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Date:   Wed, 2 Sep 2020 11:46:27 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Moshe Shemesh <moshe@...dia.com>
Cc:     Moshe Shemesh <moshe@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jiri Pirko <jiri@...lanox.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next RFC v3 01/14] devlink: Add reload action option
 to devlink reload command 

Tue, Sep 01, 2020 at 09:43:00PM CEST, moshe@...dia.com wrote:
>
>On 8/31/2020 3:15 PM, Jiri Pirko wrote:
>> Sun, Aug 30, 2020 at 05:27:21PM CEST, moshe@...lanox.com wrote:
>> > Add devlink reload action to allow the user to request a specific reload
>> > action. The action parameter is optional, if not specified then devlink
>> > driver re-init action is used (backward compatible).
>> > Note that when required to do firmware activation some drivers may need
>> > to reload the driver. On the other hand some drivers may need to reset
>> > the firmware to reinitialize the driver entities. Therefore, the devlink
>> > reload command returns the actions which were actually done.
>> > However, in case fw_activate_no_reset action is selected, then no other
>> > reload action is allowed.
>> > Reload actions supported are:
>> > driver_reinit: driver entities re-initialization, applying devlink-param
>> >                and devlink-resource values.
>> > fw_activate: firmware activate.
>> > fw_activate_no_reset: Activate new firmware image without any reset.
>> >                       (also known as: firmware live patching).
>> > 
>> > command examples:
>> > $devlink dev reload pci/0000:82:00.0 action driver_reinit
>> > reload_actions_done:
>> >   driver_reinit
>> > 
>> > $devlink dev reload pci/0000:82:00.0 action fw_activate
>> > reload_actions_done:
>> >   driver_reinit fw_activate
>> > 
>> > Signed-off-by: Moshe Shemesh <moshe@...lanox.com>
>> > ---
>> > v2 -> v3:
>> > - Replace fw_live_patch action by fw_activate_no_reset
>> > - Devlink reload returns the actions done over netlink reply
>> > v1 -> v2:
>> > - Instead of reload levels driver,fw_reset,fw_live_patch have reload
>> >   actions driver_reinit,fw_activate,fw_live_patch
>> > - Remove driver default level, the action driver_reinit is the default
>> >   action for all drivers
>> > ---
>> [...]
>> 
>> 
>> > diff --git a/drivers/net/ethernet/mellanox/mlxsw/core.c b/drivers/net/ethernet/mellanox/mlxsw/core.c
>> > index 08d101138fbe..c42b66d88884 100644
>> > --- a/drivers/net/ethernet/mellanox/mlxsw/core.c
>> > +++ b/drivers/net/ethernet/mellanox/mlxsw/core.c
>> > @@ -1113,7 +1113,7 @@ mlxsw_devlink_info_get(struct devlink *devlink, struct devlink_info_req *req,
>> > 
>> > static int
>> > mlxsw_devlink_core_bus_device_reload_down(struct devlink *devlink,
>> > -					  bool netns_change,
>> > +					  bool netns_change, enum devlink_reload_action action,
>> > 					  struct netlink_ext_ack *extack)
>> > {
>> > 	struct mlxsw_core *mlxsw_core = devlink_priv(devlink);
>> > @@ -1126,15 +1126,23 @@ mlxsw_devlink_core_bus_device_reload_down(struct devlink *devlink,
>> > }
>> > 
>> > static int
>> > -mlxsw_devlink_core_bus_device_reload_up(struct devlink *devlink,
>> > -					struct netlink_ext_ack *extack)
>> > +mlxsw_devlink_core_bus_device_reload_up(struct devlink *devlink, enum devlink_reload_action action,
>> > +					struct netlink_ext_ack *extack, unsigned long *actions_done)
>> > {
>> > 	struct mlxsw_core *mlxsw_core = devlink_priv(devlink);
>> > +	int err;
>> > 
>> > -	return mlxsw_core_bus_device_register(mlxsw_core->bus_info,
>> > -					      mlxsw_core->bus,
>> > -					      mlxsw_core->bus_priv, true,
>> > -					      devlink, extack);
>> > +	err = mlxsw_core_bus_device_register(mlxsw_core->bus_info,
>> > +					     mlxsw_core->bus,
>> > +					     mlxsw_core->bus_priv, true,
>> > +					     devlink, extack);
>> > +	if (err)
>> > +		return err;
>> > +	if (actions_done)
>> > +		*actions_done = BIT(DEVLINK_RELOAD_ACTION_DRIVER_REINIT) |
>> > +				BIT(DEVLINK_RELOAD_ACTION_FW_ACTIVATE);
>> > +
>> > +	return 0;
>> > }
>> > 
>> > static int mlxsw_devlink_flash_update(struct devlink *devlink,
>> > @@ -1268,6 +1276,8 @@ mlxsw_devlink_trap_policer_counter_get(struct devlink *devlink,
>> > }
>> > 
>> > static const struct devlink_ops mlxsw_devlink_ops = {
>> > +	.supported_reload_actions	= BIT(DEVLINK_RELOAD_ACTION_DRIVER_REINIT) |
>> > +					  BIT(DEVLINK_RELOAD_ACTION_FW_ACTIVATE),
>> This is confusing and open to interpretation. Does this mean that the
>> driver supports:
>> 1) REINIT && FW_ACTIVATE
>> 2) REINIT || FW_ACTIVATE
>> ?
>> 
>> Because mlxsw supports only 1. I guess that mlx5 supports both. This
>> needs to be distinguished.
>
>Mlxsw supports 1, so it supports fw_activation and performs also reinit and
>vice versa.

My point is, your bitfield does not exactly tell what the driver
supports or not.


>
>Mlx5 supports fw_activate and performs also reinit. However, it supports
>reinit without performing fw_activate.
>
>> I think you need an array of combinations. Or perhaps rather to extend
>> the enum with combinations. You kind of have it already with
>> DEVLINK_RELOAD_ACTION_FW_ACTIVATE_NO_RESET
>> 
>> Maybe we can have something like:
>> DEVLINK_RELOAD_ACTION_DRIVER_REINIT
>> DEVLINK_RELOAD_ACTION_DRIVER_REINIT_FW_ACTIVATE_RESET
>> DEVLINK_RELOAD_ACTION_FW_ACTIVATE_RESET
>> DEVLINK_RELOAD_ACTION_FW_ACTIVATE (this is the original FW_ACTIVATE_NO_RESET)
>
>The FW_ACTIVATE_NO_RESET meant also to emphasize that driver implementation
>for this one should not do any reset.
>
>So maybe we can have
>
>DEVLINK_RELOAD_ACTION_FW_ACTIVATE_RESET
>DEVLINK_RELOAD_ACTION_FW_ACTIVATE_NO_RESET

Okay.


>
>> Each has very clear meaning.
>
>
>Yes, it the driver support here is more clear.
>
>> Also, then the "actions_done" would be a simple enum, directly returned
>> to the user. No bitfield needed.
>
>
>I agree it is more clear on the driver support side, but what about the uAPI

As I said, there would be one enum value returned to the user. Clear and
simple.


>? Do we need such change there too or keep it as is, each action by itself
>and return what was performed ?

Well, I don't know. User asks for X, X should be performed, not Y or Z.
So perhaps the return value is not needed.
Just driver advertizes it supports X, Y, Z and the users says:
1) do X, driver does X
2) do Y, driver does Y
3) do Z, driver does Z
[
I think this kindof circles back to the original proposal...

>
>> 
>> > 	.reload_down		= mlxsw_devlink_core_bus_device_reload_down,
>> > 	.reload_up		= mlxsw_devlink_core_bus_device_reload_up,
>> > 	.port_type_set			= mlxsw_devlink_port_type_set,
>> [...]

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