Feature #4841
openTC_e1_crcx_and_dlcx_ep does not pass - move the IPA code out of libosmo-abis
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Description
The testcase TC_e1_crcx_and_dlcx_ep can not be executed correctly because it requires a running osmo-e1d but in order to have this available in jenkins this would mean that we need to build the related debian packages with osmo-e1d support, which then creates an impractical dependency to osmo-e1d.
The proper solution is to move the IPA code out of libosmo-abis. Historically that made sense, as the IPA multiplex was first encountered in Abis. But then it was also present in SCCPlite, we started using it for GSUP, and most recently for RSPRO in osmo-remsim. This now means that virtually all osmocom projects depend on libosmo-abis, while all they want is the IPA abstraction. Adding osmo-e1d support to libosmo-abis creates another dependency, and I rally do not want to have to exlpain to an osmo-remsim user why he needs to install an E1 interface driver if he wants to have remote sim functionality. So my plan was to see if we can untangle this somehow without spending two weeks of time on it, and then re-enable the dependency of libosmo-abis to osmo-e1d once nobody (except osmo-mgw and osmo-bsc) depend on libosmo-abis anymore.
See also #2547
Related issues
Updated by laforge almost 2 years ago
- Related to Feature #2011: clean-up / merge IPA (and IPA CCM) code of libosmocore, libosmo-abis, libosmo-netif, openbsc, etc. added
Updated by laforge almost 2 years ago
- Related to Feature #4726: remove build dependency of libosmo-netif to libosmo-abis added
Updated by dexter about 1 year ago
- Status changed from New to In Progress
I have now analyzed the IPA situation a bit. It appears to me that someone has tried to move the IPA code to libosmocore some time ago. There are some basic parts of the IPA code that are already in libosmocore. Presumably the bare minimum that was required to implement the control interface. The major part is still in libosmo-abis.
Here is an overview of of some locations where to find IPA code:
occurrences in libosmocore: http://git.osmocom.org/libosmocore/tree/include/osmocom/gsm/protocol/ipaccess.h http://git.osmocom.org/libosmocore/tree/include/osmocom/gsm/ipa.h http://git.osmocom.org/libosmocore/tree/src/gsm/ipa.c occurrences in libosmo-abis: http://git.osmocom.org/libosmo-abis/tree/include/osmocom/abis/ipaccess.h http://git.osmocom.org/libosmo-abis/tree/src/input/ipaccess.c http://git.osmocom.org/libosmo-abis/tree/include/osmocom/abis/ipa.h http://git.osmocom.org/libosmo-abis/tree/src/input/ipa.c http://git.osmocom.org/libosmo-abis/tree/src/input/ipa_keepalive.c http://git.osmocom.org/libosmo-abis/tree/include/osmocom/abis/ipa_proxy.h http://git.osmocom.org/libosmo-abis/tree/src/ipa_proxy.c
Here is an overview of the functions that are used by code that that depends on IPA:
osmo-hlr:gsup_server.c: osmo-hlr osmo_ipa_name_to_str osmo-hlr osmo_ipa_name_set libosmocore ipa_prepend_header_ext libosmocore ipa_ccm_idtag_name libosmo-abis ipa_server_conn_send libosmo-abis ipa_server_conn_ccm libosmo-abis ipa_server_conn_create libosmo-abis ipa_server_conn_destroy libosmo-abis ipa_server_link_create libosmo-abis ipa_server_link_open libosmo-abis ipa_server_link_close libosmo-abis ipa_server_link_destroy libosmo-abis ipa_msg_push_header osmo-hlr:gsup_client.c: libosmo-abis ipa_client_conn_send libosmo-abis ipa_client_conn_open libosmo-abis ipaccess_bts_handle_ccm libosmo-abis ipa_client_conn_close libosmo-abis ipa_client_conn_destroy libosmo-abis ipa_client_conn_clear_queue libosmo-abis ipa_msg_push_header libosmocore:control_if.c: libosmocore ipa_prepend_header_ext libosmocore ipa_prepend_header_ext libosmocore ipa_ccm_send_pong libosmocore ipa_ccm_send_id_ack libosmoabis:ipa_proxy.c: libosmo-abis ipa_server_conn_send libosmo-abis ipa_server_conn_create libosmo-abis ipa_server_conn_create2 libosmo-abis ipa_client_conn_open osmo-remsim:rspro_server.c: libosmocore ipa_prepend_header_ext libosmo-abis ipa_msg_push_header libosmo-abis ipa_server_conn_send libosmo-abis ipa_server_conn_ccm libosmo-abis ipa_keepalive_fsm_pong_received libosmo-abis ipa_server_conn_create libosmo-abis ipa_server_conn_alloc_keepalive_fsm libosmo-abis ipa_keepalive_fsm_start libosmo-abis ipa_server_conn_destroy libosmo-abis ipa_server_link_create libosmo-abis ipa_server_link_open osmo-remsim:bankd_main.c: libosmocore ipa_prepend_header_ext libosmocore ipa_prepend_header libosmocore ipa_ccm_send_pong libosmocore ipa_ccm_send_id_ack
Separating the IPA code from libosmo-abis would mean that the applications that use the code will most likely have to be touched so that they include new header files. To keep old code compatible it might be necessary to keep a wrapper in libosmo-abis that still provides all the ipa_xxx functions.
To my knowledge the following applications currently depend on IPA in libosmo-abis
osmo-bsc
osmo-mgw
osmo-bts
osmo-remsim
osmo-hlr
libosmo-sccp (can't see libosmo-abis in configure.ac?)
Updated by dexter 12 months ago
laforge also did a study about the location and usage of IPA related functions:
libosmocore * ipa_ccm_idtag_name() * ipa_ccm_idtag_parse() ** libosmo-abis ** libosmo-sccp ** osmo-bsc * ipa_ccm_idtag_parse_off() * ipa_parse_unitid() * ipa_ccm_tlv_to_unitdata() * ipa_ccm_make_id_resp() * ipa_ccm_make_id_resp_from_req() ** libosmo-sccp * ipa_send() ** libosmoabis * ipa_ccm_send_pong() ** osmo-bsc/ipaccess-proxy * ipa_ccm_send_id_ack() ** osmo-bsc/ipaccess-proxy * ipa_ccm_send_id_req() ** osmo-bsc/ipaccess-proxy ** libosmo-abis ** libosmo-sccp * ipa_ccm_rcvmsg_base() ** libosmo-abis * ipa_ccm_rcvmsg_bts_base() ** libosmo-abis ** osmo-bts/sysmbts_mgr_calib * ipa_prepend_header_ext() ** osmo-bsc, osmo-bts, osmo-hlr, osmo-msc, osmo-sgsn, osmo-sysmon, ... * ipa_prepend_header() ** osmo-bsc, osmo-bts, osmo-hlr, osmo-msc, osmo-sgsn, osmo-sysmon, ... * ipa_msg_recv() ** UNUSED * ipa_msg_recv_buffered() ** libosmo-abis, libosmo-sccp * ipa_msg_alloc() ** libosmo-abis, libosmo-sccp libosmo-abis * ipa_msg_push_header ** libosmo-netif, libosmo-sccp, osmo-msc, osmo-sgan * ipa_client_conn_close ** osmo-msc, osmo-sgsn * ipa_client_conn_create ** osmo-bts, osmo-msc, osmo-sgsn * ipa_client_conn_destroy ** osmo-msc, osmo-sgsn * ipa_client_conn_open ** osmo-bts, osmo-msc, osmo-sgsn * ipa_client_conn_send ** osmo-bts, osmo-msc, osmo-sgsn, osmo-remsim * ipa_client_conn_clear_queue ** osmo-msc, osmo-sgsn * ipa_server_link_create ** osmo-hlr * ipa_server_link_close ** osmo-hlr * ipa_server_conn_create ** osmo-hlr * ipa_server_conn_ccm ** osmo-hlr * ipa_server_conn_destroy ** osmo-hlr * ipa_server_conn_send ** osmo-hlr * ipa_keepalive_fsm_start libosmo-netif * chan_abis_ipa_srv / chan_abis_ipa_clnt ** cannot deal with fragmented IPA messages! ** nowhere used, let's remove * ipaccess_idtag_name() * osmo_ipa_msg_alloc() ** only inside library * osmo_ipa_msg_push_header() ** libosmo-sccp * osmo_ipa_process_msg() ** libosmo-sccp * osmo_ipa_idtag_parse() ** only inside library * osmo_ipa_parse_unitid() ** only inside library * ipaccess_send_pong() ** identical to ipa_ccm_send_pong/libosmogsm ** libosmo-sccp * ipaccess_send_id_ack() ** identical to ipa_ccm_send_ack/libosmogsm ** libosmo-sccp * ipaccess_send_id_req() ** identical to ipa_ccm_send_req/libosmogsm ** only inside library * osmo_ipa_rcvmsg_base() ** only inside library * ipaccess_parse_unitid() ** identical to ipa_parse_unitid/libosmogsm? ** only inside library * ipa_cli_id_resp() ** only inside library * ipa_cli_id_ack() ** only inside library * osmo_ipa_parse_msg_id_resp() ** only inside library
I think one of the main difficulties here is that this is not only about moving the IPA code out of libosmo-abis. There is also a larger refactoring required. Its also not only one IPA implementations but several different ones.
