From 4d316c79a5dcc13dea8110f0fcf295a17b4b625b Mon Sep 17 00:00:00 2001 From: Michal Kazior Date: Thu, 26 Sep 2013 10:12:24 +0300 Subject: [PATCH] ath10k: align RX frames properly Ethernet-like decapping mode leaves IP protocol frame not aligned to 4-byte boundaries. This leads to re-aligning in mac80211 which in turn leads to poor CPU cache behaviour on some machines. Since HW doesn't allow to change payload offset properly the solution is to force HW to decap in Native Wifi mode which always has 24-bytes long 802.11 header (even for QoS frames). This means IP frame is properly aligned in this decap mode. Signed-off-by: Michal Kazior Signed-off-by: Kalle Valo --- drivers/net/wireless/ath/ath10k/hw.h | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/ath/ath10k/hw.h b/drivers/net/wireless/ath/ath10k/hw.h index 643f0c9f052b..8c1be7685922 100644 --- a/drivers/net/wireless/ath/ath10k/hw.h +++ b/drivers/net/wireless/ath/ath10k/hw.h @@ -74,7 +74,11 @@ enum ath10k_mcast2ucast_mode { #define TARGET_RX_CHAIN_MASK (BIT(0) | BIT(1) | BIT(2)) #define TARGET_RX_TIMEOUT_LO_PRI 100 #define TARGET_RX_TIMEOUT_HI_PRI 40 -#define TARGET_RX_DECAP_MODE ATH10K_HW_TXRX_ETHERNET + +/* Native Wifi decap mode is used to align IP frames to 4-byte boundaries and + * avoid a very expensive re-alignment in mac80211. */ +#define TARGET_RX_DECAP_MODE ATH10K_HW_TXRX_NATIVE_WIFI + #define TARGET_SCAN_MAX_PENDING_REQS 4 #define TARGET_BMISS_OFFLOAD_MAX_VDEV 3 #define TARGET_ROAM_OFFLOAD_MAX_VDEV 3