neels has uploaded this change for review. ( https://gerrit.osmocom.org/c/osmo-bsc/+/32151 )
Change subject: SCCP N-PCSTATE: trigger MSC status on PC availability ...................................................................... SCCP N-PCSTATE: trigger MSC status on PC availability Related: SYS#6319 Change-Id: I3a0869598b8395601a16d78dbc46eec400c0ea84 --- M include/osmocom/bsc/bssmap_reset.h M src/osmo-bsc/bssmap_reset.c M src/osmo-bsc/osmo_bsc_sigtran.c 3 files changed, 102 insertions(+), 1 deletion(-) git pull ssh://gerrit.osmocom.org:29418/osmo-bsc refs/changes/51/32151/1 diff --git a/include/osmocom/bsc/bssmap_reset.h b/include/osmocom/bsc/bssmap_reset.h index fcd850b..c0de13c 100644 --- a/include/osmocom/bsc/bssmap_reset.h +++ b/include/osmocom/bsc/bssmap_reset.h @@ -28,4 +28,5 @@ struct bssmap_reset *bssmap_reset_alloc(void *ctx, const char *label, const struct bssmap_reset_cfg *cfg); bool bssmap_reset_is_conn_ready(const struct bssmap_reset *bssmap_reset); void bssmap_reset_resend_reset(struct bssmap_reset *bssmap_reset); +void bssmap_reset_set_disconnected(struct bssmap_reset *bssmap_reset); void bssmap_reset_term_and_free(struct bssmap_reset *bssmap_reset); diff --git a/src/osmo-bsc/bssmap_reset.c b/src/osmo-bsc/bssmap_reset.c index fa6684d..ac304a5 100644 --- a/src/osmo-bsc/bssmap_reset.c +++ b/src/osmo-bsc/bssmap_reset.c @@ -251,6 +251,12 @@ osmo_fsm_inst_state_chg_ms(bssmap_reset->fi, BSSMAP_RESET_ST_DISC, 1, 0); } +void bssmap_reset_set_disconnected(struct bssmap_reset *bssmap_reset) +{ + /* Go to disconnected state, with the normal RESET timeout to re-send RESET. */ + bssmap_reset_fsm_state_chg(bssmap_reset->fi, BSSMAP_RESET_ST_DISC); +} + static __attribute__((constructor)) void bssmap_reset_fsm_init(void) { OSMO_ASSERT(osmo_fsm_register(&bssmap_reset_fsm) == 0); diff --git a/src/osmo-bsc/osmo_bsc_sigtran.c b/src/osmo-bsc/osmo_bsc_sigtran.c index 8837330..70dcdc5 100644 --- a/src/osmo-bsc/osmo_bsc_sigtran.c +++ b/src/osmo-bsc/osmo_bsc_sigtran.c @@ -36,6 +36,7 @@ #include <osmocom/bsc/gsm_data.h> #include <osmocom/bsc/bts.h> #include <osmocom/bsc/paging.h> +#include <osmocom/bsc/bssmap_reset.h> #include <osmocom/mgcp_client/mgcp_common.h> /* A pointer to a list with all involved MSCs @@ -92,7 +93,7 @@ &msc->a.msc_addr, msg); } -/* Find an MSC by its sigtran point code */ +/* Find an MSC by its remote SCCP address */ static struct bsc_msc_data *get_msc_by_addr(const struct osmo_sccp_addr *msc_addr) { struct osmo_ss7_instance *ss7; @@ -107,6 +108,19 @@ return NULL; } +/* Find an MSC by its sigtran point code */ +static struct bsc_msc_data *get_msc_by_pc(uint32_t pc) +{ + struct bsc_msc_data *msc; + llist_for_each_entry(msc, msc_list, entry) { + if ((msc->a.msc_addr.presence & OSMO_SCCP_ADDR_T_PC) == 0) + continue; + if (msc->a.msc_addr.pc == pc) + return msc; + } + return NULL; +} + /* Received data from MSC, use the connection id which MSC it is */ static int handle_data_from_msc(struct gsm_subscriber_connection *conn, struct msgb *msg) { @@ -188,6 +202,72 @@ return rc; } +static void handle_pcstate_ind(const struct osmo_scu_pcstate_param *pcst) +{ + struct bsc_msc_data *msc; + bool connected; + bool disconnected; + + LOGP(DMSC, LOGL_DEBUG, "N-PCSTATE ind: affected_pc=%u sp_status=%d remote_sccp_status=%d\n", + pcst->affected_pc, pcst->sp_status, pcst->remote_sccp_status); + + /* If we don't care about that point-code, ignore PCSTATE. */ + msc = get_msc_by_pc(pcst->affected_pc); + if (!msc) + return; + + /* See if this marks the point code to have become available, or to have been lost. There are two parts, the + * Service Point Status, and the Remote SCCP Status; also this PCSTATE may indicate things not related to + * connecting or disconnecting. Figure it out with separate flags for connect and disconnect: */ + connected = false; + disconnected = false; + + switch (pcst->sp_status) { + case OSMO_SCCP_SP_S_ACCESSIBLE: + connected = true; + break; + case OSMO_SCCP_SP_S_INACCESSIBLE: + disconnected = true; + break; + default: + case OSMO_SCCP_SP_S_CONGESTED: + /* Neither connecting nor disconnecting */ + break; + } + + switch (pcst->remote_sccp_status) { + case OSMO_SCCP_REM_SCCP_S_AVAILABLE: + if (!disconnected) + connected = true; + break; + case OSMO_SCCP_REM_SCCP_S_UNAVAILABLE_UNKNOWN: + case OSMO_SCCP_REM_SCCP_S_UNEQUIPPED: + case OSMO_SCCP_REM_SCCP_S_INACCESSIBLE: + disconnected = true; + connected = false; + break; + default: + case OSMO_SCCP_REM_SCCP_S_CONGESTED: + /* Neither connecting nor disconnecting */ + break; + } + + if (disconnected && a_reset_conn_ready(msc)) { + LOGP(DMSC, LOGL_NOTICE, + "(msc%d) now unreachable: N-PCSTATE ind: pc=%u sp_status=%d remote_sccp_status=%d\n", + msc->nr, pcst->affected_pc, pcst->sp_status, pcst->remote_sccp_status); + /* A previously usable MSC has disconnected. Kick the BSSMAP back to DISC state. */ + bssmap_reset_set_disconnected(msc->a.bssmap_reset); + } else if (connected && !a_reset_conn_ready(msc)) { + LOGP(DMSC, LOGL_NOTICE, + "(msc%d) now available: N-PCSTATE ind: pc=%u sp_status=%d remote_sccp_status=%d\n", + msc->nr, pcst->affected_pc, pcst->sp_status, pcst->remote_sccp_status); + /* A previously unusable MSC has become reachable. Trigger immediate BSSMAP RESET -- we would resend a + * RESET either way, but we might as well do it now to speed up connecting. */ + bssmap_reset_resend_reset(msc->a.bssmap_reset); + } +} + /* Callback function, called by the SCCP stack when data arrives */ static int sccp_sap_up(struct osmo_prim_hdr *oph, void *_scu) { @@ -255,6 +335,10 @@ } break; + case OSMO_PRIM(OSMO_SCU_PRIM_N_PCSTATE, PRIM_OP_INDICATION): + handle_pcstate_ind(&scu_prim->u.pcstate); + break; + default: LOGP(DMSC, LOGL_ERROR, "Unhandled SIGTRAN operation %s on primitive %u\n", get_value_string(osmo_prim_op_names, oph->operation), oph->primitive); -- To view, visit https://gerrit.osmocom.org/c/osmo-bsc/+/32151 To unsubscribe, or for help writing mail filters, visit https://gerrit.osmocom.org/settings Gerrit-Project: osmo-bsc Gerrit-Branch: master Gerrit-Change-Id: I3a0869598b8395601a16d78dbc46eec400c0ea84 Gerrit-Change-Number: 32151 Gerrit-PatchSet: 1 Gerrit-Owner: neels <nhofm...@sysmocom.de> Gerrit-MessageType: newchange