ath9k: make per-WMM-AC queue sizes configurable via debugfs

Prepare for using different queue size defaults for each AC.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/debug.c b/drivers/net/wireless/ath/ath9k/debug.c
index 5c3192f..b9ea067 100644
--- a/drivers/net/wireless/ath/ath9k/debug.c
+++ b/drivers/net/wireless/ath/ath9k/debug.c
@@ -1556,6 +1556,14 @@
 			    &fops_interrupt);
 	debugfs_create_file("xmit", S_IRUSR, sc->debug.debugfs_phy, sc,
 			    &fops_xmit);
+	debugfs_create_u32("qlen_bk", S_IRUSR | S_IWUSR, sc->debug.debugfs_phy,
+			   &sc->tx.txq_max_pending[WME_AC_BK]);
+	debugfs_create_u32("qlen_be", S_IRUSR | S_IWUSR, sc->debug.debugfs_phy,
+			   &sc->tx.txq_max_pending[WME_AC_BE]);
+	debugfs_create_u32("qlen_vi", S_IRUSR | S_IWUSR, sc->debug.debugfs_phy,
+			   &sc->tx.txq_max_pending[WME_AC_VI]);
+	debugfs_create_u32("qlen_vo", S_IRUSR | S_IWUSR, sc->debug.debugfs_phy,
+			   &sc->tx.txq_max_pending[WME_AC_VO]);
 	debugfs_create_file("stations", S_IRUSR, sc->debug.debugfs_phy, sc,
 			    &fops_stations);
 	debugfs_create_file("misc", S_IRUSR, sc->debug.debugfs_phy, sc,