Re: [PATCH net-next v4 1/6] net: dcb: add new pcp selector to app object

From: Petr Machata <petrm@nvidia.com>
To: Daniel Machon <daniel.machon@microchip.com>
Cc: <netdev@vger.kernel.org>, <davem@davemloft.net>,
	<petrm@nvidia.com>, <maxime.chevallier@bootlin.com>,
	<thomas.petazzoni@bootlin.com>, <edumazet@google.com>,
	<kuba@kernel.org>, <pabeni@redhat.com>,
	<lars.povlsen@microchip.com>, <Steen.Hegelund@microchip.com>,
	<UNGLinuxDriver@microchip.com>, <joe@perches.com>,
	<linux@armlinux.org.uk>, <horatiu.vultur@microchip.com>,
	<Julia.Lawall@inria.fr>, <vladimir.oltean@nxp.com>,
	<linux-kernel@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH net-next v4 1/6] net: dcb: add new pcp selector to app object
Date: Mon, 31 Oct 2022 12:13:43 +0100	[thread overview]
Message-ID: <87o7tsw7ji.fsf@nvidia.com> (raw)
In-Reply-To: <20221028100320.786984-2-daniel.machon@microchip.com>

Daniel Machon <daniel.machon@microchip.com> writes:

> diff --git a/net/dcb/dcbnl.c b/net/dcb/dcbnl.c
> index dc4fb699b56c..68e033a459af 100644
> --- a/net/dcb/dcbnl.c
> +++ b/net/dcb/dcbnl.c
> @@ -179,6 +179,57 @@ static const struct nla_policy dcbnl_featcfg_nest[DCB_FEATCFG_ATTR_MAX + 1] = {
>  static LIST_HEAD(dcb_app_list);
>  static DEFINE_SPINLOCK(dcb_lock);
>  
> +static enum ieee_attrs_app dcbnl_app_attr_type_get(u8 selector)
> +{
> +	switch (selector) {
> +	case IEEE_8021QAZ_APP_SEL_ETHERTYPE:
> +	case IEEE_8021QAZ_APP_SEL_STREAM:
> +	case IEEE_8021QAZ_APP_SEL_DGRAM:
> +	case IEEE_8021QAZ_APP_SEL_ANY:
> +	case IEEE_8021QAZ_APP_SEL_DSCP:
> +		return DCB_ATTR_IEEE_APP;
> +	case DCB_APP_SEL_PCP:
> +		return DCB_ATTR_DCB_APP;
> +	default:
> +		return DCB_ATTR_IEEE_APP_UNSPEC;
> +	}
> +}
> +
> +static bool dcbnl_app_attr_type_validate(enum ieee_attrs_app type)
> +{
> +	switch (type) {
> +	case DCB_ATTR_IEEE_APP:
> +	case DCB_ATTR_DCB_APP:
> +		return true;
> +	default:
> +		return false;
> +	}
> +}
> +
> +static bool dcbnl_app_selector_validate(enum ieee_attrs_app type, u32 selector)
> +{
> +	switch (selector) {
> +	case IEEE_8021QAZ_APP_SEL_ETHERTYPE:
> +	case IEEE_8021QAZ_APP_SEL_STREAM:
> +	case IEEE_8021QAZ_APP_SEL_DGRAM:
> +	case IEEE_8021QAZ_APP_SEL_ANY:
> +	case IEEE_8021QAZ_APP_SEL_DSCP:
> +		/* IEEE std selectors in IEEE std attribute */
> +		if (type == DCB_ATTR_IEEE_APP)
> +			return true;
> +		else
> +			return false;

AKA return type == DCB_ATTR_IEEE_APP;

> +	case DCB_APP_SEL_PCP:
> +		/* Non-std selectors in non-std attribute */
> +		if (type == DCB_ATTR_DCB_APP)
> +			return true;
> +		else
> +			return false;

Likewise here.

> +	default:
> +		return false;
> +	}

Also, it really looks like the following would be equivalent?

static bool dcbnl_app_selector_validate(enum ieee_attrs_app type, u32 selector)
{
	return dcbnl_app_attr_type_get(selector) == type;
}

Also, shouldn't it be u8 selector?

> +}
> +
>  static struct sk_buff *dcbnl_newmsg(int type, u8 cmd, u32 port, u32 seq,
>  				    u32 flags, struct nlmsghdr **nlhp)
>  {

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