netdev - Re: [PATCH v3 net-next 05/11] net: bridge: switchdev: differentiate new VLANs from changed ones

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Date:   Wed, 16 Feb 2022 13:27:34 +0200
From:   Nikolay Aleksandrov <nikolay@...dia.com>
To:     Vladimir Oltean <vladimir.oltean@....com>, <netdev@...r.kernel.org>
CC:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        "Vivien Didelot" <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Roopa Prabhu <roopa@...dia.com>, Jiri Pirko <jiri@...dia.com>,
        Ido Schimmel <idosch@...dia.com>,
        Rafael Richter <rafael.richter@....de>,
        Daniel Klauer <daniel.klauer@....de>,
        Tobias Waldekranz <tobias@...dekranz.com>
Subject: Re: [PATCH v3 net-next 05/11] net: bridge: switchdev: differentiate
 new VLANs from changed ones

On 15/02/2022 19:02, Vladimir Oltean wrote:
> br_switchdev_port_vlan_add() currently emits a SWITCHDEV_PORT_OBJ_ADD
> event with a SWITCHDEV_OBJ_ID_PORT_VLAN for 2 distinct cases:
> 
> - a struct net_bridge_vlan got created
> - an existing struct net_bridge_vlan was modified
> 
> This makes it impossible for switchdev drivers to properly balance
> PORT_OBJ_ADD with PORT_OBJ_DEL events, so if we want to allow that to
> happen, we must provide a way for drivers to distinguish between a
> VLAN with changed flags and a new one.
> 
> Annotate struct switchdev_obj_port_vlan with a "bool changed" that
> distinguishes the 2 cases above.
> 
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
> ---
> v2->v3:
> - drop "old_flags" from struct switchdev_obj_port_vlan, nobody needs it
>   now, in v2 only DSA needed it to filter out BRENTRY transitions, that
>   is now solved cleaner.
> v1->v2:
> - patch is new, logically replaces the need for "net: bridge: vlan:
>   notify a switchdev deletion when modifying flags of existing VLAN"
> 
>  include/net/switchdev.h   |  7 +++++++
>  net/bridge/br_private.h   |  6 +++---
>  net/bridge/br_switchdev.c |  3 ++-
>  net/bridge/br_vlan.c      | 10 +++++-----
>  4 files changed, 17 insertions(+), 9 deletions(-)
> 

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