netdev - [PATCH net-next 3/3] nfp: add support restart of link auto-negotiation

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Date:   Wed, 21 Sep 2022 14:12:35 +0200
From:   Simon Horman <simon.horman@...igine.com>
To:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     netdev@...r.kernel.org, oss-drivers@...igine.com,
        Fei Qin <fei.qin@...igine.com>
Subject: [PATCH net-next 3/3] nfp: add support restart of link auto-negotiation

From: Fei Qin <fei.qin@...igine.com>

Add support restart of link auto-negotiation.
This may be initiated using:

  # ethtool -r <intf>

Signed-off-by: Fei Qin <fei.qin@...igine.com>
Reviewed-by: Louis Peens <louis.peens@...igine.com>
Signed-off-by: Simon Horman <simon.horman@...igine.com>
---
 .../ethernet/netronome/nfp/nfp_net_ethtool.c  | 33 +++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c b/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c
index 00aacc48a7a2..ceda4d0b98bf 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c
@@ -228,6 +228,37 @@ nfp_net_get_drvinfo(struct net_device *netdev, struct ethtool_drvinfo *drvinfo)
 	nfp_get_drvinfo(nn->app, nn->pdev, vnic_version, drvinfo);
 }
 
+static int
+nfp_net_nway_reset(struct net_device *netdev)
+{
+	struct nfp_eth_table_port *eth_port;
+	struct nfp_port *port;
+	int err;
+
+	port = nfp_port_from_netdev(netdev);
+	eth_port = nfp_port_get_eth_port(port);
+	if (!eth_port)
+		return -EOPNOTSUPP;
+
+	if (!netif_running(netdev))
+		return 0;
+
+	err = nfp_port_configure(netdev, false);
+	if (err) {
+		netdev_info(netdev, "Link down failed: %d\n", err);
+		return err;
+	}
+
+	err = nfp_port_configure(netdev, true);
+	if (err) {
+		netdev_info(netdev, "Link up failed: %d\n", err);
+		return err;
+	}
+
+	netdev_info(netdev, "Link reset succeeded\n");
+	return 0;
+}
+
 static void
 nfp_app_get_drvinfo(struct net_device *netdev, struct ethtool_drvinfo *drvinfo)
 {
@@ -1854,6 +1885,7 @@ static const struct ethtool_ops nfp_net_ethtool_ops = {
 				     ETHTOOL_COALESCE_MAX_FRAMES |
 				     ETHTOOL_COALESCE_USE_ADAPTIVE,
 	.get_drvinfo		= nfp_net_get_drvinfo,
+	.nway_reset             = nfp_net_nway_reset,
 	.get_link		= ethtool_op_get_link,
 	.get_ringparam		= nfp_net_get_ringparam,
 	.set_ringparam		= nfp_net_set_ringparam,
@@ -1891,6 +1923,7 @@ static const struct ethtool_ops nfp_net_ethtool_ops = {
 
 const struct ethtool_ops nfp_port_ethtool_ops = {
 	.get_drvinfo		= nfp_app_get_drvinfo,
+	.nway_reset             = nfp_net_nway_reset,
 	.get_link		= ethtool_op_get_link,
 	.get_strings		= nfp_port_get_strings,
 	.get_ethtool_stats	= nfp_port_get_stats,
-- 
2.30.2