From 0aed654ac735749be31e4119336808596136aac3 Mon Sep 17 00:00:00 2001 From: Andreas Eversberg Date: Sat, 23 Jun 2012 10:33:16 +0200 Subject: [PATCH] Split of L1 interface to be used with OpenBTS or sysmo-BTS The OpenBTS socket functions are moved from main to pcu_l1_if.cpp. New sysmo_l1_if.cpp is introduced. It used special unix socket interface to connect to sysmo-BTS. This is required to access CCCH/RACH and info about cell layout. Traffic is also forwarded via this interface, but it direct access of L1 baseband DSP will be added soon. In order to handle ready-to-send requests above l1_if, the transmit queue (for downlink blocks) is moved to gprs_rlcmac.cpp. The TBF instance additionally holds TRX and TS info, but this is only a hack currently. TBF instance requires more details about allocated ressources in the future. --- src/Makefile.am | 9 +- src/gprs_bssgp_pcu.cpp | 3 +- src/gprs_rlcmac.cpp | 108 ++++++-- src/gprs_rlcmac.h | 15 +- src/pcu_l1_if.cpp | 204 ++++++++++++--- src/pcu_l1_if.h | 59 ++--- src/pcu_main.cpp | 94 ------- src/sysmo_l1_if.cpp | 562 +++++++++++++++++++++++++++++++++++++++++ 8 files changed, 865 insertions(+), 189 deletions(-) create mode 100644 src/sysmo_l1_if.cpp diff --git a/src/Makefile.am b/src/Makefile.am index 1728c9e8..db1f87f9 100644 --- a/src/Makefile.am +++ b/src/Makefile.am @@ -33,10 +33,17 @@ libgprs_la_SOURCES = \ gsm_rlcmac.cpp \ gprs_bssgp_pcu.cpp \ gprs_rlcmac.cpp \ - pcu_l1_if.cpp \ gsm_timer.cpp \ bitvector.cpp +if ENABLE_SYSMOBTS +libgprs_la_SOURCES += \ + sysmo_l1_if.cpp +else +libgprs_la_SOURCES += \ + pcu_l1_if.cpp +endif + noinst_PROGRAMS = \ RLCMACTest \ pcu diff --git a/src/gprs_bssgp_pcu.cpp b/src/gprs_bssgp_pcu.cpp index 82e483c3..f40d2a6f 100644 --- a/src/gprs_bssgp_pcu.cpp +++ b/src/gprs_bssgp_pcu.cpp @@ -38,7 +38,8 @@ int gprs_bssgp_pcu_rx_dl_ud(struct msgb *msg, struct tlv_parsed *tp) if (tfi < 0) { return tfi; } - tbf = tbf_alloc(tfi); + /* FIXME: select right TRX/TS */ + tbf = tbf_alloc(tfi, 0, 0); tbf->direction = GPRS_RLCMAC_DL_TBF; tbf->state = GPRS_RLCMAC_WAIT_DATA_SEQ_START; tbf->tlli = ntohl(budh->tlli); diff --git a/src/gprs_rlcmac.cpp b/src/gprs_rlcmac.cpp index 7e9a0321..c50e7aec 100644 --- a/src/gprs_rlcmac.cpp +++ b/src/gprs_rlcmac.cpp @@ -24,6 +24,7 @@ LLIST_HEAD(gprs_rlcmac_tbfs); void *rlcmac_tall_ctx; +LLIST_HEAD(block_queue); int tfi_alloc() { @@ -47,7 +48,7 @@ int tfi_alloc() } /* lookup TBF Entity (by TFI) */ -static struct gprs_rlcmac_tbf *tbf_by_tfi(uint8_t tfi) +struct gprs_rlcmac_tbf *tbf_by_tfi(uint8_t tfi) { struct gprs_rlcmac_tbf *tbf; @@ -58,7 +59,7 @@ static struct gprs_rlcmac_tbf *tbf_by_tfi(uint8_t tfi) return NULL; } -static struct gprs_rlcmac_tbf *tbf_by_tlli(uint32_t tlli) +struct gprs_rlcmac_tbf *tbf_by_tlli(uint32_t tlli) { struct gprs_rlcmac_tbf *tbf; llist_for_each_entry(tbf, &gprs_rlcmac_tbfs, list) { @@ -68,7 +69,7 @@ static struct gprs_rlcmac_tbf *tbf_by_tlli(uint32_t tlli) return NULL; } -struct gprs_rlcmac_tbf *tbf_alloc(uint8_t tfi) +struct gprs_rlcmac_tbf *tbf_alloc(uint8_t tfi, uint8_t trx, uint8_t ts) { struct gprs_rlcmac_tbf *tbf; @@ -77,12 +78,16 @@ struct gprs_rlcmac_tbf *tbf_alloc(uint8_t tfi) return NULL; tbf->tfi = tfi; + tbf->trx = trx; + tbf->ts = ts; + tbf->arfcn = pcu_l1if_bts.trx[trx].arfcn; + tbf->tsc = pcu_l1if_bts.trx[trx].ts[ts].tsc; llist_add(&tbf->list, &gprs_rlcmac_tbfs); return tbf; } -static void tbf_free(struct gprs_rlcmac_tbf *tbf) +void tbf_free(struct gprs_rlcmac_tbf *tbf) { llist_del(&tbf->list); talloc_free(tbf); @@ -154,6 +159,13 @@ static void tbf_gsm_timer_start(struct gprs_rlcmac_tbf *tbf, unsigned int fT, osmo_gsm_timer_schedule(&tbf->gsm_timer, frames); } +static void gprs_rlcmac_enqueue_block(bitvec *block, int len) +{ + struct msgb *msg = msgb_alloc(len, "rlcmac_dl"); + bitvec_pack(block, msgb_put(msg, len)); + msgb_enqueue(&block_queue, msg); +} + void write_packet_downlink_assignment(bitvec * dest, uint8_t tfi, uint32_t tlli, uint8_t tn, uint8_t ta, uint8_t tsc) { // TODO We should use our implementation of encode RLC/MAC Control messages. @@ -259,7 +271,7 @@ void write_packet_uplink_assignment(bitvec * dest, uint8_t tfi, uint32_t tlli) // GSM 04.08 9.1.18 Immediate assignment int write_immediate_assignment(bitvec * dest, uint8_t downlink, uint8_t ra, uint32_t fn, - uint8_t ta, uint8_t tfi = 0, uint32_t tlli = 0) + uint8_t ta, uint16_t arfcn, uint8_t ts, uint8_t tsc, uint8_t tfi = 0, uint32_t tlli = 0) { unsigned wp = 0; @@ -277,10 +289,10 @@ int write_immediate_assignment(bitvec * dest, uint8_t downlink, uint8_t ra, uint // GSM 04.08 10.5.2.25a Packet Channel Description bitvec_write_field(dest, wp,0x1,5); // Channel type - bitvec_write_field(dest, wp,(l1fh->fl1h)->channel_info.tn,3); // TN - bitvec_write_field(dest, wp,(l1fh->fl1h)->channel_info.tsc,3); // TSC + bitvec_write_field(dest, wp,ts,3); // TN + bitvec_write_field(dest, wp,tsc,3); // TSC bitvec_write_field(dest, wp,0x0,3); // non-hopping RF channel configuraion - bitvec_write_field(dest, wp,(l1fh->fl1h)->channel_info.arfcn,10); // ARFCN + bitvec_write_field(dest, wp,arfcn,10); // ARFCN //10.5.2.30 Request Reference bitvec_write_field(dest, wp,ra,8); // RA @@ -418,7 +430,7 @@ void gprs_rlcmac_tx_ul_ack(uint8_t tfi, uint32_t tlli, RlcMacUplinkDataBlock_t * LOGPC(DRLCMAC, LOGL_NOTICE, "\n"); LOGP(DRLCMAC, LOGL_NOTICE, "------------------------- TX : Packet Uplink Ack -------------------------\n"); free(packet_uplink_ack); - pcu_l1if_tx(packet_uplink_ack_vec, GsmL1_Sapi_Pacch); + gprs_rlcmac_enqueue_block(packet_uplink_ack_vec, 23); bitvec_free(packet_uplink_ack_vec); } @@ -589,7 +601,7 @@ int gprs_rlcmac_rcv_control_block(bitvec *rlc_block) uint8_t tfi = 0; uint32_t tlli = 0; struct gprs_rlcmac_tbf *tbf; - struct gprs_rlcmac_tbf *ul_tbf; +// struct gprs_rlcmac_tbf *ul_tbf; RlcMacUplink_t * ul_control_block = (RlcMacUplink_t *)malloc(sizeof(RlcMacUplink_t)); LOGP(DRLCMAC, LOGL_NOTICE, "+++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++\n"); @@ -642,26 +654,79 @@ void gprs_rlcmac_rcv_block(bitvec *rlc_block) } } -int gprs_rlcmac_rcv_rach(uint8_t ra, uint32_t Fn, uint16_t ta) +struct msgb *gen_dummy_msg(void) +{ + struct msgb *msg = msgb_alloc(23, "rlcmac_dl_idle"); + // RLC/MAC filler with USF=1 + bitvec *filler = bitvec_alloc(23); + bitvec_unhex(filler, "41942b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); + bitvec_pack(filler, msgb_put(msg, 23)); + bitvec_free(filler); + return msg; +} + +void gprs_rlcmac_rcv_rts_block(uint8_t trx, uint8_t ts, uint16_t arfcn, + uint32_t fn, uint8_t block_nr) +{ + struct msgb *msg; + + set_current_fn(fn); + msg = msgb_dequeue(&block_queue); + if (!msg) + msg = gen_dummy_msg(); + pcu_l1if_tx_pdtch(msg, trx, ts, arfcn, fn, block_nr); +} + +int select_pdch(uint8_t *_trx, uint8_t *_ts) +{ + uint8_t trx, ts; + + for (trx = 0; trx < 8; trx++) { + for (ts = 0; ts < 8; ts++) { + if (pcu_l1if_bts.trx[trx].ts[ts].enable) { + *_trx = trx; + *_ts = ts; + return 0; + } + } + } + + return -EBUSY; +} + +int gprs_rlcmac_rcv_rach(uint8_t ra, uint32_t Fn, int16_t qta) { struct gprs_rlcmac_tbf *tbf; + uint8_t trx, ts; + if (select_pdch(&trx, &ts)) { + LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n"); + /* FIXME: send reject */ + return -EBUSY; + } // Create new TBF int tfi = tfi_alloc(); if (tfi < 0) { return tfi; } - tbf = tbf_alloc(tfi); + tbf = tbf_alloc(tfi, trx, ts); + if (qta < 0) + qta = 0; + if (qta > 252) + qta = 252; + tbf->ta = qta >> 2; tbf->direction = GPRS_RLCMAC_UL_TBF; tbf->state = GPRS_RLCMAC_WAIT_DATA_SEQ_START; LOGP(DRLCMAC, LOGL_NOTICE, "TBF: [UPLINK] START TFI: %u\n", tbf->tfi); - LOGP(DRLCMAC, LOGL_NOTICE, "RX: [PCU <- BTS] TFI: %u RACH\n", tbf->tfi); + LOGP(DRLCMAC, LOGL_NOTICE, "RX: [PCU <- BTS] TFI: %u RACH qbit-ta=%d ra=%d, Fn=%d (%d,%d,%d)\n", tbf->tfi, qta, ra, Fn, (Fn / (26 * 51)) % 32, Fn % 51, Fn % 26); LOGP(DRLCMAC, LOGL_NOTICE, "TX: [PCU -> BTS] TFI: %u Packet Immidiate Assignment\n", tbf->tfi); bitvec *immediate_assignment = bitvec_alloc(23); bitvec_unhex(immediate_assignment, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); - int len = write_immediate_assignment(immediate_assignment, 0, ra, Fn, ta, tbf->tfi); - pcu_l1if_tx(immediate_assignment, GsmL1_Sapi_Agch, len); + int len = write_immediate_assignment(immediate_assignment, 0, ra, Fn, tbf->ta, tbf->arfcn, tbf->ts, tbf->tsc, tbf->tfi); + pcu_l1if_tx_agch(immediate_assignment, len); bitvec_free(immediate_assignment); + + return 0; } // Send RLC data to OpenBTS. @@ -721,7 +786,7 @@ void gprs_rlcmac_tx_dl_data_block(uint32_t tlli, uint8_t tfi, uint8_t *pdu, int encode_gsm_rlcmac_downlink_data(data_block_vector, data_block); LOGP(DRLCMAC, LOGL_NOTICE, "------------------------- TX : Downlink Data Block -------------------------\n"); free(data_block); - pcu_l1if_tx(data_block_vector, GsmL1_Sapi_Pdtch); + gprs_rlcmac_enqueue_block(data_block_vector, BLOCK_LEN); bitvec_free(data_block_vector); // Singular case, TS 44.060 10.4.14 @@ -780,6 +845,8 @@ int gprs_rlcmac_segment_llc_pdu(struct gprs_rlcmac_tbf *tbf) start_index += block_data_len; } } + + return 0; } /* Send Uplink unit-data to SGSN. */ @@ -812,8 +879,8 @@ void gprs_rlcmac_downlink_assignment(gprs_rlcmac_tbf *tbf) LOGP(DRLCMAC, LOGL_NOTICE, "TX: [PCU -> BTS] TFI: %u TLLI: 0x%08x Immidiate Assignment (CCCH)\n", tbf->tfi, tbf->tlli); bitvec *immediate_assignment = bitvec_alloc(23); bitvec_unhex(immediate_assignment, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); - int len = write_immediate_assignment(immediate_assignment, 1, 125, get_current_fn(), (l1fh->fl1h)->channel_info.ta, tbf->tfi, tbf->tlli); - pcu_l1if_tx(immediate_assignment, GsmL1_Sapi_Agch, len); + int len = write_immediate_assignment(immediate_assignment, 1, 125, get_current_fn(), tbf->ta, tbf->arfcn, tbf->ts, tbf->tsc, tbf->tfi, tbf->tlli); + pcu_l1if_tx_agch(immediate_assignment, len); bitvec_free(immediate_assignment); tbf_gsm_timer_start(tbf, 0, 120); } @@ -823,15 +890,14 @@ void gprs_rlcmac_packet_downlink_assignment(gprs_rlcmac_tbf *tbf) LOGP(DRLCMAC, LOGL_NOTICE, "TX: [PCU -> BTS] TFI: %u TLLI: 0x%08x Packet DL Assignment\n", tbf->tfi, tbf->tlli); bitvec *packet_downlink_assignment_vec = bitvec_alloc(23); bitvec_unhex(packet_downlink_assignment_vec, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); - write_packet_downlink_assignment(packet_downlink_assignment_vec, tbf->tfi, tbf->tlli, (l1fh->fl1h)->channel_info.tn, - (l1fh->fl1h)->channel_info.ta, (l1fh->fl1h)->channel_info.tsc); + write_packet_downlink_assignment(packet_downlink_assignment_vec, tbf->tfi, tbf->tlli, tbf->ts, tbf->ta, tbf->tsc); RlcMacDownlink_t * packet_downlink_assignment = (RlcMacDownlink_t *)malloc(sizeof(RlcMacDownlink_t)); LOGP(DRLCMAC, LOGL_NOTICE, "+++++++++++++++++++++++++ TX : Packet Downlink Assignment +++++++++++++++++++++++++\n"); decode_gsm_rlcmac_downlink(packet_downlink_assignment_vec, packet_downlink_assignment); LOGPC(DRLCMAC, LOGL_NOTICE, "\n"); LOGP(DRLCMAC, LOGL_NOTICE, "------------------------- TX : Packet Downlink Assignment -------------------------\n"); free(packet_downlink_assignment); - pcu_l1if_tx(packet_downlink_assignment_vec, GsmL1_Sapi_Pacch); + gprs_rlcmac_enqueue_block(packet_downlink_assignment_vec, 23); bitvec_free(packet_downlink_assignment_vec); tbf_gsm_timer_start(tbf, 0, 120); } diff --git a/src/gprs_rlcmac.h b/src/gprs_rlcmac.h index eb651c61..d18c516e 100644 --- a/src/gprs_rlcmac.h +++ b/src/gprs_rlcmac.h @@ -52,6 +52,8 @@ struct gprs_rlcmac_tbf { uint8_t rlc_data[LLC_MAX_LEN]; uint16_t data_index; uint8_t bsn; + uint8_t trx, ts, tsc; + uint16_t arfcn, ta; struct osmo_timer_list timer; unsigned int T; /* Txxxx number */ @@ -66,13 +68,13 @@ extern struct llist_head gprs_rlcmac_tbfs; int tfi_alloc(); -struct gprs_rlcmac_tbf *tbf_alloc(uint8_t tfi); +struct gprs_rlcmac_tbf *tbf_alloc(uint8_t tfi, uint8_t trx, uint8_t ts); -static struct gprs_rlcmac_tbf *tbf_by_tfi(uint8_t tfi); +struct gprs_rlcmac_tbf *tbf_by_tfi(uint8_t tfi); -static struct gprs_rlcmac_tbf *tbf_by_tlli(uint8_t tlli); +struct gprs_rlcmac_tbf *tbf_by_tlli(uint8_t tlli); -static void tbf_free(struct gprs_rlcmac_tbf *tbf); +void tbf_free(struct gprs_rlcmac_tbf *tbf); /* TS 44.060 Section 10.4.7 Table 10.4.7.1: Payload Type field */ enum gprs_rlcmac_block_type { @@ -92,7 +94,10 @@ int gprs_rlcmac_rcv_control_block(bitvec *rlc_block); void gprs_rlcmac_rcv_block(bitvec *rlc_block); -int gprs_rlcmac_rcv_rach(uint8_t ra, uint32_t Fn, uint16_t ta); +void gprs_rlcmac_rcv_rts_block(uint8_t trx, uint8_t ts, uint16_t arfcn, + uint32_t fn, uint8_t block_nr); + +int gprs_rlcmac_rcv_rach(uint8_t ra, uint32_t Fn, int16_t qta); void gprs_rlcmac_tx_dl_data_block(uint32_t tlli, uint8_t tfi, uint8_t *pdu, int start_index, int end_index, uint8_t bsn, uint8_t fbi); diff --git a/src/pcu_l1_if.cpp b/src/pcu_l1_if.cpp index fe933b93..4836e940 100644 --- a/src/pcu_l1_if.cpp +++ b/src/pcu_l1_if.cpp @@ -17,12 +17,64 @@ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ +#include +#include #include #include #include +#include +#include +#include +#include +extern "C" { +#include +#include +#include +#include +#include +} #define MAX_UDP_LENGTH 1500 +#define msgb_l1prim(msg) ((GsmL1_Prim_t *)(msg)->l1h) + +struct femtol1_hdl { + struct gsm_time gsm_time; + uint32_t hLayer1; /* handle to the L1 instance in the DSP */ + uint32_t dsp_trace_f; + uint16_t clk_cal; + struct llist_head wlc_list; + + void *priv; /* user reference */ + + struct osmo_timer_list alive_timer; + unsigned int alive_prim_cnt; + + struct osmo_fd read_ofd; /* osmo file descriptors */ + struct osmo_wqueue write_q; + + struct { + uint16_t arfcn; + uint8_t tn; + uint8_t tsc; + uint16_t ta; + } channel_info; + +}; + +struct l1fwd_hdl { + struct sockaddr_storage remote_sa; + socklen_t remote_sa_len; + + struct osmo_wqueue udp_wq; + + struct femtol1_hdl *fl1h; +}; + +struct l1fwd_hdl *l1fh = talloc_zero(NULL, struct l1fwd_hdl); + +struct pcu_l1if_bts pcu_l1if_bts; + // Variable for storage current FN. int frame_number; @@ -46,34 +98,31 @@ struct msgb *l1p_msgb_alloc(void) return msg; } -struct msgb *gen_dummy_msg(void) +// Send RLC/MAC block to OpenBTS. +void pcu_l1if_tx_pdtch(msgb *msg, uint8_t trx, uint8_t ts, uint16_t arfcn, + uint32_t fn, uint8_t block_nr) { - struct msgb *msg = l1p_msgb_alloc(); - GsmL1_Prim_t *prim = msgb_l1prim(msg); - // RLC/MAC filler with USF=1 - bitvec *filler = bitvec_alloc(23); - bitvec_unhex(filler, "41942b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); + struct msgb *nmsg = l1p_msgb_alloc(); + GsmL1_Prim_t *prim = msgb_l1prim(nmsg); + prim->id = GsmL1_PrimId_PhDataReq; - prim->u.phDataReq.sapi = GsmL1_Sapi_Pacch; - bitvec_pack(filler, prim->u.phDataReq.msgUnitParam.u8Buffer); - prim->u.phDataReq.msgUnitParam.u8Size = filler->data_len; - bitvec_free(filler); - return msg; + prim->u.phDataReq.sapi = GsmL1_Sapi_Pdtch; + memcpy(prim->u.phDataReq.msgUnitParam.u8Buffer, msg->data, msg->len); + prim->u.phDataReq.msgUnitParam.u8Size = msg->len; + osmo_wqueue_enqueue(&l1fh->udp_wq, nmsg); + msgb_free(msg); } -// Send RLC/MAC block to OpenBTS. -void pcu_l1if_tx(bitvec * block, GsmL1_Sapi_t sapi, int len) +void pcu_l1if_tx_agch(bitvec * block, int len) { struct msgb *msg = l1p_msgb_alloc(); - struct osmo_wqueue * queue; - queue = &((l1fh->fl1h)->write_q); GsmL1_Prim_t *prim = msgb_l1prim(msg); prim->id = GsmL1_PrimId_PhDataReq; - prim->u.phDataReq.sapi = sapi; + prim->u.phDataReq.sapi = GsmL1_Sapi_Agch; bitvec_pack(block, prim->u.phDataReq.msgUnitParam.u8Buffer); prim->u.phDataReq.msgUnitParam.u8Size = len; - osmo_wqueue_enqueue(queue, msg); + osmo_wqueue_enqueue(&l1fh->udp_wq, msg); } int pcu_l1if_rx_pdch(GsmL1_PhDataInd_t *data_ind) @@ -82,31 +131,27 @@ int pcu_l1if_rx_pdch(GsmL1_PhDataInd_t *data_ind) bitvec_unpack(block, data_ind->msgUnitParam.u8Buffer); gprs_rlcmac_rcv_block(block); bitvec_free(block); + + return 0; } static int handle_ph_connect_ind(struct femtol1_hdl *fl1, GsmL1_PhConnectInd_t *connect_ind) { + pcu_l1if_bts.trx[0].arfcn = connect_ind->u16Arfcn; + pcu_l1if_bts.trx[0].ts[connect_ind->u8Tn].enable = 1; + pcu_l1if_bts.trx[0].ts[connect_ind->u8Tn].tsc = connect_ind->u8Tsc; (l1fh->fl1h)->channel_info.arfcn = connect_ind->u16Arfcn; (l1fh->fl1h)->channel_info.tn = connect_ind->u8Tn; (l1fh->fl1h)->channel_info.tsc = connect_ind->u8Tsc; LOGP(DL1IF, LOGL_NOTICE, "RX: [ PCU <- BTS ] PhConnectInd: ARFCN: %u TN: %u TSC: %u \n", connect_ind->u16Arfcn, (unsigned)connect_ind->u8Tn, (unsigned)connect_ind->u8Tsc); + + return 0; } static int handle_ph_readytosend_ind(struct femtol1_hdl *fl1, GsmL1_PhReadyToSendInd_t *readytosend_ind) { - struct msgb *resp_msg; - struct osmo_wqueue * queue; - queue = &((l1fh->fl1h)->write_q); - - set_current_fn(readytosend_ind->u32Fn); - resp_msg = msgb_dequeue(&queue->msg_queue); - if (!resp_msg) { - resp_msg = gen_dummy_msg(); - if (!resp_msg) - return 0; - } - osmo_wqueue_enqueue(&l1fh->udp_wq, resp_msg); + gprs_rlcmac_rcv_rts_block(0,0, (l1fh->fl1h)->channel_info.arfcn, readytosend_ind->u32Fn, 0); return 1; } @@ -172,3 +217,104 @@ int pcu_l1if_handle_l1prim(struct femtol1_hdl *fl1, struct msgb *msg) return rc; } + +/* OpenBTS socket functions */ + +// TODO: We should move this parameters to config file. +#define PCU_L1_IF_PORT 5944 + +/* data has arrived on the udp socket */ +static int udp_read_cb(struct osmo_fd *ofd) +{ + struct msgb *msg = msgb_alloc_headroom(2048, 128, "udp_rx"); + struct l1fwd_hdl *l1fh = (l1fwd_hdl *)ofd->data; + struct femtol1_hdl *fl1h = l1fh->fl1h; + int rc; + + if (!msg) + return -ENOMEM; + + msg->l1h = msg->data; + + l1fh->remote_sa_len = sizeof(l1fh->remote_sa); + rc = recvfrom(ofd->fd, msg->l1h, msgb_tailroom(msg), 0, + (struct sockaddr *) &l1fh->remote_sa, &l1fh->remote_sa_len); + if (rc < 0) { + perror("read from udp"); + msgb_free(msg); + return rc; + } else if (rc == 0) { + perror("len=0 read from udp"); + msgb_free(msg); + return rc; + } + msgb_put(msg, rc); + + rc = pcu_l1if_handle_l1prim(fl1h, msg); + return rc; +} + +/* callback when we can write to the UDP socket */ +static int udp_write_cb(struct osmo_fd *ofd, struct msgb *msg) +{ + int rc; + struct l1fwd_hdl *l1fh = (l1fwd_hdl *)ofd->data; + + //DEBUGP(DGPRS, "UDP: Writing %u bytes for MQ_L1_WRITE queue\n", msgb_l1len(msg)); + + rc = sendto(ofd->fd, msg->l1h, msgb_l1len(msg), 0, + (const struct sockaddr *)&l1fh->remote_sa, l1fh->remote_sa_len); + if (rc < 0) { + LOGP(DPCU, LOGL_ERROR, "error writing to L1 msg_queue: %s\n", + strerror(errno)); + return rc; + } else if (rc < (int)msgb_l1len(msg)) { + LOGP(DPCU, LOGL_ERROR, "short write to L1 msg_queue: " + "%u < %u\n", rc, msgb_l1len(msg)); + return -EIO; + } + + return 0; +} + +int pcu_l1if_open() +{ + //struct l1fwd_hdl *l1fh; + struct femtol1_hdl *fl1h; + int rc; + + memset(&pcu_l1if_bts, 0, sizeof(pcu_l1if_bts)); + + /* allocate new femtol1_handle */ + fl1h = talloc_zero(NULL, struct femtol1_hdl); + INIT_LLIST_HEAD(&fl1h->wlc_list); + + l1fh->fl1h = fl1h; + fl1h->priv = l1fh; + + struct osmo_wqueue * queue = &((l1fh->fl1h)->write_q); + osmo_wqueue_init(queue, 10); + queue->bfd.when |= BSC_FD_READ; + queue->bfd.data = l1fh; + queue->bfd.priv_nr = 0; + + /* Open UDP */ + struct osmo_wqueue *wq = &l1fh->udp_wq; + + osmo_wqueue_init(wq, 10); + wq->write_cb = udp_write_cb; + wq->read_cb = udp_read_cb; + wq->bfd.when |= BSC_FD_READ; + wq->bfd.data = l1fh; + wq->bfd.priv_nr = 0; + rc = osmo_sock_init_ofd(&wq->bfd, AF_UNSPEC, SOCK_DGRAM, + IPPROTO_UDP, NULL, PCU_L1_IF_PORT, + OSMO_SOCK_F_BIND); + if (rc < 0) { + perror("sock_init"); + exit(1); + } + + return 0; +} + diff --git a/src/pcu_l1_if.h b/src/pcu_l1_if.h index efe533e7..241f4943 100644 --- a/src/pcu_l1_if.h +++ b/src/pcu_l1_if.h @@ -20,58 +20,41 @@ #ifndef PCU_L1_IF_H #define PCU_L1_IF_H - -#include -#include -#include +#include extern "C" { #include #include #include +#include #include } -#define msgb_l1prim(msg) ((GsmL1_Prim_t *)(msg)->l1h) - -struct femtol1_hdl { - struct gsm_time gsm_time; - uint32_t hLayer1; /* handle to the L1 instance in the DSP */ - uint32_t dsp_trace_f; - uint16_t clk_cal; - struct llist_head wlc_list; - - void *priv; /* user reference */ - - struct osmo_timer_list alive_timer; - unsigned int alive_prim_cnt; - - struct osmo_fd read_ofd; /* osmo file descriptors */ - struct osmo_wqueue write_q; - - struct { - uint16_t arfcn; - uint8_t tn; - uint8_t tsc; - uint16_t ta; - } channel_info; - +struct pcu_l1if_ts { + uint8_t enable; + uint8_t tsc; }; -struct l1fwd_hdl { - struct sockaddr_storage remote_sa; - socklen_t remote_sa_len; - - struct osmo_wqueue udp_wq; - - struct femtol1_hdl *fl1h; +struct pcu_l1if_trx { + uint16_t arfcn; + struct pcu_l1if_ts ts[8]; }; -extern struct l1fwd_hdl *l1fh; +struct pcu_l1if_bts { + struct pcu_l1if_trx trx[8]; +}; + +extern struct pcu_l1if_bts pcu_l1if_bts; int get_current_fn(); +void set_current_fn(int fn); -void pcu_l1if_tx(bitvec * block, GsmL1_Sapi_t sapi, int len = 23); +void pcu_l1if_tx_pdtch(msgb *msg, uint8_t trx, uint8_t ts, uint16_t arfcn, + uint32_t fn, uint8_t block_nr); +void pcu_l1if_tx_ptcch(msgb *msg, uint8_t trx, uint8_t ts, uint16_t arfcn, + uint32_t fn, uint8_t block_nr); +void pcu_l1if_tx_agch(bitvec * block, int len); -int pcu_l1if_handle_l1prim(struct femtol1_hdl *fl1h, struct msgb *msg); +int pcu_l1if_open(void); +void pcu_l1if_close(void); #endif // PCU_L1_IF_H diff --git a/src/pcu_main.cpp b/src/pcu_main.cpp index f26c6d86..329f669f 100644 --- a/src/pcu_main.cpp +++ b/src/pcu_main.cpp @@ -27,9 +27,6 @@ #define SGSN_IP "127.0.0.1" #define SGSN_PORT 23000 #define NSVCI 4 -#define PCU_L1_IF_PORT 5944 - -struct l1fwd_hdl *l1fh = talloc_zero(NULL, struct l1fwd_hdl); int sgsn_ns_cb(enum gprs_ns_evt event, struct gprs_nsvc *nsvc, struct msgb *msg, uint16_t bvci) { @@ -49,97 +46,6 @@ int sgsn_ns_cb(enum gprs_ns_evt event, struct gprs_nsvc *nsvc, struct msgb *msg, return rc; } -/* data has arrived on the udp socket */ -static int udp_read_cb(struct osmo_fd *ofd) -{ - struct msgb *msg = msgb_alloc_headroom(2048, 128, "udp_rx"); - struct l1fwd_hdl *l1fh = (l1fwd_hdl *)ofd->data; - struct femtol1_hdl *fl1h = l1fh->fl1h; - int rc; - - if (!msg) - return -ENOMEM; - - msg->l1h = msg->data; - - l1fh->remote_sa_len = sizeof(l1fh->remote_sa); - rc = recvfrom(ofd->fd, msg->l1h, msgb_tailroom(msg), 0, - (struct sockaddr *) &l1fh->remote_sa, &l1fh->remote_sa_len); - if (rc < 0) { - perror("read from udp"); - msgb_free(msg); - return rc; - } else if (rc == 0) { - perror("len=0 read from udp"); - msgb_free(msg); - return rc; - } - msgb_put(msg, rc); - - rc = pcu_l1if_handle_l1prim(fl1h, msg); - return rc; -} - -/* callback when we can write to the UDP socket */ -static int udp_write_cb(struct osmo_fd *ofd, struct msgb *msg) -{ - int rc; - struct l1fwd_hdl *l1fh = (l1fwd_hdl *)ofd->data; - - //DEBUGP(DGPRS, "UDP: Writing %u bytes for MQ_L1_WRITE queue\n", msgb_l1len(msg)); - - rc = sendto(ofd->fd, msg->l1h, msgb_l1len(msg), 0, - (const struct sockaddr *)&l1fh->remote_sa, l1fh->remote_sa_len); - if (rc < 0) { - LOGP(DPCU, LOGL_ERROR, "error writing to L1 msg_queue: %s\n", - strerror(errno)); - return rc; - } else if (rc < msgb_l1len(msg)) { - LOGP(DPCU, LOGL_ERROR, "short write to L1 msg_queue: " - "%u < %u\n", rc, msgb_l1len(msg)); - return -EIO; - } - - return 0; -} - -int pcu_l1if_open() -{ - //struct l1fwd_hdl *l1fh; - struct femtol1_hdl *fl1h; - int rc; - - /* allocate new femtol1_handle */ - fl1h = talloc_zero(NULL, struct femtol1_hdl); - INIT_LLIST_HEAD(&fl1h->wlc_list); - - l1fh->fl1h = fl1h; - fl1h->priv = l1fh; - - struct osmo_wqueue * queue = &((l1fh->fl1h)->write_q); - osmo_wqueue_init(queue, 10); - queue->bfd.when |= BSC_FD_READ; - queue->bfd.data = l1fh; - queue->bfd.priv_nr = 0; - - /* Open UDP */ - struct osmo_wqueue *wq = &l1fh->udp_wq; - - osmo_wqueue_init(wq, 10); - wq->write_cb = udp_write_cb; - wq->read_cb = udp_read_cb; - wq->bfd.when |= BSC_FD_READ; - wq->bfd.data = l1fh; - wq->bfd.priv_nr = 0; - rc = osmo_sock_init_ofd(&wq->bfd, AF_UNSPEC, SOCK_DGRAM, - IPPROTO_UDP, NULL, PCU_L1_IF_PORT, - OSMO_SOCK_F_BIND); - if (rc < 0) { - perror("sock_init"); - exit(1); - } -} - int main(int argc, char *argv[]) { uint16_t nsvci = NSVCI; diff --git a/src/sysmo_l1_if.cpp b/src/sysmo_l1_if.cpp new file mode 100644 index 00000000..09a31495 --- /dev/null +++ b/src/sysmo_l1_if.cpp @@ -0,0 +1,562 @@ +/* sysmo_l1_if.cpp + * + * Copyright (C) 2012 Andreas Eversberg + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +extern "C" { +#include +#include +#include +} + +#include +#include +#include +#include "../../osmo-bts/include/osmo-bts/pcuif_proto.h" + +static int pcu_sock_send(struct msgb *msg); +static void pcu_sock_timeout(void *_priv); + +struct pcu_l1if_bts pcu_l1if_bts; + +// Variable for storage current FN. +int frame_number; + +int get_current_fn() +{ + return frame_number; +} + +void set_current_fn(int fn) +{ + frame_number = fn; +} + +/* + * PCU messages + */ + +struct msgb *pcu_msgb_alloc(uint8_t msg_type, uint8_t bts_nr) +{ + struct msgb *msg; + struct gsm_pcu_if *pcu_prim; + + msg = msgb_alloc(sizeof(struct gsm_pcu_if), "pcu_sock_tx"); + if (!msg) + return NULL; + msgb_put(msg, sizeof(struct gsm_pcu_if)); + pcu_prim = (struct gsm_pcu_if *) msg->data; + pcu_prim->msg_type = msg_type; + pcu_prim->bts_nr = bts_nr; + + return msg; +} + +static int pcu_tx_act_req(uint8_t trx, uint8_t ts, uint8_t activate) +{ + struct msgb *msg; + struct gsm_pcu_if *pcu_prim; + struct gsm_pcu_if_act_req *act_req; + + LOGP(DL1IF, LOGL_INFO, "Sending %s request: trx=%d ts=%d\n", + (activate) ? "activate" : "deactivate", trx, ts); + + msg = pcu_msgb_alloc(PCU_IF_MSG_ACT_REQ, 0); + if (!msg) + return -ENOMEM; + pcu_prim = (struct gsm_pcu_if *) msg->data; + act_req = &pcu_prim->u.act_req; + act_req->activate = activate; + act_req->trx_nr = trx; + act_req->ts_nr = ts; + + return pcu_sock_send(msg); +} + +static int pcu_tx_data_req(uint8_t trx, uint8_t ts, uint8_t sapi, + uint16_t arfcn, uint32_t fn, uint8_t block_nr, uint8_t *data, + uint8_t len) +{ + struct msgb *msg; + struct gsm_pcu_if *pcu_prim; + struct gsm_pcu_if_data *data_req; + + LOGP(DL1IF, LOGL_DEBUG, "Sending data request: trx=%d ts=%d sapi=%d " + "arfcn=%d fn=%d block=%d data=%s\n", trx, ts, sapi, arfcn, fn, + block_nr, osmo_hexdump(data, len)); + + msg = pcu_msgb_alloc(PCU_IF_MSG_DATA_REQ, 0); + if (!msg) + return -ENOMEM; + pcu_prim = (struct gsm_pcu_if *) msg->data; + data_req = &pcu_prim->u.data_req; + + data_req->sapi = sapi; + data_req->fn = fn; + data_req->arfcn = arfcn; + data_req->trx_nr = trx; + data_req->ts_nr = ts; + data_req->block_nr = block_nr; + memcpy(data_req->data, data, len); + data_req->len = len; + + return pcu_sock_send(msg); +} + +void pcu_l1if_tx_pdtch(msgb *msg, uint8_t trx, uint8_t ts, uint16_t arfcn, + uint32_t fn, uint8_t block_nr) +{ + pcu_tx_data_req(trx, ts, PCU_IF_SAPI_PDTCH, arfcn, fn, block_nr, + msg->data, msg->len); + msgb_free(msg); +} + +void pcu_l1if_tx_ptcch(msgb *msg, uint8_t trx, uint8_t ts, uint16_t arfcn, + uint32_t fn, uint8_t block_nr) +{ + pcu_tx_data_req(trx, ts, PCU_IF_SAPI_PTCCH, arfcn, fn, block_nr, + msg->data, msg->len); + msgb_free(msg); +} + +void pcu_l1if_tx_agch(bitvec * block, int len) +{ + uint8_t data[24]; /* prefix PLEN */ + + /* FIXME: why does OpenBTS has no PLEN and no fill in message? */ + bitvec_pack(block, data + 1); + data[0] = (len << 2) | 0x01; + pcu_tx_data_req(0, 0, PCU_IF_SAPI_AGCH, 0, 0, 0, data, 23); +} + +static void pcu_l1if_tx_bcch(uint8_t *data, int len) +{ + pcu_tx_data_req(0, 0, PCU_IF_SAPI_BCCH, 0, 0, 0, data, len); +} + +static int pcu_rx_data_ind(struct gsm_pcu_if_data *data_ind) +{ + int rc = 0; + bitvec *block; + + LOGP(DL1IF, LOGL_DEBUG, "Data indication received: sapi=%d arfcn=%d " + "block=%d data=%s\n", data_ind->sapi, + data_ind->arfcn, data_ind->block_nr, + osmo_hexdump(data_ind->data, data_ind->len)); + + switch (data_ind->sapi) { + case PCU_IF_SAPI_PDTCH: + block = bitvec_alloc(data_ind->len); + if (!block) { + rc = -ENOMEM; + break; + } + bitvec_unpack(block, data_ind->data); + gprs_rlcmac_rcv_block(block); + bitvec_free(block); + break; + default: + LOGP(DL1IF, LOGL_ERROR, "Received PCU data indication with " + "unsupported sapi %d\n", data_ind->sapi); + rc = -EINVAL; + } + + return rc; +} + +static int pcu_rx_rts_req(struct gsm_pcu_if_rts_req *rts_req) +{ + int rc = 0; + + LOGP(DL1IF, LOGL_DEBUG, "RTS request received: trx=%d ts=%d sapi=%d " + "arfcn=%d fn=%d block=%d\n", rts_req->trx_nr, rts_req->ts_nr, + rts_req->sapi, rts_req->arfcn, rts_req->fn, rts_req->block_nr); + + switch (rts_req->sapi) { + case PCU_IF_SAPI_PDTCH: + gprs_rlcmac_rcv_rts_block(rts_req->trx_nr, rts_req->ts_nr, + rts_req->arfcn, rts_req->fn, rts_req->block_nr); + break; + case PCU_IF_SAPI_PTCCH: + /* FIXME */ + { + struct msgb *msg = msgb_alloc(23, "l1_prim"); + memset(msgb_put(msg, 23), 0x2b, 23); + pcu_l1if_tx_ptcch(msg, rts_req->trx_nr, rts_req->ts_nr, + rts_req->arfcn, rts_req->fn, rts_req->block_nr); + } + break; + default: + LOGP(DL1IF, LOGL_ERROR, "Received PCU RTS request with " + "unsupported sapi %d\n", rts_req->sapi); + rc = -EINVAL; + } + + return rc; +} + +static int pcu_rx_rach_ind(struct gsm_pcu_if_rach_ind *rach_ind) +{ + int rc = 0; + + LOGP(DL1IF, LOGL_INFO, "RACH request received: sapi=%d " + "qta=%d, ra=%d, fn=%d\n", rach_ind->sapi, rach_ind->qta, + rach_ind->ra, rach_ind->fn); + + switch (rach_ind->sapi) { + case PCU_IF_SAPI_RACH: + rc = gprs_rlcmac_rcv_rach(rach_ind->ra, rach_ind->fn, + rach_ind->qta); + break; + default: + LOGP(DL1IF, LOGL_ERROR, "Received PCU rach request with " + "unsupported sapi %d\n", rach_ind->sapi); + rc = -EINVAL; + } + + return rc; +} + +static int pcu_rx_info_ind(struct gsm_pcu_if_info_ind *info_ind) +{ + int rc = 0; + int trx, ts; +// uint8_t si13[23]; + + LOGP(DL1IF, LOGL_INFO, "Info indication received:\n"); + + if (!(info_ind->flags & PCU_IF_FLAG_ACTIVE)) { + LOGP(DL1IF, LOGL_NOTICE, "BTS not available\n"); + return 0; + } + LOGP(DL1IF, LOGL_INFO, "BTS available\n"); + + for (trx = 0; trx < 8; trx++) { + pcu_l1if_bts.trx[trx].arfcn = info_ind->trx[trx].arfcn; + for (ts = 0; ts < 8; ts++) { + if ((info_ind->trx[trx].pdch_mask & (1 << ts))) { + /* FIXME: activate dynamically at RLCMAC */ + if (!pcu_l1if_bts.trx[trx].ts[ts].enable) + pcu_tx_act_req(trx, ts, 1); + pcu_l1if_bts.trx[trx].ts[ts].enable = 1; + pcu_l1if_bts.trx[trx].ts[ts].tsc = + info_ind->trx[trx].tsc[ts]; + LOGP(DL1IF, LOGL_INFO, "PDCH: trx=%d ts=%d\n", + trx, ts); + } else { + if (pcu_l1if_bts.trx[trx].ts[ts].enable) + pcu_tx_act_req(trx, ts, 0); + pcu_l1if_bts.trx[trx].ts[ts].enable = 0; + } + } + } + +#warning FIXME: RAC +// rc = generate_si13(si13, 0 /* rac */); +// printf("rc=%d\n", rc); +// pcu_l1if_tx_bcch(si13, 23); + + return rc; +} + +static int pcu_rx(uint8_t msg_type, struct gsm_pcu_if *pcu_prim) +{ + int rc = 0; + + switch (msg_type) { + case PCU_IF_MSG_DATA_IND: + rc = pcu_rx_data_ind(&pcu_prim->u.data_ind); + break; + case PCU_IF_MSG_RTS_REQ: + rc = pcu_rx_rts_req(&pcu_prim->u.rts_req); + break; + case PCU_IF_MSG_RACH_IND: + rc = pcu_rx_rach_ind(&pcu_prim->u.rach_ind); + break; + case PCU_IF_MSG_INFO_IND: + rc = pcu_rx_info_ind(&pcu_prim->u.info_ind); + break; + default: + LOGP(DL1IF, LOGL_ERROR, "Received unknwon PCU msg type %d\n", + msg_type); + rc = -EINVAL; + } + + return rc; +} + +/* + * SYSMO-PCU socket functions + */ + +struct pcu_sock_state { + struct osmo_fd conn_bfd; /* fd for connection to lcr */ + struct osmo_timer_list timer; /* socket connect retry timer */ + struct llist_head upqueue; /* queue for sending messages */ +} *pcu_sock_state = NULL; + +static int pcu_sock_send(struct msgb *msg) +{ + struct pcu_sock_state *state = pcu_sock_state; + struct osmo_fd *conn_bfd; + + if (!state) { + LOGP(DL1IF, LOGL_NOTICE, "PCU socket not created, dropping " + "message\n"); + return -EINVAL; + } + conn_bfd = &state->conn_bfd; + if (conn_bfd->fd <= 0) { + LOGP(DL1IF, LOGL_NOTICE, "PCU socket not connected, dropping " + "message\n"); + return -EIO; + } + msgb_enqueue(&state->upqueue, msg); + conn_bfd->when |= BSC_FD_WRITE; + + return 0; +} + +static void pcu_sock_close(struct pcu_sock_state *state) +{ + struct osmo_fd *bfd = &state->conn_bfd; + + LOGP(DL1IF, LOGL_NOTICE, "PCU socket has LOST connection\n"); + + close(bfd->fd); + bfd->fd = -1; + osmo_fd_unregister(bfd); + + /* flush the queue */ + while (!llist_empty(&state->upqueue)) { + struct msgb *msg = msgb_dequeue(&state->upqueue); + msgb_free(msg); + } + + /* disable all slots */ + memset(&pcu_l1if_bts, 0, sizeof(pcu_l1if_bts)); + + state->timer.cb = pcu_sock_timeout; + osmo_timer_schedule(&state->timer, 5, 0); +} + +static int pcu_sock_read(struct osmo_fd *bfd) +{ + struct pcu_sock_state *state = (struct pcu_sock_state *)bfd->data; + struct gsm_pcu_if *pcu_prim; + struct msgb *msg; + int rc; + + msg = msgb_alloc(sizeof(*pcu_prim), "pcu_sock_rx"); + if (!msg) + return -ENOMEM; + + pcu_prim = (struct gsm_pcu_if *) msg->tail; + + rc = recv(bfd->fd, msg->tail, msgb_tailroom(msg), 0); + if (rc == 0) + goto close; + + if (rc < 0) { + if (errno == EAGAIN) + return 0; + goto close; + } + + rc = pcu_rx(pcu_prim->msg_type, pcu_prim); + + /* as we always synchronously process the message in pcu_rx() and + * its callbacks, we can free the message here. */ + msgb_free(msg); + + return rc; + +close: + msgb_free(msg); + pcu_sock_close(state); + return -1; +} + +static int pcu_sock_write(struct osmo_fd *bfd) +{ + struct pcu_sock_state *state = (struct pcu_sock_state *)bfd->data; + int rc; + + while (!llist_empty(&state->upqueue)) { + struct msgb *msg, *msg2; + struct gsm_pcu_if *pcu_prim; + + /* peek at the beginning of the queue */ + msg = llist_entry(state->upqueue.next, struct msgb, list); + pcu_prim = (struct gsm_pcu_if *)msg->data; + + bfd->when &= ~BSC_FD_WRITE; + + /* bug hunter 8-): maybe someone forgot msgb_put(...) ? */ + if (!msgb_length(msg)) { + LOGP(DL1IF, LOGL_ERROR, "message type (%d) with ZERO " + "bytes!\n", pcu_prim->msg_type); + goto dontsend; + } + + /* try to send it over the socket */ + rc = write(bfd->fd, msgb_data(msg), msgb_length(msg)); + if (rc == 0) + goto close; + if (rc < 0) { + if (errno == EAGAIN) { + bfd->when |= BSC_FD_WRITE; + break; + } + goto close; + } + +dontsend: + /* _after_ we send it, we can deueue */ + msg2 = msgb_dequeue(&state->upqueue); + assert(msg == msg2); + msgb_free(msg); + } + return 0; + +close: + pcu_sock_close(state); + + return -1; +} + +static int pcu_sock_cb(struct osmo_fd *bfd, unsigned int flags) +{ + int rc = 0; + + if (flags & BSC_FD_READ) + rc = pcu_sock_read(bfd); + if (rc < 0) + return rc; + + if (flags & BSC_FD_WRITE) + rc = pcu_sock_write(bfd); + + return rc; +} + +int pcu_l1if_open(void) +{ + struct pcu_sock_state *state; + struct osmo_fd *bfd; + struct sockaddr_un local; + unsigned int namelen; + int rc; + + memset(&pcu_l1if_bts, 0, sizeof(pcu_l1if_bts)); + + state = pcu_sock_state; + if (!state) { + state = talloc_zero(NULL, struct pcu_sock_state); + if (!state) + return -ENOMEM; + INIT_LLIST_HEAD(&state->upqueue); + } + + bfd = &state->conn_bfd; + + bfd->fd = socket(AF_UNIX, SOCK_SEQPACKET, 0); + if (bfd->fd < 0) { + LOGP(DL1IF, LOGL_ERROR, "Failed to create PCU-SYSMO socket.\n"); + talloc_free(state); + return -1; + } + + local.sun_family = AF_UNIX; + strncpy(local.sun_path, "/tmp/pcu_bts", sizeof(local.sun_path)); + local.sun_path[sizeof(local.sun_path) - 1] = '\0'; + + /* we use the same magic that X11 uses in Xtranssock.c for + * calculating the proper length of the sockaddr */ +#if defined(BSD44SOCKETS) || defined(__UNIXWARE__) + local.sun_len = strlen(local.sun_path); +#endif +#if defined(BSD44SOCKETS) || defined(SUN_LEN) + namelen = SUN_LEN(&local); +#else + namelen = strlen(local.sun_path) + + offsetof(struct sockaddr_un, sun_path); +#endif + rc = connect(bfd->fd, (struct sockaddr *) &local, namelen); + if (rc != 0) { + LOGP(DL1IF, LOGL_ERROR, "Failed to Connect the PCU-SYSMO " + "socket, delaying... '%s'\n", local.sun_path); + close(bfd->fd); + bfd->fd = -1; + state->timer.cb = pcu_sock_timeout; + osmo_timer_schedule(&state->timer, 5, 0); + return -1; + } + + bfd->when = BSC_FD_READ; + bfd->cb = pcu_sock_cb; + bfd->data = state; + + rc = osmo_fd_register(bfd); + if (rc < 0) { + LOGP(DL1IF, LOGL_ERROR, "Could not register PCU fd: %d\n", rc); + close(bfd->fd); + talloc_free(state); + return rc; + } + + LOGP(DL1IF, LOGL_NOTICE, "PCU-SYSMO socket has been connected\n"); + + pcu_sock_state = state; + + return 0; +} + +void pcu_l1if_close(void) +{ + struct pcu_sock_state *state = pcu_sock_state; + struct osmo_fd *bfd; + + if (!state) + return; + + if (osmo_timer_pending(&state->timer)) + osmo_timer_del(&state->timer); + + bfd = &state->conn_bfd; + if (bfd->fd > 0) + pcu_sock_close(state); + talloc_free(state); + pcu_sock_state = NULL; +} + +static void pcu_sock_timeout(void *_priv) +{ + pcu_l1if_open(); +} + + + +