On Tue, Feb 4, 2025 at 9:03 AM Martin KaFai Lau <martin.lau@xxxxxxxxx> wrote:
>
> On 1/28/25 12:46 AM, Jason Xing wrote:
> > Make partial of the feature work finally. After this, user can
>
> If it is "partial"-ly done, what is still missing?
>
> My understanding is after this patch, the BPF program can fully support the TX
> timestamping in TCP.
I'm going to make the change in the next version. My thought was a big
project supporting various protocols.
>
> > fully use the bpf prog to trace the tx path for TCP type.
> >
> > Signed-off-by: Jason Xing <kerneljasonxing@xxxxxxxxx>
> > ---
> > net/ipv4/tcp.c | 9 +++++++++
> > 1 file changed, 9 insertions(+)
> >
> > diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
> > index 0d704bda6c41..0a41006b10d1 100644
> > --- a/net/ipv4/tcp.c
> > +++ b/net/ipv4/tcp.c
> > @@ -492,6 +492,15 @@ static void tcp_tx_timestamp(struct sock *sk, struct sockcm_cookie *sockc)
> > if (tsflags & SOF_TIMESTAMPING_TX_RECORD_MASK)
> > shinfo->tskey = TCP_SKB_CB(skb)->seq + skb->len - 1;
> > }
> > +
> > + if (SK_BPF_CB_FLAG_TEST(sk, SK_BPF_CB_TX_TIMESTAMPING) && skb) {
> > + struct skb_shared_info *shinfo = skb_shinfo(skb);
> > + struct tcp_skb_cb *tcb = TCP_SKB_CB(skb);
> > +
> > + tcb->txstamp_ack_bpf = 1;
> > + shinfo->tx_flags |= SKBTX_BPF;
> > + shinfo->tskey = TCP_SKB_CB(skb)->seq + skb->len - 1;
> > + }
> > }
> >
> > static bool tcp_stream_is_readable(struct sock *sk, int target)
>
