| /* gprs_rlcmac.cpp |
| * |
| * Copyright (C) 2012 Ivan Klyuchnikov |
| * Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu> |
| * Copyright (C) 2013 by Holger Hans Peter Freyther |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version 2 |
| * of the License, or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| */ |
| |
| #include <gprs_bssgp_pcu.h> |
| #include <pcu_l1_if.h> |
| #include <gprs_rlcmac.h> |
| #include <tbf.h> |
| |
| |
| struct gprs_rlcmac_cs gprs_rlcmac_cs[] = { |
| /* frame length data block max payload */ |
| { 0, 0, 0 }, |
| { 23, 23, 20 }, /* CS-1 */ |
| { 34, 33, 30 }, /* CS-2 */ |
| { 40, 39, 36 }, /* CS-3 */ |
| { 54, 53, 50 }, /* CS-4 */ |
| }; |
| |
| LLIST_HEAD(gprs_rlcmac_ul_tbfs); |
| LLIST_HEAD(gprs_rlcmac_dl_tbfs); |
| llist_head *gprs_rlcmac_tbfs_lists[] = { |
| &gprs_rlcmac_ul_tbfs, |
| &gprs_rlcmac_dl_tbfs, |
| NULL |
| }; |
| extern void *tall_pcu_ctx; |
| |
| #ifdef DEBUG_DIAGRAM |
| struct timeval diagram_time = {0,0}; |
| struct timeval diagram_last_tv = {0,0}; |
| |
| void debug_diagram(int diag, const char *format, ...) |
| { |
| va_list ap; |
| char debug[128]; |
| char line[1024]; |
| struct gprs_rlcmac_tbf *tbf, *tbf_a[16]; |
| int max_diag = -1, i; |
| uint64_t diff = 0; |
| |
| va_start(ap, format); |
| vsnprintf(debug, sizeof(debug) - 1, format, ap); |
| debug[19] = ' '; |
| debug[20] = '\0'; |
| va_end(ap); |
| |
| memset(tbf_a, 0, sizeof(tbf_a)); |
| llist_for_each_entry(tbf, &gprs_rlcmac_ul_tbfs, list) { |
| if (tbf->diag < 16) { |
| if (tbf->diag > max_diag) |
| max_diag = tbf->diag; |
| tbf_a[tbf->diag] = tbf; |
| } |
| } |
| llist_for_each_entry(tbf, &gprs_rlcmac_dl_tbfs, list) { |
| if (tbf->diag < 16) { |
| if (tbf->diag > max_diag) |
| max_diag = tbf->diag; |
| tbf_a[tbf->diag] = tbf; |
| } |
| } |
| |
| if (diagram_last_tv.tv_sec) { |
| diff = (uint64_t)(diagram_time.tv_sec - |
| diagram_last_tv.tv_sec) * 1000; |
| diff += diagram_time.tv_usec / 1000; |
| diff -= diagram_last_tv.tv_usec / 1000; |
| } |
| memcpy(&diagram_last_tv, &diagram_time, sizeof(struct timeval)); |
| |
| if (diff > 0) { |
| if (diff > 99999) |
| strcpy(line, " ... : "); |
| else |
| sprintf(line, "%3d.%03d: ", (int)(diff / 1000), |
| (int)(diff % 1000)); |
| for (i = 0; i <= max_diag; i++) { |
| if (tbf_a[i] == NULL) { |
| strcat(line, " "); |
| continue; |
| } |
| if (tbf_a[i]->diag_new) { |
| strcat(line, " | "); |
| continue; |
| } |
| strcat(line, " "); |
| } |
| puts(line); |
| } |
| strcpy(line, " : "); |
| for (i = 0; i <= max_diag; i++) { |
| if (tbf_a[i] == NULL) { |
| strcat(line, " "); |
| continue; |
| } |
| if (tbf_a[i]->diag != diag) { |
| strcat(line, " | "); |
| continue; |
| } |
| if (strlen(debug) < 19) { |
| strcat(line, " "); |
| memcpy(line + strlen(line) - 11 - strlen(debug) / 2, |
| debug, strlen(debug)); |
| } else |
| strcat(line, debug); |
| tbf_a[i]->diag_new = 1; |
| } |
| puts(line); |
| } |
| #endif |
| |
| /* FIXME: spread resources over multiple TRX. Also add option to use same |
| * TRX in case of existing TBF for TLLI in the other direction. */ |
| /* search for free TFI and return TFI, TRX */ |
| int tfi_find_free(struct gprs_rlcmac_bts *bts, enum gprs_rlcmac_tbf_direction dir, |
| uint8_t *_trx, int8_t use_trx) |
| { |
| struct gprs_rlcmac_pdch *pdch; |
| struct gprs_rlcmac_tbf **tbfp; |
| uint8_t trx_from, trx_to, trx, ts, tfi; |
| |
| if (use_trx >= 0 && use_trx < 8) |
| trx_from = trx_to = use_trx; |
| else { |
| trx_from = 0; |
| trx_to = 7; |
| } |
| |
| /* on TRX find first enabled TS */ |
| for (trx = trx_from; trx <= trx_to; trx++) { |
| for (ts = 0; ts < 8; ts++) { |
| pdch = &bts->trx[trx].pdch[ts]; |
| if (!pdch->enable) |
| continue; |
| break; |
| } |
| if (ts < 8) |
| break; |
| } |
| if (trx > trx_to) { |
| LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH available.\n"); |
| return -EINVAL; |
| } |
| |
| |
| LOGP(DRLCMAC, LOGL_DEBUG, "Searching for first unallocated TFI: " |
| "TRX=%d first TS=%d\n", trx, ts); |
| if (dir == GPRS_RLCMAC_UL_TBF) |
| tbfp = bts->trx[trx].ul_tbf; |
| else |
| tbfp = bts->trx[trx].dl_tbf; |
| for (tfi = 0; tfi < 32; tfi++) { |
| if (!tbfp[tfi]) |
| break; |
| } |
| |
| if (tfi < 32) { |
| LOGP(DRLCMAC, LOGL_DEBUG, " Found TFI=%d.\n", tfi); |
| *_trx = trx; |
| return tfi; |
| } |
| LOGP(DRLCMAC, LOGL_NOTICE, "No TFI available.\n"); |
| |
| return -1; |
| } |
| |
| /* starting time for assigning single slot |
| * This offset must be a multiple of 13. */ |
| #define AGCH_START_OFFSET 52 |
| |
| LLIST_HEAD(gprs_rlcmac_sbas); |
| |
| int sba_alloc(uint8_t *_trx, uint8_t *_ts, uint32_t *_fn, uint8_t ta) |
| { |
| |
| struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| struct gprs_rlcmac_pdch *pdch; |
| struct gprs_rlcmac_sba *sba; |
| uint8_t trx, ts; |
| uint32_t fn; |
| |
| sba = talloc_zero(tall_pcu_ctx, struct gprs_rlcmac_sba); |
| if (!sba) |
| return -ENOMEM; |
| |
| for (trx = 0; trx < 8; trx++) { |
| for (ts = 0; ts < 8; ts++) { |
| pdch = &bts->trx[trx].pdch[ts]; |
| if (!pdch->enable) |
| continue; |
| break; |
| } |
| if (ts < 8) |
| break; |
| } |
| if (trx == 8) { |
| LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH available.\n"); |
| talloc_free(sba); |
| return -EINVAL; |
| } |
| |
| fn = (pdch->last_rts_fn + AGCH_START_OFFSET) % 2715648; |
| |
| sba->trx = trx; |
| sba->ts = ts; |
| sba->fn = fn; |
| sba->ta = ta; |
| |
| llist_add(&sba->list, &gprs_rlcmac_sbas); |
| |
| *_trx = trx; |
| *_ts = ts; |
| *_fn = fn; |
| return 0; |
| } |
| |
| struct gprs_rlcmac_sba *sba_find(uint8_t trx, uint8_t ts, uint32_t fn) |
| { |
| struct gprs_rlcmac_sba *sba; |
| |
| llist_for_each_entry(sba, &gprs_rlcmac_sbas, list) { |
| if (sba->trx == trx && sba->ts == ts && sba->fn == fn) |
| return sba; |
| } |
| |
| return NULL; |
| } |
| |
| /* received RLC/MAC block from L1 */ |
| int gprs_rlcmac_rcv_block(uint8_t trx, uint8_t ts, uint8_t *data, uint8_t len, |
| uint32_t fn, int8_t rssi) |
| { |
| unsigned payload = data[0] >> 6; |
| bitvec *block; |
| int rc = 0; |
| |
| switch (payload) { |
| case GPRS_RLCMAC_DATA_BLOCK: |
| rc = gprs_rlcmac_rcv_data_block_acknowledged(trx, ts, data, |
| len, rssi); |
| break; |
| case GPRS_RLCMAC_CONTROL_BLOCK: |
| block = bitvec_alloc(len); |
| if (!block) |
| return -ENOMEM; |
| bitvec_unpack(block, data); |
| rc = gprs_rlcmac_rcv_control_block(block, trx, ts, fn); |
| bitvec_free(block); |
| break; |
| case GPRS_RLCMAC_CONTROL_BLOCK_OPT: |
| LOGP(DRLCMAC, LOGL_NOTICE, "GPRS_RLCMAC_CONTROL_BLOCK_OPT block payload is not supported.\n"); |
| break; |
| default: |
| LOGP(DRLCMAC, LOGL_NOTICE, "Unknown RLCMAC block payload(%u).\n", payload); |
| rc = -EINVAL; |
| } |
| |
| return rc; |
| } |
| |
| /* add paging to paging queue(s) */ |
| int gprs_rlcmac_add_paging(uint8_t chan_needed, uint8_t *identity_lv) |
| { |
| struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| uint8_t l, trx, ts, any_tbf = 0; |
| struct gprs_rlcmac_tbf *tbf; |
| struct gprs_rlcmac_paging *pag; |
| uint8_t slot_mask[8]; |
| int8_t first_ts; /* must be signed */ |
| |
| LOGP(DRLCMAC, LOGL_INFO, "Add RR paging: chan-needed=%d MI=%s\n", |
| chan_needed, osmo_hexdump(identity_lv + 1, identity_lv[0])); |
| |
| /* collect slots to page |
| * Mark slots for every TBF, but only mark one of it. |
| * Mark only the first slot found. |
| * Don't mark, if TBF uses a different slot that is already marked. */ |
| memset(slot_mask, 0, sizeof(slot_mask)); |
| for (l = 0; gprs_rlcmac_tbfs_lists[l]; l++) { |
| llist_for_each_entry(tbf, gprs_rlcmac_tbfs_lists[l], list) { |
| first_ts = -1; |
| for (ts = 0; ts < 8; ts++) { |
| if (tbf->pdch[ts]) { |
| /* remember the first slot found */ |
| if (first_ts < 0) |
| first_ts = ts; |
| /* break, if we already marked a slot */ |
| if ((slot_mask[tbf->trx_no] & (1 << ts))) |
| break; |
| } |
| } |
| /* mark first slot found, if none is marked already */ |
| if (ts == 8 && first_ts >= 0) { |
| LOGP(DRLCMAC, LOGL_DEBUG, "- %s TBF=%d uses " |
| "TRX=%d TS=%d, so we mark\n", |
| (tbf->direction == GPRS_RLCMAC_UL_TBF) |
| ? "UL" : "DL", |
| tbf->tfi, tbf->trx_no, first_ts); |
| slot_mask[tbf->trx_no] |= (1 << first_ts); |
| } else |
| LOGP(DRLCMAC, LOGL_DEBUG, "- %s TBF=%d uses " |
| "already marked TRX=%d TS=%d\n", |
| (tbf->direction == GPRS_RLCMAC_UL_TBF) |
| ? "UL" : "DL", |
| tbf->tfi, tbf->trx_no, ts); |
| } |
| } |
| |
| /* Now we have a list of marked slots. Every TBF uses at least one |
| * of these slots. */ |
| |
| /* schedule paging to all marked slots */ |
| for (trx = 0; trx < 8; trx++) { |
| if (slot_mask[trx] == 0) |
| continue; |
| any_tbf = 1; |
| for (ts = 0; ts < 8; ts++) { |
| if ((slot_mask[trx] & (1 << ts))) { |
| /* schedule */ |
| pag = talloc_zero(tall_pcu_ctx, |
| struct gprs_rlcmac_paging); |
| if (!pag) |
| return -ENOMEM; |
| pag->chan_needed = chan_needed; |
| memcpy(pag->identity_lv, identity_lv, |
| identity_lv[0] + 1); |
| llist_add(&pag->list, |
| &bts->trx[trx].pdch[ts].paging_list); |
| LOGP(DRLCMAC, LOGL_INFO, "Paging on PACCH of " |
| "TRX=%d TS=%d\n", trx, ts); |
| } |
| } |
| } |
| |
| if (!any_tbf) |
| LOGP(DRLCMAC, LOGL_INFO, "No paging, because no TBF\n"); |
| |
| return 0; |
| } |
| |
| struct gprs_rlcmac_paging *gprs_rlcmac_dequeue_paging( |
| struct gprs_rlcmac_pdch *pdch) |
| { |
| struct gprs_rlcmac_paging *pag; |
| |
| if (llist_empty(&pdch->paging_list)) |
| return NULL; |
| pag = llist_entry(pdch->paging_list.next, |
| struct gprs_rlcmac_paging, list); |
| llist_del(&pag->list); |
| |
| return pag; |
| } |
| |
| struct msgb *gprs_rlcmac_send_packet_paging_request( |
| struct gprs_rlcmac_pdch *pdch) |
| { |
| struct gprs_rlcmac_paging *pag; |
| struct msgb *msg; |
| unsigned wp = 0, len; |
| |
| /* no paging, no message */ |
| pag = gprs_rlcmac_dequeue_paging(pdch); |
| if (!pag) |
| return NULL; |
| |
| LOGP(DRLCMAC, LOGL_DEBUG, "Scheduling paging\n"); |
| |
| /* alloc message */ |
| msg = msgb_alloc(23, "pag ctrl block"); |
| if (!msg) { |
| talloc_free(pag); |
| return NULL; |
| } |
| bitvec *pag_vec = bitvec_alloc(23); |
| if (!pag_vec) { |
| msgb_free(msg); |
| talloc_free(pag); |
| return NULL; |
| } |
| wp = write_packet_paging_request(pag_vec); |
| |
| /* loop until message is full */ |
| while (pag) { |
| /* try to add paging */ |
| if ((pag->identity_lv[1] & 0x07) == 4) { |
| /* TMSI */ |
| LOGP(DRLCMAC, LOGL_DEBUG, "- TMSI=0x%08x\n", |
| ntohl(*((uint32_t *)(pag->identity_lv + 1)))); |
| len = 1 + 1 + 1 + 32 + 2 + 1; |
| if (pag->identity_lv[0] != 5) { |
| LOGP(DRLCMAC, LOGL_ERROR, "TMSI paging with " |
| "MI != 5 octets!\n"); |
| goto continue_next; |
| } |
| } else { |
| /* MI */ |
| LOGP(DRLCMAC, LOGL_DEBUG, "- MI=%s\n", |
| osmo_hexdump(pag->identity_lv + 1, |
| pag->identity_lv[0])); |
| len = 1 + 1 + 1 + 4 + (pag->identity_lv[0]<<3) + 2 + 1; |
| if (pag->identity_lv[0] > 8) { |
| LOGP(DRLCMAC, LOGL_ERROR, "Paging with " |
| "MI > 8 octets!\n"); |
| goto continue_next; |
| } |
| } |
| if (wp + len > 184) { |
| LOGP(DRLCMAC, LOGL_DEBUG, "- Does not fit, so schedule " |
| "next time\n"); |
| /* put back paging record, because does not fit */ |
| llist_add_tail(&pag->list, &pdch->paging_list); |
| break; |
| } |
| write_repeated_page_info(pag_vec, wp, pag->identity_lv[0], |
| pag->identity_lv + 1, pag->chan_needed); |
| |
| continue_next: |
| talloc_free(pag); |
| pag = gprs_rlcmac_dequeue_paging(pdch); |
| } |
| |
| bitvec_pack(pag_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 Paging Request +++++++++++++++++++++++++\n"); |
| decode_gsm_rlcmac_downlink(pag_vec, mac_control_block); |
| LOGPC(DCSN1, LOGL_NOTICE, "\n"); |
| LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- TX : Packet Paging Request -------------------------\n"); |
| bitvec_free(pag_vec); |
| talloc_free(mac_control_block); |
| |
| return msg; |
| } |
| |
| // GSM 04.08 9.1.18 Immediate assignment |
| int write_immediate_assignment(bitvec * dest, uint8_t downlink, uint8_t ra, |
| uint32_t ref_fn, uint8_t ta, uint16_t arfcn, uint8_t ts, uint8_t tsc, |
| uint8_t tfi, uint8_t usf, uint32_t tlli, |
| uint8_t polling, uint32_t fn, uint8_t single_block, uint8_t alpha, |
| uint8_t gamma, int8_t ta_idx) |
| { |
| unsigned wp = 0; |
| uint8_t plen; |
| |
| bitvec_write_field(dest, wp,0x0,4); // Skip Indicator |
| bitvec_write_field(dest, wp,0x6,4); // Protocol Discriminator |
| bitvec_write_field(dest, wp,0x3F,8); // Immediate Assignment Message Type |
| |
| // 10.5.2.25b Dedicated mode or TBF |
| bitvec_write_field(dest, wp,0x0,1); // spare |
| bitvec_write_field(dest, wp,0x0,1); // TMA : Two-message assignment: No meaning |
| bitvec_write_field(dest, wp,downlink,1); // Downlink : Downlink assignment to mobile in packet idle mode |
| bitvec_write_field(dest, wp,0x1,1); // T/D : TBF or dedicated mode: this message assigns a Temporary Block Flow (TBF). |
| |
| bitvec_write_field(dest, wp,0x0,4); // Page Mode |
| |
| // GSM 04.08 10.5.2.25a Packet Channel Description |
| bitvec_write_field(dest, wp,0x1,5); // Channel type |
| bitvec_write_field(dest, wp,ts,3); // TN |
| bitvec_write_field(dest, wp,tsc,3); // TSC |
| bitvec_write_field(dest, wp,0x0,3); // non-hopping RF channel configuraion |
| bitvec_write_field(dest, wp,arfcn,10); // ARFCN |
| |
| //10.5.2.30 Request Reference |
| bitvec_write_field(dest, wp,ra,8); // RA |
| bitvec_write_field(dest, wp,(ref_fn / (26 * 51)) % 32,5); // T1' |
| bitvec_write_field(dest, wp,ref_fn % 51,6); // T3 |
| bitvec_write_field(dest, wp,ref_fn % 26,5); // T2 |
| |
| // 10.5.2.40 Timing Advance |
| bitvec_write_field(dest, wp,0x0,2); // spare |
| bitvec_write_field(dest, wp,ta,6); // Timing Advance value |
| |
| // No mobile allocation in non-hopping systems. |
| // A zero-length LV. Just write L=0. |
| bitvec_write_field(dest, wp,0,8); |
| |
| if ((wp % 8)) { |
| LOGP(DRLCMACUL, LOGL_ERROR, "Length of IMM.ASS without rest " |
| "octets is not multiple of 8 bits, PLEASE FIX!\n"); |
| exit (0); |
| } |
| plen = wp / 8; |
| |
| if (downlink) |
| { |
| // GSM 04.08 10.5.2.16 IA Rest Octets |
| bitvec_write_field(dest, wp, 3, 2); // "HH" |
| bitvec_write_field(dest, wp, 1, 2); // "01" Packet Downlink Assignment |
| bitvec_write_field(dest, wp,tlli,32); // TLLI |
| bitvec_write_field(dest, wp,0x1,1); // switch TFI : on |
| bitvec_write_field(dest, wp,tfi,5); // TFI |
| bitvec_write_field(dest, wp,0x0,1); // RLC acknowledged mode |
| if (alpha) { |
| bitvec_write_field(dest, wp,0x1,1); // ALPHA = present |
| bitvec_write_field(dest, wp,alpha,4); // ALPHA |
| } else { |
| bitvec_write_field(dest, wp,0x0,1); // ALPHA = not present |
| } |
| bitvec_write_field(dest, wp,gamma,5); // GAMMA power control parameter |
| bitvec_write_field(dest, wp,polling,1); // Polling Bit |
| bitvec_write_field(dest, wp,!polling,1); // TA_VALID ??? |
| if (ta_idx < 0) { |
| bitvec_write_field(dest, wp,0x0,1); // switch TIMING_ADVANCE_INDEX = off |
| } else { |
| bitvec_write_field(dest, wp,0x1,1); // switch TIMING_ADVANCE_INDEX = on |
| bitvec_write_field(dest, wp,ta_idx,4); // TIMING_ADVANCE_INDEX |
| } |
| if (polling) { |
| bitvec_write_field(dest, wp,0x1,1); // TBF Starting TIME present |
| bitvec_write_field(dest, wp,(fn / (26 * 51)) % 32,5); // T1' |
| bitvec_write_field(dest, wp,fn % 51,6); // T3 |
| bitvec_write_field(dest, wp,fn % 26,5); // T2 |
| } else { |
| bitvec_write_field(dest, wp,0x0,1); // TBF Starting TIME present |
| } |
| bitvec_write_field(dest, wp,0x0,1); // P0 not present |
| // bitvec_write_field(dest, wp,0x1,1); // P0 not present |
| // bitvec_write_field(dest, wp,0xb,4); |
| } |
| else |
| { |
| struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| // GMS 04.08 10.5.2.37b 10.5.2.16 |
| bitvec_write_field(dest, wp, 3, 2); // "HH" |
| bitvec_write_field(dest, wp, 0, 2); // "0" Packet Uplink Assignment |
| if (single_block) { |
| bitvec_write_field(dest, wp, 0, 1); // Block Allocation : Single Block Allocation |
| if (alpha) { |
| bitvec_write_field(dest, wp,0x1,1); // ALPHA = present |
| bitvec_write_field(dest, wp,alpha,4); // ALPHA = present |
| } else |
| bitvec_write_field(dest, wp,0x0,1); // ALPHA = not present |
| bitvec_write_field(dest, wp,gamma,5); // GAMMA power control parameter |
| if (ta_idx < 0) { |
| bitvec_write_field(dest, wp,0x0,1); // switch TIMING_ADVANCE_INDEX = off |
| } else { |
| bitvec_write_field(dest, wp,0x1,1); // switch TIMING_ADVANCE_INDEX = on |
| bitvec_write_field(dest, wp,ta_idx,4); // TIMING_ADVANCE_INDEX |
| } |
| bitvec_write_field(dest, wp, 1, 1); // TBF_STARTING_TIME_FLAG |
| bitvec_write_field(dest, wp,(fn / (26 * 51)) % 32,5); // T1' |
| bitvec_write_field(dest, wp,fn % 51,6); // T3 |
| bitvec_write_field(dest, wp,fn % 26,5); // T2 |
| } else { |
| bitvec_write_field(dest, wp, 1, 1); // Block Allocation : Not Single Block Allocation |
| bitvec_write_field(dest, wp, tfi, 5); // TFI_ASSIGNMENT Temporary Flow Identity |
| bitvec_write_field(dest, wp, 0, 1); // POLLING |
| bitvec_write_field(dest, wp, 0, 1); // ALLOCATION_TYPE: dynamic |
| bitvec_write_field(dest, wp, usf, 3); // USF |
| bitvec_write_field(dest, wp, 0, 1); // USF_GRANULARITY |
| bitvec_write_field(dest, wp, 0, 1); // "0" power control: Not Present |
| bitvec_write_field(dest, wp, bts->initial_cs_ul-1, 2); // CHANNEL_CODING_COMMAND |
| bitvec_write_field(dest, wp, 1, 1); // TLLI_BLOCK_CHANNEL_CODING |
| if (alpha) { |
| bitvec_write_field(dest, wp,0x1,1); // ALPHA = present |
| bitvec_write_field(dest, wp,alpha,4); // ALPHA |
| } else |
| bitvec_write_field(dest, wp,0x0,1); // ALPHA = not present |
| bitvec_write_field(dest, wp,gamma,5); // GAMMA power control parameter |
| /* note: there is no choise for TAI and no starting time */ |
| bitvec_write_field(dest, wp, 0, 1); // switch TIMING_ADVANCE_INDEX = off |
| bitvec_write_field(dest, wp, 0, 1); // TBF_STARTING_TIME_FLAG |
| } |
| } |
| |
| return plen; |
| } |
| |
| /* generate uplink assignment */ |
| void write_packet_uplink_assignment(bitvec * dest, uint8_t old_tfi, |
| uint8_t old_downlink, uint32_t tlli, uint8_t use_tlli, |
| struct gprs_rlcmac_tbf *tbf, uint8_t poll, uint8_t alpha, |
| uint8_t gamma, int8_t ta_idx) |
| { |
| // TODO We should use our implementation of encode RLC/MAC Control messages. |
| struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| unsigned wp = 0; |
| uint8_t ts; |
| |
| bitvec_write_field(dest, wp,0x1,2); // Payload Type |
| bitvec_write_field(dest, wp,0x0,2); // Uplink block with TDMA framenumber (N+13) |
| bitvec_write_field(dest, wp,poll,1); // Suppl/Polling Bit |
| bitvec_write_field(dest, wp,0x0,3); // Uplink state flag |
| bitvec_write_field(dest, wp,0xa,6); // MESSAGE TYPE |
| |
| bitvec_write_field(dest, wp,0x0,2); // Page Mode |
| |
| bitvec_write_field(dest, wp,0x0,1); // switch PERSIST_LEVEL: off |
| if (use_tlli) { |
| bitvec_write_field(dest, wp,0x2,2); // switch TLLI : on |
| bitvec_write_field(dest, wp,tlli,32); // TLLI |
| } else { |
| bitvec_write_field(dest, wp,0x0,1); // switch TFI : on |
| bitvec_write_field(dest, wp,old_downlink,1); // 0=UPLINK TFI, 1=DL TFI |
| bitvec_write_field(dest, wp,old_tfi,5); // TFI |
| } |
| |
| bitvec_write_field(dest, wp,0x0,1); // Message escape |
| bitvec_write_field(dest, wp,bts->initial_cs_ul-1, 2); // CHANNEL_CODING_COMMAND |
| bitvec_write_field(dest, wp,0x1,1); // TLLI_BLOCK_CHANNEL_CODING |
| bitvec_write_field(dest, wp,0x1,1); // switch TIMING_ADVANCE_VALUE = on |
| bitvec_write_field(dest, wp,tbf->ta,6); // TIMING_ADVANCE_VALUE |
| if (ta_idx < 0) { |
| bitvec_write_field(dest, wp,0x0,1); // switch TIMING_ADVANCE_INDEX = off |
| } else { |
| bitvec_write_field(dest, wp,0x1,1); // switch TIMING_ADVANCE_INDEX = on |
| bitvec_write_field(dest, wp,ta_idx,4); // TIMING_ADVANCE_INDEX |
| } |
| |
| #if 1 |
| bitvec_write_field(dest, wp,0x1,1); // Frequency Parameters information elements = present |
| bitvec_write_field(dest, wp,tbf->tsc,3); // Training Sequence Code (TSC) |
| bitvec_write_field(dest, wp,0x0,2); // ARFCN = present |
| bitvec_write_field(dest, wp,tbf->arfcn,10); // ARFCN |
| #else |
| bitvec_write_field(dest, wp,0x0,1); // Frequency Parameters = off |
| #endif |
| |
| bitvec_write_field(dest, wp,0x1,2); // Dynamic Allocation |
| |
| bitvec_write_field(dest, wp,0x0,1); // Extended Dynamic Allocation = off |
| bitvec_write_field(dest, wp,0x0,1); // P0 = off |
| |
| bitvec_write_field(dest, wp,0x0,1); // USF_GRANULARITY |
| bitvec_write_field(dest, wp,0x1,1); // switch TFI : on |
| bitvec_write_field(dest, wp,tbf->tfi,5);// TFI |
| |
| bitvec_write_field(dest, wp,0x0,1); // |
| bitvec_write_field(dest, wp,0x0,1); // TBF Starting Time = off |
| if (alpha || gamma) { |
| bitvec_write_field(dest, wp,0x1,1); // Timeslot Allocation with Power Control |
| bitvec_write_field(dest, wp,alpha,4); // ALPHA |
| } else |
| bitvec_write_field(dest, wp,0x0,1); // Timeslot Allocation |
| |
| for (ts = 0; ts < 8; ts++) { |
| if (tbf->pdch[ts]) { |
| bitvec_write_field(dest, wp,0x1,1); // USF_TN(i): on |
| bitvec_write_field(dest, wp,tbf->dir.ul.usf[ts],3); // USF_TN(i) |
| if (alpha || gamma) |
| bitvec_write_field(dest, wp,gamma,5); // GAMMA power control parameter |
| } else |
| bitvec_write_field(dest, wp,0x0,1); // USF_TN(i): off |
| } |
| // bitvec_write_field(dest, wp,0x0,1); // Measurement Mapping struct not present |
| } |
| |
| |
| /* generate downlink assignment */ |
| void write_packet_downlink_assignment(RlcMacDownlink_t * block, uint8_t old_tfi, |
| uint8_t old_downlink, struct gprs_rlcmac_tbf *tbf, uint8_t poll, |
| uint8_t alpha, uint8_t gamma, int8_t ta_idx, uint8_t ta_ts) |
| { |
| // Packet downlink assignment TS 44.060 11.2.7 |
| |
| uint8_t tn; |
| |
| block->PAYLOAD_TYPE = 0x1; // RLC/MAC control block that does not include the optional octets of the RLC/MAC control header |
| block->RRBP = 0x0; // N+13 |
| block->SP = poll; // RRBP field is valid |
| block->USF = 0x0; // Uplink state flag |
| |
| block->u.Packet_Downlink_Assignment.MESSAGE_TYPE = 0x2; // Packet Downlink Assignment |
| block->u.Packet_Downlink_Assignment.PAGE_MODE = 0x0; // Normal Paging |
| |
| block->u.Packet_Downlink_Assignment.Exist_PERSISTENCE_LEVEL = 0x0; // PERSISTENCE_LEVEL: off |
| |
| block->u.Packet_Downlink_Assignment.ID.UnionType = 0x0; // TFI = on |
| block->u.Packet_Downlink_Assignment.ID.u.Global_TFI.UnionType = old_downlink; // 0=UPLINK TFI, 1=DL TFI |
| block->u.Packet_Downlink_Assignment.ID.u.Global_TFI.u.UPLINK_TFI = old_tfi; // TFI |
| |
| block->u.Packet_Downlink_Assignment.MAC_MODE = 0x0; // Dynamic Allocation |
| block->u.Packet_Downlink_Assignment.RLC_MODE = 0x0; // RLC acknowledged mode |
| block->u.Packet_Downlink_Assignment.CONTROL_ACK = old_downlink; // NW establishes no new DL TBF for the MS with running timer T3192 |
| block->u.Packet_Downlink_Assignment.TIMESLOT_ALLOCATION = 0; // timeslot(s) |
| for (tn = 0; tn < 8; tn++) { |
| if (tbf->pdch[tn]) |
| block->u.Packet_Downlink_Assignment.TIMESLOT_ALLOCATION |= 0x80 >> tn; // timeslot(s) |
| } |
| |
| block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.Exist_TIMING_ADVANCE_VALUE = 0x1; // TIMING_ADVANCE_VALUE = on |
| block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.TIMING_ADVANCE_VALUE = tbf->ta; // TIMING_ADVANCE_VALUE |
| if (ta_idx < 0) { |
| block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.Exist_IndexAndtimeSlot = 0x0; // TIMING_ADVANCE_INDEX = off |
| } else { |
| block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.Exist_IndexAndtimeSlot = 0x1; // TIMING_ADVANCE_INDEX = on |
| block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.TIMING_ADVANCE_INDEX = ta_idx; // TIMING_ADVANCE_INDEX |
| block->u.Packet_Downlink_Assignment.Packet_Timing_Advance.TIMING_ADVANCE_TIMESLOT_NUMBER = ta_ts; // TIMING_ADVANCE_TS |
| } |
| |
| block->u.Packet_Downlink_Assignment.Exist_P0_and_BTS_PWR_CTRL_MODE = 0x0; // POWER CONTROL = off |
| |
| block->u.Packet_Downlink_Assignment.Exist_Frequency_Parameters = 0x1; // Frequency Parameters = on |
| block->u.Packet_Downlink_Assignment.Frequency_Parameters.TSC = tbf->tsc; // Training Sequence Code (TSC) |
| block->u.Packet_Downlink_Assignment.Frequency_Parameters.UnionType = 0x0; // ARFCN = on |
| block->u.Packet_Downlink_Assignment.Frequency_Parameters.u.ARFCN = tbf->arfcn; // ARFCN |
| |
| block->u.Packet_Downlink_Assignment.Exist_DOWNLINK_TFI_ASSIGNMENT = 0x1; // DOWNLINK TFI ASSIGNMENT = on |
| block->u.Packet_Downlink_Assignment.DOWNLINK_TFI_ASSIGNMENT = tbf->tfi; // TFI |
| |
| block->u.Packet_Downlink_Assignment.Exist_Power_Control_Parameters = 0x1; // Power Control Parameters = on |
| block->u.Packet_Downlink_Assignment.Power_Control_Parameters.ALPHA = alpha; // ALPHA |
| |
| for (tn = 0; tn < 8; tn++) |
| { |
| if (tbf->pdch[tn]) |
| { |
| block->u.Packet_Downlink_Assignment.Power_Control_Parameters.Slot[tn].Exist = 0x1; // Slot[i] = on |
| block->u.Packet_Downlink_Assignment.Power_Control_Parameters.Slot[tn].GAMMA_TN = gamma; // GAMMA_TN |
| } |
| else |
| { |
| block->u.Packet_Downlink_Assignment.Power_Control_Parameters.Slot[tn].Exist = 0x0; // Slot[i] = off |
| } |
| } |
| |
| block->u.Packet_Downlink_Assignment.Exist_TBF_Starting_Time = 0x0; // TBF Starting TIME = off |
| block->u.Packet_Downlink_Assignment.Exist_Measurement_Mapping = 0x0; // Measurement_Mapping = off |
| block->u.Packet_Downlink_Assignment.Exist_AdditionsR99 = 0x0; // AdditionsR99 = off |
| } |
| |
| /* generate paging request */ |
| int write_paging_request(bitvec * dest, uint8_t *ptmsi, uint16_t ptmsi_len) |
| { |
| unsigned wp = 0; |
| int plen; |
| |
| bitvec_write_field(dest, wp,0x0,4); // Skip Indicator |
| bitvec_write_field(dest, wp,0x6,4); // Protocol Discriminator |
| bitvec_write_field(dest, wp,0x21,8); // Paging Request Message Type |
| |
| bitvec_write_field(dest, wp,0x0,4); // Page Mode |
| bitvec_write_field(dest, wp,0x0,4); // Channel Needed |
| |
| // Mobile Identity |
| bitvec_write_field(dest, wp,ptmsi_len+1,8); // Mobile Identity length |
| bitvec_write_field(dest, wp,0xf,4); // unused |
| bitvec_write_field(dest, wp,0x4,4); // PTMSI type |
| for (int i = 0; i < ptmsi_len; i++) |
| { |
| bitvec_write_field(dest, wp,ptmsi[i],8); // PTMSI |
| } |
| if ((wp % 8)) { |
| LOGP(DRLCMACUL, LOGL_ERROR, "Length of PAG.REQ without rest " |
| "octets is not multiple of 8 bits, PLEASE FIX!\n"); |
| exit (0); |
| } |
| plen = wp / 8; |
| bitvec_write_field(dest, wp,0x0,1); // "L" NLN(PCH) = off |
| bitvec_write_field(dest, wp,0x0,1); // "L" Priority1 = off |
| bitvec_write_field(dest, wp,0x1,1); // "L" Priority2 = off |
| bitvec_write_field(dest, wp,0x0,1); // "L" Group Call information = off |
| bitvec_write_field(dest, wp,0x0,1); // "H" Packet Page Indication 1 = packet paging procedure |
| bitvec_write_field(dest, wp,0x1,1); // "H" Packet Page Indication 2 = packet paging procedure |
| |
| return plen; |
| } |
| |
| /* generate uplink ack */ |
| void write_packet_uplink_ack(RlcMacDownlink_t * block, struct gprs_rlcmac_tbf *tbf, |
| uint8_t final) |
| { |
| // Packet Uplink Ack/Nack TS 44.060 11.2.28 |
| |
| char show_v_n[65]; |
| |
| struct gprs_rlcmac_bts *bts = gprs_rlcmac_bts; |
| uint8_t rbb = 0; |
| uint16_t i, bbn; |
| uint16_t mod_sns_half = (tbf->sns >> 1) - 1; |
| char bit; |
| |
| LOGP(DRLCMACUL, LOGL_DEBUG, "Sending Ack/Nack for TBF=%d " |
| "(final=%d)\n", tbf->tfi, final); |
| |
| block->PAYLOAD_TYPE = 0x1; // RLC/MAC control block that does not include the optional octets of the RLC/MAC control header |
| block->RRBP = 0x0; // N+13 |
| block->SP = final; // RRBP field is valid, if it is final ack |
| block->USF = 0x0; // Uplink state flag |
| |
| block->u.Packet_Uplink_Ack_Nack.MESSAGE_TYPE = 0x9; // Packet Downlink Assignment |
| block->u.Packet_Uplink_Ack_Nack.PAGE_MODE = 0x0; // Normal Paging |
| block->u.Packet_Uplink_Ack_Nack.UPLINK_TFI = tbf->tfi; // Uplink TFI |
| |
| block->u.Packet_Uplink_Ack_Nack.UnionType = 0x0; // PU_AckNack_GPRS = on |
| block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.CHANNEL_CODING_COMMAND = bts->initial_cs_ul - 1; // CS1 |
| block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Ack_Nack_Description.FINAL_ACK_INDICATION = final; // FINAL ACK INDICATION |
| block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Ack_Nack_Description.STARTING_SEQUENCE_NUMBER = tbf->dir.ul.v_r; // STARTING_SEQUENCE_NUMBER |
| // RECEIVE_BLOCK_BITMAP |
| for (i = 0, bbn = (tbf->dir.ul.v_r - 64) & mod_sns_half; i < 64; |
| i++, bbn = (bbn + 1) & mod_sns_half) { |
| bit = tbf->dir.ul.v_n[bbn]; |
| if (bit == 0) |
| bit = ' '; |
| show_v_n[i] = bit; |
| if (bit == 'R') |
| rbb = (rbb << 1)|1; |
| else |
| rbb = (rbb << 1); |
| if((i%8) == 7) |
| { |
| block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Ack_Nack_Description.RECEIVED_BLOCK_BITMAP[i/8] = rbb; |
| rbb = 0; |
| } |
| } |
| show_v_n[64] = '\0'; |
| LOGP(DRLCMACUL, LOGL_DEBUG, "- V(N): \"%s\" R=Received " |
| "N=Not-Received\n", show_v_n); |
| |
| block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.UnionType = 0x0; // Fixed Allocation Dummy = on |
| block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.u.FixedAllocationDummy = 0x0; // Fixed Allocation Dummy |
| block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Exist_AdditionsR99 = 0x0; // AdditionsR99 = off |
| |
| block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Common_Uplink_Ack_Nack_Data.Exist_CONTENTION_RESOLUTION_TLLI = 0x1; |
| block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Common_Uplink_Ack_Nack_Data.CONTENTION_RESOLUTION_TLLI = tbf->tlli; |
| block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Common_Uplink_Ack_Nack_Data.Exist_Packet_Timing_Advance = 0x0; |
| block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Common_Uplink_Ack_Nack_Data.Exist_Extension_Bits = 0x0; |
| block->u.Packet_Uplink_Ack_Nack.u.PU_AckNack_GPRS_Struct.Common_Uplink_Ack_Nack_Data.Exist_Power_Control_Parameters = 0x0; |
| } |
| |
| unsigned write_packet_paging_request(bitvec * dest) |
| { |
| unsigned wp = 0; |
| |
| bitvec_write_field(dest, wp,0x1,2); // Payload Type |
| bitvec_write_field(dest, wp,0x0,3); // No polling |
| bitvec_write_field(dest, wp,0x0,3); // Uplink state flag |
| bitvec_write_field(dest, wp,0x22,6); // MESSAGE TYPE |
| |
| bitvec_write_field(dest, wp,0x0,2); // Page Mode |
| |
| bitvec_write_field(dest, wp,0x0,1); // No PERSISTENCE_LEVEL |
| bitvec_write_field(dest, wp,0x0,1); // No NLN |
| |
| return wp; |
| } |
| |
| unsigned write_repeated_page_info(bitvec * dest, unsigned& wp, uint8_t len, |
| uint8_t *identity, uint8_t chan_needed) |
| { |
| bitvec_write_field(dest, wp,0x1,1); // Repeated Page info exists |
| |
| bitvec_write_field(dest, wp,0x1,1); // RR connection paging |
| |
| if ((identity[0] & 0x07) == 4) { |
| bitvec_write_field(dest, wp,0x0,1); // TMSI |
| identity++; |
| len--; |
| } else { |
| bitvec_write_field(dest, wp,0x0,1); // MI |
| bitvec_write_field(dest, wp,len,4); // MI len |
| } |
| while (len) { |
| bitvec_write_field(dest, wp,*identity++,8); // MI data |
| len--; |
| } |
| bitvec_write_field(dest, wp,chan_needed,2); // CHANNEL_NEEDED |
| bitvec_write_field(dest, wp,0x0,1); // No eMLPP_PRIORITY |
| |
| return wp; |
| } |
| |
| /* Send Uplink unit-data to SGSN. */ |
| int gprs_rlcmac_tx_ul_ud(gprs_rlcmac_tbf *tbf) |
| { |
| uint8_t qos_profile[3]; |
| struct msgb *llc_pdu; |
| unsigned msg_len = NS_HDR_LEN + BSSGP_HDR_LEN + tbf->llc_index; |
| struct bssgp_bvc_ctx *bctx = gprs_bssgp_pcu_current_bctx(); |
| |
| LOGP(DBSSGP, LOGL_INFO, "LLC [PCU -> SGSN] TFI: %u TLLI: 0x%08x len=%d\n", tbf->tfi, tbf->tlli, tbf->llc_index); |
| if (!bctx) { |
| LOGP(DBSSGP, LOGL_ERROR, "No bctx\n"); |
| return -EIO; |
| } |
| |
| llc_pdu = msgb_alloc_headroom(msg_len, msg_len,"llc_pdu"); |
| uint8_t *buf = msgb_push(llc_pdu, TL16V_GROSS_LEN(sizeof(uint8_t)*tbf->llc_index)); |
| tl16v_put(buf, BSSGP_IE_LLC_PDU, sizeof(uint8_t)*tbf->llc_index, tbf->llc_frame); |
| qos_profile[0] = QOS_PROFILE >> 16; |
| qos_profile[1] = QOS_PROFILE >> 8; |
| qos_profile[2] = QOS_PROFILE; |
| bssgp_tx_ul_ud(bctx, tbf->tlli, qos_profile, llc_pdu); |
| |
| return 0; |
| } |
| |
| int gprs_rlcmac_paging_request(uint8_t *ptmsi, uint16_t ptmsi_len, |
| const char *imsi) |
| { |
| LOGP(DRLCMAC, LOGL_NOTICE, "TX: [PCU -> BTS] Paging Request (CCCH)\n"); |
| bitvec *paging_request = bitvec_alloc(23); |
| bitvec_unhex(paging_request, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b"); |
| int plen = write_paging_request(paging_request, ptmsi, ptmsi_len); |
| pcu_l1if_tx_pch(paging_request, plen, (char *)imsi); |
| bitvec_free(paging_request); |
| |
| return 0; |
| } |
| |
| |
| /* |
| * timing advance memory |
| */ |
| |
| /* enable to debug timing advance memory */ |
| //#define DEBUG_TA |
| |
| static LLIST_HEAD(gprs_rlcmac_ta_list); |
| static int gprs_rlcmac_ta_num = 0; |
| |
| struct gprs_rlcmac_ta { |
| struct llist_head list; |
| uint32_t tlli; |
| uint8_t ta; |
| }; |
| |
| /* remember timing advance of a given TLLI */ |
| int remember_timing_advance(uint32_t tlli, uint8_t ta) |
| { |
| struct gprs_rlcmac_ta *ta_entry; |
| |
| /* check for existing entry */ |
| llist_for_each_entry(ta_entry, &gprs_rlcmac_ta_list, list) { |
| if (ta_entry->tlli == tlli) { |
| #ifdef DEBUG_TA |
| fprintf(stderr, "update %08x %d\n", tlli, ta); |
| #endif |
| ta_entry->ta = ta; |
| /* relink to end of list */ |
| llist_del(&ta_entry->list); |
| llist_add_tail(&ta_entry->list, &gprs_rlcmac_ta_list); |
| return 0; |
| } |
| } |
| |
| #ifdef DEBUG_TA |
| fprintf(stderr, "remember %08x %d\n", tlli, ta); |
| #endif |
| /* if list is full, remove oldest entry */ |
| if (gprs_rlcmac_ta_num == 30) { |
| ta_entry = llist_entry(gprs_rlcmac_ta_list.next, |
| struct gprs_rlcmac_ta, list); |
| llist_del(&ta_entry->list); |
| talloc_free(ta_entry); |
| gprs_rlcmac_ta_num--; |
| } |
| |
| /* create new TA entry */ |
| ta_entry = talloc_zero(tall_pcu_ctx, struct gprs_rlcmac_ta); |
| if (!ta_entry) |
| return -ENOMEM; |
| |
| ta_entry->tlli = tlli; |
| ta_entry->ta = ta; |
| llist_add_tail(&ta_entry->list, &gprs_rlcmac_ta_list); |
| gprs_rlcmac_ta_num++; |
| |
| return 0; |
| } |
| |
| int recall_timing_advance(uint32_t tlli) |
| { |
| struct gprs_rlcmac_ta *ta_entry; |
| uint8_t ta; |
| |
| llist_for_each_entry(ta_entry, &gprs_rlcmac_ta_list, list) { |
| if (ta_entry->tlli == tlli) { |
| ta = ta_entry->ta; |
| #ifdef DEBUG_TA |
| fprintf(stderr, "recall %08x %d\n", tlli, ta); |
| #endif |
| return ta; |
| } |
| } |
| #ifdef DEBUG_TA |
| fprintf(stderr, "no entry for %08x\n", tlli); |
| #endif |
| |
| return -EINVAL; |
| } |
| |
| int flush_timing_advance(void) |
| { |
| struct gprs_rlcmac_ta *ta_entry; |
| int count = 0; |
| |
| while (!llist_empty(&gprs_rlcmac_ta_list)) { |
| ta_entry = llist_entry(gprs_rlcmac_ta_list.next, |
| struct gprs_rlcmac_ta, list); |
| #ifdef DEBUG_TA |
| fprintf(stderr, "flush entry %08x %d\n", ta_entry->tlli, |
| ta_entry->ta); |
| #endif |
| llist_del(&ta_entry->list); |
| talloc_free(ta_entry); |
| count++; |
| } |
| gprs_rlcmac_ta_num = 0; |
| |
| return count; |
| } |
| |