netdev - Re: [PATCH net-next V2] gro: introduce gro_mac_header

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Date:	Tue, 07 Feb 2012 15:33:25 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	roland@...nel.org
Cc:	eric.dumazet@...il.com, ogerlitz@...lanox.com,
	sean.hefty@...el.com, herbert@...dor.hengli.com.au,
	linux-rdma@...r.kernel.org, shlomop@...lanox.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH net-next V2] gro: introduce gro_mac_header_len

From: Roland Dreier <roland@...nel.org>
Date: Tue, 7 Feb 2012 11:51:46 -0800

Overall, looks great.

> @@ -843,9 +837,8 @@ static int ipoib_hard_header(struct sk_buff *skb,
>  	if (dst)
>  		n = dst_get_neighbour_noref_raw(dst);
>  	if ((!dst || !n) && daddr) {
> -		struct ipoib_pseudoheader *phdr =
> -			(struct ipoib_pseudoheader *) skb_push(skb, sizeof *phdr);
> -		memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
> +		struct ipoib_cb *cb = (struct ipoib_cb *) skb->cb;
> +		memcpy(cb->hwaddr, daddr, INFINIBAND_ALEN);

I would simplify this to "!skb_dst(skb)", any failure of
dst_get_neighbour_noref_raw() (now and in the future) would be
transient.

You're trying to see if this is a "neigh resolvable" path or not, and
the correct test for that is whether a dst is attached to the SKB.

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