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From:   Oleksij Rempel <o.rempel@pengutronix.de>
To:     Andrew Lunn <andrew@lunn.ch>,
        "David S. Miller" <davem@davemloft.net>,
        Florian Fainelli <f.fainelli@gmail.com>,
        Heiner Kallweit <hkallweit1@gmail.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Jonathan Corbet <corbet@lwn.net>,
        Michal Kubecek <mkubecek@suse.cz>,
        "John W. Linville" <linville@tuxdriver.com>
Cc:     Oleksij Rempel <o.rempel@pengutronix.de>,
        David Jander <david@protonic.nl>, kernel@pengutronix.de,
        linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
        Russell King <linux@armlinux.org.uk>, mkl@pengutronix.de,
        Marek Vasut <marex@denx.de>,
        Christian Herber <christian.herber@nxp.com>,
        Amit Cohen <amitc@mellanox.com>,
        Petr Machata <petrm@mellanox.com>
Subject: [PATCH ethtool v1] netlink: add LINKSTATE SQI support
Date:   Tue, 26 May 2020 10:29:42 +0200
Message-Id: <20200526082942.28073-1-o.rempel@pengutronix.de>
MIME-Version: 1.0
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Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Some PHYs provide Signal Quality Index (SQI) if the link is in active
state. This information can help to diagnose cable and system design
related issues.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 netlink/desc-ethtool.c       |  2 ++
 netlink/settings.c           | 16 ++++++++++++++++
 uapi/linux/ethtool_netlink.h |  2 ++
 3 files changed, 20 insertions(+)

diff --git a/netlink/desc-ethtool.c b/netlink/desc-ethtool.c
index 76c6f13..f4559ea 100644
--- a/netlink/desc-ethtool.c
+++ b/netlink/desc-ethtool.c
@@ -91,6 +91,8 @@ static const struct pretty_nla_desc __linkstate_desc[] = {
 	NLATTR_DESC_INVALID(ETHTOOL_A_LINKSTATE_UNSPEC),
 	NLATTR_DESC_NESTED(ETHTOOL_A_LINKSTATE_HEADER, header),
 	NLATTR_DESC_BOOL(ETHTOOL_A_LINKSTATE_LINK),
+	NLATTR_DESC_U32(ETHTOOL_A_LINKSTATE_SQI),
+	NLATTR_DESC_U32(ETHTOOL_A_LINKSTATE_SQI_MAX),
 };
 
 static const struct pretty_nla_desc __debug_desc[] = {
diff --git a/netlink/settings.c b/netlink/settings.c
index 8be5a22..a6b2fba 100644
--- a/netlink/settings.c
+++ b/netlink/settings.c
@@ -604,6 +604,22 @@ int linkstate_reply_cb(const struct nlmsghdr *nlhdr, void *data)
 		printf("\tLink detected: %s\n", val ? "yes" : "no");
 	}
 
+	if (tb[ETHTOOL_A_LINKSTATE_SQI]) {
+		uint32_t val = mnl_attr_get_u32(tb[ETHTOOL_A_LINKSTATE_SQI]);
+
+		print_banner(nlctx);
+		printf("\tSQI: %u", val);
+
+		if (tb[ETHTOOL_A_LINKSTATE_SQI_MAX]) {
+			uint32_t max;
+
+			max = mnl_attr_get_u32(tb[ETHTOOL_A_LINKSTATE_SQI_MAX]);
+			printf("/%u\n", max);
+		} else {
+			printf("\n");
+		}
+	}
+
 	return MNL_CB_OK;
 }
 
diff --git a/uapi/linux/ethtool_netlink.h b/uapi/linux/ethtool_netlink.h
index ad6d3a0..98e236c 100644
--- a/uapi/linux/ethtool_netlink.h
+++ b/uapi/linux/ethtool_netlink.h
@@ -197,6 +197,8 @@ enum {
 	ETHTOOL_A_LINKSTATE_UNSPEC,
 	ETHTOOL_A_LINKSTATE_HEADER,		/* nest - _A_HEADER_* */
 	ETHTOOL_A_LINKSTATE_LINK,		/* u8 */
+	ETHTOOL_A_LINKSTATE_SQI,		/* u32 */
+	ETHTOOL_A_LINKSTATE_SQI_MAX,		/* u32 */
 
 	/* add new constants above here */
 	__ETHTOOL_A_LINKSTATE_CNT,
-- 
2.26.2