netdev - Re: gso: Attempt to handle mega-GRO packets

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Date:	Wed, 06 Nov 2013 23:11:02 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Ben Hutchings <bhutchings@...arflare.com>,
	David Miller <davem@...emloft.net>,
	christoph.paasch@...ouvain.be, netdev@...r.kernel.org,
	hkchu@...gle.com, mwdalton@...gle.com
Subject: Re: gso: Attempt to handle mega-GRO packets

On Thu, 2013-11-07 at 08:43 +0800, Herbert Xu wrote:

> -		if (fskb != skb_shinfo(skb)->frag_list)
> -			goto perform_csum_check;
> +		if (fskb != skb_shinfo(skb)->frag_list) {
> +			struct sk_buff *nsegs;
> +
> +			if (nskb->len == len + doffset)
> +				goto perform_csum_check;
> +
> +			if (skb_has_frag_list(nskb)) {
> +				net_warn_ratelimited(
> +					"skb_segment: "
> +					"nested frag_list detected\n");
> +				kfree(nskb);
> +				err = -EINVAL;
> +				goto err;
> +			}
> +
> +			__skb_pull(nskb, doffset);
> +			skb_shinfo(nskb)->gso_size = mss;
> +			nsegs = skb_segment(nskb, features);
> +

This still assumes each skb found in frag_list has a exact multiple of
@mss bytes, and that the initial skb also ends at a right boundary.



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