netdev - IPv6 stops working after ethtool diagnostic

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Date:	Tue, 15 Jun 2010 12:05:59 -0600
From:	"Tantilov, Emil S" <emil.s.tantilov@...el.com>
To:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:	Stephen Hemminger <shemminger@...tta.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"Pieper, Jeffrey E" <jeffrey.e.pieper@...el.com>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>
Subject: IPv6 stops working after ethtool diagnostic

We ran into a problem on net-next where IPv6 traffic fails after running ethtool -t:

Steps to reproduce:
1. ip addr show eth0
170: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:1b:21:53:0a:d6 brd ff:ff:ff:ff:ff:ff
    inet 190.0.15.5/16 brd 190.0.255.255 scope global eth0
    inet6 fec0::1505/112 scope site 
       valid_lft forever preferred_lft forever
    inet6 fe80::21b:21ff:fe53:ad6/64 scope link 
       valid_lft forever preferred_lft forever

2. ping6 -I eth0 fec0::1314
PING fec0::1314(fec0::1314) from fec0::1505 eth0: 56 data bytes
64 bytes from fec0::1314: icmp_seq=1 ttl=64 time=0.130 ms
64 bytes from fec0::1314: icmp_seq=2 ttl=64 time=0.119 ms
64 bytes from fec0::1314: icmp_seq=3 ttl=64 time=0.167 ms

3 ethtool -t eth0 (ifconfig eth0 down/up has the same effect)

4. ping6 -I eth0 fec0::1314
connect: Network is unreachable

5. ip addr show eth0
170: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:1b:21:53:0a:d6 brd ff:ff:ff:ff:ff:ff
    inet 190.0.15.5/16 brd 190.0.255.255 scope global eth0
    inet6 fec0::1505/112 scope site 
       valid_lft forever preferred_lft forever
    inet6 fe80::21b:21ff:fe53:ad6/64 scope link 
       valid_lft forever preferred_lft forever

Thanks,
Emil--
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