rt2x00: Reorganize padding & L2 padding

The old function rt2x00queue_payload_align() handled
both adding and removing L2 padding and some basic
frame alignment. The entire function was being abused
because it had multiple functions and the header length
argument was somtimes used to align the header instead
of the payload.

Additionally there was a bug when inserting L2 padding
that only the payload was aligned but not the header. This
happens when the header wasn't aligned properly by mac80211,
but rt2x00lib only moves the payload.

A secondary problem was that when removing L2 padding during
TXdone or RX the skb wasn't resized to the proper size.

Split the function into seperate functions each handling
its task as it should.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 33 insertions, 12 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2x00lib.h b/drivers/net/wireless/rt2x00/rt2x00lib.h
index eeb2881..5462cb5 100644
--- a/drivers/net/wireless/rt2x00/rt2x00lib.h
+++ b/drivers/net/wireless/rt2x00/rt2x00lib.h
@@ -120,21 +120,42 @@ void rt2x00queue_unmap_skb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb);
 void rt2x00queue_free_skb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb);
 
 /**
- * rt2x00queue_payload_align - Align 802.11 payload to 4-byte boundary
+ * rt2x00queue_align_frame - Align 802.11 frame to 4-byte boundary
+ * @skb: The skb to align
+ *
+ * Align the start of the 802.11 frame to a 4-byte boundary, this could
+ * mean the payload is not aligned properly though.
+ */
+void rt2x00queue_align_frame(struct sk_buff *skb);
+
+/**
+ * rt2x00queue_align_payload - Align 802.11 payload to 4-byte boundary
+ * @skb: The skb to align
+ * @header_length: Length of 802.11 header
+ *
+ * Align the 802.11 payload to a 4-byte boundary, this could
+ * mean the header is not aligned properly though.
+ */
+void rt2x00queue_align_payload(struct sk_buff *skb, unsigned int header_length);
+
+/**
+ * rt2x00queue_insert_l2pad - Align 802.11 header & payload to 4-byte boundary
+ * @skb: The skb to align
+ * @header_length: Length of 802.11 header
+ *
+ * Apply L2 padding to align both header and payload to 4-byte boundary
+ */
+void rt2x00queue_insert_l2pad(struct sk_buff *skb, unsigned int header_length);
+
+/**
+ * rt2x00queue_insert_l2pad - Remove L2 padding from 802.11 frame
  * @skb: The skb to align
- * @l2pad: Should L2 padding be used
  * @header_length: Length of 802.11 header
  *
- * This function prepares the @skb to be send to the device or mac80211.
- * If @l2pad is set to true padding will occur between the 802.11 header
- * and payload. Otherwise the padding will be done in front of the 802.11
- * header.
- * When @l2pad is set the function will check for the &SKBDESC_L2_PADDED
- * flag in &skb_frame_desc. If that flag is set, the padding is removed
- * and the flag cleared. Otherwise the padding is added and the flag is set.
+ * Remove L2 padding used to align both header and payload to 4-byte boundary,
+ * by removing the L2 padding the header will no longer be 4-byte aligned.
  */
-void rt2x00queue_payload_align(struct sk_buff *skb,
-			       bool l2pad, unsigned int header_length);
+void rt2x00queue_remove_l2pad(struct sk_buff *skb, unsigned int header_length);
 
 /**
  * rt2x00queue_write_tx_frame - Write TX frame to hardware
@@ -324,7 +345,7 @@ void rt2x00crypto_tx_copy_iv(struct sk_buff *skb,
 void rt2x00crypto_tx_remove_iv(struct sk_buff *skb,
 			       struct txentry_desc *txdesc);
 void rt2x00crypto_tx_insert_iv(struct sk_buff *skb, unsigned int header_length);
-void rt2x00crypto_rx_insert_iv(struct sk_buff *skb, bool l2pad,
+void rt2x00crypto_rx_insert_iv(struct sk_buff *skb,
 			       unsigned int header_length,
 			       struct rxdone_entry_desc *rxdesc);
 #else