linux-kernel - Re: [PATCH net-next v6 05/10] net: openvswitch: add psample action

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Date: Fri, 28 Jun 2024 20:45:51 +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 v6 05/10] net: openvswitch: add psample action

On Fri, Jun 28, 2024 at 01:05:41PM +0200, Adrian Moreno wrote:
> Add support for a new action: psample.
> 
> 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>

...

> diff --git a/include/uapi/linux/openvswitch.h b/include/uapi/linux/openvswitch.h
> index efc82c318fa2..07086759556b 100644
> --- a/include/uapi/linux/openvswitch.h
> +++ b/include/uapi/linux/openvswitch.h
> @@ -914,6 +914,31 @@ struct check_pkt_len_arg {
>  };
>  #endif
>  
> +#define OVS_PSAMPLE_COOKIE_MAX_SIZE 16
> +/**
> + * enum ovs_pample_attr - Attributes for %OVS_ACTION_ATTR_PSAMPLE

nit: s/ovs_pample_attr/ovs_psample_attr/

> + * action.
> + *
> + * @OVS_PSAMPLE_ATTR_GROUP: 32-bit number to identify the source of the
> + * sample.
> + * @OVS_PSAMPLE_ATTR_COOKIE: An optional variable-length binary cookie that
> + * contains user-defined metadata. The maximum length is
> + * OVS_PSAMPLE_COOKIE_MAX_SIZE 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 sample.
> + */
> +enum ovs_psample_attr {
> +	OVS_PSAMPLE_ATTR_GROUP = 1,	/* u32 number. */
> +	OVS_PSAMPLE_ATTR_COOKIE,	/* Optional, user specified cookie. */
> +
> +	/* private: */
> +	__OVS_PSAMPLE_ATTR_MAX
> +};

...