netdev - Re: mac80211 truesize bugs

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Date:	Wed, 14 May 2008 00:12:09 +0300
From:	"Tomas Winkler" <tomasw@...il.com>
To:	"Johannes Berg" <johannes@...solutions.net>
Cc:	"John W. Linville" <linville@...driver.com>,
	"David Miller" <davem@...emloft.net>, herbert@...dor.apana.org.au,
	mb@...sch.de, netdev@...r.kernel.org,
	linux-wireless@...r.kernel.org
Subject: Re: mac80211 truesize bugs

On Tue, May 13, 2008 at 11:59 PM, Johannes Berg
<johannes@...solutions.net> wrote:
> On Tue, 2008-05-13 at 16:39 -0400, John W. Linville wrote:
>  > On Mon, May 12, 2008 at 08:17:51PM -0700, David Miller wrote:
>  >
>  > > Based upon them I will adjust LL_MAX_HEADER as follows:
>  >
>  > > @@ -93,14 +93,16 @@ struct wireless_dev;
>  > >   * used.
>  > >   */
>  > >
>  > > -#if !defined(CONFIG_AX25) && !defined(CONFIG_AX25_MODULE) && !defined(CONFIG_TR)
>  > > -#define LL_MAX_HEADER      32
>  > > +#if defined(CONFIG_WLAN_80211) || defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
>  >
>  > Is WLAN_80211 really the right symbol here?  It applies to more than
>  > just mac80211, and I doubt if full MAC devices need higher values.
>  > It seems like MAC80211 would be the right symbol to add.
>
>  Most fullmac devices also need some space, whether they do things that
>  way or not is a completely different thing, the ieee80211 stack for
>  example copies every packet into a new skb anyway.

It's really depends on when is the 802.3 to 802.11 header translation
made it doesn't matter whether it's fullmac or softmac. I would say
that WLAN is OK.

Tomas
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