rt2x00: Add support for L2 padding during TX/RX

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>

1 files changed, 12 insertions, 2 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2x00queue.h b/drivers/net/wireless/rt2x00/rt2x00queue.h
index e3bfd73..13e0ece 100644
--- a/drivers/net/wireless/rt2x00/rt2x00queue.h
+++ b/drivers/net/wireless/rt2x00/rt2x00queue.h
@@ -87,13 +87,16 @@ enum data_queue_qid {
  *
  * @SKBDESC_DMA_MAPPED_RX: &skb_dma field has been mapped for RX
  * @SKBDESC_DMA_MAPPED_TX: &skb_dma field has been mapped for TX
- * @FRAME_DESC_IV_STRIPPED: Frame contained a IV/EIV provided by
+ * @SKBDESC_IV_STRIPPED: Frame contained a IV/EIV provided by
  *	mac80211 but was stripped for processing by the driver.
+ * @SKBDESC_L2_PADDED: Payload has been padded for 4-byte alignment,
+ *	the padded bytes are located between header and payload.
  */
 enum skb_frame_desc_flags {
 	SKBDESC_DMA_MAPPED_RX = 1 << 0,
 	SKBDESC_DMA_MAPPED_TX = 1 << 1,
-	FRAME_DESC_IV_STRIPPED = 1 << 2,
+	SKBDESC_IV_STRIPPED = 1 << 2,
+	SKBDESC_L2_PADDED = 1 << 3
 };
 
 /**
@@ -148,6 +151,7 @@ static inline struct skb_frame_desc* get_skb_frame_desc(struct sk_buff *skb)
  * @RXDONE_MY_BSS: Does this frame originate from device's BSS.
  * @RXDONE_CRYPTO_IV: Driver provided IV/EIV data.
  * @RXDONE_CRYPTO_ICV: Driver provided ICV data.
+ * @RXDONE_L2PAD: 802.11 payload has been padded to 4-byte boundary.
  */
 enum rxdone_entry_desc_flags {
 	RXDONE_SIGNAL_PLCP = 1 << 0,
@@ -155,6 +159,7 @@ enum rxdone_entry_desc_flags {
 	RXDONE_MY_BSS = 1 << 2,
 	RXDONE_CRYPTO_IV = 1 << 3,
 	RXDONE_CRYPTO_ICV = 1 << 4,
+	RXDONE_L2PAD = 1 << 5,
 };
 
 /**
@@ -267,6 +272,8 @@ enum txentry_desc_flags {
  *
  * @flags: Descriptor flags (See &enum queue_entry_flags).
  * @queue: Queue identification (See &enum data_queue_qid).
+ * @header_length: Length of 802.11 header.
+ * @l2pad: Amount of padding to align 802.11 payload to 4-byte boundrary.
  * @length_high: PLCP length high word.
  * @length_low: PLCP length low word.
  * @signal: PLCP signal.
@@ -287,6 +294,9 @@ struct txentry_desc {
 
 	enum data_queue_qid queue;
 
+	u16 header_length;
+	u16 l2pad;
+
 	u16 length_high;
 	u16 length_low;
 	u16 signal;