tbf: Pass the MS object around instead of old_tbf

Currently the old TBF (either uplink or downlink) is passed around at
TBF allocation mainly to get information about the MS. To implement
more complex allocation algorithms, the MS object itself will be
needed anyway.

This commit replaces the old_tbf arguments by MS object arguments.

Sponsored-by: On-Waves ehf

7 files changed, 36 insertions, 33 deletions

diff --git a/src/bts.cpp b/src/bts.cpp
index 4ca53d55..8e565435 100644
--- a/src/bts.cpp
+++ b/src/bts.cpp
@@ -894,7 +894,7 @@ void gprs_rlcmac_pdch::rcv_control_dl_ack_nack(Packet_Downlink_Ack_Nack_t *ack_n
 
 		/* This call will register the new TBF with the MS on success */
 		tbf_alloc_ul(bts_data(), tbf->trx->trx_no, tbf->ms_class(),
-			tbf->tlli(), tbf->ta(), tbf);
+			tbf->tlli(), tbf->ta(), tbf->ms());
 
 		/* schedule uplink assignment */
 		tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS;
diff --git a/src/bts.h b/src/bts.h
index 2ed50307..f2db318d 100644
--- a/src/bts.h
+++ b/src/bts.h
@@ -37,6 +37,7 @@ extern "C" {
 #include <stdint.h>
 
 struct BTS;
+struct GprsMs;
 
 /*
  * PDCH instance
@@ -138,7 +139,7 @@ struct gprs_rlcmac_bts {
 	uint8_t n3105;
 	struct gprs_rlcmac_trx trx[8];
 	int (*alloc_algorithm)(struct gprs_rlcmac_bts *bts,
-		struct gprs_rlcmac_tbf *old_tbf,
+		struct GprsMs *ms,
 		struct gprs_rlcmac_tbf *tbf, uint32_t cust, uint8_t single);
 	uint32_t alloc_algorithm_curst; /* options to customize algorithm */
 	uint8_t force_two_phase;
diff --git a/src/gprs_rlcmac.h b/src/gprs_rlcmac.h
index 6f8a7a4f..dab3338f 100644
--- a/src/gprs_rlcmac.h
+++ b/src/gprs_rlcmac.h
@@ -42,6 +42,7 @@ extern "C" {
 struct gprs_rlcmac_tbf;
 struct gprs_rlcmac_bts;
 struct BTS;
+struct GprsMs;
 
 #ifdef __cplusplus
 /*
@@ -95,11 +96,11 @@ int gprs_rlcmac_rcv_rts_block(struct gprs_rlcmac_bts *bts,
 extern "C" {
 #endif
 int alloc_algorithm_a(struct gprs_rlcmac_bts *bts,
-	struct gprs_rlcmac_tbf *old_tbf,
+	struct GprsMs *ms,
 	struct gprs_rlcmac_tbf *tbf, uint32_t cust, uint8_t single);
 
 int alloc_algorithm_b(struct gprs_rlcmac_bts *bts,
-	struct gprs_rlcmac_tbf *old_tbf,
+	struct GprsMs *ms,
 	struct gprs_rlcmac_tbf *tbf, uint32_t cust, uint8_t single);
 #ifdef __cplusplus
 }
diff --git a/src/gprs_rlcmac_ts_alloc.cpp b/src/gprs_rlcmac_ts_alloc.cpp
index e8bedadd..bae1ea5f 100644
--- a/src/gprs_rlcmac_ts_alloc.cpp
+++ b/src/gprs_rlcmac_ts_alloc.cpp
@@ -23,6 +23,7 @@
 #include <gprs_debug.h>
 #include <bts.h>
 #include <tbf.h>
+#include <gprs_ms.h>
 
 #include <errno.h>
 
@@ -139,7 +140,7 @@ static void assign_dlink_tbf(
  * Assign single slot for uplink and downlink
  */
 int alloc_algorithm_a(struct gprs_rlcmac_bts *bts,
-	struct gprs_rlcmac_tbf *old_tbf,
+	GprsMs *ms,
 	struct gprs_rlcmac_tbf *tbf, uint32_t cust, uint8_t single)
 {
 	struct gprs_rlcmac_pdch *pdch;
@@ -261,16 +262,21 @@ inc_window:
 	return rx_window;
 }
 
-static int reduce_rx_window(const int ms_type, const struct gprs_rlcmac_tbf *old_tbf,
+static int reduce_rx_window(const int ms_type, const GprsMs *ms,
 				const int Tt, const int Tr,
 				int *rx_window,
 				uint8_t *rx_win_min, uint8_t *rx_win_max)
 {
+	gprs_rlcmac_ul_tbf *ul_tbf;
+
 	if (ms_type != 1)
 		return 0;
-	if (!old_tbf)
+	if (!ms)
 		return 0;
-	if (old_tbf->direction != GPRS_RLCMAC_UL_TBF)
+
+	ul_tbf = ms->ul_tbf();
+
+	if (!ul_tbf)
 		return 0;
 
 	uint8_t collide = 0, ul_usage = 0;
@@ -278,7 +284,7 @@ static int reduce_rx_window(const int ms_type, const struct gprs_rlcmac_tbf *old
 	/* calculate mask of colliding slots */
 	for (uint8_t ts_no = 0; ts_no < 8; ts_no++) {
 		int j;
-		if (!old_tbf->pdch[ts_no])
+		if (!ul_tbf->pdch[ts_no])
 			continue;
 
 		ul_usage |= (1 << ts_no);
@@ -525,7 +531,7 @@ static int select_first_ts(gprs_rlcmac_trx *trx, uint8_t tx_win_min,
  *
  */
 int alloc_algorithm_b(struct gprs_rlcmac_bts *bts,
-	struct gprs_rlcmac_tbf *old_tbf,
+	GprsMs *ms,
 	struct gprs_rlcmac_tbf *tbf, uint32_t cust, uint8_t single)
 {
 	const struct gprs_ms_multislot_class *ms_class;
@@ -592,7 +598,7 @@ int alloc_algorithm_b(struct gprs_rlcmac_bts *bts,
 
 
 	/* reduce window, if existing uplink slots collide RX window */
-	int rc = reduce_rx_window(ms_class->type, old_tbf, Tt, Tr,
+	int rc = reduce_rx_window(ms_class->type, ms, Tt, Tr,
 				&rx_window, &rx_win_min, &rx_win_max);
 	if (rc < 0)
 		return rc;
diff --git a/src/tbf.cpp b/src/tbf.cpp
index 3252d0ac..5eda01eb 100644
--- a/src/tbf.cpp
+++ b/src/tbf.cpp
@@ -184,7 +184,7 @@ void gprs_rlcmac_tbf::update_ms(uint32_t tlli, enum gprs_rlcmac_tbf_direction di
 
 gprs_rlcmac_ul_tbf *tbf_alloc_ul(struct gprs_rlcmac_bts *bts,
 	int8_t use_trx, uint8_t ms_class,
-	uint32_t tlli, uint8_t ta, struct gprs_rlcmac_tbf *dl_tbf)
+	uint32_t tlli, uint8_t ta, GprsMs *ms)
 {
 	uint8_t trx;
 	struct gprs_rlcmac_ul_tbf *tbf;
@@ -199,7 +199,7 @@ gprs_rlcmac_ul_tbf *tbf_alloc_ul(struct gprs_rlcmac_bts *bts,
 		return NULL;
 	}
 	/* use multislot class of downlink TBF */
-	tbf = tbf_alloc_ul_tbf(bts, dl_tbf, tfi, trx, ms_class, 0);
+	tbf = tbf_alloc_ul_tbf(bts, ms, tfi, trx, ms_class, 0);
 	if (!tbf) {
 		LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH resource\n");
 		/* FIXME: send reject */
@@ -274,7 +274,6 @@ void tbf_free(struct gprs_rlcmac_tbf *tbf)
 
 int gprs_rlcmac_tbf::update()
 {
-	struct gprs_rlcmac_tbf *ul_tbf = NULL;
 	struct gprs_rlcmac_bts *bts_data = bts->bts_data();
 	int rc;
 
@@ -283,11 +282,8 @@ int gprs_rlcmac_tbf::update()
 	if (direction != GPRS_RLCMAC_DL_TBF)
 		return -EINVAL;
 
-	if (ms())
-		ul_tbf = ms()->ul_tbf();
-
 	tbf_unlink_pdch(this);
-	rc = bts_data->alloc_algorithm(bts_data, ul_tbf, this, bts_data->alloc_algorithm_curst, 0);
+	rc = bts_data->alloc_algorithm(bts_data, ms(), this, bts_data->alloc_algorithm_curst, 0);
 	/* if no resource */
 	if (rc < 0) {
 		LOGP(DRLCMAC, LOGL_ERROR, "No resource after update???\n");
@@ -450,7 +446,7 @@ void gprs_rlcmac_tbf::poll_timeout()
 }
 
 static int setup_tbf(struct gprs_rlcmac_tbf *tbf, struct gprs_rlcmac_bts *bts,
-	struct gprs_rlcmac_tbf *old_tbf, uint8_t tfi, uint8_t trx,
+	GprsMs *ms, uint8_t tfi, uint8_t trx,
 	uint8_t ms_class, uint8_t single_slot)
 {
 	int rc;
@@ -470,7 +466,7 @@ static int setup_tbf(struct gprs_rlcmac_tbf *tbf, struct gprs_rlcmac_bts *bts,
 	tbf->trx = &bts->trx[trx];
 	tbf->set_ms_class(ms_class);
 	/* select algorithm */
-	rc = bts->alloc_algorithm(bts, old_tbf, tbf, bts->alloc_algorithm_curst,
+	rc = bts->alloc_algorithm(bts, ms, tbf, bts->alloc_algorithm_curst,
 		single_slot);
 	/* if no resource */
 	if (rc < 0) {
@@ -493,7 +489,7 @@ static int setup_tbf(struct gprs_rlcmac_tbf *tbf, struct gprs_rlcmac_bts *bts,
 
 
 struct gprs_rlcmac_ul_tbf *tbf_alloc_ul_tbf(struct gprs_rlcmac_bts *bts,
-	struct gprs_rlcmac_tbf *old_tbf, uint8_t tfi, uint8_t trx,
+	GprsMs *ms, uint8_t tfi, uint8_t trx,
 	uint8_t ms_class, uint8_t single_slot)
 {
 	struct gprs_rlcmac_ul_tbf *tbf;
@@ -512,7 +508,7 @@ struct gprs_rlcmac_ul_tbf *tbf_alloc_ul_tbf(struct gprs_rlcmac_bts *bts,
 		return NULL;
 
 	tbf->direction = GPRS_RLCMAC_UL_TBF;
-	rc = setup_tbf(tbf, bts, old_tbf, tfi, trx, ms_class, single_slot);
+	rc = setup_tbf(tbf, bts, ms, tfi, trx, ms_class, single_slot);
 	/* if no resource */
 	if (rc < 0) {
 		talloc_free(tbf);
@@ -522,8 +518,8 @@ struct gprs_rlcmac_ul_tbf *tbf_alloc_ul_tbf(struct gprs_rlcmac_bts *bts,
 	llist_add(&tbf->list.list, &bts->ul_tbfs);
 	tbf->bts->tbf_ul_created();
 
-	if (old_tbf && old_tbf->ms())
-		tbf->set_ms(old_tbf->ms());
+	if (ms)
+		tbf->set_ms(ms);
 
 	if (tbf->ms())
 		tbf->ms()->attach_ul_tbf(tbf);
@@ -532,7 +528,7 @@ struct gprs_rlcmac_ul_tbf *tbf_alloc_ul_tbf(struct gprs_rlcmac_bts *bts,
 }
 
 struct gprs_rlcmac_dl_tbf *tbf_alloc_dl_tbf(struct gprs_rlcmac_bts *bts,
-	struct gprs_rlcmac_tbf *old_tbf, uint8_t tfi, uint8_t trx,
+	GprsMs *ms, uint8_t tfi, uint8_t trx,
 	uint8_t ms_class, uint8_t single_slot)
 {
 	struct gprs_rlcmac_dl_tbf *tbf;
@@ -551,7 +547,7 @@ struct gprs_rlcmac_dl_tbf *tbf_alloc_dl_tbf(struct gprs_rlcmac_bts *bts,
 		return NULL;
 
 	tbf->direction = GPRS_RLCMAC_DL_TBF;
-	rc = setup_tbf(tbf, bts, old_tbf, tfi, trx, ms_class, single_slot);
+	rc = setup_tbf(tbf, bts, ms, tfi, trx, ms_class, single_slot);
 	/* if no resource */
 	if (rc < 0) {
 		talloc_free(tbf);
@@ -567,8 +563,7 @@ struct gprs_rlcmac_dl_tbf *tbf_alloc_dl_tbf(struct gprs_rlcmac_bts *bts,
 	gettimeofday(&tbf->m_bw.dl_bw_tv, NULL);
 	gettimeofday(&tbf->m_bw.dl_loss_tv, NULL);
 
-	if (old_tbf && old_tbf->ms())
-		tbf->set_ms(old_tbf->ms());
+	tbf->set_ms(ms);
 
 	if (tbf->ms())
 		tbf->ms()->attach_dl_tbf(tbf);
diff --git a/src/tbf.h b/src/tbf.h
index 0f53a277..cf8cdfc6 100644
--- a/src/tbf.h
+++ b/src/tbf.h
@@ -240,16 +240,15 @@ private:
 
 struct gprs_rlcmac_ul_tbf *tbf_alloc_ul(struct gprs_rlcmac_bts *bts,
 	int8_t use_trx, uint8_t ms_class,
-	uint32_t tlli, uint8_t ta, struct gprs_rlcmac_tbf *dl_tbf);
+	uint32_t tlli, uint8_t ta, GprsMs *ms);
 
 struct gprs_rlcmac_ul_tbf *tbf_alloc_ul_tbf(struct gprs_rlcmac_bts *bts,
-	struct gprs_rlcmac_tbf *old_tbf,
+	GprsMs *ms,
 	uint8_t tfi, uint8_t trx,
 	uint8_t ms_class, uint8_t single_slot);
 
 struct gprs_rlcmac_dl_tbf *tbf_alloc_dl_tbf(struct gprs_rlcmac_bts *bts,
-	struct gprs_rlcmac_tbf *old_tbf,
-	uint8_t tfi, uint8_t trx,
+	GprsMs *ms, uint8_t tfi, uint8_t trx,
 	uint8_t ms_class, uint8_t single_slot);
 
 void tbf_free(struct gprs_rlcmac_tbf *tbf);
diff --git a/src/tbf_dl.cpp b/src/tbf_dl.cpp
index 853821ca..c7a04bf4 100644
--- a/src/tbf_dl.cpp
+++ b/src/tbf_dl.cpp
@@ -155,6 +155,7 @@ static int tbf_new_dl_assignment(struct gprs_rlcmac_bts *bts,
 		ul_tbf = ms->ul_tbf();
 		ta = ms->ta();
 	}
+	/* TODO: if (!ms) create MS before tbf_alloc is called? */
 
 	if (ul_tbf && ul_tbf->m_contention_resolution_done
 	 && !ul_tbf->m_final_ack_sent) {
@@ -172,7 +173,7 @@ static int tbf_new_dl_assignment(struct gprs_rlcmac_bts *bts,
 	tfi = bts->bts->tfi_find_free(GPRS_RLCMAC_DL_TBF, &trx, use_trx);
 	if (tfi >= 0)
 		/* set number of downlink slots according to multislot class */
-		dl_tbf = tbf_alloc_dl_tbf(bts, ul_tbf, tfi, trx, ms_class, ss);
+		dl_tbf = tbf_alloc_dl_tbf(bts, ms, tfi, trx, ms_class, ss);
 
 	if (!dl_tbf) {
 		LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH resource\n");