linux-kernel - Re: [PATCH] ip6erspan: remove the incorrect mtu limit for ip6erspan

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Message-ID: <20191008161403.GB118819@gmail.com>
Date:   Tue, 8 Oct 2019 09:14:03 -0700
From:   William Tu <u9012063@...il.com>
To:     Haishuang Yan <yanhaishuang@...s.chinamobile.com>
Cc:     "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ip6erspan: remove the incorrect mtu limit for ip6erspan

On Tue, Oct 08, 2019 at 05:56:03PM +0800, Haishuang Yan wrote:
> ip6erspan driver calls ether_setup(), after commit 61e84623ace3
> ("net: centralize net_device min/max MTU checking"), the range
> of mtu is [min_mtu, max_mtu], which is [68, 1500] by default.
> 
> It causes the dev mtu of the erspan device to not be greater
> than 1500, this limit value is not correct for ip6erspan tap
> device.
> 
> Signed-off-by: Haishuang Yan <yanhaishuang@...s.chinamobile.com>

Thanks for the patch.

Acked-by: William Tu <u9012063@...il.com>

> ---
>  net/ipv6/ip6_gre.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
> index d5779d6..787d9f2 100644
> --- a/net/ipv6/ip6_gre.c
> +++ b/net/ipv6/ip6_gre.c
> @@ -2192,6 +2192,7 @@ static void ip6erspan_tap_setup(struct net_device *dev)
>  {
>  	ether_setup(dev);
>  
> +	dev->max_mtu = 0;
>  	dev->netdev_ops = &ip6erspan_netdev_ops;
>  	dev->needs_free_netdev = true;
>  	dev->priv_destructor = ip6gre_dev_free;
> -- 
> 1.8.3.1
> 
> 
>