netdev - Re: [PATCH net-next v3 2/3] net: flower: add support for matching cfm fields

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Date:   Wed, 19 Apr 2023 18:20:57 +0300
From:   Ido Schimmel <idosch@...sch.org>
To:     Zahari Doychev <zahari.doychev@...ux.com>
Cc:     netdev@...r.kernel.org, jhs@...atatu.com, xiyou.wangcong@...il.com,
        jiri@...nulli.us, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, hmehrtens@...linear.com,
        aleksander.lobakin@...el.com, simon.horman@...igine.com,
        Zahari Doychev <zdoychev@...linear.com>
Subject: Re: [PATCH net-next v3 2/3] net: flower: add support for matching
 cfm fields

On Mon, Apr 17, 2023 at 11:32:32PM +0200, Zahari Doychev wrote:
> +static const struct nla_policy cfm_opt_policy[TCA_FLOWER_KEY_CFM_OPT_MAX] = {
> +	[TCA_FLOWER_KEY_CFM_MD_LEVEL]		= { .type = NLA_U8 },
> +	[TCA_FLOWER_KEY_CFM_OPCODE]		= { .type = NLA_U8 },
> +};

[...]

> +static int fl_set_key_cfm_md_level(struct nlattr **tb,
> +				   struct fl_flow_key *key,
> +				   struct fl_flow_key *mask,
> +				   struct netlink_ext_ack *extack)
> +{
> +	u8 level;
> +
> +	if (!tb[TCA_FLOWER_KEY_CFM_MD_LEVEL])
> +		return 0;
> +
> +	level = nla_get_u8(tb[TCA_FLOWER_KEY_CFM_MD_LEVEL]);
> +	if (level & ~FIELD_MAX(FLOW_DIS_CFM_MDL_MASK)) {
> +		NL_SET_ERR_MSG_ATTR(extack, tb[TCA_FLOWER_KEY_CFM_MD_LEVEL],
> +				    "cfm md level must be in [0, 7]");
> +		return -EINVAL;
> +	}

You should be able to replace this with NLA_POLICY_MAX()

> +
> +	key->cfm.mdl_ver = FIELD_PREP(FLOW_DIS_CFM_MDL_MASK, level);
> +	mask->cfm.mdl_ver = FLOW_DIS_CFM_MDL_MASK;
> +
> +	return 0;
> +}