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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT 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 40F77C2D0C0 for ; Mon, 23 Dec 2019 10:46:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 15A5D2053B for ; Mon, 23 Dec 2019 10:46:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726828AbfLWKq2 (ORCPT ); Mon, 23 Dec 2019 05:46:28 -0500 Received: from szxga07-in.huawei.com ([45.249.212.35]:39904 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725799AbfLWKq1 (ORCPT ); Mon, 23 Dec 2019 05:46:27 -0500 Received: from DGGEMS411-HUB.china.huawei.com (unknown [172.30.72.59]) by Forcepoint Email with ESMTP id 218214BBEA90FFFFFDB1; Mon, 23 Dec 2019 18:46:25 +0800 (CST) Received: from localhost.localdomain.localdomain (10.175.113.25) by DGGEMS411-HUB.china.huawei.com (10.3.19.211) with Microsoft SMTP Server id 14.3.439.0; Mon, 23 Dec 2019 18:46:16 +0800 From: Mao Wenan To: , , , , , , , CC: , , , Subject: [PATCH net-next v2] af_packet: refactoring code for prb_calc_retire_blk_tmo Date: Mon, 23 Dec 2019 18:42:57 +0800 Message-ID: <20191223104257.132354-1-maowenan@huawei.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII X-Originating-IP: [10.175.113.25] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org If __ethtool_get_link_ksettings() is failed and with non-zero value, prb_calc_retire_blk_tmo() should return DEFAULT_PRB_RETIRE_TOV firstly. This patch is to refactory code and make it more readable. Signed-off-by: Mao Wenan --- v2: delete 'Fixes' tag, do not initialize some variable, and delete two variable as Willem de Bruijn proposal. net/packet/af_packet.c | 30 ++++++++++++------------------ 1 file changed, 12 insertions(+), 18 deletions(-) diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index 118cd66b7516..3bec515ccde3 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -520,7 +520,7 @@ static int prb_calc_retire_blk_tmo(struct packet_sock *po, int blk_size_in_bytes) { struct net_device *dev; - unsigned int mbits = 0, msec = 0, div = 0, tmo = 0; + unsigned int mbits, div; struct ethtool_link_ksettings ecmd; int err; @@ -532,31 +532,25 @@ static int prb_calc_retire_blk_tmo(struct packet_sock *po, } err = __ethtool_get_link_ksettings(dev, &ecmd); rtnl_unlock(); - if (!err) { - /* - * If the link speed is so slow you don't really - * need to worry about perf anyways - */ - if (ecmd.base.speed < SPEED_1000 || - ecmd.base.speed == SPEED_UNKNOWN) { - return DEFAULT_PRB_RETIRE_TOV; - } else { - msec = 1; - div = ecmd.base.speed / 1000; - } - } else + if (err) return DEFAULT_PRB_RETIRE_TOV; + /* If the link speed is so slow you don't really + * need to worry about perf anyways + */ + if (ecmd.base.speed < SPEED_1000 || + ecmd.base.speed == SPEED_UNKNOWN) + return DEFAULT_PRB_RETIRE_TOV; + + div = ecmd.base.speed / 1000; mbits = (blk_size_in_bytes * 8) / (1024 * 1024); if (div) mbits /= div; - tmo = mbits * msec; - if (div) - return tmo+1; - return tmo; + return mbits + 1; + return mbits; } static void prb_init_ft_ops(struct tpacket_kbdq_core *p1, -- 2.20.1