linux-kernel - [PATCH net-next] net: bcmgenet: Allow changing carrier from user-space

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Date:   Thu,  2 Jul 2020 21:57:00 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     netdev@...r.kernel.org
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Doug Berger <opendmb@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        bcm-kernel-feedback-list@...adcom.com (open list:BROADCOM GENET
        ETHERNET DRIVER), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH net-next] net: bcmgenet: Allow changing carrier from user-space

The GENET driver interfaces with internal MoCA interface as well as
external MoCA chips like the BCM6802/6803 through a fixed link
interface. It is desirable for the mocad user-space daemon to be able to
control the carrier state based upon out of band messages that it
receives from the MoCA chip.

Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
 drivers/net/ethernet/broadcom/genet/bcmgenet.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
index af924a8b885f..ee84a26bd8f3 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
@@ -3647,6 +3647,22 @@ static struct net_device_stats *bcmgenet_get_stats(struct net_device *dev)
 	return &dev->stats;
 }
 
+static int bcmgenet_change_carrier(struct net_device *dev, bool new_carrier)
+{
+	struct bcmgenet_priv *priv = netdev_priv(dev);
+
+	if (!dev->phydev || !phy_is_pseudo_fixed_link(dev->phydev) ||
+	    priv->phy_interface != PHY_INTERFACE_MODE_MOCA)
+		return -EOPNOTSUPP;
+
+	if (new_carrier)
+		netif_carrier_on(dev);
+	else
+		netif_carrier_off(dev);
+
+	return 0;
+}
+
 static const struct net_device_ops bcmgenet_netdev_ops = {
 	.ndo_open		= bcmgenet_open,
 	.ndo_stop		= bcmgenet_close,
@@ -3660,6 +3676,7 @@ static const struct net_device_ops bcmgenet_netdev_ops = {
 	.ndo_poll_controller	= bcmgenet_poll_controller,
 #endif
 	.ndo_get_stats		= bcmgenet_get_stats,
+	.ndo_change_carrier	= bcmgenet_change_carrier,
 };
 
 /* Array of GENET hardware parameters/characteristics */
-- 
2.17.1