netdev - Re: [Bugme-new] [Bug 11144] New: dhcp doesn't work with iwl4965

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Date:	Thu, 24 Jul 2008 13:17:46 +0300
From:	"Tomas Winkler" <tomasw@...il.com>
To:	"Patrick McHardy" <kaber@...sh.net>
Cc:	"David Miller" <davem@...emloft.net>,
	francois.valenduc@...ablenet.be, akpm@...ux-foundation.org,
	bugme-daemon@...zilla.kernel.org, linux-wireless@...r.kernel.org,
	linville@...driver.com, netdev@...r.kernel.org,
	jussi.kivilinna@...et.fi
Subject: Re: [Bugme-new] [Bug 11144] New: dhcp doesn't work with iwl4965

On Thu, Jul 24, 2008 at 11:58 AM, Patrick McHardy <kaber@...sh.net> wrote:
> David Miller wrote:
>>
>> From: Patrick McHardy <kaber@...sh.net>
>> Date: Wed, 23 Jul 2008 18:25:48 +0200
>>
>>> We can't fit them into the cb together, I don't see a way to
>>> shrink ieee80211_tx_info.
>>>
>>> Maybe one of the wireless folks can suggest something? Is it
>>> really necessary to pass the full struct ieee80211_tx_info
>>> through the qdisc layer, or could the struct be split? It
>>> needs to find a way to co-exist peacefully with qdiscs'
>>> skb->cb usage.
>>
>> This is another area that got mangled up in the ->select_queue()
>> conversion of the WME bits, but in another aspect this problem
>> existed beforehand as well.
>>
>> Specifically, when RX packets get requeued out to transmit in
>> the code in net/mac80211/rx.c that resends packets back out the
>> wireless device by setting a bit in the SKB CB then calling
>> dev_queue_xmit().
>>
>> That's completely illegal :-)
>
> It seems its doing even more illegal things that were also
> present previously. The ieee80211_master_start_xmit function
> expects to get a valid IEEE80211_SKB_CB, which means it
> expects it to survive through the entire qdisc layer. I'm
> not sure how packets get to the master device from the
> subifs though, so I might be wrong.
>
Isn't this time to make 802.11 native?
Tomas.
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