netdev - Re: [PATCH net-next v2 2/4] devlink: add .trap_group_action

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Date:   Wed, 30 Sep 2020 22:53:31 +0300
From:   Ido Schimmel <idosch@...sch.org>
To:     Ioana Ciornei <ioana.ciornei@....com>
Cc:     davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
        jiri@...dia.com, idosch@...dia.com
Subject: Re: [PATCH net-next v2 2/4] devlink: add .trap_group_action_set()
 callback

On Wed, Sep 30, 2020 at 10:16:43PM +0300, Ioana Ciornei wrote:
> Add a new devlink callback, .trap_group_action_set(), which can be used
> by device drivers which do not support controlling the action (drop,
> trap) on each trap but rather on the entire group trap.
> If this new callback is populated, it will take precedence over the
> .trap_action_set() callback when the user requests a change of all the
> traps in a group.
> 
> Signed-off-by: Ioana Ciornei <ioana.ciornei@....com>

Did you test this change with

tools/testing/selftests/drivers/net/netdevsim/devlink_trap.sh

?

Just to make sure you didn't add a regression

> ---
> Changes in v2:
>  - none
> 
>  include/net/devlink.h | 10 ++++++++++
>  net/core/devlink.c    | 18 ++++++++++++++++++
>  2 files changed, 28 insertions(+)
> 
> diff --git a/include/net/devlink.h b/include/net/devlink.h
> index 20db4a070fc8..307937efa83a 100644
> --- a/include/net/devlink.h
> +++ b/include/net/devlink.h
> @@ -1226,6 +1226,16 @@ struct devlink_ops {
>  			      const struct devlink_trap_group *group,
>  			      const struct devlink_trap_policer *policer,
>  			      struct netlink_ext_ack *extack);
> +	/**
> +	 * @trap_group_action_set: Group action set function.

To be consistent with other operations:

Trap group action set function.

> +	 *
> +	 * If this callback is populated, it will take precedence over looping
> +	 * over all traps in a group and calling .trap_action_set().
> +	 */
> +	int (*trap_group_action_set)(struct devlink *devlink,
> +				     const struct devlink_trap_group *group,
> +				     enum devlink_trap_action action,
> +				     struct netlink_ext_ack *extack);
>  	/**
>  	 * @trap_policer_init: Trap policer initialization function.
>  	 *
> diff --git a/net/core/devlink.c b/net/core/devlink.c
> index 10fea5854bc2..18136ad413e6 100644
> --- a/net/core/devlink.c
> +++ b/net/core/devlink.c
> @@ -6720,6 +6720,24 @@ __devlink_trap_group_action_set(struct devlink *devlink,
>  	struct devlink_trap_item *trap_item;
>  	int err;
>  
> +	if (devlink->ops->trap_group_action_set) {
> +		err = devlink->ops->trap_group_action_set(devlink, group_item->group,
> +							  trap_action, extack);
> +		if (err)
> +			return err;
> +
> +		list_for_each_entry(trap_item, &devlink->trap_list, list) {
> +			if (strcmp(trap_item->group_item->group->name, group_name))
> +				continue;
> +			if (trap_item->action != trap_action &&
> +			    trap_item->trap->type != DEVLINK_TRAP_TYPE_DROP)
> +				continue;
> +			trap_item->action = trap_action;
> +		}
> +
> +		return 0;
> +	}
> +
>  	list_for_each_entry(trap_item, &devlink->trap_list, list) {
>  		if (strcmp(trap_item->group_item->group->name, group_name))
>  			continue;
> -- 
> 2.28.0
>