Re: [PATCH v5 net-next 05/10] net: switchdev: pass flags and mask to both {PRE_,}BRIDGE_FLAGS attributes

[Florian Fainelli]

On 2/12/2021 7:15 AM, Vladimir Oltean wrote:
> From: Vladimir Oltean <vladimir.oltean@xxxxxxx>
> 
> This switchdev attribute offers a counterproductive API for a driver
> writer, because although br_switchdev_set_port_flag gets passed a
> "flags" and a "mask", those are passed piecemeal to the driver, so while
> the PRE_BRIDGE_FLAGS listener knows what changed because it has the
> "mask", the BRIDGE_FLAGS listener doesn't, because it only has the final
> value. But certain drivers can offload only certain combinations of
> settings, like for example they cannot change unicast flooding
> independently of multicast flooding - they must be both on or both off.
> The way the information is passed to switchdev makes drivers not
> expressive enough, and unable to reject this request ahead of time, in
> the PRE_BRIDGE_FLAGS notifier, so they are forced to reject it during
> the deferred BRIDGE_FLAGS attribute, where the rejection is currently
> ignored.
> 
> This patch also changes drivers to make use of the "mask" field for edge
> detection when possible.
> 
> Signed-off-by: Vladimir Oltean <vladimir.oltean@xxxxxxx>

Reviewed-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
-- 
Florian