tbf_dl: factor out EGPRS DL window size calculation
A subsequent patch needs to call this from gprs_rlcmac_tbf::update(),
so to avoid code dup, put the calculation in a separate function.
Related: OS#1808
Change-Id: I7c7777d43f843bbd3421503fc2a8600f148ca035
diff --git a/src/tbf_dl.cpp b/src/tbf_dl.cpp
index 489020b..457f2c9 100644
--- a/src/tbf_dl.cpp
+++ b/src/tbf_dl.cpp
@@ -1322,3 +1322,23 @@
/* Non SPB cases 0 is reurned */
return EGPRS_RLCMAC_DL_NO_RETX;
}
+
+void gprs_rlcmac_dl_tbf::egprs_calc_window_size()
+{
+ struct gprs_rlcmac_bts *bts_data = bts->bts_data();
+ unsigned int num_pdch = pcu_bitcount(dl_slots());
+ unsigned int ws = bts_data->ws_base + num_pdch * bts_data->ws_pdch;
+
+ ws = (ws / 32) * 32;
+ ws = OSMO_MAX(64, ws);
+
+ if (num_pdch == 1)
+ ws = OSMO_MIN(192, ws);
+ else
+ ws = OSMO_MIN(128 * num_pdch, ws);
+
+ LOGP(DRLCMAC, LOGL_INFO, "%s: Setting EGPRS window size to %d\n",
+ name(), ws);
+
+ m_window.set_ws(ws);
+}