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Date: Thu, 30 May 2013 09:48:18 -0700
Message-ID: <CALnjE+q-dbK0bha_J848mb7sdmLi7a5-BMjKng+wQ8KaDFL=LQ@mail.gmail.com>
Subject: Re: Network issue on 3.10 rcs, bisected
From: Pravin Shelar <pshelar@nicira.com>
To: Joao Correia <joaomiguelcorreia@gmail.com>
Cc: LKML <linux-kernel@vger.kernel.org>, davem@davemloft.net,
        netdev@vger.kernel.org
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On Wed, May 29, 2013 at 12:53 PM, Joao Correia
<joaomiguelcorreia@gmail.com> wrote:
> On Wed, May 29, 2013 at 7:59 PM, Pravin Shelar <pshelar@nicira.com> wrote:
>>
>> On Wed, May 29, 2013 at 4:37 AM, Joao Correia
>> <joaomiguelcorreia@gmail.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 ?

Thanks.

> Thank you for your time,
> Joao Correia
> CIUBI
> Universidade da Beira Interior
> Portugal
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