netdev - Re: [PATCH net-next v3 3/3] bridge: Extend br_fill

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Date:   Thu, 2 Jul 2020 13:05:01 +0300
From:   Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:     Horatiu Vultur <horatiu.vultur@...rochip.com>,
        roopa@...ulusnetworks.com, davem@...emloft.net, kuba@...nel.org,
        jiri@...lanox.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, bridge@...ts.linux-foundation.org,
        UNGLinuxDriver@...rochip.com
Subject: Re: [PATCH net-next v3 3/3] bridge: Extend br_fill_ifinfo to return
 MPR status

On 02/07/2020 11:13, Horatiu Vultur wrote:
> This patch extends the function br_fill_ifinfo to return also the MRP
> status for each instance on a bridge. It also adds a new filter
> RTEXT_FILTER_MRP to return the MRP status only when this is set, not to
> interfer with the vlans. The MRP status is return only on the bridge
> interfaces.
> 
> Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>
> ---
>  include/uapi/linux/rtnetlink.h |  1 +
>  net/bridge/br_netlink.c        | 25 ++++++++++++++++++++++++-
>  2 files changed, 25 insertions(+), 1 deletion(-)
> 

Acked-by: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>

> diff --git a/include/uapi/linux/rtnetlink.h b/include/uapi/linux/rtnetlink.h
> index 879e64950a0a2..9b814c92de123 100644
> --- a/include/uapi/linux/rtnetlink.h
> +++ b/include/uapi/linux/rtnetlink.h
> @@ -778,6 +778,7 @@ enum {
>  #define RTEXT_FILTER_BRVLAN	(1 << 1)
>  #define RTEXT_FILTER_BRVLAN_COMPRESSED	(1 << 2)
>  #define	RTEXT_FILTER_SKIP_STATS	(1 << 3)
> +#define RTEXT_FILTER_MRP	(1 << 4)
>  
>  /* End of information exported to user level */
>  
> diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
> index 240e260e3461c..c532fa65c9834 100644
> --- a/net/bridge/br_netlink.c
> +++ b/net/bridge/br_netlink.c
> @@ -453,6 +453,28 @@ static int br_fill_ifinfo(struct sk_buff *skb,
>  		rcu_read_unlock();
>  		if (err)
>  			goto nla_put_failure;
> +
> +		nla_nest_end(skb, af);
> +	}
> +
> +	if (filter_mask & RTEXT_FILTER_MRP) {
> +		struct nlattr *af;
> +		int err;
> +
> +		if (!br_mrp_enabled(br) || port)
> +			goto done;
> +
> +		af = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
> +		if (!af)
> +			goto nla_put_failure;
> +
> +		rcu_read_lock();
> +		err = br_mrp_fill_info(skb, br);
> +		rcu_read_unlock();
> +
> +		if (err)
> +			goto nla_put_failure;
> +
>  		nla_nest_end(skb, af);
>  	}
>  
> @@ -516,7 +538,8 @@ int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
>  	struct net_bridge_port *port = br_port_get_rtnl(dev);
>  
>  	if (!port && !(filter_mask & RTEXT_FILTER_BRVLAN) &&
> -	    !(filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED))
> +	    !(filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED) &&
> +	    !(filter_mask & RTEXT_FILTER_MRP))
>  		return 0;
>  
>  	return br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, nlflags,
>