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/*! \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 <laforge@gnumonks.org>
* All Rights Reserved.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <errno.h>
#include <string.h>
#include <osmocom/core/utils.h>
#include <osmocom/gprs/gprs_rlc.h>
#include <osmocom/coding/gsm0503_coding.h>
#include <osmocom/gprs/protocol/gsm_04_60.h>
#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;
}
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