netdev - Re: [PATCH v2 RFC net-next 13/18] net: mvpp2: add ethtool flow control configuration support

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Message-ID: <20210124123554.GW1551@shell.armlinux.org.uk>
Date:   Sun, 24 Jan 2021 12:35:54 +0000
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     stefanc@...vell.com
Cc:     netdev@...r.kernel.org, thomas.petazzoni@...tlin.com,
        davem@...emloft.net, nadavh@...vell.com, ymarkman@...vell.com,
        linux-kernel@...r.kernel.org, kuba@...nel.org, mw@...ihalf.com,
        andrew@...n.ch, atenart@...nel.org
Subject: Re: [PATCH v2 RFC net-next 13/18] net: mvpp2: add ethtool flow
 control configuration support

On Sun, Jan 24, 2021 at 01:44:02PM +0200, stefanc@...vell.com wrote:
> @@ -6407,6 +6490,29 @@ static void mvpp2_mac_link_up(struct phylink_config *config,
>  			     val);
>  	}
>  
> +	if (tx_pause && port->priv->global_tx_fc) {
> +		port->tx_fc = true;
> +		mvpp2_rxq_enable_fc(port);
> +		if (port->priv->percpu_pools) {
> +			for (i = 0; i < port->nrxqs; i++)
> +				mvpp2_bm_pool_update_fc(port, &port->priv->bm_pools[i], true);
> +		} else {
> +			mvpp2_bm_pool_update_fc(port, port->pool_long, true);
> +			mvpp2_bm_pool_update_fc(port, port->pool_short, true);
> +		}
> +
> +	} else if (port->priv->global_tx_fc) {
> +		port->tx_fc = false;
> +		mvpp2_rxq_disable_fc(port);
> +		if (port->priv->percpu_pools) {
> +			for (i = 0; i < port->nrxqs; i++)
> +				mvpp2_bm_pool_update_fc(port, &port->priv->bm_pools[i], false);
> +		} else {
> +			mvpp2_bm_pool_update_fc(port, port->pool_long, false);
> +			mvpp2_bm_pool_update_fc(port, port->pool_short, false);
> +		}
> +	}
> +

It seems this can be written more succinctly:

	if (port->priv->global_tx_fc) {
		port->tx_fc = tx_pause;
		if (tx_pause)
			mvpp2_rxq_enable_fc(port);
		else
			mvpp2_rxq_disable_fc(port);
		if (port->priv->percpu_pools) {
			for (i = 0; i < port->nrxqs; i++)
				mvpp2_bm_pool_update_fc(port,
						&port->priv->bm_pools[i],
						tx_pause);
		} else {
			mvpp2_bm_pool_update_fc(port, port->pool_long,
						tx_pause);
			mvpp2_bm_pool_update_fc(port, port->pool_short,
						tx_pause);
		}
	}

-- 
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