bond: add support to read speed and duplex via ethtool

This patch adds support for the get_settings ethtool op to the bonding
driver.  This was motivated by users who wanted to get the speed of the
bond and compare that against throughput to understand utilization.
The behavior before this patch was added was problematic when computing
line utilization after trying to get link-speed and throughput via SNMP.

Output from ethtool looks like this for a round-robin bond:

Settings for bond0:
	Supported ports: [ ]
	Supported link modes:   Not reported
	Supported pause frame use: No
	Supports auto-negotiation: No
	Advertised link modes:  Not reported
	Advertised pause frame use: No
	Advertised auto-negotiation: No
	Speed: 11000Mb/s
	Duplex: Full
	Port: Other
	PHYAD: 0
	Transceiver: internal
	Auto-negotiation: off
	MDI-X: Unknown
	Link detected: yes

I tested this and verified it works as expected.  A test was also done
on a version backported to an older kernel and it worked well there.

v2: Switch to using ethtool_cmd_speed_set to set speed, added check to
SLAVE_IS_OK for each slave in bond, dropped mode-specific calculations
as they were not needed, and set port type to 'Other.'

v3: Fix useless assignment and checkpatch warning.

Signed-off-by: Andy Gospodarek <andy@greyhouse.net>
Reviewed-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/bonding/bond_main.c

@@ -4226,6 +4226,37 @@ void bond_set_mode_ops(struct bonding *bond, int mode)
 	}
 }
 
+static int bond_ethtool_get_settings(struct net_device *bond_dev,
+				     struct ethtool_cmd *ecmd)
+{
+	struct bonding *bond = netdev_priv(bond_dev);
+	struct slave *slave;
+	int i;
+	unsigned long speed = 0;
+
+	ecmd->duplex = DUPLEX_UNKNOWN;
+	ecmd->port = PORT_OTHER;
+
+	/* Since SLAVE_IS_OK returns false for all inactive or down slaves, we
+	 * do not need to check mode.  Though link speed might not represent
+	 * the true receive or transmit bandwidth (not all modes are symmetric)
+	 * this is an accurate maximum.
+	 */
+	read_lock(&bond->lock);
+	bond_for_each_slave(bond, slave, i) {
+		if (SLAVE_IS_OK(slave)) {
+			if (slave->speed != SPEED_UNKNOWN)
+				speed += slave->speed;
+			if (ecmd->duplex == DUPLEX_UNKNOWN &&
+			    slave->duplex != DUPLEX_UNKNOWN)
+				ecmd->duplex = slave->duplex;
+		}
+	}
+	ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
+	read_unlock(&bond->lock);
+	return 0;
+}
+
 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
 				     struct ethtool_drvinfo *drvinfo)
 {
@@ -4237,6 +4268,7 @@ static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
 
 static const struct ethtool_ops bond_ethtool_ops = {
 	.get_drvinfo		= bond_ethtool_get_drvinfo,
+	.get_settings		= bond_ethtool_get_settings,
 	.get_link		= ethtool_op_get_link,
 };