Review at  https://gerrit.osmocom.org/7823

trigger acc ramping on state-changed-event reports

Trigger ACC ramping not only when an Administrative State Change
ACK is received from a BTS, but also when an administrative state
change is reported for TRX 0 in a State Changed Event Report.

This should allow ACC ramping to work with any BTS which reports
an administrative state change to 'unlock' using either of these
OML messages.

Tested with a sysmobts and a nanobts.

The sysmobts only reports TRX locked/unlock changes in Administrative
State Change ACKs, not via State Changed Event Reports.

The nanobts is known to send both of these OML messages in quick
succession, so do not re-trigger ramping if it's already in progress.

This is a port of osmo-bsc commit b06c7a253752ecb67fd20cdf0b069688b561af0e

Change-Id: I6443635b822b6cd776f6dc8a6ee73ab09e865b04
Related: OS#2591
---
M openbsc/src/libbsc/acc_ramp.c
1 file changed, 10 insertions(+), 2 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/openbsc refs/changes/23/7823/1

diff --git a/openbsc/src/libbsc/acc_ramp.c b/openbsc/src/libbsc/acc_ramp.c
index 03ba80b..a866458 100644
--- a/openbsc/src/libbsc/acc_ramp.c
+++ b/openbsc/src/libbsc/acc_ramp.c
@@ -144,7 +144,8 @@
        struct acc_ramp *acc_ramp = handler_data;
        struct gsm_bts_trx *trx = NULL;
 
-       if (signal != S_NM_STATECHG_ADM)
+       /* Handled signals map to an Administrative State Change ACK, or a 
State Changed Event Report. */
+       if (signal != S_NM_STATECHG_ADM && signal != S_NM_STATECHG_OPER)
                return 0;
 
        if (nsd->obj_class != NM_OC_RADIO_CARRIER)
@@ -163,7 +164,14 @@
        /* Trigger or abort ACC ramping based on the new 'RF lock' state of 
this TRX. */
        switch (nsd->new_state->administrative) {
        case NM_STATE_UNLOCKED:
-               acc_ramp_trigger(acc_ramp);
+               /*
+                * Do not re-trigger ACC ramping if ramping is already in 
progress.
+                * A BTS might send several "unlock" change events: One in the 
Administrative
+                * State Change ACK, and/or another in a State Changed Event 
Report.
+                * For instance, the nanobts is known to send both.
+                */
+               if (!osmo_timer_pending(&acc_ramp->step_timer))
+                       acc_ramp_trigger(acc_ramp);
                break;
        case NM_STATE_LOCKED:
        case NM_STATE_SHUTDOWN:

-- 
To view, visit https://gerrit.osmocom.org/7823
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Gerrit-MessageType: newchange
Gerrit-Change-Id: I6443635b822b6cd776f6dc8a6ee73ab09e865b04
Gerrit-PatchSet: 1
Gerrit-Project: openbsc
Gerrit-Branch: master
Gerrit-Owner: Stefan Sperling <ssperl...@sysmocom.de>

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