pcu_sock: add basic pcu interface support
Adds a basic version of a pcu socket interface, similar
to the one that can be found in osmo-bts.
Change-Id: Ib13cb4099d12fa71e9e0b8727e19ab29e11909b2
diff --git a/openbsc/src/libbsc/abis_rsl.c b/openbsc/src/libbsc/abis_rsl.c
index 20dd2b5..62c12a8 100644
--- a/openbsc/src/libbsc/abis_rsl.c
+++ b/openbsc/src/libbsc/abis_rsl.c
@@ -45,6 +45,7 @@
#include <osmocom/abis/e1_input.h>
#include <osmocom/gsm/rsl.h>
#include <osmocom/core/talloc.h>
+#include <openbsc/pcu_if.h>
#define RSL_ALLOC_SIZE 1024
#define RSL_ALLOC_HEADROOM 128
@@ -1285,6 +1286,12 @@
send_lchan_signal(S_LCHAN_ACTIVATE_ACK, lchan, NULL);
+ /* Update bts attributes inside the PCU */
+ if (ts->pchan == GSM_PCHAN_TCH_F_TCH_H_PDCH ||
+ ts->pchan == GSM_PCHAN_TCH_F_PDCH ||
+ ts->pchan == GSM_PCHAN_PDCH)
+ pcu_info_update(ts->trx->bts);
+
return 0;
}
@@ -1768,6 +1775,39 @@
return rsl_imm_assign_cmd(bts, sizeof(*iar), (uint8_t *) iar);
}
+/* Handle packet channel rach requests */
+static int rsl_rx_pchan_rqd(struct msgb *msg, struct gsm_bts *bts)
+{
+ struct gsm48_req_ref *rqd_ref;
+ struct abis_rsl_dchan_hdr *rqd_hdr = msgb_l2(msg);
+ rqd_ref = (struct gsm48_req_ref *) &rqd_hdr->data[1];
+ uint8_t ra = rqd_ref->ra;
+ uint8_t t1, t2, t3;
+ uint32_t fn;
+ uint8_t rqd_ta;
+ uint8_t is_11bit;
+
+ /* Process rach request and forward contained information to PCU */
+ if (ra == 0x7F) {
+ is_11bit = 1;
+
+ /* FIXME: Also handle 11 bit rach requests */
+ LOGP(DRSL, LOGL_ERROR, "BTS %d eleven bit access burst not supported yet!\n",bts->nr);
+ return -EINVAL;
+ } else {
+ is_11bit = 0;
+ t1 = rqd_ref->t1;
+ t2 = rqd_ref->t2;
+ t3 = rqd_ref->t3_low | (rqd_ref->t3_high << 3);
+ fn = (51 * ((t3-t2) % 26) + t3 + 51 * 26 * t1);
+
+ rqd_ta = rqd_hdr->data[sizeof(struct gsm48_req_ref)+2];
+ }
+
+ return pcu_tx_rach_ind(bts, rqd_ta, ra, fn, is_11bit,
+ GSM_L1_BURST_TYPE_ACCESS_0);
+}
+
/* MS has requested a channel on the RACH */
static int rsl_rx_chan_rqd(struct msgb *msg)
{
@@ -1795,10 +1835,20 @@
return -EINVAL;
rqd_ta = rqd_hdr->data[sizeof(struct gsm48_req_ref)+2];
+ /* Determine channel request cause code */
+ chreq_reason = get_reason_by_chreq(rqd_ref->ra, bts->network->neci);
+ LOGP(DRSL, LOGL_NOTICE, "BTS %d CHAN RQD: reason: %s (ra=0x%02x, neci=0x%02x, chreq_reason=0x%02x)\n",
+ msg->lchan->ts->trx->bts->nr,
+ get_value_string(gsm_chreq_descs, chreq_reason),
+ rqd_ref->ra, bts->network->neci, chreq_reason);
+
+ /* Handle PDCH related rach requests (in case of BSC-co-located-PCU */
+ if (chreq_reason == GSM_CHREQ_REASON_PDCH)
+ return rsl_rx_pchan_rqd(msg, bts);
+
/* determine channel type (SDCCH/TCH_F/TCH_H) based on
* request reference RA */
lctype = get_ctype_by_chreq(bts->network, rqd_ref->ra);
- chreq_reason = get_reason_by_chreq(rqd_ref->ra, bts->network->neci);
rate_ctr_inc(&bts->network->bsc_ctrs->ctr[BSC_CTR_CHREQ_TOTAL]);