linux-kernel - Re: [PATCH v2 2/2] can: netlink: add interface for CAN-FD Transmitter Delay Compensation (TDC)

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Message-ID: <20210616094633.fwg6rsyxyvm2zc6d@pengutronix.de>
Date:   Wed, 16 Jun 2021 11:46:33 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Vincent Mailhol <mailhol.vincent@...adoo.fr>
Cc:     linux-can@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Oliver Hartkopp <socketcan@...tkopp.net>
Subject: Re: [PATCH v2 2/2] can: netlink: add interface for CAN-FD
 Transmitter Delay Compensation (TDC)

On 04.06.2021 00:15:50, Vincent Mailhol wrote:
[...]

> +static size_t can_tdc_get_size(const struct net_device *dev)
> +{
> +	struct can_priv *priv = netdev_priv(dev);
> +	size_t size;
> +
> +	if (!priv->tdc_const)
> +		return 0;
> +
> +	size = nla_total_size(0);			/* nest IFLA_CAN_TDC */
> +	size += nla_total_size(sizeof(u32));		/* IFLA_CAN_TDCV_MAX */
> +	size += nla_total_size(sizeof(u32));		/* IFLA_CAN_TDCO_MAX */
> +	size += nla_total_size(sizeof(u32));		/* IFLA_CAN_TDCF_MAX */
> +
> +	if (priv->tdc.tdco) {

Naively I'd say, iff the device has tdc_const give the user space the
tdc parameters, regardless if some value is 0 or not.

What do you think?

Marc
-- 
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