netdev - Re: [regression] 2.6.37+ commit 0363466866d9.... breaks tcp ipv6

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Date:	Tue, 18 Jan 2011 22:42:03 +0100
From:	Hans de Bruin <jmdebruin@...net.nl>
To:	Jesse Gross <jesse@...ira.com>
CC:	LKML <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [regression] 2.6.37+ commit 0363466866d9.... breaks tcp ipv6

On 01/18/2011 09:06 PM, Jesse Gross wrote:
> On Tue, Jan 18, 2011 at 11:52 AM, Hans de Bruin<jmdebruin@...net.nl>  wrote:
>> On 01/16/2011 09:24 PM, Hans de Bruin wrote:
>>>
>>> After last nights compile i lost the possibility to connect to ssh and
>>> http over ipv6. The connection stops at syn_sent. connections to my
>>> machine end in syn_recv. ping6 still works.
>>>
>>
>> The bisect ended in:
>>
>> 0363466866d901fbc658f4e63dd61e7cc93dd0af is the first bad commit
>> commit 0363466866d901fbc658f4e63dd61e7cc93dd0af
>> Author: Jesse Gross<jesse@...ira.com>
>> Date:   Sun Jan 9 06:23:35 2011 +0000
>>
>>     net offloading: Convert checksums to use centrally computed features.
>>
>>     In order to compute the features for other offloads (primarily
>>     scatter/gather), we need to first check the ability of the NIC to
>>     offload the checksum for the packet.  Since we have already computed
>>     this, we can directly use the result instead of figuring it out
>>     again.
>>
>>     Signed-off-by: Jesse Gross<jesse@...ira.com>
>>     Signed-off-by: David S. Miller<davem@...emloft.net>
>>
>>
>> ssh ::1  still works. And since dns still works I guess udp is not affected.
>> My nic is a:
>>
>> 09:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5752 Gigabit
>> Ethernet PCI Express (rev 02)
>
> Are you using vlans?  If so, can you please test this patch?
> http://patchwork.ozlabs.org/patch/79264/
>

No I am not using vlans. The option is even not set in the config file. 
Except for the disk less bit is a straightforward setup:

   bash-4.1# ip addr show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
     inet 127.0.0.1/8 scope host lo
     inet6 ::1/128 scope host
        valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP 
qlen 1000
     link/ether 00:1c:23:2d:73:87 brd ff:ff:ff:ff:ff:ff
     inet 10.10.0.6/16 brd 10.10.255.255 scope global eth0
     inet6 2001:610:76e:0:21c:23ff:fe2d:7387/64 scope global dynamic
        valid_lft 86399sec preferred_lft 14399sec
     inet6 fe80::21c:23ff:fe2d:7387/64 scope link
        valid_lft forever preferred_lft forever
3: sit0: <NOARP> mtu 1480 qdisc noop state DOWN
     link/sit 0.0.0.0 brd 0.0.0.0
bash-4.1# ip route show
10.10.0.0/16 dev eth0  proto kernel  scope link  src 10.10.0.6
default via 10.10.0.1 dev eth0
bash-4.1# ip -6 route show
2001:610:76e::/64 dev eth0  proto kernel  metric 256  expires 86404sec
fe80::/64 dev eth0  proto kernel  metric 256
ff00::/8 dev eth0  metric 256
default via fe80::230:18ff:feae:75d8 dev eth0  proto kernel  metric 1024 
  expires 29sec hoplimit 64
bash-4.1# iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination
bash-4.1# ip6tables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination
bash-4.1# brctl show
bridge name     bridge id               STP enabled     interfaces
bash-4.1# cat /proc/cmdline
root=/dev/nfs nfsroot=10.10.0.2:/nfs/root/psion/,v3,tcp ro ip=::: ::dhcp 
BOOT_IMAGE=nightlybuild-psion

-- 
Hans


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