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net: Set skb->mono_delivery_time and clear it after sch_handle_ingress()

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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.

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Martin KaFai Lau
2022-03-02 11:55:50 -08:00
committed by David S. Miller
parent d93376f503
commit d98d58a002
3 changed files with 8 additions and 6 deletions
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3
include/linux/skbuff.h
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@@ -3993,8 +3993,7 @@ static inline void skb_set_delivery_time(struct sk_buff *skb, ktime_t kt,
bool mono)
{
skb->tstamp = kt;
/* Setting mono_delivery_time will be enabled later */
skb->mono_delivery_time = 0;
skb->mono_delivery_time = kt && mono;
}
DECLARE_STATIC_KEY_FALSE(netstamp_needed_key);