/* Borrow from codel_should_drop in Linux kernel */
static bool codel_should_mark(const struct sk_buff *skb,
struct wfq_class *cl,
s64 now_ns)
{
bool ok_to_mark;
codel_time_t now = ns_to_codel_time(now_ns);
cl->ldelay = ns_to_codel_time(now_ns - skb->tstamp.tv64);
if (codel_time_before(cl->ldelay, (codel_time_t)wfq_codel_target) ||
cl->len_bytes <= wfq_max_pkt_bytes)
{
/* went below - stay below for at least interval */
cl->first_above_time = 0;
return false;
}
ok_to_mark = false;
if (cl->first_above_time == 0)
{
/* just went above from below. If we stay above
* for at least interval we'll say it's ok to mark
*/
cl->first_above_time = now + wfq_codel_interval;
}
else if (codel_time_after(now, cl->first_above_time))
{
ok_to_mark = true;
}
return ok_to_mark;
}
/* TCN marking scheme */
static inline void tcn_marking(struct sk_buff *skb)
{
codel_time_t delay;
delay = ns_to_codel_time(ktime_get_ns() - skb->tstamp.tv64);
if (codel_time_after(delay, (codel_time_t)wfq_tcn_thresh))
INET_ECN_set_ce(skb);
}
static int
codel_should_drop(struct codel *c, class_queue_t *q, struct mbuf *m,
u_int64_t now)
{
struct m_tag *mtag;
uint64_t *enqueue_time;
if (m == NULL) {
c->vars.first_above_time = 0;
return (0);
}
mtag = m_tag_locate(m, MTAG_CODEL, 0, NULL);
if (mtag == NULL) {
/* Only one warning per second. */
if (ppsratecheck(&c->last_log, &c->last_pps, 1))
printf("%s: could not found the packet mtag!\n",
__func__);
c->vars.first_above_time = 0;
return (0);
}
enqueue_time = (uint64_t *)(mtag + 1);
c->vars.ldelay = now - *enqueue_time;
c->stats.maxpacket = MAX(c->stats.maxpacket, m_pktlen(m));
if (codel_time_before(c->vars.ldelay, c->params.target) ||
qsize(q) <= c->stats.maxpacket) {
/* went below - stay below for at least interval */
c->vars.first_above_time = 0;
return (0);
}
if (c->vars.first_above_time == 0) {
/* just went above from below. If we stay above
* for at least interval we'll say it's ok to drop
*/
c->vars.first_above_time = now + c->params.interval;
return (0);
}
if (codel_time_after(now, c->vars.first_above_time))
return (1);
return (0);
}
