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-rw-r--r--src/osmo-bsc/abis_rsl.c2
-rw-r--r--src/osmo-bsc/assignment_fsm.c79
-rw-r--r--src/osmo-bsc/gsm_04_08_rr.c15
-rw-r--r--src/osmo-bsc/lchan_fsm.c153
4 files changed, 206 insertions, 43 deletions
diff --git a/src/osmo-bsc/abis_rsl.c b/src/osmo-bsc/abis_rsl.c
index d3f7de248..03d53c5bf 100644
--- a/src/osmo-bsc/abis_rsl.c
+++ b/src/osmo-bsc/abis_rsl.c
@@ -1186,10 +1186,12 @@ static int abis_rsl_rx_dchan(struct msgb *msg)
case RSL_MT_MODE_MODIFY_ACK:
LOG_LCHAN(msg->lchan, LOGL_DEBUG, "CHANNEL MODE MODIFY ACK\n");
count_codecs(sign_link->trx->bts, msg->lchan);
+ osmo_fsm_inst_dispatch(msg->lchan->fi, LCHAN_EV_RSL_CHAN_MODE_MODIFY_ACK, NULL);
break;
case RSL_MT_MODE_MODIFY_NACK:
LOG_LCHAN(msg->lchan, LOGL_DEBUG, "CHANNEL MODE MODIFY NACK\n");
rate_ctr_inc(&sign_link->trx->bts->bts_ctrs->ctr[BTS_CTR_MODE_MODIFY_NACK]);
+ osmo_fsm_inst_dispatch(msg->lchan->fi, LCHAN_EV_RSL_CHAN_MODE_MODIFY_NACK, NULL);
break;
case RSL_MT_IPAC_PDCH_ACT_ACK:
rc = rsl_rx_ipacc_pdch(msg, "ACT ACK", TS_EV_PDCH_ACT_ACK);
diff --git a/src/osmo-bsc/assignment_fsm.c b/src/osmo-bsc/assignment_fsm.c
index ca29daabb..fde028ed9 100644
--- a/src/osmo-bsc/assignment_fsm.c
+++ b/src/osmo-bsc/assignment_fsm.c
@@ -379,9 +379,8 @@ static int check_requires_voice_stream(struct gsm_subscriber_connection *conn)
return 0;
}
-/* Check if the conn is already associated with an lchan. If yes, we will check
- * if that lchan is compatible with the preferred rate/codec. If the lchan
- * turns out to be incompatible we try with the alternate rate/codec. */
+/* Decide if we should re-use an existing lchan. For this we check if the
+ * current lchan is compatible with one of the requested modes. */
static bool reuse_existing_lchan(struct gsm_subscriber_connection *conn)
{
struct assignment_request *req = &conn->assignment.req;
@@ -395,22 +394,10 @@ static bool reuse_existing_lchan(struct gsm_subscriber_connection *conn)
for (i = 0; i < req->n_ch_mode_rate; i++)
if (lchan_type_compat_with_mode(conn->lchan->type, &req->ch_mode_rate[i])) {
conn->lchan->ch_mode_rate = req->ch_mode_rate[i];
- break;
+ return true;
}
- if (i == req->n_ch_mode_rate)
- return false;
-
- if (conn->lchan->tch_mode != conn->lchan->ch_mode_rate.chan_mode) {
- /* FIXME: send Channel Mode Modify to put the current lchan in the right mode, and kick
- * off its RTP stream setup code path. See gsm48_lchan_modify() and
- * gsm48_rx_rr_modif_ack(), and see lchan_fsm.h LCHAN_EV_CHAN_MODE_MODIF_* */
- LOG_ASSIGNMENT(conn, LOGL_DEBUG,
- "Current lchan would be compatible, but Channel Mode Modify is not implemented\n");
- return false;
- }
-
- return true;
+ return false;
}
void assignment_fsm_start(struct gsm_subscriber_connection *conn, struct gsm_bts *bts,
@@ -447,22 +434,57 @@ void assignment_fsm_start(struct gsm_subscriber_connection *conn, struct gsm_bts
return;
/* There may be an already existing lchan, if yes, try to work with
- * the existing lchan */
+ * the existing lchan. */
if (reuse_existing_lchan(conn)) {
+
+ /* If the requested mode and the current TCH mode matches up, just send the
+ * assignment complete directly and be done with the assignment procedure. */
+ if (conn->lchan->tch_mode == conn->lchan->ch_mode_rate.chan_mode) {
+ LOG_ASSIGNMENT(conn, LOGL_DEBUG,
+ "Current lchan mode is compatible with requested chan_mode,"
+ " sending BSSMAP Assignment Complete directly."
+ " requested chan_mode=%s; current lchan is %s\n",
+ gsm48_chan_mode_name(conn->lchan->ch_mode_rate.chan_mode),
+ gsm_lchan_name(conn->lchan));
+
+ send_assignment_complete(conn);
+ /* If something went wrong during send_assignment_complete(),
+ * the fi will be gone from error handling in there. */
+ if (conn->assignment.fi) {
+ assignment_count_result(CTR_ASSIGNMENT_COMPLETED);
+ osmo_fsm_inst_term(conn->assignment.fi, OSMO_FSM_TERM_REGULAR, 0);
+ }
+ return;
+ }
+
+ /* The requested mode does not match the current TCH mode but the lchan is
+ * compatible. We will initiate a mode modify procedure. */
LOG_ASSIGNMENT(conn, LOGL_DEBUG,
- "Current lchan is compatible with requested chan_mode,"
- " sending BSSMAP Assignment Complete directly."
- " requested chan_mode=%s; current lchan is %s\n",
+ "Current lchan mode is not compatible with requested chan_mode,"
+ " so we will modify it. requested chan_mode=%s; current lchan is %s\n",
gsm48_chan_mode_name(conn->lchan->ch_mode_rate.chan_mode),
gsm_lchan_name(conn->lchan));
- send_assignment_complete(conn);
- /* If something went wrong during send_assignment_complete(), the fi will be gone from
- * error handling in there. */
- if (conn->assignment.fi) {
- assignment_count_result(CTR_ASSIGNMENT_COMPLETED);
- osmo_fsm_inst_term(conn->assignment.fi, OSMO_FSM_TERM_REGULAR, 0);
- }
+ info = (struct lchan_activate_info){
+ .activ_for = FOR_ASSIGNMENT,
+ .for_conn = conn,
+ .chan_mode = conn->lchan->ch_mode_rate.chan_mode,
+ .encr = conn->lchan->encr,
+ .s15_s0 = conn->lchan->ch_mode_rate.s15_s0,
+ .requires_voice_stream = conn->assignment.requires_voice_stream,
+ .msc_assigned_cic = req->msc_assigned_cic,
+ .re_use_mgw_endpoint_from_lchan = conn->lchan,
+ };
+
+ osmo_fsm_inst_dispatch(conn->lchan->fi, LCHAN_EV_REQUEST_MODE_MODIFY, &info);
+
+ /* Since we opted not to allocate a new lchan, the new lchan is still the old lchan. */
+ conn->assignment.new_lchan = conn->lchan;
+
+ /* Also we need to skip the RR assignment, so we jump forward and wait for the lchan_fsm until it
+ * reaches the established state again. */
+ assignment_fsm_state_chg(ASSIGNMENT_ST_WAIT_LCHAN_ESTABLISHED);
+
return;
}
@@ -682,6 +704,7 @@ static const struct osmo_fsm_state assignment_fsm_states[] = {
.out_state_mask = 0
| S(ASSIGNMENT_ST_WAIT_LCHAN_ACTIVE)
| S(ASSIGNMENT_ST_WAIT_RR_ASS_COMPLETE)
+ | S(ASSIGNMENT_ST_WAIT_LCHAN_ESTABLISHED) /* MODE MODIFY */
,
},
[ASSIGNMENT_ST_WAIT_RR_ASS_COMPLETE] = {
diff --git a/src/osmo-bsc/gsm_04_08_rr.c b/src/osmo-bsc/gsm_04_08_rr.c
index be114f007..848f62391 100644
--- a/src/osmo-bsc/gsm_04_08_rr.c
+++ b/src/osmo-bsc/gsm_04_08_rr.c
@@ -655,7 +655,6 @@ int gsm48_lchan_modify(struct gsm_lchan *lchan, uint8_t mode)
int gsm48_rx_rr_modif_ack(struct msgb *msg)
{
- int rc;
struct gsm48_hdr *gh = msgb_l3(msg);
struct gsm48_chan_mode_modify *mod =
(struct gsm48_chan_mode_modify *) gh->data;
@@ -689,15 +688,7 @@ int gsm48_rx_rr_modif_ack(struct msgb *msg)
break;
}
- /* We've successfully modified the MS side of the channel,
- * now go on to modify the BTS side of the channel */
- rc = rsl_chan_mode_modify_req(msg->lchan);
-
- /* FIXME: we not only need to do this after mode modify, but
- * also after channel activation */
- if (is_ipaccess_bts(msg->lchan->ts->trx->bts) && mod->mode != GSM48_CMODE_SIGN)
- rsl_tx_ipacc_crcx(msg->lchan);
- return rc;
+ return 0;
}
int gsm48_parse_meas_rep(struct gsm_meas_rep *rep, struct msgb *msg)
@@ -970,9 +961,9 @@ static void dispatch_dtap(struct gsm_subscriber_connection *conn,
case GSM48_MT_RR_CHAN_MODE_MODIF_ACK:
rc = gsm48_rx_rr_modif_ack(msg);
if (rc < 0)
- osmo_fsm_inst_dispatch(msg->lchan->fi, LCHAN_EV_CHAN_MODE_MODIF_ERROR, &rc);
+ osmo_fsm_inst_dispatch(msg->lchan->fi, LCHAN_EV_RR_CHAN_MODE_MODIFY_ERROR, &rc);
else
- osmo_fsm_inst_dispatch(msg->lchan->fi, LCHAN_EV_CHAN_MODE_MODIF_ACK, msg);
+ osmo_fsm_inst_dispatch(msg->lchan->fi, LCHAN_EV_RR_CHAN_MODE_MODIFY_ACK, msg);
break;
case GSM48_MT_RR_CLSM_CHG:
handle_classmark_chg(conn, msg);
diff --git a/src/osmo-bsc/lchan_fsm.c b/src/osmo-bsc/lchan_fsm.c
index 26bfd2929..115c3da55 100644
--- a/src/osmo-bsc/lchan_fsm.c
+++ b/src/osmo-bsc/lchan_fsm.c
@@ -59,6 +59,7 @@ bool lchan_may_receive_data(struct gsm_lchan *lchan)
switch (lchan->fi->state) {
case LCHAN_ST_WAIT_RLL_RTP_ESTABLISH:
case LCHAN_ST_ESTABLISHED:
+ case LCHAN_ST_WAIT_RR_CHAN_MODE_MODIFY_ACK:
return true;
default:
return false;
@@ -249,7 +250,7 @@ struct osmo_tdef_state_timeout lchan_fsm_timeouts[32] = {
} while(0)
/* Which state to transition to when lchan_fail() is called in a given state. */
-uint32_t lchan_fsm_on_error[32] = {
+uint32_t lchan_fsm_on_error[34] = {
[LCHAN_ST_UNUSED] = LCHAN_ST_UNUSED,
[LCHAN_ST_WAIT_TS_READY] = LCHAN_ST_UNUSED,
[LCHAN_ST_WAIT_ACTIV_ACK] = LCHAN_ST_BORKEN,
@@ -260,6 +261,8 @@ uint32_t lchan_fsm_on_error[32] = {
[LCHAN_ST_WAIT_RF_RELEASE_ACK] = LCHAN_ST_BORKEN,
[LCHAN_ST_WAIT_AFTER_ERROR] = LCHAN_ST_UNUSED,
[LCHAN_ST_BORKEN] = LCHAN_ST_BORKEN,
+ [LCHAN_ST_WAIT_RR_CHAN_MODE_MODIFY_ACK] = LCHAN_ST_BORKEN,
+ [LCHAN_ST_WAIT_RSL_CHAN_MODE_MODIFY_ACK] = LCHAN_ST_BORKEN,
};
#define lchan_fail(fmt, args...) lchan_fail_to(lchan_fsm_on_error[fi->state], fmt, ## args)
@@ -797,6 +800,10 @@ static void lchan_fsm_wait_rll_rtp_establish_onenter(struct osmo_fsm_inst *fi, u
struct gsm_lchan *lchan = lchan_fi_lchan(fi);
if (lchan->fi_rtp)
osmo_fsm_inst_dispatch(lchan->fi_rtp, LCHAN_RTP_EV_LCHAN_READY, 0);
+ /* Prepare an MGW endpoint CI if appropriate (late). */
+ else if (lchan->activate.info.requires_voice_stream)
+ lchan_rtp_fsm_start(lchan);
+
}
static void lchan_fsm_wait_rll_rtp_establish(struct osmo_fsm_inst *fi, uint32_t event, void *data)
@@ -833,6 +840,66 @@ static void lchan_fsm_wait_rll_rtp_establish(struct osmo_fsm_inst *fi, uint32_t
}
}
+static void lchan_fsm_wait_rr_chan_mode_modify_ack_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state)
+{
+ struct gsm_lchan *lchan = lchan_fi_lchan(fi);
+ gsm48_lchan_modify(lchan, lchan->activate.info.chan_mode);
+}
+
+static void lchan_fsm_wait_rr_chan_mode_modify_ack(struct osmo_fsm_inst *fi, uint32_t event, void *data)
+{
+ switch (event) {
+
+ case LCHAN_EV_RR_CHAN_MODE_MODIFY_ACK:
+ lchan_fsm_state_chg(LCHAN_ST_WAIT_RSL_CHAN_MODE_MODIFY_ACK);
+ return;
+
+ case LCHAN_EV_RR_CHAN_MODE_MODIFY_ERROR:
+ lchan_fail("Failed to change channel mode on the MS side: %s in state %s\n",
+ osmo_fsm_event_name(fi->fsm, event),
+ osmo_fsm_inst_state_name(fi));
+ return;
+
+ default:
+ OSMO_ASSERT(false);
+ }
+}
+
+static void lchan_fsm_wait_rsl_chan_mode_modify_ack_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state)
+{
+ struct gsm_lchan *lchan = lchan_fi_lchan(fi);
+ int rc;
+
+ rc = rsl_chan_mode_modify_req(lchan);
+ if (rc < 0) {
+ lchan_fail("Failed to send rsl message to change the channel mode on the BTS side: state %s\n",
+ osmo_fsm_inst_state_name(fi));
+ }
+}
+
+static void lchan_fsm_wait_rsl_chan_mode_modify_ack(struct osmo_fsm_inst *fi, uint32_t event, void *data)
+{
+ struct gsm_lchan *lchan = lchan_fi_lchan(fi);
+ switch (event) {
+
+ case LCHAN_EV_RSL_CHAN_MODE_MODIFY_ACK:
+ if (lchan->activate.info.requires_voice_stream)
+ lchan_fsm_state_chg(LCHAN_ST_WAIT_RLL_RTP_ESTABLISH);
+ else
+ lchan_fsm_state_chg(LCHAN_ST_ESTABLISHED);
+ return;
+
+ case LCHAN_EV_RSL_CHAN_MODE_MODIFY_NACK:
+ lchan_fail("Failed to change channel mode on the BTS side: %s in state %s\n",
+ osmo_fsm_event_name(fi->fsm, event),
+ osmo_fsm_inst_state_name(fi));
+ return;
+
+ default:
+ OSMO_ASSERT(false);
+ }
+}
+
static void lchan_fsm_established_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state)
{
struct gsm_lchan *lchan = lchan_fi_lchan(fi);
@@ -909,6 +976,8 @@ static void handle_rll_rel_ind_or_conf(struct osmo_fsm_inst *fi, uint32_t event,
static void lchan_fsm_established(struct osmo_fsm_inst *fi, uint32_t event, void *data)
{
struct gsm_lchan *lchan = lchan_fi_lchan(fi);
+ struct lchan_activate_info *info;
+ struct osmo_mgcpc_ep_ci *use_mgwep_ci;
switch (event) {
case LCHAN_EV_RLL_ESTABLISH_IND:
@@ -935,6 +1004,48 @@ static void lchan_fsm_established(struct osmo_fsm_inst *fi, uint32_t event, void
osmo_fsm_inst_state_name(fi));
return;
+ case LCHAN_EV_REQUEST_MODE_MODIFY:
+
+ /* FIXME: Add missing implementation to handle an already existing RTP voice stream on MODE MODIFY.
+ * there may be transitions from VOICE to SIGNALLING and also from VOICE to VOICE with a different
+ * codec. */
+ if (lchan->fi_rtp) {
+ lchan_fail("MODE MODIFY not implemented when RTP voice stream is already active (VOICE => SIGNALLING, VOICE/CODEC_A => VOICE/CODEC_B)\n");
+ return;
+ }
+
+ info = data;
+ lchan->activate.info = *info;
+ use_mgwep_ci = lchan_use_mgw_endpoint_ci_bts(lchan);
+
+ if (info->chan_mode == GSM48_CMODE_SPEECH_AMR) {
+ if (lchan_mr_config(lchan, info->s15_s0) < 0) {
+ lchan_fail("Can not generate multirate configuration IE\n");
+ return;
+ }
+ }
+
+ LOG_LCHAN(lchan, LOGL_INFO,
+ "Modification requested: %s voice=%s MGW-ci=%s type=%s tch-mode=%s encr-alg=A5/%u ck=%s\n",
+ lchan_activate_mode_name(lchan->activate.info.activ_for),
+ lchan->activate.info.requires_voice_stream ? "yes" : "no",
+ lchan->activate.info.requires_voice_stream ?
+ (use_mgwep_ci ? osmo_mgcpc_ep_ci_name(use_mgwep_ci) : "new")
+ : "none",
+ gsm_lchant_name(lchan->type),
+ gsm48_chan_mode_name(lchan->tch_mode),
+ (lchan->activate.info.encr.alg_id ? : 1) - 1,
+ lchan->activate.info.encr.key_len ? osmo_hexdump_nospc(lchan->activate.info.encr.key,
+ lchan->activate.info.encr.key_len) : "none");
+
+ /* While the mode is changed the lchan is virtually "not activated", at least
+ * from the FSM implementations perspective */
+ lchan->activate.concluded = false;
+
+ /* Initiate mode modification, start with the MS side (RR) */
+ lchan_fsm_state_chg(LCHAN_ST_WAIT_RR_CHAN_MODE_MODIFY_ACK);
+ return;
+
default:
OSMO_ASSERT(false);
}
@@ -1090,6 +1201,12 @@ static void lchan_fsm_borken_onenter(struct osmo_fsm_inst *fi, uint32_t prev_sta
case LCHAN_ST_BORKEN:
ctr = BTS_CTR_LCHAN_BORKEN_FROM_BORKEN;
break;
+ case LCHAN_ST_WAIT_RR_CHAN_MODE_MODIFY_ACK:
+ ctr = BTS_CTR_LCHAN_BORKEN_FROM_WAIT_RR_CHAN_MODE_MODIFY_ACK;
+ break;
+ case LCHAN_ST_WAIT_RSL_CHAN_MODE_MODIFY_ACK:
+ ctr = BTS_CTR_LCHAN_BORKEN_FROM_WAIT_RSL_CHAN_MODE_MODIFY_ACK;
+ break;
default:
ctr = BTS_CTR_LCHAN_BORKEN_FROM_UNKNOWN;
}
@@ -1223,6 +1340,32 @@ static const struct osmo_fsm_state lchan_fsm_states[] = {
| S(LCHAN_ST_WAIT_RLL_RTP_RELEASED)
,
},
+ [LCHAN_ST_WAIT_RR_CHAN_MODE_MODIFY_ACK] = {
+ .name = "WAIT_CHAN_RR_MODE_MODIFY_ACK",
+ .onenter = lchan_fsm_wait_rr_chan_mode_modify_ack_onenter,
+ .action = lchan_fsm_wait_rr_chan_mode_modify_ack,
+ .in_event_mask = 0
+ | S(LCHAN_EV_RR_CHAN_MODE_MODIFY_ACK)
+ | S(LCHAN_EV_RR_CHAN_MODE_MODIFY_ERROR)
+ ,
+ .out_state_mask = 0
+ | S(LCHAN_ST_BORKEN)
+ | S(LCHAN_ST_WAIT_RSL_CHAN_MODE_MODIFY_ACK)
+ ,
+ },
+ [LCHAN_ST_WAIT_RSL_CHAN_MODE_MODIFY_ACK] = {
+ .name = "WAIT_RSL_CHAN_MODE_MODIFY_ACK",
+ .onenter = lchan_fsm_wait_rsl_chan_mode_modify_ack_onenter,
+ .action = lchan_fsm_wait_rsl_chan_mode_modify_ack,
+ .in_event_mask = 0
+ | S(LCHAN_EV_RSL_CHAN_MODE_MODIFY_ACK)
+ | S(LCHAN_EV_RSL_CHAN_MODE_MODIFY_NACK)
+ ,
+ .out_state_mask = 0
+ | S(LCHAN_ST_BORKEN)
+ | S(LCHAN_ST_WAIT_RLL_RTP_ESTABLISH)
+ ,
+ },
[LCHAN_ST_ESTABLISHED] = {
.name = "ESTABLISHED",
.onenter = lchan_fsm_established_onenter,
@@ -1233,12 +1376,14 @@ static const struct osmo_fsm_state lchan_fsm_states[] = {
| S(LCHAN_EV_RLL_ESTABLISH_IND) /* ignored */
| S(LCHAN_EV_RTP_ERROR)
| S(LCHAN_EV_RTP_RELEASED)
+ | S(LCHAN_EV_REQUEST_MODE_MODIFY)
,
.out_state_mask = 0
| S(LCHAN_ST_UNUSED)
| S(LCHAN_ST_WAIT_RLL_RTP_RELEASED)
| S(LCHAN_ST_WAIT_BEFORE_RF_RELEASE)
| S(LCHAN_ST_WAIT_RF_RELEASE_ACK)
+ | S(LCHAN_ST_WAIT_RR_CHAN_MODE_MODIFY_ACK)
,
},
[LCHAN_ST_WAIT_RLL_RTP_RELEASED] = {
@@ -1324,8 +1469,10 @@ static const struct value_string lchan_fsm_event_names[] = {
OSMO_VALUE_STRING(LCHAN_EV_RLL_REL_CONF),
OSMO_VALUE_STRING(LCHAN_EV_RSL_RF_CHAN_REL_ACK),
OSMO_VALUE_STRING(LCHAN_EV_RLL_ERR_IND),
- OSMO_VALUE_STRING(LCHAN_EV_CHAN_MODE_MODIF_ACK),
- OSMO_VALUE_STRING(LCHAN_EV_CHAN_MODE_MODIF_ERROR),
+ OSMO_VALUE_STRING(LCHAN_EV_RR_CHAN_MODE_MODIFY_ACK),
+ OSMO_VALUE_STRING(LCHAN_EV_RR_CHAN_MODE_MODIFY_ERROR),
+ OSMO_VALUE_STRING(LCHAN_EV_RSL_CHAN_MODE_MODIFY_ACK),
+ OSMO_VALUE_STRING(LCHAN_EV_RSL_CHAN_MODE_MODIFY_NACK),
{}
};
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-27 14:25:08 +0000