ath9k_hw: optimize all descriptor access functions
Because all of the descriptor data structures are marked as __packed, GCC
assumes the worst case wrt. alignment and generates unaligned load/store
instructions on MIPS for access to all fields.
Since descriptors always have to be 4-byte-aligned, we can just mark the
data structures with __aligned(4), which allows GCC to generate much more
efficient code.
Verified through disassembly and OProfile comparisons.
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/ar9003_mac.h b/drivers/net/wireless/ath/ath9k/ar9003_mac.h
index 9f2cea7..45cc7e8 100644
--- a/drivers/net/wireless/ath/ath9k/ar9003_mac.h
+++ b/drivers/net/wireless/ath/ath9k/ar9003_mac.h
@@ -65,7 +65,7 @@
u32 status9;
u32 status10;
u32 status11;
-} __packed;
+} __packed __aligned(4);
/* Transmit Control Descriptor */
struct ar9003_txc {
@@ -93,7 +93,7 @@
u32 ctl21; /* DMA control 21 */
u32 ctl22; /* DMA control 22 */
u32 pad[9]; /* pad to cache line (128 bytes/32 dwords) */
-} __packed;
+} __packed __aligned(4);
struct ar9003_txs {
u32 ds_info;
@@ -105,7 +105,7 @@
u32 status6;
u32 status7;
u32 status8;
-} __packed;
+} __packed __aligned(4);
void ar9003_hw_attach_mac_ops(struct ath_hw *hw);
void ath9k_hw_set_rx_bufsize(struct ath_hw *ah, u16 buf_size);