trxcon: clean up DATA / TRAFFIC indication API

  - change 'l1ctl_tx_data_ind' symbol to 'l1ctl_tx_dt_ind' in
    order to indicate that it's used for both DATA and TRAFFIC;

  - introduce a 'traffic' flag, which is used to define either
    TRAFFIC or DATA indication type;

  - pass L2 payload and its length separately from the
    Downlink info header.

Change-Id: I9fe65ee9b2d772576b86b7bc85d53518530d1579

3 files changed, 23 insertions, 27 deletions

diff --git a/src/host/trxcon/l1ctl.c b/src/host/trxcon/l1ctl.c
index 3702e8a7..3de0cf68 100644
--- a/src/host/trxcon/l1ctl.c
+++ b/src/host/trxcon/l1ctl.c
@@ -183,29 +183,30 @@ int l1ctl_tx_ccch_mode_conf(struct l1ctl_link *l1l, uint8_t mode)
 	return l1ctl_link_send(l1l, msg);
 }
 
-int l1ctl_tx_data_ind(struct l1ctl_link *l1l,
-	struct l1ctl_info_dl *data, uint8_t msg_type)
+/**
+ * Handles both L1CTL_DATA_IND and L1CTL_TRAFFIC_IND.
+ */
+int l1ctl_tx_dt_ind(struct l1ctl_link *l1l, struct l1ctl_info_dl *data,
+	uint8_t *l2, size_t l2_len, bool traffic)
 {
 	struct l1ctl_info_dl *dl;
 	struct msgb *msg;
-	size_t len;
-
-	if (msg_type != L1CTL_DATA_IND && msg_type != L1CTL_TRAFFIC_IND) {
-		LOGP(DL1D, LOGL_ERROR, "Incorrect indication type\n");
-		return -EINVAL;
-	}
+	uint8_t *msg_l2;
 
-	msg = l1ctl_alloc_msg(msg_type);
+	msg = l1ctl_alloc_msg(traffic ?
+		L1CTL_TRAFFIC_IND : L1CTL_DATA_IND);
 	if (msg == NULL)
 		return -ENOMEM;
 
-	/* We store the payload as a flexible array member */
-	len = sizeof(struct l1ctl_info_dl);
-	len += msg_type == L1CTL_DATA_IND ? 23 : TRAFFIC_DATA_LEN;
-	dl = (struct l1ctl_info_dl *) msgb_put(msg, len);
+	/* Copy DL header */
+	dl = (struct l1ctl_info_dl *) msgb_put(msg, sizeof(*dl));
+	memcpy(dl, data, sizeof(*dl));
 
-	/* Copy header and data from source message */
-	memcpy(dl, data, len);
+	/* Copy the L2 payload if preset */
+	if (l2 && l2_len > 0) {
+		msg_l2 = (uint8_t *) msgb_put(msg, l2_len);
+		memcpy(msg_l2, l2, l2_len);
+	}
 
 	/* Put message to upper layers */
 	return l1ctl_link_send(l1l, msg);
diff --git a/src/host/trxcon/l1ctl.h b/src/host/trxcon/l1ctl.h
index 290a0f52..ca8c0be6 100644
--- a/src/host/trxcon/l1ctl.h
+++ b/src/host/trxcon/l1ctl.h
@@ -18,8 +18,8 @@ int l1ctl_tx_pm_conf(struct l1ctl_link *l1l, uint16_t band_arfcn,
 int l1ctl_tx_reset_conf(struct l1ctl_link *l1l, uint8_t type);
 int l1ctl_tx_reset_ind(struct l1ctl_link *l1l, uint8_t type);
 
-int l1ctl_tx_data_ind(struct l1ctl_link *l1l,
-	struct l1ctl_info_dl *data, uint8_t msg_type);
+int l1ctl_tx_dt_ind(struct l1ctl_link *l1l, struct l1ctl_info_dl *data,
+	uint8_t *l2, size_t l2_len, bool traffic);
 int l1ctl_tx_dt_conf(struct l1ctl_link *l1l,
 	struct l1ctl_info_dl *data, bool traffic);
 int l1ctl_tx_rach_conf(struct l1ctl_link *l1l, uint32_t fn);
diff --git a/src/host/trxcon/sched_lchan_common.c b/src/host/trxcon/sched_lchan_common.c
index d946e577..13c87649 100644
--- a/src/host/trxcon/sched_lchan_common.c
+++ b/src/host/trxcon/sched_lchan_common.c
@@ -90,7 +90,7 @@ int sched_send_data_ind(struct trx_instance *trx, struct trx_ts *ts,
 	struct l1ctl_info_dl *data;
 
 	/* Allocate memory */
-	data = talloc_zero_size(ts, sizeof(struct l1ctl_info_dl) + l2_len);
+	data = talloc_zero_size(ts, sizeof(struct l1ctl_info_dl));
 	if (data == NULL)
 		return -ENOMEM;
 
@@ -108,17 +108,12 @@ int sched_send_data_ind(struct trx_instance *trx, struct trx_ts *ts,
 	/* FIXME: set proper values */
 	data->snr = 0;
 
-	if (dec_failed) {
-		/* Mark frame as broken */
-		data->fire_crc = 2;
-	} else {
-		/* Fill in the payload */
-		memcpy(data->payload, l2, l2_len);
-	}
+	/* Mark frame as broken if so */
+	data->fire_crc = dec_failed ? 2 : 0;
 
 	/* Put a packet to higher layers */
-	l1ctl_tx_data_ind(trx->l1l, data, l2_len == GSM_MACBLOCK_LEN ?
-		L1CTL_DATA_IND : L1CTL_TRAFFIC_IND);
+	l1ctl_tx_dt_ind(trx->l1l, data, l2, l2_len,
+		l2_len != GSM_MACBLOCK_LEN);
 	talloc_free(data);
 
 	return 0;