fixeria has uploaded this change for review.
trxcon: allow populating global SACCH cache via L1CTL
Change-Id: I0f467fc07cf844cc73465f235b36ba7d00788c9f
Related: OS#5635, OS#5599
---
M src/host/trxcon/include/osmocom/bb/l1sched/l1sched.h
M src/host/trxcon/include/osmocom/bb/trxcon/trxcon.h
M src/host/trxcon/src/l1ctl.c
M src/host/trxcon/src/sched_prim.c
M src/host/trxcon/src/sched_trx.c
M src/host/trxcon/src/trxcon_fsm.c
6 files changed, 75 insertions(+), 63 deletions(-)
git pull ssh://gerrit.osmocom.org:29418/osmocom-bb refs/changes/74/28874/1
diff --git a/src/host/trxcon/include/osmocom/bb/l1sched/l1sched.h b/src/host/trxcon/include/osmocom/bb/l1sched/l1sched.h
index 3f7dae0..04303f0 100644
--- a/src/host/trxcon/include/osmocom/bb/l1sched/l1sched.h
+++ b/src/host/trxcon/include/osmocom/bb/l1sched/l1sched.h
@@ -374,6 +374,8 @@
void (*clock_cb)(struct l1sched_state *sched);
/*! List of timeslots maintained by this scheduler */
struct l1sched_ts *ts[TRX_TS_COUNT];
+ /*! SACCH cache (common for all lchans) */
+ uint8_t sacch_cache[GSM_MACBLOCK_LEN];
/*! BSIC value learned from SCH bursts */
uint8_t bsic;
/*! Logging context (used as prefix for messages) */
diff --git a/src/host/trxcon/include/osmocom/bb/trxcon/trxcon.h b/src/host/trxcon/include/osmocom/bb/trxcon/trxcon.h
index 6a43bcb..430b26e 100644
--- a/src/host/trxcon/include/osmocom/bb/trxcon/trxcon.h
+++ b/src/host/trxcon/include/osmocom/bb/trxcon/trxcon.h
@@ -25,6 +25,7 @@
TRXCON_EV_SET_TCH_MODE_REQ,
TRXCON_EV_PHY_CONFIG_REQ,
TRXCON_EV_TX_ACCESS_BURST_REQ,
+ TRXCON_EV_UPDATE_SACCH_CACHE_REQ,
TRXCON_EV_DEDICATED_ESTABLISH_REQ,
TRXCON_EV_DEDICATED_RELEASE_REQ,
TRXCON_EV_TX_TRAFFIC_REQ,
diff --git a/src/host/trxcon/src/l1ctl.c b/src/host/trxcon/src/l1ctl.c
index b907917..c6939f5 100644
--- a/src/host/trxcon/src/l1ctl.c
+++ b/src/host/trxcon/src/l1ctl.c
@@ -644,10 +644,18 @@
"Recv %s Req (chan_nr=0x%02x, link_id=0x%02x, len=%zu)\n",
traffic ? "TRAFFIC" : "DATA", req.chan_nr, req.link_id, req.data_len);
- if (traffic)
- osmo_fsm_inst_dispatch(trxcon->fi, TRXCON_EV_TX_TRAFFIC_REQ, &req);
- else
- osmo_fsm_inst_dispatch(trxcon->fi, TRXCON_EV_TX_DATA_REQ, &req);
+ switch (trxcon->fi->state) {
+ case TRXCON_ST_DEDICATED:
+ if (traffic)
+ osmo_fsm_inst_dispatch(trxcon->fi, TRXCON_EV_TX_TRAFFIC_REQ, &req);
+ else
+ osmo_fsm_inst_dispatch(trxcon->fi, TRXCON_EV_TX_DATA_REQ, &req);
+ break;
+ default:
+ if (!traffic && req.link_id == 0x40)
+ osmo_fsm_inst_dispatch(trxcon->fi, TRXCON_EV_UPDATE_SACCH_CACHE_REQ, &req);
+ /* TODO: log an error about uhnandled DATA.req / TRAFFIC.req */
+ }
msgb_free(msg);
return 0;
diff --git a/src/host/trxcon/src/sched_prim.c b/src/host/trxcon/src/sched_prim.c
index 9b6d28d..f97e505 100644
--- a/src/host/trxcon/src/sched_prim.c
+++ b/src/host/trxcon/src/sched_prim.c
@@ -116,8 +116,7 @@
}
/**
- * Composes a new primitive using either cached (if populated),
- * or "dummy" Measurement Report message.
+ * Composes a new primitive from cached RR Measurement Report.
*
* @param lchan lchan to assign a primitive
* @return SACCH primitive to be transmitted
@@ -125,38 +124,8 @@
static struct l1sched_ts_prim *prim_compose_mr(struct l1sched_lchan_state *lchan)
{
struct l1sched_ts_prim *prim;
- uint8_t *mr_src_ptr;
bool cached;
- /* "Dummy" Measurement Report */
- static const uint8_t meas_rep_dummy[] = {
- /* L1 SACCH pseudo-header */
- 0x0f, 0x00,
-
- /* LAPDm header */
- 0x01, 0x03, 0x49,
-
- /* RR Management messages, Measurement Report */
- 0x06, 0x15,
-
- /* Measurement results (see 3GPP TS 44.018, section 10.5.2.20):
- * 0... .... = BA-USED: 0
- * .0.. .... = DTX-USED: DTX was not used
- * ..11 0110 = RXLEV-FULL-SERVING-CELL: -57 <= x < -56 dBm (54)
- * 0... .... = 3G-BA-USED: 0
- * .1.. .... = MEAS-VALID: The measurement results are not valid
- * ..11 0110 = RXLEV-SUB-SERVING-CELL: -57 <= x < -56 dBm (54)
- * 0... .... = SI23_BA_USED: 0
- * .000 .... = RXQUAL-FULL-SERVING-CELL: BER < 0.2%, Mean value 0.14% (0)
- * .... 000. = RXQUAL-SUB-SERVING-CELL: BER < 0.2%, Mean value 0.14% (0)
- * .... ...1 11.. .... = NO-NCELL-M: Neighbour cell information not available */
- 0x36, 0x76, 0x01, 0xc0,
-
- /* 0** -- Padding with zeroes */
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- };
-
/* Allocate a new primitive */
prim = prim_alloc(lchan, GSM_MACBLOCK_LEN, L1SCHED_PRIM_DATA,
l1sched_lchan_desc[lchan->type].chan_nr,
@@ -167,43 +136,24 @@
cached = (lchan->sacch.mr_cache[2] != 0x00
&& lchan->sacch.mr_cache[3] != 0x00
&& lchan->sacch.mr_cache[4] != 0x00);
- if (cached) { /* Use the cached one */
- mr_src_ptr = lchan->sacch.mr_cache;
- lchan->sacch.mr_cache_usage++;
- } else { /* Use "dummy" one */
- mr_src_ptr = (uint8_t *) meas_rep_dummy;
+ if (!cached) {
+ memcpy(&lchan->sacch.mr_cache[0],
+ &lchan->ts->sched->sacch_cache[0],
+ sizeof(lchan->sacch.mr_cache));
}
/* Compose a new Measurement Report primitive */
- memcpy(prim->payload, mr_src_ptr, GSM_MACBLOCK_LEN);
-
- /**
- * Update the L1 SACCH pseudo-header (only for cached MRs)
- *
- * TODO: filling of the actual values into cached Measurement
- * Reports would break the distance spoofing feature. If it
- * were known whether the spoofing is enabled or not, we could
- * decide whether to update the cached L1 SACCH header here.
- */
- if (!cached) {
-#warning "FIXME: no direct access to trxcon->l1p.{tx_power,ta}"
-#if 0
- prim->payload[0] = lchan->ts->sched->trx->tx_power;
- prim->payload[1] = lchan->ts->sched->trx->ta;
-#endif
- }
+ memcpy(&prim->payload[0], &lchan->sacch.mr_cache[0], GSM_MACBLOCK_LEN);
/* Inform about the cache usage count */
- if (cached && lchan->sacch.mr_cache_usage > 5) {
+ if (++lchan->sacch.mr_cache_usage > 5) {
LOGP_LCHAND(lchan, LOGL_NOTICE,
"SACCH MR cache usage count=%u > 5 "
"=> ancient measurements, please fix!\n",
lchan->sacch.mr_cache_usage);
}
- LOGP_LCHAND(lchan, LOGL_NOTICE,
- "Using a %s Measurement Report\n",
- cached ? "cached" : "dummy");
+ LOGP_LCHAND(lchan, LOGL_NOTICE, "Using cached Measurement Report\n");
return prim;
}
diff --git a/src/host/trxcon/src/sched_trx.c b/src/host/trxcon/src/sched_trx.c
index 10a4c5f..00adcd6 100644
--- a/src/host/trxcon/src/sched_trx.c
+++ b/src/host/trxcon/src/sched_trx.c
@@ -39,6 +39,35 @@
int l1sched_log_cat_common = DLGLOBAL;
int l1sched_log_cat_data = DLGLOBAL;
+/* "Dummy" Measurement Report */
+static const uint8_t meas_rep_dummy[] = {
+ /* L1 SACCH pseudo-header */
+ 0x0f, 0x00,
+
+ /* LAPDm header */
+ 0x01, 0x03, 0x49,
+
+ /* RR Management messages, Measurement Report */
+ 0x06, 0x15,
+
+ /* Measurement results (see 3GPP TS 44.018, section 10.5.2.20):
+ * 0... .... = BA-USED: 0
+ * .0.. .... = DTX-USED: DTX was not used
+ * ..11 0110 = RXLEV-FULL-SERVING-CELL: -57 <= x < -56 dBm (54)
+ * 0... .... = 3G-BA-USED: 0
+ * .1.. .... = MEAS-VALID: The measurement results are not valid
+ * ..11 0110 = RXLEV-SUB-SERVING-CELL: -57 <= x < -56 dBm (54)
+ * 0... .... = SI23_BA_USED: 0
+ * .000 .... = RXQUAL-FULL-SERVING-CELL: BER < 0.2%, Mean value 0.14% (0)
+ * .... 000. = RXQUAL-SUB-SERVING-CELL: BER < 0.2%, Mean value 0.14% (0)
+ * .... ...1 11.. .... = NO-NCELL-M: Neighbour cell information not available */
+ 0x36, 0x76, 0x01, 0xc0,
+
+ /* 0** -- Padding with zeroes */
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+};
+
static int l1sched_cfg_pchan_comb_req(struct l1sched_state *sched,
uint8_t tn, enum gsm_phys_chan_config pchan)
{
@@ -175,6 +204,8 @@
.priv = priv,
};
+ memcpy(&sched->sacch_cache[0], &meas_rep_dummy[0], sizeof(meas_rep_dummy));
+
if (cfg->log_prefix == NULL)
sched->log_prefix = talloc_asprintf(sched, "l1sched[0x%p]: ", sched);
else
@@ -217,6 +248,8 @@
/* Stop and reset clock counter if required */
if (reset_clock)
l1sched_clck_reset(sched);
+
+ memcpy(&sched->sacch_cache[0], &meas_rep_dummy[0], sizeof(meas_rep_dummy));
}
struct l1sched_ts *l1sched_add_ts(struct l1sched_state *sched, int tn)
diff --git a/src/host/trxcon/src/trxcon_fsm.c b/src/host/trxcon/src/trxcon_fsm.c
index fb9bd8f..b5a153a 100644
--- a/src/host/trxcon/src/trxcon_fsm.c
+++ b/src/host/trxcon/src/trxcon_fsm.c
@@ -82,6 +82,22 @@
}
break;
}
+ case TRXCON_EV_UPDATE_SACCH_CACHE_REQ:
+ {
+ const struct trxcon_param_tx_traffic_data_req *req = data;
+
+ if (req->link_id != L1SCHED_CH_LID_SACCH) {
+ LOGPFSML(fi, LOGL_ERROR, "Unexpected link_id=%u\n", req->link_id);
+ break;
+ }
+ if (req->data_len != GSM_MACBLOCK_LEN) {
+ LOGPFSML(fi, LOGL_ERROR, "Unexpected data length=%u\n", req->data_len);
+ break;
+ }
+
+ memcpy(&trxcon->sched->sacch_cache[0], req->data, req->data_len);
+ break;
+ }
default:
OSMO_ASSERT(0);
}
@@ -483,6 +499,7 @@
OSMO_VALUE_STRING(TRXCON_EV_SET_TCH_MODE_REQ),
OSMO_VALUE_STRING(TRXCON_EV_PHY_CONFIG_REQ),
OSMO_VALUE_STRING(TRXCON_EV_TX_ACCESS_BURST_REQ),
+ OSMO_VALUE_STRING(TRXCON_EV_UPDATE_SACCH_CACHE_REQ),
OSMO_VALUE_STRING(TRXCON_EV_DEDICATED_ESTABLISH_REQ),
OSMO_VALUE_STRING(TRXCON_EV_DEDICATED_RELEASE_REQ),
OSMO_VALUE_STRING(TRXCON_EV_TX_TRAFFIC_REQ),
@@ -503,7 +520,8 @@
| S(TRXCON_EV_L2IF_FAILURE)
| S(TRXCON_EV_RESET_FULL_REQ)
| S(TRXCON_EV_RESET_SCHED_REQ)
- | S(TRXCON_EV_PHY_CONFIG_REQ),
+ | S(TRXCON_EV_PHY_CONFIG_REQ)
+ | S(TRXCON_EV_UPDATE_SACCH_CACHE_REQ),
.allstate_action = &trxcon_allstate_action,
.timer_cb = &trxcon_timer_cb,
.pre_term = &trxcon_fsm_pre_term_cb,
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