netdev - Re: [patch net-next 2/4] net/sched: Introduce sample tc action

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Date:   Sun, 22 Jan 2017 09:29:50 -0500
From:   Roman Mashak <mrv@...atatu.com>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, yotamg@...lanox.com,
        idosch@...lanox.com, eladr@...lanox.com, nogahf@...lanox.com,
        ogerlitz@...lanox.com, jhs@...atatu.com, geert+renesas@...der.be,
        stephen@...workplumber.org, xiyou.wangcong@...il.com,
        linux@...ck-us.net, roopa@...ulusnetworks.com,
        john.fastabend@...il.com, simon.horman@...ronome.com
Subject: Re: [patch net-next 2/4] net/sched: Introduce sample tc action

Jiri Pirko <jiri@...nulli.us> writes:

> From: Yotam Gigi <yotamg@...lanox.com>
>
> This action allows the user to sample traffic matched by tc classifier.
> The sampling consists of choosing packets randomly and sampling them using
> the psample module. The user can configure the psample group number, the
> sampling rate and the packet's truncation (to save kernel-user traffic).
>

[skip]
> diff --git a/include/uapi/linux/tc_act/tc_sample.h b/include/uapi/linux/tc_act/tc_sample.h
> new file mode 100644
> index 0000000..21378bc
> --- /dev/null
> +++ b/include/uapi/linux/tc_act/tc_sample.h
> @@ -0,0 +1,26 @@
> +#ifndef __LINUX_TC_SAMPLE_H
> +#define __LINUX_TC_SAMPLE_H
> +
> +#include <linux/types.h>
> +#include <linux/pkt_cls.h>
> +#include <linux/if_ether.h>
> +
> +#define TCA_ACT_SAMPLE 26
> +
> +struct tc_sample {
> +	tc_gen;
> +};
> +
> +enum {
> +	TCA_SAMPLE_UNSPEC,
> +	TCA_SAMPLE_PARMS,
> +	TCA_SAMPLE_TM,
> +	TCA_SAMPLE_RATE,
> +	TCA_SAMPLE_TRUNC_SIZE,
> +	TCA_SAMPLE_PSAMPLE_GROUP,
> +	TCA_SAMPLE_PAD,
> +	__TCA_SAMPLE_MAX
> +};

Most of action implementations define TCA_X_TM attribute as 1,
and TCA_X_PARMS as 2 followed by action specific tlvs, it is better to
adhere this style in newly designed actions.

[skip]

-- 
Roman Mashak