linux-kernel - Re: [RFC v3 net-next] net: core: devlink: add 'dropped' stats field for DROP trap action

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Date:   Tue, 26 Jan 2021 10:10:06 +0000
From:   Oleksandr Mazur <oleksandr.mazur@...ision.eu>
To:     Jakub Kicinski <kuba@...nel.org>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "jiri@...dia.com" <jiri@...dia.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC v3 net-next] net: core: devlink: add 'dropped' stats field
 for DROP trap action

On Mon, 25 Jan 2021 14:38:56 +0200 Oleksandr Mazur wrote:
> +     if (trap_item->action == DEVLINK_TRAP_ACTION_DROP &&
> +         devlink->ops->trap_drop_counter_get) {
> +             err = devlink->ops->trap_drop_counter_get(devlink,
> +                                                       trap_item->trap,
> +                                                       &drops);
> +             if (err)
> +                     return err;
> +     }

> Why only report this counter when action is set to drop?

> Thinking about it again - if the action can be changed wouldn't it 
> be best for the user to actually get a "HW condition hit" counter,
> which would increment regardless of SW config (incl. policers)?

> Otherwise if admin logs onto the box and temporarily enables a trap 
> for debug this count would disappear.

Okay, so should it become like generic HW counter - trap_hw_counter_get?