The code in the driver is based on the specs from ADMTek (later,
Infineon). Since i never suspend my machines this feature has not been
tested by me.
However, if the proposed patch is the right thing to do i'd be happy to
see it applied.
cheers,
Petko
On Fri, 18 Jan 2013, Ming Lei wrote:
On Fri, Jan 18, 2013 at 8:12 AM, Sarah Sharp
<sarah.a.sharp@xxxxxxxxxxxxxxx> wrote:
Is it reasonable to expect that Wake on LAN works if the target box is
connected via a USB-to-ethernet adapter?
It is surely reasonable, and seems SMSC75xx or SMSC95xx can
bring system out of suspend.
One of my validation testers has a USB ethernet device that successfully
wakes up Windows from hibernate (S4), but it doesn't work under Linux.
Wake on LAN works fine with the hardwired ethernet port. USB remote
wakeup from S3/S4 works fine with a USB keyboard.
So I need to figure out if it's an issue with the kernel, their test
suite, or the USB host controller.
I've experimented with USB ethernet devices with the pegasus driver with
no success. Here's what I've tried:
1. Connect the USB to ethernet adapter to the rootport under the xHCI
(USB 3.0) host controller. (lsusb for the two devices I've tried is
attached)
2. Enable remote wakeup for all devices (including the PCI host) by
echoing 'enabled' to power/wakeup. (script for that attached)
3. Use ethtool to turn on WOL:
sudo ethtool -s ethX wol g
Could you check here if the attribute 'power/wakeup' of the USB device
has been enabled? If so, and step 6 still can't wakeup system, the
problem may be in the set_wol stetting on hardware of the driver since
your USB wakeup works.
Also, the wakeup enabling is missed in the pegasus_set_wol(), and
the below patch is needed:
diff --git a/drivers/net/usb/pegasus.c b/drivers/net/usb/pegasus.c
index a0b5807..d5304f1 100644
--- a/drivers/net/usb/pegasus.c
+++ b/drivers/net/usb/pegasus.c
@@ -1096,6 +1096,7 @@ pegasus_set_wol(struct net_device *dev, struct
ethtool_wolinfo *wol)
{
pegasus_t *pegasus = netdev_priv(dev);
u8 reg78 = 0x04;
+ int ret;
if (wol->wolopts & ~WOL_SUPPORTED)
return -EINVAL;
@@ -1110,7 +1111,11 @@ pegasus_set_wol(struct net_device *dev, struct
ethtool_wolinfo *wol)
else
pegasus->eth_regs[0] &= ~0x10;
pegasus->wolopts = wol->wolopts;
- return set_register(pegasus, WakeupControl, reg78);
+
+ ret = set_register(pegasus, WakeupControl, reg78);
+ if (!ret)
+ ret = device_set_wakeup_enable(&pegasus->usb->dev, 1);
+ return ret;
}
static inline void pegasus_reset_wol(struct net_device *dev)
4. Find the MAC address by running ifconfig and looking at the HWaddr
field.
5. Verify with wireshark that I can see the Magic WOL packet when I run
this command on another machine:
sudo etherwake -i ethX macaddr
6. Suspend or hibernate the target machine, and then send the Magic WOL
packet from a second machine.
Am I missing any steps in testing this? Does WOL just not work for USB
ethernet devices under Linux? Perhaps just the pegasus driver doesn't
support WOL?
Probably the set_wol of pegasus is broken if wakeup has been enabled
on the USB device.
Thanks,
--
Ming Lei
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