353 lines
10 KiB
C
353 lines
10 KiB
C
/* tbf_ul_ass_fsm.c
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*
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* Copyright (C) 2021 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
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* Author: Pau Espin Pedrol <pespin@sysmocom.de>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <unistd.h>
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#include <talloc.h>
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#include <osmocom/core/bitvec.h>
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#include <tbf_ul_ass_fsm.h>
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#include <gprs_rlcmac.h>
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#include <gprs_debug.h>
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#include <gprs_ms.h>
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#include <encoding.h>
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#include <bts.h>
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#include <tbf.h>
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#include <tbf_ul.h>
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#define X(s) (1 << (s))
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const struct osmo_tdef_state_timeout tbf_ul_ass_fsm_timeouts[32] = {
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[TBF_UL_ASS_NONE] = {},
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[TBF_UL_ASS_SEND_ASS] = {},
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[TBF_UL_ASS_SEND_ASS_REJ] = {},
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[TBF_UL_ASS_WAIT_ACK] = {},
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};
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const struct value_string tbf_ul_ass_fsm_event_names[] = {
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{ TBF_UL_ASS_EV_SCHED_ASS, "SCHED_ASS" },
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{ TBF_UL_ASS_EV_SCHED_ASS_REJ, "SCHED_ASS_REJ" },
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{ TBF_UL_ASS_EV_CREATE_RLCMAC_MSG, "CREATE_RLCMAC_MSG" },
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{ TBF_UL_ASS_EV_RX_ASS_CTRL_ACK, "RX_ASS_CTRL_ACK" },
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{ TBF_UL_ASS_EV_ASS_POLL_TIMEOUT, "ASS_POLL_TIMEOUT" },
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{ TBF_UL_ASS_EV_ABORT, "ABORT" },
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{ 0, NULL }
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};
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static struct msgb *create_packet_access_reject(const struct tbf_ul_ass_fsm_ctx *ctx)
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{
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struct msgb *msg;
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struct GprsMs *ms = tbf_ms(ctx->tbf);
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msg = msgb_alloc(GSM_MACBLOCK_LEN, "rlcmac_ul_ass_rej");
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struct bitvec *packet_access_rej = bitvec_alloc(GSM_MACBLOCK_LEN, ctx->tbf);
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bitvec_unhex(packet_access_rej, DUMMY_VEC);
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write_packet_access_reject(packet_access_rej, ms_tlli(ms),
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osmo_tdef_get(ms->bts->T_defs_bts, 3172, OSMO_TDEF_MS, -1));
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bts_do_rate_ctr_inc(ms->bts, CTR_PKT_ACCESS_REJ);
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bitvec_pack(packet_access_rej, msgb_put(msg, GSM_MACBLOCK_LEN));
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bitvec_free(packet_access_rej);
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return msg;
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}
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struct msgb *create_packet_ul_assign(const struct tbf_ul_ass_fsm_ctx *ctx,
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const struct tbf_ul_ass_ev_create_rlcmac_msg_ctx *d)
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{
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struct msgb *msg = NULL;
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struct gprs_rlcmac_ul_tbf *new_tbf = NULL;
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RlcMacDownlink_t *mac_control_block = NULL;
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struct GprsMs *ms = tbf_ms(ctx->tbf);
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uint32_t tlli;
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int rc;
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unsigned int rrbp;
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uint32_t new_poll_fn;
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rc = tbf_check_polling(ctx->tbf, d->fn, d->ts, &new_poll_fn, &rrbp);
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if (rc < 0)
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return NULL;
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new_tbf = ms_ul_tbf(ms);
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if (!new_tbf) {
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LOGPTBF(ctx->tbf, LOGL_ERROR,
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"We have a schedule for uplink assignment, but there is no uplink TBF\n");
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tbf_ul_ass_fsm_state_chg(ctx->fi, TBF_UL_ASS_NONE);
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return NULL;
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}
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msg = msgb_alloc(GSM_MACBLOCK_LEN, "rlcmac_ul_ass");
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if (!msg)
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return NULL;
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/* Initialize a bit vector that uses allocated msgb as the data buffer. */
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struct bitvec bv = {
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.data = msgb_put(msg, GSM_MACBLOCK_LEN),
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.data_len = GSM_MACBLOCK_LEN,
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};
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bitvec_unhex(&bv, DUMMY_VEC);
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if (ctx->tbf != (struct gprs_rlcmac_tbf *)new_tbf)
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LOGPTBF(ctx->tbf, LOGL_INFO, "start Packet Uplink Assignment (PACCH) for %s\n",
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tbf_name((const struct gprs_rlcmac_tbf *)new_tbf));
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else
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LOGPTBF(ctx->tbf, LOGL_INFO, "start Packet Uplink Assignment (PACCH)\n");
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mac_control_block = (RlcMacDownlink_t *)talloc_zero(ctx->tbf, RlcMacDownlink_t);
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tlli = ms_tlli(ms);
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write_packet_uplink_assignment(mac_control_block, tbf_tfi(ctx->tbf),
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(tbf_direction(ctx->tbf) == GPRS_RLCMAC_DL_TBF), ms_tlli(ms),
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tlli != GSM_RESERVED_TMSI, new_tbf, 1, rrbp, bts_get_ms_pwr_alpha(ms->bts),
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the_pcu->vty.gamma, -1, tbf_is_egprs_enabled(ctx->tbf));
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LOGP(DTBF, LOGL_DEBUG, "+++++++++++++++++++++++++ TX : Packet Uplink Assignment +++++++++++++++++++++++++\n");
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rc = encode_gsm_rlcmac_downlink(&bv, mac_control_block);
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if (rc < 0) {
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LOGP(DTBF, LOGL_ERROR, "Encoding of Packet Uplink Ass failed (%d)\n", rc);
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goto free_ret;
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}
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LOGP(DTBF, LOGL_DEBUG, "------------------------- TX : Packet Uplink Assignment -------------------------\n");
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bts_do_rate_ctr_inc(ms->bts, CTR_PKT_UL_ASSIGNMENT);
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tbf_set_polling(ctx->tbf, new_poll_fn, d->ts, PDCH_ULC_POLL_UL_ASS);
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LOGPTBFUL(ctx->tbf, LOGL_INFO, "Scheduled UL Assignment polling on PACCH (FN=%d, TS=%d)\n",
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new_poll_fn, d->ts);
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talloc_free(mac_control_block);
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return msg;
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free_ret:
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talloc_free(mac_control_block);
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msgb_free(msg);
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return NULL;
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}
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static void st_none_on_enter(struct osmo_fsm_inst *fi, uint32_t prev_state)
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{
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struct tbf_ul_ass_fsm_ctx *ctx = (struct tbf_ul_ass_fsm_ctx *)fi->priv;
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unsigned long val;
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unsigned int sec, micro;
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/* Start release after rejecting only if it is UL TBF */
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if (prev_state == TBF_UL_ASS_SEND_ASS_REJ &&
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tbf_direction(ctx->tbf) == GPRS_RLCMAC_UL_TBF) {
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/* tbf_free() called upon trigger */
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fi->T = -2000;
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val = osmo_tdef_get(the_pcu->T_defs, fi->T, OSMO_TDEF_MS, -1);
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sec = val / 1000;
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micro = (val % 1000) * 1000;
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LOGPTBF(ctx->tbf, LOGL_DEBUG, "starting timer X2000 [reject (PACCH)] with %u sec. %u microsec\n",
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sec, micro);
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osmo_timer_schedule(&fi->timer, sec, micro);
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}
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}
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static void st_none(struct osmo_fsm_inst *fi, uint32_t event, void *data)
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{
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switch (event) {
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case TBF_UL_ASS_EV_SCHED_ASS:
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tbf_ul_ass_fsm_state_chg(fi, TBF_UL_ASS_SEND_ASS);
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break;
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case TBF_UL_ASS_EV_SCHED_ASS_REJ:
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tbf_ul_ass_fsm_state_chg(fi, TBF_UL_ASS_SEND_ASS_REJ);
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break;
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case TBF_UL_ASS_EV_ABORT:
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/* Nothing to do, we are already in proper state */
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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_send_ass(struct osmo_fsm_inst *fi, uint32_t event, void *data)
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{
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struct tbf_ul_ass_fsm_ctx *ctx = (struct tbf_ul_ass_fsm_ctx *)fi->priv;
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struct tbf_ul_ass_ev_create_rlcmac_msg_ctx *data_ctx;
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switch (event) {
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case TBF_UL_ASS_EV_CREATE_RLCMAC_MSG:
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data_ctx = (struct tbf_ul_ass_ev_create_rlcmac_msg_ctx *)data;
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data_ctx->msg = create_packet_ul_assign(ctx, data_ctx);
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if (!data_ctx->msg)
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return;
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tbf_ul_ass_fsm_state_chg(fi, TBF_UL_ASS_WAIT_ACK);
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break;
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case TBF_UL_ASS_EV_ABORT:
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/* Cancel pending schedule for Pkt Ul Ass: */
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tbf_ul_ass_fsm_state_chg(fi, TBF_UL_ASS_NONE);
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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_send_ass_rej(struct osmo_fsm_inst *fi, uint32_t event, void *data)
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{
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struct tbf_ul_ass_fsm_ctx *ctx = (struct tbf_ul_ass_fsm_ctx *)fi->priv;
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struct tbf_ul_ass_ev_create_rlcmac_msg_ctx *data_ctx;
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switch (event) {
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case TBF_UL_ASS_EV_CREATE_RLCMAC_MSG:
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data_ctx = (struct tbf_ul_ass_ev_create_rlcmac_msg_ctx *)data;
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data_ctx->msg = create_packet_access_reject(ctx);
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if (!data_ctx->msg)
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return;
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tbf_ul_ass_fsm_state_chg(fi, TBF_UL_ASS_NONE);
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break;
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case TBF_UL_ASS_EV_ABORT:
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/* Cancel pending schedule for Pkt Ul Ass Rej: */
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tbf_ul_ass_fsm_state_chg(fi, TBF_UL_ASS_NONE);
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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_ack(struct osmo_fsm_inst *fi, uint32_t event, void *data)
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{
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struct tbf_ul_ass_fsm_ctx *ctx = (struct tbf_ul_ass_fsm_ctx *)fi->priv;
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switch (event) {
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case TBF_UL_ASS_EV_RX_ASS_CTRL_ACK:
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tbf_ul_ass_fsm_state_chg(fi, TBF_UL_ASS_NONE);
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break;
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case TBF_UL_ASS_EV_ASS_POLL_TIMEOUT:
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LOGPTBF(ctx->tbf, LOGL_NOTICE,
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"Timeout for polling PACKET CONTROL ACK for PACKET UPLINK ASSIGNMENT: %s\n",
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tbf_rlcmac_diag(ctx->tbf));
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if (tbf_state(ctx->tbf) == TBF_ST_ASSIGN) {
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/* Reschedule Pkt Ul Ass */
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tbf_ul_ass_fsm_state_chg(fi, TBF_UL_ASS_SEND_ASS);
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} else {
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/* We are most probably in RELEASING, so stop retrying. */
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tbf_ul_ass_fsm_state_chg(fi, TBF_UL_ASS_NONE);
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}
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break;
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case TBF_UL_ASS_EV_ABORT:
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/* There's nothing we can do here, we already transmitted and
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* hence we must keep the POLL since the MS is already expected
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* to transmit there. Whenever we receive event CTRL_ACK or
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* TIMEOUT above, it will move back to ST_NONE autoamtically */
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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 int tbf_ul_ass_fsm_timer_cb(struct osmo_fsm_inst *fi)
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{
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struct tbf_ul_ass_fsm_ctx *ctx = (struct tbf_ul_ass_fsm_ctx *)fi->priv;
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switch (fi->T) {
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case -2000:
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tbf_free(ctx->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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return 0;
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}
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static struct osmo_fsm_state tbf_ul_ass_fsm_states[] = {
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[TBF_UL_ASS_NONE] = {
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.in_event_mask =
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X(TBF_UL_ASS_EV_SCHED_ASS) |
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X(TBF_UL_ASS_EV_SCHED_ASS_REJ) |
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X(TBF_UL_ASS_EV_ABORT),
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.out_state_mask =
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X(TBF_UL_ASS_SEND_ASS) |
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X(TBF_UL_ASS_SEND_ASS_REJ),
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.name = "NONE",
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.action = st_none,
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.onenter = st_none_on_enter,
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},
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[TBF_UL_ASS_SEND_ASS] = {
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.in_event_mask =
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X(TBF_UL_ASS_EV_CREATE_RLCMAC_MSG) |
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X(TBF_UL_ASS_EV_ABORT),
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.out_state_mask =
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X(TBF_UL_ASS_WAIT_ACK) |
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X(TBF_UL_ASS_NONE),
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.name = "SEND_ASS",
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.action = st_send_ass,
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},
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[TBF_UL_ASS_SEND_ASS_REJ] = {
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.in_event_mask =
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X(TBF_UL_ASS_EV_CREATE_RLCMAC_MSG) |
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X(TBF_UL_ASS_EV_ABORT),
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.out_state_mask = X(TBF_UL_ASS_NONE),
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.name = "SEND_ASS_REJ",
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.action = st_send_ass_rej,
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},
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[TBF_UL_ASS_WAIT_ACK] = {
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.in_event_mask =
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X(TBF_UL_ASS_EV_RX_ASS_CTRL_ACK) |
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X(TBF_UL_ASS_EV_ASS_POLL_TIMEOUT) |
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X(TBF_UL_ASS_EV_ABORT),
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.out_state_mask =
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X(TBF_UL_ASS_NONE) |
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X(TBF_UL_ASS_SEND_ASS),
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.name = "WAIT_ACK",
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.action = st_wait_ack,
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},
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};
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struct osmo_fsm tbf_ul_ass_fsm = {
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.name = "UL_ASS_TBF",
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.states = tbf_ul_ass_fsm_states,
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.num_states = ARRAY_SIZE(tbf_ul_ass_fsm_states),
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.timer_cb = tbf_ul_ass_fsm_timer_cb,
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.log_subsys = DTBF,
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.event_names = tbf_ul_ass_fsm_event_names,
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};
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static __attribute__((constructor)) void tbf_ul_ass_fsm_init(void)
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{
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OSMO_ASSERT(osmo_fsm_register(&tbf_ul_ass_fsm) == 0);
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}
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struct msgb *tbf_ul_ass_create_rlcmac_msg(const struct gprs_rlcmac_tbf* tbf, uint32_t fn, uint8_t ts)
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{
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int rc;
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struct tbf_ul_ass_ev_create_rlcmac_msg_ctx data_ctx = {
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.fn = fn,
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.ts = ts,
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.msg = NULL,
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};
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rc = osmo_fsm_inst_dispatch(tbf_ul_ass_fi(tbf), TBF_UL_ASS_EV_CREATE_RLCMAC_MSG, &data_ctx);
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if (rc != 0 || !data_ctx.msg)
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return NULL;
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return data_ctx.msg;
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}
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bool tbf_ul_ass_rts(const struct gprs_rlcmac_tbf* tbf)
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{
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struct osmo_fsm_inst *fi = tbf_ul_ass_fi(tbf);
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return fi->state == TBF_UL_ASS_SEND_ASS || fi->state == TBF_UL_ASS_SEND_ASS_REJ;
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}
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