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Harald Welte gerrit-no-reply at lists.osmocom.orgHarald Welte has submitted this change and it was merged. ( https://gerrit.osmocom.org/8054 )
Change subject: a_reset: cleanup + remove dead code
......................................................................
a_reset: cleanup + remove dead code
a_reset.c/h was originally developed to be used in both, bsc and
msc without changes. Unfortunately no suitable library has been
found for a_reset.c/h so the file ended up as duplicated code in
both split brances. Eventually we decided to specialize the
generalized code again, which means some of the functions needed
only by osmo-bsc are removed.
- Remove dead code
- Fix timer identification number (T16)
- use fi->priv to hold context info
- Minor cosmetic fixes
Change-Id: I8e489eb494d358d130e51cb2167929edeaa12e92
Depends: libosmocore I36d221c973d3890721ef1d376fb9be82c4311378
Related: OS#3103
---
M include/osmocom/msc/a_iface.h
M include/osmocom/msc/a_reset.h
M src/libmsc/a_iface.c
M src/libmsc/a_iface_bssap.c
M src/libmsc/a_reset.c
5 files changed, 59 insertions(+), 159 deletions(-)
Approvals:
Harald Welte: Looks good to me, approved
Jenkins Builder: Verified
diff --git a/include/osmocom/msc/a_iface.h b/include/osmocom/msc/a_iface.h
index 3098b51..217011d 100644
--- a/include/osmocom/msc/a_iface.h
+++ b/include/osmocom/msc/a_iface.h
@@ -51,7 +51,7 @@
/* A pointer to the reset handler FSM, the
* state machine is allocated when the BSC
* is registerd. */
- struct a_reset_ctx *reset;
+ struct osmo_fsm_inst *reset_fsm;
/* A pointer to the sccp_user that is associated
* with the A interface. We need this information
diff --git a/include/osmocom/msc/a_reset.h b/include/osmocom/msc/a_reset.h
index cdb17c2..8eb3bbf 100644
--- a/include/osmocom/msc/a_reset.h
+++ b/include/osmocom/msc/a_reset.h
@@ -20,45 +20,12 @@
#pragma once
-
-
-/* Reset context data (callbacks, state machine etc...) */
-struct a_reset_ctx {
-
- /* FSM instance, which handles the reset procedure */
- struct osmo_fsm_inst *fsm;
-
- /* Connection failure counter. When this counter
- * reaches a certain threshold, the reset procedure
- * will be triggered */
- int conn_loss_counter;
-
- /* A human readable name to display in the logs */
- char name[256];
-
- /* Callback function to be called when a connection
- * failure is detected and a rest must occur */
- void (*cb)(void *priv);
-
- /* Privated data for the callback function */
- void *priv;
-};
-
/* Create and start state machine which handles the reset/reset-ack procedure */
-struct a_reset_ctx *a_reset_alloc(const void *ctx, const char *name, void *cb, void *priv,
- bool already_connected);
-
-/* Tear down state machine */
-void a_reset_free(struct a_reset_ctx *reset);
+struct osmo_fsm_inst *a_reset_alloc(void *ctx, const char *name, void *cb,
+ void *priv, bool already_connected);
/* Confirm that we sucessfully received a reset acknowlege message */
-void a_reset_ack_confirm(struct a_reset_ctx *reset);
-
-/* Report a failed connection */
-void a_reset_conn_fail(struct a_reset_ctx *reset);
-
-/* Report a successful connection */
-void a_reset_conn_success(struct a_reset_ctx *reset);
+void a_reset_ack_confirm(struct osmo_fsm_inst *reset_fsm);
/* Check if we have a connection to a specified msc */
-bool a_reset_conn_ready(struct a_reset_ctx *reset);
+bool a_reset_conn_ready(struct osmo_fsm_inst *reset_fsm);
diff --git a/src/libmsc/a_iface.c b/src/libmsc/a_iface.c
index 6f2000e..75fa438 100644
--- a/src/libmsc/a_iface.c
+++ b/src/libmsc/a_iface.c
@@ -209,7 +209,7 @@
/* Deliver paging request to all known BSCs */
llist_for_each_entry(bsc_ctx, &gsm_network->a.bscs, list) {
- if (a_reset_conn_ready(bsc_ctx->reset)) {
+ if (a_reset_conn_ready(bsc_ctx->reset_fsm)) {
LOGP(DBSSAP, LOGL_DEBUG,
"Tx BSSMAP paging message from MSC %s to BSC %s (imsi=%s, tmsi=0x%08x, lac=%u)\n",
osmo_sccp_addr_name(ss7, &bsc_ctx->msc_addr),
@@ -471,10 +471,10 @@
void a_start_reset(struct bsc_context *bsc_ctx, bool already_connected)
{
char bsc_name[32];
- OSMO_ASSERT(bsc_ctx->reset == NULL);
+ OSMO_ASSERT(bsc_ctx->reset_fsm == NULL);
/* Start reset procedure to make the new connection active */
snprintf(bsc_name, sizeof(bsc_name), "bsc-%i", bsc_ctx->bsc_addr.pc);
- bsc_ctx->reset = a_reset_alloc(bsc_ctx, bsc_name, a_reset_cb, bsc_ctx, already_connected);
+ bsc_ctx->reset_fsm = a_reset_alloc(bsc_ctx, bsc_name, a_reset_cb, bsc_ctx, already_connected);
}
/* determine if given msg is BSSMAP RESET related (true) or not (false) */
@@ -521,7 +521,7 @@
a_start_reset(a_conn_info.bsc, false);
} else {
/* This BSC is already known to us, check if we have been through reset yet */
- if (a_reset_conn_ready(a_conn_info.bsc->reset) == false) {
+ if (a_reset_conn_ready(a_conn_info.bsc->reset_fsm) == false) {
LOGP(DBSSAP, LOGL_NOTICE, "Refusing N-CONNECT.ind(%u, %s), BSC not reset yet\n",
scu_prim->u.connect.conn_id, msgb_hexdump_l2(oph->msg));
rc = osmo_sccp_tx_disconn(scu, a_conn_info.conn_id, &a_conn_info.bsc->msc_addr,
@@ -580,7 +580,7 @@
/* As long as we are in the reset phase, only reset related BSSMAP messages may pass
* beond here. */
- if (!bssmap_is_reset(oph->msg) && a_reset_conn_ready(a_conn_info.bsc->reset) == false) {
+ if (!bssmap_is_reset(oph->msg) && a_reset_conn_ready(a_conn_info.bsc->reset_fsm) == false) {
LOGP(DBSSAP, LOGL_NOTICE, "Ignoring N-UNITDATA.ind(%s), BSC not reset yet\n",
msgb_hexdump_l2(oph->msg));
break;
diff --git a/src/libmsc/a_iface_bssap.c b/src/libmsc/a_iface_bssap.c
index 6d5848a..1ace43d 100644
--- a/src/libmsc/a_iface_bssap.c
+++ b/src/libmsc/a_iface_bssap.c
@@ -114,12 +114,12 @@
/* Make sure all orphand subscriber connections will be cleard */
a_clear_all(scu, &a_conn_info->bsc->bsc_addr);
- if (!a_conn_info->bsc->reset)
+ if (!a_conn_info->bsc->reset_fsm)
a_start_reset(a_conn_info->bsc, true);
/* Treat an incoming RESET like an ACK to any RESET request we may have just sent.
* After all, what we wanted is the A interface to be reset, which we now know has happened. */
- a_reset_ack_confirm(a_conn_info->bsc->reset);
+ a_reset_ack_confirm(a_conn_info->bsc->reset_fsm);
}
/* Endpoint to handle BSSMAP reset acknowlegement */
@@ -133,7 +133,7 @@
ss7 = osmo_ss7_instance_find(network->a.cs7_instance);
OSMO_ASSERT(ss7);
- if (a_conn_info->bsc->reset == NULL) {
+ if (a_conn_info->bsc->reset_fsm == NULL) {
LOGP(DBSSAP, LOGL_ERROR, "Received RESET ACK from an unknown BSC %s, ignoring...\n",
osmo_sccp_addr_name(ss7, &a_conn_info->bsc->bsc_addr));
return;
@@ -144,7 +144,7 @@
/* Confirm that we managed to get the reset ack message
* towards the connection reset logic */
- a_reset_ack_confirm(a_conn_info->bsc->reset);
+ a_reset_ack_confirm(a_conn_info->bsc->reset_fsm);
}
/* Handle UNITDATA BSSMAP messages */
diff --git a/src/libmsc/a_reset.c b/src/libmsc/a_reset.c
index 701066f..1e35a10 100644
--- a/src/libmsc/a_reset.c
+++ b/src/libmsc/a_reset.c
@@ -28,188 +28,121 @@
#include <osmocom/msc/debug.h>
#include <osmocom/msc/a_reset.h>
-#define RESET_RESEND_INTERVAL 2 /* sec */
-#define RESET_RESEND_TIMER_NO 1234 /* FIXME: dig out the real timer number */
-#define BAD_CONNECTION_THRESOLD 3 /* connection failures */
+#define RESET_RESEND_INTERVAL 2 /* sec */
+#define RESET_RESEND_TIMER_NO 16 /* See also 3GPP TS 48.008 Chapter 3.1.4.1.3.2 */
-enum fsm_states {
+enum reset_fsm_states {
ST_DISC, /* Disconnected from remote end */
ST_CONN, /* We have a confirmed connection */
};
-enum fsm_evt {
- EV_RESET_ACK, /* got reset acknowlegement from remote end */
- EV_N_DISCONNECT, /* lost a connection */
- EV_N_CONNECT, /* made a successful connection */
+enum reset_fsm_evt {
+ EV_CONN_ACK, /* Received either BSSMAP RESET or BSSMAP RESET
+ * ACK from the remote end */
+};
+
+/* Reset context data (callbacks, state machine etc...) */
+struct reset_ctx {
+ /* Callback function to be called when a connection
+ * failure is detected and a rest must occur */
+ void (*cb)(void *priv);
+
+ /* Privated data for the callback function */
+ void *priv;
};
static const struct value_string fsm_event_names[] = {
- OSMO_VALUE_STRING(EV_RESET_ACK),
- OSMO_VALUE_STRING(EV_N_DISCONNECT),
- OSMO_VALUE_STRING(EV_N_CONNECT),
+ OSMO_VALUE_STRING(EV_CONN_ACK),
{0, NULL}
};
/* Disconnected state */
static void fsm_disc_cb(struct osmo_fsm_inst *fi, uint32_t event, void *data)
{
- struct a_reset_ctx *reset = (struct a_reset_ctx *)data;
- OSMO_ASSERT(reset);
- OSMO_ASSERT(reset->fsm);
- LOGPFSML(reset->fsm, LOGL_NOTICE, "SIGTRAN connection succeded.\n");
-
- reset->conn_loss_counter = 0;
osmo_fsm_inst_state_chg(fi, ST_CONN, 0, 0);
}
-/* Connected state */
-static void fsm_conn_cb(struct osmo_fsm_inst *fi, uint32_t event, void *data)
-{
- struct a_reset_ctx *reset = (struct a_reset_ctx *)data;
- OSMO_ASSERT(reset);
-
- switch (event) {
- case EV_N_DISCONNECT:
- if (reset->conn_loss_counter >= BAD_CONNECTION_THRESOLD) {
- LOGPFSML(reset->fsm, LOGL_NOTICE, "SIGTRAN connection down, reconnecting...\n");
- osmo_fsm_inst_state_chg(fi, ST_DISC, RESET_RESEND_INTERVAL, RESET_RESEND_TIMER_NO);
- } else
- reset->conn_loss_counter++;
- break;
- case EV_N_CONNECT:
- reset->conn_loss_counter = 0;
- break;
- }
-}
-
/* Timer callback to retransmit the reset signal */
static int fsm_reset_ack_timeout_cb(struct osmo_fsm_inst *fi)
{
- struct a_reset_ctx *reset = (struct a_reset_ctx *)fi->priv;
- OSMO_ASSERT(reset->fsm);
-
- LOGPFSML(reset->fsm, LOGL_NOTICE, "(re)sending BSSMAP RESET message...\n");
-
- reset->cb(reset->priv);
-
+ struct reset_ctx *reset_ctx = (struct reset_ctx *)fi->priv;
+ LOGPFSML(fi, LOGL_NOTICE, "(re)sending BSSMAP RESET message...\n");
+ reset_ctx->cb(reset_ctx->priv);
osmo_fsm_inst_state_chg(fi, ST_DISC, RESET_RESEND_INTERVAL, RESET_RESEND_TIMER_NO);
return 0;
}
-static struct osmo_fsm_state fsm_states[] = {
+static struct osmo_fsm_state reset_fsm_states[] = {
[ST_DISC] = {
- .in_event_mask = (1 << EV_RESET_ACK),
- .out_state_mask = (1 << ST_DISC) | (1 << ST_CONN),
+ .in_event_mask = (1 << EV_CONN_ACK),
+ .out_state_mask = (1 << ST_CONN) | (1 << ST_DISC),
.name = "DISC",
.action = fsm_disc_cb,
},
[ST_CONN] = {
- .in_event_mask = (1 << EV_N_DISCONNECT) | (1 << EV_N_CONNECT),
- .out_state_mask = (1 << ST_DISC) | (1 << ST_CONN),
+ .in_event_mask = (1 << EV_CONN_ACK),
.name = "CONN",
- .action = fsm_conn_cb,
},
};
/* State machine definition */
static struct osmo_fsm fsm = {
.name = "A-RESET",
- .states = fsm_states,
- .num_states = ARRAY_SIZE(fsm_states),
+ .states = reset_fsm_states,
+ .num_states = ARRAY_SIZE(reset_fsm_states),
.log_subsys = DMSC,
.timer_cb = fsm_reset_ack_timeout_cb,
.event_names = fsm_event_names,
};
/* Create and start state machine which handles the reset/reset-ack procedure */
-struct a_reset_ctx *a_reset_alloc(const void *ctx, const char *name, void *cb, void *priv,
- bool already_connected)
+struct osmo_fsm_inst *a_reset_alloc(void *ctx, const char *name, void *cb,
+ void *priv, bool already_connected)
{
OSMO_ASSERT(name);
- struct a_reset_ctx *reset;
+ struct reset_ctx *reset_ctx;
+ struct osmo_fsm_inst *reset_fsm;
/* Register the fsm description (if not already done) */
if (osmo_fsm_find_by_name(fsm.name) != &fsm)
osmo_fsm_register(&fsm);
/* Allocate and configure a new fsm instance */
- reset = talloc_zero(ctx, struct a_reset_ctx);
- OSMO_ASSERT(reset);
- reset->priv = priv;
- reset->cb = cb;
- reset->conn_loss_counter = 0;
- reset->fsm = osmo_fsm_inst_alloc(&fsm, NULL, NULL, LOGL_DEBUG, name);
- OSMO_ASSERT(reset->fsm);
- reset->fsm->priv = reset;
+ reset_ctx = talloc_zero(ctx, struct reset_ctx);
+ OSMO_ASSERT(reset_ctx);
+ reset_ctx->priv = priv;
+ reset_ctx->cb = cb;
+ reset_fsm = osmo_fsm_inst_alloc(&fsm, ctx, reset_ctx, LOGL_DEBUG, name);
+ OSMO_ASSERT(reset_fsm);
if (already_connected)
- osmo_fsm_inst_state_chg(reset->fsm, ST_CONN, 0, 0);
+ osmo_fsm_inst_state_chg(reset_fsm, ST_CONN, 0, 0);
else {
/* kick off reset-ack sending mechanism */
- osmo_fsm_inst_state_chg(reset->fsm, ST_DISC, RESET_RESEND_INTERVAL,
+ osmo_fsm_inst_state_chg(reset_fsm, ST_DISC, RESET_RESEND_INTERVAL,
RESET_RESEND_TIMER_NO);
}
- return reset;
-}
-
-/* Tear down state machine */
-void a_reset_free(struct a_reset_ctx *reset)
-{
- OSMO_ASSERT(reset);
- OSMO_ASSERT(reset->fsm);
-
- osmo_fsm_inst_free(reset->fsm);
- reset->fsm = NULL;
-
- memset(reset, 0, sizeof(*reset));
- talloc_free(reset);
+ return reset_fsm;
}
/* Confirm that we sucessfully received a reset acknowlege message */
-void a_reset_ack_confirm(struct a_reset_ctx *reset)
+void a_reset_ack_confirm(struct osmo_fsm_inst *reset_fsm)
{
- OSMO_ASSERT(reset);
- OSMO_ASSERT(reset->fsm);
-
- osmo_fsm_inst_dispatch(reset->fsm, EV_RESET_ACK, reset);
-}
-
-/* Report a failed connection */
-void a_reset_conn_fail(struct a_reset_ctx *reset)
-{
- /* If no reset context is supplied, just drop the info */
- if (!reset)
- return;
-
- OSMO_ASSERT(reset->fsm);
-
- osmo_fsm_inst_dispatch(reset->fsm, EV_N_DISCONNECT, reset);
-}
-
-/* Report a successful connection */
-void a_reset_conn_success(struct a_reset_ctx *reset)
-{
- /* If no reset context is supplied, just drop the info */
- if (!reset)
- return;
-
- OSMO_ASSERT(reset->fsm);
-
- osmo_fsm_inst_dispatch(reset->fsm, EV_N_CONNECT, reset);
+ OSMO_ASSERT(reset_fsm);
+ osmo_fsm_inst_dispatch(reset_fsm, EV_CONN_ACK, NULL);
}
/* Check if we have a connection to a specified msc */
-bool a_reset_conn_ready(struct a_reset_ctx *reset)
+bool a_reset_conn_ready(struct osmo_fsm_inst *reset_fsm)
{
/* If no reset context is supplied, we assume that
* the connection can't be ready! */
- if (!reset)
+ if (!reset_fsm)
return false;
- OSMO_ASSERT(reset->fsm);
- if (reset->fsm->state == ST_CONN)
+ if (reset_fsm->state == ST_CONN)
return true;
return false;
--
To view, visit https://gerrit.osmocom.org/8054
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Gerrit-Project: osmo-msc
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: I8e489eb494d358d130e51cb2167929edeaa12e92
Gerrit-Change-Number: 8054
Gerrit-PatchSet: 4
Gerrit-Owner: dexter <pmaier at sysmocom.de>
Gerrit-Reviewer: Harald Welte <laforge at gnumonks.org>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: Neels Hofmeyr <nhofmeyr at sysmocom.de>
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