Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 1 | /* Copied from tbf.cpp |
| 2 | * |
| 3 | * Copyright (C) 2012 Ivan Klyuchnikov |
| 4 | * Copyright (C) 2012 Andreas Eversberg <jolly@eversberg.eu> |
| 5 | * Copyright (C) 2013 by Holger Hans Peter Freyther |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License |
| 9 | * as published by the Free Software Foundation; either version 2 |
| 10 | * of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 16 | */ |
| 17 | |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 18 | |
Holger Hans Peter Freyther | 857281f | 2013-11-13 14:56:55 +0100 | [diff] [blame] | 19 | #include <stdio.h> |
| 20 | |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 21 | #include <osmocom/core/msgb.h> |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 22 | |
Pau Espin Pedrol | 4f8384b | 2022-03-31 19:36:12 +0200 | [diff] [blame] | 23 | #include "bts.h" |
Pau Espin Pedrol | 6b1e951 | 2022-04-04 13:45:56 +0200 | [diff] [blame] | 24 | #include "gprs_ms.h" |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 25 | #include "pcu_utils.h" |
Pau Espin Pedrol | 4f8384b | 2022-03-31 19:36:12 +0200 | [diff] [blame] | 26 | #include "llc.h" |
| 27 | |
| 28 | void llc_init(struct gprs_llc *llc) |
| 29 | { |
| 30 | llc_reset(llc); |
| 31 | } |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 32 | |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 33 | /* reset LLC frame */ |
Pau Espin Pedrol | 4f8384b | 2022-03-31 19:36:12 +0200 | [diff] [blame] | 34 | void llc_reset(struct gprs_llc *llc) |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 35 | { |
Pau Espin Pedrol | 4f8384b | 2022-03-31 19:36:12 +0200 | [diff] [blame] | 36 | llc->index = 0; |
| 37 | llc->length = 0; |
Holger Hans Peter Freyther | a42b2ad | 2013-11-26 16:39:47 +0100 | [diff] [blame] | 38 | |
Pau Espin Pedrol | 4f8384b | 2022-03-31 19:36:12 +0200 | [diff] [blame] | 39 | memset(llc->frame, 0x42, sizeof(llc->frame)); |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 40 | } |
| 41 | |
Pau Espin Pedrol | 4f8384b | 2022-03-31 19:36:12 +0200 | [diff] [blame] | 42 | void llc_reset_frame_space(struct gprs_llc *llc) |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 43 | { |
Pau Espin Pedrol | 4f8384b | 2022-03-31 19:36:12 +0200 | [diff] [blame] | 44 | llc->index = 0; |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 45 | } |
| 46 | |
Jacob Erlbeck | 612e93e | 2015-03-20 13:57:27 +0100 | [diff] [blame] | 47 | /* Put an Unconfirmed Information (UI) Dummy command, see GSM 44.064, 6.4.2.2 */ |
Pau Espin Pedrol | 4f8384b | 2022-03-31 19:36:12 +0200 | [diff] [blame] | 48 | void llc_put_dummy_frame(struct gprs_llc *llc, size_t req_len) |
Jacob Erlbeck | 612e93e | 2015-03-20 13:57:27 +0100 | [diff] [blame] | 49 | { |
| 50 | /* The shortest dummy command (the spec requests at least 6 octets) */ |
| 51 | static const uint8_t llc_dummy_command[] = { |
| 52 | 0x43, 0xc0, 0x01, 0x2b, 0x2b, 0x2b |
| 53 | }; |
Jacob Erlbeck | 3db617f | 2015-07-07 13:43:44 +0200 | [diff] [blame] | 54 | static const size_t max_dummy_command_len = 79; |
Jacob Erlbeck | 612e93e | 2015-03-20 13:57:27 +0100 | [diff] [blame] | 55 | |
Pau Espin Pedrol | 4f8384b | 2022-03-31 19:36:12 +0200 | [diff] [blame] | 56 | llc_put_frame(llc, llc_dummy_command, sizeof(llc_dummy_command)); |
Jacob Erlbeck | 612e93e | 2015-03-20 13:57:27 +0100 | [diff] [blame] | 57 | |
| 58 | if (req_len > max_dummy_command_len) |
| 59 | req_len = max_dummy_command_len; |
| 60 | |
| 61 | /* Add further stuffing, if the requested length exceeds the minimum |
| 62 | * dummy command length */ |
Pau Espin Pedrol | 4f8384b | 2022-03-31 19:36:12 +0200 | [diff] [blame] | 63 | if (llc->length < req_len) { |
| 64 | memset(&llc->frame[llc->length], 0x2b, req_len - llc->length); |
| 65 | llc->length = req_len; |
Pau Espin Pedrol | a70bf72 | 2021-03-02 12:28:32 +0100 | [diff] [blame] | 66 | } |
Jacob Erlbeck | 612e93e | 2015-03-20 13:57:27 +0100 | [diff] [blame] | 67 | } |
| 68 | |
Pau Espin Pedrol | 4f8384b | 2022-03-31 19:36:12 +0200 | [diff] [blame] | 69 | void llc_put_frame(struct gprs_llc *llc, const uint8_t *data, size_t len) |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 70 | { |
Holger Hans Peter Freyther | 857281f | 2013-11-13 14:56:55 +0100 | [diff] [blame] | 71 | /* only put frames when we are empty */ |
Pau Espin Pedrol | 4f8384b | 2022-03-31 19:36:12 +0200 | [diff] [blame] | 72 | OSMO_ASSERT(llc->index == 0 && llc->length == 0); |
| 73 | llc_append_frame(llc, data, len); |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 74 | } |
Holger Hans Peter Freyther | 857281f | 2013-11-13 14:56:55 +0100 | [diff] [blame] | 75 | |
Pau Espin Pedrol | 4f8384b | 2022-03-31 19:36:12 +0200 | [diff] [blame] | 76 | void llc_append_frame(struct gprs_llc *llc, const uint8_t *data, size_t len) |
Holger Hans Peter Freyther | e231026 | 2013-11-13 16:56:15 +0100 | [diff] [blame] | 77 | { |
Holger Hans Peter Freyther | 857281f | 2013-11-13 14:56:55 +0100 | [diff] [blame] | 78 | /* TODO: bounds check */ |
Pau Espin Pedrol | 4f8384b | 2022-03-31 19:36:12 +0200 | [diff] [blame] | 79 | memcpy(llc->frame + llc->length, data, len); |
| 80 | llc->length += len; |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 81 | } |
| 82 | |
Pau Espin Pedrol | 1111aa1 | 2023-01-26 15:09:48 +0100 | [diff] [blame] | 83 | static bool llc_pdu_can_be_discarded(const uint8_t *data, size_t len) |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 84 | { |
Pau Espin Pedrol | 1111aa1 | 2023-01-26 15:09:48 +0100 | [diff] [blame] | 85 | const unsigned keep_small_thresh = 60; |
| 86 | |
| 87 | /* Is the frame small, perhaps only a TCP ACK? */ |
| 88 | if (len <= keep_small_thresh) |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 89 | return false; |
| 90 | |
| 91 | if ((data[0] & 0x0f) == 1 /* GPRS_SAPI_GMM */) |
| 92 | return false; |
| 93 | |
Jacob Erlbeck | d0aee85 | 2015-06-11 11:47:06 +0200 | [diff] [blame] | 94 | if ((data[0] & 0xe0) != 0xc0 /* LLC UI */) |
| 95 | /* It is not an LLC UI frame, see TS 44.064, 6.3 */ |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 96 | return false; |
| 97 | |
| 98 | return true; |
| 99 | } |
| 100 | |
Pau Espin Pedrol | 6b1e951 | 2022-04-04 13:45:56 +0200 | [diff] [blame] | 101 | void llc_queue_init(struct gprs_llc_queue *q, struct GprsMs *ms) |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 102 | { |
Pau Espin Pedrol | 5c598c7 | 2022-03-31 20:22:05 +0200 | [diff] [blame] | 103 | unsigned int i; |
| 104 | |
Pau Espin Pedrol | 6b1e951 | 2022-04-04 13:45:56 +0200 | [diff] [blame] | 105 | q->ms = ms; |
Pau Espin Pedrol | 1463383 | 2022-03-31 19:08:07 +0200 | [diff] [blame] | 106 | q->queue_size = 0; |
| 107 | q->queue_octets = 0; |
| 108 | q->avg_queue_delay = 0; |
Pau Espin Pedrol | 6b1e951 | 2022-04-04 13:45:56 +0200 | [diff] [blame] | 109 | for (i = 0; i < ARRAY_SIZE(q->pq); i++) { |
| 110 | INIT_LLIST_HEAD(&q->pq[i].queue); |
| 111 | gprs_codel_init(&q->pq[i].codel_state); |
| 112 | } |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 113 | } |
| 114 | |
Pau Espin Pedrol | 6b1e951 | 2022-04-04 13:45:56 +0200 | [diff] [blame] | 115 | /* interval=0 -> don't use codel in the LLC queue */ |
| 116 | void llc_queue_set_codel_interval(struct gprs_llc_queue *q, unsigned int interval) |
| 117 | { |
| 118 | unsigned int i; |
| 119 | if (interval == LLC_CODEL_DISABLE) { |
| 120 | q->use_codel = false; |
| 121 | return; |
| 122 | } |
| 123 | q->use_codel = true; |
| 124 | for (i = 0; i < ARRAY_SIZE(q->pq); i++) |
| 125 | gprs_codel_set_interval(&q->pq[i].codel_state, interval); |
| 126 | } |
Pau Espin Pedrol | 5fc6e01 | 2020-02-26 20:05:33 +0100 | [diff] [blame] | 127 | |
Pau Espin Pedrol | 5c598c7 | 2022-03-31 20:22:05 +0200 | [diff] [blame] | 128 | static enum gprs_llc_queue_prio llc_sapi2prio(uint8_t sapi) |
| 129 | { |
| 130 | switch (sapi) { |
| 131 | case 1: |
| 132 | return LLC_QUEUE_PRIO_GMM; |
| 133 | case 2: |
| 134 | case 7: |
| 135 | case 8: |
| 136 | return LLC_QUEUE_PRIO_TOM_SMS; |
| 137 | default: |
| 138 | return LLC_QUEUE_PRIO_OTHER; |
| 139 | } |
| 140 | } |
| 141 | |
Pau Espin Pedrol | 4f8384b | 2022-03-31 19:36:12 +0200 | [diff] [blame] | 142 | void llc_queue_enqueue(struct gprs_llc_queue *q, struct msgb *llc_msg, const struct timespec *expire_time) |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 143 | { |
Pau Espin Pedrol | 4f8384b | 2022-03-31 19:36:12 +0200 | [diff] [blame] | 144 | struct MetaInfo *meta_storage; |
Pau Espin Pedrol | 5c598c7 | 2022-03-31 20:22:05 +0200 | [diff] [blame] | 145 | struct gprs_llc_hdr *llc_hdr = (struct gprs_llc_hdr *)msgb_data(llc_msg); |
| 146 | enum gprs_llc_queue_prio prio; |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 147 | |
Pau Espin Pedrol | 5fc6e01 | 2020-02-26 20:05:33 +0100 | [diff] [blame] | 148 | osmo_static_assert(sizeof(*meta_storage) <= sizeof(llc_msg->cb), info_does_not_fit); |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 149 | |
Pau Espin Pedrol | 5c598c7 | 2022-03-31 20:22:05 +0200 | [diff] [blame] | 150 | prio = llc_sapi2prio(llc_hdr->sapi); |
| 151 | |
Pau Espin Pedrol | 4f8384b | 2022-03-31 19:36:12 +0200 | [diff] [blame] | 152 | q->queue_size += 1; |
| 153 | q->queue_octets += msgb_length(llc_msg); |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 154 | |
Pau Espin Pedrol | 4f8384b | 2022-03-31 19:36:12 +0200 | [diff] [blame] | 155 | meta_storage = (struct MetaInfo *)&llc_msg->cb[0]; |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 156 | osmo_clock_gettime(CLOCK_MONOTONIC, &meta_storage->recv_time); |
Pau Espin Pedrol | 5fc6e01 | 2020-02-26 20:05:33 +0100 | [diff] [blame] | 157 | meta_storage->expire_time = *expire_time; |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 158 | |
Pau Espin Pedrol | 6b1e951 | 2022-04-04 13:45:56 +0200 | [diff] [blame] | 159 | msgb_enqueue(&q->pq[prio].queue, llc_msg); |
Jacob Erlbeck | 6dbe822 | 2015-05-29 10:37:09 +0200 | [diff] [blame] | 160 | } |
| 161 | |
Pau Espin Pedrol | 2182e62 | 2021-01-14 16:48:38 +0100 | [diff] [blame] | 162 | void llc_queue_clear(struct gprs_llc_queue *q, struct gprs_rlcmac_bts *bts) |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 163 | { |
| 164 | struct msgb *msg; |
Pau Espin Pedrol | 5c598c7 | 2022-03-31 20:22:05 +0200 | [diff] [blame] | 165 | unsigned int i; |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 166 | |
Pau Espin Pedrol | 6b1e951 | 2022-04-04 13:45:56 +0200 | [diff] [blame] | 167 | for (i = 0; i < ARRAY_SIZE(q->pq); i++) { |
| 168 | while ((msg = msgb_dequeue(&q->pq[i].queue))) { |
Pau Espin Pedrol | 5c598c7 | 2022-03-31 20:22:05 +0200 | [diff] [blame] | 169 | if (bts) |
| 170 | bts_do_rate_ctr_inc(bts, CTR_LLC_FRAME_DROPPED); |
| 171 | msgb_free(msg); |
| 172 | } |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 173 | } |
Holger Hans Peter Freyther | 550bb88 | 2013-12-04 17:10:54 +0100 | [diff] [blame] | 174 | |
Pau Espin Pedrol | 1463383 | 2022-03-31 19:08:07 +0200 | [diff] [blame] | 175 | q->queue_size = 0; |
| 176 | q->queue_octets = 0; |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 177 | } |
| 178 | |
Pau Espin Pedrol | da971ee | 2020-12-16 15:59:45 +0100 | [diff] [blame] | 179 | void llc_queue_move_and_merge(struct gprs_llc_queue *q, struct gprs_llc_queue *o) |
Jacob Erlbeck | 257b630 | 2015-08-21 18:07:47 +0200 | [diff] [blame] | 180 | { |
| 181 | struct msgb *msg, *msg1 = NULL, *msg2 = NULL; |
| 182 | struct llist_head new_queue; |
Pau Espin Pedrol | 5c598c7 | 2022-03-31 20:22:05 +0200 | [diff] [blame] | 183 | unsigned int i; |
Jacob Erlbeck | 257b630 | 2015-08-21 18:07:47 +0200 | [diff] [blame] | 184 | size_t queue_size = 0; |
| 185 | size_t queue_octets = 0; |
| 186 | INIT_LLIST_HEAD(&new_queue); |
| 187 | |
Pau Espin Pedrol | 6b1e951 | 2022-04-04 13:45:56 +0200 | [diff] [blame] | 188 | for (i = 0; i < ARRAY_SIZE(q->pq); i++) { |
Pau Espin Pedrol | 5c598c7 | 2022-03-31 20:22:05 +0200 | [diff] [blame] | 189 | while (1) { |
| 190 | if (msg1 == NULL) |
Pau Espin Pedrol | 6b1e951 | 2022-04-04 13:45:56 +0200 | [diff] [blame] | 191 | msg1 = msgb_dequeue(&q->pq[i].queue); |
Jacob Erlbeck | 257b630 | 2015-08-21 18:07:47 +0200 | [diff] [blame] | 192 | |
Pau Espin Pedrol | 5c598c7 | 2022-03-31 20:22:05 +0200 | [diff] [blame] | 193 | if (msg2 == NULL) |
Pau Espin Pedrol | 6b1e951 | 2022-04-04 13:45:56 +0200 | [diff] [blame] | 194 | msg2 = msgb_dequeue(&o->pq[i].queue); |
Jacob Erlbeck | 257b630 | 2015-08-21 18:07:47 +0200 | [diff] [blame] | 195 | |
Pau Espin Pedrol | 5c598c7 | 2022-03-31 20:22:05 +0200 | [diff] [blame] | 196 | if (msg1 == NULL && msg2 == NULL) |
| 197 | break; |
Jacob Erlbeck | 257b630 | 2015-08-21 18:07:47 +0200 | [diff] [blame] | 198 | |
Pau Espin Pedrol | 5c598c7 | 2022-03-31 20:22:05 +0200 | [diff] [blame] | 199 | if (msg1 == NULL) { |
| 200 | msg = msg2; |
| 201 | msg2 = NULL; |
| 202 | } else if (msg2 == NULL) { |
Jacob Erlbeck | 257b630 | 2015-08-21 18:07:47 +0200 | [diff] [blame] | 203 | msg = msg1; |
| 204 | msg1 = NULL; |
| 205 | } else { |
Pau Espin Pedrol | 5c598c7 | 2022-03-31 20:22:05 +0200 | [diff] [blame] | 206 | const struct MetaInfo *mi1 = (struct MetaInfo *)&msg1->cb[0]; |
| 207 | const struct MetaInfo *mi2 = (struct MetaInfo *)&msg2->cb[0]; |
| 208 | |
| 209 | if (timespeccmp(&mi2->recv_time, &mi1->recv_time, >)) { |
| 210 | msg = msg1; |
| 211 | msg1 = NULL; |
| 212 | } else { |
| 213 | msg = msg2; |
| 214 | msg2 = NULL; |
| 215 | } |
Jacob Erlbeck | 257b630 | 2015-08-21 18:07:47 +0200 | [diff] [blame] | 216 | } |
Pau Espin Pedrol | 5c598c7 | 2022-03-31 20:22:05 +0200 | [diff] [blame] | 217 | |
| 218 | msgb_enqueue(&new_queue, msg); |
| 219 | queue_size += 1; |
| 220 | queue_octets += msgb_length(msg); |
Jacob Erlbeck | 257b630 | 2015-08-21 18:07:47 +0200 | [diff] [blame] | 221 | } |
| 222 | |
Pau Espin Pedrol | 6b1e951 | 2022-04-04 13:45:56 +0200 | [diff] [blame] | 223 | OSMO_ASSERT(llist_empty(&q->pq[i].queue)); |
| 224 | OSMO_ASSERT(llist_empty(&o->pq[i].queue)); |
| 225 | llist_splice_init(&new_queue, &q->pq[i].queue); |
Jacob Erlbeck | 257b630 | 2015-08-21 18:07:47 +0200 | [diff] [blame] | 226 | } |
| 227 | |
Pau Espin Pedrol | 1463383 | 2022-03-31 19:08:07 +0200 | [diff] [blame] | 228 | o->queue_size = 0; |
| 229 | o->queue_octets = 0; |
Pau Espin Pedrol | 1463383 | 2022-03-31 19:08:07 +0200 | [diff] [blame] | 230 | q->queue_size = queue_size; |
| 231 | q->queue_octets = queue_octets; |
Jacob Erlbeck | 257b630 | 2015-08-21 18:07:47 +0200 | [diff] [blame] | 232 | } |
| 233 | |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 234 | #define ALPHA 0.5f |
| 235 | |
Pau Espin Pedrol | 6b1e951 | 2022-04-04 13:45:56 +0200 | [diff] [blame] | 236 | static struct msgb *llc_queue_pick_msg(struct gprs_llc_queue *q, enum gprs_llc_queue_prio *prio) |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 237 | { |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 238 | struct msgb *msg; |
Pau Espin Pedrol | e0a8488 | 2023-01-26 18:20:08 +0100 | [diff] [blame] | 239 | struct timespec tv_now, tv_result; |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 240 | uint32_t lifetime; |
Pau Espin Pedrol | 5c598c7 | 2022-03-31 20:22:05 +0200 | [diff] [blame] | 241 | unsigned int i; |
Pau Espin Pedrol | 4f8384b | 2022-03-31 19:36:12 +0200 | [diff] [blame] | 242 | const struct MetaInfo *meta_storage; |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 243 | |
Pau Espin Pedrol | 6b1e951 | 2022-04-04 13:45:56 +0200 | [diff] [blame] | 244 | for (i = 0; i < ARRAY_SIZE(q->pq); i++) { |
| 245 | if ((msg = msgb_dequeue(&q->pq[i].queue))) { |
| 246 | *prio = (enum gprs_llc_queue_prio)i; |
Pau Espin Pedrol | 5c598c7 | 2022-03-31 20:22:05 +0200 | [diff] [blame] | 247 | break; |
Pau Espin Pedrol | 6b1e951 | 2022-04-04 13:45:56 +0200 | [diff] [blame] | 248 | } |
Pau Espin Pedrol | 5c598c7 | 2022-03-31 20:22:05 +0200 | [diff] [blame] | 249 | } |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 250 | if (!msg) |
| 251 | return NULL; |
| 252 | |
Pau Espin Pedrol | 4f8384b | 2022-03-31 19:36:12 +0200 | [diff] [blame] | 253 | meta_storage = (struct MetaInfo *)&msg->cb[0]; |
Jacob Erlbeck | b671dbf | 2015-06-15 14:32:33 +0200 | [diff] [blame] | 254 | |
Pau Espin Pedrol | 4f8384b | 2022-03-31 19:36:12 +0200 | [diff] [blame] | 255 | q->queue_size -= 1; |
| 256 | q->queue_octets -= msgb_length(msg); |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 257 | |
| 258 | /* take the second time */ |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 259 | osmo_clock_gettime(CLOCK_MONOTONIC, &tv_now); |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 260 | timespecsub(&tv_now, &meta_storage->recv_time, &tv_result); |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 261 | |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 262 | lifetime = tv_result.tv_sec*1000 + tv_result.tv_nsec/1000000; |
Pau Espin Pedrol | 4f8384b | 2022-03-31 19:36:12 +0200 | [diff] [blame] | 263 | q->avg_queue_delay = q->avg_queue_delay * ALPHA + lifetime * (1-ALPHA); |
Daniel Willmann | 9c62389 | 2013-12-04 18:11:47 +0100 | [diff] [blame] | 264 | |
| 265 | return msg; |
Holger Hans Peter Freyther | 096f6f9 | 2013-11-07 07:21:06 +0100 | [diff] [blame] | 266 | } |
Holger Hans Peter Freyther | fce431c | 2013-11-13 15:17:12 +0100 | [diff] [blame] | 267 | |
Pau Espin Pedrol | 6b1e951 | 2022-04-04 13:45:56 +0200 | [diff] [blame] | 268 | struct msgb *llc_queue_dequeue(struct gprs_llc_queue *q) |
| 269 | { |
| 270 | struct msgb *msg; |
| 271 | struct timespec tv_now, tv_now2; |
| 272 | uint32_t octets = 0, frames = 0; |
| 273 | struct gprs_rlcmac_bts *bts = q->ms->bts; |
| 274 | struct gprs_pcu *pcu = bts->pcu; |
| 275 | struct timespec hyst_delta = {0, 0}; |
Pau Espin Pedrol | 6b1e951 | 2022-04-04 13:45:56 +0200 | [diff] [blame] | 276 | enum gprs_llc_queue_prio prio; |
| 277 | |
| 278 | if (pcu->vty.llc_discard_csec) |
| 279 | csecs_to_timespec(pcu->vty.llc_discard_csec, &hyst_delta); |
| 280 | |
| 281 | osmo_clock_gettime(CLOCK_MONOTONIC, &tv_now); |
| 282 | timespecadd(&tv_now, &hyst_delta, &tv_now2); |
| 283 | |
| 284 | while ((msg = llc_queue_pick_msg(q, &prio))) { |
| 285 | const struct MetaInfo *info = (const struct MetaInfo *)&msg->cb[0]; |
| 286 | const struct timespec *tv_disc = &info->expire_time; |
| 287 | const struct timespec *tv_recv = &info->recv_time; |
| 288 | |
| 289 | gprs_bssgp_update_queue_delay(tv_recv, &tv_now); |
| 290 | |
| 291 | if (q->use_codel) { |
| 292 | int bytes = llc_queue_octets(q); |
| 293 | if (gprs_codel_control(&q->pq[prio].codel_state, tv_recv, &tv_now, bytes)) |
| 294 | goto drop_frame; |
| 295 | } |
| 296 | |
| 297 | /* Is the age below the low water mark? */ |
| 298 | if (!llc_queue_is_frame_expired(&tv_now2, tv_disc)) |
| 299 | break; |
| 300 | |
| 301 | /* Is the age below the high water mark */ |
| 302 | if (!llc_queue_is_frame_expired(&tv_now, tv_disc)) { |
| 303 | /* Has the previous message not been dropped? */ |
| 304 | if (frames == 0) |
| 305 | break; |
| 306 | |
| 307 | /* Hysteresis mode, try to discard LLC messages until |
| 308 | * the low water mark has been reached */ |
| 309 | |
Pau Espin Pedrol | 1111aa1 | 2023-01-26 15:09:48 +0100 | [diff] [blame] | 310 | /* Check whether to abort the hysteresis mode: |
| 311 | * Can the PDU be discarded according to its type? */ |
| 312 | if (!llc_pdu_can_be_discarded(msg->data, msg->len)) |
Pau Espin Pedrol | 6b1e951 | 2022-04-04 13:45:56 +0200 | [diff] [blame] | 313 | break; |
| 314 | } |
| 315 | |
| 316 | bts_do_rate_ctr_inc(bts, CTR_LLC_FRAME_TIMEDOUT); |
| 317 | drop_frame: |
| 318 | frames++; |
| 319 | octets += msg->len; |
| 320 | msgb_free(msg); |
| 321 | bts_do_rate_ctr_inc(bts, CTR_LLC_FRAME_DROPPED); |
| 322 | continue; |
| 323 | } |
| 324 | |
| 325 | if (frames) { |
| 326 | LOGPMS(q->ms, DTBFDL, LOGL_NOTICE, "Discarding LLC PDU " |
| 327 | "because lifetime limit reached, " |
| 328 | "count=%u new_queue_size=%zu\n", |
| 329 | frames, llc_queue_size(q)); |
| 330 | if (frames > 0xff) |
| 331 | frames = 0xff; |
| 332 | if (octets > 0xffffff) |
| 333 | octets = 0xffffff; |
| 334 | if (pcu->bssgp.bctx) |
| 335 | bssgp_tx_llc_discarded(pcu->bssgp.bctx, ms_tlli(q->ms), frames, octets); |
| 336 | } |
| 337 | |
| 338 | return msg; |
| 339 | } |
| 340 | |
Pau Espin Pedrol | 4f8384b | 2022-03-31 19:36:12 +0200 | [diff] [blame] | 341 | void llc_queue_calc_pdu_lifetime(struct gprs_rlcmac_bts *bts, const uint16_t pdu_delay_csec, struct timespec *tv) |
Holger Hans Peter Freyther | fce431c | 2013-11-13 15:17:12 +0100 | [diff] [blame] | 342 | { |
| 343 | uint16_t delay_csec; |
Pau Espin Pedrol | f473ec9 | 2021-01-14 14:45:14 +0100 | [diff] [blame] | 344 | if (bts->pcu->vty.force_llc_lifetime) |
| 345 | delay_csec = bts->pcu->vty.force_llc_lifetime; |
Holger Hans Peter Freyther | fce431c | 2013-11-13 15:17:12 +0100 | [diff] [blame] | 346 | else |
| 347 | delay_csec = pdu_delay_csec; |
| 348 | |
Holger Hans Peter Freyther | 5a7f636 | 2013-11-21 21:59:32 +0100 | [diff] [blame] | 349 | /* keep timestamp at 0 for infinite delay */ |
Holger Hans Peter Freyther | 985fd11 | 2013-11-13 15:19:39 +0100 | [diff] [blame] | 350 | if (delay_csec == 0xffff) { |
| 351 | memset(tv, 0, sizeof(*tv)); |
| 352 | return; |
| 353 | } |
| 354 | |
| 355 | /* calculate timestamp of timeout */ |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 356 | struct timespec now, csec; |
| 357 | osmo_clock_gettime(CLOCK_MONOTONIC, &now); |
| 358 | csecs_to_timespec(delay_csec, &csec); |
Holger Hans Peter Freyther | 51e093b | 2013-11-13 15:35:45 +0100 | [diff] [blame] | 359 | |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 360 | timespecadd(&now, &csec, tv); |
Holger Hans Peter Freyther | fce431c | 2013-11-13 15:17:12 +0100 | [diff] [blame] | 361 | } |
Holger Hans Peter Freyther | b1302b0 | 2013-11-13 17:15:26 +0100 | [diff] [blame] | 362 | |
Pau Espin Pedrol | 4f8384b | 2022-03-31 19:36:12 +0200 | [diff] [blame] | 363 | bool llc_queue_is_frame_expired(const struct timespec *tv_now, const struct timespec *tv) |
Holger Hans Peter Freyther | b1302b0 | 2013-11-13 17:15:26 +0100 | [diff] [blame] | 364 | { |
| 365 | /* Timeout is infinite */ |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 366 | if (tv->tv_sec == 0 && tv->tv_nsec == 0) |
Holger Hans Peter Freyther | b1302b0 | 2013-11-13 17:15:26 +0100 | [diff] [blame] | 367 | return false; |
| 368 | |
Pau Espin Pedrol | 1de6873 | 2020-03-11 14:04:52 +0100 | [diff] [blame] | 369 | return timespeccmp(tv_now, tv, >); |
Holger Hans Peter Freyther | b1302b0 | 2013-11-13 17:15:26 +0100 | [diff] [blame] | 370 | } |