linux-kernel - Re: [PATCH net-next v2 2/2] net/smc: support ipv4 mapped ipv6 addr client for smc-r v2

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Message-ID: <20241210105947.466674a4.pasic@linux.ibm.com>
Date: Tue, 10 Dec 2024 10:59:47 +0100
From: Halil Pasic <pasic@...ux.ibm.com>
To: Guangguan Wang <guangguan.wang@...ux.alibaba.com>
Cc: Wenjia Zhang <wenjia@...ux.ibm.com>, jaka@...ux.ibm.com,
        alibuda@...ux.alibaba.com, tonylu@...ux.alibaba.com,
        guwen@...ux.alibaba.com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, horms@...nel.org,
        linux-rdma@...r.kernel.org, linux-s390@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Dust Li
 <dust.li@...ux.alibaba.com>,
        Halil Pasic <pasic@...ux.ibm.com>
Subject: Re: [PATCH net-next v2 2/2] net/smc: support ipv4 mapped ipv6 addr
 client for smc-r v2

On Tue, 10 Dec 2024 15:07:04 +0800
Guangguan Wang <guangguan.wang@...ux.alibaba.com> wrote:

> On 2024/12/10 04:44, Halil Pasic wrote:
> > On Mon, 9 Dec 2024 20:36:45 +0800
> > Guangguan Wang <guangguan.wang@...ux.alibaba.com> wrote:
> >   
> >>> I believe we would like to have a v3 here. Also I'm not sure
> >>> checking on saddr is sufficient, but I didn't do my research on
> >>> that question yet.
> >>>
> >>> Regards,
> >>> Halil    
> >>
> >> Did you mean to research whether the daddr should be checked too?  
> > 
> > Right! Or is it implied that if saddr is a ipv4 mapped ipv6 addr
> > then the daddr must be ipv4 mapped ipv6 addr as well?
> > 
> > Regards,
> > Halil  
> 
> I did a test by iperf3:
> A server with IPV4 addr 11.213.5.33/24 and real IPV6 addr 2012::1/64.
> A client with IPV4 addr 11.213.5.5/24 and real IPV6 addr 2012::2/64.
> iperf3 fails to run when server listen on IPV6 addr and client connect
> to server using IPV4 mapped IPV6 addr. commands show below:
> server: smc_run iperf3 -s -6 -B 2012::1
> client: smc_run iperf3 -t 10 -c 2012::1 -6 -B ::ffff:11.213.5.5
> 
> Failure happened due to the connect() function got the errno -EAFNOSUPPORT,
> I also located the kernel code where the -EAFNOSUPPORT is returned
> (https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/tree/net/ipv6/ip6_output.c#:~:text=err%20%3D%20%2DEAFNOSUPPORT%3B).

Thanks! That is enough for me!