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-rw-r--r--src/lib/rxmwheel.c271
1 files changed, 0 insertions, 271 deletions
diff --git a/src/lib/rxmwheel.c b/src/lib/rxmwheel.c
deleted file mode 100644
index ce7ef8e4..00000000
--- a/src/lib/rxmwheel.c
+++ /dev/null
@@ -1,271 +0,0 @@
-/*
- * Ouroboros - Copyright (C) 2016 - 2020
- *
- * Timerwheel
- *
- * Dimitri Staessens <dimitri.staessens@ugent.be>
- * Sander Vrijders <sander.vrijders@ugent.be>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public License
- * version 2.1 as published by the Free Software Foundation.
- *
- * This library 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
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., http://www.fsf.org/about/contact/.
- */
-
-#include <ouroboros/list.h>
-
-#define RXMQ_S 16 /* defines #slots */
-#define RXMQ_M 24 /* defines max delay */
-#define RXMQ_R (RXMQ_M - RXMQ_S) /* defines resolution */
-#define RXMQ_SLOTS (1 << RXMQ_S)
-#define RXMQ_MAX (1 << RXMQ_M) /* ms */
-
-/* Small inacurracy to avoid slow division by MILLION. */
-#define ts_to_ms(ts) (ts.tv_sec * 1000 + (ts.tv_nsec >> 20))
-#define ts_to_us(ts) (ts.tv_sec * MILLION + (ts.tv_nsec >> 10))
-#define ts_to_slot(ts) ((ts_to_us(ts) >> RXMQ_R) & (RXMQ_SLOTS - 1))
-
-struct rxm {
- struct list_head next;
- uint32_t seqno;
- struct shm_du_buff * sdb;
- uint8_t * head;
- uint8_t * tail;
- time_t t0; /* Time when original was sent (s). */
- size_t mul; /* RTO multiplier. */
- struct frcti * frcti;
-};
-
-struct {
- struct list_head wheel[RXMQ_SLOTS];
-
- size_t prv; /* Last processed slot. */
- pthread_mutex_t lock;
-} rw;
-
-static void rxmwheel_fini(void)
-{
- size_t i;
- struct list_head * p;
- struct list_head * h;
-
- for (i = 0; i < RXMQ_SLOTS; ++i) {
- list_for_each_safe(p, h, &rw.wheel[i]) {
- struct rxm * rxm = list_entry(p, struct rxm, next);
- list_del(&rxm->next);
- free(rxm);
- }
- }
-}
-
-static int rxmwheel_init(void)
-{
- struct timespec now;
- size_t i;
-
- if (pthread_mutex_init(&rw.lock, NULL))
- return -1;
-
- clock_gettime(PTHREAD_COND_CLOCK, &now);
-
- /* Mark the previous timeslot as the last one processed. */
- rw.prv = (ts_to_slot(now) - 1) & (RXMQ_SLOTS - 1);
-
- for (i = 0; i < RXMQ_SLOTS; ++i)
- list_head_init(&rw.wheel[i]);
-
- return 0;
-}
-
-static void rxmwheel_clear(int fd)
-{
- size_t i;
-
- /* FIXME: Add list element to avoid looping over full rxmwheel. */
- pthread_mutex_lock(&rw.lock);
-
- for (i = 0; i < RXMQ_SLOTS; ++i) {
- struct list_head * p;
- struct list_head * h;
-
- list_for_each_safe(p, h, &rw.wheel[i]) {
- struct rxm * r = list_entry(p, struct rxm, next);
- if (r->frcti->fd == fd) {
- list_del(&r->next);
- shm_du_buff_ack(r->sdb);
- ipcp_sdb_release(r->sdb);
- free(r);
- }
- }
- }
-
- pthread_mutex_unlock(&rw.lock);
-}
-
-static void check_probe(struct frcti * frcti,
- uint32_t seqno)
-{
- /* disable rtt probe if this packet */
-
- /* TODO: This should be locked, but lock reversal! */
-
- if (frcti->probe && ((frcti->rttseq + 1) == seqno)) {
- /* Backoff to avoid never updating rtt */
- frcti->srtt_us <<= 1;
- frcti->probe = false;
- }
-}
-
-#define rto(frcti) (frcti->srtt_us + (frcti->mdev_us << 1))
-/* Return fd on r-timer expiry. */
-static int rxmwheel_move(void)
-{
- struct timespec now;
- struct list_head * p;
- struct list_head * h;
- size_t slot;
- size_t i;
-
- clock_gettime(PTHREAD_COND_CLOCK, &now);
-
- slot = ts_to_slot(now);
-
- pthread_mutex_lock(&rw.lock);
-
- for (i = rw.prv; (ssize_t) (i - slot) <= 0; ++i) {
- list_for_each_safe(p, h, &rw.wheel[i]) {
- struct rxm * r;
- struct frct_cr * snd_cr;
- struct frct_cr * rcv_cr;
- size_t rslot;
- time_t newtime;
- ssize_t idx;
- struct shm_du_buff * sdb;
- uint8_t * head;
- struct flow * f;
-
- r = list_entry(p, struct rxm, next);
- list_del(&r->next);
-
- snd_cr = &r->frcti->snd_cr;
- rcv_cr = &r->frcti->rcv_cr;
- /* Has been ack'd, remove. */
- if ((int) (r->seqno - snd_cr->lwe) <= 0) {
- shm_du_buff_ack(r->sdb);
- ipcp_sdb_release(r->sdb);
- free(r);
- continue;
- }
-
- /* Disable using this seqno as rto probe. */
- check_probe(r->frcti, r->seqno);
-
- /* Check for r-timer expiry. */
- if (ts_to_ms(now) - r->t0 > r->frcti->r) {
- int fd = r->frcti->fd;
- pthread_mutex_unlock(&rw.lock);
- shm_du_buff_ack(r->sdb);
- ipcp_sdb_release(r->sdb);
- free(r);
- return fd;
- }
-
- /* Copy the payload, safe rtx in other layers. */
- if (ipcp_sdb_reserve(&sdb, r->tail - r->head)) {
- /* FIXME: reschedule send? */
- int fd = r->frcti->fd;
- pthread_mutex_unlock(&rw.lock);
- shm_du_buff_ack(r->sdb);
- ipcp_sdb_release(r->sdb);
- free(r);
- return fd;
- }
-
- idx = shm_du_buff_get_idx(sdb);
-
- head = shm_du_buff_head(sdb);
- memcpy(head, r->head, r->tail - r->head);
-
- /* Release the old copy. */
- shm_du_buff_ack(r->sdb);
- ipcp_sdb_release(r->sdb);
-
- /* Update ackno and make sure DRF is not set. */
- ((struct frct_pci *) head)->ackno = ntoh32(rcv_cr->lwe);
- ((struct frct_pci *) head)->flags &= ~FRCT_DRF;
-
- f = &ai.flows[r->frcti->fd];
-
- /* Retransmit the copy. */
- if (shm_rbuff_write(f->tx_rb, idx)) {
- ipcp_sdb_release(sdb);
- free(r);
- /* FIXME: reschedule send? */
- continue;
- }
-
- shm_flow_set_notify(f->set, f->flow_id, FLOW_PKT);
-
- /* Reschedule. */
- shm_du_buff_wait_ack(sdb);
-
- r->head = head;
- r->tail = shm_du_buff_tail(sdb);
- r->sdb = sdb;
-
- newtime = ts_to_us(now) + rto(f->frcti);
- rslot = (newtime >> RXMQ_R) & (RXMQ_SLOTS - 1);
-
- list_add_tail(&r->next, &rw.wheel[rslot]);
- }
- }
-
- rw.prv = slot;
-
- pthread_mutex_unlock(&rw.lock);
-
- return 0;
-}
-
-static int rxmwheel_add(struct frcti * frcti,
- uint32_t seqno,
- struct shm_du_buff * sdb)
-{
- struct timespec now;
- struct rxm * r;
- size_t slot;
-
- r = malloc(sizeof(*r));
- if (r == NULL)
- return -ENOMEM;
-
- clock_gettime(PTHREAD_COND_CLOCK, &now);
-
- pthread_mutex_lock(&rw.lock);
-
- r->t0 = ts_to_us(now);
- r->mul = 0;
- r->seqno = seqno;
- r->sdb = sdb;
- r->head = shm_du_buff_head(sdb);
- r->tail = shm_du_buff_tail(sdb);
- r->frcti = frcti;
-
- slot = ((r->t0 + rto(frcti)) >> RXMQ_R) & (RXMQ_SLOTS - 1);
-
- list_add_tail(&r->next, &rw.wheel[slot]);
-
- pthread_mutex_unlock(&rw.lock);
-
- shm_du_buff_wait_ack(sdb);
-
- return 0;
-}
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