Re: [PATCH bpf-next v7 06/13] net-timestamp: support SCM_TSTAMP_SCHED for bpf extension

[Jason Xing <kerneljasonxing@xxxxxxxxx>]

On Tue, Feb 4, 2025 at 7:23 AM Martin KaFai Lau <martin.lau@xxxxxxxxx> wrote:
>
> On 1/28/25 12:46 AM, Jason Xing wrote:
> > diff --git a/net/core/skbuff.c b/net/core/skbuff.c
> > index 6042961dfc02..d19d577b996f 100644
> > --- a/net/core/skbuff.c
> > +++ b/net/core/skbuff.c
> > @@ -5564,6 +5564,24 @@ static bool skb_enable_app_tstamp(struct sk_buff *skb, int tstype, bool sw)
> >       return false;
> >   }
> >
> > +static void skb_tstamp_tx_bpf(struct sk_buff *skb, struct sock *sk, int tstype)
> > +{
> > +     int op;
> > +
> > +     if (!sk)
>
> This check is redundant.

Thanks. Will remove it.

>
> > +             return;
> > +
> > +     switch (tstype) {
> > +     case SCM_TSTAMP_SCHED:
> > +             op = BPF_SOCK_OPS_TS_SCHED_OPT_CB;
> > +             break;
> > +     default:
> > +             return;
> > +     }
> > +
> > +     bpf_skops_tx_timestamping(sk, skb, op);
> > +}
> > +
> >   void __skb_tstamp_tx(struct sk_buff *orig_skb,
> >                    const struct sk_buff *ack_skb,
> >                    struct skb_shared_hwtstamps *hwtstamps,
> > @@ -5576,6 +5594,11 @@ void __skb_tstamp_tx(struct sk_buff *orig_skb,
> >       if (!sk)
>
> It has been tested here...
>
> >               return;
> >
> > +     /* bpf extension feature entry */
> > +     if (skb_shinfo(orig_skb)->tx_flags & SKBTX_BPF)
> > +             skb_tstamp_tx_bpf(orig_skb, sk, tstype);
>
> ...before calling this.
>
> > +
> > +     /* application feature entry */
> >       if (!skb_enable_app_tstamp(orig_skb, tstype, sw))
> >               return;