The previous patches handled the delivery_time before sch_handle_ingress(). This patch can now set the skb->mono_delivery_time to flag the skb->tstamp is used as the mono delivery_time (EDT) instead of the (rcv) timestamp and also clear it with skb_clear_delivery_time() after sch_handle_ingress(). This will make the bpf_redirect_*() to keep the mono delivery_time and used by a qdisc (fq) of the egress-ing interface. A latter patch will postpone the skb_clear_delivery_time() until the stack learns that the skb is being delivered locally and that will make other kernel forwarding paths (ip[6]_forward) able to keep the delivery_time also. Thus, like the previous patches on using the skb->mono_delivery_time bit, calling skb_clear_delivery_time() is not limited within the CONFIG_NET_INGRESS to avoid too many code churns among this set.
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| @@ -3993,8 +3993,7 @@ static inline void skb_set_delivery_time(struct sk_buff *skb, ktime_t kt, · 3992 unmodified lines | ||
| 3993 | 3993 | bool mono) |
| 3994 | 3994 | { |
| 3995 | 3995 | skb->tstamp = kt; |
| 3996 | − /* Setting mono_delivery_time will be enabled later */ | |
| 3997 | − skb->mono_delivery_time = 0; | |
| 3996 | + skb->mono_delivery_time = kt && mono; | |
| 3998 | 3997 | } |
| 3999 | 3998 | |
| 4000 | 3999 | DECLARE_STATIC_KEY_FALSE(netstamp_needed_key); |