pcuif: Submit data_req with len=0 as idle frames
This way PCU always answers DATA.ind and the BTS can still clearly identify idle frames. It also simplifies testing and verification of correct behavior. Related: SYS#4919 Change-Id: Ife718eeed2af011479c03099ea109518f04567bc
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@ -412,7 +412,7 @@ int gprs_rlcmac_rcv_rts_block(struct gprs_rlcmac_bts *bts,
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uint8_t usf;
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struct msgb *msg = NULL;
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uint32_t poll_fn;
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enum pcu_gsmtap_category gsmtap_cat;
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enum pcu_gsmtap_category gsmtap_cat = PCU_GSMTAP_C_DL_DUMMY; /* init: make gcc happy */
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bool tx_is_egprs = false;
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bool require_gprs_only;
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enum mcs_kind req_mcs_kind; /* Restrict CS/MCS if DL Data block is to be sent */
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@ -487,9 +487,9 @@ int gprs_rlcmac_rcv_rts_block(struct gprs_rlcmac_bts *bts,
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}
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/* Prio 3: send dummy control message if need to poll or USF */
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else {
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/* If there's no TBF attached to this PDCH, we can early skip
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* since there's nothing to transmit nor to poll/USF. This way
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* we help BTS energy saving (on TRX!=C0) by sending nothing
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/* If there's no TBF attached to this PDCH, we can submit an empty
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* data_req since there's nothing to transmit nor to poll/USF. This
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* way we help BTS energy saving (on TRX!=C0) by sending nothing
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* instead of a dummy block. The early return is done here and
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* not at the start of the function because the condition below
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* (num_tbfs==0) may not be enough, because temporary dummy TBFs
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@ -505,13 +505,11 @@ int gprs_rlcmac_rcv_rts_block(struct gprs_rlcmac_bts *bts,
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* TRX0, since BTS is not preparing dummy bursts on idle TS for us */
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skip_idle = skip_idle && trx != 0;
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#endif
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if (skip_idle)
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return 0;
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if ((msg = sched_dummy())) {
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if (!skip_idle && (msg = sched_dummy())) {
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/* increase counter */
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gsmtap_cat = PCU_GSMTAP_C_DL_DUMMY;
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} else {
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return -ENOMEM;
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msg = NULL; /* submit empty frame */
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}
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}
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@ -521,6 +519,10 @@ int gprs_rlcmac_rcv_rts_block(struct gprs_rlcmac_bts *bts,
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pdch->fn_without_cs14 = 0;
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}
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/* Used to measure the leak rate, count all blocks */
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gprs_bssgp_update_frames_sent();
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if (msg) {
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/* msg is now available */
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bts_do_rate_ctr_add(bts, CTR_RLC_DL_BYTES, msgb_length(msg));
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@ -529,13 +531,11 @@ int gprs_rlcmac_rcv_rts_block(struct gprs_rlcmac_bts *bts,
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usf = usf_tbf ? usf_tbf->m_usf[ts] : USF_UNUSED;
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msg->data[0] = (msg->data[0] & 0xf8) | usf;
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/* Used to measure the leak rate, count all blocks */
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gprs_bssgp_update_frames_sent();
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/* Send to GSMTAP */
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tap_n_acc(msg, bts, trx, ts, fn, gsmtap_cat);
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}
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/* send PDTCH/PACCH to L1 */
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/* send PDTCH/PACCH to L1. msg=NULL accepted too (idle block) */
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pcu_l1if_tx_pdtch(msg, bts, trx, ts, bts->trx[trx].arfcn, fn, block_nr);
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return 0;
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@ -212,6 +212,7 @@ static int pcu_tx_data_req(struct gprs_rlcmac_bts *bts, uint8_t trx, uint8_t ts,
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data_req->trx_nr = trx;
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data_req->ts_nr = ts;
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data_req->block_nr = block_nr;
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if (len)
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memcpy(data_req->data, data, len);
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data_req->len = len;
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@ -223,12 +224,20 @@ void pcu_l1if_tx_pdtch(msgb *msg, struct gprs_rlcmac_bts *bts, uint8_t trx, uint
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{
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#ifdef ENABLE_DIRECT_PHY
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if (bts->trx[trx].fl1h) {
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if (!msg) /* Simply skip sending idle frames to L1 */
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return;
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l1if_pdch_req(bts->trx[trx].fl1h, ts, 0, fn, arfcn, block_nr,
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msg->data, msg->len);
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msgb_free(msg);
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return;
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}
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#endif
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if (!msg) {
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pcu_tx_data_req(bts, trx, ts, PCU_IF_SAPI_PDTCH, arfcn, fn, block_nr,
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NULL, 0);
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return;
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}
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pcu_tx_data_req(bts, trx, ts, PCU_IF_SAPI_PDTCH, arfcn, fn, block_nr,
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msg->data, msg->len);
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msgb_free(msg);
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@ -243,10 +252,17 @@ void pcu_l1if_tx_ptcch(struct gprs_rlcmac_bts *bts,
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gsmtap_send(the_pcu->gsmtap, arfcn, ts, GSMTAP_CHANNEL_PTCCH, 0, fn, 0, 0, data, data_len);
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#ifdef ENABLE_DIRECT_PHY
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if (bts->trx[trx].fl1h) {
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if (!data_len) /* Simply skip sending idle frames to L1 */
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return;
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l1if_pdch_req(bts->trx[trx].fl1h, ts, 1, fn, arfcn, block_nr, data, data_len);
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return;
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}
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#endif
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if (!data_len) {
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pcu_tx_data_req(bts, trx, ts, PCU_IF_SAPI_PTCCH, arfcn, fn, block_nr, NULL, 0);
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return;
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}
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pcu_tx_data_req(bts, trx, ts, PCU_IF_SAPI_PTCCH, arfcn, fn, block_nr, data, data_len);
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}
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@ -544,8 +560,11 @@ int pcu_rx_rts_req_ptcch(struct gprs_rlcmac_bts *bts, uint8_t trx, uint8_t ts,
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* TRX0, since BTS is not preparing dummy bursts on idle TS for us: */
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skip_idle = skip_idle && trx != 0;
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#endif
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if (skip_idle)
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if (skip_idle) {
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pcu_l1if_tx_ptcch(bts, trx, ts, bts->trx[trx].arfcn, fn, block_nr,
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NULL, 0);
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return 0;
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}
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pcu_l1if_tx_ptcch(bts, trx, ts, bts->trx[trx].arfcn, fn, block_nr,
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pdch->ptcch_msg, GSM_MACBLOCK_LEN);
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