ath9k: store frame information used by aggregation inside the skb tx info

Since the pointers after the rates in the tx info cannot be used anymore
after frames have been queued, this area can be used to store information
that was previously stored in the ath_buf. With these changes, we can delay
the ath_buf assignment in the aggregation code until aggregates are formed.

That will not only make it possible to simplify DMA descriptor setup to
do less rewriting of uncached memory, but will also make it easier to
move aggregation out of the core of the ath9k tx path.
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/ath9k.h

@@ -89,20 +89,16 @@ struct ath_config {
  * @BUF_AMPDU: This buffer is an ampdu, as part of an aggregate (during TX)
  * @BUF_AGGR: Indicates whether the buffer can be aggregated
  *	(used in aggregation scheduling)
- * @BUF_RETRY: Indicates whether the buffer is retried
  * @BUF_XRETRY: To denote excessive retries of the buffer
  */
 enum buffer_type {
 	BUF_AMPDU		= BIT(2),
 	BUF_AGGR		= BIT(3),
-	BUF_RETRY		= BIT(4),
 	BUF_XRETRY		= BIT(5),
 };
 
-#define bf_retries      	bf_state.bfs_retries
 #define bf_isampdu(bf)		(bf->bf_state.bf_type & BUF_AMPDU)
 #define bf_isaggr(bf)		(bf->bf_state.bf_type & BUF_AGGR)
-#define bf_isretried(bf)	(bf->bf_state.bf_type & BUF_RETRY)
 #define bf_isxretried(bf)	(bf->bf_state.bf_type & BUF_XRETRY)
 
 #define ATH_TXSTATUS_RING_SIZE 64
@@ -207,8 +203,15 @@ struct ath_atx_ac {
 	struct list_head tid_q;
 };
 
+struct ath_frame_info {
+	int framelen;
+	u32 keyix;
+	enum ath9k_key_type keytype;
+	u8 retries;
+	u16 seqno;
+};
+
 struct ath_buf_state {
-	int bfs_retries;
 	u8 bf_type;
 	u8 bfs_paprd;
 	enum ath9k_internal_frame_type bfs_ftype;
@@ -260,9 +263,9 @@ struct ath_node {
 
 struct ath_tx_control {
 	struct ath_txq *txq;
+	struct ath_node *an;
 	int if_id;
 	enum ath9k_internal_frame_type frame_type;
-	int frmlen;
 	u8 paprd;
 };