Simplify TS alloc: separate capacity computation
Move TRX capacity computation into separate function and document it. Change-Id: Ifd88fc7ff818ea2a041eae61c5d457926a0df0f2 Related: OS#2282
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@ -61,24 +61,6 @@ static bool test_and_set_bit(uint32_t *bits, size_t elem)
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return was_set;
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}
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static inline int8_t find_free_usf(const struct gprs_rlcmac_pdch *pdch)
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{
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uint8_t usf_map = 0;
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uint8_t usf;
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usf_map = pdch->assigned_usf();
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if (usf_map == (1 << 7) - 1)
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return -1;
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/* look for USF, don't use USF=7 */
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for (usf = 0; usf < 7; usf++) {
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if (!(usf_map & (1 << usf)))
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return usf;
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}
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return -1;
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}
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static inline int8_t find_free_tfi(const struct gprs_rlcmac_pdch *pdch, enum gprs_rlcmac_tbf_direction dir)
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{
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uint32_t tfi_map = pdch->assigned_tfi(dir);
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@ -214,7 +196,7 @@ static int find_least_busy_pdch(const struct gprs_rlcmac_trx *trx, enum gprs_rlc
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}
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/* Make sure that an USF is available */
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if (dir == GPRS_RLCMAC_UL_TBF) {
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usf = find_free_usf(pdch);
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usf = find_free_usf(pdch->assigned_usf());
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if (usf < 0) {
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LOGP(DRLCMAC, LOGL_DEBUG,
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"- Skipping TS %d, because "
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@ -464,6 +446,33 @@ int alloc_algorithm_a(struct gprs_rlcmac_bts *bts, GprsMs *ms_, struct gprs_rlcm
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return 0;
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}
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/*! Compute capacity of a given TRX
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*
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* \param[in] trx Pointer to TRX object
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* \param[in] rx_window Receive window
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* \param[in] tx_window Transmit window
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* \returns non-negative capacity
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*/
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static inline unsigned compute_capacity(const struct gprs_rlcmac_trx *trx, int rx_window, int tx_window)
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{
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const struct gprs_rlcmac_pdch *pdch;
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unsigned ts, capacity = 0;
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for (ts = 0; ts < ARRAY_SIZE(trx->pdch); ts++) {
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pdch = &trx->pdch[ts];
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if (rx_window & (1 << ts))
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capacity += OSMO_MAX(32 - pdch->num_reserved(GPRS_RLCMAC_DL_TBF), 1);
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/* Only consider common slots for UL */
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if (tx_window & rx_window & (1 << ts)) {
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if (find_free_usf(pdch->assigned_usf()) >= 0)
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capacity += OSMO_MAX(32 - pdch->num_reserved(GPRS_RLCMAC_UL_TBF), 1);
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}
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}
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return capacity;
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}
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/*! Find set of slots available for allocation while taking MS class into account
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*
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* \param[in] trx Pointer to TRX object
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@ -564,7 +573,6 @@ int find_multi_slots(struct gprs_rlcmac_trx *trx, uint8_t mslot_class, uint8_t *
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unsigned rx_slot_count;
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uint16_t rx_bad;
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uint8_t rx_good;
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unsigned ts;
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int capacity;
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/* Filter out bad slots */
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@ -663,25 +671,7 @@ int find_multi_slots(struct gprs_rlcmac_trx *trx, uint8_t mslot_class, uint8_t *
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}
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/* Compute capacity */
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capacity = 0;
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for (ts = 0; ts < ARRAY_SIZE(trx->pdch); ts++) {
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int c;
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const struct gprs_rlcmac_pdch *pdch = &trx->pdch[ts];
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if (rx_window & (1 << ts)) {
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c = 32 - pdch->num_reserved(GPRS_RLCMAC_DL_TBF);
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c = OSMO_MAX(c, 1);
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capacity += c;
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}
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/* Only consider common slots for UL */
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if (tx_window & rx_window & (1 << ts)) {
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if (find_free_usf(pdch) >= 0) {
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c = 32 - pdch->num_reserved(GPRS_RLCMAC_UL_TBF);
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c = OSMO_MAX(c, 1);
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capacity += c;
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}
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}
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}
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capacity = compute_capacity(trx, rx_window, tx_window);
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#ifdef ENABLE_TS_ALLOC_DEBUG
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LOGP(DRLCMAC, LOGL_DEBUG,
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@ -702,7 +692,10 @@ int find_multi_slots(struct gprs_rlcmac_trx *trx, uint8_t mslot_class, uint8_t *
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max_capacity = capacity;
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max_ul_slots = tx_window;
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max_dl_slots = rx_window;
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}}}}
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}
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}
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}
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}
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if (!max_ul_slots || !max_dl_slots) {
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LOGP(DRLCMAC, LOGL_NOTICE,
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@ -212,3 +212,19 @@ void mslot_fill_rx_mask(uint8_t mslot_class, uint8_t num_tx, uint8_t *rx_mask)
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rx_mask[MASK_TT] = (rx_mask[MASK_TT] << 3) | (rx_mask[MASK_TT] >> 5);
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rx_mask[MASK_TR] = (rx_mask[MASK_TR] << 3) | (rx_mask[MASK_TR] >> 5);
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}
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/* look for USF, don't use USF=7 */
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int8_t find_free_usf(uint8_t usf_map)
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{
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uint8_t usf;
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if (usf_map == (1 << 7) - 1)
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return -1;
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for (usf = 0; usf < 7; usf++) {
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if (!(usf_map & (1 << usf)))
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return usf;
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}
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return -1;
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}
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@ -50,3 +50,4 @@ uint8_t mslot_class_get_type(uint8_t ms_cl);
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uint8_t mslot_class_max();
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void mslot_fill_rx_mask(uint8_t mslot_class, uint8_t num_tx, uint8_t *rx_mask);
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int8_t find_free_usf(uint8_t usf_map);
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