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.
diff --git a/src/Makefile.am b/src/Makefile.am
index 1728c9e..db1f87f 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -33,10 +33,17 @@
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 82e483c..f40d2a6 100644
--- a/src/gprs_bssgp_pcu.cpp
+++ b/src/gprs_bssgp_pcu.cpp
@@ -38,7 +38,8 @@
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 7e9a032..c50e7ae 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 @@
}
/* 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 @@
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 @@
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 @@
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 @@
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 @@
// 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 @@
// 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 @@
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 @@
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 @@
}
}
-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 @@
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 @@
start_index += block_data_len;
}
}
+
+ return 0;
}
/* Send Uplink unit-data to SGSN. */
@@ -812,8 +879,8 @@
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 @@
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 eb651c6..d18c516 100644
--- a/src/gprs_rlcmac.h
+++ b/src/gprs_rlcmac.h
@@ -52,6 +52,8 @@
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 @@
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 @@
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 fe933b9..4836e94 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 <errno.h>
+#include <string.h>
#include <gprs_rlcmac.h>
#include <pcu_l1_if.h>
#include <gprs_debug.h>
+#include <bitvector.h>
+#include <gsmL1prim.h>
+#include <sys/socket.h>
+#include <linux/in.h>
+extern "C" {
+#include <osmocom/core/talloc.h>
+#include <osmocom/core/write_queue.h>
+#include <osmocom/core/socket.h>
+#include <osmocom/core/timer.h>
+#include <osmocom/gsm/gsm_utils.h>
+}
#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 @@
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 @@
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 @@
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 efe533e..241f494 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 <bitvector.h>
-#include <gsmL1prim.h>
-#include <sys/socket.h>
+#include <stdint.h>
extern "C" {
#include <osmocom/core/write_queue.h>
#include <osmocom/core/socket.h>
#include <osmocom/core/timer.h>
+#include <osmocom/core/bitvec.h>
#include <osmocom/gsm/gsm_utils.h>
}
-#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 f26c6d8..329f669 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 @@
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 0000000..09a3149
--- /dev/null
+++ b/src/sysmo_l1_if.cpp
@@ -0,0 +1,562 @@
+/* sysmo_l1_if.cpp
+ *
+ * Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu>
+ *
+ * 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 <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <assert.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+extern "C" {
+#include <osmocom/core/talloc.h>
+#include <osmocom/core/select.h>
+#include <osmocom/core/msgb.h>
+}
+
+#include <gprs_rlcmac.h>
+#include <pcu_l1_if.h>
+#include <gprs_debug.h>
+#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();
+}
+
+
+
+