From: Ivo van Doorn <ivdoorn@gmail.com>
To: Johannes Berg <johannes@sipsolutions.net>
Cc: "John W. Linville" <linville@tuxdriver.com>,
linux-wireless@vger.kernel.org
Subject: Re: [PATCH 06/12] rt2x00: Put 802.11 data on 4 byte boundary
Date: Fri, 11 Jan 2008 20:51:41 +0100 [thread overview]
Message-ID: <200801112051.41913.IvDoorn@gmail.com> (raw)
In-Reply-To: <1200011531.3861.118.camel@johannes.berg>
Hi,
> Sorry I'm late in noticing this :\
>
> > + /*
> > + * The data behind the ieee80211 header must be
> > + * aligned on a 4 byte boundary.
> > + */
> > + align = NET_IP_ALIGN + (2 * (header_size % 4 == 0));
>
> I don't think you should be using NET_IP_ALIGN at all, I think the code
> should be just
>
> align = header_size % 4;
>
> (which will evaluate to two or four).
Makes sense. I'll fix this asap.
> I have, so far, in mac80211 forced you to align the 802.11 data payload
> to a four-byte boundary *even on powerpc* which is the only platform
> where NET_IP_ALIGN is not two (it is zero because DMA sucks when done to
> unaligned addresses on some powerpc machines).
Ouch, that would make rt2x00usb panicking as soon as it is used when
NET_IP_ALIGN in 0 and alignment is needed. :S
This will be fixed asap as well.
Thanks,
Ivo
next prev parent reply other threads:[~2008-01-11 19:51 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-06 22:37 Please pull 'upstream' branch of rt2x00 Ivo van Doorn
2008-01-06 22:38 ` [PATCH 01/12] rt2x00: Fix chipset debugfs file Ivo van Doorn
2008-01-06 22:38 ` [PATCH 02/12] rt2x00: Always call ieee80211_stop_queue() when return NETDEV_TX_BUSY Ivo van Doorn
2008-01-06 22:38 ` [PATCH 03/12] rt2x00: Only set the TBCN flag when the interface is configured to send beacons Ivo van Doorn
2008-01-06 22:39 ` [PATCH 04/12] rt2x00: Store queue idx and entry idx in data_ring and data_entry Ivo van Doorn
2008-01-06 22:40 ` [PATCH 05/12] rt2x00: Move start() and stop() handlers into rt2x00lib.c Ivo van Doorn
2008-01-06 22:40 ` [PATCH 06/12] rt2x00: Put 802.11 data on 4 byte boundary Ivo van Doorn
2008-01-11 0:32 ` Johannes Berg
2008-01-11 19:51 ` Ivo van Doorn [this message]
2008-01-06 22:40 ` [PATCH 07/12] rt2x00: Move packet filter flags Ivo van Doorn
2008-01-06 22:41 ` [PATCH 08/12] rt2x00: Cleanup write_tx_desc() arguments Ivo van Doorn
2008-01-06 22:41 ` [PATCH 09/12] rt2x00: Determine MY_BSS from descriptor Ivo van Doorn
2008-01-06 22:41 ` [PATCH 10/12] rt2x00: Move init_txring and init_rxring into rt2x00lib Ivo van Doorn
2008-01-06 22:42 ` [PATCH 11/12] rt2x00: Correctly initialize data and desc pointer Ivo van Doorn
2008-01-06 22:42 ` [PATCH 12/12] rt2x00: Release rt2x00 2.0.14 Ivo van Doorn
2008-01-10 11:52 ` [Rt2400-devel] Please pull 'upstream' branch of rt2x00 Will Dyson
2008-01-10 15:46 ` John W. Linville
2008-01-10 17:29 ` Ivo van Doorn
2008-01-15 0:44 ` Will Dyson
2008-01-10 17:29 ` Ivo van Doorn
2008-01-10 20:32 ` Stefan Lippers-Hollmann
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