linux-kernel - Re: [PATCH v4 1/5] net: Add support for hardware-offloaded encapsulation

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Date:	Mon, 10 Dec 2012 12:04:15 +0200
From:	saeed bishara <saeed.bishara@...il.com>
To:	Joseph Gasparakis <joseph.gasparakis@...el.com>
Cc:	davem@...emloft.net, shemminger@...tta.com, chrisw@...s-sol.org,
	gospo@...hat.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, dmitry@...adcom.com,
	bhutchings@...arflare.com,
	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>,
	Alexander Duyck <alexander.h.duyck@...el.com>
Subject: Re: [PATCH v4 1/5] net: Add support for hardware-offloaded encapsulation

> +static inline struct iphdr *inner_ip_hdr(const struct sk_buff *skb)
> +{
> +       return (struct iphdr *)skb_inner_network_header(skb);
> +}

Hi,
I'm a little bit bothered because of those inner_ functions, what
about the following approach:
1. the skb will have a new state, that state can be outer (normal
mode) and inner.
2. when you change the state to inner, all the helper functions such
as ip_hdr will return the innter header.

that's ofcourse the API side. the implementation may still use the
fields you added to the skb.

what you think?
saeed
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