netdev - [PATCH 2/3] usbnet: add method for reporting speed without MDIO

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Date:   Thu,  7 Jan 2021 12:35:17 +0100
From:   Oliver Neukum <oneukum@...e.com>
To:     netdev@...r.kernel.org, davem@...emloft.net, roland@...nel.org
Cc:     Oliver Neukum <oneukum@...e.com>
Subject: [PATCH 2/3] usbnet: add method for reporting speed without MDIO

The old method for reporting network speed upwards
assumed that a device uses MDIO and uses the generic phy
functions based on that.
Add a a primitive internal version not making the assumption
reporting back directly what the status operations record.

Signed-off-by: Oliver Neukum <oneukum@...e.com>
Tested-by: Roland Dreier <roland@...nel.org>
---
 drivers/net/usb/usbnet.c   | 23 +++++++++++++++++++++++
 include/linux/usb/usbnet.h |  4 ++++
 2 files changed, 27 insertions(+)

diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index e2ca88259b05..fe702ef32007 100644
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -961,6 +961,27 @@ int usbnet_get_link_ksettings_mdio(struct net_device *net,
 }
 EXPORT_SYMBOL_GPL(usbnet_get_link_ksettings_mdio);
 
+int usbnet_get_link_ksettings_internal(struct net_device *net,
+					struct ethtool_link_ksettings *cmd)
+{
+	struct usbnet *dev = netdev_priv(net);
+
+	/* the assumption that speed is equal on tx and rx
+	 * is deeply engrained into the networking layer.
+	 * For wireless stuff it is not true.
+	 * We assume that rxspeed matters more.
+	 */
+	if (dev->rxspeed != -1)
+		cmd->base.speed = dev->rxspeed / 1000000;
+	else if (dev->txspeed != -1)
+		cmd->base.speed = dev->txspeed / 1000000;
+	else
+		cmd->base.speed = SPEED_UNKNOWN;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(usbnet_get_link_ksettings_internal);
+
 int usbnet_set_link_ksettings_mdio(struct net_device *net,
 			      const struct ethtool_link_ksettings *cmd)
 {
@@ -1664,6 +1685,8 @@ usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
 	dev->intf = udev;
 	dev->driver_info = info;
 	dev->driver_name = name;
+	dev->rxspeed = -1; /* unknown or handled by MII */
+	dev->txspeed = -1;
 
 	net->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
 	if (!net->tstats)
diff --git a/include/linux/usb/usbnet.h b/include/linux/usb/usbnet.h
index 407469ee224f..6a3677c0f113 100644
--- a/include/linux/usb/usbnet.h
+++ b/include/linux/usb/usbnet.h
@@ -53,6 +53,8 @@ struct usbnet {
 	u32			hard_mtu;	/* count any extra framing */
 	size_t			rx_urb_size;	/* size for rx urbs */
 	struct mii_if_info	mii;
+	long			rxspeed;	/* if MII is not used */
+	long			txspeed;	/* if MII is not used */
 
 	/* various kinds of pending driver work */
 	struct sk_buff_head	rxq;
@@ -267,6 +269,8 @@ extern void usbnet_purge_paused_rxq(struct usbnet *);
 
 extern int usbnet_get_link_ksettings_mdio(struct net_device *net,
 				     struct ethtool_link_ksettings *cmd);
+extern int usbnet_get_link_ksettings_internal(struct net_device *net,
+					struct ethtool_link_ksettings *cmd);
 extern int usbnet_set_link_ksettings_mdio(struct net_device *net,
 				     const struct ethtool_link_ksettings *cmd);
 extern u32 usbnet_get_link(struct net_device *net);
-- 
2.26.2