From patchwork Mon Oct 14 12:56:37 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yonglong Liu X-Patchwork-Id: 1176347 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=huawei.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 46sJZ750Vdz9sPh for ; Tue, 15 Oct 2019 00:00:15 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731954AbfJNNAM (ORCPT ); Mon, 14 Oct 2019 09:00:12 -0400 Received: from szxga07-in.huawei.com ([45.249.212.35]:53618 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1730126AbfJNNAL (ORCPT ); Mon, 14 Oct 2019 09:00:11 -0400 Received: from DGGEMS408-HUB.china.huawei.com (unknown [172.30.72.58]) by Forcepoint Email with ESMTP id 40342F1A9E89E082ED4E; Mon, 14 Oct 2019 21:00:08 +0800 (CST) Received: from localhost.localdomain (10.67.165.24) by DGGEMS408-HUB.china.huawei.com (10.3.19.208) with Microsoft SMTP Server id 14.3.439.0; Mon, 14 Oct 2019 21:00:02 +0800 From: Yonglong Liu To: , , CC: , , , , , Subject: [RFC PATCH V2 net] net: phy: Fix "link partner" information disappear issue Date: Mon, 14 Oct 2019 20:56:37 +0800 Message-ID: <1571057797-37602-1-git-send-email-liuyonglong@huawei.com> X-Mailer: git-send-email 2.8.1 MIME-Version: 1.0 X-Originating-IP: [10.67.165.24] X-CFilter-Loop: Reflected Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Some drivers just call phy_ethtool_ksettings_set() to set the links, for those phy drivers that use genphy_read_status(), if autoneg is on, and the link is up, than execute "ethtool -s ethx autoneg on" will cause "link partner" information disappear. The call trace is phy_ethtool_ksettings_set()->phy_start_aneg() ->linkmode_zero(phydev->lp_advertising)->genphy_read_status(), the link didn't change, so genphy_read_status() just return, and phydev->lp_advertising is zero now. This patch moves the clear operation of lp_advertising from phy_start_aneg() to genphy_read_lpa()/genphy_c45_read_lpa(), and if autoneg on and autoneg not complete, just clear what the generic functions care about. Fixes: 88d6272acaaa ("net: phy: avoid unneeded MDIO reads in genphy_read_status") Signed-off-by: Yonglong Liu --- change log: V2: moves the clear operation of lp_advertising from phy_start_aneg() to genphy_read_lpa()/genphy_c45_read_lpa(), and if autoneg on and autoneg not complete, just clear what the generic functions care about. Suggested by Heiner Kallweit. --- --- drivers/net/phy/phy-c45.c | 2 ++ drivers/net/phy/phy.c | 3 --- drivers/net/phy/phy_device.c | 12 +++++++++++- 3 files changed, 13 insertions(+), 4 deletions(-) diff --git a/drivers/net/phy/phy-c45.c b/drivers/net/phy/phy-c45.c index 7935593..a1caeee 100644 --- a/drivers/net/phy/phy-c45.c +++ b/drivers/net/phy/phy-c45.c @@ -323,6 +323,8 @@ int genphy_c45_read_pma(struct phy_device *phydev) { int val; + linkmode_zero(phydev->lp_advertising); + val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1); if (val < 0) return val; diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c index 119e6f4..105d389b 100644 --- a/drivers/net/phy/phy.c +++ b/drivers/net/phy/phy.c @@ -572,9 +572,6 @@ int phy_start_aneg(struct phy_device *phydev) if (AUTONEG_DISABLE == phydev->autoneg) phy_sanitize_settings(phydev); - /* Invalidate LP advertising flags */ - linkmode_zero(phydev->lp_advertising); - err = phy_config_aneg(phydev); if (err < 0) goto out_unlock; diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c index 9d2bbb1..4b43466 100644 --- a/drivers/net/phy/phy_device.c +++ b/drivers/net/phy/phy_device.c @@ -1787,7 +1787,14 @@ int genphy_read_lpa(struct phy_device *phydev) { int lpa, lpagb; - if (phydev->autoneg == AUTONEG_ENABLE && phydev->autoneg_complete) { + if (phydev->autoneg == AUTONEG_ENABLE) { + if (!phydev->autoneg_complete) { + mii_stat1000_mod_linkmode_lpa_t(phydev->lp_advertising, + 0); + mii_lpa_mod_linkmode_lpa_t(phydev->lp_advertising, 0); + return 0; + } + if (phydev->is_gigabit_capable) { lpagb = phy_read(phydev, MII_STAT1000); if (lpagb < 0) @@ -1816,6 +1823,9 @@ int genphy_read_lpa(struct phy_device *phydev) mii_lpa_mod_linkmode_lpa_t(phydev->lp_advertising, lpa); } + else { + linkmode_zero(phydev->lp_advertising); + } return 0; }