From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj2-f13.google.com (mail-pj2-f13.google.com [74.125.227.141]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 520BE360EF6 for ; Sat, 19 Sep 2026 14:39:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.227.141 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789828755; cv=none; b=A9YV3gyhwW55w//SqLHBZ8jeJyHHiyhDFCUfvIYtmczG/cVc9hahLwYVYOZee3DMzS7kgSOM1YauNimmATOLsAY7FBKpYef7riaNiHoNeZb347L/40TGRoOS8ohJHmsWp6mi/x+DAJ7Ao1eAUc5WzXi0LTEu8+4vdh8Xb0+NHO8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789828755; c=relaxed/simple; bh=Mhp9R0MCJnTDusbMi0FJ0eO35srlQlW9YSNrSMYga/U=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=utDqiP2c7Tp5dpOFR+P6lSC3mOMpxzERs0nZXigB8wEGVAJQOTQ7br5nD+iQM7mDZGIg84tv4+4l8eHD+tD2qx8R2U/nDNB+Zks3jON97jJnGkqzKVwbvzdoZSyphrI7emNR4wbn+AfxyktTMdhSLedOlGABF/S+61m0iqV+rSo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=TeCerQc5; arc=none smtp.client-ip=74.125.227.141 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="TeCerQc5" Received: by mail-pj2-f13.google.com with SMTP id d9443c01a7336-2d8fdc579daso18904705ad.1 for ; Sat, 19 Sep 2026 07:39:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1789828753; x=1790433553; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to:content-type; bh=9LRQZ57qeaendWDYofTy5iNhQaGS0Bdj4+bJU5zeKFs=; b=TeCerQc5TmVIsPH4E306TqildhkF7hx/cjv2m+dPqRE4FvBaofUVvTovVhviubO9uE 2rbMZEi7vouYQpGgUKHco5qdLl8axLjXfjKjDzOCYukEXK1tTwBfp/QJfHJo/7sQHYLv KR+IAO5Ur8qqo3X8IfNNl0UeN0XMeDhY+A4X3OIqN+MpXHEIngtRM7ZpBAmwL/n62Hc/ FAWoQTEFNkNhbKRgJIg+HcXYOg8gLC/ZOFVHY0DyR2jiI68OvO06SDNDsT5kvLNDBKKu h1ZOvxU+T0H3pd0piaBESAZTvn+Y77aOu6+wTB2CBfRhPgr93R8sbz77mbCVGNMzf9pX dY+A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1789828753; x=1790433553; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to:content-type; bh=9LRQZ57qeaendWDYofTy5iNhQaGS0Bdj4+bJU5zeKFs=; b=IxwIbDTc5gW+LPAaTAojToP2MgK0DrwQvuL37eiIrHwuaRo8C126KV4nMXiYM7SGB7 4P1J1BPMbc53zxeY1kvNt+L5SxJrFelI+v7ievwIfxHxo0c3ENKG2K6hZ3jTTSyqxz3X mYPDauTWJ0pUbAks53PA7giQkOQtnt7tMVDloklpY1VyVoENDxgGBD6VmpqvvhI6yLee jFhTQCoruN1+lqZlWzWJGEyb4dVBeJ59V/3vqJ1HQ4Cm7GtR6eAXBLOYhDEV5I0Skczv dUFsJe0DeD5J5EuqiRbPR5Cd1WQ1ILznWpd/1cA2WVwpyGa9m/uOX8BeoD5xzeqB2+Y2 TcGw== X-Gm-Message-State: AFuF++ln8X+zW+IJMnT68BYHhBfoBDUreX5eSVRZ3Ohp6Yv/Bqg9ED2F JQRLVjEp8jXXD3XX2OQrwBAmv2H0zCh1HZtDfYdNjIooHDJqewL52FaV X-Gm-Gg: AYBFou25oRD/iQbSUF1OI7Q5ipJJtuOvEfSUu75aD7zzDBR2yXcs29tRCfSb1UiG9tu FV+Nvv4pCvrqTiP3HKX7oi0xoTFd2O6qoyrspZyS3ZPmhOMQv4DwO1xgiqqE8rJSlkDEFxflbR6 xqm4++e+1Eomw7w0AXV/vTbTqSWfeV9lrdX/lPRZ4fjdDSxWru3NNbgomzu7IjnOpUz1WIYiN2a z5gEvrJ4O6YXXWYhuP/0zUhMRxu01cJAcE7SSLDbcuwqQ1YlJK04mkDUrs2lcfnIhw5AVpMp7aS Wwc7mTp7OcFLLRZxyOv4rKdyzJ7guXXuAMbfTRuEYjoDizG7UIpD0ezkzE/OZr+gzo3e9/cM8+O gMv0b96SExkOUUQj4EbOS+bxlM0yqYU96xbx9Gqu3LQjSgNpIoRl+jGPazlmghC/NWFtatWjwID QuHXJy/+1QDHKdlcm8JRxpErLZyEd3Ow1+i7++tWcyAAGSEqKz5sLdlphhUHS+1NGHXD/FvQQO6 50oGKsvz1GDLusJfM8cQYxgAXToswH63xVijPk74o7MLTvuhu/kdp9t93GTUmhgANHHXHJxgJIW QpW0ADvC8UtVbvDbqbsZG+ec6+KuylGCwM+2VZi+a7cBXVzpJHGXEHgcVz0= X-Received: by 2002:a17:903:1b45:b0:2dd:c100:3142 with SMTP id d9443c01a7336-2ddc1003253mr39175395ad.62.1789828752736; Sat, 19 Sep 2026 07:39:12 -0700 (PDT) Received: from KERNELXING-MC1.tencent.com ([43.132.141.21]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2ddc179ed79sm10711715ad.43.2026.09.19.07.39.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 19 Sep 2026 07:39:11 -0700 (PDT) From: Jason Xing To: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, willemb@google.com, kuniyu@google.com Cc: netdev@vger.kernel.org, bpf@vger.kernel.org, Jason Xing Subject: [PATCH RFC net-next 7/9] tcp: propagate the start time onto every skb in the tx path Date: Sat, 19 Sep 2026 22:37:30 +0800 Message-Id: <20260919143732.11772-8-kerneljasonxing@gmail.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20260919143732.11772-1-kerneljasonxing@gmail.com> References: <20260919143732.11772-1-kerneljasonxing@gmail.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Now that sendmsg() records a start time in sk->sk_start_time within the socket lock protection, copy that value into the shared hwtstamps of each skb. The timing is tcp_skb_entail() runs once per newly allocated skb in the sendmsg() loop, every segment produced by a single sendmsg() carries the same start time. Signed-off-by: Jason Xing --- net/ipv4/tcp.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 28730a3e4473..85e3bae3569d 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -702,6 +702,9 @@ void tcp_skb_entail(struct sock *sk, struct sk_buff *skb) tcb->tcp_flags = TCPHDR_ACK; __skb_header_release(skb); psp_enqueue_set_decrypted(sk, skb); + if (static_branch_unlikely(&bpfts_v2_needed_key) && + SK_BPF_CB_FLAG_TEST(sk, SK_BPF_CB_TIMESTAMPING_V2)) + skb_hwtstamps(skb)->start_time = sk->sk_start_time; tcp_add_write_queue_tail(sk, skb); sk_wmem_queued_add(sk, skb->truesize); sk_mem_charge(sk, skb->truesize); -- 2.43.7