netdev - Re: [PATCH net-next 2/4] bridge: mcast: Remove pointless sequence generation counter assignment

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Message-ID: <ca8740bc-0c72-efd9-670e-617dfd46f0f6@blackwall.org>
Date:   Thu, 9 Feb 2023 09:19:00 +0100
From:   Nikolay Aleksandrov <razor@...ckwall.org>
To:     Ido Schimmel <idosch@...dia.com>, netdev@...r.kernel.org,
        bridge@...ts.linux-foundation.org
Cc:     davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        edumazet@...gle.com, roopa@...dia.com, petrm@...dia.com,
        mlxsw@...dia.com
Subject: Re: [PATCH net-next 2/4] bridge: mcast: Remove pointless sequence
 generation counter assignment

On 2/9/23 09:18, Ido Schimmel wrote:
> The purpose of the sequence generation counter in the netlink callback
> is to identify if a multipart dump is consistent or not by calling
> nl_dump_check_consistent() whenever a message is generated.
> 
> The function is not invoked by the MDB code, rendering the sequence
> generation counter assignment pointless. Remove it.
> 
> Note that even if the function was invoked, we still could not
> accurately determine if the dump is consistent or not, as there is no
> sequence generation counter for MDB entries, unlike nexthop objects, for
> example.
> 
> Signed-off-by: Ido Schimmel <idosch@...dia.com>
> ---
>   net/bridge/br_mdb.c | 2 --
>   1 file changed, 2 deletions(-)
> 
> diff --git a/net/bridge/br_mdb.c b/net/bridge/br_mdb.c
> index 13076206e497..96f36febfb30 100644
> --- a/net/bridge/br_mdb.c
> +++ b/net/bridge/br_mdb.c
> @@ -421,8 +421,6 @@ static int br_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
>   
>   	rcu_read_lock();
>   
> -	cb->seq = net->dev_base_seq;
> -
>   	for_each_netdev_rcu(net, dev) {
>   		if (netif_is_bridge_master(dev)) {
>   			struct net_bridge *br = netdev_priv(dev);


Acked-by: Nikolay Aleksandrov <razor@...ckwall.org>