Support Neighbor Address Resolution over PCUIF IPA multiplex
While NACC was initially developed, it became clear there was need for
a way to interact PCU<->BSC in order resolve ARFCN+BSIC into CGI-PS
for later RIM usage.
Hence, this resolution was first (until today) implemented using an out
of bands RPC system using the CTRL interface, which required specific
config to be written and matches in osmo-pcu and osmo-bsc VTY (ip+port
of the CTRL interface to use).
However, this has several shortcomings:
* As explained above, specific configuration is required
* Since recently, we do support BSC redundancy in osmo-bts. Hence the BTS
may switch to a BSC other than first one. If that happened, that'd mean
the CTRL interface would still point to the initially configured one,
which may not be the same currently serving the PCU.
During recent development of ANR related features, a similar need for
PCU<->BSC was required, but this time it was decided to extend the IPA
multiplex of the Abis OML connection to pass PCUIF messages,
transparently forwarded to each side by the BTS.
This has the advantage that connection PCU<->BTS is handled by BTS and
both sides send messages transparently.
Let's switch by default to using this new interface, while still
maintaing the old way for a while (announcing them as deprecated) to
avoid breaking existing deployments until they are upgraded to new
versions of osmo-pcu and osmo-bsc.
Related: SYS#4971
Change-Id: I6ad33c7ab10202840cf804dea9ba595978d0e920
diff --git a/src/nacc_fsm.h b/src/nacc_fsm.h
index 7b0adfd..04c9ba4 100644
--- a/src/nacc_fsm.h
+++ b/src/nacc_fsm.h
@@ -29,7 +29,7 @@
enum nacc_fsm_event {
NACC_EV_RX_CELL_CHG_NOTIFICATION, /* data: Packet_Cell_Change_Notification_t* */
- NACC_EV_RX_RAC_CI, /* no data passed, RAC_CI became available in neigh_cache */
+ NACC_EV_RX_RAC_CI, /* RAC_CI became available in neigh_cache. NULL on failure, pointer to ctx->cgi_ps on success */
NACC_EV_RX_SI, /* data: struct si_cache_entry* */
NACC_EV_CREATE_RLCMAC_MSG, /* data: struct nacc_ev_create_rlcmac_msg_ctx* */
NACC_EV_RX_CELL_CHG_CONTINUE_ACK,
@@ -69,3 +69,6 @@
};
struct nacc_fsm_ctx *nacc_fsm_alloc(struct GprsMs* ms);
+
+bool nacc_fsm_is_waiting_addr_resolution(const struct nacc_fsm_ctx *ctx,
+ const struct neigh_cache_entry_key *neigh_key);