netdev - Re: [Intel-wired-lan] NFS over NAT causes e1000e transmit hangs

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Date:   Wed, 19 Apr 2017 14:15:34 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     "Neftin, Sasha" <sasha.neftin@...el.com>,
        Eric Dumazet <eric.dumazet@...il.com>
Cc:     netdev@...r.kernel.org, intel-wired-lan@...ts.osuosl.org
Subject: Re: [Intel-wired-lan] NFS over NAT causes e1000e transmit hangs

On 04/19/2017 01:52 AM, Neftin, Sasha wrote:
> On 4/18/2017 22:05, Florian Fainelli wrote:
>> On 04/18/2017 12:03 PM, Eric Dumazet wrote:
>>> On Tue, 2017-04-18 at 11:18 -0700, Florian Fainelli wrote:
>>>> Hi,
>>>>
>>>> I am using NFS over a NAT with two e1000e adapters and with eth1 being
>>>> the LAN interface and eth0 the WAN interface. The kernel is Ubuntu's
>>>> 16.10 kernel: 4.8.0-46-generic. The device doing NAT over NFS is just
>>>> mounting a remote folder and doing normal execution/file accesses. It's
>>>> enough to untar a file from this device onto a NFS share to expose the
>>>> problem.
>>>>
>>>> The transmit hangs look like the ones below, doing a rmmod/insmod does
>>>> not help eliminated the problem, nor does a power cycle. Stopping the
>>>> NFS over NAT definitively does let the adapter recover.
>>> Is this NFS over TCP or UDP ?
>> This is NFS over TCP mounted with the following:
>>
>> type nfs
>> (rw,relatime,vers=3,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,port=2049,timeo=70,retrans=3,sec=sys,local_lock=none,addr=X.X.X.X)
>>
>>
>> Thanks Eric!
> 
> Please, try disable TCP segmentation offload: ethtool -K <adapter> tso off.

I am not able to reproduce the hangs with TSO turned off. Is there a
specific patch you would want me to try?
-- 
Florian