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pespin has uploaded this change for review. ( https://gerrit.osmocom.org/c/osmo-pcu/+/33120 )
Change subject: Error trying to obtain FN from RFN if curr_fn not known ......................................................................
Error trying to obtain FN from RFN if curr_fn not known
This may happen if a RACH.ind is received before any DATA.ind has been received. With usual osmo-bts-trx or osmo-bts-sysmo, this shouldn't happen nowadays, but it is still a problem with osmo-bts-virtual, where lower layers don't submit NOPE.ind in the absence of data, and hence it won't sent DATA.ind to osmo-pcu all the time.
This change helps in showcasing confusing scenarios where the RFN generated in the Imm Ass was wrong.
Change-Id: I29b7ba828fe890f90e35686bbb04d4abfe56b955 --- M src/bts.cpp 1 file changed, 30 insertions(+), 4 deletions(-)
git pull ssh://gerrit.osmocom.org:29418/osmo-pcu refs/changes/20/33120/1
diff --git a/src/bts.cpp b/src/bts.cpp index 8d6f156..6cac93f 100644 --- a/src/bts.cpp +++ b/src/bts.cpp @@ -740,20 +740,27 @@ /* Determine the full frame number from a relative frame number */ uint32_t bts_rfn_to_fn(const struct gprs_rlcmac_bts *bts, uint32_t rfn) { - uint32_t m_cur_rfn; + uint32_t m_cur_fn, m_cur_rfn; uint32_t fn_rounded;
/* Ensure that all following calculations are performed with the * relative frame number */ OSMO_ASSERT(rfn < RFN_MODULUS);
+ m_cur_fn = bts_current_frame_number(bts); + if (m_cur_fn == FN_UNSET) { + LOGP(DRLCMAC, LOGL_ERROR, "Unable to calculate full FN from RFN %u: Current FN not known!\n", + rfn); + return rfn; + } + /* Compute an internal relative frame number from the full internal frame number */ - m_cur_rfn = fn2rfn(bts->cur_fn); + m_cur_rfn = fn2rfn(m_cur_fn);
/* Compute a "rounded" version of the internal frame number, which * exactly fits in the RFN_MODULUS raster */ - fn_rounded = GSM_TDMA_FN_SUB(bts->cur_fn, m_cur_rfn); + fn_rounded = GSM_TDMA_FN_SUB(m_cur_fn, m_cur_rfn);
/* If the delta between the internal and the external relative frame * number exceeds a certain limit, we need to assume that the incoming @@ -762,7 +769,7 @@ if (GSM_TDMA_FN_DIFF(rfn, m_cur_rfn) > RFN_THRESHOLD) { LOGP(DRLCMAC, LOGL_DEBUG, "Race condition between rfn (%u) and m_cur_fn (%u) detected: rfn belongs to the previous modulus %u cycle, wrapping...\n", - rfn, bts->cur_fn, RFN_MODULUS); + rfn, m_cur_fn, RFN_MODULUS); if (fn_rounded < RFN_MODULUS) { LOGP(DRLCMAC, LOGL_DEBUG, "Cornercase detected: wrapping crosses %u border\n",
-
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