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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.
This commit is contained in:
Pablo Neira Ayuso 2015-07-17 21:56:23 +02:00 committed by Pablo Neira Ayuso
parent ecff2424e5
commit 57e95a22f0
3 changed files with 27 additions and 0 deletions
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4
openbsc/include/openbsc/mgcp.h
View File

@ -227,6 +227,10 @@ struct mgcp_config {
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 */

7
openbsc/src/libmgcp/mgcp_osmux.c
View File

@ -462,6 +462,12 @@ int osmux_enable_endpoint(struct mgcp_endpoint *endp, int role,
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 @@ void osmux_disable_endpoint(struct mgcp_endpoint *endp)
{
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);

16
openbsc/src/libmgcp/mgcp_vty.c
View File

@ -144,6 +144,8 @@ static int config_write_mgcp(struct vty *vty)
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 @@ DEFUN(cfg_mgcp_osmux_port,
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 @@ int mgcp_vty_init(void)
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);