440 lines
15 KiB
C
440 lines
15 KiB
C
/* GPRS RLCMAC as per 3GPP TS 44.060 */
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/*
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* (C) 2023 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <stdbool.h>
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#include <osmocom/gsm/rsl.h>
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#include <osmocom/gprs/rlcmac/rlcmac.h>
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#include <osmocom/gprs/rlcmac/rlcmac_prim.h>
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#include <osmocom/gprs/rlcmac/rlcmac_private.h>
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#include <osmocom/gprs/rlcmac/rlcmac_dec.h>
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#include <osmocom/gprs/rlcmac/pdch_ul_controller.h>
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#include <osmocom/gprs/rlcmac/tbf_ul_fsm.h>
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#include <osmocom/gprs/rlcmac/tbf_ul_ass_fsm.h>
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#include <osmocom/gprs/rlcmac/gre.h>
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#include <osmocom/gprs/rlcmac/tbf_dl.h>
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#include <osmocom/gprs/rlcmac/tbf_ul.h>
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#include <osmocom/gprs/rlcmac/csn1_defs.h>
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#include <osmocom/gprs/rlcmac/rlc.h>
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#include <osmocom/gprs/rlcmac/types_private.h>
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#include <osmocom/gprs/rlcmac/rlc_window.h>
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#define GPRS_CODEL_SLOW_INTERVAL_MS 4000
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struct gprs_rlcmac_ctx *g_ctx;
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/* TS 44.060 Table 13.1.1 */
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static struct osmo_tdef T_defs_rlcmac[] = {
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{ .T=3164, .default_val=5, .desc="Wait for Uplink State Flag After Assignment (s)" },
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{ .T=3166, .default_val=5, .desc="Wait for Packet Uplink ACK/NACK after sending of first data block (s)" },
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{ 0 } /* empty item at the end */
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};
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static void gprs_rlcmac_ctx_free(void)
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{
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struct gprs_rlcmac_entity *gre;
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while ((gre = llist_first_entry_or_null(&g_ctx->gre_list, struct gprs_rlcmac_entity, entry)))
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gprs_rlcmac_entity_free(gre);
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talloc_free(g_ctx);
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}
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int osmo_gprs_rlcmac_init(enum osmo_gprs_rlcmac_location location)
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{
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bool first_init = true;
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int rc;
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unsigned int i;
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OSMO_ASSERT(location == OSMO_GPRS_RLCMAC_LOCATION_MS || location == OSMO_GPRS_RLCMAC_LOCATION_PCU)
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if (g_ctx) {
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gprs_rlcmac_ctx_free();
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first_init = false;
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}
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g_ctx = talloc_zero(NULL, struct gprs_rlcmac_ctx);
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g_ctx->cfg.location = location;
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g_ctx->cfg.codel.use = true;
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g_ctx->cfg.codel.interval_msec = GPRS_CODEL_SLOW_INTERVAL_MS;
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g_ctx->cfg.egprs_arq_type = GPRS_RLCMAC_EGPRS_ARQ1;
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g_ctx->cfg.ul_tbf_preemptive_retransmission = true;
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g_ctx->T_defs = T_defs_rlcmac;
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INIT_LLIST_HEAD(&g_ctx->gre_list);
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osmo_tdefs_reset(g_ctx->T_defs);
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if (first_init) {
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rc = gprs_rlcmac_tbf_dl_fsm_init();
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if (rc != 0) {
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TALLOC_FREE(g_ctx);
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return rc;
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}
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rc = gprs_rlcmac_tbf_ul_fsm_init();
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if (rc != 0) {
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TALLOC_FREE(g_ctx);
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return rc;
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}
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rc = gprs_rlcmac_tbf_ul_ass_fsm_init();
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if (rc != 0) {
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TALLOC_FREE(g_ctx);
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return rc;
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}
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}
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for (i = 0; i < ARRAY_SIZE(g_ctx->sched.ulc); i++) {
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g_ctx->sched.ulc[i] = gprs_rlcmac_pdch_ulc_alloc(g_ctx, i);
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OSMO_ASSERT(g_ctx->sched.ulc[i]);
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}
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return 0;
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}
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/*! Set CoDel parameters used in the Tx queue of LLC PDUs waiting to be transmitted.
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* \param[in] use Whether to enable or disable use of CoDel algo.
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* \param[in] interval_msec Interval at which CoDel triggers, in milliseconds. (0 = use default interval value)
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* \returns 0 on success; negative on error.
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*/
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int osmo_gprs_rlcmac_set_codel_params(bool use, unsigned int interval_msec)
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{
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if (interval_msec == 0)
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interval_msec = GPRS_CODEL_SLOW_INTERVAL_MS;
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g_ctx->cfg.codel.use = use;
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g_ctx->cfg.codel.interval_msec = interval_msec;
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return 0;
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}
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struct gprs_rlcmac_entity *gprs_rlcmac_find_entity_by_tlli(uint32_t tlli)
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{
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struct gprs_rlcmac_entity *gre;
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llist_for_each_entry(gre, &g_ctx->gre_list, entry) {
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if (gre->tlli == tlli)
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return gre;
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}
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return NULL;
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}
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struct gprs_rlcmac_dl_tbf *gprs_rlcmac_find_dl_tbf_by_tfi(uint8_t dl_tfi)
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{
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struct gprs_rlcmac_entity *gre;
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llist_for_each_entry(gre, &g_ctx->gre_list, entry) {
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if (!gre->dl_tbf)
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continue;
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if (gre->dl_tbf->cur_alloc.dl_tfi != dl_tfi)
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continue;
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return gre->dl_tbf;
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}
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return NULL;
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}
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struct gprs_rlcmac_ul_tbf *gprs_rlcmac_find_ul_tbf_by_tfi(uint8_t ul_tfi)
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{
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struct gprs_rlcmac_entity *gre;
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llist_for_each_entry(gre, &g_ctx->gre_list, entry) {
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if (!gre->ul_tbf)
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continue;
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if (gre->ul_tbf->cur_alloc.ul_tfi != ul_tfi)
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continue;
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return gre->ul_tbf;
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}
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return NULL;
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}
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static int gprs_rlcmac_handle_ccch_imm_ass_ul_tbf(uint8_t ts_nr, const struct gsm48_imm_ass *ia, const IA_RestOctets_t *iaro)
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{
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int rc = -ENOENT;
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struct gprs_rlcmac_entity *gre;
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struct gprs_rlcmac_ul_tbf *ul_tbf;
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struct tbf_ul_ass_ev_rx_ccch_imm_ass_ctx d = {
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.ts_nr = ts_nr,
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.ia = ia,
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.iaro = iaro
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};
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llist_for_each_entry(gre, &g_ctx->gre_list, entry) {
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ul_tbf = gre->ul_tbf;
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if (!ul_tbf)
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continue;
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if (!gprs_rlcmac_tbf_ul_ass_match_rach_req(ul_tbf, ia->req_ref.ra))
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continue;
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rc = osmo_fsm_inst_dispatch(ul_tbf->ul_ass_fsm.fi,
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GPRS_RLCMAC_TBF_UL_ASS_EV_RX_CCCH_IMM_ASS,
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&d);
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break;
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}
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return rc;
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}
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static int gprs_rlcmac_handle_ccch_imm_ass_dl_tbf(uint8_t ts_nr, const struct gsm48_imm_ass *ia, const IA_RestOctets_t *iaro)
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{
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int rc;
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struct gprs_rlcmac_entity *gre;
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struct gprs_rlcmac_dl_tbf *dl_tbf;
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const Packet_Downlink_ImmAssignment_t *pkdlass;
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if (iaro->UnionType == 1) {
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/* TODO */
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return -ENOENT;
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}
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pkdlass = &iaro->u.hh.u.UplinkDownlinkAssignment.ul_dl.Packet_Downlink_ImmAssignment;
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gre = gprs_rlcmac_find_entity_by_tlli(pkdlass->TLLI);
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if (!gre) {
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LOGRLCMAC(LOGL_NOTICE, "Got IMM_ASS (DL_TBF) for unknown TLLI=0x%08x\n", pkdlass->TLLI);
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return -ENOENT;
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}
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LOGGRE(gre, LOGL_INFO, "Got PCH IMM_ASS (DL_TBF): DL_TFI=%u TS=%u\n",
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pkdlass->TFI_ASSIGNMENT, ts_nr);
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dl_tbf = gprs_rlcmac_dl_tbf_alloc(gre);
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dl_tbf->cur_alloc.dl_tfi = pkdlass->TFI_ASSIGNMENT;
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dl_tbf->cur_alloc.ts[ts_nr].allocated = true;
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/* replace old DL TBF with new one: */
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gprs_rlcmac_dl_tbf_free(gre->dl_tbf);
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gre->dl_tbf = dl_tbf;
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rc = osmo_fsm_inst_dispatch(dl_tbf->state_fsm.fi, GPRS_RLCMAC_TBF_UL_EV_DL_ASS_COMPL, NULL);
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return rc;
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}
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int gprs_rlcmac_handle_ccch_imm_ass(const struct gsm48_imm_ass *ia)
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{
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int rc;
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uint8_t ch_type, ch_subch, ch_ts;
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IA_RestOctets_t iaro;
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const uint8_t *iaro_raw = ((uint8_t *)ia) + sizeof(*ia) + ia->mob_alloc_len;
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size_t iaro_raw_len = GSM_MACBLOCK_LEN - (sizeof(*ia) + ia->mob_alloc_len);
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rc = rsl_dec_chan_nr(ia->chan_desc.chan_nr, &ch_type, &ch_subch, &ch_ts);
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if (rc != 0) {
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LOGRLCMAC(LOGL_ERROR, "rsl_dec_chan_nr(chan_nr=0x%02x) failed\n",
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ia->chan_desc.chan_nr);
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return rc;
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}
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rc = osmo_gprs_rlcmac_decode_imm_ass_ro(&iaro, iaro_raw, iaro_raw_len);
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if (rc != 0) {
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LOGRLCMAC(LOGL_ERROR, "Failed to decode IA Rest Octets IE\n");
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return rc;
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}
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switch (iaro.UnionType) {
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case 0: /* iaro.u.ll.* (IA_RestOctetsLL_t) */
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/* TODO: iaro.u.ll.Compressed_Inter_RAT_HO_INFO_IND */
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/* TODO: iaro.u.ll.AdditionsR13.* (IA_AdditionsR13_t) */
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break;
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case 1: /* iaro.u.lh.* (IA_RestOctetsLH_t) */
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switch (iaro.u.lh.lh0x.UnionType) {
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case 0: /* iaro.u.ll.lh0x.EGPRS_PktUlAss.* (IA_EGPRS_PktUlAss_t) */
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rc = gprs_rlcmac_handle_ccch_imm_ass_ul_tbf(ch_ts, ia, &iaro);
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break;
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case 1: /* iaro.u.ll.lh0x.MultiBlock_PktDlAss.* (IA_MultiBlock_PktDlAss_t) */
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rc = gprs_rlcmac_handle_ccch_imm_ass_dl_tbf(ch_ts, ia, &iaro);
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break;
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}
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/* TODO: iaro.u.lh.AdditionsR13.* (IA_AdditionsR13_t) */
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break;
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case 2: /* iaro.u.hl.* (IA_RestOctetsHL_t) */
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/* TODO: iaro.u.hl.IA_FrequencyParams (IA_FreqParamsBeforeTime_t) */
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/* TODO: iaro.u.hl.Compressed_Inter_RAT_HO_INFO_IND */
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/* TODO: iaro.u.hl.AdditionsR13.* (IA_AdditionsR13_t) */
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break;
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case 3: /* iaro.u.hh.* (IA_RestOctetsHH_t) */
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switch (iaro.u.hh.UnionType) {
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case 0: /* iaro.u.hh.u.UplinkDownlinkAssignment.* (IA_PacketAssignment_UL_DL_t) */
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switch (iaro.u.hh.u.UplinkDownlinkAssignment.UnionType) {
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case 0: /* iaro.u.hh.u.UplinkDownlinkAssignment.ul_dl.Packet_Uplink_ImmAssignment.* (Packet_Uplink_ImmAssignment_t) */
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switch (iaro.u.hh.u.UplinkDownlinkAssignment.ul_dl.Packet_Uplink_ImmAssignment.UnionType) {
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case 0: /* iaro.u.hh.u.UplinkDownlinkAssignment.ul_dl.Packet_Uplink_ImmAssignment.Access.SingleBlockAllocation.* (GPRS_SingleBlockAllocation_t) */
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/* TODO: 2phase access support: Schedule transmit of PKT_RES_REQ on FN=(GPRS_SingleBlockAllocation_t).TBF_STARTING_TIME */
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LOGRLCMAC(LOGL_ERROR, "ImmAss SingleBlock (2phase access) not yet supported!\n");
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break;
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case 1: /* iaro.u.hh.u.UplinkDownlinkAssignment.ul_dl.Packet_Uplink_ImmAssignment.Access.DynamicOrFixedAllocation.* (GPRS_DynamicOrFixedAllocation_t) */
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switch (iaro.u.hh.u.UplinkDownlinkAssignment.ul_dl.Packet_Uplink_ImmAssignment.Access.DynamicOrFixedAllocation.UnionType) {
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case 0: /* iaro.u.hh.u.UplinkDownlinkAssignment.ul_dl.Packet_Uplink_ImmAssignment.Access.DynamicOrFixedAllocation.Allocation.DynamicAllocation (DynamicAllocation_t) */
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rc = gprs_rlcmac_handle_ccch_imm_ass_ul_tbf(ch_ts, ia, &iaro);
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break;
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case 1: /* iaro.u.hh.u.UplinkDownlinkAssignment.ul_dl.Packet_Uplink_ImmAssignment.Access.DynamicOrFixedAllocation.Allocation.FixedAllocationDummy (guint8) */
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rc = gprs_rlcmac_handle_ccch_imm_ass_ul_tbf(ch_ts, ia, &iaro);
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break;
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}
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break;
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}
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break;
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case 1: /* iaro.u.hh.u.UplinkDownlinkAssignment.ul_dl.Packet_Downlink_ImmAssignment* (Packet_Downlink_ImmAssignment_t) */
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rc = gprs_rlcmac_handle_ccch_imm_ass_dl_tbf(ch_ts, ia, &iaro);
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break;
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}
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break;
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case 1: /* iaro.u.hh.u.SecondPartPacketAssignment.* (Second_Part_Packet_Assignment_t) */
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break;
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}
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break;
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}
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return rc;
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}
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int gprs_rlcmac_handle_bcch_si13(const struct gsm48_system_information_type_13 *si13)
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{
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int rc;
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LOGRLCMAC(LOGL_DEBUG, "Rx SI13 from lower layers\n");
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memcpy(g_ctx->si13, si13, GSM_MACBLOCK_LEN);
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rc = osmo_gprs_rlcmac_decode_si13ro(&g_ctx->si13ro, si13->rest_octets,
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GSM_MACBLOCK_LEN - offsetof(struct gsm48_system_information_type_13, rest_octets));
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if (rc < 0) {
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LOGRLCMAC(LOGL_ERROR, "Error decoding SI13: %s\n",
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osmo_hexdump((uint8_t *)si13, GSM_MACBLOCK_LEN));
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return rc;
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}
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g_ctx->si13_available = true;
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return rc;
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}
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static int gprs_rlcmac_handle_pkt_ul_ack_nack(const struct osmo_gprs_rlcmac_prim *rlcmac_prim, const RlcMacDownlink_t *dl_block)
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{
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struct gprs_rlcmac_ul_tbf *ul_tbf;
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int rc;
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ul_tbf = gprs_rlcmac_find_ul_tbf_by_tfi(dl_block->TFI);
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if (!ul_tbf) {
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LOGRLCMAC(LOGL_INFO, "TS=%u FN=%u Rx Pkt UL ACK/NACK: UL_TBF TFI=%u not found\n",
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rlcmac_prim->l1ctl.pdch_data_ind.ts_nr,
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rlcmac_prim->l1ctl.pdch_data_ind.fn,
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dl_block->TFI);
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return -ENOENT;
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}
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rc = gprs_rlcmac_ul_tbf_handle_pkt_ul_ack_nack(ul_tbf, dl_block);
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/* If RRBP contains valid data, schedule a response (PKT CONTROL ACK or PKT RESOURCE REQ). */
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if (dl_block->SP) {
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uint32_t poll_fn = rrbp2fn(rlcmac_prim->l1ctl.pdch_data_ind.fn, dl_block->RRBP);
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gprs_rlcmac_pdch_ulc_reserve(g_ctx->sched.ulc[rlcmac_prim->l1ctl.pdch_data_ind.ts_nr], poll_fn,
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GPRS_RLCMAC_PDCH_ULC_POLL_UL_ACK,
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ul_tbf_as_tbf(ul_tbf));
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}
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return rc;
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}
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static int gprs_rlcmac_handle_gprs_dl_ctrl_block(const struct osmo_gprs_rlcmac_prim *rlcmac_prim)
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{
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struct bitvec *bv;
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RlcMacDownlink_t *dl_ctrl_block;
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size_t max_len = gprs_rlcmac_mcs_max_bytes_dl(GPRS_RLCMAC_CS_1);
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int rc;
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bv = bitvec_alloc(max_len, g_ctx);
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OSMO_ASSERT(bv);
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bitvec_unpack(bv, rlcmac_prim->l1ctl.pdch_data_ind.data);
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dl_ctrl_block = (RlcMacDownlink_t *)talloc_zero(g_ctx, RlcMacDownlink_t);
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OSMO_ASSERT(dl_ctrl_block);
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rc = osmo_gprs_rlcmac_decode_downlink(bv, dl_ctrl_block);
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if (rc < 0) {
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LOGRLCMAC(LOGL_NOTICE, "Failed decoding dl ctrl block: %s\n",
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osmo_hexdump(rlcmac_prim->l1ctl.pdch_data_ind.data,
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rlcmac_prim->l1ctl.pdch_data_ind.data_len));
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goto free_ret;
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}
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LOGRLCMAC(LOGL_INFO, "TS=%u FN=%u Rx %s\n",
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rlcmac_prim->l1ctl.pdch_data_ind.ts_nr,
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rlcmac_prim->l1ctl.pdch_data_ind.fn,
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get_value_string(osmo_gprs_rlcmac_dl_msg_type_names, dl_ctrl_block->u.MESSAGE_TYPE));
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switch (dl_ctrl_block->u.MESSAGE_TYPE) {
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case OSMO_GPRS_RLCMAC_DL_MSGT_PACKET_UPLINK_ACK_NACK:
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rc = gprs_rlcmac_handle_pkt_ul_ack_nack(rlcmac_prim, dl_ctrl_block);
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break;
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default:
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LOGRLCMAC(LOGL_ERROR, "TS=%u FN=%u Rx %s NOT SUPPORTED! ignoring\n",
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rlcmac_prim->l1ctl.pdch_data_ind.ts_nr,
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rlcmac_prim->l1ctl.pdch_data_ind.fn,
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get_value_string(osmo_gprs_rlcmac_dl_msg_type_names, dl_ctrl_block->u.MESSAGE_TYPE));
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}
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free_ret:
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|
talloc_free(dl_ctrl_block);
|
|
bitvec_free(bv);
|
|
return rc;
|
|
}
|
|
|
|
static int gprs_rlcmac_handle_gprs_dl_data_block(const struct osmo_gprs_rlcmac_prim *rlcmac_prim,
|
|
enum gprs_rlcmac_coding_scheme cs)
|
|
{
|
|
const struct gprs_rlcmac_rlc_dl_data_header *data_hdr = (const struct gprs_rlcmac_rlc_dl_data_header *)rlcmac_prim->l1ctl.pdch_data_ind.data;
|
|
struct gprs_rlcmac_dl_tbf *dl_tbf;
|
|
struct gprs_rlcmac_rlc_data_info rlc_dec;
|
|
int rc;
|
|
|
|
rc = gprs_rlcmac_rlc_parse_dl_data_header(&rlc_dec, rlcmac_prim->l1ctl.pdch_data_ind.data, cs);
|
|
if (rc < 0) {
|
|
LOGRLCMAC(LOGL_ERROR, "Got %s DL data block but header parsing has failed\n",
|
|
gprs_rlcmac_mcs_name(cs));
|
|
return rc;
|
|
}
|
|
|
|
dl_tbf = gprs_rlcmac_find_dl_tbf_by_tfi(rlc_dec.tfi);
|
|
if (!dl_tbf) {
|
|
LOGRLCMAC(LOGL_INFO, "Rx DL data for unknown dl_tfi=%u\n", data_hdr->tfi);
|
|
return -ENOENT;
|
|
}
|
|
LOGPTBFDL(dl_tbf, LOGL_DEBUG, "Rx new DL data\n");
|
|
rc = gprs_rlcmac_dl_tbf_rcv_data_block(dl_tbf, &rlc_dec, rlcmac_prim->l1ctl.pdch_data_ind.data,
|
|
rlcmac_prim->l1ctl.pdch_data_ind.fn, rlcmac_prim->l1ctl.pdch_data_ind.ts_nr);
|
|
return rc;
|
|
}
|
|
|
|
int gprs_rlcmac_handle_gprs_dl_block(const struct osmo_gprs_rlcmac_prim *rlcmac_prim,
|
|
enum gprs_rlcmac_coding_scheme cs)
|
|
{
|
|
const struct gprs_rlcmac_rlc_dl_data_header *data_hdr = (const struct gprs_rlcmac_rlc_dl_data_header *)rlcmac_prim->l1ctl.pdch_data_ind.data;
|
|
/* Check block content (data vs ctrl) based on Payload Type: TS 44.060 10.4.7 */
|
|
switch ((enum gprs_rlcmac_payload_type)data_hdr->pt) {
|
|
case GPRS_RLCMAC_PT_DATA_BLOCK:
|
|
/* "Contains an RLC data block" */
|
|
return gprs_rlcmac_handle_gprs_dl_data_block(rlcmac_prim, cs);
|
|
case GPRS_RLCMAC_PT_CONTROL_BLOCK:
|
|
/* "Contains an RLC/MAC control block that does not include the optional octets of the RLC/MAC
|
|
* control header" */
|
|
return gprs_rlcmac_handle_gprs_dl_ctrl_block(rlcmac_prim);
|
|
case GPRS_RLCMAC_PT_CONTROL_BLOCK_OPT:
|
|
/* Contains an RLC/MAC control block that includes the optional first octet of the RLC/MAC
|
|
* control header" */
|
|
return gprs_rlcmac_handle_gprs_dl_ctrl_block(rlcmac_prim);
|
|
case GPRS_RLCMAC_PT_RESERVED: /* Reserved. In this version of the protocol, the mobile station shall ignore all fields of the
|
|
* RLC/MAC block except for the USF field */
|
|
return 0;
|
|
default:
|
|
OSMO_ASSERT(0);
|
|
}
|
|
}
|