[PATCH] osmo-bsc[master]: abis-rsl: Send imm.ass messages via PCH

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lynxis lazus gerrit-no-reply at lists.osmocom.org
Tue Jan 30 15:30:31 UTC 2018


Review at  https://gerrit.osmocom.org/6203

abis-rsl: Send imm.ass messages via PCH

It is possible to send immidiate assign messages through the
paging channel. This commit adds the required functionality to
the pcu socket interface and to the abis_rsl api

Change-Id: I0a899d9c866ed09dc301694dbbcad304b1ed49e5
---
M include/osmocom/bsc/abis_rsl.h
M include/osmocom/bsc/pcuif_proto.h
M src/libbsc/abis_rsl.c
M src/libbsc/pcu_sock.c
4 files changed, 61 insertions(+), 19 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/osmo-bsc refs/changes/03/6203/1

diff --git a/include/osmocom/bsc/abis_rsl.h b/include/osmocom/bsc/abis_rsl.h
index b30702f..ae80879 100644
--- a/include/osmocom/bsc/abis_rsl.h
+++ b/include/osmocom/bsc/abis_rsl.h
@@ -60,7 +60,11 @@
 int rsl_relase_request(struct gsm_lchan *lchan, uint8_t link_id);
 
 /* Ericcson vendor specific RSL extensions */
-int rsl_ericsson_imm_assign_cmd(struct gsm_bts *bts, uint32_t tlli, uint8_t len, uint8_t *val);
+int rsl_ericsson_imm_assign_cmd(struct gsm_bts *bts, uint8_t len, uint8_t *val,
+				uint32_t tlli);
+int rsl_ericsson_imm_assign_via_pch_cmd(struct gsm_bts *bts, uint8_t len,
+					uint8_t *val, uint32_t tlli,
+					uint8_t pag_grp);
 
 /* Siemens vendor-specific RSL extensions */
 int rsl_siemens_mrpci(struct gsm_lchan *lchan, struct rsl_mrpci *mrpci);
diff --git a/include/osmocom/bsc/pcuif_proto.h b/include/osmocom/bsc/pcuif_proto.h
index eb28d66..0dbb6c2 100644
--- a/include/osmocom/bsc/pcuif_proto.h
+++ b/include/osmocom/bsc/pcuif_proto.h
@@ -23,7 +23,7 @@
 #define PCU_IF_SAPI_PDTCH	0x05	/* packet data/control/ccch block */
 #define PCU_IF_SAPI_PRACH	0x06	/* packet random access channel */
 #define PCU_IF_SAPI_PTCCH	0x07	/* packet TA control channel */
-#define PCU_IF_SAPI_AGCH_DT	0x08	/* assignment on AGCH but with additional TLLI */
+#define PCU_IF_SAPI_AGCH_DT	0x08	/* assignment on PCH or AGCH but with additional TLLI */
 
 /* flags */
 #define PCU_IF_FLAG_ACTIVE	(1 << 0)/* BTS is active */
@@ -61,6 +61,7 @@
 struct gsm_pcu_if_data_cnf_dt {
 	uint8_t		sapi;
 	uint32_t	tlli;
+	uint8_t		imsi[3];
 	uint32_t	fn;
 	uint16_t	arfcn;
 	uint8_t		trx_nr;
diff --git a/src/libbsc/abis_rsl.c b/src/libbsc/abis_rsl.c
index eced0e2..de39f95 100644
--- a/src/libbsc/abis_rsl.c
+++ b/src/libbsc/abis_rsl.c
@@ -1095,17 +1095,42 @@
 	return abis_rsl_sendmsg(msg);
 }
 
-/* Chapter 8.5.6 */
-int rsl_ericsson_imm_assign_cmd(struct gsm_bts *bts, uint32_t tlli, uint8_t len, uint8_t *val)
+/* Append mobile idenitiy (tlli) to message buffer */
+static void rsl_ericsson_put_mi(struct msgb *msg, uint32_t tlli)
+{
+	/* NOTE: ericsson can handle a reference at the end of the message which is used in
+	 * the confirm message. The confirm message is only sent if the trailer is present */
+	msgb_put_u8(msg, RSL_IE_ERIC_MOBILE_ID);
+	msgb_put_u32(msg, tlli);
+}
+
+/* Chapter 8.5.6 (Ericcson vendor specific RSL extension) */
+int rsl_ericsson_imm_assign_cmd(struct gsm_bts *bts, uint8_t len, uint8_t *val,
+				uint32_t tlli)
 {
 	struct msgb *msg = rsl_imm_assign_cmd_common(bts, len, val);
 	if (!msg)
 		return 1;
 
-	/* ericsson can handle a reference at the end of the message which is used in
-	 * the confirm message. The confirm message is only sent if the trailer is present */
-	msgb_put_u8(msg, RSL_IE_ERIC_MOBILE_ID);
-	msgb_put_u32(msg, tlli);
+	/* Append ericsson propritary mobile identity field */
+	rsl_ericsson_put_mi(msg, tlli);
+
+	return abis_rsl_sendmsg(msg);
+}
+
+/* Chapter 8.5.6 (Ericcson vendor specific RSL extension) */
+int rsl_ericsson_imm_assign_via_pch_cmd(struct gsm_bts *bts, uint8_t len,
+					uint8_t *val, uint32_t tlli,
+					uint8_t pag_grp)
+{
+	struct msgb *msg = rsl_imm_assign_cmd_common(bts, len, val);
+
+	/* Append ericsson propritary paging group field */
+	msgb_put_u8(msg, 0x0e);
+	msgb_put_u8(msg, pag_grp);
+
+	/* Append ericsson propritary mobile identity field */
+	rsl_ericsson_put_mi(msg, tlli);
 
 	return abis_rsl_sendmsg(msg);
 }
diff --git a/src/libbsc/pcu_sock.c b/src/libbsc/pcu_sock.c
index 9f1c80c..88867af 100644
--- a/src/libbsc/pcu_sock.c
+++ b/src/libbsc/pcu_sock.c
@@ -325,9 +325,9 @@
 		mi_len = p1->data[0];
 		mi = p1->data+1;
 		LOGP(DPCU, LOGL_ERROR, "PCU Sends paging "
-		     "request type %02x (chan_needed=%02x, mi_len=%u, mi=%s)\n",
+		     "request type %02x (chan_needed=0x%02x, mi_len=%u, mi=%s, paging_group=0x%02x)\n",
 		     p1->msg_type, chan_needed, mi_len,
-		     osmo_hexdump_nospc(mi,mi_len));
+		     osmo_hexdump_nospc(mi,mi_len), paging_group);
 		/* NOTE: We will have to add 2 to mi_len and subtract 2 from
 		 * the mi pointer because rsl_paging_cmd() will perform the
 		 * reverse operations. This is because rsl_paging_cmd() is
@@ -389,6 +389,7 @@
 		msg->l3h = msgb_put(msg, data_req->len);
 		memcpy(msg->l3h, data_req->data, data_req->len);
 
+		LOGP(DPCU, LOGL_DEBUG, "PCU Sends immediate assignment via AGCH\n");
 		if (rsl_imm_assign_cmd(bts, msg->len, msg->data)) {
 			msgb_free(msg);
 			rc = -EIO;
@@ -404,18 +405,29 @@
 		}
 		tlli = *((uint32_t *)data_req->data);
 
-		msg = msgb_alloc(data_req->len - 4, "pcu_agch");
+		/* the first three bytes are the last three digits of
+		 * the IMSI, which we need to compute the paging group */
+		imsi_digit_buf[0] = data_req->data[4];
+		imsi_digit_buf[1] = data_req->data[5];
+		imsi_digit_buf[2] = data_req->data[6];
+		imsi_digit_buf[3] = '\0';
+		pag_grp = gsm0502_calc_paging_group(&bts->si_common.chan_desc,
+						str_to_imsi(imsi_digit_buf));
+
+		msg = msgb_alloc(data_req->len - 7, "pcu_pch");
 		if (!msg) {
 			rc = -ENOMEM;
 			break;
 		}
-		msg->l3h = msgb_put(msg, data_req->len - 4);
-		memcpy(msg->l3h, data_req->data + 4, data_req->len - 4);
+		msg->l3h = msgb_put(msg, data_req->len - 7);
+		memcpy(msg->l3h, data_req->data + 7, data_req->len - 7);
 
-		if (bts->type == GSM_BTS_TYPE_RBS2000)
-			rc = rsl_ericsson_imm_assign_cmd(bts, tlli, msg->len, msg->data);
-		else
-			rc = rsl_imm_assign_cmd(bts, msg->len, msg->data);
+		LOGP(DPCU, LOGL_DEBUG, "PCU Sends immediate assignment via PCH (tlli=0x%08x, pag_grp=0x%02x)\n",
+		     tlli, pag_grp);
+		if (bts->type == GSM_BTS_TYPE_RBS2000) {
+			rc = rsl_ericsson_imm_assign_via_pch_cmd(bts, msg->len, msg->data, tlli, pag_grp);
+		} else
+			LOGP(DPCU, LOGL_ERROR, "This BTS does not support immediate via PCH, dropping message!\n");
 
 		if (rc) {
 			msgb_free(msg);
@@ -423,8 +435,8 @@
 		}
 		break;
 	default:
-		LOGP(DPCU, LOGL_ERROR, "Received PCU data request with "
-			"unsupported sapi %d\n", data_req->sapi);
+		LOGP(DPCU, LOGL_ERROR, "Received PCU data request for "
+		     "unsupported channel (sapi=%d)\n", data_req->sapi);
 		rc = -EINVAL;
 	}
 

-- 
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Gerrit-MessageType: newchange
Gerrit-Change-Id: I0a899d9c866ed09dc301694dbbcad304b1ed49e5
Gerrit-PatchSet: 1
Gerrit-Project: osmo-bsc
Gerrit-Branch: master
Gerrit-Owner: lynxis lazus <lynxis at fe80.eu>
Gerrit-Reviewer: dexter <pmaier at sysmocom.de>



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