netdev - Re: [PATCH net-next 4/6] enetc: Add interrupt coalescing support

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Date:   Mon, 13 Jul 2020 15:18:55 -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 4/6] enetc: Add interrupt coalescing support

On Mon, 13 Jul 2020 15:56:08 +0300 Claudiu Manoil wrote:
> +static int enetc_get_coalesce(struct net_device *ndev,
> +			      struct ethtool_coalesce *ic)
> +{
> +	struct enetc_ndev_priv *priv = netdev_priv(ndev);
> +	struct enetc_int_vector *v = priv->int_vector[0];
> +
> +	memset(ic, 0, sizeof(*ic));

nit: no need to zero this out

> +	ic->tx_coalesce_usecs = enetc_cycles_to_usecs(v->tx_ictt);
> +	ic->rx_coalesce_usecs = enetc_cycles_to_usecs(v->rx_ictt);
> +
> +	ic->tx_max_coalesced_frames = ENETC_TXIC_PKTTHR;
> +	ic->rx_max_coalesced_frames = ENETC_RXIC_PKTTHR;
> +
> +	return 0;
> +}
> +
> +static int enetc_set_coalesce(struct net_device *ndev,
> +			      struct ethtool_coalesce *ic)
> +{
> +	struct enetc_ndev_priv *priv = netdev_priv(ndev);
> +	u32 rx_ictt, tx_ictt;
> +	int i, ic_mode;
> +
> +	tx_ictt = enetc_usecs_to_cycles(ic->tx_coalesce_usecs);
> +	rx_ictt = enetc_usecs_to_cycles(ic->rx_coalesce_usecs);
> +
> +	if (!ic->rx_max_coalesced_frames)

Isn't it better to check != ENETC_RXIC_PKTTHR, rather than != 0?

> +		netif_warn(priv, hw, ndev, "rx-frames fixed to %d\n",
> +			   ENETC_RXIC_PKTTHR);
> +
> +	if (!ic->tx_max_coalesced_frames)
> +		netif_warn(priv, hw, ndev, "tx-frames fixed to %d\n",
> +			   ENETC_TXIC_PKTTHR);