diff options
author | Holger Hans Peter Freyther <holger@moiji-mobile.com> | 2013-10-26 21:38:30 +0200 |
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committer | Holger Hans Peter Freyther <holger@moiji-mobile.com> | 2013-10-30 21:24:12 +0100 |
commit | 3dc56a3b341ffd22a7a5951a5ec6f78163fdc800 (patch) | |
tree | a44ced0e030c014f118b608faed953696e92cc99 /src/tbf.cpp | |
parent | ae03f22199fb93b104411f113e93134cf11d1bb2 (diff) |
tbf: Move gprs_rlcmac_send_packet_uplink_assignment into the tbf
Diffstat (limited to 'src/tbf.cpp')
-rw-r--r-- | src/tbf.cpp | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/src/tbf.cpp b/src/tbf.cpp index c640c8d2..08f6cf38 100644 --- a/src/tbf.cpp +++ b/src/tbf.cpp @@ -25,6 +25,7 @@ #include <encoding.h> #include <gprs_rlcmac.h> #include <gprs_debug.h> +#include <gprs_bssgp_pcu.h> extern "C" { #include <osmocom/core/msgb.h> @@ -1099,6 +1100,145 @@ struct msgb *gprs_rlcmac_tbf::create_ul_ack(uint32_t fn) return msg; } +int gprs_rlcmac_tbf::snd_dl_ack(uint8_t final, uint8_t ssn, uint8_t *rbb) +{ + char show_rbb[65], show_v_b[RLC_MAX_SNS + 1]; + uint16_t mod_sns = sns - 1; + uint16_t mod_sns_half = (sns >> 1) - 1; + int i; /* must be signed */ + int16_t dist; /* must be signed */ + uint8_t bit; + uint16_t bsn; + struct msgb *msg; + uint16_t lost = 0, received = 0; + + LOGP(DRLCMACDL, LOGL_DEBUG, "TBF=%d downlink acknowledge\n", 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 = (dir.dl.v_s - ssn) & mod_sns; + /* check if distance is less than distance V(A)..V(S) */ + if (dist >= ((dir.dl.v_s - dir.dl.v_a) & mod_sns)) { + /* 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", tfi); + return 1; /* indicate to free TBF */ + } + /* SSN - 1 is in range V(A)..V(S)-1 */ + for (i = 63, bsn = (ssn - 1) & mod_sns; + i >= 0 && bsn != ((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); + if (dir.dl.v_b[bsn & mod_sns_half] + != 'A') + received++; + dir.dl.v_b[bsn & mod_sns_half] = 'A'; + } else { + LOGP(DRLCMACDL, LOGL_DEBUG, "- got " + "NACK for BSN=%d\n", bsn); + dir.dl.v_b[bsn & mod_sns_half] = 'N'; + lost++; + } + } + /* report lost and received packets */ + gprs_rlcmac_received_lost(this, received, lost); + + /* raise V(A), if possible */ + for (i = 0, bsn = dir.dl.v_a; bsn != dir.dl.v_s; + i++, bsn = (bsn + 1) & mod_sns) { + if (dir.dl.v_b[bsn & mod_sns_half] == 'A') { + dir.dl.v_b[bsn & mod_sns_half] = 'I'; + /* mark invalid */ + dir.dl.v_a = (dir.dl.v_a + 1) + & mod_sns; + } else + break; + } + + /* show receive state array in debug (V(A)..V(S)-1) */ + for (i = 0, bsn = dir.dl.v_a; bsn != dir.dl.v_s; + i++, bsn = (bsn + 1) & mod_sns) { + show_v_b[i] = 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", dir.dl.v_a, show_v_b, + (dir.dl.v_s - 1) & mod_sns); + + if (state_is(GPRS_RLCMAC_FINISHED) + && dir.dl.v_s == dir.dl.v_a) { + LOGP(DRLCMACDL, LOGL_NOTICE, "Received acknowledge of " + "all blocks, but without final ack " + "inidcation (don't worry)\n"); + } + return 0; + } + + LOGP(DRLCMACDL, LOGL_DEBUG, "- Final ACK received.\n"); + debug_diagram(ts, diag, "got Final ACK"); + /* range V(A)..V(S)-1 */ + for (bsn = dir.dl.v_a; bsn != dir.dl.v_s; + bsn = (bsn + 1) & mod_sns) { + if (dir.dl.v_b[bsn & mod_sns_half] != 'A') + received++; + } + + /* report all outstanding packets as received */ + gprs_rlcmac_received_lost(this, received, lost); + + /* check for LLC PDU in the LLC Queue */ + msg = llc_dequeue(gprs_bssgp_pcu_current_bctx()); + if (!msg) { + /* no message, start T3193, change state to RELEASE */ + LOGP(DRLCMACDL, LOGL_DEBUG, "- No new message, so we " + "release.\n"); + /* start T3193 */ + debug_diagram(bts, diag, "start T3193"); + tbf_timer_start(this, 3193, + bts_data()->t3193_msec / 1000, + (bts_data()->t3193_msec % 1000) * 1000); + tbf_new_state(this, GPRS_RLCMAC_WAIT_RELEASE); + + return 0; + } + #warning "Copy and paste on the sender path" + update_llc_frame(msg); + 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(&dir.dl, 0, sizeof(dir.dl)); /* reset RLC states */ + state_flags &= GPRS_RLCMAC_FLAG_TO_MASK; /* keep TO flags */ + state_flags &= ~(1 << GPRS_RLCMAC_FLAG_CCCH); + update(); + bts->trigger_dl_ass(this, this, NULL); + return 0; +} + void gprs_rlcmac_tbf::free_all(struct gprs_rlcmac_trx *trx) { for (uint8_t tfi = 0; tfi < 32; tfi++) { |