On Sat, Jan 25, 2025 at 8:41 AM Martin KaFai Lau <martin.lau@xxxxxxxxx> wrote:
>
> On 1/20/25 5:28 PM, Jason Xing wrote:
> > Support SCM_TSTAMP_SND case. Then we will get the software
> > timestamp when the driver is about to send the skb. Later, I
> > will support the hardware timestamp.
> >
> > Signed-off-by: Jason Xing <kerneljasonxing@xxxxxxxxx>
> > ---
> > include/linux/skbuff.h | 2 +-
> > include/uapi/linux/bpf.h | 5 +++++
> > net/core/skbuff.c | 10 ++++++++--
> > tools/include/uapi/linux/bpf.h | 5 +++++
> > 4 files changed, 19 insertions(+), 3 deletions(-)
> >
> > diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
> > index 35c2e864dd4b..de8d3bd311f5 100644
> > --- a/include/linux/skbuff.h
> > +++ b/include/linux/skbuff.h
> > @@ -4569,7 +4569,7 @@ void skb_tstamp_tx(struct sk_buff *orig_skb,
> > static inline void skb_tx_timestamp(struct sk_buff *skb)
> > {
> > skb_clone_tx_timestamp(skb);
> > - if (skb_shinfo(skb)->tx_flags & SKBTX_SW_TSTAMP)
> > + if (skb_shinfo(skb)->tx_flags & (SKBTX_SW_TSTAMP | SKBTX_BPF))
> > __skb_tstamp_tx(skb, NULL, NULL, skb->sk, true, SCM_TSTAMP_SND);
> > }
> >
> > diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
> > index 72f93c6e45c1..a6d761f07f67 100644
> > --- a/include/uapi/linux/bpf.h
> > +++ b/include/uapi/linux/bpf.h
> > @@ -7027,6 +7027,11 @@ enum {
> > * feature is on. It indicates the
> > * recorded timestamp.
> > */
> > + BPF_SOCK_OPS_TS_SW_OPT_CB, /* Called when skb is about to send
> > + * to the nic when SO_TIMESTAMPING
>
> Same comment on the "SO_TIMESTAMPING".
Got it. Thanks.
Thanks,
Jason
