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

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Message-ID: <81dbcf7d-52f4-4dc0-2355-27198685da7b@intel.com>
Date:   Sun, 23 Apr 2017 09:46:09 +0300
From:   "Neftin, Sasha" <sasha.neftin@...el.com>
To:     Florian Fainelli <f.fainelli@...il.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 4/20/2017 00:15, Florian Fainelli wrote:
> 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?

Please, work with TSO turned off so. There is no patch for this specific 
problem.