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traffic-pacing-edt: Use SKB->mark to identify different stages

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This can be used by bpftrace programs to identify different
stages, when trying to determine the EDT accuracy.

Signed-off-by: Jesper D. Brouer <netoptimizer@brouer.com>
This commit is contained in:
Jesper D. Brouer
2020-12-01 10:07:25 +01:00
parent b84b89dc4b
commit 79466715cf
1 changed files with 6 additions and 1 deletions
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7
traffic-pacing-edt/edt_pacer02.c
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@@ -135,6 +135,7 @@ static __always_inline int sched_departure(struct __sk_buff *skb, __u32 key)
WRITE_ONCE(edt->t_last, t_curr_next);
skb->tstamp = t_curr_next;
skb->mark = 1; /* No queue - add minimum delay */
#else
WRITE_ONCE(edt->t_last, t_curr);
#endif
@@ -156,10 +157,14 @@ static __always_inline int sched_departure(struct __sk_buff *skb, __u32 key)
// if (codel_drop(edt, t_queue_sz, now))
if (codel_drop(&edt->codel, t_queue_sz, t_next))
return BPF_DROP;
skb->mark = 2; /* (time) queue exist - and small/below T_HORIZON_ECN */
/* ECN marking horizon */
if (t_queue_sz >= T_HORIZON_ECN)
if (t_queue_sz >= T_HORIZON_ECN) {
skb->mark = 3; /* (time) queue exist - and is large */
bpf_skb_ecn_set_ce(skb);
}
/* Advance "time queue" */
WRITE_ONCE(edt->t_last, t_next);