netdev - Re: NFS over NAT causes e1000e transmit hangs

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Date:   Tue, 18 Apr 2017 12:05:11 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     intel-wired-lan@...ts.osuosl.org, jeffrey.t.kirsher@...el.com,
        netdev@...r.kernel.org
Subject: Re: NFS over NAT causes e1000e transmit hangs

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!
-- 
Florian