linux-kernel - Re: [PATCH RFC net-next 0/5] net: vlan: fix bridge binding behavior and add selftests

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Date:   Tue, 20 Sep 2022 16:29:54 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Nikolay Aleksandrov <razor@...ckwall.org>
Cc:     Sevinj Aghayeva <sevinj.aghayeva@...il.com>,
        netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        aroulin@...dia.com, sbrivio@...hat.com, roopa@...dia.com,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, linux-kernel@...r.kernel.org,
        bridge@...ts.linux-foundation.org
Subject: Re: [PATCH RFC net-next 0/5] net: vlan: fix bridge binding behavior
 and add selftests

On Tue, 20 Sep 2022 12:16:26 +0300 Nikolay Aleksandrov wrote:
> The set looks good to me, the bridge and vlan direct dependency is gone and
> the new notification type is used for passing link type specific info.

IDK, vlan knows it's calling the bridge:

+	if ((vlan->flags ^ old_flags) & VLAN_FLAG_BRIDGE_BINDING &&
+	    netif_is_bridge_master(vlan->real_dev)) {

bridge knows it's vlan calling:

+	if (is_vlan_dev(dev)) {
+		br_vlan_device_event(dev, event, ptr);

going thru the generic NETDEV notifier seems odd.

If this is just to avoid the dependency we can perhaps add a stub 
like net/ipv4/udp_tunnel_stub.c ?

> If the others are ok with it I think you can send it as non-RFC, but I'd give it
> a few more days at least. :)