linux-kernel - Re: [PATCH net-next 09/12] r8152: support IPv6

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Message-ID: <1393952328.26794.123.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Tue, 04 Mar 2014 08:58:48 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Hayes Wang <hayeswang@...ltek.com>
Cc:	netdev@...r.kernel.org, nic_swsd@...ltek.com,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH net-next 09/12] r8152: support IPv6

On Tue, 2014-03-04 at 20:01 +0800, Hayes Wang wrote:
> Support hw IPv6 checksum for TCP and UDP packets.


> +/*
> + * r8152_csum_workaround()
> + * The hw limites the value the transport offset. When the offset is out of the
> + * range, calculate the checksum by sw.
> + */
> +static void r8152_csum_workaround(struct r8152 *tp, struct sk_buff *skb,
> +				  struct sk_buff_head *list)
> +{
> +	if (skb_shinfo(skb)->gso_size) {
> +		netdev_features_t features = tp->netdev->features;
> +		struct sk_buff *segs, *nskb;
> +
> +		features &= ~(NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_TSO);
> +		segs = skb_gso_segment(skb, features);
> +		if (IS_ERR(segs) || !segs)
> +			goto drop;
> +
> +		do {
> +			nskb = segs;
> +			segs = segs->next;
> +			nskb->next = NULL;
> +			__skb_queue_head(list, nskb);

This introduces TCP reordering.

You should use some kind of skb_queue_splice()



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