netdev - Re: [PATCH net-next v4 1/1] net: fec: Enable imx6 enet checksum acceleration.

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Date:	Fri, 19 Apr 2013 08:29:58 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jim Baxter <jim_baxter@...tor.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Fabio Estevam <fabio.estevam@...escale.com>,
	Frank Li <Frank.Li@...escale.com>,
	Fugang Duan <B38611@...escale.com>, netdev@...r.kernel.org,
	Ben Hutchings <bhutchings@...arflare.com>
Subject: Re: [PATCH net-next v4 1/1] net: fec: Enable imx6 enet checksum
 acceleration.

On Fri, 2013-04-19 at 16:10 +0100, Jim Baxter wrote:
>  
> +static int
> +fec_enet_clear_csum(struct sk_buff *skb, struct net_device *ndev)
> +{
> +	/* Only run for packets requiring a checksum. */
> +	if (skb->ip_summed != CHECKSUM_PARTIAL)
> +		return 0;
> +
> +	if (unlikely(skb_cow_head(skb, 0)))
> +		return -1;
> +
> +	*(__sum16 *)(skb->head + skb->csum_start + skb->csum_offset) = 0;
> +
> +	return 0;
> +}


 
> +	/* HW acceleration for ICMP TCP UDP checksum */
> +	if (fec_enet_clear_csum(skb, ndev))
> +		return NETDEV_TX_BUSY;

No : You must drop the packet and return NETDEV_TX_OK



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