linux-kernel - Re: [PATCH v2] net: add Faraday FTMAC100 10/100 Ethernet driver

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Message-ID: <1295288462.3335.55.camel@edumazet-laptop>
Date:	Mon, 17 Jan 2011 19:21:02 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Po-Yu Chuang <ratbert.chuang@...il.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	ratbert@...aday-tech.com, bhutchings@...arflare.com,
	joe@...ches.com, dilinger@...ued.net
Subject: Re: [PATCH v2] net: add Faraday FTMAC100 10/100 Ethernet driver

Le lundi 17 janvier 2011 à 17:21 +0800, Po-Yu Chuang a écrit :


> +
> +	spin_lock_irqsave(&priv->tx_lock, flags);
> +	ftmac100_txdes_set_skb(txdes, skb);
> +	ftmac100_txdes_set_dma_addr(txdes, map);
> +
> +	ftmac100_txdes_set_first_segment(txdes);
> +	ftmac100_txdes_set_last_segment(txdes);
> +	ftmac100_txdes_set_txint(txdes);
> +	ftmac100_txdes_set_buffer_size(txdes, len);
> +

I wonder if its not too expensive to read/modify/write txdes->txdes1

Maybe you should use a temporary u32 var and perform one final write on
txdes->txdes1 (with the set_dma_own)

> +	priv->tx_pending++;
> +	if (priv->tx_pending == TX_QUEUE_ENTRIES) {
> +		if (net_ratelimit())
> +			netdev_info(netdev, "tx queue full\n");
> +
> +		netif_stop_queue(netdev);
> +	}
> +
> +	/* start transmit */
> +	ftmac100_txdes_set_dma_own(txdes);

	txdes->txdes1 = txdes1;

BTW, shouldnt you use cpu_to_be32() or cpu_to_le32(), if this driver is
multi platform ?



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