diff options
Diffstat (limited to 'src/gprs_rlcmac_ts_alloc.cpp')
-rw-r--r-- | src/gprs_rlcmac_ts_alloc.cpp | 105 |
1 files changed, 58 insertions, 47 deletions
diff --git a/src/gprs_rlcmac_ts_alloc.cpp b/src/gprs_rlcmac_ts_alloc.cpp index 0e8b785f..e394a6e4 100644 --- a/src/gprs_rlcmac_ts_alloc.cpp +++ b/src/gprs_rlcmac_ts_alloc.cpp @@ -58,7 +58,7 @@ static bool test_and_set_bit(uint32_t *bits, size_t elem) return was_set; } -static inline int8_t find_free_usf(struct gprs_rlcmac_pdch *pdch) +static inline int8_t find_free_usf(const struct gprs_rlcmac_pdch *pdch) { uint8_t usf_map = 0; uint8_t usf; @@ -76,13 +76,11 @@ static inline int8_t find_free_usf(struct gprs_rlcmac_pdch *pdch) return -1; } -static inline int8_t find_free_tfi(struct gprs_rlcmac_pdch *pdch, - enum gprs_rlcmac_tbf_direction dir) +static inline int8_t find_free_tfi(const struct gprs_rlcmac_pdch *pdch, enum gprs_rlcmac_tbf_direction dir) { - uint32_t tfi_map = 0; + uint32_t tfi_map = pdch->assigned_tfi(dir); int8_t tfi; - tfi_map = pdch->assigned_tfi(dir); if (tfi_map == NO_FREE_TFI) return -1; @@ -95,16 +93,15 @@ static inline int8_t find_free_tfi(struct gprs_rlcmac_pdch *pdch, return -1; } -static int find_possible_pdchs(struct gprs_rlcmac_trx *trx, - size_t max_slots, - uint8_t mask, const char *mask_reason = NULL) +static int find_possible_pdchs(const struct gprs_rlcmac_trx *trx, size_t max_slots, uint8_t mask, + const char *mask_reason = NULL) { unsigned ts; int valid_ts_set = 0; int8_t last_tsc = -1; /* must be signed */ for (ts = 0; ts < ARRAY_SIZE(trx->pdch); ts++) { - struct gprs_rlcmac_pdch *pdch; + const struct gprs_rlcmac_pdch *pdch; pdch = &trx->pdch[ts]; if (!pdch->is_enabled()) { @@ -142,22 +139,19 @@ static int find_possible_pdchs(struct gprs_rlcmac_trx *trx, return valid_ts_set; } -static int compute_usage_by_num_tbfs(struct gprs_rlcmac_pdch *pdch, - enum gprs_rlcmac_tbf_direction dir) +static int compute_usage_by_num_tbfs(const struct gprs_rlcmac_pdch *pdch, enum gprs_rlcmac_tbf_direction dir) { return pdch->num_tbfs(dir); } -static int compute_usage_by_reservation(struct gprs_rlcmac_pdch *pdch, - enum gprs_rlcmac_tbf_direction) +static int compute_usage_by_reservation(const struct gprs_rlcmac_pdch *pdch, enum gprs_rlcmac_tbf_direction) { return pdch->num_reserved(GPRS_RLCMAC_DL_TBF) + pdch->num_reserved(GPRS_RLCMAC_UL_TBF); } -static int compute_usage_for_algo_a(struct gprs_rlcmac_pdch *pdch, - enum gprs_rlcmac_tbf_direction dir) +static int compute_usage_for_algo_a(const struct gprs_rlcmac_pdch *pdch, enum gprs_rlcmac_tbf_direction dir) { int usage = pdch->num_tbfs(GPRS_RLCMAC_DL_TBF) + @@ -172,11 +166,19 @@ static int compute_usage_for_algo_a(struct gprs_rlcmac_pdch *pdch, } -static int find_least_busy_pdch(struct gprs_rlcmac_trx *trx, - enum gprs_rlcmac_tbf_direction dir, - uint8_t mask, - int (*fn)(struct gprs_rlcmac_pdch *, enum gprs_rlcmac_tbf_direction dir), - int *free_tfi = 0, int *free_usf = 0) +/*! Return the TS which corresponds to least busy PDCH + * + * \param[in] trx Pointer to TRX object + * \param[in] dir TBF direction + * \param[in] mask set of available timeslots + * \param[in] fn Function pointer to function which computes number of associated TBFs + * \param[out] free_tfi Free TFI + * \param[out] free_usf Free USF + * \returns TS number or -1 if unable to find + */ +static int find_least_busy_pdch(const struct gprs_rlcmac_trx *trx, enum gprs_rlcmac_tbf_direction dir, uint8_t mask, + int (*fn)(const struct gprs_rlcmac_pdch *, enum gprs_rlcmac_tbf_direction dir), + int *free_tfi = 0, int *free_usf = 0) { unsigned ts; int min_used = INT_MAX; @@ -185,7 +187,7 @@ static int find_least_busy_pdch(struct gprs_rlcmac_trx *trx, int min_usf = -1; for (ts = 0; ts < ARRAY_SIZE(trx->pdch); ts++) { - struct gprs_rlcmac_pdch *pdch = &trx->pdch[ts]; + const struct gprs_rlcmac_pdch *pdch = &trx->pdch[ts]; int num_tbfs; int usf = -1; /* must be signed */ int tfi = -1; @@ -255,30 +257,23 @@ static void attach_tbf_to_pdch(struct gprs_rlcmac_pdch *pdch, pdch->attach_tbf(tbf); } -static void assign_uplink_tbf_usf( - struct gprs_rlcmac_pdch *pdch, - struct gprs_rlcmac_ul_tbf *tbf, - int tfi, int8_t usf) +static void assign_uplink_tbf_usf(struct gprs_rlcmac_pdch *pdch, struct gprs_rlcmac_ul_tbf *tbf, uint8_t tfi, int8_t usf) { tbf->m_tfi = tfi; tbf->m_usf[pdch->ts_no] = usf; attach_tbf_to_pdch(pdch, tbf); } -static void assign_dlink_tbf( - struct gprs_rlcmac_pdch *pdch, - struct gprs_rlcmac_dl_tbf *tbf, - int tfi) +static void assign_dlink_tbf(struct gprs_rlcmac_pdch *pdch, struct gprs_rlcmac_dl_tbf *tbf, uint8_t tfi) { tbf->m_tfi = tfi; attach_tbf_to_pdch(pdch, tbf); } -static int find_trx(BTS *bts, const GprsMs *ms, int use_trx) +static int find_trx(const struct gprs_rlcmac_bts *bts_data, const GprsMs *ms, int8_t use_trx) { unsigned trx_no; unsigned ts; - struct gprs_rlcmac_bts *bts_data = bts->bts_data(); /* We must use the TRX currently actively used by an MS */ if (ms && ms->current_trx()) @@ -289,9 +284,9 @@ static int find_trx(BTS *bts, const GprsMs *ms, int use_trx) /* Find the first TRX that has a PDCH with a free UL and DL TFI */ for (trx_no = 0; trx_no < ARRAY_SIZE(bts_data->trx); trx_no += 1) { - struct gprs_rlcmac_trx *trx = &bts_data->trx[trx_no]; + const struct gprs_rlcmac_trx *trx = &bts_data->trx[trx_no]; for (ts = 0; ts < ARRAY_SIZE(trx->pdch); ts++) { - struct gprs_rlcmac_pdch *pdch = &trx->pdch[ts]; + const struct gprs_rlcmac_pdch *pdch = &trx->pdch[ts]; if (!pdch->is_enabled()) continue; @@ -308,32 +303,41 @@ static int find_trx(BTS *bts, const GprsMs *ms, int use_trx) return -EBUSY; } -static struct gprs_rlcmac_pdch * find_idle_pdch(BTS *bts) +static bool idle_pdch_avail(const struct gprs_rlcmac_bts *bts_data) { unsigned trx_no; unsigned ts; - struct gprs_rlcmac_bts *bts_data = bts->bts_data(); /* Find the first PDCH with an unused DL TS */ for (trx_no = 0; trx_no < ARRAY_SIZE(bts_data->trx); trx_no += 1) { - struct gprs_rlcmac_trx *trx = &bts_data->trx[trx_no]; + const struct gprs_rlcmac_trx *trx = &bts_data->trx[trx_no]; for (ts = 0; ts < ARRAY_SIZE(trx->pdch); ts++) { - struct gprs_rlcmac_pdch *pdch = &trx->pdch[ts]; + const struct gprs_rlcmac_pdch *pdch = &trx->pdch[ts]; if (!pdch->is_enabled()) continue; if (pdch->num_tbfs(GPRS_RLCMAC_DL_TBF) > PDCH_IDLE_TBF_THRESH) continue; - return pdch; + return true; } } - return NULL; + return false; } -static int tfi_find_free(BTS *bts, const GprsMs *ms, - enum gprs_rlcmac_tbf_direction dir, int use_trx, int *trx_no_) +/*! Return free TFI + * + * \param[in] bts Pointer to BTS struct + * \param[in] trx Pointer to TRX struct + * \param[in] ms Pointer to MS object + * \param[in] dir DL or UL direction + * \param[in] use_trx which TRX to use or -1 if it should be selected based on what MS uses + * \param[out] trx_no_ TRX number on which TFI was found + * \returns negative error code or 0 on success + */ +static int tfi_find_free(const BTS *bts, const gprs_rlcmac_trx *trx, const GprsMs *ms, + enum gprs_rlcmac_tbf_direction dir, int8_t use_trx, uint8_t *trx_no_) { int tfi; uint8_t trx_no; @@ -380,7 +384,7 @@ int alloc_algorithm_a(struct gprs_rlcmac_bts *bts, GprsMs *ms_, struct gprs_rlcm LOGP(DRLCMAC, LOGL_DEBUG, "Slot Allocation (Algorithm A) for class " "%d\n", tbf->ms_class()); - trx_no = find_trx(bts->bts, ms, use_trx); + trx_no = find_trx(bts, ms, use_trx); if (trx_no < 0) { LOGP(DRLCMAC, LOGL_NOTICE, "- Failed to find a usable TRX (TFI exhausted)\n"); @@ -448,6 +452,14 @@ int alloc_algorithm_a(struct gprs_rlcmac_bts *bts, GprsMs *ms_, struct gprs_rlcm return 0; } +/*! Find set of slots available for allocation while taking MS class into account + * + * \param[in] trx Pointer to TRX object + * \param[in] mslot_class The multislot class + * \param[in,out] ul_slots set of UL timeslots + * \param[in,out] dl_slots set of DL timeslots + * \returns negative error code or 0 on success + */ int find_multi_slots(struct gprs_rlcmac_trx *trx, uint8_t mslot_class, uint8_t *ul_slots, uint8_t *dl_slots) { uint8_t Tx, Sum; /* Maximum Number of Slots: RX, Tx, Sum Rx+Tx */ @@ -681,7 +693,7 @@ int find_multi_slots(struct gprs_rlcmac_trx *trx, uint8_t mslot_class, uint8_t * for (ts = 0; ts < ARRAY_SIZE(trx->pdch); ts++) { int c; - struct gprs_rlcmac_pdch *pdch = &trx->pdch[ts]; + const struct gprs_rlcmac_pdch *pdch = &trx->pdch[ts]; if (rx_window & (1 << ts)) { c = 32 - pdch->num_reserved(GPRS_RLCMAC_DL_TBF); c = OSMO_MAX(c, 1); @@ -751,14 +763,13 @@ int alloc_algorithm_b(struct gprs_rlcmac_bts *bts, GprsMs *ms_, struct gprs_rlcm uint8_t reserved_ul_slots; int8_t first_common_ts; uint8_t slotcount = 0; - uint8_t avail_count = 0; + uint8_t avail_count = 0, trx_no; char slot_info[9] = {0}; int ts; int first_ts = -1; int usf[8] = {-1, -1, -1, -1, -1, -1, -1, -1}; int rc; int tfi; - int trx_no; const GprsMs *ms = ms_; const gprs_rlcmac_tbf *tbf = tbf_; gprs_rlcmac_trx *trx; @@ -786,7 +797,7 @@ int alloc_algorithm_b(struct gprs_rlcmac_bts *bts, GprsMs *ms_, struct gprs_rlcm } /* Step 2a: Find usable TRX and TFI */ - tfi = tfi_find_free(bts->bts, ms, tbf->direction, use_trx, &trx_no); + tfi = tfi_find_free(bts->bts, trx, ms, tbf->direction, use_trx, &trx_no); if (tfi < 0) { LOGP(DRLCMAC, LOGL_NOTICE, "- Failed to allocate a TFI\n"); return tfi; @@ -986,7 +997,7 @@ int alloc_algorithm_dynamic(struct gprs_rlcmac_bts *bts, GprsMs *ms_, struct gpr /* Reset load_is_high if there is at least one idle PDCH */ if (bts->multislot_disabled) { - bts->multislot_disabled = find_idle_pdch(bts->bts) == NULL; + bts->multislot_disabled = !idle_pdch_avail(bts); if (!bts->multislot_disabled) LOGP(DRLCMAC, LOGL_DEBUG, "Enabling algorithm B\n"); } |