Change in osmo-pcu[master]: Fix Channel Coding Command for MCS

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Max gerrit-no-reply at lists.osmocom.org
Tue Mar 12 14:53:09 UTC 2019 

Max has uploaded this change for review. ( https://gerrit.osmocom.org/13216


Change subject: Fix Channel Coding Command for MCS
......................................................................

Fix Channel Coding Command for MCS

Previously result of ".to_num() - 1" was used without any checks which
means that in case of to_num() returning zero we would effectively try
to encode (uint8_t)(-1).

Let's fix this by using proper mcs_chan_code() function which returns
Channel Coding Command for MCS without the need to further correct it
and adjust expected tests output accordingly.

Change-Id: I868062a81fffe6714a811c032215f25a79259905
---
M src/encoding.cpp
M tests/types/TypesTest.cpp
M tests/types/TypesTest.ok
3 files changed, 10 insertions(+), 10 deletions(-)



  git pull ssh://gerrit.osmocom.org:29418/osmo-pcu refs/changes/16/13216/1

diff --git a/src/encoding.cpp b/src/encoding.cpp
index c2502b6..b7bc3cb 100644
--- a/src/encoding.cpp
+++ b/src/encoding.cpp
@@ -268,7 +268,7 @@
 	bitvec_write_field(dest, &wp, usf, 3);    // USF
 	bitvec_write_field(dest, &wp, 0, 1);    // USF_GRANULARITY
 	bitvec_write_field(dest, &wp, 0, 1);   // "0" power control: Not Present
-	bitvec_write_field(dest, &wp, tbf->current_cs().to_num() - 1, 2);    // CHANNEL_CODING_COMMAND
+	bitvec_write_field(dest, &wp, mcs_chan_code(tbf->current_cs()), 2);    // CHANNEL_CODING_COMMAND
 	bitvec_write_field(dest, &wp, 1, 1);    // TLLI_BLOCK_CHANNEL_CODING
 	if (alpha) {
 		bitvec_write_field(dest, &wp, 0x1, 1);   // ALPHA = present
@@ -315,7 +315,7 @@
 	CHECK(rc);
 
 	/* 3GPP TS 44.060 §12.10d EGPRS Modulation and coding Scheme description: */
-	rc = bitvec_set_u64(dest, tbf->current_cs().to_num() - 1, 4, false); /* EGPRS CHANNEL_CODING_COMMAND */
+	rc = bitvec_set_u64(dest, mcs_chan_code(tbf->current_cs()), 4, false); /* EGPRS CHANNEL_CODING_COMMAND */
 	CHECK(rc);
 
 	/* TLLI_BLOCK_CHANNEL_CODING */
@@ -571,7 +571,7 @@
 
 	if (!use_egprs) {
 		bitvec_write_field(dest, &wp,0x0,1); // Message escape
-		bitvec_write_field(dest, &wp,tbf->current_cs().to_num()-1, 2); // CHANNEL_CODING_COMMAND
+		bitvec_write_field(dest, &wp, mcs_chan_code(tbf->current_cs()), 2); // CHANNEL_CODING_COMMAND
 		bitvec_write_field(dest, &wp,0x1,1); // TLLI_BLOCK_CHANNEL_CODING
 		write_ta_ie(dest, wp,tbf->ta(), ta_idx, ta_ts);
 	} else { /* EPGRS */
@@ -579,7 +579,7 @@
 		bitvec_write_field(dest, &wp,0x0,2); // EGPRS message contents
 		bitvec_write_field(dest, &wp,0x0,1); // No CONTENTION_RESOLUTION_TLLI
 		bitvec_write_field(dest, &wp,0x0,1); // No COMPACT reduced MA
-		bitvec_write_field(dest, &wp,tbf->current_cs().to_num()-1, 4); // EGPRS Modulation and Coding IE
+		bitvec_write_field(dest, &wp, mcs_chan_code(tbf->current_cs()), 4); // EGPRS Modulation and Coding IE
 		/* 0: no RESEGMENT, 1: Segmentation*/
 		bitvec_write_field(dest, &wp, 0x1, 1);
 		write_ws(dest, &wp, tbf->window_size()); // EGPRS Window Size
@@ -809,7 +809,7 @@
 	struct gprs_rlcmac_ul_tbf *tbf, bool is_final)
 {
 
-	bitvec_write_field(dest, &wp, tbf->current_cs().to_num() - 1, 2); // CHANNEL_CODING_COMMAND
+	bitvec_write_field(dest, &wp, mcs_chan_code(tbf->current_cs()), 2); // CHANNEL_CODING_COMMAND
 	write_packet_ack_nack_desc_gprs(bts, dest, wp, tbf->window(), is_final);
 
 	bitvec_write_field(dest, &wp, 1, 1); // 1: have CONTENTION_RESOLUTION_TLLI
@@ -991,7 +991,7 @@
 	bitvec_write_field(dest, &wp, 0, 2); // fixed 00
 	/* CHANNEL_CODING_COMMAND */
 	bitvec_write_field(dest, &wp,
-		tbf->current_cs().to_num() - 1, 4);
+		mcs_chan_code(tbf->current_cs()), 4);
 	/* 0: no RESEGMENT, 1: Segmentation*/
 	bitvec_write_field(dest, &wp, 1, 1);
 	bitvec_write_field(dest, &wp, 1, 1); // PRE_EMPTIVE_TRANSMISSION, TODO: This resembles GPRS, change it?
diff --git a/tests/types/TypesTest.cpp b/tests/types/TypesTest.cpp
index 9c24ffe..4879424 100644
--- a/tests/types/TypesTest.cpp
+++ b/tests/types/TypesTest.cpp
@@ -497,7 +497,7 @@
 				 0x23, /* TA */
 				 0x00, /* 0-length §10.5.2.21 Mobile Allocation */
 				 /* ETSI TS 44.018 §10.5.2.16 IA Rest Octets */
-				 0xc8, 0x02, 0x7b, 0xa0, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, };
+				 0xc8, 0x02, 0x1b, 0xa0, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, };
 
 	check_imm_ass(tbf, false, GSM_L1_BURST_TYPE_ACCESS_0, res, sizeof(res), "ia_rest_uplink(MBA)");
 }
@@ -537,7 +537,7 @@
 				 0x23, /* TA */
 				 0x00, /* 0-length §10.5.2.21 Mobile Allocation */
 				 /* ETSI TS 44.018 §10.5.2.16 IA Rest Octets */
-				 0x46, 0xa0, 0x09, 0xe0, 0x17, 0x40, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, };
+				 0x46, 0xa0, 0x08, 0x00, 0x17, 0x40, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, };
 
 	check_imm_ass(tbf, false, GSM_L1_BURST_TYPE_ACCESS_1, res, sizeof(res), "ia_rest_egprs_uplink(SBA)");
 }
diff --git a/tests/types/TypesTest.ok b/tests/types/TypesTest.ok
index d4cc255..dd7dc4c 100644
--- a/tests/types/TypesTest.ok
+++ b/tests/types/TypesTest.ok
@@ -9,13 +9,13 @@
 [11] DL Immediate Assignment <ia_rest_downlink>:
 	06 3f 30 0d 23 6d 7f 03 18 23 00 d0 00 00 00 08 17 47 08 0b 5b 2b 2b 
 [11] UL Immediate Assignment <ia_rest_uplink(MBA)>:
-	06 3f 10 0d 23 6d 0d 03 18 23 00 c8 02 7b a0 2b 2b 2b 2b 2b 2b 2b 2b 
+	06 3f 10 0d 23 6d 0d 03 18 23 00 c8 02 1b a0 2b 2b 2b 2b 2b 2b 2b 2b 
 [11] UL Immediate Assignment <ia_rest_uplink(SBA)>:
 	06 3f 10 0d 23 6d 0d 03 18 23 00 c5 d1 08 0b 5b 2b 2b 2b 2b 2b 2b 2b 
 [11] UL Immediate Assignment <ia_rest_egprs_uplink(MBA)>:
 	06 3f 10 0d 23 6d 7f 03 18 23 00 46 97 40 0b 58 2b 2b 2b 2b 2b 2b 2b 
 [11] UL Immediate Assignment <ia_rest_egprs_uplink(SBA)>:
-	06 3f 10 0d 23 6d 7f 03 18 23 00 46 a0 09 e0 17 40 2b 2b 2b 2b 2b 2b 
+	06 3f 10 0d 23 6d 7f 03 18 23 00 46 a0 08 00 17 40 2b 2b 2b 2b 2b 2b 
 assignment reject: 06 3a 10 7f 06 36 14 7f 06 36 14 7f 06 36 14 7f 06 36 14 c0 2b 2b 
 assignment reject: 06 3a 10 70 06 36 14 70 06 36 14 70 06 36 14 70 06 36 14 0b 2b 2b 
 Testing LBS utility...

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Gerrit-Project: osmo-pcu
Gerrit-Branch: master
Gerrit-MessageType: newchange
Gerrit-Change-Id: I868062a81fffe6714a811c032215f25a79259905
Gerrit-Change-Number: 13216
Gerrit-PatchSet: 1
Gerrit-Owner: Max <msuraev at sysmocom.de>
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