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Date: Thu, 11 Oct 2012 10:14:14 +0200
From: Ondrej Zary <linux@...nbow-software.org>
To: Michael Leun <lkml20120218@...ton.leun.net>
Cc: Greg KH <gregkh@...uxfoundation.org>, davem@...emloft.net,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [3.5 regression / mcs7830 / bisected] bridge constantly toggeling between disabled and forwarding
On Tuesday 09 October 2012, Michael Leun wrote:
> On Tue, 9 Oct 2012 09:21:31 +0200
>
> Ondrej Zary <linux@...nbow-software.org> wrote:
> > On Tuesday 09 October 2012, Michael Leun wrote:
> > > On Thu, 27 Sep 2012 10:39:05 -0700
> > >
> > > Greg KH <gregkh@...uxfoundation.org> wrote:
> > > > On Tue, Jul 24, 2012 at 01:36:34AM +0200, Michael Leun wrote:
> > > > > On Mon, 23 Jul 2012 09:15:04 +0200
> > > > > Michael Leun <lkml20120218@...ton.leun.net> wrote:
> > > > >
> > > > > [see issue description below]
> > > > >
> > > > > Bisecting yielded
> > > > >
> > > > > b1ff4f96fd1c63890d78d8939c6e0f2b44ce3113 is the first bad commit
> > > > > commit b1ff4f96fd1c63890d78d8939c6e0f2b44ce3113
> > > > > Author: Ondrej Zary <linux@...nbow-software.org>
> > > > > Date: Fri Jun 1 10:29:08 2012 +0000
> > > > >
> > > > > mcs7830: Implement link state detection
> > > > >
> > > > > Add .status callback that detects link state changes.
> > > > > Tested with MCS7832CV-AA chip (9710:7830, identified as
> > > > > rev.C by the driver). Fixes
> > > > > https://bugzilla.kernel.org/show_bug.cgi?id=28532
> > > > >
> > > > > Signed-off-by: Ondrej Zary <linux@...nbow-software.org>
> > > > > Signed-off-by: David S. Miller <davem@...emloft.net>
> > > > >
> > > > > :040000 040000 5480780cb5e75c57122a621fc3bab0108c16be27
> > > > >
> > > > > d97efd9cc0a465dff76bcd3a3c547f718f2a5345 M drivers
> > > > >
> > > > >
> > > > > Reverting that from 3.5 makes the issue go away.
> > > >
> > > > Did this ever get resolved in 3.6-rc7 or any older kernel? I
> > > > can't revert the patch from 3.5.y unless it's also fixed in
> > > > Linus's tree.
> > >
> > > Please excuse me for answering a bit late.
> > >
> > > No, that never got resolved, I still have the problem with 3.6 but
> > > I'm not shure about the correct solution.
> > >
> > > Maybe link state detection just does not work with some of that
> > > devices and we should have an possibility to enable/disable it per
> > > device, maybe it can be handeled with an blacklist of not working
> > > devices, maybe it could be fixed - I do not know and also do not
> > > know how to find out.
> > >
> > > But I'm willing to test.
> >
> > Does the problem appear only in a bridge? Or the link state detection
> >is completely wrong?
>
> As testing with patch below shows, it also happens without bridge, but
> I did not notice so far, because that log message I was complainig
> about originally of course comes from the bridge code.
>
> > Can you please apply this debug patch and provide the output?
> >
> > --- a/drivers/net/usb/mcs7830.c
> > +++ b/drivers/net/usb/mcs7830.c
> > @@ -638,6 +638,7 @@ static void mcs7830_status(struct usbnet *dev,
> > struct urb *urb) return;
> >
> > link = !(buf[1] & 0x20);
> > + printk("netif_carrier_ok=%d, link=%d, buf[0]=0x%02x,
> > buf[1]=0x%02x\n", netif_carrier_ok(dev->net), link, buf[0], buf[1]);
> > if (netif_carrier_ok(dev->net) != link) { if (link) {
> > netif_carrier_on(dev->net);
>
> As far as I've seen:
>
> Bring device up - link state toggles a few times and stabilizes to up
>
> Start ping - link state toggles for every packet
>
> Test below done without bridge involved.
>
> Note: I renamed the interface to ue7 (I happen to have several of that
> devices).
Please try this patch, it should fix the problem.
(Remove the previous debug patch first.)
mcs7830: Fix link state detection
The device had an undocumented "feature": it can provide a sequence of
spurious link-down status data even if the link is up all the time.
A sequence of 10 was seen so update the link state only after the device
reports the same link state 20 times.
Signed-off-by: Ondrej Zary <linux@...nbow-software.org>
---
drivers/net/usb/mcs7830.c | 21 ++++++++++++++-------
1 files changed, 14 insertions(+), 7 deletions(-)
diff --git a/drivers/net/usb/mcs7830.c b/drivers/net/usb/mcs7830.c
index 03c2d8d..3a02a5d 100644
--- a/drivers/net/usb/mcs7830.c
+++ b/drivers/net/usb/mcs7830.c
@@ -117,6 +117,7 @@ enum {
struct mcs7830_data {
u8 multi_filter[8];
u8 config;
+ u8 link_counter;
};
static const char driver_name[] = "MOSCHIP usb-ethernet driver";
@@ -633,19 +634,25 @@ static void mcs7830_status(struct usbnet *dev, struct urb *urb)
{
u8 *buf = urb->transfer_buffer;
bool link;
+ struct mcs7830_data *data = mcs7830_get_data(dev);
if (urb->actual_length < 16)
return;
link = !(buf[1] & 0x20);
if (netif_carrier_ok(dev->net) != link) {
- if (link) {
- netif_carrier_on(dev->net);
- usbnet_defer_kevent(dev, EVENT_LINK_RESET);
- } else
- netif_carrier_off(dev->net);
- netdev_dbg(dev->net, "Link Status is: %d\n", link);
- }
+ data->link_counter++;
+ if (data->link_counter > 20) {
+ data->link_counter = 0;
+ if (link) {
+ netif_carrier_on(dev->net);
+ usbnet_defer_kevent(dev, EVENT_LINK_RESET);
+ } else
+ netif_carrier_off(dev->net);
+ netdev_dbg(dev->net, "Link Status is: %d\n", link);
+ }
+ } else
+ data->link_counter = 0;
}
static const struct driver_info moschip_info = {
--
Ondrej Zary
--
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