From patchwork Fri Aug 18 11:31:37 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Salil Mehta X-Patchwork-Id: 9908373 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id F1FBF60382 for ; Fri, 18 Aug 2017 11:34:02 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E4E1228C85 for ; Fri, 18 Aug 2017 11:34:02 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D9D0C28C8A; Fri, 18 Aug 2017 11:34:02 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5BEAD28C85 for ; Fri, 18 Aug 2017 11:34:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751687AbdHRLdl (ORCPT ); Fri, 18 Aug 2017 07:33:41 -0400 Received: from szxga05-in.huawei.com ([45.249.212.191]:4071 "EHLO szxga05-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750881AbdHRLca (ORCPT ); Fri, 18 Aug 2017 07:32:30 -0400 Received: from 172.30.72.59 (EHLO DGGEMS414-HUB.china.huawei.com) ([172.30.72.59]) by dggrg05-dlp.huawei.com (MOS 4.4.6-GA FastPath queued) with ESMTP id DFM57981; Fri, 18 Aug 2017 19:32:27 +0800 (CST) Received: from S00293818-DELL1.china.huawei.com (10.203.181.151) by DGGEMS414-HUB.china.huawei.com (10.3.19.214) with Microsoft SMTP Server id 14.3.301.0; Fri, 18 Aug 2017 19:32:15 +0800 From: Salil Mehta To: CC: , , , , , , , , Subject: [PATCH net-next 1/3] net: hns3: Fixes the missing u64_stats_fetch_begin_irq in 64-bit stats fetch Date: Fri, 18 Aug 2017 12:31:37 +0100 Message-ID: <20170818113139.153200-2-salil.mehta@huawei.com> X-Mailer: git-send-email 2.8.3 In-Reply-To: <20170818113139.153200-1-salil.mehta@huawei.com> References: <20170818113139.153200-1-salil.mehta@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.203.181.151] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020202.5996D04B.00BD, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=0.0.0.0, so=2014-11-16 11:51:01, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: b994b4c4bf1af27004b0ad2713b79b17 Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch fixes the missing u64_stats_fetch_begin_irq() while trying to atomically do 64-bit RX/TX fetch. We did not get any error during test as our SoC is 64-bit so all of these seq/lock operations results in NOOP. As such, this seq lock supports has been added for the sake of completion if this code ever runs on 32-bit platform and we are trying to do 64-bit stats fetch. Fixes: 76ad4f0ee747 ("net: hns3: Add support of HNS3 Ethernet Driver for hip08 SoC") Reported-by: Dan Carpenter Signed-off-by: Salil Mehta --- drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.c index 9589b7e..b12730a 100644 --- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.c +++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.c @@ -1054,6 +1054,7 @@ hns3_nic_get_stats64(struct net_device *netdev, struct rtnl_link_stats64 *stats) /* fetch the tx stats */ ring = priv->ring_data[idx].ring; do { + start = u64_stats_fetch_begin_irq(&ring->syncp); tx_bytes += ring->stats.tx_bytes; tx_pkts += ring->stats.tx_pkts; } while (u64_stats_fetch_retry_irq(&ring->syncp, start)); @@ -1061,6 +1062,7 @@ hns3_nic_get_stats64(struct net_device *netdev, struct rtnl_link_stats64 *stats) /* fetch the rx stats */ ring = priv->ring_data[idx + queue_num].ring; do { + start = u64_stats_fetch_begin_irq(&ring->syncp); rx_bytes += ring->stats.rx_bytes; rx_pkts += ring->stats.rx_pkts; } while (u64_stats_fetch_retry_irq(&ring->syncp, start));