netdev - Re: [net-next v2 03/11] net: bridge: mcast: prepare mdb netlink for mcast router split

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Date:   Tue, 11 May 2021 12:13:17 +0300
From:   Nikolay Aleksandrov <nikolay@...dia.com>
To:     Linus Lüssing <linus.luessing@...3.blue>,
        netdev@...r.kernel.org
Cc:     Roopa Prabhu <roopa@...dia.com>, Jakub Kicinski <kuba@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        bridge@...ts.linux-foundation.org, b.a.t.m.a.n@...ts.open-mesh.org,
        linux-kernel@...r.kernel.org
Subject: Re: [net-next v2 03/11] net: bridge: mcast: prepare mdb netlink for
 mcast router split

On 09/05/2021 22:45, Linus Lüssing wrote:
> In preparation for the upcoming split of multicast router state into
> their IPv4 and IPv6 variants and to avoid IPv6 #ifdef clutter later add
> some inline functions for the protocol specific parts in the mdb router
> netlink code. Also the we need iterate over the port instead of router
> list to be able put one router port entry with both the IPv4 and IPv6
> multicast router info later.
> 
> Signed-off-by: Linus Lüssing <linus.luessing@...3.blue>
> ---
>  net/bridge/br_mdb.c | 39 ++++++++++++++++++++++++++++++++++-----
>  1 file changed, 34 insertions(+), 5 deletions(-)
> 
> diff --git a/net/bridge/br_mdb.c b/net/bridge/br_mdb.c
> index d61def8..6937d3b 100644
> --- a/net/bridge/br_mdb.c
> +++ b/net/bridge/br_mdb.c
> @@ -16,29 +16,58 @@
>  
>  #include "br_private.h"
>  
> +static inline bool br_rports_have_mc_router(struct net_bridge *br)
> +{
> +	return !hlist_empty(&br->ip4_mc_router_list);
> +}
> +
> +static inline bool
> +br_ip4_rports_get_timer(struct net_bridge_port *port, unsigned long *timer)
> +{
> +	*timer = br_timer_value(&port->ip4_mc_router_timer);
> +	return !hlist_unhashed(&port->ip4_rlist);
> +}
> +
> +static inline bool
> +br_ip6_rports_get_timer(struct net_bridge_port *port, unsigned long *timer)
> +{
> +	*timer = 0;
> +	return false;
> +}
> +

Same comment about inlines in .c files, please move them to br_private.h

>  static int br_rports_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
>  			       struct net_device *dev)
>  {
>  	struct net_bridge *br = netdev_priv(dev);
> -	struct net_bridge_port *p;
> +	bool have_ip4_mc_rtr, have_ip6_mc_rtr;
> +	unsigned long ip4_timer, ip6_timer;
>  	struct nlattr *nest, *port_nest;
> +	struct net_bridge_port *p;
>  
> -	if (!br->multicast_router || hlist_empty(&br->ip4_mc_router_list))
> +	if (!br->multicast_router)
> +		return 0;
> +
> +	if (!br_rports_have_mc_router(br))
>  		return 0;
>  
>  	nest = nla_nest_start_noflag(skb, MDBA_ROUTER);
>  	if (nest == NULL)
>  		return -EMSGSIZE;
>  
> -	hlist_for_each_entry_rcu(p, &br->ip4_mc_router_list, ip4_rlist) {
> -		if (!p)
> +	list_for_each_entry_rcu(p, &br->port_list, list) {
> +		have_ip4_mc_rtr = br_ip4_rports_get_timer(p, &ip4_timer);
> +		have_ip6_mc_rtr = br_ip6_rports_get_timer(p, &ip6_timer);
> +
> +		if (!have_ip4_mc_rtr && !have_ip6_mc_rtr)
>  			continue;
> +
>  		port_nest = nla_nest_start_noflag(skb, MDBA_ROUTER_PORT);
>  		if (!port_nest)
>  			goto fail;
> +
>  		if (nla_put_nohdr(skb, sizeof(u32), &p->dev->ifindex) ||
>  		    nla_put_u32(skb, MDBA_ROUTER_PATTR_TIMER,
> -				br_timer_value(&p->ip4_mc_router_timer)) ||
> +				max(ip4_timer, ip6_timer)) ||
>  		    nla_put_u8(skb, MDBA_ROUTER_PATTR_TYPE,
>  			       p->multicast_router)) {
>  			nla_nest_cancel(skb, port_nest);
>