Issue: Udev events not generated by Ethernet driver

[B_K_Ankur]

Hello Friends,

I am using i.mx28evk with kernel 3.10.32 mainline on the board. I am facing issue of udev not receiving the events from Ethernet driver. I tried to monitor the udev events using command :

root@imx28evk:~# udevadm monitor

custom logging function 0x17b9c registered

runtime dir '/var/run/udev'

calling: monitor

monitor will print the received events for:

UDEV - the event which udev sends out after rule processing

KERNEL - the kernel uevent

[ 5772.113167] libphy: 800f0000.etherne:00 - Link is Down

[ 5774.193557] libphy: 800f0000.etherne:00 - Link is Up - 100/Full

//NO UDEV Events noticed disconnecting/connecting Ethernet 0

When I do plug/unplug the USB mass storgage I got lots of messages with udev events including action = add/remove. But with ethernet plugging/unplugging, I am not getting any messages.

I have also tried to find in the driver source under linux/driver/net/ethernet/freescale but couldnt able to find any api used to send uevent via kobject. Any comments on how to enable the udev events for Ethernet driver?

Regards,

Ankur

[alejandrolozan1]

Hi,

Can you share the udev rule? Have you tried this with the image of the FSL web page? (LTIB)

Best Regards,

Alejandro

[B_K_Ankur]

Hello Alejandro,

Sorry, I was away and couldn't able to work on this issue.

Udev Rules used:

root@imx28evk:~# cat /etc/udev/rules.d/autonet.rules

# Handle network interface setup

SUBSYSTEM=="net", ACTION=="add" RUN+="/etc/udev/scripts/network.sh"

SUBSYSTEM=="net", ACTION=="remove" RUN+="/etc/udev/scripts/network.sh"

I am using opensource program in c to listen to all netlink activites from Kernel.

Checking Netlink Activities from Kernel: netlink.c (http://pastebin.com/CA8NThAS)

I have tested with the latest kernel 2.6.35 and didnt found Ethernet plug/unplug event working. Find the below logs:

root@imx28evk:~# uname -r

2.6.35.3-1.1.0+yocto+g914558e

root@imx28evk:~# ./netlink

PHY: 0:00 - Link is Down

PHY: 0:00 - Link is Up - 100/Full

Same Program Works for USB Plug/Unplug events:

root@imx28evk:~# ./netlink

usb 2-1: new high speed USB device using fsl-ehci and address 2

add@/devices/platform/fsl-ehci.0/usb2/2-1

ACTION=add

DEVPATH=/devices/platform/fsl-ehcscsi0 : usb-storage 2-1:1.0

i.0/usb2/2-1

SUBSYSTEM=usb

MAJOR=189

MINOR=129

DEVNAME=bus/usb/002/002

DEVTYPE=usb_device

PRODUCT=5dc/a817/1100

TYPE=0/0/0

BUSNUM=002

DEVNUM=002

SEQNUM=1830

add@/devices/platform/fsl-ehci.0/usb2/2-1/2-1:1.0

ACTION=add

DEVPATH=/devices/platform/fsl-ehci.0/usb2/2-1/2-1:1.0

....

Could anyone throw some light on why Ethernet driver fails to send the plug/unplug event to udev via netlink sockets?

Please feel free to share if you need more information.

Regards,

Ankur

[B_K_Ankur · Accepted solution]

Hello All,

Added Patch into kernel to send the udev events to userspace.Please find the attached one.

Regards,

Ankur

---

net/core/Makefile | 1 +

net/core/uevent.c | 43 +++++++++++++++++++++++++++++++++++++++++++

2 files changed, 44 insertions(+)

create mode 100644 net/core/uevent.c

diff --git a/net/core/Makefile b/net/core/Makefile

index b33b996..a2139a7 100644

--- a/net/core/Makefile

+++ b/net/core/Makefile

@@ -22,3 +22,4 @@ obj-$(CONFIG_TRACEPOINTS) += net-traces.o

obj-$(CONFIG_NET_DROP_MONITOR) += drop_monitor.o

obj-$(CONFIG_NETWORK_PHY_TIMESTAMPING) += timestamping.o

obj-$(CONFIG_NETPRIO_CGROUP) += netprio_cgroup.o

+obj-$(CONFIG_HOTPLUG) += uevent.o

diff --git a/net/core/uevent.c b/net/core/uevent.c

new file mode 100644

index 0000000..14b1e6e

--- /dev/null

+++ b/net/core/uevent.c

@@ -0,0 +1,43 @@

+/*

+ * Linux network device event notification

+ */

+

+#include <linux/kernel.h>

+#include <linux/netdevice.h>

+#include <linux/kobject.h>

+#include <linux/notifier.h>

+

+/*

+ * Generate uevent in response to network device state changes.

+ * Other events are already handled by device subsystem.

+ */

+static int netdev_event(struct notifier_block *this, unsigned long event,

+ void *ptr)

+{

+ struct net_device *netdev = ptr;

+

+ switch (event) {

+ case NETDEV_UP:

+ kobject_uevent(&netdev->dev.kobj, KOBJ_ADD);

+ break;

+ case NETDEV_DOWN:

+ kobject_uevent(&netdev->dev.kobj, KOBJ_REMOVE);

+ break;

+ case NETDEV_CHANGE:{

+ kobject_uevent(&netdev->dev.kobj, KOBJ_CHANGE);

+ break;

+ }

+ }

+ return NOTIFY_DONE;

+}

+

+static struct notifier_block netdev_uevent_notifier = {

+ .notifier_call = netdev_event,

+};

+

+static int __init netdev_uevent_init(void)

+{

+ return register_netdevice_notifier(&netdev_uevent_notifier);

+}

+

+device_initcall(netdev_uevent_init);

--

[alejandrolozan1]

Hi,

Sorry for the delay, it seems that you already solved the problem. Thanks a lot for sharing the solution!!

Best Regards,

Alejandro