netdev - Re: [PATCH v5] net: add Faraday FTMAC100 10/100 Ethernet driver

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Date:	Mon, 24 Jan 2011 16:07:42 +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,
	bhutchings@...arflare.com, joe@...ches.com, dilinger@...ued.net,
	mirqus@...il.com, Po-Yu Chuang <ratbert@...aday-tech.com>
Subject: Re: [PATCH v5] net: add Faraday FTMAC100 10/100 Ethernet driver

Le lundi 24 janvier 2011 à 20:39 +0800, Po-Yu Chuang a écrit :
> From: Po-Yu Chuang <ratbert@...aday-tech.com>


> +static int ftmac100_xmit(struct ftmac100 *priv, struct sk_buff *skb,
> +			 dma_addr_t map)
> +{
> +	struct net_device *netdev = priv->netdev;
> +	struct ftmac100_txdes *txdes;
> +	unsigned int len = (skb->len < ETH_ZLEN) ? ETH_ZLEN : skb->len;
> +
> +	txdes = ftmac100_current_txdes(priv);
> +	ftmac100_tx_pointer_advance(priv);
> +
> +	/* setup TX descriptor */
> +
> +	spin_lock(&priv->tx_lock);
> +	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);
> +
> +	priv->tx_pending++;
> +	if (priv->tx_pending == TX_QUEUE_ENTRIES) {
> +		if (net_ratelimit())
> +			netdev_info(netdev, "tx queue full\n");

Hmm, I guess you didnt tested your driver with a pktgen flood ;)

This 'netdev_info(netdev, "tx queue full\n");' is not necessary, since
its a pretty normal condition for a driver (to fill its TX ring buffer)

> +
> +		netif_stop_queue(netdev);
> +	}
> +
> +	/* start transmit */
> +	ftmac100_txdes_set_dma_own(txdes);
> +	spin_unlock(&priv->tx_lock);
> +
> +	ftmac100_txdma_start_polling(priv);
> +
> +	return NETDEV_TX_OK;
> +}


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