changed, 34 insertions(+), 6 deletions(-)

diff --git a/include/osmocom/pcu/pcuif_proto.h b/include/osmocom/pcu/pcuif_proto.h
index e88607e6..61c63af6 100644
--- a/include/osmocom/pcu/pcuif_proto.h
+++ b/include/osmocom/pcu/pcuif_proto.h
@@ -5,7 +5,7 @@
 
 #define PCU_SOCK_DEFAULT	"/tmp/pcu_bts"
 
-#define PCU_IF_VERSION		0x09
+#define PCU_IF_VERSION		0x0a
 #define TXT_MAX_LEN	128
 
 /* msg_type */
@@ -112,12 +112,21 @@ struct gsm_pcu_if_rach_ind {
 	uint8_t		ts_nr;
 } __attribute__ ((packed));
 
+struct gsm_pcu_if_info_ts {
+	uint8_t		tsc;
+	uint8_t		h;
+	uint8_t		hsn;
+	uint8_t		maio;
+	uint8_t		ma_bit_len;
+	uint8_t		ma[8];
+} __attribute__ ((packed));
+
 struct gsm_pcu_if_info_trx {
 	uint16_t	arfcn;
-	uint8_t		pdch_mask;		/* PDCH channels per TS */
+	uint8_t		pdch_mask;		/* PDCH timeslot mask */
 	uint8_t		spare;
-	uint8_t		tsc[8];			/* TSC per channel */
 	uint32_t	hlayer1;
+	struct gsm_pcu_if_info_ts ts[8];	/* timeslots per TRX */
 } __attribute__ ((packed));
 
 struct gsm_pcu_if_info_ind {
diff --git a/src/pcu_l1_if.cpp b/src/pcu_l1_if.cpp
index 2374606b..c2cc2c16 100644
--- a/src/pcu_l1_if.cpp
+++ b/src/pcu_l1_if.cpp
@@ -630,6 +630,7 @@ bssgp_failed:
 		}
 
 		for (ts_nr = 0; ts_nr < ARRAY_SIZE(bts->trx[0].pdch); ts_nr++) {
+			const struct gsm_pcu_if_info_ts *its = &info_ind->trx[trx_nr].ts[ts_nr];
 			struct gprs_rlcmac_pdch *pdch = &bts->trx[trx_nr].pdch[ts_nr];
 			if ((info_ind->trx[trx_nr].pdch_mask & (1 << ts_nr))) {
 				/* FIXME: activate dynamically at RLCMAC */
@@ -643,9 +644,27 @@ bssgp_failed:
 					pcu_tx_act_req(trx_nr, ts_nr, 1);
 					pdch->enable();
 				}
-				pdch->tsc = info_ind->trx[trx_nr].tsc[ts_nr];
-				LOGP(DL1IF, LOGL_INFO, "PDCH: trx=%d ts=%d\n",
-					trx_nr, ts_nr);
+
+				pdch->tsc = its->tsc;
+
+				/* (Optional) frequency hopping parameters */
+				if (its->h) {
+					pdch->fh.enabled = true;
+					pdch->fh.maio    = its->maio;
+					pdch->fh.hsn     = its->hsn;
+
+					OSMO_ASSERT(its->ma_bit_len <= sizeof(pdch->fh.ma) * 8);
+					pdch->fh.ma_oct_len = OSMO_BYTES_FOR_BITS(its->ma_bit_len);
+					pdch->fh.ma_bit_len = its->ma_bit_len;
+
+					/* Mobile Allocation + padding (byte/bit order as on the wire):
+					 * | 00 00 00 00 00 cc bb aa | -> | cc bb aa 00 00 00 00 00 | */
+					unsigned int offset = sizeof(pdch->fh.ma) - pdch->fh.ma_oct_len;
+					memcpy(pdch->fh.ma, its->ma + offset, pdch->fh.ma_oct_len);
+				}
+
+				LOGP(DL1IF, LOGL_INFO, "PDCH (trx=%u, ts=%u): tsc=%u, hopping=%s\n",
+				     trx_nr, ts_nr, pdch->tsc, pdch->fh.enabled ? "yes" : "no");
 			} else {
 				if (pdch->is_enabled()) {
 					pcu_tx_act_req(trx_nr, ts_nr, 0);