linux-kernel - Re: [PATCH net] ipv6: don't auto-add link-local address to lag ports

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Date:   Wed, 18 Mar 2020 11:02:01 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Jarod Wilson <jarod@...hat.com>, linux-kernel@...r.kernel.org
Cc:     Moshe Levi <moshele@...lanox.com>,
        Marcelo Ricardo Leitner <mleitner@...hat.com>,
        netdev@...r.kernel.org
Subject: Re: [PATCH net] ipv6: don't auto-add link-local address to lag ports



On 3/18/20 7:06 AM, Jarod Wilson wrote:
> Bonding slave and team port devices should not have link-local addresses
> automatically added to them, as it can interfere with openvswitch being
> able to properly add tc ingress.
> 
> Reported-by: Moshe Levi <moshele@...lanox.com>
> CC: Marcelo Ricardo Leitner <mleitner@...hat.com>
> CC: netdev@...r.kernel.org
> Signed-off-by: Jarod Wilson <jarod@...hat.com>


This does not look a net candidate to me, unless the bug has been added recently ?

The absence of Fixes: tag is a red flag for a net submission.

By adding a Fixes: tag, you are doing us a favor, please.

Thanks.

> ---
>  net/ipv6/addrconf.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
> index 46d614b611db..aed891695084 100644
> --- a/net/ipv6/addrconf.c
> +++ b/net/ipv6/addrconf.c
> @@ -3296,6 +3296,10 @@ static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
>  	if (netif_is_l3_master(idev->dev))
>  		return;
>  
> +	/* no link local addresses on bond slave or team port devices */
> +	if (netif_is_lag_port(idev->dev))
> +		return;
> +
>  	ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
>  
>  	switch (idev->cnf.addr_gen_mode) {
>