netdev - [PATCH] net: phy: micrel: add Asym Pause workaround for KSZ9021

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20190926075437.18088-1-haan@cellavision.se>
Date:   Thu, 26 Sep 2019 09:54:37 +0200
From:   Hans Andersson <haan@...lavision.se>
To:     <andrew@...n.ch>
CC:     <f.fainelli@...il.com>, <hkallweit1@...il.com>,
        <davem@...emloft.net>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <antoine.tenart@...tlin.com>,
        Hans Andersson <hans.andersson@...lavision.se>
Subject: [PATCH] net: phy: micrel: add Asym Pause workaround for KSZ9021

From: Hans Andersson <hans.andersson@...lavision.se>

The Micrel KSZ9031 PHY may fail to establish a link when the Asymmetric
Pause capability is set. This issue is described in a Silicon Errata
(DS80000691D or DS80000692D), which advises to always disable the
capability.

Micrel KSZ9021 has no errata, but has the same issue with Asymmetric Pause.
This patch apply the same workaround as the one for KSZ9031.

Signed-off-by: Hans Andersson <hans.andersson@...lavision.se>
---
 drivers/net/phy/micrel.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
index 3c8186f..2fea554 100644
--- a/drivers/net/phy/micrel.c
+++ b/drivers/net/phy/micrel.c
@@ -763,6 +763,8 @@ static int ksz9031_get_features(struct phy_device *phydev)
 	 * Whenever the device's Asymmetric Pause capability is set to 1,
 	 * link-up may fail after a link-up to link-down transition.
 	 *
+	 * The Errata Sheet is for ksz9031, but ksz9021 has the same issue
+	 *
 	 * Workaround:
 	 * Do not enable the Asymmetric Pause capability bit.
 	 */
@@ -1076,6 +1078,7 @@ static struct phy_driver ksphy_driver[] = {
 	/* PHY_GBIT_FEATURES */
 	.driver_data	= &ksz9021_type,
 	.probe		= kszphy_probe,
+	.get_features	= ksz9031_get_features,
 	.config_init	= ksz9021_config_init,
 	.ack_interrupt	= kszphy_ack_interrupt,
 	.config_intr	= kszphy_config_intr,
-- 
2.17.1