From patchwork Thu Dec 5 07:10:57 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yang Yingliang X-Patchwork-Id: 296733 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 99A972C00A4 for ; Thu, 5 Dec 2013 18:13:15 +1100 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752118Ab3LEHNM (ORCPT ); Thu, 5 Dec 2013 02:13:12 -0500 Received: from szxga01-in.huawei.com ([119.145.14.64]:25200 "EHLO szxga01-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751124Ab3LEHNK (ORCPT ); Thu, 5 Dec 2013 02:13:10 -0500 Received: from 172.24.2.119 (EHLO szxeml209-edg.china.huawei.com) ([172.24.2.119]) by szxrg01-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id BNV49722; Thu, 05 Dec 2013 15:13:01 +0800 (CST) Received: from SZXEML449-HUB.china.huawei.com (10.82.67.192) by szxeml209-edg.china.huawei.com (172.24.2.184) with Microsoft SMTP Server (TLS) id 14.3.158.1; Thu, 5 Dec 2013 15:11:04 +0800 Received: from localhost (10.135.68.218) by szxeml449-hub.china.huawei.com (10.82.67.192) with Microsoft SMTP Server id 14.3.158.1; Thu, 5 Dec 2013 15:11:01 +0800 From: Yang Yingliang To: , CC: , , , Subject: [PATCH net v5 2/2] net: sched: htb: fix calculation of quantum Date: Thu, 5 Dec 2013 15:10:57 +0800 Message-ID: <1386227457-86900-3-git-send-email-yangyingliang@huawei.com> X-Mailer: git-send-email 1.8.1.msysgit.1 In-Reply-To: <1386227457-86900-1-git-send-email-yangyingliang@huawei.com> References: <1386227457-86900-1-git-send-email-yangyingliang@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.135.68.218] X-CFilter-Loop: Reflected Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Now, 32bit rates may be not the true rate. So use rate_bytes_ps which is from max(rate32, rate64) to calcualte quantum. Signed-off-by: Yang Yingliang Acked-by: Eric Dumazet --- net/sched/sch_htb.c | 18 ++++++++++-------- 1 file changed, 10 insertions(+), 8 deletions(-) diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c index 0e1e38b..57c6678 100644 --- a/net/sched/sch_htb.c +++ b/net/sched/sch_htb.c @@ -1477,11 +1477,20 @@ static int htb_change_class(struct Qdisc *sch, u32 classid, sch_tree_lock(sch); } + rate64 = tb[TCA_HTB_RATE64] ? nla_get_u64(tb[TCA_HTB_RATE64]) : 0; + + ceil64 = tb[TCA_HTB_CEIL64] ? nla_get_u64(tb[TCA_HTB_CEIL64]) : 0; + + psched_ratecfg_precompute(&cl->rate, &hopt->rate, rate64); + psched_ratecfg_precompute(&cl->ceil, &hopt->ceil, ceil64); + /* it used to be a nasty bug here, we have to check that node * is really leaf before changing cl->un.leaf ! */ if (!cl->level) { - cl->quantum = hopt->rate.rate / q->rate2quantum; + u64 quantum = div64_u64(cl->rate.rate_bytes_ps, + q->rate2quantum); + cl->quantum = min_t(u64, quantum, INT_MAX); if (!hopt->quantum && cl->quantum < 1000) { pr_warning( "HTB: quantum of class %X is small. Consider r2q change.\n", @@ -1500,13 +1509,6 @@ static int htb_change_class(struct Qdisc *sch, u32 classid, cl->prio = TC_HTB_NUMPRIO - 1; } - rate64 = tb[TCA_HTB_RATE64] ? nla_get_u64(tb[TCA_HTB_RATE64]) : 0; - - ceil64 = tb[TCA_HTB_CEIL64] ? nla_get_u64(tb[TCA_HTB_CEIL64]) : 0; - - psched_ratecfg_precompute(&cl->rate, &hopt->rate, rate64); - psched_ratecfg_precompute(&cl->ceil, &hopt->ceil, ceil64); - cl->buffer = PSCHED_TICKS2NS(hopt->buffer); cl->cbuffer = PSCHED_TICKS2NS(hopt->cbuffer);