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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
View file

@ -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);

8
net/core/dev.c
View file

@ -5220,8 +5220,10 @@ static int __netif_receive_skb_core(struct sk_buff **pskb, bool pfmemalloc,
goto out;
}
if (skb_skip_tc_classify(skb))
if (skb_skip_tc_classify(skb)) {
skb_clear_delivery_time(skb);
goto skip_classify;
}
if (pfmemalloc)
goto skip_taps;
@ -5250,12 +5252,14 @@ static int __netif_receive_skb_core(struct sk_buff **pskb, bool pfmemalloc,
goto another_round;
if (!skb)
goto out;
skb_clear_delivery_time(skb);
nf_skip_egress(skb, false);
if (nf_ingress(skb, &pt_prev, &ret, orig_dev) < 0)
goto out;
}
} else
#endif
skb_clear_delivery_time(skb);
skb_reset_redirect(skb);
skip_classify:
if (pfmemalloc && !skb_pfmemalloc_protocol(skb))

3
net/ipv4/ip_output.c
View file

@ -1728,8 +1728,7 @@ void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb,
arg->csumoffset) = csum_fold(csum_add(nskb->csum,
arg->csum));
nskb->ip_summed = CHECKSUM_NONE;
/* Setting mono_delivery_time will be enabled later */
nskb->mono_delivery_time = 0;
nskb->mono_delivery_time = !!transmit_time;
ip_push_pending_frames(sk, &fl4);
}
out: