alloc_algorithm_a

Vladimir Rolbin vrolbin at gmail.com
Wed Sep 25 11:39:55 UTC 2013


I paid attention that when mode "a" used ( 1 ts configuration)  0  is the
only usf value allocated in spite of two MSs are involved in the test. I
understand that it may be OK if they haven't opened UL TBFs at the same
time, but analyzing the source code I didn't find that the local variable
usf after getting value delivers it further to   tbf->dir.ul.usf[ts] or I'm
missing something. I'll try the patch later (in several days).

Regards,
Vladimir Rolbin




On Wed, Sep 25, 2013 at 1:11 PM, Holger Hans Peter Freyther <
hfreyther at sysmocom.de> wrote:

> On Tue, Sep 24, 2013 at 01:26:17PM +0300, Vladimir Rolbin wrote:
> > Hi all,
> >
> > It looks like usf found (allocated) is never used. I guess something
> > like tbf->dir.ul.usf[ts] = usf is missed.
>
> Hi!
>
> can you indicate on how to re-produce the problem and how much time
> you have spent in analyzing this problem? I have indicated the lack
> of test cases in the past.
>
> I moved the "assignment" (having to pass trx, bts, pdch, ts just
> indicates the lack of structure in this code...) into a new method.
> It kills code duplication and could fix the issue. I have only compile
> tested it. Could you give it a try?
>
> holger
>
>
>
> diff --git a/src/gprs_rlcmac.cpp b/src/gprs_rlcmac.cpp
> index 1d1a8c6..695bf47 100644
> --- a/src/gprs_rlcmac.cpp
> +++ b/src/gprs_rlcmac.cpp
> @@ -402,6 +402,17 @@ next_diagram:
>         return tbf;
>  }
>
> +static void assign_uplink_tbf_usf(struct gprs_rlcmac_bts *bts,
> +                               struct gprs_rlcmac_pdch *pdch,
> +                               int ts,
> +                               struct gprs_rlcmac_tbf *tbf, int8_t usf)
> +{
> +       bts->trx[tbf->trx].ul_tbf[tbf->tfi] = tbf;
> +       pdch->ul_tbf[tbf->tfi] = tbf;
> +       tbf->pdch[ts] = pdch;
> +       tbf->dir.ul.usf[ts] = usf;
> +}
> +
>  /* Slot Allocation: Algorithm A
>   *
>   * Assign single slot for uplink and downlink
> @@ -433,17 +444,14 @@ int alloc_algorithm_a(struct gprs_rlcmac_bts *bts,
>         if (tbf->direction == GPRS_RLCMAC_UL_TBF) {
>                 /* if USF available */
>                 usf = find_free_usf(pdch, ts);
> -               if (usf >= 0) {
> -                       LOGP(DRLCMAC, LOGL_DEBUG, "- Assign uplink "
> -                               "TS=%d USF=%d\n", ts, usf);
> -                       bts->trx[tbf->trx].ul_tbf[tbf->tfi] = tbf;
> -                       pdch->ul_tbf[tbf->tfi] = tbf;
> -                       tbf->pdch[ts] = pdch;
> -               } else {
> +               if (usf < 0) {
>                         LOGP(DRLCMAC, LOGL_NOTICE, "- Failed "
>                                 "allocating TS=%d, no USF available\n",
> ts);
>                         return -EBUSY;
>                 }
> +               LOGP(DRLCMAC, LOGL_DEBUG, "- Assign uplink "
> +                       "TS=%d USF=%d\n", ts, usf);
> +               assign_uplink_tbf_usf(bts, pdch, ts, tbf, usf);
>         } else {
>                 LOGP(DRLCMAC, LOGL_DEBUG, "- Assign downlink TS=%d\n", ts);
>                 bts->trx[tbf->trx].dl_tbf[tbf->tfi] = tbf;
> @@ -859,10 +867,7 @@ int alloc_algorithm_b(struct gprs_rlcmac_bts *bts,
>                                 LOGP(DRLCMAC, LOGL_DEBUG, "- Assigning UL
> TS "
>                                         "%d\n", ts);
>                                 pdch = &bts->trx[tbf->trx].pdch[ts];
> -                               bts->trx[tbf->trx].ul_tbf[tbf->tfi] = tbf;
> -                               pdch->ul_tbf[tbf->tfi] = tbf;
> -                               tbf->pdch[ts] = pdch;
> -                               tbf->dir.ul.usf[ts] = usf[ts];
> +                               assign_uplink_tbf_usf(bts, pdch, ts, tbf,
> usf[ts]);
>                                 slotcount++;
>                                 if (slotcount == 1)
>                                         tbf->first_ts = ts;
>
> --
> - Holger Freyther <hfreyther at sysmocom.de>       http://www.sysmocom.de/
> =======================================================================
> * sysmocom - systems for mobile communications GmbH
> * Schivelbeiner Str. 5
> * 10439 Berlin, Germany
> * Sitz / Registered office: Berlin, HRB 134158 B
> * Geschaeftsfuehrer / Managing Directors: Holger Freyther, Harald Welte
>
>
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