420 lines
15 KiB
C
420 lines
15 KiB
C
/* TBF as per 3GPP TS 44.064 */
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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 <talloc.h>
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#include <osmocom/core/tdef.h>
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#include <osmocom/core/fsm.h>
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#include <osmocom/gprs/rlcmac/tbf_ul_fsm.h>
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#include <osmocom/gprs/rlcmac/tbf_ul.h>
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#include <osmocom/gprs/rlcmac/rlc_window_ul.h>
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#include <osmocom/gprs/rlcmac/gre.h>
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#define X(s) (1 << (s))
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static const struct value_string tbf_ul_fsm_event_names[] = {
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{ GPRS_RLCMAC_TBF_UL_EV_UL_ASS_START, "UL_ASS_START" },
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{ GPRS_RLCMAC_TBF_UL_EV_UL_ASS_COMPL, "UL_ASS_COMPL" },
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{ GPRS_RLCMAC_TBF_UL_EV_UL_ASS_REJ, "UL_ASS_REJ" },
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{ GPRS_RLCMAC_TBF_UL_EV_FIRST_UL_DATA_SENT, "FIRST_UL_DATA_SENT" },
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{ GPRS_RLCMAC_TBF_UL_EV_N3104_MAX, "N3104_MAX" },
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{ GPRS_RLCMAC_TBF_UL_EV_RX_UL_ACK_NACK, "RX_UL_ACK_NACK" },
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{ GPRS_RLCMAC_TBF_UL_EV_LAST_UL_DATA_SENT, "LAST_UL_DATA_SENT" },
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{ 0, NULL }
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};
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static const struct osmo_tdef_state_timeout tbf_ul_fsm_timeouts[32] = {
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[GPRS_RLCMAC_TBF_UL_ST_NEW] = { },
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[GPRS_RLCMAC_TBF_UL_ST_WAIT_ASSIGN] = { },
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[GPRS_RLCMAC_TBF_UL_ST_FLOW] = { .T = 3164 },
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[GPRS_RLCMAC_TBF_UL_ST_FINISHED] = { .keep_timer = true }, /* keep FLOW state's T3164 / T3166 */
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[GPRS_RLCMAC_TBF_UL_ST_RELEASING] = { },
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};
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/* Transition to a state, using the T timer defined in tbf_fsm_timeouts.
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* The actual timeout value is in turn obtained from conn->T_defs.
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* Assumes local variable fi exists. */
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#define tbf_ul_fsm_state_chg(fi, NEXT_STATE) \
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osmo_tdef_fsm_inst_state_chg(fi, NEXT_STATE, \
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tbf_ul_fsm_timeouts, \
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g_rlcmac_ctx->T_defs, \
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-1)
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static int configure_ul_tbf(const struct gprs_rlcmac_tbf_ul_fsm_ctx *ctx)
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{
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return gprs_rlcmac_ul_tbf_submit_configure_req(ctx->ul_tbf, &ctx->ul_tbf->cur_alloc,
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false, 0);
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}
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static int release_ul_tbf(const struct gprs_rlcmac_tbf_ul_fsm_ctx *ctx)
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{
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struct osmo_gprs_rlcmac_prim *rlcmac_prim;
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rlcmac_prim = gprs_rlcmac_prim_alloc_l1ctl_cfg_ul_tbf_req(ctx->tbf->nr, 0x00);
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LOGPFSML(ctx->fi, LOGL_INFO,
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"Send L1CTL-CFG_UL_TBF.req ul_tbf_nr=%u (release)\n",
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rlcmac_prim->l1ctl.cfg_ul_tbf_req.ul_tbf_nr);
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return gprs_rlcmac_prim_call_down_cb(rlcmac_prim);
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}
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static void reinit_pkt_acces_procedure(struct gprs_rlcmac_tbf_ul_fsm_ctx *ctx)
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{
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int rc;
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/* TS 44.060 sub-clause 7.1.4. Reinitiate the packet access procedure:
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* Move to NEW state, start Ass and wait for GPRS_RLCMAC_TBF_UL_ASS_EV_START */
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tbf_ul_fsm_state_chg(ctx->fi, GPRS_RLCMAC_TBF_UL_ST_NEW);
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/* We always use 1phase for now... */
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rc = gprs_rlcmac_tbf_ul_ass_start(ctx->ul_tbf, GPRS_RLCMAC_TBF_UL_ASS_TYPE_1PHASE);
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if (rc < 0)
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gprs_rlcmac_ul_tbf_free(ctx->ul_tbf);
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}
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/* 9.3.2.4.2 (acknowledged mode): When the mobile station has sent the RLC data
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* block with CV = 0 and there are no elements in the V(B) array set to the value
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* Nacked, it shall start timer T3182 for this TBF.
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* 9.3.3.3.2 (unacknowledged mode): Upon each retransmission of the last block
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* with CV=0, the mobile station shall restart timer T3182 for the TBF.
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* Slight impl deviation from spec: If tbf is still in contention resolution, keep using T3166, otherwise start T3182
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*/
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static void arm_T3182_if_needed(struct gprs_rlcmac_tbf_ul_fsm_ctx *ctx)
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{
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struct osmo_fsm_inst *fi = ctx->fi;
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unsigned long val_sec;
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if (gprs_rlcmac_ul_tbf_in_contention_resolution(ctx->ul_tbf)) {
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OSMO_ASSERT(fi->T == 3166);
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OSMO_ASSERT(osmo_timer_pending(&fi->timer));
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} else {
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OSMO_ASSERT(!osmo_timer_pending(&fi->timer) ||
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(osmo_timer_pending(&fi->timer) && fi->T == 3182));
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/* TODO: once unacked mode is supported: || unacked_mode(ctx->ul_tbf) */
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if (!osmo_timer_pending(&fi->timer)) {
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LOGPFSML(ctx->fi, LOGL_INFO, "Last UL block sent (CV=0), start T3182\n");
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fi->T = 3182;
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val_sec = osmo_tdef_get(g_rlcmac_ctx->T_defs, fi->T, OSMO_TDEF_S, -1);
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osmo_timer_schedule(&fi->timer, val_sec, 0);
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}
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}
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}
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static void _contention_resolution_succeeded(struct gprs_rlcmac_tbf_ul_fsm_ctx *ctx)
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{
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LOGPFSML(ctx->fi, LOGL_INFO, "Contention resolution succeeded, stop T3166\n");
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OSMO_ASSERT(ctx->ul_tbf->ul_ass_fsm.ass_type == GPRS_RLCMAC_TBF_UL_ASS_TYPE_1PHASE);
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OSMO_ASSERT(ctx->fi->T == 3166);
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osmo_timer_del(&ctx->fi->timer);
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ctx->fi->T = 0;
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/* TS 44.060 9.3.1.2: If in Countdown Procedure state, CV needs to be recalculated
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* since TBF is no longer transmitting TLLI in the block, hence 4 more bytes per
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* block are available. This means the new CV <= old CV. */
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gprs_rlcmac_ul_tbf_countdown_proc_update_cv(ctx->ul_tbf);
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}
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/* This one is triggered when packet access procedure fails, which can happen
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* either in WAIT_IMM_ASS (ImmAss timeout), FLOW (T3164) or FINISHED (T3164, T3166) */
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static void st_new_on_enter(struct osmo_fsm_inst *fi, uint32_t prev_state)
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{
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struct gprs_rlcmac_tbf_ul_fsm_ctx *ctx = (struct gprs_rlcmac_tbf_ul_fsm_ctx *)fi->priv;
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memset(&ctx->ul_tbf->cur_alloc, 0, sizeof(ctx->ul_tbf->cur_alloc));
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ctx->ul_tbf->n3104 = 0;
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/* Mark everything we transmitted so far as NACKed: */
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gprs_rlcmac_rlc_ul_window_mark_for_resend(ctx->ul_tbf->ulw);
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/* Make sure the lower layers realize this tbf_nr has no longer any assigned resource: */
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release_ul_tbf(ctx);
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/* Move back to CCCH */
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gprs_rlcmac_submit_l1ctl_pdch_rel_req();
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}
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static void st_new(struct osmo_fsm_inst *fi, uint32_t event, void *data)
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{
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//struct gprs_rlcmac_tbf_ul_fsm_ctx *ctx = (struct gprs_rlcmac_tbf_ul_fsm_ctx *)fi->priv;
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switch (event) {
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case GPRS_RLCMAC_TBF_UL_EV_UL_ASS_START:
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tbf_ul_fsm_state_chg(fi, GPRS_RLCMAC_TBF_UL_ST_WAIT_ASSIGN);
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break;
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default:
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OSMO_ASSERT(0);
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}
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}
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static void st_wait_assign(struct osmo_fsm_inst *fi, uint32_t event, void *data)
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{
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struct gprs_rlcmac_tbf_ul_fsm_ctx *ctx = (struct gprs_rlcmac_tbf_ul_fsm_ctx *)fi->priv;
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switch (event) {
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case GPRS_RLCMAC_TBF_UL_EV_UL_ASS_COMPL:
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/* Configure UL TBF on the lower MAC side: */
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configure_ul_tbf(ctx);
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tbf_ul_fsm_state_chg(fi, GPRS_RLCMAC_TBF_UL_ST_FLOW);
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break;
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case GPRS_RLCMAC_TBF_UL_EV_UL_ASS_REJ:
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gprs_rlcmac_ul_tbf_free(ctx->ul_tbf);
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break;
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default:
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OSMO_ASSERT(0);
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}
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}
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static void st_flow(struct osmo_fsm_inst *fi, uint32_t event, void *data)
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{
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struct gprs_rlcmac_tbf_ul_fsm_ctx *ctx = (struct gprs_rlcmac_tbf_ul_fsm_ctx *)fi->priv;
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unsigned long val_sec;
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switch (event) {
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case GPRS_RLCMAC_TBF_UL_EV_FIRST_UL_DATA_SENT:
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LOGPFSML(ctx->fi, LOGL_INFO, "First UL block sent, stop T3164\n");
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OSMO_ASSERT(fi->T == 3164);
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osmo_timer_del(&fi->timer);
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if (ctx->ul_tbf->ul_ass_fsm.ass_type == GPRS_RLCMAC_TBF_UL_ASS_TYPE_1PHASE) {
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LOGPFSML(ctx->fi, LOGL_INFO, "First UL block sent (1 phase access), start T3166\n");
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fi->T = 3166;
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val_sec = osmo_tdef_get(g_rlcmac_ctx->T_defs, fi->T, OSMO_TDEF_S, -1);
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osmo_timer_schedule(&fi->timer, val_sec, 0);
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}
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break;
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case GPRS_RLCMAC_TBF_UL_EV_N3104_MAX:
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reinit_pkt_acces_procedure(ctx);
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break;
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case GPRS_RLCMAC_TBF_UL_EV_RX_UL_ACK_NACK:
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if (gprs_rlcmac_ul_tbf_in_contention_resolution(ctx->ul_tbf)) {
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_contention_resolution_succeeded(ctx);
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}
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/* It's impossible we receive a correct final_ack here, since we didn't
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* sent last data (FSM would be in FINISHED state then) */
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break;
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case GPRS_RLCMAC_TBF_UL_EV_LAST_UL_DATA_SENT:
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arm_T3182_if_needed(ctx);
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tbf_ul_fsm_state_chg(fi, GPRS_RLCMAC_TBF_UL_ST_FINISHED);
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break;
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default:
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OSMO_ASSERT(0);
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}
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}
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static void st_finished(struct osmo_fsm_inst *fi, uint32_t event, void *data)
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{
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struct gprs_rlcmac_tbf_ul_fsm_ctx *ctx = (struct gprs_rlcmac_tbf_ul_fsm_ctx *)fi->priv;
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struct tbf_ul_ass_ev_rx_ul_ack_nack *ctx_ul_ack_nack;
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switch (event) {
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case GPRS_RLCMAC_TBF_UL_EV_N3104_MAX:
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reinit_pkt_acces_procedure(ctx);
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break;
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case GPRS_RLCMAC_TBF_UL_EV_RX_UL_ACK_NACK:
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ctx_ul_ack_nack = (struct tbf_ul_ass_ev_rx_ul_ack_nack *)data;
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if (gprs_rlcmac_ul_tbf_in_contention_resolution(ctx->ul_tbf)) {
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_contention_resolution_succeeded(ctx);
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} else if (fi->T == 3182 && osmo_timer_pending(&fi->timer)) {
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/* 9.3.3.3.2 "Upon reception of a PACKET UPLINK ACK/NACK message for this TBF
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* the mobile station shall stop timer T3182 for the TBF".
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* In our case we only use T3128 once we are out of contention resolution (T3166)
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*/
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LOGPFSML(ctx->fi, LOGL_DEBUG, "Rx Pkt UL ACK/NACK, stop T3182\n");
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osmo_timer_del(&fi->timer);
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fi->T = 0;
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}
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if (ctx_ul_ack_nack->final_ack) {
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LOGPFSML(ctx->fi, LOGL_DEBUG, "Final ACK received\n");
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ctx->rx_final_pkt_ul_ack_nack_has_tbf_est = ctx_ul_ack_nack->tbf_est;
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tbf_ul_fsm_state_chg(fi, GPRS_RLCMAC_TBF_UL_ST_RELEASING);
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}
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break;
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case GPRS_RLCMAC_TBF_UL_EV_LAST_UL_DATA_SENT:
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/* If LAST_UL_DATA_SENT is received in this state, it means the UL TBF is retransmitting the block. */
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ctx->last_data_block_retrans_attempts++;
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LOGPFSML(ctx->fi, LOGL_INFO, "Data block with CV=0 retransmit attempts=%u\n", ctx->last_data_block_retrans_attempts);
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arm_T3182_if_needed(ctx);
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/* 9.3.2.4.2 (Acknowledged mode): When the mobile station has sent the RLC data block with CV = 0 and there are no
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* elements in the V(B) array set to the value Nacked, it shall start timer T3182 for this TBF [...and ...] shall
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* continue to send RLC data blocks on each assigned uplink data block */
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#if 0
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/* 9.3.3.3.2 (Unacknowledged mode): The block with CV=0 shall not be retransmitted more than four times.
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* FIXME: Remove "if 0" when unacknowledged mode support is added. */
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if (ctx->last_data_block_retrans_attempts == 4) {
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LOGPFSML(ctx->fi, LOGL_NOTICE, "TBF establishment failure (Data block with CV=0 retransmit attempts=%u)\n",
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ctx->last_data_block_retrans_attempts);
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gprs_rlcmac_ul_tbf_free(ctx->ul_tbf);
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}
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#endif
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break;
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default:
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OSMO_ASSERT(0);
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}
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}
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/* Waiting for scheduler to transmit PKT CTRL ACK for the already received UL ACK/NACK FinalAck=1 */
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static void st_releasing(struct osmo_fsm_inst *fi, uint32_t event, void *data)
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{
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struct gprs_rlcmac_tbf_ul_fsm_ctx *ctx = (struct gprs_rlcmac_tbf_ul_fsm_ctx *)fi->priv;
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switch (event) {
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case GPRS_RLCMAC_TBF_UL_EV_TX_COMPL_PKT_CTRL_ACK:
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tbf_ul_free(ctx->ul_tbf);
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break;
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default:
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OSMO_ASSERT(0);
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}
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}
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static struct osmo_fsm_state tbf_ul_fsm_states[] = {
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[GPRS_RLCMAC_TBF_UL_ST_NEW] = {
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.in_event_mask =
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X(GPRS_RLCMAC_TBF_UL_EV_UL_ASS_START),
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.out_state_mask =
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X(GPRS_RLCMAC_TBF_UL_ST_WAIT_ASSIGN) |
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X(GPRS_RLCMAC_TBF_UL_ST_FLOW),
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.name = "NEW",
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.onenter = st_new_on_enter,
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.action = st_new,
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},
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[GPRS_RLCMAC_TBF_UL_ST_WAIT_ASSIGN] = {
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.in_event_mask =
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X(GPRS_RLCMAC_TBF_UL_EV_UL_ASS_COMPL) |
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X(GPRS_RLCMAC_TBF_UL_EV_UL_ASS_REJ),
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.out_state_mask =
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X(GPRS_RLCMAC_TBF_UL_ST_FLOW),
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.name = "ASSIGN",
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.action = st_wait_assign,
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},
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[GPRS_RLCMAC_TBF_UL_ST_FLOW] = {
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.in_event_mask =
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X(GPRS_RLCMAC_TBF_UL_EV_FIRST_UL_DATA_SENT) |
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X(GPRS_RLCMAC_TBF_UL_EV_N3104_MAX) |
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X(GPRS_RLCMAC_TBF_UL_EV_RX_UL_ACK_NACK) |
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X(GPRS_RLCMAC_TBF_UL_EV_LAST_UL_DATA_SENT),
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.out_state_mask =
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X(GPRS_RLCMAC_TBF_UL_ST_NEW) |
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X(GPRS_RLCMAC_TBF_UL_ST_FINISHED),
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.name = "FLOW",
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.action = st_flow,
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},
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[GPRS_RLCMAC_TBF_UL_ST_FINISHED] = {
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.in_event_mask =
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X(GPRS_RLCMAC_TBF_UL_EV_N3104_MAX) |
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X(GPRS_RLCMAC_TBF_UL_EV_RX_UL_ACK_NACK) |
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X(GPRS_RLCMAC_TBF_UL_EV_LAST_UL_DATA_SENT),
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.out_state_mask =
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X(GPRS_RLCMAC_TBF_UL_ST_NEW) |
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X(GPRS_RLCMAC_TBF_UL_ST_RELEASING),
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.name = "FINISHED",
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.action = st_finished,
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},
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[GPRS_RLCMAC_TBF_UL_ST_RELEASING] = {
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.in_event_mask = 0,
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.out_state_mask = 0,
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.name = "RELEASING",
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.action = st_releasing,
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},
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};
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static int tbf_ul_fsm_timer_cb(struct osmo_fsm_inst *fi)
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{
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struct gprs_rlcmac_tbf_ul_fsm_ctx *ctx = (struct gprs_rlcmac_tbf_ul_fsm_ctx *)fi->priv;
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switch (fi->T) {
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case 3164:
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ctx->pkt_acc_proc_attempts++;
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LOGPFSML(ctx->fi, LOGL_INFO, "T3164 timeout attempts=%u\n", ctx->pkt_acc_proc_attempts);
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OSMO_ASSERT(fi->state == GPRS_RLCMAC_TBF_UL_ST_FLOW);
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if (ctx->pkt_acc_proc_attempts == 4) {
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/* TS 44.060 7.1.4 "... the packet access procedure has already been attempted four time ..."
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* mobile station shall notify higher layers (TBF establishment failure) */
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/* TODO: find out how to notify higher layers */
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LOGPFSML(ctx->fi, LOGL_NOTICE, "TBF establishment failure (T3164 timeout attempts=%u)\n", ctx->pkt_acc_proc_attempts);
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gprs_rlcmac_ul_tbf_free(ctx->ul_tbf);
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return 0;
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}
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reinit_pkt_acces_procedure(ctx);
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break;
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case 3166:
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ctx->pkt_acc_proc_attempts++;
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LOGPFSML(ctx->fi, LOGL_INFO, "T3166 timeout attempts=%u\n", ctx->pkt_acc_proc_attempts);
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OSMO_ASSERT(fi->state == GPRS_RLCMAC_TBF_UL_ST_FLOW ||
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fi->state == GPRS_RLCMAC_TBF_UL_ST_FINISHED);
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if (ctx->pkt_acc_proc_attempts == 4) {
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/* TS 44.060 7.1.4 "... expiry of timers T3166 ... the
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* mobile station shall remain in packet idle mode and
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* notify higher layer (TBF establishment failure)" */
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/* TODO: find out how to notify higher layers */
|
|
LOGPFSML(ctx->fi, LOGL_NOTICE, "TBF establishment failure (T3166 timeout attempts=%u)\n", ctx->pkt_acc_proc_attempts);
|
|
gprs_rlcmac_ul_tbf_free(ctx->ul_tbf);
|
|
return 0;
|
|
}
|
|
reinit_pkt_acces_procedure(ctx);
|
|
break;
|
|
case 3182:
|
|
gprs_rlcmac_ul_tbf_free(ctx->ul_tbf);
|
|
break;
|
|
default:
|
|
OSMO_ASSERT(0);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct osmo_fsm tbf_ul_fsm = {
|
|
.name = "UL_TBF",
|
|
.states = tbf_ul_fsm_states,
|
|
.num_states = ARRAY_SIZE(tbf_ul_fsm_states),
|
|
.timer_cb = tbf_ul_fsm_timer_cb,
|
|
.log_subsys = DLGLOBAL, /* updated dynamically through gprs_rlcmac_tbf_ul_fsm_set_log_cat() */
|
|
.event_names = tbf_ul_fsm_event_names,
|
|
};
|
|
|
|
int gprs_rlcmac_tbf_ul_fsm_init(void)
|
|
{
|
|
return osmo_fsm_register(&tbf_ul_fsm);
|
|
}
|
|
|
|
void gprs_rlcmac_tbf_ul_fsm_set_log_cat(int logcat)
|
|
{
|
|
tbf_ul_fsm.log_subsys = logcat;
|
|
}
|
|
|
|
int gprs_rlcmac_tbf_ul_fsm_constructor(struct gprs_rlcmac_ul_tbf *ul_tbf)
|
|
{
|
|
struct gprs_rlcmac_tbf_ul_fsm_ctx *ctx = &ul_tbf->state_fsm;
|
|
ctx->ul_tbf = ul_tbf;
|
|
ctx->fi = osmo_fsm_inst_alloc(&tbf_ul_fsm, ul_tbf, ctx, LOGL_INFO, NULL);
|
|
if (!ctx->fi)
|
|
return -ENODATA;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void gprs_rlcmac_tbf_ul_fsm_destructor(struct gprs_rlcmac_ul_tbf *ul_tbf)
|
|
{
|
|
struct gprs_rlcmac_tbf_ul_fsm_ctx *ctx = &ul_tbf->state_fsm;
|
|
|
|
/* Make sure the lower layers realize this tbf_nr has no longer any assigned resource: */
|
|
release_ul_tbf(ctx);
|
|
|
|
osmo_fsm_inst_free(ctx->fi);
|
|
ctx->fi = NULL;
|
|
}
|
|
|
|
enum gprs_rlcmac_tbf_ul_fsm_states gprs_rlcmac_tbf_ul_state(const struct gprs_rlcmac_ul_tbf *ul_tbf)
|
|
{
|
|
const struct gprs_rlcmac_tbf_ul_fsm_ctx *ctx = &ul_tbf->state_fsm;
|
|
return ctx->fi->state;
|
|
}
|