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.
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)
