Review at https://gerrit.osmocom.org/185

dyn PDCH: Fix TCH/F+PDCH allocation and direction of chan_alloc()

Always allow TCH/F+PDCH allocation, even if the current PDCH mode is not TCH/F. (This is required to allocate a TCH/F channel with active PDCH, that needs to be deactivated later.)

Fix the reverse search of a free slot ("channel allocator ascending").

Change-Id: Id38386c1e6e201d7e9b1dfeae732641486d28a77 --- M openbsc/src/libbsc/chan_alloc.c 1 file changed, 18 insertions(+), 10 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/openbsc refs/changes/85/185/1

diff --git a/openbsc/src/libbsc/chan_alloc.c b/openbsc/src/libbsc/chan_alloc.c index de9da81..abbe500 100644 --- a/openbsc/src/libbsc/chan_alloc.c +++ b/openbsc/src/libbsc/chan_alloc.c @@ -75,23 +75,31 @@ _lc_find_trx(struct gsm_bts_trx *trx, enum gsm_phys_chan_config pchan) { struct gsm_bts_trx_ts *ts; - int j, ss; + int j, start, stop, dir, ss;

if (!trx_is_usable(trx)) return NULL;

- for (j = 0; j < 8; j++) { + if (trx->bts->chan_alloc_reverse) { + /* check TS 7..0 */ + start = 7; + stop = -1; + dir = -1; + } else { + /* check TS 0..7 */ + start = 0; + stop = 8; + dir = 1; + } + + for (j = start; j != stop; j += dir) { ts = &trx->ts[j]; if (!ts_is_usable(ts)) continue; - /* ip.access dynamic TCH/F + PDCH combination */ - if (ts->pchan == GSM_PCHAN_TCH_F_PDCH && - pchan == GSM_PCHAN_TCH_F) { - /* we can only consider such a dynamic channel - * if the PDCH is currently inactive */ - if (ts->flags & TS_F_PDCH_MODE) - continue; - } else if (ts->pchan != pchan) + /* pchan must match. */ + if (ts->pchan != pchan + && (ts->pchan != GSM_PCHAN_TCH_F_PDCH + || pchan != GSM_PCHAN_TCH_F)) continue; /* check if all sub-slots are allocated yet */ for (ss = 0; ss < subslots_per_pchan[pchan]; ss++) {