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net-timestamp: Prepare for isolating two modes of SO_TIMESTAMPING

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No functional changes here. Only add test to see if the orig_skb
matches the usage of application SO_TIMESTAMPING.

In this series, bpf timestamping and previous socket timestamping
are implemented in the same function __skb_tstamp_tx(). To test
the socket enables socket timestamping feature, this function
skb_tstamp_tx_report_so_timestamping() is added.

In the next patch, another check for bpf timestamping feature
will be introduced just like the above report function, namely,
skb_tstamp_tx_report_bpf_timestamping(). Then users will be able
to know the socket enables either or both of features.

Signed-off-by: Jason Xing <kerneljasonxing@gmail.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20250220072940.99994-6-kerneljasonxing@gmail.com
This commit is contained in:
Jason Xing
2025-02-20 15:29:33 +08:00
committed by Martin KaFai Lau
parent 2958624b25
commit aa290f93a4
1 changed files with 20 additions and 0 deletions
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net/core/skbuff.c
+20
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@@ -5539,6 +5539,23 @@ err:
}
EXPORT_SYMBOL_GPL(skb_complete_tx_timestamp);
static bool skb_tstamp_tx_report_so_timestamping(struct sk_buff *skb,
struct skb_shared_hwtstamps *hwtstamps,
int tstype)
{
switch (tstype) {
case SCM_TSTAMP_SCHED:
return skb_shinfo(skb)->tx_flags & SKBTX_SCHED_TSTAMP;
case SCM_TSTAMP_SND:
return skb_shinfo(skb)->tx_flags & (hwtstamps ? SKBTX_HW_TSTAMP :
SKBTX_SW_TSTAMP);
case SCM_TSTAMP_ACK:
return TCP_SKB_CB(skb)->txstamp_ack;
}
return false;
}
void __skb_tstamp_tx(struct sk_buff *orig_skb,
const struct sk_buff *ack_skb,
struct skb_shared_hwtstamps *hwtstamps,
@@ -5551,6 +5568,9 @@ void __skb_tstamp_tx(struct sk_buff *orig_skb,
if (!sk)
return;
if (!skb_tstamp_tx_report_so_timestamping(orig_skb, hwtstamps, tstype))
return;
tsflags = READ_ONCE(sk->sk_tsflags);
if (!hwtstamps && !(tsflags & SOF_TIMESTAMPING_OPT_TX_SWHW) &&
skb_shinfo(orig_skb)->tx_flags & SKBTX_IN_PROGRESS)