linux-kernel - Re: Network issue on 3.10 rcs, bisected

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Message-ID: <CALnjE+qTqQDfrBxEogo6UJm63=USX7rgO=d4fasF1Cc-S3nQ1g@mail.gmail.com>
Date:	Thu, 30 May 2013 16:13:24 -0700
From:	Pravin Shelar <pshelar@...ira.com>
To:	Joao Correia <joaomiguelcorreia@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, davem@...emloft.net,
	netdev@...r.kernel.org
Subject: Re: Network issue on 3.10 rcs, bisected

On Thu, May 30, 2013 at 2:14 PM, Joao Correia
<joaomiguelcorreia@...il.com> wrote:
> On Thu, May 30, 2013 at 5:48 PM, Pravin Shelar <pshelar@...ira.com> wrote:
>> On Wed, May 29, 2013 at 12:53 PM, Joao Correia
>> <joaomiguelcorreia@...il.com> wrote:
>>> On Wed, May 29, 2013 at 7:59 PM, Pravin Shelar <pshelar@...ira.com> wrote:
>>>>
>>>> On Wed, May 29, 2013 at 4:37 AM, Joao Correia
>>>> <joaomiguelcorreia@...il.com> wrote:
>>>> > Hello list
>>>> >
>>>> > While trying the rc's for 3.10, i've stumbled upon a problem where
>>>> > networking does not work at all. Iptables will show packet counts going up,
>>>> > but nothing actually reaches the programs.
>>>> >
>>>> > I'm running fedora under hyper-v 3 (a windows 2012 host). Only tested ipv4
>>>> > traffic, and everything times out (ping, telnet to open ports) on both
>>>> > directions. The networking devices come up apparently ok - has static ip
>>>> > set, and dmesg shows no errors (although i don't have many debugging options
>>>> > enabled).
>>>> >
>>>> > I bisected this, and git blames commit
>>>> > ec5f061564238892005257c83565a0b58ec79295 (net: ill link between CSUM and SG
>>>> > features.). I can't revert it cleanly on current rc's.
>>>> >
>>>> Can you also send network features set on the device?
>>>> ethtool -k <dev>
>>>
>>>
>>> As requested:
>>> Features for eth0:
>>> rx-checksumming: off [fixed]
>>> tx-checksumming: off
>>>     tx-checksum-ipv4: off [fixed]
>>>     tx-checksum-ip-generic: off [fixed]
>>>     tx-checksum-ipv6: off [fixed]
>>>     tx-checksum-fcoe-crc: off [fixed]
>>>     tx-checksum-sctp: off [fixed]
>>> scatter-gather: on
>>>     tx-scatter-gather: on
>>>     tx-scatter-gather-fraglist: off [fixed]
>>> tcp-segmentation-offload: off
>>>     tx-tcp-segmentation: off [fixed]
>>>     tx-tcp-ecn-segmentation: off [fixed]
>>>     tx-tcp6-segmentation: off [fixed]
>>> udp-fragmentation-offload: off [fixed]
>>> generic-segmentation-offload: on
>>> generic-receive-offload: on
>>> large-receive-offload: off [fixed]
>>> rx-vlan-offload: off
>>> tx-vlan-offload: on
>>> ntuple-filters: off [fixed]
>>> receive-hashing: off [fixed]
>>> highdma: off [fixed]
>>> tx-vlan-ctag-hw-insert: on [fixed]
>>> rx-vlan-ctag-hw-parse: off [fixed]
>>> rx-vlan-ctag-filter: off [fixed]
>>> tx-vlan-stag-hw-insert: off [fixed]
>>> rx-vlan-stag-hw-parse: off [fixed]
>>> rx-vlan-stag-filter: off [fixed]
>>> vlan-challenged: off [fixed]
>>> tx-lockless: off [fixed]
>>> netns-local: off [fixed]
>>> tx-gso-robust: off [fixed]
>>> tx-fcoe-segmentation: off [fixed]
>>> tx-gre-segmentation: off [fixed]
>>> tx-udp_tnl-segmentation: off [fixed]
>>> fcoe-mtu: off [fixed]
>>> tx-nocache-copy: off
>>> loopback: off [fixed]
>>> rx-fcs: off [fixed]
>>> rx-all: off [fixed]
>>>
>>> The output is similar on a working (3.9) and a bad (3.10) kernel.
>>> diff-ing both outputs shows:
>>> tx-vlan-stag-hw-insert: off [fixed]
>>> rx-vlan-stag-hw-parse: off [fixed]
>>> rx-vlan-stag-filter: off [fixed]
>>> as last on the broken kernels.
>>>
>>
>> I could not reproduce it, I will try it on VM. Meanwhile can you turn
>> off feature "sg" and try same test ?
>
> Hello
>
> Your hint was spot-on. With sg off, i can't reproduce the problem and
> networking seems fine. It works fine either way on 3.9, so this is a
> regression for 3.10.
>
Nice.
but still this does not look right. Can you tell me driver for the nic?
`ethtool -i <dev>`

Thanks,
Pravin.
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