netdev - [PATCH 1/3] bpf: Add BPF_SOCK_OPS_TSTAMP_COMPLETION

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Message-ID: <256cac73a03d6c46b81766db0a1c67cd3220b8f5.1743337403.git.pav@iki.fi>
Date: Sun, 30 Mar 2025 15:23:36 +0300
From: Pauli Virtanen <pav@....fi>
To: linux-bluetooth@...r.kernel.org
Cc: Pauli Virtanen <pav@....fi>,
	netdev@...r.kernel.org,
	bpf@...r.kernel.org,
	willemdebruijn.kernel@...il.com,
	kerneljasonxing@...il.com
Subject: [PATCH 1/3] bpf: Add BPF_SOCK_OPS_TSTAMP_COMPLETION_CB callback

Support SCM_TSTAMP_COMPLETION case for bpf timestamping.

Add a new sock_ops callback, BPF_SOCK_OPS_TSTAMP_SND_SW_CB. This
callback shall occur at the same timestamping point as the user
space's software SCM_TSTAMP_COMPLETION. The BPF program can use it to
get the same SCM_TSTAMP_COMPLETION timestamp without modifying the
user-space application.

Emitting BPF completion timestamps is enabled in separate patches.

Signed-off-by: Pauli Virtanen <pav@....fi>
---
 include/uapi/linux/bpf.h | 5 +++++
 net/core/skbuff.c        | 3 +++
 2 files changed, 8 insertions(+)

diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index defa5bb881f4..6cd918febcb3 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -7054,6 +7054,11 @@ enum {
 					 * sendmsg timestamp with corresponding
 					 * tskey.
 					 */
+	BPF_SOCK_OPS_TSTAMP_COMPLETION_CB,	/* Called on skb completion
+						 * report from hardware when
+						 * SK_BPF_CB_TX_TIMESTAMPING
+						 * feature is on.
+						 */
 };
 
 /* 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 6cbf77bc61fc..9b2ff115eaf5 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -5552,6 +5552,9 @@ static void skb_tstamp_tx_report_bpf_timestamping(struct sk_buff *skb,
 	case SCM_TSTAMP_ACK:
 		op = BPF_SOCK_OPS_TSTAMP_ACK_CB;
 		break;
+	case SCM_TSTAMP_COMPLETION:
+		op = BPF_SOCK_OPS_TSTAMP_COMPLETION_CB;
+		break;
 	default:
 		return;
 	}
-- 
2.49.0