From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 81FE9C433F5 for ; Thu, 6 Sep 2018 04:06:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3DCBA2075B for ; Thu, 6 Sep 2018 04:06:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3DCBA2075B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727844AbeIFIjW (ORCPT ); Thu, 6 Sep 2018 04:39:22 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:36696 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725938AbeIFIjW (ORCPT ); Thu, 6 Sep 2018 04:39:22 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 4C635804BCF4; Thu, 6 Sep 2018 04:05:57 +0000 (UTC) Received: from jason-ThinkPad-T450s.redhat.com (ovpn-12-125.pek2.redhat.com [10.72.12.125]) by smtp.corp.redhat.com (Postfix) with ESMTP id 643E310DCF6D; Thu, 6 Sep 2018 04:05:51 +0000 (UTC) From: Jason Wang To: netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, mst@redhat.com, jasowang@redhat.com Subject: [PATCH net-next 05/11] tuntap: tweak on the path of non-xdp case in tun_build_skb() Date: Thu, 6 Sep 2018 12:05:20 +0800 Message-Id: <20180906040526.22518-6-jasowang@redhat.com> In-Reply-To: <20180906040526.22518-1-jasowang@redhat.com> References: <20180906040526.22518-1-jasowang@redhat.com> X-Scanned-By: MIMEDefang 2.78 on 10.11.54.3 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.8]); Thu, 06 Sep 2018 04:05:57 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.8]); Thu, 06 Sep 2018 04:05:57 +0000 (UTC) for IP:'10.11.54.3' DOMAIN:'int-mx03.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'jasowang@redhat.com' RCPT:'' Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org If we're sure not to go native XDP, there's no need for several things like bh and rcu stuffs. Signed-off-by: Jason Wang --- drivers/net/tun.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/net/tun.c b/drivers/net/tun.c index f8cdcfa392c3..389aa0727cc6 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -1675,10 +1675,12 @@ static struct sk_buff *tun_build_skb(struct tun_struct *tun, * of xdp_prog above, this should be rare and for simplicity * we do XDP on skb in case the headroom is not enough. */ - if (hdr->gso_type || !xdp_prog) + if (hdr->gso_type || !xdp_prog) { *skb_xdp = 1; - else - *skb_xdp = 0; + goto build; + } + + *skb_xdp = 0; local_bh_disable(); rcu_read_lock(); @@ -1724,6 +1726,7 @@ static struct sk_buff *tun_build_skb(struct tun_struct *tun, rcu_read_unlock(); local_bh_enable(); +build: skb = build_skb(buf, buflen); if (!skb) { skb = ERR_PTR(-ENOMEM); -- 2.17.1