Date: Thu, 3 Jul 2008 23:35:17 +0200 From: Luigi Rizzo <rizzo@iet.unipi.it> To: Andriy Gapon <avg@icyb.net.ua> Cc: pyunyh@gmail.com, freebsd-stable@freebsd.org, yongari@freebsd.org Subject: Re: 6.3 nfe: dead after system reset Message-ID: <20080703213517.GA76155@onelab2.iet.unipi.it> In-Reply-To: <486D440F.1090601@icyb.net.ua> References: <47A3041D.5050402@icyb.net.ua> <20080201123603.GA14050@cdnetworks.co.kr> <47A321BB.1060708@icyb.net.ua> <47A32501.7080703@icyb.net.ua> <20080204035242.GA28554@cdnetworks.co.kr> <47C2BC50.5040702@icyb.net.ua> <47C2DBEF.301@icyb.net.ua> <20080226073633.GC47750@cdnetworks.co.kr> <486D440F.1090601@icyb.net.ua>
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On Fri, Jul 04, 2008 at 12:26:39AM +0300, Andriy Gapon wrote: > > As they say - long time, no see :-) > I am back with some more details, but still with no insights. > > Let me refresh an essence of the issue. > The issue: after 'abrupt' reset/reboot of a system my nfe interface is dead. > That is, if I do a graceful reboot (e.g. via shutdown -r) everything is > ok, ditto if I do power-down (whether graceful or not) and the power-up. > The problem happens only if I press reset button and then boot up. > > Details. > The issue can not be reproduced with nve driver. > Moreover, when I reproduce the problem with nfe, then kldunload nfe > driver, kldload nve driver - nve interface is alive. Then kldunload nve, > kldload nfe - nfe interface is dead again. > > Specification of dead. > There are no errors. ifconfig shows the same output (active, media, up, > etc) as in normal case. But I can not ping any host on local network > (connected to the same switch), ping outputs "Host is down". tcpdump > also doesn't show any incoming traffic. > > More details. > I was able to verify that packets do actually go through the interface. > When I try to ping some machine I see (on the other host) arp requests > for its ethernet address. All address in arp packets are correct > (ethernet and ip). So the interface works for outgoing packets, but > somehow loses incoming arp replies. Not sure if thap happens in the NIC > or in the driver itself (see the above nve/nfe live replacement experiment). these symptoms (outgoing traffic is ok, incoming not received) are similar to what i see in other conditions on my machine, see http://www.mavetju.org/mail/view_message.php?list=freebsd-net&id=2730309 it is interesting that if_nve works ok, maybe we can compare the two drivers and see if they initialize the device in different ways (or test for receive interrupts in different ways) cheers luigi
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