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/include/openbsc/mgcp.h b/openbsc/include/openbsc/mgcp.h
index fb16cb4..9befa7c 100644
--- a/openbsc/include/openbsc/mgcp.h
+++ b/openbsc/include/openbsc/mgcp.h
@@ -227,6 +227,10 @@
int osmux_batch_size;
/* osmux port */
uint16_t osmux_port;
+ /* Pad circuit with dummy messages until we see the first voice
+ * message.
+ */
+ uint16_t osmux_dummy;
};
/* config management */
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);
diff --git a/openbsc/src/libmgcp/mgcp_vty.c b/openbsc/src/libmgcp/mgcp_vty.c
index dd21a15..8f6b10a 100644
--- a/openbsc/src/libmgcp/mgcp_vty.c
+++ b/openbsc/src/libmgcp/mgcp_vty.c
@@ -144,6 +144,8 @@
g_cfg->osmux_batch_size, VTY_NEWLINE);
vty_out(vty, " osmux port %u%s",
g_cfg->osmux_port, VTY_NEWLINE);
+ vty_out(vty, " osmux dummy %s%s",
+ g_cfg->osmux_dummy ? "on" : "off", VTY_NEWLINE);
}
return CMD_SUCCESS;
}
@@ -1245,6 +1247,19 @@
return CMD_SUCCESS;
}
+DEFUN(cfg_mgcp_osmux_dummy,
+ cfg_mgcp_osmux_dummy_cmd,
+ "osmux dummy (on|off)",
+ OSMUX_STR "Enable dummy padding\n" "Disable dummy padding\n")
+{
+ if (strcmp(argv[0], "on") == 0)
+ g_cfg->osmux_dummy = 1;
+ else if (strcmp(argv[0], "off") == 0)
+ g_cfg->osmux_dummy = 0;
+
+ return CMD_SUCCESS;
+}
+
int mgcp_vty_init(void)
{
install_element_ve(&show_mgcp_cmd);
@@ -1304,6 +1319,7 @@
install_element(MGCP_NODE, &cfg_mgcp_osmux_batch_factor_cmd);
install_element(MGCP_NODE, &cfg_mgcp_osmux_batch_size_cmd);
install_element(MGCP_NODE, &cfg_mgcp_osmux_port_cmd);
+ install_element(MGCP_NODE, &cfg_mgcp_osmux_dummy_cmd);
install_element(MGCP_NODE, &cfg_mgcp_allow_transcoding_cmd);
install_element(MGCP_NODE, &cfg_mgcp_no_allow_transcoding_cmd);