netdev - [PATCH net-next 7/9] net-timestamp: open gate for bpf

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Message-Id: <20241008095109.99918-8-kerneljasonxing@gmail.com>
Date: Tue,  8 Oct 2024 17:51:07 +0800
From: Jason Xing <kerneljasonxing@...il.com>
To: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	dsahern@...nel.org,
	willemdebruijn.kernel@...il.com,
	willemb@...gle.com,
	ast@...nel.org,
	daniel@...earbox.net,
	andrii@...nel.org,
	martin.lau@...ux.dev,
	eddyz87@...il.com,
	song@...nel.org,
	yonghong.song@...ux.dev,
	john.fastabend@...il.com,
	kpsingh@...nel.org,
	sdf@...ichev.me,
	haoluo@...gle.com,
	jolsa@...nel.org
Cc: bpf@...r.kernel.org,
	netdev@...r.kernel.org,
	Jason Xing <kernelxing@...cent.com>
Subject: [PATCH net-next 7/9] net-timestamp: open gate for bpf_setsockopt

From: Jason Xing <kernelxing@...cent.com>

Now we allow users to set tsflags through bpf_setsockopt. What I
want to do is passing SOF_TIMESTAMPING_RX_SOFTWARE flag, so that
we can generate rx timestamps the moment the skb traverses through
driver.

Here is an example:

case BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB:
case BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB:
	sock_opt = SOF_TIMESTAMPING_RX_SOFTWARE;
	bpf_setsockopt(skops, SOL_SOCKET, SO_TIMESTAMPING,
		       &sock_opt, sizeof(sock_opt));
	break;

In this way, we can use bpf program that help us generate and report
rx timestamp.

Signed-off-by: Jason Xing <kernelxing@...cent.com>
---
 net/core/filter.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/core/filter.c b/net/core/filter.c
index bd0d08bf76bb..9ce99d320571 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -5225,6 +5225,9 @@ static int sol_socket_sockopt(struct sock *sk, int optname,
 		break;
 	case SO_BINDTODEVICE:
 		break;
+	case SO_TIMESTAMPING_NEW:
+	case SO_TIMESTAMPING_OLD:
+		break;
 	default:
 		return -EINVAL;
 	}
-- 
2.37.3