netdev - Re: [PATCH v3 net-next 03/11] net: switchdev: remove the transaction structure from port object notifiers

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Date:   Thu, 7 Jan 2021 12:17:12 +0100
From:   Petr Machata <petrm@...dia.com>
To:     Ido Schimmel <idosch@...sch.org>
CC:     Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, <netdev@...r.kernel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        "Andrew Lunn" <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        "Kurt Kanzenbach" <kurt@...utronix.de>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        "Woojung Huh" <woojung.huh@...rochip.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        Sean Wang <sean.wang@...iatek.com>,
        "Landen Chao" <Landen.Chao@...iatek.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Vadym Kochan <vkochan@...vell.com>,
        "Taras Chornyi" <tchornyi@...vell.com>,
        Jiri Pirko <jiri@...dia.com>, Ido Schimmel <idosch@...dia.com>,
        Grygorii Strashko <grygorii.strashko@...com>,
        "Ioana Ciornei" <ioana.ciornei@....com>,
        Ivan Vecera <ivecera@...hat.com>
Subject: Re: [PATCH v3 net-next 03/11] net: switchdev: remove the
 transaction structure from port object notifiers


Ido Schimmel <idosch@...sch.org> writes:

> +Petr
>
> On Thu, Jan 07, 2021 at 01:17:20AM +0200, Vladimir Oltean wrote:
>>  static int mlxsw_sp_port_obj_add(struct net_device *dev,
>>  				 const struct switchdev_obj *obj,
>> -				 struct switchdev_trans *trans,
>>  				 struct netlink_ext_ack *extack)
>>  {
>>  	struct mlxsw_sp_port *mlxsw_sp_port = netdev_priv(dev);
>>  	const struct switchdev_obj_port_vlan *vlan;
>> +	struct switchdev_trans trans;
>>  	int err = 0;
>>  
>>  	switch (obj->id) {
>>  	case SWITCHDEV_OBJ_ID_PORT_VLAN:
>>  		vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
>> -		err = mlxsw_sp_port_vlans_add(mlxsw_sp_port, vlan, trans,
>> +
>
> Got the regression results. The call to mlxsw_sp_span_respin() should be
> placed here because it needs to be triggered regardless of the return
> value of mlxsw_sp_port_vlans_add().

Agreed, the new code differs in that respin is not called on error path.