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gerrit.osmocom.org / libosmocore / 9a5bbf36b543ff89c0ed148428d97300880c5804 / . / src / gsm / gprs_rlc.c
blob: d6ccbbe4179863c441fccc5876e966d4f20bbfca [file] [log] [blame]
Tom Tsou9a5bbf32016-07-14 15:13:45 -0700[diff] [blame^]1#include <errno.h>
2#include <string.h>
3
4#include <osmocom/gprs/gprs_rlc.h>
5#include <osmocom/gprs/protocol/gsm_04_60.h>
6
7#define EGPRS_CPS_TYPE1_TBL_SZ 29
8#define EGPRS_CPS_TYPE2_TBL_SZ 8
9#define EGPRS_CPS_TYPE3_TBL_SZ 16
10
11/* 3GPP TS 44.060 10.4.8a.1.1 "Header type 1" */
12static const struct egprs_cps egprs_cps_table_type1[EGPRS_CPS_TYPE1_TBL_SZ] = {
13 { .bits = 0, .mcs = 9, .p = { EGPRS_CPS_P1, EGPRS_CPS_P1 } },
14 { .bits = 1, .mcs = 9, .p = { EGPRS_CPS_P1, EGPRS_CPS_P2 } },
15 { .bits = 2, .mcs = 9, .p = { EGPRS_CPS_P1, EGPRS_CPS_P3 } },
16 { .bits = 3, .mcs = 0, .p = { EGPRS_CPS_NONE, EGPRS_CPS_NONE } },
17 { .bits = 4, .mcs = 9, .p = { EGPRS_CPS_P2, EGPRS_CPS_P1 } },
18 { .bits = 5, .mcs = 9, .p = { EGPRS_CPS_P2, EGPRS_CPS_P2 } },
19 { .bits = 6, .mcs = 9, .p = { EGPRS_CPS_P2, EGPRS_CPS_P3 } },
20 { .bits = 7, .mcs = 0, .p = { EGPRS_CPS_NONE, EGPRS_CPS_NONE } },
21 { .bits = 8, .mcs = 9, .p = { EGPRS_CPS_P3, EGPRS_CPS_P1 } },
22 { .bits = 9, .mcs = 9, .p = { EGPRS_CPS_P3, EGPRS_CPS_P2 } },
23 { .bits = 10, .mcs = 9, .p = { EGPRS_CPS_P3, EGPRS_CPS_P3 } },
24 { .bits = 11, .mcs = 8, .p = { EGPRS_CPS_P1, EGPRS_CPS_P1 } },
25 { .bits = 12, .mcs = 8, .p = { EGPRS_CPS_P1, EGPRS_CPS_P2 } },
26 { .bits = 13, .mcs = 8, .p = { EGPRS_CPS_P1, EGPRS_CPS_P3 } },
27 { .bits = 14, .mcs = 8, .p = { EGPRS_CPS_P2, EGPRS_CPS_P1 } },
28 { .bits = 15, .mcs = 8, .p = { EGPRS_CPS_P2, EGPRS_CPS_P2 } },
29 { .bits = 16, .mcs = 8, .p = { EGPRS_CPS_P2, EGPRS_CPS_P3 } },
30 { .bits = 17, .mcs = 8, .p = { EGPRS_CPS_P3, EGPRS_CPS_P1 } },
31 { .bits = 18, .mcs = 8, .p = { EGPRS_CPS_P3, EGPRS_CPS_P2 } },
32 { .bits = 19, .mcs = 8, .p = { EGPRS_CPS_P3, EGPRS_CPS_P3 } },
33 { .bits = 20, .mcs = 7, .p = { EGPRS_CPS_P1, EGPRS_CPS_P1 } },
34 { .bits = 21, .mcs = 7, .p = { EGPRS_CPS_P1, EGPRS_CPS_P2 } },
35 { .bits = 22, .mcs = 7, .p = { EGPRS_CPS_P1, EGPRS_CPS_P3 } },
36 { .bits = 23, .mcs = 7, .p = { EGPRS_CPS_P2, EGPRS_CPS_P1 } },
37 { .bits = 24, .mcs = 7, .p = { EGPRS_CPS_P2, EGPRS_CPS_P2 } },
38 { .bits = 25, .mcs = 7, .p = { EGPRS_CPS_P2, EGPRS_CPS_P3 } },
39 { .bits = 26, .mcs = 7, .p = { EGPRS_CPS_P3, EGPRS_CPS_P1 } },
40 { .bits = 27, .mcs = 7, .p = { EGPRS_CPS_P3, EGPRS_CPS_P2 } },
41 { .bits = 28, .mcs = 7, .p = { EGPRS_CPS_P3, EGPRS_CPS_P3 } },
42};
43
44/*
45 * 3GPP TS 44.060 10.4.8a.2.1
46 * "Header type 2 in EGPRS TBF or uplink EGPRS2-A TBF"
47 */
48static const struct egprs_cps egprs_cps_table_type2[EGPRS_CPS_TYPE2_TBL_SZ] = {
49 { .bits = 0, .mcs = 6, .p = { EGPRS_CPS_P1, EGPRS_CPS_NONE } },
50 { .bits = 1, .mcs = 6, .p = { EGPRS_CPS_P2, EGPRS_CPS_NONE } },
51 { .bits = 2, .mcs = 6, .p = { EGPRS_CPS_P1, EGPRS_CPS_NONE } },
52 { .bits = 3, .mcs = 6, .p = { EGPRS_CPS_P2, EGPRS_CPS_NONE } },
53 { .bits = 4, .mcs = 5, .p = { EGPRS_CPS_P1, EGPRS_CPS_NONE } },
54 { .bits = 5, .mcs = 5, .p = { EGPRS_CPS_P2, EGPRS_CPS_NONE } },
55 { .bits = 6, .mcs = 6, .p = { EGPRS_CPS_P1, EGPRS_CPS_NONE } },
56 { .bits = 7, .mcs = 6, .p = { EGPRS_CPS_P2, EGPRS_CPS_NONE } },
57};
58
59/* 3GPP TS 44.060 10.4.8a.3 "Header type 3" */
60static const struct egprs_cps egprs_cps_table_type3[EGPRS_CPS_TYPE3_TBL_SZ] = {
61 { .bits = 0, .mcs = 4, .p = { EGPRS_CPS_P1, EGPRS_CPS_NONE } },
62 { .bits = 1, .mcs = 4, .p = { EGPRS_CPS_P2, EGPRS_CPS_NONE } },
63 { .bits = 2, .mcs = 4, .p = { EGPRS_CPS_P3, EGPRS_CPS_NONE } },
64 { .bits = 3, .mcs = 3, .p = { EGPRS_CPS_P1, EGPRS_CPS_NONE } },
65 { .bits = 4, .mcs = 3, .p = { EGPRS_CPS_P2, EGPRS_CPS_NONE } },
66 { .bits = 5, .mcs = 3, .p = { EGPRS_CPS_P3, EGPRS_CPS_NONE } },
67 { .bits = 6, .mcs = 3, .p = { EGPRS_CPS_P1, EGPRS_CPS_NONE } },
68 { .bits = 7, .mcs = 3, .p = { EGPRS_CPS_P2, EGPRS_CPS_NONE } },
69 { .bits = 8, .mcs = 3, .p = { EGPRS_CPS_P3, EGPRS_CPS_NONE } },
70 { .bits = 9, .mcs = 2, .p = { EGPRS_CPS_P1, EGPRS_CPS_NONE } },
71 { .bits = 10, .mcs = 2, .p = { EGPRS_CPS_P2, EGPRS_CPS_NONE } },
72 { .bits = 11, .mcs = 1, .p = { EGPRS_CPS_P1, EGPRS_CPS_NONE } },
73 { .bits = 12, .mcs = 1, .p = { EGPRS_CPS_P2, EGPRS_CPS_NONE } },
74 { .bits = 13, .mcs = 2, .p = { EGPRS_CPS_P1, EGPRS_CPS_NONE } },
75 { .bits = 14, .mcs = 2, .p = { EGPRS_CPS_P2, EGPRS_CPS_NONE } },
76 { .bits = 15, .mcs = 0, .p = { EGPRS_CPS_NONE, EGPRS_CPS_NONE } },
77};
78
79int egprs_get_cps(struct egprs_cps *cps, uint8_t type, uint8_t bits)
80{
81 const struct egprs_cps *table_cps;
82
83 switch (type) {
84 case EGPRS_HDR_TYPE1:
85 if (bits >= EGPRS_CPS_TYPE1_TBL_SZ)
86 return -EINVAL;
87 table_cps = &egprs_cps_table_type1[bits];
88 break;
89 case EGPRS_HDR_TYPE2:
90 if (bits >= EGPRS_CPS_TYPE2_TBL_SZ)
91 return -EINVAL;
92 table_cps = &egprs_cps_table_type2[bits];
93 break;
94 case EGPRS_HDR_TYPE3:
95 if (bits >= EGPRS_CPS_TYPE3_TBL_SZ)
96 return -EINVAL;
97 table_cps = &egprs_cps_table_type3[bits];
98 break;
99 default:
100 return -EINVAL;
101 }
102
103 memcpy(cps, table_cps, sizeof *cps);
104
105 return 0;
106}