osmux: add option to pad the circuit with dummy messages
Iridium is a satellite network which operates a GPRS-like that allows you to
get speeds up to 128kbit/s. However, it takes from 5 to 6 secs to get the
bandwidth allocated, so the conversation is garbled during the time.
This patch uses the new dummy padding support in libosmo-netif that is
controlled through the osmux osmux_xfrm_input_open_circuit().
This includes a new VTY option for osmux.
diff --git a/openbsc/src/libmgcp/mgcp_osmux.c b/openbsc/src/libmgcp/mgcp_osmux.c
index 7f61173..90b7368 100644
--- a/openbsc/src/libmgcp/mgcp_osmux.c
+++ b/openbsc/src/libmgcp/mgcp_osmux.c
@@ -462,6 +462,12 @@
LOGP(DMGCP, LOGL_ERROR, "Cannot allocate input osmux handle\n");
return -1;
}
+ if (!osmux_xfrm_input_open_circuit(endp->osmux.in, endp->osmux.cid,
+ endp->cfg->osmux_dummy)) {
+ LOGP(DMGCP, LOGL_ERROR, "Cannot open osmux circuit %u\n",
+ endp->osmux.cid);
+ return -1;
+ }
switch (endp->cfg->role) {
case MGCP_BSC_NAT:
@@ -480,6 +486,7 @@
{
LOGP(DMGCP, LOGL_INFO, "Releasing endpoint %u using Osmux CID %u\n",
ENDPOINT_NUMBER(endp), endp->osmux.cid);
+ osmux_xfrm_input_close_circuit(endp->osmux.in, endp->osmux.cid);
endp->osmux.state = OSMUX_STATE_DISABLED;
endp->osmux.cid = -1;
osmux_handle_put(endp->osmux.in);