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

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Date:	Mon, 17 Jan 2011 18:29:14 +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 :


> +static int ftmac100_rx_packet(struct ftmac100 *priv, int *processed)
> +{
> +	struct net_device *netdev = priv->netdev;
> +	struct ftmac100_rxdes *rxdes;
> +	struct sk_buff *skb;
> +	int length;
> +	int copied = 0;
> +	int done = 0;
> +
> +	rxdes = ftmac100_rx_locate_first_segment(priv);
> +	if (!rxdes)
> +		return 0;
> +
> +	length = ftmac100_rxdes_frame_length(rxdes);
> +
> +	netdev->stats.rx_packets++;
> +	netdev->stats.rx_bytes += length;
> +
> +	if (unlikely(ftmac100_rx_packet_error(priv, rxdes))) {
> +		ftmac100_rx_drop_packet(priv);
> +		return 1;
> +	}
> +
> +	/* start processing */
> +	skb = netdev_alloc_skb_ip_align(netdev, length);
> +	if (unlikely(!skb)) {
> +		if (net_ratelimit())
> +			netdev_err(netdev, "rx skb alloc failed\n");
> +
> +		ftmac100_rx_drop_packet(priv);
> +		return 1;
> +	}
> +

Please dont increase rx_packets/rx_bytes before the
netdev_alloc_skb_ip_align().

In case of mem allocation failure, it would be better not pretending we
handled a packet.

drivers/net/r8169.c for example does the rx_packets/rx_bytes only if
packet is delivered to upper stack.



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