netdev - Re: [RFC] Is it a bug for nfs on udp6 mode or kernel?

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Message-ID: <570EEB67.4020404@huawei.com>
Date:	Thu, 14 Apr 2016 08:59:19 +0800
From:	Ding Tianhong <dingtianhong@...wei.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	<linux-nfs-approval@...r.kernel.org>, <tom@...bertland.com>,
	Netdev <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	<dhowells@...hat.com>, <viro@...iv.linux.org.u>,
	<chuck.lever@...cle.com>
Subject: Re: [RFC] Is it a bug for nfs on udp6 mode or kernel?

On 2016/4/14 0:17, Eric Dumazet wrote:
> On Wed, 2016-04-13 at 19:28 +0800, Ding Tianhong wrote:
>> Hi everyone:
>>
>> I have met this problem when I try to test udp6 for nfs connection, my environment is:
>>
>> Server:
>> kernel: 4.1.15
>> IP:xxxx::36/64
>> MTU:1500
>> Setting: /etc/exports:/home/nfs *(rw,sync,no_subtree_check,no_root_squash)
>>
>> Client:
>> kernel: 4.1.18
>> IP:xxxx::90/64
>> MTU:1500
>> command: mount -t nfs -o vers=3,proto=udp6,rsize=4096,wsize=4096 [xxxx::36]:/home/nfs /home/tmp
>>
>> I check the nfs parameter configuration, it looks fine and could work well for proto=tcp6.
>>
>> Then I have mount correctly and try to run the command "ls", it hang.
>>
>> When I use the rsize=1024 and wsize=1024 to mount, the problem disappeared, so I guess it is the problem for GSO or GRO for UDP。
>>
>> Then I try to debug the problem, first I tcpdump the package from cline to server, and found that
>> the client have send readdirplus message to server correctly, and then the Server send a 4k package
>> to client(the big package will frag to 4 package by GSO), till now it looks fine, and the Client Nic could
>> receive the 4 skb then send to upper stack to ipv6 and udp, I found the incoming 4 package has been merged
>> to one and send to upper stack just like sunrpc, but I try to open the rpc_debug, it looks that the rpc could
>> not receive message.
>>
>>
>> I built a simple demo to test the udp stack, use the client socket to send big package to server socket, it work well,
>> so I think the udp is fine, maybe the bug is in sunrpc.
>>
>> The test is very simple, does any body met the same problem like me, thanks for any suggestion.
>>
>> Ding 
> 
> Have you tried to disable UFO ?
> 
> ethtool -K eth... ufo off
> 
> 
Hi Eric:

Already disabled, my nic don't support UFO.

Thanks.

Ding
> 
> .
>