linux-kernel - Re: [PATCH net-next] net/smc: add support for netdevice in containers.

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Date:   Wed, 11 Oct 2023 22:48:16 +0800
From:   Dust Li <dust.li@...ux.alibaba.com>
To:     Niklas Schnelle <schnelle@...ux.ibm.com>,
        Albert Huang <huangjie.albert@...edance.com>,
        Karsten Graul <kgraul@...ux.ibm.com>,
        Wenjia Zhang <wenjia@...ux.ibm.com>,
        Jan Karcher <jaka@...ux.ibm.com>
Cc:     "D. Wythe" <alibuda@...ux.alibaba.com>,
        Tony Lu <tonylu@...ux.alibaba.com>,
        Wen Gu <guwen@...ux.alibaba.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, linux-s390@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] net/smc: add support for netdevice in
 containers.

On Thu, Sep 28, 2023 at 05:04:21PM +0200, Niklas Schnelle wrote:
>On Mon, 2023-09-25 at 10:35 +0800, Albert Huang wrote:
>> If the netdevice is within a container and communicates externally
>> through network technologies like VXLAN, we won't be able to find
>> routing information in the init_net namespace. To address this issue,
>> we need to add a struct net parameter to the smc_ib_find_route function.
>> This allow us to locate the routing information within the corresponding
>> net namespace, ensuring the correct completion of the SMC CLC interaction.
>> 
>> Signed-off-by: Albert Huang <huangjie.albert@...edance.com>
>> ---
>>  net/smc/af_smc.c | 3 ++-
>>  net/smc/smc_ib.c | 7 ++++---
>>  net/smc/smc_ib.h | 2 +-
>>  3 files changed, 7 insertions(+), 5 deletions(-)
>> 
>
>I'm trying to test this patch on s390x but I'm running into the same
>issue I ran into with the original SMC namespace
>support:https://lore.kernel.org/netdev/8701fa4557026983a9ec687cfdd7ac5b3b85fd39.camel@linux.ibm.com/
>
>Just like back then I'm using a server and a client network namespace
>on the same system with two ConnectX-4 VFs from the same card and port.
>Both TCP/IP traffic as well as user-space RDMA via "qperf … rc_bw" and
>`qperf … rc_lat` work between namespaces and definitely go via the
>card.
>
>I did use "rdma system set netns exclusive" then moved the RDMA devices
>into the namespaces with "rdma dev set <rdma_dev> netns <namespace>". I
>also verified with "ip netns exec <namespace> rdma dev"
>that the RDMA devices are in the network namespace and as seen by the
>qperf runs normal RDMA does work.
>
>For reference the smc_chck tool gives me the following output:
>
>Server started on port 37373
>[DEBUG] Interfaces to check: eno4378
>Test with target IP 10.10.93.12 and port 37373
>  Live test (SMC-D and SMC-R)
>[DEBUG] Running client: smc_run /tmp/echo-clt.x0q8iO 10.10.93.12 -p
>37373
>[DEBUG] Client result: TCP 0x05000000/0x03030000
>     Failed  (TCP fallback), reasons:
>          Client:        0x05000000   Peer declined during handshake
>          Server:        0x03030000   No SMC devices found (R and D)
>
>I also checked that SMC is generally working, once I add an ISM device
>I do get SMC-D between the namespaces. Any ideas what could break SMC-R
>here?

I missed the email :(

Are you running SMC-Rv2 or v1 ?

Best regards,
Dust


>
>Thanks,
>Niklas