OML: Improve OML attribute handling

the OML attribute tables are hardcoded. To set variable parameters,
the hardcoded data structure (tlv) is patched on byte level during
runtime. This patch replaces this mechanism.

- Replace hardcoded OML attribute tables with dynamically
  generated TLV structures.

- Add unit tests to check if the OML attribute tables are
  generated correctly

- Put OML attribute table generator code in a separate file:
  bts_ipaccess_nanobts_omlattr.c

Change-Id: Ibeb34a84912d6cf695f553a34c69320fca7d08fa

1 files changed, 232 insertions, 0 deletions

diff --git a/openbsc/src/libbsc/bts_ipaccess_nanobts_omlattr.c b/openbsc/src/libbsc/bts_ipaccess_nanobts_omlattr.c
new file mode 100644
index 000000000..0291129d0
--- /dev/null
+++ b/openbsc/src/libbsc/bts_ipaccess_nanobts_omlattr.c
@@ -0,0 +1,232 @@
+/* ip.access nanoBTS specific code, OML attribute table generator */
+
+/* (C) 2016 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ * All Rights Reserved
+ *
+ * Author: Philipp Maier
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <arpa/inet.h>
+#include <osmocom/core/msgb.h>
+#include <openbsc/gsm_data.h>
+#include <openbsc/abis_nm.h>
+
+static void patch_16(uint8_t *data, const uint16_t val)
+{
+	memcpy(data, &val, sizeof(val));
+}
+
+static void patch_32(uint8_t *data, const uint32_t val)
+{
+	memcpy(data, &val, sizeof(val));
+}
+
+struct msgb *nanobts_attr_bts_get(struct gsm_bts *bts)
+{
+	struct msgb *msgb;
+	uint8_t buf[256];
+	msgb = msgb_alloc(1024, "nanobts_attr_bts");
+
+	memcpy(buf, "\x55\x5b\x61\x67\x6d\x73", 6);
+	msgb_tv_fixed_put(msgb, NM_ATT_INTERF_BOUND, 6, buf);
+
+	/* interference avg. period in numbers of SACCH multifr */
+	msgb_tv_put(msgb, NM_ATT_INTAVE_PARAM, 0x06);
+
+	/* conn fail based on SACCH error rate */
+	buf[0] = 0x01;
+	buf[1] = get_radio_link_timeout(&bts->si_common.cell_options);
+	msgb_tl16v_put(msgb, NM_ATT_CONN_FAIL_CRIT, 2, buf);
+
+	memcpy(buf, "\x1e\x24\x24\xa8\x34\x21\xa8", 7);
+	msgb_tv_fixed_put(msgb, NM_ATT_T200, 7, buf);
+
+	msgb_tv_put(msgb, NM_ATT_MAX_TA, 0x3f);
+
+	/* seconds */
+	memcpy(buf, "\x00\x01\x0a", 3);
+	msgb_tv_fixed_put(msgb, NM_ATT_OVERL_PERIOD, 3, buf);
+
+	/* percent */
+	msgb_tv_put(msgb, NM_ATT_CCCH_L_T, 10);
+
+	/* seconds */
+	msgb_tv_put(msgb, NM_ATT_CCCH_L_I_P, 1);
+
+	/* busy threshold in - dBm */
+	buf[0] = 10;
+	if (bts->rach_b_thresh != -1)
+		buf[0] = bts->rach_b_thresh & 0xff;
+	msgb_tv_put(msgb, NM_ATT_RACH_B_THRESH, buf[0]);
+
+	/* rach load averaging 1000 slots */
+	buf[0] = 0x03;
+	buf[1] = 0xe8;
+	if (bts->rach_ldavg_slots != -1) {
+		buf[0] = (bts->rach_ldavg_slots >> 8) & 0x0f;
+		buf[1] = bts->rach_ldavg_slots & 0xff;
+	}
+	msgb_tv_fixed_put(msgb, NM_ATT_LDAVG_SLOTS, 2, buf);
+
+	/* miliseconds */
+	msgb_tv_put(msgb, NM_ATT_BTS_AIR_TIMER, 128);
+
+	/* 10 retransmissions of physical config */
+	msgb_tv_put(msgb, NM_ATT_NY1, 10);
+
+	buf[0] = (bts->c0->arfcn >> 8) & 0x0f;
+	buf[1] = bts->c0->arfcn & 0xff;
+	msgb_tv_fixed_put(msgb, NM_ATT_BCCH_ARFCN, 2, buf);
+
+	msgb_tv_put(msgb, NM_ATT_BSIC, bts->bsic);
+
+	abis_nm_ipaccess_cgi(buf, bts);
+	msgb_tl16v_put(msgb, NM_ATT_IPACC_CGI, 7, buf);
+
+	return msgb;
+}
+
+struct msgb *nanobts_attr_nse_get(struct gsm_bts *bts)
+{
+	struct msgb *msgb;
+	uint8_t buf[256];
+	msgb = msgb_alloc(1024, "nanobts_attr_bts");
+
+	/* NSEI 925 */
+	buf[0] = bts->gprs.nse.nsei >> 8;
+	buf[1] = bts->gprs.nse.nsei & 0xff;
+	msgb_tl16v_put(msgb, NM_ATT_IPACC_NSEI, 2, buf);
+
+	/* all timers in seconds */
+	OSMO_ASSERT(ARRAY_SIZE(bts->gprs.nse.timer) < sizeof(buf));
+	memcpy(buf, bts->gprs.nse.timer, ARRAY_SIZE(bts->gprs.nse.timer));
+	msgb_tl16v_put(msgb, NM_ATT_IPACC_NS_CFG, 7, buf);
+
+	/* all timers in seconds */
+	buf[0] = 3;	/* blockimg timer (T1) */
+	buf[1] = 3;	/* blocking retries */
+	buf[2] = 3;	/* unblocking retries */
+	buf[3] = 3;	/* reset timer (T2) */
+	buf[4] = 3;	/* reset retries */
+	buf[5] = 10;	/* suspend timer (T3) in 100ms */
+	buf[6] = 3;	/* suspend retries */
+	buf[7] = 10;	/* resume timer (T4) in 100ms */
+	buf[8] = 3;	/* resume retries */
+	buf[9] = 10;	/* capability update timer (T5) */
+	buf[10] = 3;	/* capability update retries */
+
+	OSMO_ASSERT(ARRAY_SIZE(bts->gprs.cell.timer) < sizeof(buf));
+	memcpy(buf, bts->gprs.cell.timer, ARRAY_SIZE(bts->gprs.cell.timer));
+	msgb_tl16v_put(msgb, NM_ATT_IPACC_BSSGP_CFG, 11, buf);
+
+	return msgb;
+}
+
+struct msgb *nanobts_attr_cell_get(struct gsm_bts *bts)
+{
+	struct msgb *msgb;
+	uint8_t buf[256];
+	msgb = msgb_alloc(1024, "nanobts_attr_bts");
+
+	/* routing area code */
+	buf[0] = bts->gprs.rac;
+	msgb_tl16v_put(msgb, NM_ATT_IPACC_RAC, 1, buf);
+
+	buf[0] = 5;	/* repeat time (50ms) */
+	buf[1] = 3;	/* repeat count */
+	msgb_tl16v_put(msgb, NM_ATT_IPACC_GPRS_PAGING_CFG, 2, buf);
+
+	/* BVCI 925 */
+	buf[0] = bts->gprs.cell.bvci >> 8;
+	buf[1] = bts->gprs.cell.bvci & 0xff;
+	msgb_tl16v_put(msgb, NM_ATT_IPACC_BVCI, 2, buf);
+
+	/* all timers in seconds, unless otherwise stated */
+	buf[0] = 20;	/* T3142 */
+	buf[1] = 5;	/* T3169 */
+	buf[2] = 5;	/* T3191 */
+	buf[3] = 160;	/* T3193 (units of 10ms) */
+	buf[4] = 5;	/* T3195 */
+	buf[5] = 10;	/* N3101 */
+	buf[6] = 4;	/* N3103 */
+	buf[7] = 8;	/* N3105 */
+	buf[8] = 15;	/* RLC CV countdown */
+	msgb_tl16v_put(msgb, NM_ATT_IPACC_RLC_CFG, 9, buf);
+
+	if (bts->gprs.mode == BTS_GPRS_EGPRS) {
+		buf[0] = 0x8f;
+		buf[1] = 0xff;
+	} else {
+		buf[0] = 0x0f;
+		buf[1] = 0x00;
+	}
+	msgb_tl16v_put(msgb, NM_ATT_IPACC_CODING_SCHEMES, 2, buf);
+
+	buf[0] = 0;	/* T downlink TBF extension (0..500, high byte) */
+	buf[1] = 250;	/* T downlink TBF extension (0..500, low byte) */
+	buf[2] = 0;	/* T uplink TBF extension (0..500, high byte) */
+	buf[3] = 250;	/* T uplink TBF extension (0..500, low byte) */
+	buf[4] = 2;	/* CS2 */
+	msgb_tl16v_put(msgb, NM_ATT_IPACC_RLC_CFG_2, 5, buf);
+
+#if 0
+	/* EDGE model only, breaks older models.
+	 * Should inquire the BTS capabilities */
+	buf[0] = 2;		/* MCS2 */
+	msgb_tl16v_put(msgb, NM_ATT_IPACC_RLC_CFG_3, 1, buf);
+#endif
+
+	return msgb;
+}
+
+struct msgb *nanobts_attr_nscv_get(struct gsm_bts *bts)
+{
+	struct msgb *msgb;
+	uint8_t buf[256];
+	msgb = msgb_alloc(1024, "nanobts_attr_bts");
+
+	/* 925 */
+	buf[0] = bts->gprs.nsvc[0].nsvci >> 8;
+	buf[1] = bts->gprs.nsvc[0].nsvci & 0xff;
+	msgb_tl16v_put(msgb, NM_ATT_IPACC_NSVCI, 2, buf);
+
+	/* remote udp port */
+	patch_16(&buf[0], htons(bts->gprs.nsvc[0].remote_port));
+	/* remote ip address */
+	patch_32(&buf[2], htonl(bts->gprs.nsvc[0].remote_ip));
+	/* local udp port */
+	patch_16(&buf[6], htons(bts->gprs.nsvc[0].local_port));
+	msgb_tl16v_put(msgb, NM_ATT_IPACC_NS_LINK_CFG, 8, buf);
+
+	return msgb;
+}
+
+struct msgb *nanobts_attr_radio_get(struct gsm_bts *bts,
+				    struct gsm_bts_trx *trx)
+{
+	struct msgb *msgb;
+	uint8_t buf[256];
+	msgb = msgb_alloc(1024, "nanobts_attr_bts");
+
+	/* number of -2dB reduction steps / Pn */
+	msgb_tv_put(msgb, NM_ATT_RF_MAXPOWR_R, trx->max_power_red / 2);
+
+	buf[0] = trx->arfcn >> 8;
+	buf[1] = trx->arfcn & 0xff;
+	msgb_tl16v_put(msgb, NM_ATT_ARFCN_LIST, 2, buf);
+
+	return msgb;
+}