On 2016/4/13 22:11, Benjamin Coddington wrote:
> On Wed, 13 Apr 2016, 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
>
> I had a similar problem. Do you have upstream
>
> 405c92f ("ipv6: add defensive check for CHECKSUM_PARTIAL skbs in ip_fragment")
> 682b1a9 ("ipv6: no CHECKSUM_PARTIAL on MSG_MORE corked sockets")
>
Hi Ben:
Thanks for the feedback, my kernel is 4.1.15, not merged these two patch, I
will check and try, thanks a lot.
> Turning off GSO and GRO caused sunrpc to work properly before this.
>
> https://bugzilla.redhat.com/show_bug.cgi?id=1271759
>
Sorry, I don't have permission to read this, but thanks for this message.:)
Ding
> Ben
>
