1645 lines
51 KiB
C++
1645 lines
51 KiB
C++
/* Data block transfer
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*
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* Copyright (C) 2012 Ivan Klyuchnikov
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* Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu>
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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 <gprs_bssgp_pcu.h>
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#include <gprs_rlcmac.h>
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#include <pcu_l1_if.h>
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extern void *tall_pcu_ctx;
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extern "C" {
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int bssgp_tx_llc_discarded(struct bssgp_bvc_ctx *bctx, uint32_t tlli,
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uint8_t num_frames, uint32_t num_octets);
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}
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/* After receiving these frames, we send ack/nack. */
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#define SEND_ACK_AFTER_FRAMES 20
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/* After sending these frames, we poll for ack/nack. */
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#define POLL_ACK_AFTER_FRAMES 10
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/* If acknowledgement to uplink/downlink assignmentshould be polled */
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#define POLLING_ASSIGNMENT_DL 1
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#define POLLING_ASSIGNMENT_UL 1
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extern "C" {
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/* TS 04.60 10.2.2 */
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struct rlc_ul_header {
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uint8_t r:1,
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si:1,
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cv:4,
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pt:2;
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uint8_t ti:1,
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tfi:5,
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pi:1,
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spare:1;
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uint8_t e:1,
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bsn:7;
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} __attribute__ ((packed));
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struct rlc_dl_header {
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uint8_t usf:3,
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s_p:1,
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rrbp:2,
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pt:2;
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uint8_t fbi:1,
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tfi:5,
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pr:2;
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uint8_t e:1,
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bsn:7;
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} __attribute__ ((packed));
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struct rlc_li_field {
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uint8_t e:1,
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m:1,
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li:6;
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} __attribute__ ((packed));
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}
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static int gprs_rlcmac_diag(struct gprs_rlcmac_tbf *tbf)
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{
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if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH)))
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LOGP(DRLCMAC, LOGL_NOTICE, "- Assignment was on CCCH\n");
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if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_PACCH)))
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LOGP(DRLCMAC, LOGL_NOTICE, "- Assignment was on PACCH\n");
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if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_UL_DATA)))
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LOGP(DRLCMAC, LOGL_NOTICE, "- Uplink data was received\n");
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else if (tbf->direction == GPRS_RLCMAC_UL_TBF)
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LOGP(DRLCMAC, LOGL_NOTICE, "- No uplink data received yet\n");
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if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_DL_ACK)))
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LOGP(DRLCMAC, LOGL_NOTICE, "- Downlink ACK was received\n");
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else if (tbf->direction == GPRS_RLCMAC_DL_TBF)
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LOGP(DRLCMAC, LOGL_NOTICE, "- No downlink ACK received yet\n");
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return 0;
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}
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int gprs_rlcmac_poll_timeout(struct gprs_rlcmac_tbf *tbf)
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{
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LOGP(DRLCMAC, LOGL_NOTICE, "Poll timeout for %s TBF=%d\n",
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(tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tbf->tfi);
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tbf->poll_state = GPRS_RLCMAC_POLL_NONE;
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if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_WAIT_ACK) {
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if (!(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_UL_ACK))) {
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LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling "
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"PACKET CONTROL ACK for PACKET UPLINK ACK\n");
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gprs_rlcmac_diag(tbf);
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tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_UL_ACK);
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}
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tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE;
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if (tbf->state == GPRS_RLCMAC_FINISHED) {
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struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
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tbf->dir.ul.n3103++;
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if (tbf->dir.ul.n3103 == bts->n3103) {
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LOGP(DRLCMAC, LOGL_NOTICE,
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"- N3103 exceeded\n");
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tbf_new_state(tbf, GPRS_RLCMAC_RELEASING);
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tbf_timer_start(tbf, 3169, bts->t3169, 0);
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return 0;
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}
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/* reschedule UL ack */
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tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_SEND_ACK;
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}
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} else
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if (tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_WAIT_ACK) {
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struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
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if (!(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_UL_ASS))) {
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LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling "
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"PACKET CONTROL ACK for PACKET UPLINK "
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"ASSIGNMENT.\n");
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gprs_rlcmac_diag(tbf);
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tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_UL_ASS);
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}
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tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE;
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tbf->n3105++;
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if (tbf->n3105 == bts->n3105) {
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LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n");
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tbf_new_state(tbf, GPRS_RLCMAC_RELEASING);
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tbf_timer_start(tbf, 3195, bts->t3195, 0);
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return 0;
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}
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/* reschedule UL assignment */
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tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS;
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} else
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if (tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_WAIT_ACK) {
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struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
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if (!(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ASS))) {
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LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling "
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"PACKET CONTROL ACK for PACKET DOWNLINK "
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"ASSIGNMENT.\n");
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gprs_rlcmac_diag(tbf);
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tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_DL_ASS);
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}
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tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE;
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tbf->n3105++;
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if (tbf->n3105 == bts->n3105) {
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LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n");
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tbf_new_state(tbf, GPRS_RLCMAC_RELEASING);
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tbf_timer_start(tbf, 3195, bts->t3195, 0);
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return 0;
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}
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/* reschedule DL assignment */
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tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_SEND_ASS;
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} else
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if (tbf->direction == GPRS_RLCMAC_DL_TBF) {
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struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
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if (!(tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK))) {
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LOGP(DRLCMAC, LOGL_NOTICE, "- Timeout for polling "
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"PACKET DOWNLINK ACK.\n");
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gprs_rlcmac_diag(tbf);
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tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK);
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}
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tbf->n3105++;
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if (tbf->n3105 == bts->n3105) {
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LOGP(DRLCMAC, LOGL_NOTICE, "- N3105 exceeded\n");
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tbf_new_state(tbf, GPRS_RLCMAC_RELEASING);
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tbf_timer_start(tbf, 3195, bts->t3195, 0);
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return 0;
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}
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} else
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LOGP(DRLCMAC, LOGL_ERROR, "- Poll Timeout, but no event!\n");
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return 0;
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}
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/* Received Uplink RLC control block. */
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int gprs_rlcmac_rcv_control_block(bitvec *rlc_block, uint8_t trx, uint8_t ts,
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uint32_t fn)
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{
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struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
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int8_t tfi = 0; /* must be signed */
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uint32_t tlli = 0;
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struct gprs_rlcmac_tbf *tbf;
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int rc;
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RlcMacUplink_t * ul_control_block = (RlcMacUplink_t *)talloc_zero(tall_pcu_ctx, RlcMacUplink_t);
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LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++\n");
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decode_gsm_rlcmac_uplink(rlc_block, ul_control_block);
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LOGPC(DCSN1, LOGL_NOTICE, "\n");
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LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- RX : Uplink Control Block -------------------------\n");
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switch (ul_control_block->u.MESSAGE_TYPE) {
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case MT_PACKET_CONTROL_ACK:
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tlli = ul_control_block->u.Packet_Control_Acknowledgement.TLLI;
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tbf = tbf_by_poll_fn(fn, trx, ts);
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if (!tbf) {
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LOGP(DRLCMAC, LOGL_NOTICE, "PACKET CONTROL ACK with "
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"unknown FN=%u TLL=0x%08x (TRX %d TS %d)\n",
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fn, tlli, trx, ts);
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break;
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}
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tfi = tbf->tfi;
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if (tlli != tbf->tlli) {
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LOGP(DRLCMAC, LOGL_INFO, "Phone changed TLLI to "
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"0x%08x\n", tlli);
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tbf->tlli = tlli;
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}
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LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] TFI: %u TLLI: 0x%08x Packet Control Ack\n", tbf->tfi, tbf->tlli);
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tbf->poll_state = GPRS_RLCMAC_POLL_NONE;
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/* check if this control ack belongs to packet uplink ack */
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if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_WAIT_ACK) {
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LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [UPLINK] END TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli);
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tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE;
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if ((tbf->state_flags &
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(1 << GPRS_RLCMAC_FLAG_TO_UL_ACK))) {
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tbf->state_flags &=
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~(1 << GPRS_RLCMAC_FLAG_TO_UL_ACK);
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LOGP(DRLCMAC, LOGL_NOTICE, "Recovered uplink "
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"ack\n");
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}
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tbf_free(tbf);
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break;
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}
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if (tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_WAIT_ACK) {
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LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [UPLINK] DOWNLINK ASSIGNED TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli);
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/* reset N3105 */
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tbf->n3105 = 0;
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tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE;
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if (tbf->direction == GPRS_RLCMAC_UL_TBF)
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tbf = tbf_by_tlli(tbf->tlli,
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GPRS_RLCMAC_DL_TBF);
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if (!tbf) {
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LOGP(DRLCMAC, LOGL_ERROR, "Got ACK, but DL "
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"TBF is gone\n");
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break;
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}
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tbf_new_state(tbf, GPRS_RLCMAC_FLOW);
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if ((tbf->state_flags &
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(1 << GPRS_RLCMAC_FLAG_TO_DL_ASS))) {
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tbf->state_flags &=
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~(1 << GPRS_RLCMAC_FLAG_TO_DL_ASS);
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LOGP(DRLCMAC, LOGL_NOTICE, "Recovered downlink "
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"assignment\n");
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}
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tbf_assign_control_ts(tbf);
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break;
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}
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if (tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_WAIT_ACK) {
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LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [DOWNLINK] UPLINK ASSIGNED TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli);
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/* reset N3105 */
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tbf->n3105 = 0;
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tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE;
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if (tbf->direction == GPRS_RLCMAC_DL_TBF)
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tbf = tbf_by_tlli(tbf->tlli,
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GPRS_RLCMAC_UL_TBF);
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if (!tbf) {
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LOGP(DRLCMAC, LOGL_ERROR, "Got ACK, but UL "
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"TBF is gone\n");
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break;
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}
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tbf_new_state(tbf, GPRS_RLCMAC_FLOW);
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if ((tbf->state_flags &
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(1 << GPRS_RLCMAC_FLAG_TO_UL_ASS))) {
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tbf->state_flags &=
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~(1 << GPRS_RLCMAC_FLAG_TO_UL_ASS);
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LOGP(DRLCMAC, LOGL_NOTICE, "Recovered uplink "
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"assignment\n");
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}
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tbf_assign_control_ts(tbf);
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break;
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}
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LOGP(DRLCMAC, LOGL_ERROR, "Error: received PACET CONTROL ACK "
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"at no request\n");
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break;
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case MT_PACKET_DOWNLINK_ACK_NACK:
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tfi = ul_control_block->u.Packet_Downlink_Ack_Nack.DOWNLINK_TFI;
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tbf = tbf_by_poll_fn(fn, trx, ts);
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if (!tbf) {
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LOGP(DRLCMAC, LOGL_NOTICE, "PACKET DOWNLINK ACK with "
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"unknown FN=%u TBF=%d (TRX %d TS %d)\n",
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fn, tfi, trx, ts);
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break;
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}
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tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_DL_ACK);
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if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK))) {
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tbf->state_flags &= ~(1 << GPRS_RLCMAC_FLAG_TO_DL_ACK);
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LOGP(DRLCMAC, LOGL_NOTICE, "Recovered downlink ack\n");
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}
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/* reset N3105 */
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tbf->n3105 = 0;
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/* stop timer T3191 */
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tbf_timer_stop(tbf);
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tlli = tbf->tlli;
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LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] TFI: %u TLLI: 0x%08x Packet Downlink Ack/Nack\n", tbf->tfi, tbf->tlli);
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tbf->poll_state = GPRS_RLCMAC_POLL_NONE;
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rc = gprs_rlcmac_downlink_ack(tbf,
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ul_control_block->u.Packet_Downlink_Ack_Nack.Ack_Nack_Description.FINAL_ACK_INDICATION,
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ul_control_block->u.Packet_Downlink_Ack_Nack.Ack_Nack_Description.STARTING_SEQUENCE_NUMBER,
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ul_control_block->u.Packet_Downlink_Ack_Nack.Ack_Nack_Description.RECEIVED_BLOCK_BITMAP);
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if (rc == 1) {
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tbf_free(tbf);
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break;
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}
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/* check for channel request */
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if (ul_control_block->u.Packet_Downlink_Ack_Nack.Exist_Channel_Request_Description) {
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uint8_t trx, ts;
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struct gprs_rlcmac_tbf *ul_tbf;
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LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF in ack "
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"message, so we provide one:\n");
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uplink_request:
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/* create new TBF, use sme TRX as DL TBF */
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tfi = tfi_alloc(GPRS_RLCMAC_UL_TBF, &trx, &ts, tbf->trx, tbf->first_ts);
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if (tfi < 0) {
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LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n");
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/* FIXME: send reject */
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break;
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}
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/* use multislot class of downlink TBF */
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ul_tbf = tbf_alloc(tbf, GPRS_RLCMAC_UL_TBF, tfi, trx,
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ts, tbf->ms_class, 0);
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if (!ul_tbf) {
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LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n");
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/* FIXME: send reject */
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break;
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}
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ul_tbf->tlli = tbf->tlli;
|
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ul_tbf->tlli_valid = 1; /* no contention resolution */
|
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ul_tbf->dir.ul.contention_resolution_done = 1;
|
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ul_tbf->ta = tbf->ta; /* use current TA */
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tbf_new_state(ul_tbf, GPRS_RLCMAC_ASSIGN);
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ul_tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_PACCH);
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tbf_timer_start(ul_tbf, 3169, bts->t3169, 0);
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/* schedule uplink assignment */
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tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS;
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}
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break;
|
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case MT_PACKET_RESOURCE_REQUEST:
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if (ul_control_block->u.Packet_Resource_Request.ID.UnionType) {
|
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tlli = ul_control_block->u.Packet_Resource_Request.ID.u.TLLI;
|
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tbf = tbf_by_tlli(tlli, GPRS_RLCMAC_UL_TBF);
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if (!tbf) {
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LOGP(DRLCMAC, LOGL_NOTICE, "PACKET RESSOURCE REQ unknown uplink TLLI=0x%08x\n", tlli);
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break;
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}
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tfi = tbf->tfi;
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} else {
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if (ul_control_block->u.Packet_Resource_Request.ID.u.Global_TFI.UnionType) {
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tfi = ul_control_block->u.Packet_Resource_Request.ID.u.Global_TFI.u.DOWNLINK_TFI;
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tbf = tbf_by_tfi(tfi, trx, ts, GPRS_RLCMAC_DL_TBF);
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if (!tbf) {
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LOGP(DRLCMAC, LOGL_NOTICE, "PACKET RESSOURCE REQ unknown downlink TBF=%d\n", tlli);
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break;
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}
|
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} else {
|
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tfi = ul_control_block->u.Packet_Resource_Request.ID.u.Global_TFI.u.UPLINK_TFI;
|
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tbf = tbf_by_tfi(tfi, trx, ts, GPRS_RLCMAC_UL_TBF);
|
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if (!tbf) {
|
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LOGP(DRLCMAC, LOGL_NOTICE, "PACKET RESSOURCE REQ unknown uplink TBF=%d\n", tlli);
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break;
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}
|
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}
|
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tlli = tbf->tlli;
|
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}
|
|
LOGP(DRLCMAC, LOGL_ERROR, "RX: [PCU <- BTS] %s TFI: %u TLLI: 0x%08x FIXME: Packet ressource request\n", (tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tbf->tfi, tbf->tlli);
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break;
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default:
|
|
LOGP(DRLCMAC, LOGL_NOTICE, "RX: [PCU <- BTS] unknown control block received\n");
|
|
}
|
|
talloc_free(ul_control_block);
|
|
return 1;
|
|
}
|
|
|
|
#ifdef DEBUG_DL_ASS_IDLE
|
|
char debug_imsi[16];
|
|
#endif
|
|
|
|
void tbf_timer_cb(void *_tbf)
|
|
{
|
|
struct gprs_rlcmac_tbf *tbf = (struct gprs_rlcmac_tbf *)_tbf;
|
|
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "%s TBF=%d timer %u expired.\n",
|
|
(tbf->direction == GPRS_RLCMAC_UL_TBF) ? "UL" : "DL", tbf->tfi,
|
|
tbf->T);
|
|
|
|
tbf->num_T_exp++;
|
|
|
|
switch (tbf->T) {
|
|
#ifdef DEBUG_DL_ASS_IDLE
|
|
case 1234:
|
|
gprs_rlcmac_trigger_downlink_assignment(tbf, NULL, debug_imsi);
|
|
break;
|
|
#endif
|
|
case 0: /* assignment */
|
|
/* change state to FLOW, so scheduler will start transmission */
|
|
if (tbf->state == GPRS_RLCMAC_ASSIGN) {
|
|
tbf_new_state(tbf, GPRS_RLCMAC_FLOW);
|
|
tbf_assign_control_ts(tbf);
|
|
} else
|
|
LOGP(DRLCMAC, LOGL_ERROR, "Error: TBF is not in assign "
|
|
"state\n");
|
|
break;
|
|
case 3169:
|
|
case 3191:
|
|
case 3195:
|
|
LOGP(DRLCMAC, LOGL_NOTICE, "TBF T%d timeout during "
|
|
"transsmission\n", tbf->T);
|
|
gprs_rlcmac_diag(tbf);
|
|
/* fall through */
|
|
case 3193:
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "TBF will be freed due to timeout\n");
|
|
/* free TBF */
|
|
tbf_free(tbf);
|
|
break;
|
|
default:
|
|
LOGP(DRLCMAC, LOGL_ERROR, "Timer expired in unknown mode: %u\n",
|
|
tbf->T);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* UL data block flow
|
|
*/
|
|
|
|
/* get TLLI from received UL data block */
|
|
static int tlli_from_ul_data(uint8_t *data, uint8_t len, uint32_t *tlli)
|
|
{
|
|
struct rlc_ul_header *rh = (struct rlc_ul_header *)data;
|
|
struct rlc_li_field *li;
|
|
uint8_t e;
|
|
|
|
if (!rh->ti)
|
|
return -EINVAL;
|
|
|
|
data += 3;
|
|
len -= 3;
|
|
e = rh->e;
|
|
/* if E is not set (LI follows) */
|
|
while (!e) {
|
|
if (!len) {
|
|
LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA LI extended, "
|
|
"but no more data\n");
|
|
return -EINVAL;
|
|
}
|
|
/* get new E */
|
|
li = (struct rlc_li_field *)data;
|
|
if (li->e == 0) /* if LI==0, E is interpreted as '1' */
|
|
e = 1;
|
|
else
|
|
e = li->e;
|
|
data++;
|
|
len--;
|
|
}
|
|
if (len < 4) {
|
|
LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TLLI out of frame "
|
|
"border\n");
|
|
return -EINVAL;
|
|
}
|
|
*tlli = ntohl(*((uint32_t *)data));
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Store received block data in LLC message(s) and forward to SGSN if complete.
|
|
*/
|
|
static int gprs_rlcmac_assemble_llc(struct gprs_rlcmac_tbf *tbf, uint8_t *data,
|
|
uint8_t len)
|
|
{
|
|
struct rlc_ul_header *rh = (struct rlc_ul_header *)data;
|
|
uint8_t e, m;
|
|
struct rlc_li_field *li;
|
|
uint8_t frame_offset[16], offset = 0, chunk;
|
|
int i, frames = 0;
|
|
|
|
LOGP(DRLCMACUL, LOGL_DEBUG, "- Assembling frames: (len=%d)\n", len);
|
|
|
|
data += 3;
|
|
len -= 3;
|
|
e = rh->e; /* if extended */
|
|
m = 1; /* more frames, that means: the first frame */
|
|
|
|
/* Parse frame offsets from length indicator(s), if any. */
|
|
while (1) {
|
|
if (frames == (int)sizeof(frame_offset)) {
|
|
LOGP(DRLCMACUL, LOGL_ERROR, "Too many frames in "
|
|
"block\n");
|
|
return -EINVAL;
|
|
}
|
|
frame_offset[frames++] = offset;
|
|
LOGP(DRLCMACUL, LOGL_DEBUG, "-- Frame %d starts at offset "
|
|
"%d\n", frames, offset);
|
|
if (!len)
|
|
break;
|
|
/* M == 0 and E == 0 is not allowed in this version. */
|
|
if (!m && !e) {
|
|
LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TBF=%d "
|
|
"ignored, because M='0' and E='0'.\n",
|
|
tbf->tfi);
|
|
return 0;
|
|
}
|
|
/* no more frames in this segment */
|
|
if (e) {
|
|
break;
|
|
}
|
|
/* There is a new frame and an LI that delimits it. */
|
|
if (m) {
|
|
li = (struct rlc_li_field *)data;
|
|
LOGP(DRLCMACUL, LOGL_DEBUG, "-- Delimiter len=%d\n",
|
|
li->li);
|
|
/* Special case: LI == 0
|
|
* If the last segment would fit precisely into the
|
|
* rest of the RLC MAC block, there would be no way
|
|
* to delimit that this segment ends and is not
|
|
* continued in the next block.
|
|
* The special LI (0) is used to force the segment to
|
|
* extend into the next block, so it is delimited there.
|
|
* This LI must be skipped. Also it is the last LI.
|
|
*/
|
|
if (li->li == 0) {
|
|
data++;
|
|
len--;
|
|
m = 1; /* M is ignored, we know there is more */
|
|
break; /* handle E as '1', so we break! */
|
|
}
|
|
e = li->e;
|
|
m = li->m;
|
|
offset += li->li;
|
|
data++;
|
|
len--;
|
|
continue;
|
|
}
|
|
}
|
|
if (!m) {
|
|
LOGP(DRLCMACUL, LOGL_DEBUG, "- Last frame carries spare "
|
|
"data\n");
|
|
}
|
|
|
|
LOGP(DRLCMACUL, LOGL_DEBUG, "- Data length after length fields: %d\n",
|
|
len);
|
|
/* TLLI */
|
|
if (rh->ti) {
|
|
if (len < 4) {
|
|
LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TLLI out of "
|
|
"frame border\n");
|
|
return -EINVAL;
|
|
}
|
|
data += 4;
|
|
len -= 4;
|
|
LOGP(DRLCMACUL, LOGL_DEBUG, "- Length after skipping TLLI: "
|
|
"%d\n", len);
|
|
}
|
|
|
|
/* PFI */
|
|
if (rh->pi) {
|
|
LOGP(DRLCMACUL, LOGL_ERROR, "ERROR: PFI not supported, "
|
|
"please disable in SYSTEM INFORMATION\n");
|
|
if (len < 1) {
|
|
LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA PFI out of "
|
|
"frame border\n");
|
|
return -EINVAL;
|
|
}
|
|
data++;
|
|
len--;
|
|
LOGP(DRLCMACUL, LOGL_DEBUG, "- Length after skipping PFI: "
|
|
"%d\n", len);
|
|
}
|
|
|
|
/* Now we have:
|
|
* - a list of frames offsets: frame_offset[]
|
|
* - number of frames: i
|
|
* - m == 0: Last frame carries spare data (end of TBF).
|
|
*/
|
|
|
|
/* Check if last offset would exceed frame. */
|
|
if (offset > len) {
|
|
LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TBF=%d ignored, "
|
|
"because LI delimits data that exceeds block size.\n",
|
|
tbf->tfi);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* create LLC frames */
|
|
for (i = 0; i < frames; i++) {
|
|
/* last frame ? */
|
|
if (i == frames - 1) {
|
|
/* no more data in last frame */
|
|
if (!m)
|
|
break;
|
|
/* data until end of frame */
|
|
chunk = len - frame_offset[i];
|
|
} else {
|
|
/* data until next frame */
|
|
chunk = frame_offset[i + 1] - frame_offset[i];
|
|
}
|
|
LOGP(DRLCMACUL, LOGL_DEBUG, "-- Appending chunk (len=%d) to "
|
|
"frame at %d.\n", chunk, tbf->llc_index);
|
|
if (tbf->llc_index + chunk > LLC_MAX_LEN) {
|
|
LOGP(DRLCMACUL, LOGL_NOTICE, "LLC frame exceeds "
|
|
"maximum size.\n");
|
|
chunk = LLC_MAX_LEN - tbf->llc_index;
|
|
}
|
|
memcpy(tbf->llc_frame + tbf->llc_index, data + frame_offset[i],
|
|
chunk);
|
|
tbf->llc_index += chunk;
|
|
/* not last frame. */
|
|
if (i != frames - 1) {
|
|
/* send frame to SGSN */
|
|
LOGP(DRLCMACUL, LOGL_INFO, "Complete UL frame for "
|
|
"TBF=%d: len=%d\n", tbf->tfi, tbf->llc_index);
|
|
gprs_rlcmac_tx_ul_ud(tbf);
|
|
tbf->llc_index = 0; /* reset frame space */
|
|
/* also check if CV==0, because the frame may fill up the
|
|
* block precisely, then it is also complete. normally the
|
|
* frame would be extended into the next block with a 0-length
|
|
* delimiter added to this block. */
|
|
} else if (rh->cv == 0) {
|
|
/* send frame to SGSN */
|
|
LOGP(DRLCMACUL, LOGL_INFO, "Complete UL frame for "
|
|
"TBF=%d that fits precisely in last block: "
|
|
"len=%d\n", tbf->tfi, tbf->llc_index);
|
|
gprs_rlcmac_tx_ul_ud(tbf);
|
|
tbf->llc_index = 0; /* reset frame space */
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct msgb *gprs_rlcmac_send_uplink_ack(struct gprs_rlcmac_tbf *tbf,
|
|
uint32_t fn)
|
|
{
|
|
int final = (tbf->state == GPRS_RLCMAC_FINISHED);
|
|
struct msgb *msg;
|
|
|
|
if (final && tbf->poll_state != GPRS_RLCMAC_POLL_NONE) {
|
|
LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already "
|
|
"sheduled for TBF=%d, so we must wait for final uplink "
|
|
"ack...\n", tbf->tfi);
|
|
return NULL;
|
|
}
|
|
|
|
msg = msgb_alloc(23, "rlcmac_ul_ack");
|
|
if (!msg)
|
|
return NULL;
|
|
bitvec *ack_vec = bitvec_alloc(23);
|
|
if (!ack_vec) {
|
|
msgb_free(msg);
|
|
return NULL;
|
|
}
|
|
bitvec_unhex(ack_vec,
|
|
"2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
|
|
RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)talloc_zero(tall_pcu_ctx, RlcMacDownlink_t);
|
|
write_packet_uplink_ack(mac_control_block, tbf, final);
|
|
encode_gsm_rlcmac_downlink(ack_vec, mac_control_block);
|
|
bitvec_pack(ack_vec, msgb_put(msg, 23));
|
|
bitvec_free(ack_vec);
|
|
talloc_free(mac_control_block);
|
|
|
|
/* now we must set this flag, so we are allowed to assign downlink
|
|
* TBF on PACCH. it is only allowed when TLLI is aknowledged. */
|
|
tbf->dir.ul.contention_resolution_done = 1;
|
|
|
|
if (final) {
|
|
tbf->poll_state = GPRS_RLCMAC_POLL_SCHED;
|
|
tbf->poll_fn = (fn + 13) % 2715648;
|
|
/* waiting for final acknowledge */
|
|
tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_WAIT_ACK;
|
|
tbf->dir.ul.final_ack_sent = 1;
|
|
} else
|
|
tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE;
|
|
|
|
return msg;
|
|
}
|
|
|
|
/* receive UL data block
|
|
*
|
|
* The blocks are defragmented and forwarded as LLC frames, if complete.
|
|
*/
|
|
int gprs_rlcmac_rcv_data_block_acknowledged(uint8_t trx, uint8_t ts,
|
|
uint8_t *data, uint8_t len)
|
|
{
|
|
struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
|
|
struct gprs_rlcmac_tbf *tbf;
|
|
struct rlc_ul_header *rh = (struct rlc_ul_header *)data;
|
|
uint16_t mod_sns, mod_sns_half, offset_v_q, offset_v_r, index;
|
|
int rc;
|
|
|
|
switch (len) {
|
|
case 54:
|
|
/* omitting spare bits */
|
|
len = 53;
|
|
break;
|
|
case 40:
|
|
/* omitting spare bits */
|
|
len = 39;
|
|
break;
|
|
case 34:
|
|
/* omitting spare bits */
|
|
len = 33;
|
|
break;
|
|
case 23:
|
|
break;
|
|
default:
|
|
LOGP(DRLCMACUL, LOGL_ERROR, "Dropping data block with invalid"
|
|
"length: %d)\n", len);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* find TBF inst from given TFI */
|
|
tbf = tbf_by_tfi(rh->tfi, trx, ts, GPRS_RLCMAC_UL_TBF);
|
|
if (!tbf) {
|
|
LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA unknown TBF=%d\n",
|
|
rh->tfi);
|
|
return 0;
|
|
}
|
|
tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_UL_DATA);
|
|
|
|
LOGP(DRLCMACUL, LOGL_DEBUG, "UL DATA TBF=%d received (V(Q)=%d .. "
|
|
"V(R)=%d)\n", rh->tfi, tbf->dir.ul.v_q, tbf->dir.ul.v_r);
|
|
|
|
/* get TLLI */
|
|
if (!tbf->tlli_valid) {
|
|
struct gprs_rlcmac_tbf *dl_tbf;
|
|
|
|
/* no TLLI yet */
|
|
if (!rh->ti) {
|
|
LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA TBF=%d without "
|
|
"TLLI, but no TLLI received yet\n", rh->tfi);
|
|
return 0;
|
|
}
|
|
rc = tlli_from_ul_data(data, len, &tbf->tlli);
|
|
if (rc) {
|
|
LOGP(DRLCMACUL, LOGL_NOTICE, "Failed to decode TLLI "
|
|
"of UL DATA TBF=%d.\n", rh->tfi);
|
|
return 0;
|
|
}
|
|
tbf->tlli_valid = 1;
|
|
LOGP(DRLCMACUL, LOGL_INFO, "Decoded premier TLLI=0x%08x of "
|
|
"UL DATA TBF=%d.\n", tbf->tlli, rh->tfi);
|
|
if ((dl_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_DL_TBF))) {
|
|
LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from "
|
|
"TLLI=0x%08x while DL TBF=%d still exists. "
|
|
"Killing pending DL TBF\n", tbf->tlli,
|
|
dl_tbf->tfi);
|
|
tbf_free(dl_tbf);
|
|
}
|
|
/* already have TLLI, but we stille get another one */
|
|
} else if (rh->ti) {
|
|
uint32_t tlli;
|
|
rc = tlli_from_ul_data(data, len, &tlli);
|
|
if (rc) {
|
|
LOGP(DRLCMACUL, LOGL_NOTICE, "Failed to decode TLLI "
|
|
"of UL DATA TBF=%d.\n", rh->tfi);
|
|
return 0;
|
|
}
|
|
if (tlli != tbf->tlli) {
|
|
LOGP(DRLCMACUL, LOGL_NOTICE, "TLLI mismatch on UL "
|
|
"DATA TBF=%d. (Ignoring due to contention "
|
|
"resolution)\n", rh->tfi);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
mod_sns = tbf->sns - 1;
|
|
mod_sns_half = (tbf->sns >> 1) - 1;
|
|
|
|
/* restart T3169 */
|
|
tbf_timer_start(tbf, 3169, bts->t3169, 0);
|
|
|
|
/* Increment RX-counter */
|
|
tbf->dir.ul.rx_counter++;
|
|
|
|
/* current block relative to lowest unreceived block */
|
|
offset_v_q = (rh->bsn - tbf->dir.ul.v_q) & mod_sns;
|
|
/* If out of window (may happen if blocks below V(Q) are received
|
|
* again. */
|
|
if (offset_v_q >= tbf->ws) {
|
|
LOGP(DRLCMACUL, LOGL_DEBUG, "- BSN %d out of window "
|
|
"%d..%d (it's normal)\n", rh->bsn, tbf->dir.ul.v_q,
|
|
(tbf->dir.ul.v_q + tbf->ws - 1) & mod_sns);
|
|
return 0;
|
|
}
|
|
/* Write block to buffer and set receive state array. */
|
|
index = rh->bsn & mod_sns_half; /* memory index of block */
|
|
memcpy(tbf->rlc_block[index], data, len); /* Copy block. */
|
|
tbf->rlc_block_len[index] = len;
|
|
tbf->dir.ul.v_n[index] = 'R'; /* Mark received block. */
|
|
LOGP(DRLCMACUL, LOGL_DEBUG, "- BSN %d storing in window (%d..%d)\n",
|
|
rh->bsn, tbf->dir.ul.v_q,
|
|
(tbf->dir.ul.v_q + tbf->ws - 1) & mod_sns);
|
|
/* Raise V(R) to highest received sequence number not received. */
|
|
offset_v_r = (rh->bsn + 1 - tbf->dir.ul.v_r) & mod_sns;
|
|
if (offset_v_r < (tbf->sns >> 1)) { /* Positive offset, so raise. */
|
|
while (offset_v_r--) {
|
|
if (offset_v_r) /* all except the received block */
|
|
tbf->dir.ul.v_n[tbf->dir.ul.v_r & mod_sns_half]
|
|
= 'N'; /* Mark block as not received */
|
|
tbf->dir.ul.v_r = (tbf->dir.ul.v_r + 1) & mod_sns;
|
|
/* Inc V(R). */
|
|
}
|
|
LOGP(DRLCMACUL, LOGL_DEBUG, "- Raising V(R) to %d\n",
|
|
tbf->dir.ul.v_r);
|
|
}
|
|
|
|
/* Raise V(Q) if possible, and retrieve LLC frames from blocks.
|
|
* This is looped until there is a gap (non received block) or
|
|
* the window is empty.*/
|
|
while (tbf->dir.ul.v_q != tbf->dir.ul.v_r && tbf->dir.ul.v_n[
|
|
(index = tbf->dir.ul.v_q & mod_sns_half)] == 'R') {
|
|
LOGP(DRLCMACUL, LOGL_DEBUG, "- Taking block %d out, raising "
|
|
"V(Q) to %d\n", tbf->dir.ul.v_q,
|
|
(tbf->dir.ul.v_q + 1) & mod_sns);
|
|
/* get LLC data from block */
|
|
gprs_rlcmac_assemble_llc(tbf, tbf->rlc_block[index],
|
|
tbf->rlc_block_len[index]);
|
|
/* raise V(Q), because block already received */
|
|
tbf->dir.ul.v_q = (tbf->dir.ul.v_q + 1) & mod_sns;
|
|
}
|
|
|
|
/* Check CV of last frame in buffer */
|
|
if (tbf->state == GPRS_RLCMAC_FLOW /* still in flow state */
|
|
&& tbf->dir.ul.v_q == tbf->dir.ul.v_r) { /* if complete */
|
|
struct rlc_ul_header *last_rh = (struct rlc_ul_header *)
|
|
tbf->rlc_block[(tbf->dir.ul.v_r - 1) & mod_sns_half];
|
|
LOGP(DRLCMACUL, LOGL_DEBUG, "- No gaps in received block, "
|
|
"last block: BSN=%d CV=%d\n", last_rh->bsn,
|
|
last_rh->cv);
|
|
if (last_rh->cv == 0) {
|
|
LOGP(DRLCMACUL, LOGL_DEBUG, "- Finished with UL "
|
|
"TBF\n");
|
|
tbf_new_state(tbf, GPRS_RLCMAC_FINISHED);
|
|
/* Reset N3103 counter. */
|
|
tbf->dir.ul.n3103 = 0;
|
|
}
|
|
}
|
|
|
|
/* If TLLI is included or if we received half of the window, we send
|
|
* an ack/nack */
|
|
if (rh->si || rh->ti || tbf->state == GPRS_RLCMAC_FINISHED
|
|
|| (tbf->dir.ul.rx_counter % SEND_ACK_AFTER_FRAMES) == 0) {
|
|
if (rh->si) {
|
|
LOGP(DRLCMACUL, LOGL_NOTICE, "- Scheduling Ack/Nack, "
|
|
"because MS is stalled.\n");
|
|
}
|
|
if (rh->ti) {
|
|
LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, "
|
|
"because TLLI is included.\n");
|
|
}
|
|
if (tbf->state == GPRS_RLCMAC_FINISHED) {
|
|
LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, "
|
|
"because last block has CV==0.\n");
|
|
}
|
|
if ((tbf->dir.ul.rx_counter % SEND_ACK_AFTER_FRAMES) == 0) {
|
|
LOGP(DRLCMACUL, LOGL_DEBUG, "- Scheduling Ack/Nack, "
|
|
"because %d frames received.\n",
|
|
SEND_ACK_AFTER_FRAMES);
|
|
}
|
|
if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_NONE) {
|
|
/* trigger sending at next RTS */
|
|
tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_SEND_ACK;
|
|
} else {
|
|
/* already triggered */
|
|
LOGP(DRLCMACUL, LOGL_DEBUG, "- Sending Ack/Nack is "
|
|
"already triggered, don't schedule!\n");
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct msgb *gprs_rlcmac_send_packet_uplink_assignment(
|
|
struct gprs_rlcmac_tbf *tbf, uint32_t fn)
|
|
{
|
|
struct msgb *msg;
|
|
struct gprs_rlcmac_tbf *new_tbf;
|
|
|
|
#if POLLING_ASSIGNMENT_UL == 1
|
|
if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) {
|
|
LOGP(DRLCMACUL, LOGL_DEBUG, "Polling is already "
|
|
"sheduled for TBF=%d, so we must wait for uplink "
|
|
"assignment...\n", tbf->tfi);
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
/* on down TBF we get the uplink TBF to be assigned. */
|
|
if (tbf->direction == GPRS_RLCMAC_DL_TBF)
|
|
new_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_UL_TBF);
|
|
else
|
|
new_tbf = tbf;
|
|
|
|
if (!new_tbf) {
|
|
LOGP(DRLCMACUL, LOGL_ERROR, "We have a schedule for uplink "
|
|
"assignment at downlink TBF=%d, but there is no uplink "
|
|
"TBF\n", tbf->tfi);
|
|
tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE;
|
|
return NULL;
|
|
}
|
|
|
|
msg = msgb_alloc(23, "rlcmac_ul_ass");
|
|
if (!msg)
|
|
return NULL;
|
|
LOGP(DRLCMAC, LOGL_INFO, "TBF: START TFI: %u TLLI: 0x%08x Packet Uplink Assignment (PACCH)\n", new_tbf->tfi, new_tbf->tlli);
|
|
bitvec *ass_vec = bitvec_alloc(23);
|
|
if (!ass_vec) {
|
|
msgb_free(msg);
|
|
return NULL;
|
|
}
|
|
bitvec_unhex(ass_vec,
|
|
"2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
|
|
write_packet_uplink_assignment(ass_vec, tbf->tfi,
|
|
(tbf->direction == GPRS_RLCMAC_DL_TBF), 0, 0, new_tbf,
|
|
POLLING_ASSIGNMENT_UL);
|
|
bitvec_pack(ass_vec, msgb_put(msg, 23));
|
|
RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)talloc_zero(tall_pcu_ctx, RlcMacDownlink_t);
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ TX : Packet Uplink Assignment +++++++++++++++++++++++++\n");
|
|
decode_gsm_rlcmac_downlink(ass_vec, mac_control_block);
|
|
LOGPC(DCSN1, LOGL_NOTICE, "\n");
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- TX : Packet Uplink Assignment -------------------------\n");
|
|
bitvec_free(ass_vec);
|
|
talloc_free(mac_control_block);
|
|
|
|
#if POLLING_ASSIGNMENT_UL == 1
|
|
tbf->poll_state = GPRS_RLCMAC_POLL_SCHED;
|
|
tbf->poll_fn = (fn + 13) % 2715648;
|
|
tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_WAIT_ACK;
|
|
#else
|
|
tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE;
|
|
tbf_new_state(new_tbf, GPRS_RLCMAC_FLOW);
|
|
tbf_assign_control_ts(new_tbf);
|
|
#endif
|
|
|
|
return msg;
|
|
}
|
|
|
|
int gprs_rlcmac_rcv_rach(uint8_t ra, uint32_t Fn, int16_t qta)
|
|
{
|
|
struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
|
|
struct gprs_rlcmac_tbf *tbf;
|
|
uint8_t trx, ts;
|
|
int8_t tfi; /* must be signed */
|
|
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF on RACH, so we provide "
|
|
"one:\n");
|
|
// Create new TBF
|
|
tfi = tfi_alloc(GPRS_RLCMAC_UL_TBF, &trx, &ts, -1, -1);
|
|
if (tfi < 0) {
|
|
LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n");
|
|
/* FIXME: send reject */
|
|
return -EBUSY;
|
|
}
|
|
/* set class to 0, since we don't know the multislot class yet */
|
|
tbf = tbf_alloc(NULL, GPRS_RLCMAC_UL_TBF, tfi, trx, ts, 0, 1);
|
|
if (!tbf) {
|
|
LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n");
|
|
/* FIXME: send reject */
|
|
return -EBUSY;
|
|
}
|
|
if (qta < 0)
|
|
qta = 0;
|
|
if (qta > 252)
|
|
qta = 252;
|
|
tbf->ta = qta >> 2;
|
|
tbf_new_state(tbf, GPRS_RLCMAC_FLOW);
|
|
tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_CCCH);
|
|
tbf_timer_start(tbf, 3169, bts->t3169, 0);
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [UPLINK] START TFI: %u\n", tbf->tfi);
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] TFI: %u RACH qbit-ta=%d ra=%d, Fn=%d (%d,%d,%d)\n", tbf->tfi, qta, ra, Fn, (Fn / (26 * 51)) % 32, Fn % 51, Fn % 26);
|
|
LOGP(DRLCMAC, LOGL_INFO, "TX: START TFI: %u Immediate Assignment Uplink (AGCH)\n", tbf->tfi);
|
|
bitvec *immediate_assignment = bitvec_alloc(22) /* without plen */;
|
|
bitvec_unhex(immediate_assignment, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
|
|
int plen = write_immediate_assignment(immediate_assignment, 0, ra, Fn, tbf->ta, tbf->arfcn, tbf->first_ts, tbf->tsc, tbf->tfi, tbf->dir.ul.usf[tbf->first_ts], 0, 0, 0);
|
|
pcu_l1if_tx_agch(immediate_assignment, plen);
|
|
bitvec_free(immediate_assignment);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* DL data block flow
|
|
*/
|
|
|
|
static struct msgb *llc_dequeue(struct gprs_rlcmac_tbf *tbf)
|
|
{
|
|
struct msgb *msg;
|
|
struct timeval *tv, tv_now;
|
|
uint32_t octets = 0, frames = 0;
|
|
|
|
gettimeofday(&tv_now, NULL);
|
|
|
|
while ((msg = msgb_dequeue(&tbf->llc_queue))) {
|
|
tv = (struct timeval *)msg->data;
|
|
msgb_pull(msg, sizeof(*tv));
|
|
if (tv->tv_sec /* not infinite */
|
|
&& (tv_now.tv_sec > tv->tv_sec /* and secs expired */
|
|
|| (tv_now.tv_sec == tv->tv_sec /* .. or if secs equal .. */
|
|
&& tv_now.tv_usec > tv->tv_usec))) { /* .. usecs expired */
|
|
LOGP(DRLCMACDL, LOGL_NOTICE, "Discarding LLC PDU of "
|
|
"DL TBF=%d, because lifetime limit reached\n",
|
|
tbf->tfi);
|
|
frames++;
|
|
octets += msg->len;
|
|
msgb_free(msg);
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (frames) {
|
|
if (frames > 0xff)
|
|
frames = 0xff;
|
|
if (octets > 0xffffff)
|
|
octets = 0xffffff;
|
|
bssgp_tx_llc_discarded(bctx, tbf->tlli, frames, octets);
|
|
}
|
|
|
|
return msg;
|
|
}
|
|
|
|
static int gprs_rlcmac_debug_bw(struct gprs_rlcmac_tbf *tbf, uint16_t octets)
|
|
{
|
|
struct timeval now_tv, *bw_tv = &tbf->bw_tv;
|
|
uint32_t elapsed;
|
|
|
|
tbf->bw_octets += octets;
|
|
|
|
gettimeofday(&now_tv, NULL);
|
|
elapsed = ((now_tv.tv_sec - bw_tv->tv_sec) << 7)
|
|
+ ((now_tv.tv_usec - bw_tv->tv_usec) << 7) / 1000000;
|
|
if (elapsed < 128)
|
|
return 0;
|
|
|
|
LOGP(DRLCMACBW, LOGL_DEBUG, "DL Bandwitdh of TLLI=0x%08x: %d KBits/s\n",
|
|
tbf->tlli, tbf->bw_octets / elapsed);
|
|
|
|
/* reset bandwidth values timestamp */
|
|
memcpy(bw_tv, &now_tv, sizeof(struct timeval));
|
|
tbf->bw_octets = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* send DL data block
|
|
*
|
|
* The messages are fragmented and forwarded as data blocks.
|
|
*/
|
|
struct msgb *gprs_rlcmac_send_data_block_acknowledged(
|
|
struct gprs_rlcmac_tbf *tbf, uint32_t fn, uint8_t ts)
|
|
{
|
|
struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
|
|
struct rlc_dl_header *rh;
|
|
struct rlc_li_field *li;
|
|
uint8_t block_length; /* total length of block, including spare bits */
|
|
uint8_t block_data; /* usable data of block, w/o spare bits, inc. MAC */
|
|
struct msgb *msg, *dl_msg;
|
|
uint8_t bsn;
|
|
uint16_t mod_sns = tbf->sns - 1;
|
|
uint16_t mod_sns_half = (tbf->sns >> 1) - 1;
|
|
uint16_t index;
|
|
uint8_t *delimiter, *data, *e_pointer;
|
|
uint8_t len;
|
|
uint16_t space, chunk;
|
|
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "DL DATA TBF=%d downlink (V(A)==%d .. "
|
|
"V(S)==%d)\n", tbf->tfi, tbf->dir.dl.v_a, tbf->dir.dl.v_s);
|
|
|
|
do_resend:
|
|
/* check if there is a block with negative acknowledgement */
|
|
for (bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s;
|
|
bsn = (bsn + 1) & mod_sns) {
|
|
index = (bsn & mod_sns_half);
|
|
if (tbf->dir.dl.v_b[index] == 'N'
|
|
|| tbf->dir.dl.v_b[index] == 'X') {
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "- Resending BSN %d\n",
|
|
bsn);
|
|
/* re-send block with negative aknowlegement */
|
|
tbf->dir.dl.v_b[index] = 'U'; /* unacked */
|
|
goto tx_block;
|
|
}
|
|
}
|
|
|
|
/* if the window has stalled, or transfer is complete,
|
|
* send an unacknowledged block */
|
|
if (tbf->state == GPRS_RLCMAC_FINISHED
|
|
|| ((tbf->dir.dl.v_s - tbf->dir.dl.v_a) & mod_sns) == tbf->ws) {
|
|
int resend = 0;
|
|
|
|
if (tbf->state == GPRS_RLCMAC_FINISHED)
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "- Restarting at BSN %d, "
|
|
"because all blocks have been transmitted.\n",
|
|
tbf->dir.dl.v_a);
|
|
else
|
|
LOGP(DRLCMACDL, LOGL_NOTICE, "- Restarting at BSN %d, "
|
|
"because all window is stalled.\n",
|
|
tbf->dir.dl.v_a);
|
|
/* If V(S) == V(A) and finished state, we would have received
|
|
* acknowledgement of all transmitted block. In this case we
|
|
* would have transmitted the final block, and received ack
|
|
* from MS. But in this case we did not receive the final ack
|
|
* indication from MS. This should never happen if MS works
|
|
* correctly. */
|
|
if (tbf->dir.dl.v_s == tbf->dir.dl.v_a) {
|
|
LOGP(DRLCMACDL, LOGL_ERROR, "- MS acked all block, "
|
|
"but we still transmitting!\n");
|
|
/* we just send final block again */
|
|
index = ((tbf->dir.dl.v_s - 1) & mod_sns_half);
|
|
goto tx_block;
|
|
}
|
|
|
|
/* cycle through all unacked blocks */
|
|
for (bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s;
|
|
bsn = (bsn + 1) & mod_sns) {
|
|
index = (bsn & mod_sns_half);
|
|
if (tbf->dir.dl.v_b[index] == 'U') {
|
|
/* mark to be re-send */
|
|
tbf->dir.dl.v_b[index] = 'X';
|
|
resend++;
|
|
}
|
|
}
|
|
/* At this point there should be at leasst one unacked block
|
|
* to be resent. If not, this is an software error. */
|
|
if (resend == 0) {
|
|
LOGP(DRLCMACDL, LOGL_ERROR, "Software error: "
|
|
"There are no unacknowledged blocks, but V(A) "
|
|
" != V(S). PLEASE FIX!\n");
|
|
/* we just send final block again */
|
|
index = ((tbf->dir.dl.v_s - 1) & mod_sns_half);
|
|
goto tx_block;
|
|
}
|
|
goto do_resend;
|
|
}
|
|
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "- Sending new block at BSN %d\n",
|
|
tbf->dir.dl.v_s);
|
|
|
|
/* now we still have untransmitted LLC data, so we fill mac block */
|
|
index = tbf->dir.dl.v_s & mod_sns_half;
|
|
data = tbf->rlc_block[index];
|
|
switch (bts->initial_cs) {
|
|
case 2: /* CS-2 */
|
|
block_length = 34;
|
|
block_data = 33;
|
|
break;
|
|
case 3: /* CS-3 */
|
|
block_length = 40;
|
|
block_data = 39;
|
|
break;
|
|
case 4: /* CS-4 */
|
|
block_length = 54;
|
|
block_data = 53;
|
|
break;
|
|
default: /* CS-1 */
|
|
block_length = 23;
|
|
block_data = 23;
|
|
}
|
|
memset(data, 0x2b, block_data); /* spare bits will be left 0 */
|
|
rh = (struct rlc_dl_header *)data;
|
|
rh->pt = 0; /* Data Block */
|
|
rh->rrbp = rh->s_p = 0; /* Polling, set later, if required */
|
|
rh->usf = 7; /* will be set at scheduler */
|
|
rh->pr = 0; /* FIXME: power reduction */
|
|
rh->tfi = tbf->tfi; /* TFI */
|
|
rh->fbi = 0; /* Final Block Indicator, set late, if true */
|
|
rh->bsn = tbf->dir.dl.v_s; /* Block Sequence Number */
|
|
rh->e = 0; /* Extension bit, maybe set later */
|
|
e_pointer = data + 2; /* points to E of current chunk */
|
|
data += 3;
|
|
delimiter = data; /* where next length header would be stored */
|
|
space = block_data - 3;
|
|
while (1) {
|
|
chunk = tbf->llc_length - tbf->llc_index;
|
|
/* if chunk will exceed block limit */
|
|
if (chunk > space) {
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d "
|
|
"larger than space (%d) left in block: copy "
|
|
"only remaining space, and we are done\n",
|
|
chunk, space);
|
|
/* block is filled, so there is no extension */
|
|
*e_pointer |= 0x01;
|
|
/* fill only space */
|
|
memcpy(data, tbf->llc_frame + tbf->llc_index, space);
|
|
/* incement index */
|
|
tbf->llc_index += space;
|
|
/* return data block as message */
|
|
break;
|
|
}
|
|
/* if FINAL chunk would fit precisely in space left */
|
|
if (chunk == space && llist_empty(&tbf->llc_queue)) {
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d "
|
|
"would exactly fit into space (%d): because "
|
|
"this is a final block, we don't add length "
|
|
"header, and we are done\n", chunk, space);
|
|
LOGP(DRLCMACDL, LOGL_INFO, "Complete DL frame for "
|
|
"TBF=%d that fits precisely in last block: "
|
|
"len=%d\n", tbf->tfi, tbf->llc_length);
|
|
gprs_rlcmac_debug_bw(tbf, tbf->llc_length);
|
|
/* block is filled, so there is no extension */
|
|
*e_pointer |= 0x01;
|
|
/* fill space */
|
|
memcpy(data, tbf->llc_frame + tbf->llc_index, space);
|
|
/* reset LLC frame */
|
|
tbf->llc_index = tbf->llc_length = 0;
|
|
/* final block */
|
|
rh->fbi = 1; /* we indicate final block */
|
|
tbf_new_state(tbf, GPRS_RLCMAC_FINISHED);
|
|
/* return data block as message */
|
|
break;
|
|
}
|
|
/* if chunk would fit exactly in space left */
|
|
if (chunk == space) {
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d "
|
|
"would exactly fit into space (%d): add length "
|
|
"header with LI=0, to make frame extend to "
|
|
"next block, and we are done\n", chunk, space);
|
|
/* make space for delimiter */
|
|
if (delimiter != data)
|
|
memcpy(delimiter + 1, delimiter,
|
|
data - delimiter);
|
|
data++;
|
|
space--;
|
|
/* add LI with 0 length */
|
|
li = (struct rlc_li_field *)delimiter;
|
|
li->e = 1; /* not more extension */
|
|
li->m = 0; /* shall be set to 0, in case of li = 0 */
|
|
li->li = 0; /* chunk fills the complete space */
|
|
// no need to set e_pointer nor increase delimiter
|
|
/* fill only space, which is 1 octet less than chunk */
|
|
memcpy(data, tbf->llc_frame + tbf->llc_index, space);
|
|
/* incement index */
|
|
tbf->llc_index += space;
|
|
/* return data block as message */
|
|
break;
|
|
}
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "-- Chunk with length %d is less "
|
|
"than remaining space (%d): add length header to "
|
|
"to delimit LLC frame\n", chunk, space);
|
|
/* the LLC frame chunk ends in this block */
|
|
/* make space for delimiter */
|
|
if (delimiter != data)
|
|
memcpy(delimiter + 1, delimiter, data - delimiter);
|
|
data++;
|
|
space--;
|
|
/* add LI to delimit frame */
|
|
li = (struct rlc_li_field *)delimiter;
|
|
li->e = 0; /* Extension bit, maybe set later */
|
|
li->m = 0; /* will be set later, if there is more LLC data */
|
|
li->li = chunk; /* length of chunk */
|
|
e_pointer = delimiter; /* points to E of current delimiter */
|
|
delimiter++;
|
|
/* copy (rest of) LLC frame to space */
|
|
memcpy(data, tbf->llc_frame + tbf->llc_index, chunk);
|
|
data += chunk;
|
|
space -= chunk;
|
|
LOGP(DRLCMACDL, LOGL_INFO, "Complete DL frame for TBF=%d: "
|
|
"len=%d\n", tbf->tfi, tbf->llc_length);
|
|
gprs_rlcmac_debug_bw(tbf, tbf->llc_length);
|
|
/* reset LLC frame */
|
|
tbf->llc_index = tbf->llc_length = 0;
|
|
/* dequeue next LLC frame, if any */
|
|
msg = llc_dequeue(tbf);
|
|
if (msg) {
|
|
LOGP(DRLCMACDL, LOGL_INFO, "- Dequeue next LLC for "
|
|
"TBF=%d (len=%d)\n", tbf->tfi, msg->len);
|
|
memcpy(tbf->llc_frame, msg->data, msg->len);
|
|
tbf->llc_length = msg->len;
|
|
msgb_free(msg);
|
|
}
|
|
/* if we have more data and we have space left */
|
|
if (space > 0 && tbf->llc_length) {
|
|
li->m = 1; /* we indicate more frames to follow */
|
|
continue;
|
|
}
|
|
/* if we don't have more LLC frames */
|
|
if (!tbf->llc_length) {
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "-- Final block, so we "
|
|
"done.\n");
|
|
li->e = 1; /* we cannot extend */
|
|
rh->fbi = 1; /* we indicate final block */
|
|
tbf->dir.dl.tx_counter = POLL_ACK_AFTER_FRAMES + 1;
|
|
/* + 1 indicates: first final ack */
|
|
tbf_new_state(tbf, GPRS_RLCMAC_FINISHED);
|
|
break;
|
|
}
|
|
/* we have no space left */
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "-- No space left, so we are "
|
|
"done.\n");
|
|
li->e = 1; /* we cannot extend */
|
|
break;
|
|
}
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "data block: %s\n",
|
|
osmo_hexdump(tbf->rlc_block[index], block_length));
|
|
tbf->rlc_block_len[index] = block_length;
|
|
/* raise send state and set ack state array */
|
|
tbf->dir.dl.v_b[index] = 'U'; /* unacked */
|
|
tbf->dir.dl.v_s = (tbf->dir.dl.v_s + 1) & mod_sns; /* inc send state */
|
|
|
|
tx_block:
|
|
/* from this point on, new block is sent or old block is resent */
|
|
|
|
/* get data and header from current block */
|
|
data = tbf->rlc_block[index];
|
|
len = tbf->rlc_block_len[index];
|
|
rh = (struct rlc_dl_header *)data;
|
|
|
|
/* Clear Polling, if still set in history buffer */
|
|
rh->s_p = 0;
|
|
|
|
/* poll after POLL_ACK_AFTER_FRAMES frames, or when final block is tx.
|
|
*/
|
|
if (tbf->dir.dl.tx_counter >= POLL_ACK_AFTER_FRAMES) {
|
|
if (tbf->dir.dl.tx_counter > POLL_ACK_AFTER_FRAMES) {
|
|
/* if rx_counter is POLL_ACK_AFTER_FRAMES + 1, this
|
|
* indicates: poll caused by final ack. */
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack "
|
|
"polling, because final block sent.\n");
|
|
} else {
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "- Scheduling Ack/Nack "
|
|
"polling, because %d blocks sent.\n",
|
|
POLL_ACK_AFTER_FRAMES);
|
|
}
|
|
tbf->dir.dl.tx_counter = 0;
|
|
/* scheduling not possible, because: */
|
|
if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE)
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "Polling is already "
|
|
"sheduled for TBF=%d, so we must wait for "
|
|
"requesting downlink ack\n", tbf->tfi);
|
|
else if (tbf->control_ts != ts)
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "Polling cannot be "
|
|
"sheduled in this TS %d, waiting for "
|
|
"TS %d\n", ts, tbf->control_ts);
|
|
else {
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "Polling sheduled in this "
|
|
"TS %d\n", ts);
|
|
/* start timer whenever we send the final block */
|
|
if (rh->fbi == 1)
|
|
tbf_timer_start(tbf, 3191, bts->t3191, 0);
|
|
|
|
/* schedule polling */
|
|
tbf->poll_state = GPRS_RLCMAC_POLL_SCHED;
|
|
tbf->poll_fn = (fn + 13) % 2715648;
|
|
|
|
/* set polling in header */
|
|
rh->rrbp = 0; /* N+13 */
|
|
rh->s_p = 1; /* Polling */
|
|
|
|
/* Increment TX-counter */
|
|
tbf->dir.dl.tx_counter++;
|
|
}
|
|
} else {
|
|
/* Increment TX-counter */
|
|
tbf->dir.dl.tx_counter++;
|
|
}
|
|
|
|
/* return data block as message */
|
|
dl_msg = msgb_alloc(len, "rlcmac_dl_data");
|
|
if (!dl_msg)
|
|
return NULL;
|
|
memcpy(msgb_put(dl_msg, len), data, len);
|
|
|
|
return dl_msg;
|
|
}
|
|
|
|
int gprs_rlcmac_downlink_ack(struct gprs_rlcmac_tbf *tbf, uint8_t final,
|
|
uint8_t ssn, uint8_t *rbb)
|
|
{
|
|
char show_rbb[65], show_v_b[RLC_MAX_SNS + 1];
|
|
uint16_t mod_sns = tbf->sns - 1;
|
|
uint16_t mod_sns_half = (tbf->sns >> 1) - 1;
|
|
int i; /* must be signed */
|
|
int16_t dist; /* must be signed */
|
|
uint8_t bit;
|
|
uint16_t bsn;
|
|
struct msgb *msg;
|
|
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "TBF=%d downlink acknowledge\n",
|
|
tbf->tfi);
|
|
|
|
if (!final) {
|
|
/* show received array in debug (bit 64..1) */
|
|
for (i = 63; i >= 0; i--) {
|
|
bit = (rbb[i >> 3] >> (7 - (i&7))) & 1;
|
|
show_rbb[i] = (bit) ? '1' : 'o';
|
|
}
|
|
show_rbb[64] = '\0';
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "- ack: (BSN=%d)\"%s\""
|
|
"(BSN=%d) 1=ACK o=NACK\n", (ssn - 64) & mod_sns,
|
|
show_rbb, (ssn - 1) & mod_sns);
|
|
|
|
/* apply received array to receive state (SSN-64..SSN-1) */
|
|
/* calculate distance of ssn from V(S) */
|
|
dist = (tbf->dir.dl.v_s - ssn) & mod_sns;
|
|
/* check if distance is less than distance V(A)..V(S) */
|
|
if (dist < ((tbf->dir.dl.v_s - tbf->dir.dl.v_a) & mod_sns)) {
|
|
/* SSN - 1 is in range V(A)..V(S)-1 */
|
|
for (i = 63, bsn = (ssn - 1) & mod_sns;
|
|
i >= 0 && bsn != ((tbf->dir.dl.v_a - 1) & mod_sns);
|
|
i--, bsn = (bsn - 1) & mod_sns) {
|
|
bit = (rbb[i >> 3] >> (7 - (i&7))) & 1;
|
|
if (bit) {
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "- got "
|
|
"ack for BSN=%d\n", bsn);
|
|
tbf->dir.dl.v_b[bsn & mod_sns_half]
|
|
= 'A';
|
|
} else {
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "- got "
|
|
"NACK for BSN=%d\n", bsn);
|
|
tbf->dir.dl.v_b[bsn & mod_sns_half]
|
|
= 'N';
|
|
}
|
|
}
|
|
} else {
|
|
/* this might happpen, if the downlink assignment
|
|
* was not received by ms and the ack refers
|
|
* to previous TBF
|
|
* FIXME: we should implement polling for
|
|
* control ack!*/
|
|
LOGP(DRLCMACDL, LOGL_NOTICE, "- ack range is out of "
|
|
"V(A)..V(S) range (DL TBF=%d) Free TFB!\n",
|
|
tbf->tfi);
|
|
return 1; /* indicate to free TBF */
|
|
}
|
|
|
|
/* raise V(A), if possible */
|
|
for (i = 0, bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s;
|
|
i++, bsn = (bsn + 1) & mod_sns) {
|
|
if (tbf->dir.dl.v_b[bsn & mod_sns_half] == 'A') {
|
|
tbf->dir.dl.v_b[bsn & mod_sns_half] = 'I';
|
|
/* mark invalid */
|
|
tbf->dir.dl.v_a = (tbf->dir.dl.v_a + 1)
|
|
& mod_sns;
|
|
} else
|
|
break;
|
|
}
|
|
|
|
/* show receive state array in debug (V(A)..V(S)-1) */
|
|
for (i = 0, bsn = tbf->dir.dl.v_a; bsn != tbf->dir.dl.v_s;
|
|
i++, bsn = (bsn + 1) & mod_sns) {
|
|
show_v_b[i] = tbf->dir.dl.v_b[bsn & mod_sns_half];
|
|
if (show_v_b[i] == 0)
|
|
show_v_b[i] = ' ';
|
|
}
|
|
show_v_b[i] = '\0';
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "- V(B): (V(A)=%d)\"%s\""
|
|
"(V(S)-1=%d) A=Acked N=Nacked U=Unacked "
|
|
"X=Resend-Unacked\n", tbf->dir.dl.v_a, show_v_b,
|
|
(tbf->dir.dl.v_s - 1) & mod_sns);
|
|
|
|
if (tbf->state == GPRS_RLCMAC_FINISHED
|
|
&& tbf->dir.dl.v_s == tbf->dir.dl.v_a) {
|
|
LOGP(DRLCMACDL, LOGL_NOTICE, "Received final block, "
|
|
"but without final ack inidcation\n");
|
|
} else
|
|
return 0;
|
|
} else
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "- Final ACK received.\n");
|
|
|
|
/* check for LLC PDU in the LLC Queue */
|
|
msg = llc_dequeue(tbf);
|
|
if (!msg) {
|
|
struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts;
|
|
|
|
/* no message, start T3193, change state to RELEASE */
|
|
LOGP(DRLCMACDL, LOGL_DEBUG, "- No new message, so we "
|
|
"release.\n");
|
|
/* start T3193 */
|
|
tbf_timer_start(tbf, 3193, bts->t3193_msec / 1000,
|
|
bts->t3193_msec & 1000);
|
|
tbf_new_state(tbf, GPRS_RLCMAC_WAIT_RELEASE);
|
|
|
|
return 0;
|
|
}
|
|
memcpy(tbf->llc_frame, msg->data, msg->len);
|
|
tbf->llc_length = msg->len;
|
|
msgb_free(msg);
|
|
|
|
/* we have a message, so we trigger downlink assignment, and there
|
|
* set the state to ASSIGN. also we set old_downlink, because we
|
|
* re-use this tbf. */
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "Trigger dowlink assignment on PACCH, "
|
|
"because another LLC PDU has arrived in between\n");
|
|
memset(&tbf->dir.dl, 0, sizeof(tbf->dir.dl)); /* reset RLC states */
|
|
tbf->state_flags = 0;
|
|
tbf_update(tbf);
|
|
gprs_rlcmac_trigger_downlink_assignment(tbf, tbf, NULL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
struct msgb *gprs_rlcmac_send_packet_downlink_assignment(
|
|
struct gprs_rlcmac_tbf *tbf, uint32_t fn)
|
|
{
|
|
struct msgb *msg;
|
|
struct gprs_rlcmac_tbf *new_tbf;
|
|
int poll_ass_dl = POLLING_ASSIGNMENT_DL;
|
|
|
|
if (poll_ass_dl && tbf->direction == GPRS_RLCMAC_DL_TBF
|
|
&& tbf->control_ts != tbf->first_common_ts) {
|
|
LOGP(DRLCMAC, LOGL_NOTICE, "Cannot poll for downlink "
|
|
"assigment, because MS cannot reply.\n");
|
|
poll_ass_dl = 0;
|
|
}
|
|
if (poll_ass_dl) {
|
|
if (tbf->poll_state != GPRS_RLCMAC_POLL_NONE) {
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "Polling is already sheduled "
|
|
"for TBF=%d, so we must wait for downlink "
|
|
"assignment...\n", tbf->tfi);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/* on uplink TBF we get the downlink TBF to be assigned. */
|
|
if (tbf->direction == GPRS_RLCMAC_UL_TBF) {
|
|
/* be sure to check first, if contention resolution is done,
|
|
* otherwise we cannot send the assignment yet */
|
|
if (!tbf->dir.ul.contention_resolution_done) {
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "Cannot assign DL TBF now, "
|
|
"because contention resolution is not "
|
|
"finished.\n");
|
|
return NULL;
|
|
}
|
|
new_tbf = tbf_by_tlli(tbf->tlli, GPRS_RLCMAC_DL_TBF);
|
|
} else
|
|
new_tbf = tbf;
|
|
if (!new_tbf) {
|
|
LOGP(DRLCMACDL, LOGL_ERROR, "We have a schedule for downlink "
|
|
"assignment at uplink TBF=%d, but there is no downlink "
|
|
"TBF\n", tbf->tfi);
|
|
tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE;
|
|
return NULL;
|
|
}
|
|
|
|
msg = msgb_alloc(23, "rlcmac_dl_ass");
|
|
if (!msg)
|
|
return NULL;
|
|
bitvec *ass_vec = bitvec_alloc(23);
|
|
if (!ass_vec) {
|
|
msgb_free(msg);
|
|
return NULL;
|
|
}
|
|
bitvec_unhex(ass_vec,
|
|
"2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
|
|
LOGP(DRLCMAC, LOGL_INFO, "TBF: START TFI: %u TLLI: 0x%08x Packet Downlink Assignment (PACCH)\n", new_tbf->tfi, new_tbf->tlli);
|
|
RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)talloc_zero(tall_pcu_ctx, RlcMacDownlink_t);
|
|
write_packet_downlink_assignment(mac_control_block, tbf->tfi,
|
|
(tbf->direction == GPRS_RLCMAC_DL_TBF), new_tbf,
|
|
poll_ass_dl);
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ TX : Packet Downlink Assignment +++++++++++++++++++++++++\n");
|
|
encode_gsm_rlcmac_downlink(ass_vec, mac_control_block);
|
|
LOGPC(DCSN1, LOGL_NOTICE, "\n");
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- TX : Packet Downlink Assignment -------------------------\n");
|
|
bitvec_pack(ass_vec, msgb_put(msg, 23));
|
|
bitvec_free(ass_vec);
|
|
talloc_free(mac_control_block);
|
|
|
|
if (poll_ass_dl) {
|
|
tbf->poll_state = GPRS_RLCMAC_POLL_SCHED;
|
|
tbf->poll_fn = (fn + 13) % 2715648;
|
|
tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_WAIT_ACK;
|
|
} else {
|
|
tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE;
|
|
tbf_new_state(new_tbf, GPRS_RLCMAC_FLOW);
|
|
tbf_assign_control_ts(new_tbf);
|
|
}
|
|
|
|
return msg;
|
|
}
|
|
|
|
static void gprs_rlcmac_downlink_assignment(gprs_rlcmac_tbf *tbf, uint8_t poll,
|
|
char *imsi)
|
|
{
|
|
LOGP(DRLCMAC, LOGL_INFO, "TX: START TFI: %u TLLI: 0x%08x Immediate Assignment Downlink (PCH)\n", tbf->tfi, tbf->tlli);
|
|
bitvec *immediate_assignment = bitvec_alloc(22); /* without plen */
|
|
bitvec_unhex(immediate_assignment, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
|
|
/* use request reference that has maximum distance to current time,
|
|
* so the assignment will not conflict with possible RACH requests. */
|
|
int plen = write_immediate_assignment(immediate_assignment, 1, 125, (tbf->pdch[tbf->first_ts]->last_rts_fn + 21216) % 2715648, tbf->ta, tbf->arfcn, tbf->first_ts, tbf->tsc, tbf->tfi, 0, tbf->tlli, poll, tbf->poll_fn);
|
|
pcu_l1if_tx_pch(immediate_assignment, plen, imsi);
|
|
bitvec_free(immediate_assignment);
|
|
}
|
|
|
|
/* depending on the current TBF, we assign on PACCH or AGCH */
|
|
void gprs_rlcmac_trigger_downlink_assignment(struct gprs_rlcmac_tbf *tbf,
|
|
struct gprs_rlcmac_tbf *old_tbf, char *imsi)
|
|
{
|
|
#ifdef DEBUG_DL_ASS_IDLE
|
|
strncpy(debug_imsi, imsi);
|
|
LOGP(DRLCMAC, LOGL_ERROR, "**** DEBUGGING DOWNLINK ASSIGNMENT ****\n");
|
|
#endif
|
|
|
|
/* stop pending timer */
|
|
tbf_timer_stop(tbf);
|
|
|
|
/* check for downlink tbf: */
|
|
if (old_tbf) {
|
|
#ifdef DEBUG_DL_ASS_IDLE
|
|
LOGP(DRLCMAC, LOGL_ERROR, "We must wait for current TBF to be "
|
|
"released.\n");
|
|
/* wait one second until assignment */
|
|
tbf_timer_start(tbf, 1234, 1,0);
|
|
#else
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "Send dowlink assignment on "
|
|
"PACCH, because %s TBF=%d exists for TLLI=0x%08x\n",
|
|
(old_tbf->direction == GPRS_RLCMAC_UL_TBF)
|
|
? "UL" : "DL", old_tbf->tfi, old_tbf->tlli);
|
|
old_tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_SEND_ASS;
|
|
/* use TA from old TBF */
|
|
tbf->ta = old_tbf->ta;
|
|
/* change state */
|
|
tbf_new_state(tbf, GPRS_RLCMAC_ASSIGN);
|
|
tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_PACCH);
|
|
#endif
|
|
} else {
|
|
LOGP(DRLCMAC, LOGL_DEBUG, "Send dowlink assignment for TBF=%d on PCH, no TBF exist (IMSI=%s)\n", tbf->tfi, imsi);
|
|
if (!imsi || strlen(imsi) < 3) {
|
|
LOGP(DRLCMAC, LOGL_ERROR, "No valid IMSI!\n");
|
|
return;
|
|
}
|
|
/* change state */
|
|
tbf_new_state(tbf, GPRS_RLCMAC_ASSIGN);
|
|
tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_CCCH);
|
|
/* send immediate assignment */
|
|
gprs_rlcmac_downlink_assignment(tbf, 0, imsi);
|
|
/* send immediate assignment */
|
|
gprs_rlcmac_downlink_assignment(tbf, 0, imsi);
|
|
/* start timer */
|
|
tbf_timer_start(tbf, 0, Tassign_agch);
|
|
}
|
|
}
|
|
|