net: export device speed and duplex via sysfs

This patch exports the link-speed (in Mbps) and duplex of an interface
via sysfs.  This eliminates the need to use ethtool just to check the
link-speed.  Not requiring 'ethtool' and not relying on the SIOCETHTOOL
ioctl should be helpful in an embedded environment where space is at a
premium as well.

NOTE: This patch also intentionally allows non-root users to check the link
speed and duplex -- something not possible with ethtool.

Here's some sample output:

# cat /sys/class/net/eth0/speed
100
# cat /sys/class/net/eth0/duplex
half
# ethtool eth0
Settings for eth0:
        Supported ports: [ TP ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Half 1000baseT/Full
        Supports auto-negotiation: Yes
        Advertised link modes:  Not reported
        Advertised auto-negotiation: No
        Speed: 100Mb/s
        Duplex: Half
        Port: Twisted Pair
        PHYAD: 1
        Transceiver: internal
        Auto-negotiation: off
        Supports Wake-on: g
        Wake-on: g
        Current message level: 0x000000ff (255)
        Link detected: yes

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 40 insertions, 0 deletions

diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index 821d30918cfc..effb78410eb2 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -130,6 +130,44 @@ static ssize_t show_carrier(struct device *dev,
         return -EINVAL;
 }
 
+static ssize_t show_speed(struct device *dev,
+                          struct device_attribute *attr, char *buf)
+{
+        struct net_device *netdev = to_net_dev(dev);
+        int ret = -EINVAL;
+
+        if (!rtnl_trylock())
+                return restart_syscall();
+
+        if (netif_running(netdev) && netdev->ethtool_ops->get_settings) {
+                struct ethtool_cmd cmd = { ETHTOOL_GSET };
+
+                if (!netdev->ethtool_ops->get_settings(netdev, &cmd))
+                        ret = sprintf(buf, fmt_dec, ethtool_cmd_speed(&cmd));
+        }
+        rtnl_unlock();
+        return ret;
+}
+
+static ssize_t show_duplex(struct device *dev,
+                           struct device_attribute *attr, char *buf)
+{
+        struct net_device *netdev = to_net_dev(dev);
+        int ret = -EINVAL;
+
+        if (!rtnl_trylock())
+                return restart_syscall();
+
+        if (netif_running(netdev) && netdev->ethtool_ops->get_settings) {
+                struct ethtool_cmd cmd = { ETHTOOL_GSET };
+
+                if (!netdev->ethtool_ops->get_settings(netdev, &cmd))
+                        ret = sprintf(buf, "%s\n", cmd.duplex ? "full" : "half");
+        }
+        rtnl_unlock();
+        return ret;
+}
+
 static ssize_t show_dormant(struct device *dev,
                             struct device_attribute *attr, char *buf)
 {
@@ -259,6 +297,8 @@ static struct device_attribute net_class_attributes[] = {
         __ATTR(address, S_IRUGO, show_address, NULL),
         __ATTR(broadcast, S_IRUGO, show_broadcast, NULL),
         __ATTR(carrier, S_IRUGO, show_carrier, NULL),
+        __ATTR(speed, S_IRUGO, show_speed, NULL),
+        __ATTR(duplex, S_IRUGO, show_duplex, NULL),
         __ATTR(dormant, S_IRUGO, show_dormant, NULL),
         __ATTR(operstate, S_IRUGO, show_operstate, NULL),
         __ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu),