netdev - Re: [PATCH net] ipv6: prevent only DAD and RS sending for IFF_NO

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Date:   Tue, 10 Jan 2023 09:59:34 +0100
From:   Paolo Abeni <pabeni@...hat.com>
To:     Xin Long <lucien.xin@...il.com>, David Ahern <dsahern@...nel.org>
Cc:     network dev <netdev@...r.kernel.org>, davem@...emloft.net,
        kuba@...nel.org, Eric Dumazet <edumazet@...gle.com>,
        Jiri Pirko <jiri@...nulli.us>, LiLiang <liali@...hat.com>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        jianghaoran <jianghaoran@...inos.cn>,
        Jay Vosburgh <fubar@...ibm.com>
Subject: Re: [PATCH net] ipv6: prevent only DAD and RS sending for
 IFF_NO_ADDRCONF

On Sun, 2023-01-08 at 11:58 -0500, Xin Long wrote:
> On Sat, Jan 7, 2023 at 9:04 PM David Ahern <dsahern@...nel.org> wrote:
> > 
> > On 1/6/23 9:51 AM, Xin Long wrote:
> > > Currently IFF_NO_ADDRCONF is used to prevent all ipv6 addrconf for the
> > > slave ports of team, bonding and failover devices and it means no ipv6
> > > packets can be sent out through these slave ports. However, for team
> > > device, "nsna_ping" link_watch requires ipv6 addrconf. Otherwise, the
> > > link will be marked failure.
> > > 
> > > The orginal issue fixed by IFF_NO_ADDRCONF was caused by DAD and RS
> > > packets sent by slave ports in commit c2edacf80e15 ("bonding / ipv6: no
> > > addrconf for slaves separately from master") where it's using IFF_SLAVE
> > > and later changed to IFF_NO_ADDRCONF in commit 8a321cf7becc ("net: add
> > > IFF_NO_ADDRCONF and use it in bonding to prevent ipv6 addrconf").
> > 
> > That patch is less than a month old, and you are making changes again.
> Hi, David,
> 
> That patch will not change anything, and it's an improvement. the
> problem is the commit:
> 
> 0aa64df30b38 ("net: team: use IFF_NO_ADDRCONF flag to prevent ipv6 addrconf")
> 
> So it affects the team driver only, and I should've done more team driver tests.
> Sorry for having to touch the IPv6 code for this problem in the team driver.
> 
> > 
> > I think you should add some test cases that cover the permutations you
> > want along with any possible alternative / negative use cases.
> IFF_NO_ADDRCONF are used by team/bonding/failover, I will try to add
> a kselftest for this with team/bonding.

Please include such test in the next iteration, thanks!

Paolo