Messages in this thread Patch in this message | | | Date | Mon, 27 Sep 2004 00:51:09 +0200 (CEST) | From | Jesper Juhl <> | Subject | [PATCH] add sysfs attribute 'carrier' for net devices |
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Hi,
Here's a patch that adds a new sysfs attribute for net devices. The new attribute 'carrier' exposes the result of netif_carrier_ok() so that when a network device has carrier the attribute value is 1 and when there is no carrier the attribute value is 0. Very rellevant attribute for network devices in my oppinion, and sysfs is the logical place for it.
I've tested this only on my own machine, but I get the expected results:
With network cable plugged into eth0 :
juhl@dragon:~$ cat /sys/class/net/eth0/carrier 1 juhl@dragon:~$
With network cable unplugged :
juhl@dragon:~$ cat /sys/class/net/eth0/carrier 0 juhl@dragon:~$
Please review and consider applying.
Signed-off-by: Jesper Juhl <juhl-lkml@dif.dk>
diff -u linux-2.6.9-rc2-bk5-orig/net/core/net-sysfs.c linux-2.6.9-rc2-bk5/net/core/net-sysfs.c --- linux-2.6.9-rc2-bk5-orig/net/core/net-sysfs.c 2004-09-14 23:19:53.000000000 +0200 +++ linux-2.6.9-rc2-bk5/net/core/net-sysfs.c 2004-09-27 00:24:01.000000000 +0200 @@ -126,8 +126,21 @@ return -EINVAL; } +static ssize_t show_carrier(struct class_device *dev, char *buf) +{ + struct net_device *net = to_net_dev(dev); + if (netif_running(net)) { + if (netif_carrier_ok(net)) + return snprintf(buf, 3, "%d\n", 1); + else + return snprintf(buf, 3, "%d\n", 0); + } + return -EINVAL; +} + static CLASS_DEVICE_ATTR(address, S_IRUGO, show_address, NULL); static CLASS_DEVICE_ATTR(broadcast, S_IRUGO, show_broadcast, NULL); +static CLASS_DEVICE_ATTR(carrier, S_IRUGO, show_carrier, NULL); /* read-write attributes */ NETDEVICE_SHOW(mtu, fmt_dec); @@ -186,6 +199,7 @@ &class_device_attr_type, &class_device_attr_address, &class_device_attr_broadcast, + &class_device_attr_carrier, NULL }; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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