From nobody Fri Dec 19 21:47:23 2025 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B3A7212FF8F for ; Thu, 7 Mar 2024 17:14:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709831678; cv=none; b=Q7A0eDQ1wH8JFkVUUwWHucHN53HVDymDawooGNwsLYb0FZ8WXTP0kYVppg87tAGjxEfKMgDjY6HGVVyAzpEQSpMPGZmRCflYCbFhFFykpd9GsiTOJFvULeNQw2UtYQ1kOWb0++GbFDPKkiP0ZOwsvBxmTh00+gw6r7ifJrF0/R0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709831678; c=relaxed/simple; bh=RHYXIvGJo8q/LIBWiLq20XUcVqSjEGZKfomR2XrwR+c=; h=Date:From:To:Cc:Subject:Message-ID:MIME-Version:Content-Type: Content-Disposition; b=WdqC+SDOFr/jIjU+aV3gGNpk+88+gYFiJD2XZIuskR/hNp5yRf2LsaJCeaxnZx8uxI2iLamoQeo6kxnRBXhrs1xDgHItVlV4ahUX4w9Dy03t++p9E4KYhVkDL8aqDBJhzEe5HsaMltYN1Ly4JiArQJCOF2zNtD7I8EN170ZbfYY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=KegBqN45; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="KegBqN45" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1709831675; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type; bh=NG816kiSDpgCjmlRtzxBd0pgqG2tGupf4H8p5jd/PSY=; b=KegBqN45l4TOQEe1++2C2xr2w84vUtRlWATMPB5S8zr1joPdpSw+SyNWjTrYaVIgsVUQqs JARm3b3orn42+KLIMZBYkRklvTBci1DKuP56i+y4cCnsdiuiHn+2NOn0Ydj+kaAw5X2P+h 82k3Zep1HCXJs2yCF+LYSPgFQUNk9Eg= Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-668-AO8X13KGOb2-QP-mwOuRKA-1; Thu, 07 Mar 2024 12:14:30 -0500 X-MC-Unique: AO8X13KGOb2-QP-mwOuRKA-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 0BDBF3C0BE2D; Thu, 7 Mar 2024 17:14:30 +0000 (UTC) Received: from tpad.localdomain (unknown [10.96.133.5]) by smtp.corp.redhat.com (Postfix) with ESMTPS id C931F17AA6; Thu, 7 Mar 2024 17:14:29 +0000 (UTC) Received: by tpad.localdomain (Postfix, from userid 1000) id 8CEA840AD6D54; Thu, 7 Mar 2024 14:14:03 -0300 (-03) Date: Thu, 7 Mar 2024 14:14:03 -0300 From: Marcelo Tosatti To: netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Willem de Bruijn , Jakub Kicinski , Eric Dumazet , Frederic Weisbecker , Valentin Schneider , Paolo Abeni Subject: [PATCH net-next -v5] net/core/dev.c: enable timestamp static key if CPU isolation is configured Message-ID: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.5 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" For systems that use CPU isolation (via nohz_full), creating or destroying a socket with SO_TIMESTAMP, SO_TIMESTAMPNS or SO_TIMESTAMPING with flag SOF_TIMESTAMPING_RX_SOFTWARE will cause a static key to be enabled/disabled. This in turn causes undesired IPIs to isolated CPUs. So enable the static key unconditionally, if CPU isolation is enabled, thus avoiding the IPIs. Signed-off-by: Marcelo Tosatti Reviewed-by: Willem de Bruijn --- v2: mention SOF_TIMESTAMPING_OPT_TX_SWHW in the commit log (Willem de Bruij= n / Paolo Abeni) v3: SOF_TIMESTAMPING_OPT_TX_SWHW is irrelevant (Willem de Bruijn) v4: additional changelog improvements (Willem de Bruijn) v5: late initcall not necessary, can use subsys initcall (Willem de Bruijn) diff --git a/net/core/dev.c b/net/core/dev.c index 0d548431f3fa..7832793b2980 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -153,6 +153,7 @@ #include #include #include +#include =20 #include "dev.h" #include "net-sysfs.h" @@ -11596,6 +11597,10 @@ static int __init net_dev_init(void) NULL, dev_cpu_dead); WARN_ON(rc < 0); rc =3D 0; + + /* avoid static key IPIs to isolated CPUs */ + if (housekeeping_enabled(HK_TYPE_MISC)) + net_enable_timestamp(); out: return rc; }