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Message-Id: <20241008095109.99918-5-kerneljasonxing@gmail.com>
Date: Tue, 8 Oct 2024 17:51:04 +0800
From: Jason Xing <kerneljasonxing@...il.com>
To: davem@...emloft.net,
edumazet@...gle.com,
kuba@...nel.org,
pabeni@...hat.com,
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Cc: bpf@...r.kernel.org,
netdev@...r.kernel.org,
Jason Xing <kernelxing@...cent.com>
Subject: [PATCH net-next 4/9] net-timestamp: introduce TS_ACK_OPT_CB to generate tcp acked timestamp
From: Jason Xing <kernelxing@...cent.com>
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@...cent.com>
---
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 0d00539f247a..1b478ec18ac2 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -7029,6 +7029,11 @@ 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 8faaa96c026b..2b1b2f7d271a 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -5559,6 +5559,9 @@ static bool bpf_skb_tstamp_tx(struct sock *sk, u32 scm_flag,
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 true;
}
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index 020ec14ffae6..fc9b94de19f2 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -7028,6 +7028,11 @@ 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
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