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Outgoing BRI calls fail when using Asterisk 1.8 with HA8, HB8, and B410P cards.

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France Telecom brings layer 2 and layer 1 down on BRI lines when the line
is idle.  When layer 1 goes down Asterisk cannot make outgoing calls and
the HA8 and HB8 cards also get IRQ misses.

The inability to make outgoing calls is because the line is in red alarm
and Asterisk will not make calls over a line it considers unavailable.
The IRQ misses for the HA8 and HB8 card are because the hardware is
switching clock sources from the line which just brought layer 1 down to
internal timing.

There is a DAHDI option for the B410P card to not tell Asterisk that layer
1 went down so Asterisk will allow outgoing calls: "modprobe wcb4xxp
teignored=1".  There is a similar DAHDI option for the HA8 and HB8 cards:
"modprobe wctdm24xxp bri_teignored=1".  Unfortunately that will not clear
up the IRQ misses when the telco brings layer 1 down.

* Add layer 2 persistence option to customize the layer 2 behavior on BRI
PTMP lines.  The new option has three settings: 1) Use libpri default
layer 2 setting.  2) Keep layer 2 up.  Bring layer 2 back up when the peer
brings it down.  3) Leave layer 2 down when the peer brings it down.
Layer 2 will be brought up as needed for outgoing calls.

(issue AST-598)
Reported by: Trey Blancher


git-svn-id: https://origsvn.digium.com/svn/libpri/branches/1.4@2273 2fbb986a-6c06-0410-b554-c9c1f0a7f128
remotes/origin/1.4
Richard Mudgett 13 years ago
parent 092811da55
commit c5ec479bd2
5 changed files with 187 additions and 27 deletions
Show Stats Download Patch File Download Diff File

25
libpri.h
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@ -1892,6 +1892,31 @@ int pri_transfer_rsp(struct pri *ctrl, q931_call *call, int invoke_id, int is_su
*/
void pri_aoc_events_enable(struct pri *ctrl, int enable);
enum pri_layer2_persistence {
PRI_L2_PERSISTENCE_DEFAULT,
/*! Immediately bring layer 2 back up if the peer brings layer 2 down. */
PRI_L2_PERSISTENCE_KEEP_UP,
/*! Leave layer 2 down if the peer brings layer 2 down. */
PRI_L2_PERSISTENCE_LEAVE_DOWN,
#if 0 /* Possible future option. Would need to define how long to idle before dropping. */
/*! Drop layer 2 on D channel idle. */
PRI_L2_PERSISTENCE_IDLE_DROP,
#endif
};
/*!
* \brief Set the layer2 persistence option.
*
* \param ctrl D channel controller.
* \param option Layer 2 persistence to apply.
*
* \note
* Not all values are supported by all modes.
*
* \return Nothing
*/
void pri_persistent_layer2_option(struct pri *ctrl, enum pri_layer2_persistence option);
#define PRI_DISPLAY_OPTION_BLOCK (1 << 0) /*!< Do not pass display text. */
#define PRI_DISPLAY_OPTION_NAME_INITIAL (1 << 1) /*!< Use display in SETUP/CONNECT for name. */
#define PRI_DISPLAY_OPTION_NAME_UPDATE (1 << 2) /*!< Use display in FACILITY/NOTIFY for COLP name if appropriate. */

43
pri.c
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@ -290,6 +290,27 @@ static int __pri_write(struct pri *pri, void *buf, int buflen)
return res;
}
/*!
* \internal
* \brief Determine the default layer 2 persistence option.
*
* \param ctrl D channel controller.
*
* \return Default layer 2 persistence option. (legacy behaviour default)
*/
static enum pri_layer2_persistence pri_l2_persistence_option_default(struct pri *ctrl)
{
enum pri_layer2_persistence persistence;
if (PTMP_MODE(ctrl)) {
persistence = PRI_L2_PERSISTENCE_LEAVE_DOWN;
} else {
persistence = PRI_L2_PERSISTENCE_KEEP_UP;
}
return persistence;
}
/*!
* \internal
* \brief Determine the default display text send options.
@ -558,6 +579,7 @@ static struct pri *pri_ctrl_new(int fd, int node, int switchtype, pri_io_cb rd,
ctrl->q931_rxcount = 0;
ctrl->q931_txcount = 0;
ctrl->l2_persistence = pri_l2_persistence_option_default(ctrl);
ctrl->display_flags.send = pri_display_options_send_default(ctrl);
ctrl->display_flags.receive = pri_display_options_receive_default(ctrl);
switch (switchtype) {
@ -2165,6 +2187,27 @@ void pri_cc_retain_signaling_rsp(struct pri *ctrl, int signaling_retention)
}
}
void pri_persistent_layer2_option(struct pri *ctrl, enum pri_layer2_persistence option)
{
if (!ctrl) {
return;
}
if (PTMP_MODE(ctrl)) {
switch (option) {
case PRI_L2_PERSISTENCE_DEFAULT:
ctrl->l2_persistence = pri_l2_persistence_option_default(ctrl);
break;
case PRI_L2_PERSISTENCE_KEEP_UP:
case PRI_L2_PERSISTENCE_LEAVE_DOWN:
ctrl->l2_persistence = option;
break;
}
if (ctrl->l2_persistence == PRI_L2_PERSISTENCE_KEEP_UP) {
q921_bring_layer2_up(ctrl);
}
}
}
void pri_display_options_send(struct pri *ctrl, unsigned long flags)
{
if (!ctrl) {

2
pri_internal.h
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@ -120,6 +120,8 @@ struct pri {
/*! Layer 2 link control for D channel. */
struct q921_link link;
/*! Layer 2 persistence option. */
enum pri_layer2_persistence l2_persistence;
/*! T201 TEI Identity Check timer. */
int t201_timer;
/*! Number of times T201 has expired. */

3
pri_q921.h
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@ -252,7 +252,7 @@ struct q921_link {
int n202_counter;
/*! Max idle time */
int t203_timer;
/*! PTP restart delay timer */
/*! Layer 2 persistence restart delay timer */
int restart_timer;
/* MDL variables */
@ -277,6 +277,7 @@ extern void q921_dump(struct pri *pri, q921_h *h, int len, int showraw, int txrx
/* Bring up the D-channel */
void q921_start(struct q921_link *link);
void q921_bring_layer2_up(struct pri *ctrl);
//extern void q921_reset(struct pri *pri, int reset_iqueue);

141
q921.c
Unescape View File

@ -235,7 +235,10 @@ static void t202_expire(void *vlink)
link->t202_timer =
pri_schedule_event(ctrl, ctrl->timers[PRI_TIMER_T202], t202_expire, link);
++link->n202_counter;
if (ctrl->l2_persistence != PRI_L2_PERSISTENCE_KEEP_UP) {
/* Only try to get a TEI for N202 times if layer 2 is not persistent. */
++link->n202_counter;
}
if (!link->t202_timer || link->n202_counter > ctrl->timers[PRI_TIMER_N202]) {
if (!link->t202_timer) {
pri_error(ctrl, "Could not start T202 timer.");
@ -530,26 +533,62 @@ static void stop_t200(struct q921_link *link)
}
}
static void restart_timer_expire(void *vlink)
/*!
* \internal
* \brief Initiate bringing up layer 2 link.
*
* \param link Layer 2 link to bring up.
*
* \return Nothing
*/
static void kick_start_link(struct q921_link *link)
{
struct q921_link *link = vlink;
struct pri *ctrl;
ctrl = link->ctrl;
if (ctrl->debug & PRI_DEBUG_Q921_STATE) {
pri_message(ctrl, "SAPI/TEI=%d/%d Kick starting link\n", link->sapi, link->tei);
switch (link->state) {
case Q921_TEI_UNASSIGNED:
if (ctrl->debug & PRI_DEBUG_Q921_STATE) {
pri_message(ctrl, "Kick starting link from no TEI.\n");
}
q921_setstate(link, Q921_ESTABLISH_AWAITING_TEI);
q921_tei_request(link);
break;
case Q921_ASSIGN_AWAITING_TEI:
if (ctrl->debug & PRI_DEBUG_Q921_STATE) {
pri_message(ctrl, "Kick starting link when get TEI.\n");
}
q921_setstate(link, Q921_ESTABLISH_AWAITING_TEI);
break;
case Q921_TEI_ASSIGNED:
if (ctrl->debug & PRI_DEBUG_Q921_STATE) {
pri_message(ctrl, "SAPI/TEI=%d/%d Kick starting link\n", link->sapi,
link->tei);
}
q921_discard_iqueue(link);
q921_establish_data_link(link);
link->l3_initiated = 1;
q921_setstate(link, Q921_AWAITING_ESTABLISHMENT);
break;
default:
break;
}
}
static void restart_timer_expire(void *vlink)
{
struct q921_link *link = vlink;
struct pri *ctrl;
ctrl = link->ctrl;
link->restart_timer = 0;
switch (link->state) {
case Q921_TEI_ASSIGNED:
/* Try to bring layer 2 up. */
q921_discard_iqueue(link);
q921_establish_data_link(link);
link->l3_initiated = 1;
q921_setstate(link, Q921_AWAITING_ESTABLISHMENT);
kick_start_link(link);
break;
default:
/* Looks like someone forgot to stop the restart timer. */
@ -568,6 +607,7 @@ static void restart_timer_stop(struct q921_link *link)
link->restart_timer = 0;
}
/*! \note Only call on the transition to state Q921_TEI_ASSIGNED or already there. */
static void restart_timer_start(struct q921_link *link)
{
struct pri *ctrl;
@ -583,21 +623,27 @@ static void restart_timer_start(struct q921_link *link)
pri_schedule_event(ctrl, ctrl->timers[PRI_TIMER_T200], restart_timer_expire, link);
}
static pri_event *q921_ptp_delay_restart(struct q921_link *link)
/*! \note Only call on the transition to state Q921_TEI_ASSIGNED or already there. */
static pri_event *q921_check_delay_restart(struct q921_link *link)
{
pri_event *ev;
struct pri *ctrl;
ctrl = link->ctrl;
if (PTP_MODE(ctrl)) {
if (ctrl->l2_persistence == PRI_L2_PERSISTENCE_KEEP_UP) {
/*
* For PTP links:
* This is where we act a bit like L3 instead of L2, since we've
* got an L3 that depends on us keeping L2 automatically alive
* and happy for PTP links.
* and happy.
*
* For PTMP links:
* We can optionally keep L2 automatically alive and happy.
*/
restart_timer_start(link);
}
if (PTP_MODE(ctrl)) {
switch (link->state) {
case Q921_MULTI_FRAME_ESTABLISHED:
case Q921_TIMER_RECOVERY:
@ -616,6 +662,31 @@ static pri_event *q921_ptp_delay_restart(struct q921_link *link)
return ev;
}
/*!
* \brief Bring all layer 2 links up.
*
* \param ctrl D channel controller.
*
* \return Nothing
*/
void q921_bring_layer2_up(struct pri *ctrl)
{
struct q921_link *link;
if (PTMP_MODE(ctrl)) {
/* Don't start with the broadcast link. */
link = ctrl->link.next;
} else {
link = &ctrl->link;
}
for (; link; link = link->next) {
if (!link->restart_timer) {
/* A restart on the link is not already in the works. */
kick_start_link(link);
}
}
}
/* This is the equivalent of the I-Frame queued up path in Figure B.7 in MULTI_FRAME_ESTABLISHED */
static int q921_send_queued_iframes(struct q921_link *link)
{
@ -859,7 +930,7 @@ static void t200_expire(void *vlink)
q921_send_sabme(link);
start_t200(link);
} else {
q921_ptp_delay_restart(link);
q921_check_delay_restart(link);
q921_discard_iqueue(link);
q921_mdl_error(link, 'G');
q921_setstate(link, Q921_TEI_ASSIGNED);
@ -873,7 +944,7 @@ static void t200_expire(void *vlink)
q921_send_disc(link, 1);
start_t200(link);
} else {
q921_ptp_delay_restart(link);
q921_check_delay_restart(link);
q921_mdl_error(link, 'H');
/* DL-RELEASE confirm */
q931_dl_event(link, Q931_DL_EVENT_DL_RELEASE_CONFIRM);
@ -1471,12 +1542,13 @@ static pri_event *q921_receive_MDL(struct pri *ctrl, q921_u *h, int len)
if (ctrl->debug & PRI_DEBUG_Q921_STATE) {
pri_message(ctrl, "Allocating new TEI %d\n", tei);
}
sub->next = pri_link_new(ctrl, Q921_SAPI_CALL_CTRL, tei);
if (!sub->next) {
link = pri_link_new(ctrl, Q921_SAPI_CALL_CTRL, tei);
if (!link) {
pri_error(ctrl, "Unable to allocate layer 2 link for new TEI %d\n", tei);
return NULL;
}
q921_setstate(sub->next, Q921_TEI_ASSIGNED);
sub->next = link;
q921_setstate(link, Q921_TEI_ASSIGNED);
q921_send_tei(ctrl, Q921_TEI_IDENTITY_ASSIGNED, ri, tei, 1);
count = 0;
@ -1493,6 +1565,15 @@ static pri_event *q921_receive_MDL(struct pri *ctrl, q921_u *h, int len)
}
q921_tei_check(ctrl);
}
if (ctrl->l2_persistence == PRI_L2_PERSISTENCE_KEEP_UP) {
/*
* Layer 2 is persistent so give the peer some time to setup
* it's new TEI and bring the link up itself before we bring the
* link up.
*/
restart_timer_start(link);
}
break;
case Q921_TEI_IDENTITY_CHECK_RESPONSE:
if (!BRI_NT_PTMP(ctrl)) {
@ -1562,7 +1643,12 @@ static pri_event *q921_receive_MDL(struct pri *ctrl, q921_u *h, int len)
switch (link->state) {
case Q921_TEI_UNASSIGNED:
/* We do not have a TEI and we are not asking for one. */
/*
* We do not have a TEI and we are not currently asking for one.
* Start asking for one.
*/
q921_setstate(link, Q921_ASSIGN_AWAITING_TEI);
q921_tei_request(link);
return NULL;
case Q921_ASSIGN_AWAITING_TEI:
case Q921_ESTABLISH_AWAITING_TEI:
@ -1604,9 +1690,12 @@ static pri_event *q921_receive_MDL(struct pri *ctrl, q921_u *h, int len)
switch (link->state) {
case Q921_ASSIGN_AWAITING_TEI:
q921_setstate(link, Q921_TEI_ASSIGNED);
ctrl->ev.gen.e = PRI_EVENT_DCHAN_UP;
res = &ctrl->ev;
break;
if (ctrl->l2_persistence != PRI_L2_PERSISTENCE_KEEP_UP) {
ctrl->ev.gen.e = PRI_EVENT_DCHAN_UP;
res = &ctrl->ev;
break;
}
/* Fall through: Layer 2 is persistent so bring it up. */
case Q921_ESTABLISH_AWAITING_TEI:
q921_establish_data_link(link);
link->l3_initiated = 1;
@ -1765,7 +1854,7 @@ static pri_event *q921_disc_rx(struct q921_link *link, q921_h *h)
break;
case Q921_MULTI_FRAME_ESTABLISHED:
case Q921_TIMER_RECOVERY:
res = q921_ptp_delay_restart(link);
res = q921_check_delay_restart(link);
q921_discard_iqueue(link);
q921_send_ua(link, h->u.p_f);
/* DL-RELEASE indication */
@ -2177,7 +2266,7 @@ static pri_event *q921_ua_rx(struct q921_link *link, q921_h *h)
if (!h->u.p_f) {
q921_mdl_error(link, 'D');
} else {
res = q921_ptp_delay_restart(link);
res = q921_check_delay_restart(link);
/* DL-RELEASE confirm */
q931_dl_event(link, Q931_DL_EVENT_DL_RELEASE_CONFIRM);
stop_t200(link);
@ -2615,7 +2704,7 @@ static pri_event *q921_dm_rx(struct q921_link *link, q921_h *h)
if (!h->u.p_f)
break;
res = q921_ptp_delay_restart(link);
res = q921_check_delay_restart(link);
q921_discard_iqueue(link);
/* DL-RELEASE indication */
q931_dl_event(link, Q931_DL_EVENT_DL_RELEASE_IND);
@ -2625,7 +2714,7 @@ static pri_event *q921_dm_rx(struct q921_link *link, q921_h *h)
case Q921_AWAITING_RELEASE:
if (!h->u.p_f)
break;
res = q921_ptp_delay_restart(link);
res = q921_check_delay_restart(link);
/* DL-RELEASE confirm */
q931_dl_event(link, Q931_DL_EVENT_DL_RELEASE_CONFIRM);
stop_t200(link);

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