261 lines
8.3 KiB
C++
261 lines
8.3 KiB
C++
/*
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* Copyright (C) 2013 by Holger Hans Peter Freyther
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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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#pragma once
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#include "gprs_rlcmac.h"
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#include <stdint.h>
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struct bssgp_bvc_ctx;
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/*
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* TBF instance
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*/
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#define LLC_MAX_LEN 1543
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#define RLC_MAX_SNS 128 /* GPRS, must be power of 2 */
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#define RLC_MAX_WS 64 /* max window size */
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#define RLC_MAX_LEN 54 /* CS-4 including spare bits */
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#define Tassign_agch 0,200000 /* waiting after IMM.ASS confirm */
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#define Tassign_pacch 2,0 /* timeout for pacch assigment */
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enum gprs_rlcmac_tbf_state {
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GPRS_RLCMAC_NULL = 0, /* new created TBF */
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GPRS_RLCMAC_ASSIGN, /* wait for downlink assignment */
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GPRS_RLCMAC_FLOW, /* RLC/MAC flow, resource needed */
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GPRS_RLCMAC_FINISHED, /* flow finished, wait for release */
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GPRS_RLCMAC_WAIT_RELEASE,/* wait for release or restart of DL TBF */
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GPRS_RLCMAC_RELEASING, /* releasing, wait to free TBI/USF */
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};
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enum gprs_rlcmac_tbf_poll_state {
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GPRS_RLCMAC_POLL_NONE = 0,
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GPRS_RLCMAC_POLL_SCHED, /* a polling was scheduled */
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};
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enum gprs_rlcmac_tbf_dl_ass_state {
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GPRS_RLCMAC_DL_ASS_NONE = 0,
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GPRS_RLCMAC_DL_ASS_SEND_ASS, /* send downlink assignment on next RTS */
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GPRS_RLCMAC_DL_ASS_WAIT_ACK, /* wait for PACKET CONTROL ACK */
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};
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enum gprs_rlcmac_tbf_ul_ass_state {
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GPRS_RLCMAC_UL_ASS_NONE = 0,
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GPRS_RLCMAC_UL_ASS_SEND_ASS, /* send uplink assignment on next RTS */
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GPRS_RLCMAC_UL_ASS_WAIT_ACK, /* wait for PACKET CONTROL ACK */
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};
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enum gprs_rlcmac_tbf_ul_ack_state {
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GPRS_RLCMAC_UL_ACK_NONE = 0,
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GPRS_RLCMAC_UL_ACK_SEND_ACK, /* send acknowledge on next RTS */
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GPRS_RLCMAC_UL_ACK_WAIT_ACK, /* wait for PACKET CONTROL ACK */
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};
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enum gprs_rlcmac_tbf_direction {
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GPRS_RLCMAC_DL_TBF,
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GPRS_RLCMAC_UL_TBF
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};
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#define GPRS_RLCMAC_FLAG_CCCH 0 /* assignment on CCCH */
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#define GPRS_RLCMAC_FLAG_PACCH 1 /* assignment on PACCH */
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#define GPRS_RLCMAC_FLAG_UL_DATA 2 /* uplink data received */
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#define GPRS_RLCMAC_FLAG_DL_ACK 3 /* downlink acknowledge received */
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#define GPRS_RLCMAC_FLAG_TO_UL_ACK 4
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#define GPRS_RLCMAC_FLAG_TO_DL_ACK 5
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#define GPRS_RLCMAC_FLAG_TO_UL_ASS 6
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#define GPRS_RLCMAC_FLAG_TO_DL_ASS 7
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#define GPRS_RLCMAC_FLAG_TO_MASK 0xf0 /* timeout bits */
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struct gprs_rlcmac_tbf {
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static void free_all(struct gprs_rlcmac_trx *trx);
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static void free_all(struct gprs_rlcmac_pdch *pdch);
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bool state_is(enum gprs_rlcmac_tbf_state rhs) const;
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bool state_is_not(enum gprs_rlcmac_tbf_state rhs) const;
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void set_state(enum gprs_rlcmac_tbf_state new_state);
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/* TODO: add the gettimeofday as parameter */
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struct msgb *llc_dequeue(bssgp_bvc_ctx *bctx);
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void update_llc_frame(struct msgb *msg);
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/* TODO: extract LLC class? */
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int assemble_forward_llc(uint8_t *data, uint8_t len);
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struct msgb *create_dl_ass(uint32_t fn);
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struct msgb *create_ul_ass(uint32_t fn);
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struct msgb *create_ul_ack(uint32_t fn);
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int snd_dl_ack(uint8_t final, uint8_t ssn, uint8_t *rbb);
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int rlcmac_diag();
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int update();
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void handle_timeout();
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void stop_timer();
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void stop_t3191();
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void poll_timeout();
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struct llist_head list;
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uint32_t state_flags;
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enum gprs_rlcmac_tbf_direction direction;
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uint8_t tfi;
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uint32_t tlli;
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uint8_t tlli_valid;
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struct gprs_rlcmac_trx *trx;
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uint8_t trx_no;
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uint16_t arfcn;
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uint8_t tsc;
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uint8_t first_ts; /* first TS used by TBF */
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uint8_t first_common_ts; /* first TS that the phone can send and
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reveive simultaniously */
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uint8_t control_ts; /* timeslot control messages and polling */
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uint8_t ms_class;
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struct gprs_rlcmac_pdch *pdch[8]; /* list of PDCHs allocated to TBF */
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uint16_t ta;
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uint8_t llc_frame[LLC_MAX_LEN]; /* current DL or UL frame */
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uint16_t llc_index; /* current write/read position of frame */
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uint16_t llc_length; /* len of current DL LLC_frame, 0 == no frame */
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struct llist_head llc_queue; /* queued LLC DL data */
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enum gprs_rlcmac_tbf_dl_ass_state dl_ass_state;
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enum gprs_rlcmac_tbf_ul_ass_state ul_ass_state;
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enum gprs_rlcmac_tbf_ul_ack_state ul_ack_state;
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enum gprs_rlcmac_tbf_poll_state poll_state;
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uint32_t poll_fn; /* frame number to poll */
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uint16_t ws; /* window size */
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uint16_t sns; /* sequence number space */
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/* Please note that all variables here will be reset when changing
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* from WAIT RELEASE back to FLOW state (re-use of TBF).
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* All states that need reset must be in this struct, so this is why
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* variables are in both (dl and ul) structs and not outside union.
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*/
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union {
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struct {
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uint16_t bsn; /* block sequence number */
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uint16_t v_s; /* send state */
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uint16_t v_a; /* ack state */
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char v_b[RLC_MAX_SNS/2]; /* acknowledge state array */
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int32_t tx_counter; /* count all transmitted blocks */
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char imsi[16]; /* store IMSI for PCH retransmission */
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uint8_t wait_confirm; /* wait for CCCH IMM.ASS cnf */
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} dl;
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struct {
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uint16_t bsn; /* block sequence number */
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uint16_t v_r; /* receive state */
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uint16_t v_q; /* receive window state */
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char v_n[RLC_MAX_SNS/2]; /* receive state array */
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int32_t rx_counter; /* count all received blocks */
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uint8_t n3103; /* N3103 counter */
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uint8_t usf[8]; /* list USFs per PDCH (timeslot) */
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uint8_t contention_resolution_done; /* set after done */
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uint8_t final_ack_sent; /* set if we sent final ack */
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} ul;
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} dir;
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uint8_t rlc_block[RLC_MAX_SNS/2][RLC_MAX_LEN]; /* block history */
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uint8_t rlc_block_len[RLC_MAX_SNS/2]; /* block len of history */
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uint8_t n3105; /* N3105 counter */
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struct osmo_timer_list timer;
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unsigned int T; /* Txxxx number */
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unsigned int num_T_exp; /* number of consecutive T expirations */
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struct osmo_gsm_timer_list gsm_timer;
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unsigned int fT; /* fTxxxx number */
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unsigned int num_fT_exp; /* number of consecutive fT expirations */
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struct {
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char imsi[16];
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struct timeval dl_bw_tv; /* timestamp for dl bw calculation */
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uint32_t dl_bw_octets; /* number of octets since bw_tv */
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struct timeval rssi_tv; /* timestamp for rssi calculation */
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int32_t rssi_sum; /* sum of rssi values */
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int rssi_num; /* number of rssi values added since rssi_tv */
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struct timeval dl_loss_tv; /* timestamp for loss calculation */
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uint16_t dl_loss_lost; /* sum of lost packets */
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uint16_t dl_loss_received; /* sum of received packets */
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} meas;
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uint8_t cs; /* current coding scheme */
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#ifdef DEBUG_DIAGRAM
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int diag; /* number where TBF is presented in diagram */
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int diag_new; /* used to format output of new TBF */
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#endif
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/* these should become protected but only after gprs_rlcmac_data.c
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* stops to iterate over all tbf in its current form */
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enum gprs_rlcmac_tbf_state state;
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/* store the BTS this TBF belongs to */
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BTS *bts;
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protected:
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gprs_rlcmac_bts *bts_data() const;
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};
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/* dispatch Unitdata.DL messages */
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int tbf_handle(struct gprs_rlcmac_bts *bts,
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const uint32_t tlli, const char *imsi, const uint8_t ms_class,
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const uint16_t delay_csec, const uint8_t *data, const uint16_t len);
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struct gprs_rlcmac_tbf *tbf_alloc_ul(struct gprs_rlcmac_bts *bts,
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int8_t use_trx, uint8_t ms_class,
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uint32_t tlli, uint8_t ta, struct gprs_rlcmac_tbf *dl_tbf);
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struct gprs_rlcmac_tbf *tbf_alloc(struct gprs_rlcmac_bts *bts,
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struct gprs_rlcmac_tbf *old_tbf,
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enum gprs_rlcmac_tbf_direction dir, uint8_t tfi, uint8_t trx,
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uint8_t ms_class, uint8_t single_slot);
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void tbf_free(struct gprs_rlcmac_tbf *tbf);
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int tbf_assign_control_ts(struct gprs_rlcmac_tbf *tbf);
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void tbf_new_state(struct gprs_rlcmac_tbf *tbf,
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enum gprs_rlcmac_tbf_state state);
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void tbf_timer_start(struct gprs_rlcmac_tbf *tbf, unsigned int T,
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unsigned int seconds, unsigned int microseconds);
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inline bool gprs_rlcmac_tbf::state_is(enum gprs_rlcmac_tbf_state rhs) const
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{
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return state == rhs;
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}
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inline bool gprs_rlcmac_tbf::state_is_not(enum gprs_rlcmac_tbf_state rhs) const
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{
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return state != rhs;
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}
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inline void gprs_rlcmac_tbf::set_state(enum gprs_rlcmac_tbf_state new_state)
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{
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state = new_state;
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}
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