rt2x00: trim skb_frame_desc to 32 bytes

Remove frame_type from skb_frame_desc and pass it
as argument to rt2x00debug_dump_frame().

Change data_len and desc_len to unsigned short
to save another 4 bytes in skb_frame_desc. Note that
this was the only location where the data_len and
desc_len was not yet treated as unsigned short.

This trim is required to help mac80211 with adding
the TX control and TX status informtation into the
skb->cb structure. When that happens, drivers will
have approximately 40 bytes left to use freely.

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

4 files changed, 13 insertions, 17 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2x00debug.c b/drivers/net/wireless/rt2x00/rt2x00debug.c
index bfab3b8780d6..bd92cb8e68e0 100644
--- a/drivers/net/wireless/rt2x00/rt2x00debug.c
+++ b/drivers/net/wireless/rt2x00/rt2x00debug.c
@@ -115,7 +115,7 @@ struct rt2x00debug_intf {
 };
 
 void rt2x00debug_dump_frame(struct rt2x00_dev *rt2x00dev,
-                            struct sk_buff *skb)
+                            enum rt2x00_dump_type type, struct sk_buff *skb)
 {
         struct rt2x00debug_intf *intf = rt2x00dev->debugfs_intf;
         struct skb_frame_desc *desc = get_skb_frame_desc(skb);
@@ -148,7 +148,7 @@ void rt2x00debug_dump_frame(struct rt2x00_dev *rt2x00dev,
         dump_hdr->chip_rt = cpu_to_le16(rt2x00dev->chip.rt);
         dump_hdr->chip_rf = cpu_to_le16(rt2x00dev->chip.rf);
         dump_hdr->chip_rev = cpu_to_le32(rt2x00dev->chip.rev);
-        dump_hdr->type = cpu_to_le16(desc->frame_type);
+        dump_hdr->type = cpu_to_le16(type);
         dump_hdr->queue_index = desc->entry->queue->qid;
         dump_hdr->entry_index = desc->entry->entry_idx;
         dump_hdr->timestamp_sec = cpu_to_le32(timestamp.tv_sec);
diff --git a/drivers/net/wireless/rt2x00/rt2x00dev.c b/drivers/net/wireless/rt2x00/rt2x00dev.c
index 3a49c256789f..ea130f2eb008 100644
--- a/drivers/net/wireless/rt2x00/rt2x00dev.c
+++ b/drivers/net/wireless/rt2x00/rt2x00dev.c
@@ -28,7 +28,6 @@
 
 #include "rt2x00.h"
 #include "rt2x00lib.h"
-#include "rt2x00dump.h"
 
 /*
  * Link tuning handlers
@@ -540,11 +539,9 @@ void rt2x00lib_txdone(struct queue_entry *entry,
          * If send to mac80211, mac80211 will clean up the skb structure,
          * otherwise we have to do it ourself.
          */
-        skbdesc = get_skb_frame_desc(entry->skb);
-        skbdesc->frame_type = DUMP_FRAME_TXDONE;
-
-        rt2x00debug_dump_frame(rt2x00dev, entry->skb);
+        rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry->skb);
 
+        skbdesc = get_skb_frame_desc(entry->skb);
         if (!(skbdesc->flags & FRAME_DESC_DRIVER_GENERATED))
                 ieee80211_tx_status_irqsafe(rt2x00dev->hw,
                                             entry->skb, &tx_status);
@@ -610,8 +607,7 @@ void rt2x00lib_rxdone(struct queue_entry *entry,
          * Send frame to mac80211 & debugfs.
          * mac80211 will clean up the skb structure.
          */
-        get_skb_frame_desc(entry->skb)->frame_type = DUMP_FRAME_RXDONE;
-        rt2x00debug_dump_frame(rt2x00dev, entry->skb);
+        rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry->skb);
         ieee80211_rx_irqsafe(rt2x00dev->hw, entry->skb, rx_status);
         entry->skb = NULL;
 }
@@ -752,8 +748,7 @@ void rt2x00lib_write_tx_desc(struct rt2x00_dev *rt2x00dev,
          * frame to the device, but we are going to push the
          * frame to debugfs here.
          */
-        skbdesc->frame_type = DUMP_FRAME_TX;
-        rt2x00debug_dump_frame(rt2x00dev, skb);
+        rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TX, skb);
 }
 EXPORT_SYMBOL_GPL(rt2x00lib_write_tx_desc);
 
diff --git a/drivers/net/wireless/rt2x00/rt2x00lib.h b/drivers/net/wireless/rt2x00/rt2x00lib.h
index 41ee02cd2825..c4ce534e3cdb 100644
--- a/drivers/net/wireless/rt2x00/rt2x00lib.h
+++ b/drivers/net/wireless/rt2x00/rt2x00lib.h
@@ -26,6 +26,8 @@
 #ifndef RT2X00LIB_H
 #define RT2X00LIB_H
 
+#include "rt2x00dump.h"
+
 /*
  * Interval defines
  * Both the link tuner as the rfkill will be called once per second.
@@ -128,7 +130,8 @@ static inline void rt2x00lib_free_firmware(struct rt2x00_dev *rt2x00dev)
 #ifdef CONFIG_RT2X00_LIB_DEBUGFS
 void rt2x00debug_register(struct rt2x00_dev *rt2x00dev);
 void rt2x00debug_deregister(struct rt2x00_dev *rt2x00dev);
-void rt2x00debug_dump_frame(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb);
+void rt2x00debug_dump_frame(struct rt2x00_dev *rt2x00dev,
+                            enum rt2x00_dump_type type, struct sk_buff *skb);
 #else
 static inline void rt2x00debug_register(struct rt2x00_dev *rt2x00dev)
 {
@@ -139,6 +142,7 @@ static inline void rt2x00debug_deregister(struct rt2x00_dev *rt2x00dev)
 }
 
 static inline void rt2x00debug_dump_frame(struct rt2x00_dev *rt2x00dev,
+                                          enum rt2x00_dump_type type,
                                           struct sk_buff *skb)
 {
 }
diff --git a/drivers/net/wireless/rt2x00/rt2x00queue.h b/drivers/net/wireless/rt2x00/rt2x00queue.h
index d1707a7ca41f..c3493ed7f4c3 100644
--- a/drivers/net/wireless/rt2x00/rt2x00queue.h
+++ b/drivers/net/wireless/rt2x00/rt2x00queue.h
@@ -109,7 +109,6 @@ enum skb_frame_desc_flags {
  * this structure should not exceed the size of that array (48 bytes).
  *
  * @flags: Frame flags, see &enum skb_frame_desc_flags.
- * @frame_type: Frame type, see &enum rt2x00_dump_type.
  * @data: Pointer to data part of frame (Start of ieee80211 header).
  * @desc: Pointer to descriptor part of the frame.
  *      Note that this pointer could point to something outside
@@ -121,14 +120,12 @@ enum skb_frame_desc_flags {
 struct skb_frame_desc {
         unsigned int flags;
 
-        unsigned int frame_type;
+        unsigned short data_len;
+        unsigned short desc_len;
 
         void *data;
         void *desc;
 
-        unsigned int data_len;
-        unsigned int desc_len;
-
         struct queue_entry *entry;
 };