netdev - Re: [PATCH net-next v2 5/6] enetc: Add interrupt coalescing support

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Message-ID: <20200717123239.1ffb5966@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Fri, 17 Jul 2020 12:32:39 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Claudiu Manoil <claudiu.manoil@....com>
Cc:     "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v2 5/6] enetc: Add interrupt coalescing support

On Fri, 17 Jul 2020 18:37:03 +0300 Claudiu Manoil wrote:
> +	if (ic->rx_max_coalesced_frames != ENETC_RXIC_PKTTHR)
> +		netif_warn(priv, hw, ndev, "rx-frames fixed to %d\n",
> +			   ENETC_RXIC_PKTTHR);
> +
> +	if (ic->tx_max_coalesced_frames != ENETC_TXIC_PKTTHR)
> +		netif_warn(priv, hw, ndev, "tx-frames fixed to %d\n",
> +			   ENETC_TXIC_PKTTHR);

On second thought - why not return an error here? Since only one value
is supported seems like the right way to communicate to the users that
they can't change this.

> +	if (netif_running(ndev) && changed) {
> +		/* reconfigure the operation mode of h/w interrupts,
> +		 * traffic needs to be paused in the process
> +		 */
> +		enetc_stop(ndev);
> +		enetc_start(ndev);

Is start going to print an error when it fails? Kinda scary if this
could turn into a silent failure.