From: Jason Xing <kernelxing@xxxxxxxxxxx>
When the last sent skb in each sendmsg() is acknowledged in TCP layer,
we can print timestamp by setting BPF_SOCK_OPS_TS_ACK_OPT_CB in
bpf program.
Signed-off-by: Jason Xing <kernelxing@xxxxxxxxxxx>
---
include/uapi/linux/bpf.h | 5 +++++
net/core/skbuff.c | 3 +++
tools/include/uapi/linux/bpf.h | 5 +++++
3 files changed, 13 insertions(+)
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index b0032e173e65..6fc3bd12b650 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -7023,6 +7023,11 @@ enum {
* feature is on. It indicates the
* recorded timestamp.
*/
+ BPF_SOCK_OPS_TS_ACK_OPT_CB, /* Called when all the skbs are
+ * acknowledged 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 e29ab3e45213..8b2a79c0fe1c 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -5657,6 +5657,9 @@ static void skb_tstamp_tx_output_bpf(struct sock *sk, int tstype,
case SCM_TSTAMP_SND:
cb_flag = BPF_SOCK_OPS_TS_SW_OPT_CB;
break;
+ case SCM_TSTAMP_ACK:
+ cb_flag = BPF_SOCK_OPS_TS_ACK_OPT_CB;
+ break;
default:
return;
}
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index b0032e173e65..6fc3bd12b650 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -7023,6 +7023,11 @@ enum {
* feature is on. It indicates the
* recorded timestamp.
*/
+ BPF_SOCK_OPS_TS_ACK_OPT_CB, /* Called when all the skbs are
+ * acknowledged 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
