/*! \file gsm/gprs_rlc.c * helper functions for (E)GPRS RLC according to 3GPP TS 44.060. * * (C) 2016 by Thomas Thou * (C) 2016-2017 by sysmocom - s.f.m.c. GmbH * (C) 2017 by Harald Welte * All Rights Reserved. * * SPDX-License-Identifier: GPL-2.0+ */ #include #include #include #include #include #include #define EGPRS_CPS_TYPE1_TBL_SZ 29 #define EGPRS_CPS_TYPE2_TBL_SZ 8 #define EGPRS_CPS_TYPE3_TBL_SZ 16 /* 3GPP TS 44.060 10.4.8a.1.1 "Header type 1" */ static const struct egprs_cps egprs_cps_table_type1[EGPRS_CPS_TYPE1_TBL_SZ] = { { .bits = 0, .mcs = EGPRS_MCS9, .p = { EGPRS_CPS_P1, EGPRS_CPS_P1 } }, { .bits = 1, .mcs = EGPRS_MCS9, .p = { EGPRS_CPS_P1, EGPRS_CPS_P2 } }, { .bits = 2, .mcs = EGPRS_MCS9, .p = { EGPRS_CPS_P1, EGPRS_CPS_P3 } }, { .bits = 3, .mcs = EGPRS_NUM_MCS, .p = { EGPRS_CPS_NONE, EGPRS_CPS_NONE } }, /* reserved for future use */ { .bits = 4, .mcs = EGPRS_MCS9, .p = { EGPRS_CPS_P2, EGPRS_CPS_P1 } }, { .bits = 5, .mcs = EGPRS_MCS9, .p = { EGPRS_CPS_P2, EGPRS_CPS_P2 } }, { .bits = 6, .mcs = EGPRS_MCS9, .p = { EGPRS_CPS_P2, EGPRS_CPS_P3 } }, { .bits = 7, .mcs = EGPRS_NUM_MCS, .p = { EGPRS_CPS_NONE, EGPRS_CPS_NONE } }, /* reserved for future use */ { .bits = 8, .mcs = EGPRS_MCS9, .p = { EGPRS_CPS_P3, EGPRS_CPS_P1 } }, { .bits = 9, .mcs = EGPRS_MCS9, .p = { EGPRS_CPS_P3, EGPRS_CPS_P2 } }, { .bits = 10, .mcs = EGPRS_MCS9, .p = { EGPRS_CPS_P3, EGPRS_CPS_P3 } }, { .bits = 11, .mcs = EGPRS_MCS8, .p = { EGPRS_CPS_P1, EGPRS_CPS_P1 } }, { .bits = 12, .mcs = EGPRS_MCS8, .p = { EGPRS_CPS_P1, EGPRS_CPS_P2 } }, { .bits = 13, .mcs = EGPRS_MCS8, .p = { EGPRS_CPS_P1, EGPRS_CPS_P3 } }, { .bits = 14, .mcs = EGPRS_MCS8, .p = { EGPRS_CPS_P2, EGPRS_CPS_P1 } }, { .bits = 15, .mcs = EGPRS_MCS8, .p = { EGPRS_CPS_P2, EGPRS_CPS_P2 } }, { .bits = 16, .mcs = EGPRS_MCS8, .p = { EGPRS_CPS_P2, EGPRS_CPS_P3 } }, { .bits = 17, .mcs = EGPRS_MCS8, .p = { EGPRS_CPS_P3, EGPRS_CPS_P1 } }, { .bits = 18, .mcs = EGPRS_MCS8, .p = { EGPRS_CPS_P3, EGPRS_CPS_P2 } }, { .bits = 19, .mcs = EGPRS_MCS8, .p = { EGPRS_CPS_P3, EGPRS_CPS_P3 } }, { .bits = 20, .mcs = EGPRS_MCS7, .p = { EGPRS_CPS_P1, EGPRS_CPS_P1 } }, { .bits = 21, .mcs = EGPRS_MCS7, .p = { EGPRS_CPS_P1, EGPRS_CPS_P2 } }, { .bits = 22, .mcs = EGPRS_MCS7, .p = { EGPRS_CPS_P1, EGPRS_CPS_P3 } }, { .bits = 23, .mcs = EGPRS_MCS7, .p = { EGPRS_CPS_P2, EGPRS_CPS_P1 } }, { .bits = 24, .mcs = EGPRS_MCS7, .p = { EGPRS_CPS_P2, EGPRS_CPS_P2 } }, { .bits = 25, .mcs = EGPRS_MCS7, .p = { EGPRS_CPS_P2, EGPRS_CPS_P3 } }, { .bits = 26, .mcs = EGPRS_MCS7, .p = { EGPRS_CPS_P3, EGPRS_CPS_P1 } }, { .bits = 27, .mcs = EGPRS_MCS7, .p = { EGPRS_CPS_P3, EGPRS_CPS_P2 } }, { .bits = 28, .mcs = EGPRS_MCS7, .p = { EGPRS_CPS_P3, EGPRS_CPS_P3 } }, }; /* * 3GPP TS 44.060 10.4.8a.2.1 * "Header type 2 in EGPRS TBF or uplink EGPRS2-A TBF" */ static const struct egprs_cps egprs_cps_table_type2[EGPRS_CPS_TYPE2_TBL_SZ] = { { .bits = 0, .mcs = EGPRS_MCS6, .p = { EGPRS_CPS_P1, EGPRS_CPS_NONE } }, { .bits = 1, .mcs = EGPRS_MCS6, .p = { EGPRS_CPS_P2, EGPRS_CPS_NONE } }, { .bits = 2, .mcs = EGPRS_MCS6, .p = { EGPRS_CPS_P1, EGPRS_CPS_NONE } }, { .bits = 3, .mcs = EGPRS_MCS6, .p = { EGPRS_CPS_P2, EGPRS_CPS_NONE } }, { .bits = 4, .mcs = EGPRS_MCS5, .p = { EGPRS_CPS_P1, EGPRS_CPS_NONE } }, { .bits = 5, .mcs = EGPRS_MCS5, .p = { EGPRS_CPS_P2, EGPRS_CPS_NONE } }, { .bits = 6, .mcs = EGPRS_MCS6, .p = { EGPRS_CPS_P1, EGPRS_CPS_NONE } }, { .bits = 7, .mcs = EGPRS_MCS6, .p = { EGPRS_CPS_P2, EGPRS_CPS_NONE } }, }; /* 3GPP TS 44.060 10.4.8a.3 "Header type 3" */ static const struct egprs_cps egprs_cps_table_type3[EGPRS_CPS_TYPE3_TBL_SZ] = { { .bits = 0, .mcs = EGPRS_MCS4, .p = { EGPRS_CPS_P1, EGPRS_CPS_NONE } }, { .bits = 1, .mcs = EGPRS_MCS4, .p = { EGPRS_CPS_P2, EGPRS_CPS_NONE } }, { .bits = 2, .mcs = EGPRS_MCS4, .p = { EGPRS_CPS_P3, EGPRS_CPS_NONE } }, { .bits = 3, .mcs = EGPRS_MCS3, .p = { EGPRS_CPS_P1, EGPRS_CPS_NONE } }, { .bits = 4, .mcs = EGPRS_MCS3, .p = { EGPRS_CPS_P2, EGPRS_CPS_NONE } }, { .bits = 5, .mcs = EGPRS_MCS3, .p = { EGPRS_CPS_P3, EGPRS_CPS_NONE } }, { .bits = 6, .mcs = EGPRS_MCS3, .p = { EGPRS_CPS_P1, EGPRS_CPS_NONE } }, { .bits = 7, .mcs = EGPRS_MCS3, .p = { EGPRS_CPS_P2, EGPRS_CPS_NONE } }, { .bits = 8, .mcs = EGPRS_MCS3, .p = { EGPRS_CPS_P3, EGPRS_CPS_NONE } }, { .bits = 9, .mcs = EGPRS_MCS2, .p = { EGPRS_CPS_P1, EGPRS_CPS_NONE } }, { .bits = 10, .mcs = EGPRS_MCS2, .p = { EGPRS_CPS_P2, EGPRS_CPS_NONE } }, { .bits = 11, .mcs = EGPRS_MCS1, .p = { EGPRS_CPS_P1, EGPRS_CPS_NONE } }, { .bits = 12, .mcs = EGPRS_MCS1, .p = { EGPRS_CPS_P2, EGPRS_CPS_NONE } }, { .bits = 13, .mcs = EGPRS_MCS2, .p = { EGPRS_CPS_P1, EGPRS_CPS_NONE } }, { .bits = 14, .mcs = EGPRS_MCS2, .p = { EGPRS_CPS_P2, EGPRS_CPS_NONE } }, { .bits = 15, .mcs = EGPRS_MCS0, .p = { EGPRS_CPS_NONE, EGPRS_CPS_NONE } }, }; int egprs_get_cps(struct egprs_cps *cps, uint8_t type, uint8_t bits) { const struct egprs_cps *table_cps; switch (type) { case EGPRS_HDR_TYPE1: if (bits >= EGPRS_CPS_TYPE1_TBL_SZ) return -EINVAL; table_cps = &egprs_cps_table_type1[bits]; break; case EGPRS_HDR_TYPE2: if (bits >= EGPRS_CPS_TYPE2_TBL_SZ) return -EINVAL; table_cps = &egprs_cps_table_type2[bits]; break; case EGPRS_HDR_TYPE3: if (bits >= EGPRS_CPS_TYPE3_TBL_SZ) return -EINVAL; table_cps = &egprs_cps_table_type3[bits]; break; default: return -EINVAL; } memcpy(cps, table_cps, sizeof *cps); return 0; } struct gprs_cs_desc { struct { uint8_t bytes; uint8_t bits; } uplink, downlink; }; const struct gprs_cs_desc gprs_cs_desc[_NUM_OSMO_GPRS_CS] = { [OSMO_GPRS_CS1] = { {23, 0}, {23, 0} }, [OSMO_GPRS_CS2] = { {33, 7}, {33, 7} }, [OSMO_GPRS_CS3] = { {39, 3}, {39, 3} }, [OSMO_GPRS_CS4] = { {53, 7}, {53, 7} }, [OSMO_GPRS_MCS1] = { {26, 1}, {26, 1} }, [OSMO_GPRS_MCS2] = { {32, 1}, {32, 1} }, [OSMO_GPRS_MCS3] = { {41, 1}, {41, 1} }, [OSMO_GPRS_MCS4] = { {48, 1}, {48, 1} }, [OSMO_GPRS_MCS5] = { {60, 7}, {59, 6} }, [OSMO_GPRS_MCS6] = { {78, 7}, {77, 6} }, [OSMO_GPRS_MCS7] = { {118, 2}, {117, 4} }, [OSMO_GPRS_MCS8] = { {142, 2}, {141, 4} }, [OSMO_GPRS_MCS9] = { {154, 2}, {153, 4} }, }; /*! Return size of (E)GPRS uplink block for given coding scheme in bits */ int osmo_gprs_ul_block_size_bits(enum osmo_gprs_cs cs) { if (cs >= ARRAY_SIZE(gprs_cs_desc)) return -EINVAL; return gprs_cs_desc[cs].uplink.bytes * 8 + gprs_cs_desc[cs].uplink.bits; } /*! Return size of (E)GPRS downlink block for given coding scheme in bits */ int osmo_gprs_dl_block_size_bits(enum osmo_gprs_cs cs) { if (cs >= ARRAY_SIZE(gprs_cs_desc)) return -EINVAL; return gprs_cs_desc[cs].downlink.bytes * 8 + gprs_cs_desc[cs].downlink.bits; } /*! Return size of (E)GPRS uplink block for given coding scheme in bytes */ int osmo_gprs_ul_block_size_bytes(enum osmo_gprs_cs cs) { int rc; if (cs >= ARRAY_SIZE(gprs_cs_desc)) return -EINVAL; rc = gprs_cs_desc[cs].uplink.bytes; if (gprs_cs_desc[cs].uplink.bits) rc++; return rc; } /*! Return size of (E)GPRS downlink block for given coding scheme in bytes */ int osmo_gprs_dl_block_size_bytes(enum osmo_gprs_cs cs) { int rc; if (cs >= ARRAY_SIZE(gprs_cs_desc)) return -EINVAL; rc = gprs_cs_desc[cs].downlink.bytes; if (gprs_cs_desc[cs].downlink.bits) rc++; return rc; } /*! Return coding scheme for given (E)GPRS uplink block size */ enum osmo_gprs_cs osmo_gprs_ul_cs_by_block_bytes(uint8_t block_size) { unsigned int i; for (i = 0; i < ARRAY_SIZE(gprs_cs_desc); i++) { if (block_size == osmo_gprs_ul_block_size_bytes(i)) return i; } return OSMO_GPRS_CS_NONE; } /*! Return coding scheme for given (E)GPRS downlink block size */ enum osmo_gprs_cs osmo_gprs_dl_cs_by_block_bytes(uint8_t block_size) { unsigned int i; for (i = 0; i < ARRAY_SIZE(gprs_cs_desc); i++) { if (block_size == osmo_gprs_dl_block_size_bytes(i)) return i; } return OSMO_GPRS_CS_NONE; }