Re: [PATCH] dpaa_eth: add ethtool coalesce control

[David Miller]

From: Madalin Bucur <madalin.bucur@xxxxxxx>
Date: Wed,  7 Nov 2018 15:53:43 +0200

> +static int dpaa_set_coalesce(struct net_device *dev,
> +			     struct ethtool_coalesce *c)
> +{
> +	const cpumask_t *cpus = qman_affine_cpus();
> +	struct qman_portal *portal;
> +	u32 period;
> +	u8 thresh;
> +	int cpu;
> +
> +	period = c->rx_coalesce_usecs;
> +	thresh = c->rx_max_coalesced_frames;
> +
> +	for_each_cpu(cpu, cpus) {
> +		portal = qman_get_affine_portal(cpu);
> +		qman_portal_set_iperiod(portal, period);
> +		qman_dqrr_set_ithresh(portal, thresh);
> +	}

You really have to check to see if the user is trying to configure
a setting you don't support, for example if the user tries
to set ->use_adative_rx_coalesce or uses a period or threshold
value which is out of range.

Thanks.