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rt2x00: Add support for L2 padding during TX/RX

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Some hardware require L2 padding between header and payload
because both must be aligned to a 4-byte boundary. This hardware
also is easier during the RX path since we no longer need to
move the entire payload but rather only the header to remove
the padding (mac80211 only wants the payload to be 4-byte aligned).

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Ivo van Doorn
2009-04-26 16:08:50 +02:00
committed by John W. Linville
parent 9eb4e21e28
commit 9f1661718c
6 changed files with 143 additions and 48 deletions
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10
drivers/net/wireless/rt2x00/rt2x00.h
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@@ -102,6 +102,15 @@
#define GET_DURATION(__size, __rate) (((__size) * 8 * 10) / (__rate))
#define GET_DURATION_RES(__size, __rate)(((__size) * 8 * 10) % (__rate))
/*
* Determine the alignment requirement,
* to make sure the 802.11 payload is padded to a 4-byte boundrary
* we must determine the address of the payload and calculate the
* amount of bytes needed to move the data.
*/
#define ALIGN_SIZE(__skb, __header) \
( ((unsigned long)((__skb)->data + (__header))) & 3 )
/*
* Standard timing and size defines.
* These values should follow the ieee80211 specifications.
@@ -590,6 +599,7 @@ enum rt2x00_flags {
DRIVER_REQUIRE_SCHEDULED,
DRIVER_REQUIRE_DMA,
DRIVER_REQUIRE_COPY_IV,
DRIVER_REQUIRE_L2PAD,
/*
* Driver features