From: Jason Xing <kernelxing@xxxxxxxxxxx>
Introduce BPF_SOCK_OPS_TS_SCHED_OPT_CB flag so that we can decide to
print timestamps when the skb just passes the dev layer.
Signed-off-by: Jason Xing <kernelxing@xxxxxxxxxxx>
---
include/uapi/linux/bpf.h | 5 +++++
net/core/skbuff.c | 17 +++++++++++++++--
tools/include/uapi/linux/bpf.h | 5 +++++
3 files changed, 25 insertions(+), 2 deletions(-)
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 157e139ed6fc..3cf3c9c896c7 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -7019,6 +7019,11 @@ enum {
* by the kernel or the
* earlier bpf-progs.
*/
+ BPF_SOCK_OPS_TS_SCHED_OPT_CB, /* Called when skb is passing through
+ * dev layer when SO_TIMESTAMPING
+ * feature is on. It indicates the
+ * recorded timestamp.
+ */
};
/* List of TCP states. There is a build check in net/ipv4/tcp.c to detect
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 3a4110d0f983..16e7bdc1eacb 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -5632,8 +5632,21 @@ static void bpf_skb_tstamp_tx_output(struct sock *sk, int tstype)
return;
tp = tcp_sk(sk);
- if (BPF_SOCK_OPS_TEST_FLAG(tp, BPF_SOCK_OPS_TX_TIMESTAMPING_OPT_CB_FLAG))
- return;
+ if (BPF_SOCK_OPS_TEST_FLAG(tp, BPF_SOCK_OPS_TX_TIMESTAMPING_OPT_CB_FLAG)) {
+ struct timespec64 tstamp;
+ u32 cb_flag;
+
+ switch (tstype) {
+ case SCM_TSTAMP_SCHED:
+ cb_flag = BPF_SOCK_OPS_TS_SCHED_OPT_CB;
+ break;
+ default:
+ return;
+ }
+
+ tstamp = ktime_to_timespec64(ktime_get_real());
+ tcp_call_bpf_2arg(sk, cb_flag, tstamp.tv_sec, tstamp.tv_nsec);
+ }
}
void __skb_tstamp_tx(struct sk_buff *orig_skb,
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index 93853d9d4922..d60675e1a5a0 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -7018,6 +7018,11 @@ enum {
* by the kernel or the
* earlier bpf-progs.
*/
+ BPF_SOCK_OPS_TS_SCHED_OPT_CB, /* Called when skb is passing through
+ * dev layer when SO_TIMESTAMPING
+ * feature is on. It indicates the
+ * recorded timestamp.
+ */
};
/* List of TCP states. There is a build check in net/ipv4/tcp.c to detect
--
2.37.3
