netdev - Re: [PATCH net-next v2 5/9] net: openvswitch: add emit

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Date: Wed, 5 Jun 2024 20:51:17 +0100
From: Simon Horman <horms@...nel.org>
To: Adrian Moreno <amorenoz@...hat.com>
Cc: netdev@...r.kernel.org, aconole@...hat.com, echaudro@...hat.com,
	i.maximets@....org, dev@...nvswitch.org,
	Donald Hunter <donald.hunter@...il.com>,
	Jakub Kicinski <kuba@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
	Pravin B Shelar <pshelar@....org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2 5/9] net: openvswitch: add emit_sample action

On Mon, Jun 03, 2024 at 08:56:39PM +0200, Adrian Moreno wrote:
> Add support for a new action: emit_sample.
> 
> This action accepts a u32 group id and a variable-length cookie and uses
> the psample multicast group to make the packet available for
> observability.
> 
> The maximum length of the user-defined cookie is set to 16, same as
> tc_cookie, to discourage using cookies that will not be offloadable.
> 
> Signed-off-by: Adrian Moreno <amorenoz@...hat.com>

Hi Adrian,

Some minor nits from my side.

...

> diff --git a/include/uapi/linux/openvswitch.h b/include/uapi/linux/openvswitch.h
> index efc82c318fa2..a0e9dde0584a 100644
> --- a/include/uapi/linux/openvswitch.h
> +++ b/include/uapi/linux/openvswitch.h
> @@ -914,6 +914,30 @@ struct check_pkt_len_arg {
>  };
>  #endif
>  
> +#define OVS_EMIT_SAMPLE_COOKIE_MAX_SIZE 16
> +/**
> + * enum ovs_emit_sample_attr - Attributes for %OVS_ACTION_ATTR_EMIT_SAMPLE
> + * action.
> + *
> + * @OVS_EMIT_SAMPLE_ATTR_GROUP: 32-bit number to identify the source of the
> + * sample.
> + * @OVS_EMIT_SAMPLE_ATTR_COOKIE: A variable-length binary cookie that contains
> + * user-defined metadata. The maximum length is 16 bytes.
> + *
> + * Sends the packet to the psample multicast group with the specified group and
> + * cookie. It is possible to combine this action with the
> + * %OVS_ACTION_ATTR_TRUNC action to limit the size of the packet being emitted.
> + */
> +enum ovs_emit_sample_attr {
> +	OVS_EMIT_SAMPLE_ATTR_UNPSEC,
> +	OVS_EMIT_SAMPLE_ATTR_GROUP,	/* u32 number. */
> +	OVS_EMIT_SAMPLE_ATTR_COOKIE,	/* Optional, user specified cookie. */
> +	__OVS_EMIT_SAMPLE_ATTR_MAX
> +};
> +
> +#define OVS_EMIT_SAMPLE_ATTR_MAX (__OVS_EMIT_SAMPLE_ATTR_MAX - 1)
> +
> +

nit: One blank line is enough.

     Flagged by checkpatch.pl

>  /**
>   * enum ovs_action_attr - Action types.
>   *
> @@ -1004,6 +1028,7 @@ enum ovs_action_attr {
>  	OVS_ACTION_ATTR_ADD_MPLS,     /* struct ovs_action_add_mpls. */
>  	OVS_ACTION_ATTR_DEC_TTL,      /* Nested OVS_DEC_TTL_ATTR_*. */
>  	OVS_ACTION_ATTR_DROP,         /* u32 error code. */
> +	OVS_ACTION_ATTR_EMIT_SAMPLE,  /* Nested OVS_EMIT_SAMPLE_ATTR_*. */

nit: Please add OVS_ACTION_ATTR_EMIT_SAMPLE to the Kenrel doc
     for this structure.

>  
>  	__OVS_ACTION_ATTR_MAX,	      /* Nothing past this will be accepted
>  				       * from userspace. */

...