rt2x00: Improve TX status handling for BlockAckReq frames

Since rt2800 hardware isn't capable of reporting the TX status of
BlockAckReq frames implement the TX status handling of BARs in
rt2x00lib. We keep track of all BARs that are send out and try to
match incoming BAs to the appropriate BARs. This allows us to report a
more or less accurate TX status for BAR frames which in turn improves
BA session stability.

This is loosley based on Christian Lamparter's patch for carl9170
"carl9170: fix HT peer BA session corruption".

We have to walk the list of pending BARs for every rx'red BA even
though most BAs don't belong to any of these BARs as they are just
acknowledging an AMPDU. To keep that overhead low use RCU which allows
us to walk the list of pending BARs without the need to acquire a lock.
This however requires us to _copy_ relevant information from the BAR
(RA, TA, control field, start sequence number) into our BAR list entry.

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Tested-by: Andreas Hartmann <andihartmann@01019freenet.de>
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2x00.h b/drivers/net/wireless/rt2x00/rt2x00.h
index 0751b35ef6dc..b52512b8ac5f 100644
--- a/drivers/net/wireless/rt2x00/rt2x00.h
+++ b/drivers/net/wireless/rt2x00/rt2x00.h
@@ -1016,6 +1016,26 @@ struct rt2x00_dev {
 	 * Protect the interrupt mask register.
 	 */
 	spinlock_t irqmask_lock;
+
+	/*
+	 * List of BlockAckReq TX entries that need driver BlockAck processing.
+	 */
+	struct list_head bar_list;
+	spinlock_t bar_list_lock;
+};
+
+struct rt2x00_bar_list_entry {
+	struct list_head list;
+	struct rcu_head head;
+
+	struct queue_entry *entry;
+	int block_acked;
+
+	/* Relevant parts of the IEEE80211 BAR header */
+	__u8 ra[6];
+	__u8 ta[6];
+	__le16 control;
+	__le16 start_seq_num;
 };
 
 /*