netdev - Re: [Bugme-new] [Bug 16187] New: Carrier detection failed in dhcpcd when link is up

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Date:	Wed, 16 Jun 2010 07:46:23 +0200
From:	Christian Casteyde <casteyde.christian@...e.fr>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	netdev@...r.kernel.org, Grant Grundler <grundler@...isc-linux.org>,
	Kyle McMartin <kyle@...artin.ca>,
	bugzilla-daemon@...zilla.kernel.org,
	bugme-daemon@...zilla.kernel.org
Subject: Re: [Bugme-new] [Bug 16187] New: Carrier detection failed in dhcpcd when link is up

Exact, my kernel config is:
-*- Generic Media Independent Interface device support
[*]   "Tulip" family network device support
<*>   ULi M526x controller support

Le mardi 15 juin 2010 23:24:18, Andrew Morton a écrit :
> (switched to email.  Please respond via emailed reply-to-all, not via the
> bugzilla web interface).
> 
> On Sat, 12 Jun 2010 15:15:31 GMT
> 
> bugzilla-daemon@...zilla.kernel.org wrote:
> > https://bugzilla.kernel.org/show_bug.cgi?id=16187
> > 
> >            Summary: Carrier detection failed in dhcpcd when link is up
> >            Product: Networking
> >            Version: 2.5
> >     
> >     Kernel Version: 2.6.35-rc2
> >     
> >           Platform: All
> >         
> >         OS/Version: Linux
> >         
> >               Tree: Mainline
> >             
> >             Status: NEW
> >           
> >           Severity: normal
> >           Priority: P1
> >          
> >          Component: Other
> >         
> >         AssignedTo: acme@...stprotocols.net
> >         ReportedBy: casteyde.christian@...e.fr
> >         Regression: Yes
> > 
> > Created an attachment (id=26742)
> > 
> >  --> (https://bugzilla.kernel.org/attachment.cgi?id=26742)
> > 
> > lspci output for 2.6.34 on my computer
> > 
> > Kernel at least 2.6.35-rc2, 2.6.34 works fine
> 
> Seems to be post-2.6.34 breakage in the tulip driver.
> 
> > Athlon X2 3000 in 64bits mode
> > Slackware 13.1
> > "Ethernet controller: ALi Corporation ULi 1689,1573 integrated ethernet.
> > (rev 40)" (from lspci)
> > 
> > Since 2.6.35-rc2 (didn't checked -rc1), dhcpcd hangs fails to detect
> > carrier appearance at boot.
> > 
> > The Slackware network script uses dhcpcd to bring DHCP interfaces up. At
> > boot, it seems my network device doesn't have the link up immediatly.
> > dhcpcd tries to bring it up, and wait for the carrier. The carrier
> > indeed goes up, but dhcpcd gets absolutly no notification of that, and
> > therefore times out.
> > 
> > logs says that:
> > Jun 12 16:53:58 sirius logger: /etc/rc.d/rc.inet1:  /sbin/route add -net
> > 127.0.0.0 netmask 255.0.0.0 lo
> > Jun 12 16:53:58 sirius logger: /etc/rc.d/rc.inet1:  /sbin/dhcpcd -t 10 
> > eth0 Jun 12 16:53:58 sirius dhcpcd: version 5.2.2 starting
> > Jun 12 16:53:58 sirius kernel: ADDRCONF(NETDEV_UP): eth0: link is not
> > ready Jun 12 16:53:58 sirius dhcpcd: eth0: waiting for carrier
> > Jun 12 16:54:01 sirius kernel: uli526x: eth0 NIC Link is Up 100 Mbps Full
> > duplex
> > Jun 12 16:54:01 sirius kernel: ADDRCONF(NETDEV_CHANGE): eth0: link
> > becomes ready
> > then dhcpcd times out a little later (10 seconds as -t 10 is specified).
> > 
> > If I use the -K option (no carrier detection), and does ifconfig eth0 up
> > just before issueing the dhcpcd command, dhcpcd doesn't wait for the
> > carrier and gets a lease correctly.
> > 
> > Reversely, with the 2.6.34 kernel, dhcpcd indeed gets the link up
> > notification, and gets the lease immediatly. In this case, the log says:
> > 
> > Jun 12 17:04:21 sirius logger: /etc/rc.d/rc.inet1:  /sbin/route add -net
> > 127.0.0.0 netmask 255.0.0.0 lo
> > Jun 12 17:04:21 sirius logger: /etc/rc.d/rc.inet1:  /sbin/dhcpcd -t 10 
> > eth0 Jun 12 17:04:22 sirius dhcpcd: version 5.2.2 starting
> > Jun 12 17:04:22 sirius kernel: ADDRCONF(NETDEV_UP): eth0: link is not
> > ready Jun 12 17:04:22 sirius dhcpcd: eth0: waiting for carrier
> > Jun 12 17:04:25 sirius dhcpcd: eth0: carrier acquired
> > Jun 12 17:04:25 sirius kernel: uli526x: eth0 NIC Link is Up 100 Mbps Full
> > duplex
> > Jun 12 17:04:25 sirius kernel: ADDRCONF(NETDEV_CHANGE): eth0: link
> > becomes ready
> > Jun 12 17:04:25 sirius dhcpcd: eth0: broadcasting for a lease
> > Jun 12 17:04:29 sirius dhcpcd: eth0: offered 192.168.1.3 from 192.168.1.1
> > Jun 12 17:04:29 sirius dhcpcd: eth0: acknowledged 192.168.1.3 from
> > 192.168.1.1 Jun 12 17:04:29 sirius dhcpcd: eth0: checking for
> > 192.168.1.3
> > Jun 12 17:04:34 sirius dhcpcd: eth0: leased 192.168.1.3 for 864000
> > seconds Jun 12 17:04:34 sirius dhcpcd: forking to background
> > 
> > As you can see, dhcpcd asks for a lease as soon as the kernel tells it
> > the link is up (message "carrier acquired").
> > 
> > Therefore, I think 2.6.35-rc* notification of carrier is broken, and at
> > least it broke dhcpcd way of watching the link.
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