netdev - Re: [PATCH net-next 1/2] net: Expose header length compution function

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Date:	Fri, 09 May 2014 16:24:54 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	amirv@...lanox.com
Cc:	netdev@...r.kernel.org, idos@...lanox.com,
	jeffrey.t.kirsher@...el.com, jesse.brandeburg@...el.com,
	bruce.w.allan@...el.com, carolyn.wyborny@...el.com,
	donald.c.skidmore@...el.com, gregory.v.rose@...el.com,
	alexander.h.duyck@...el.com, john.ronciak@...el.com,
	mitch.a.williams@...el.com, yevgenyp@...lanox.com,
	ogerlitz@...lanox.com
Subject: Re: [PATCH net-next 1/2] net: Expose header length compution
 function

From: Amir Vadai <amirv@...lanox.com>
Date: Thu,  8 May 2014 15:50:33 +0300

> From: Ido Shamay <idos@...lanox.com>
> 
> This commit exposes an header length compution generic function,
> introduced in some of Intel's Etherent drivers (igb and ixgbe),
> to net public namespace under the name __net_get_headlen,
> where it can be used by other vendors and removes code duplication.
> 
> Signed-off-by: Ido Shamay <idos@...lanox.com>
> Signed-off-by: Amir Vadai <amirv@...lanox.com>

First of all, this appears (at least to me) to duplicate a lot of
what the existing flow dissector can do.

For example, you can probably call skb_flow_dissect() and the
filled in flow_keys has much of what you need.  If it doesn't
have everything you need consider extending it.

Even if that won't work out, you must add a detailed comment, with
kernel doc, above the declaration for this new interface in the
header file.

I honestly still have no idea exactly what this function does and
exactly what it's trying to achieve.
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