linux-kernel - Re: [PATCH iproute2-next] devlink: add support for HARD

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Date:   Thu, 21 Jan 2021 14:25:34 +0200
From:   Ido Schimmel <idosch@...sch.org>
To:     Oleksandr Mazur <oleksandr.mazur@...ision.eu>
Cc:     netdev@...r.kernel.org, jiri@...dia.com, davem@...emloft.net,
        linux-kernel@...r.kernel.org, kuba@...nel.org
Subject: Re: [PATCH iproute2-next] devlink: add support for HARD_DROP trap
 action

On Thu, Jan 21, 2021 at 01:29:54PM +0200, Oleksandr Mazur wrote:
> Add support for new HARD_DROP action, which is used for
> trap hard drop statistics retrival. It's used whenever
> device is unable to report trapped packet to the devlink
> subsystem, and thus device could only state how many
> packets have been dropped, without passing a packet
> to the devlink subsystem to get track of traffic statistics.

This patch should also be marked as "RFC".

> 
> Signed-off-by: Oleksandr Mazur <oleksandr.mazur@...ision.eu>
> ---
>  devlink/devlink.c            | 4 ++++
>  include/uapi/linux/devlink.h | 4 ++++

Missing man page and bash completion extensions:

man/man8/devlink-trap.8
bash-completion/devlink

>  2 files changed, 8 insertions(+)
> 
> diff --git a/devlink/devlink.c b/devlink/devlink.c
> index a2e06644..77185f7c 100644
> --- a/devlink/devlink.c
> +++ b/devlink/devlink.c
> @@ -1335,6 +1335,8 @@ static int trap_action_get(const char *actionstr,
>  {
>  	if (strcmp(actionstr, "drop") == 0) {
>  		*p_action = DEVLINK_TRAP_ACTION_DROP;
> +	} else if (strcmp(actionstr, "hard_drop") == 0) {
> +		*p_action = DEVLINK_TRAP_ACTION_HARD_DROP;
>  	} else if (strcmp(actionstr, "trap") == 0) {
>  		*p_action = DEVLINK_TRAP_ACTION_TRAP;
>  	} else if (strcmp(actionstr, "mirror") == 0) {
> @@ -7726,6 +7728,8 @@ static const char *trap_action_name(uint8_t action)
>  	switch (action) {
>  	case DEVLINK_TRAP_ACTION_DROP:
>  		return "drop";
> +	case DEVLINK_TRAP_ACTION_HARD_DROP:
> +		return "hard_drop";
>  	case DEVLINK_TRAP_ACTION_TRAP:
>  		return "trap";
>  	case DEVLINK_TRAP_ACTION_MIRROR:
> diff --git a/include/uapi/linux/devlink.h b/include/uapi/linux/devlink.h
> index 1414acee..ecee2541 100644
> --- a/include/uapi/linux/devlink.h
> +++ b/include/uapi/linux/devlink.h
> @@ -261,12 +261,16 @@ enum {
>   * enum devlink_trap_action - Packet trap action.
>   * @DEVLINK_TRAP_ACTION_DROP: Packet is dropped by the device and a copy is not
>   *                            sent to the CPU.
> + * @DEVLINK_TRAP_ACTION_HARD_DROP: Packet was dropped by the underlying device,
> + *                                 and device cannot report packet to devlink
> + *                                 (or inject it into the kernel RX path).
>   * @DEVLINK_TRAP_ACTION_TRAP: The sole copy of the packet is sent to the CPU.
>   * @DEVLINK_TRAP_ACTION_MIRROR: Packet is forwarded by the device and a copy is
>   *                              sent to the CPU.
>   */
>  enum devlink_trap_action {
>  	DEVLINK_TRAP_ACTION_DROP,
> +	DEVLINK_TRAP_ACTION_HARD_DROP,
>  	DEVLINK_TRAP_ACTION_TRAP,
>  	DEVLINK_TRAP_ACTION_MIRROR,
>  };
> -- 
> 2.17.1
>