add comments to describe functions

Change-Id: Ie351632001abbeb82008a5eecae0d0323a8ef7d7
Reviewed-on: https://gerrit.osmocom.org/106
Reviewed-by: Harald Welte <laforge@gnumonks.org>
Tested-by: Jenkins Builder

src/bts.cpp

@@ -1317,6 +1317,7 @@ int gprs_rlcmac_pdch::rcv_block(uint8_t *data, uint8_t len, uint32_t fn,
 	return -EINVAL;
 }
 
+/*! \brief process egprs and gprs data blocks */
 int gprs_rlcmac_pdch::rcv_data_block(uint8_t *data, uint32_t fn,
 	struct pcu_l1_meas *meas, GprsCodingScheme cs)
 {

src/tbf_ul.cpp

@@ -138,6 +138,7 @@ struct msgb *gprs_rlcmac_ul_tbf::create_ul_ack(uint32_t fn, uint8_t ts)
 	return msg;
 }
 
+/*! \brief receive data from PDCH/L1 */
 int gprs_rlcmac_ul_tbf::rcv_data_block_acknowledged(
 	const struct gprs_rlc_data_info *rlc,
 	uint8_t *data, struct pcu_l1_meas *meas)