From: Martin KaFai Lau <kafai@fb.com>
Date: Wed, 2 Mar 2022 11:55:31 -0800
Subject: net: Add skb_clear_tstamp() to keep the mono delivery_time
Patch-mainline: v5.18-rc1
Git-commit: de799101519aad23c6096041ba2744d7b5517e6a
References: jsc#PED-1377
Right now, skb->tstamp is reset to 0 whenever the skb is forwarded.
If skb->tstamp has the mono delivery_time, clearing it can hurt
the performance when it finally transmits out to fq@phy-dev.
The earlier patch added a skb->mono_delivery_time bit to
flag the skb->tstamp carrying the mono delivery_time.
This patch adds skb_clear_tstamp() helper which keeps
the mono delivery_time and clears everything else.
The delivery_time clearing will be postponed until the stack knows the
skb will be delivered locally. It will be done in a latter patch.
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
---
drivers/net/loopback.c | 2 +-
include/linux/skbuff.h | 10 +++++++++-
net/bridge/br_forward.c | 2 +-
net/core/filter.c | 6 +++---
net/core/skbuff.c | 2 +-
net/ipv4/ip_forward.c | 2 +-
net/ipv6/ip6_output.c | 2 +-
net/netfilter/ipvs/ip_vs_xmit.c | 6 +++---
net/netfilter/nf_dup_netdev.c | 2 +-
net/netfilter/nf_flow_table_ip.c | 4 ++--
net/netfilter/nft_fwd_netdev.c | 2 +-
net/openvswitch/vport.c | 2 +-
net/xfrm/xfrm_interface.c | 2 +-
13 files changed, 26 insertions(+), 18 deletions(-)
--- a/drivers/net/loopback.c
+++ b/drivers/net/loopback.c
@@ -74,7 +74,7 @@ static netdev_tx_t loopback_xmit(struct
skb_tx_timestamp(skb);
/* do not fool net_timestamp_check() with various clock bases */
- skb->tstamp = 0;
+ skb_clear_tstamp(skb);
skb_orphan(skb);
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -3851,6 +3851,14 @@ static inline void skb_set_delivery_time
skb->mono_delivery_time = 0;
}
+static inline void skb_clear_tstamp(struct sk_buff *skb)
+{
+ if (skb->mono_delivery_time)
+ return;
+
+ skb->tstamp = 0;
+}
+
static inline u8 skb_metadata_len(const struct sk_buff *skb)
{
return skb_shinfo(skb)->meta_len;
@@ -4704,7 +4712,7 @@ static inline void skb_set_redirected(st
#ifdef CONFIG_NET_REDIRECT
skb->from_ingress = from_ingress;
if (skb->from_ingress)
- skb->tstamp = 0;
+ skb_clear_tstamp(skb);
#endif
}
--- a/net/bridge/br_forward.c
+++ b/net/bridge/br_forward.c
@@ -60,7 +60,7 @@ EXPORT_SYMBOL_GPL(br_dev_queue_push_xmit
int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
{
- skb->tstamp = 0;
+ skb_clear_tstamp(skb);
return NF_HOOK(NFPROTO_BRIDGE, NF_BR_POST_ROUTING,
net, sk, skb, NULL, skb->dev,
br_dev_queue_push_xmit);
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -2107,7 +2107,7 @@ static inline int __bpf_tx_skb(struct ne
}
skb->dev = dev;
- skb->tstamp = 0;
+ skb_clear_tstamp(skb);
dev_xmit_recursion_inc();
ret = dev_queue_xmit(skb);
@@ -2176,7 +2176,7 @@ static int bpf_out_neigh_v6(struct net *
}
skb->dev = dev;
- skb->tstamp = 0;
+ skb_clear_tstamp(skb);
if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) {
skb = skb_expand_head(skb, hh_len);
@@ -2274,7 +2274,7 @@ static int bpf_out_neigh_v4(struct net *
}
skb->dev = dev;
- skb->tstamp = 0;
+ skb_clear_tstamp(skb);
if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) {
skb = skb_expand_head(skb, hh_len);
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -5359,7 +5359,7 @@ void skb_scrub_packet(struct sk_buff *sk
ipvs_reset(skb);
skb->mark = 0;
- skb->tstamp = 0;
+ skb_clear_tstamp(skb);
}
EXPORT_SYMBOL_GPL(skb_scrub_packet);
--- a/net/ipv4/ip_forward.c
+++ b/net/ipv4/ip_forward.c
@@ -79,7 +79,7 @@ static int ip_forward_finish(struct net
if (unlikely(opt->optlen))
ip_forward_options(skb);
- skb->tstamp = 0;
+ skb_clear_tstamp(skb);
return dst_output(net, sk, skb);
}
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -464,7 +464,7 @@ static inline int ip6_forward_finish(str
}
#endif
- skb->tstamp = 0;
+ skb_clear_tstamp(skb);
return dst_output(net, sk, skb);
}
--- a/net/netfilter/ipvs/ip_vs_xmit.c
+++ b/net/netfilter/ipvs/ip_vs_xmit.c
@@ -610,7 +610,7 @@ static inline int ip_vs_tunnel_xmit_prep
nf_reset_ct(skb);
skb_forward_csum(skb);
if (skb->dev)
- skb->tstamp = 0;
+ skb_clear_tstamp(skb);
}
return ret;
}
@@ -652,7 +652,7 @@ static inline int ip_vs_nat_send_or_cont
if (!local) {
skb_forward_csum(skb);
if (skb->dev)
- skb->tstamp = 0;
+ skb_clear_tstamp(skb);
NF_HOOK(pf, NF_INET_LOCAL_OUT, cp->ipvs->net, NULL, skb,
NULL, skb_dst(skb)->dev, dst_output);
} else
@@ -674,7 +674,7 @@ static inline int ip_vs_send_or_cont(int
ip_vs_drop_early_demux_sk(skb);
skb_forward_csum(skb);
if (skb->dev)
- skb->tstamp = 0;
+ skb_clear_tstamp(skb);
NF_HOOK(pf, NF_INET_LOCAL_OUT, cp->ipvs->net, NULL, skb,
NULL, skb_dst(skb)->dev, dst_output);
} else
--- a/net/netfilter/nf_dup_netdev.c
+++ b/net/netfilter/nf_dup_netdev.c
@@ -19,7 +19,7 @@ static void nf_do_netdev_egress(struct s
skb_push(skb, skb->mac_len);
skb->dev = dev;
- skb->tstamp = 0;
+ skb_clear_tstamp(skb);
dev_queue_xmit(skb);
}
--- a/net/netfilter/nf_flow_table_ip.c
+++ b/net/netfilter/nf_flow_table_ip.c
@@ -376,7 +376,7 @@ nf_flow_offload_ip_hook(void *priv, stru
nf_flow_nat_ip(flow, skb, thoff, dir, iph);
ip_decrease_ttl(iph);
- skb->tstamp = 0;
+ skb_clear_tstamp(skb);
if (flow_table->flags & NF_FLOWTABLE_COUNTER)
nf_ct_acct_update(flow->ct, tuplehash->tuple.dir, skb->len);
@@ -611,7 +611,7 @@ nf_flow_offload_ipv6_hook(void *priv, st
nf_flow_nat_ipv6(flow, skb, dir, ip6h);
ip6h->hop_limit--;
- skb->tstamp = 0;
+ skb_clear_tstamp(skb);
if (flow_table->flags & NF_FLOWTABLE_COUNTER)
nf_ct_acct_update(flow->ct, tuplehash->tuple.dir, skb->len);
--- a/net/netfilter/nft_fwd_netdev.c
+++ b/net/netfilter/nft_fwd_netdev.c
@@ -143,7 +143,7 @@ static void nft_fwd_neigh_eval(const str
return;
skb->dev = dev;
- skb->tstamp = 0;
+ skb_clear_tstamp(skb);
neigh_xmit(neigh_table, dev, addr, skb);
out:
regs->verdict.code = verdict;
--- a/net/openvswitch/vport.c
+++ b/net/openvswitch/vport.c
@@ -507,7 +507,7 @@ void ovs_vport_send(struct vport *vport,
}
skb->dev = vport->dev;
- skb->tstamp = 0;
+ skb_clear_tstamp(skb);
vport->ops->send(skb);
return;
--- a/net/xfrm/xfrm_interface.c
+++ b/net/xfrm/xfrm_interface.c
@@ -190,7 +190,7 @@ static void xfrmi_dev_uninit(struct net_
static void xfrmi_scrub_packet(struct sk_buff *skb, bool xnet)
{
- skb->tstamp = 0;
+ skb_clear_tstamp(skb);
skb->pkt_type = PACKET_HOST;
skb->skb_iif = 0;
skb->ignore_df = 0;