ath9k: General code scrub

Replace TRUE/FALSE macros with VALID/INVALID macros.
Follow a consistent variable convention.
Remove unnecessary comments.
Add all RC phy macros into a single enum.
Merge functions into reasonably sized entities.

Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath9k/ath9k.h

@@ -686,13 +686,19 @@ enum ath9k_ani_cmd {
 	ATH9K_ANI_ALL = 0xff
 };
 
-enum phytype {
-	PHY_DS,
-	PHY_FH,
-	PHY_OFDM,
-	PHY_HT,
+enum {
+	WLAN_RC_PHY_OFDM,
+	WLAN_RC_PHY_CCK,
+	WLAN_RC_PHY_HT_20_SS,
+	WLAN_RC_PHY_HT_20_DS,
+	WLAN_RC_PHY_HT_40_SS,
+	WLAN_RC_PHY_HT_40_DS,
+	WLAN_RC_PHY_HT_20_SS_HGI,
+	WLAN_RC_PHY_HT_20_DS_HGI,
+	WLAN_RC_PHY_HT_40_SS_HGI,
+	WLAN_RC_PHY_HT_40_DS_HGI,
+	WLAN_RC_PHY_MAX
 };
-#define PHY_CCK PHY_DS
 
 enum ath9k_tp_scale {
 	ATH9K_TP_SCALE_MAX = 0,

drivers/net/wireless/ath9k/hw.c

@@ -155,14 +155,14 @@ u16 ath9k_hw_computetxtime(struct ath_hal *ah,
 		return 0;
 
 	switch (rates->info[rateix].phy) {
-	case PHY_CCK:
+	case WLAN_RC_PHY_CCK:
 		phyTime = CCK_PREAMBLE_BITS + CCK_PLCP_BITS;
 		if (shortPreamble && rates->info[rateix].short_preamble)
 			phyTime >>= 1;
 		numBits = frameLen << 3;
 		txTime = CCK_SIFS_TIME + phyTime + ((numBits * 1000) / kbps);
 		break;
-	case PHY_OFDM:
+	case WLAN_RC_PHY_OFDM:
 		if (ah->ah_curchan && IS_CHAN_QUARTER_RATE(ah->ah_curchan)) {
 			bitsPerSymbol =	(kbps * OFDM_SYMBOL_TIME_QUARTER) / 1000;
 			numBits = OFDM_PLCP_BITS + (frameLen << 3);

drivers/net/wireless/ath9k/main.c

@@ -346,16 +346,15 @@ void ath_tx_complete(struct ath_softc *sc, struct sk_buff *skb,
 {
 	struct ieee80211_hw *hw = sc->hw;
 	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
+	struct ath_tx_info_priv *tx_info_priv = ATH_TX_INFO_PRIV(tx_info);
 
 	DPRINTF(sc, ATH_DBG_XMIT,
 		"%s: TX complete: skb: %p\n", __func__, skb);
 
 	if (tx_info->flags & IEEE80211_TX_CTL_NO_ACK ||
-		tx_info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
-		if (tx_info->rate_driver_data[0] != NULL) {
-			kfree(tx_info->rate_driver_data[0]);
-			tx_info->rate_driver_data[0] = NULL;
-		}
+	    tx_info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
+		kfree(tx_info_priv);
+		tx_info->rate_driver_data[0] = NULL;
 	}
 
 	if (tx_status->flags & ATH_TX_BAR) {

drivers/net/wireless/ath9k/rc.h

@@ -20,73 +20,19 @@
 #define RC_H
 
 #include "ath9k.h"
-/*
- * Interface definitions for transmit rate control modules for the
- * Atheros driver.
- *
- * A rate control module is responsible for choosing the transmit rate
- * for each data frame.  Management+control frames are always sent at
- * a fixed rate.
- *
- * Only one module may be present at a time; the driver references
- * rate control interfaces by symbol name.  If multiple modules are
- * to be supported we'll need to switch to a registration-based scheme
- * as is currently done, for example, for authentication modules.
- *
- * An instance of the rate control module is attached to each device
- * at attach time and detached when the device is destroyed.  The module
- * may associate data with each device and each node (station).  Both
- * sets of storage are opaque except for the size of the per-node storage
- * which must be provided when the module is attached.
- *
- * The rate control module is notified for each state transition and
- * station association/reassociation.  Otherwise it is queried for a
- * rate for each outgoing frame and provided status from each transmitted
- * frame.  Any ancillary processing is the responsibility of the module
- * (e.g. if periodic processing is required then the module should setup
- * it's own timer).
- *
- * In addition to the transmit rate for each frame the module must also
- * indicate the number of attempts to make at the specified rate.  If this
- * number is != ATH_TXMAXTRY then an additional callback is made to setup
- * additional transmit state.  The rate control code is assumed to write
- * this additional data directly to the transmit descriptor.
- */
 
 struct ath_softc;
 
-#define TRUE 1
-#define FALSE 0
-
-#define ATH_RATE_MAX	30
-
-#define WLAN_PHY_HT_20_SS       WLAN_RC_PHY_HT_20_SS
-#define WLAN_PHY_HT_20_DS       WLAN_RC_PHY_HT_20_DS
-#define WLAN_PHY_HT_20_DS_HGI   WLAN_RC_PHY_HT_20_DS_HGI
-#define WLAN_PHY_HT_40_SS       WLAN_RC_PHY_HT_40_SS
-#define WLAN_PHY_HT_40_SS_HGI   WLAN_RC_PHY_HT_40_SS_HGI
-#define WLAN_PHY_HT_40_DS       WLAN_RC_PHY_HT_40_DS
-#define WLAN_PHY_HT_40_DS_HGI   WLAN_RC_PHY_HT_40_DS_HGI
-
-#define WLAN_PHY_OFDM	PHY_OFDM
-#define WLAN_PHY_CCK	PHY_CCK
+#define ATH_RATE_MAX     30
+#define RATE_TABLE_SIZE  64
+#define MAX_TX_RATE_PHY  48
 
-#define TRUE_20		0x2
-#define TRUE_40		0x4
-#define TRUE_2040	(TRUE_20|TRUE_40)
-#define TRUE_ALL	(TRUE_2040|TRUE)
-
-enum {
-	WLAN_RC_PHY_HT_20_SS = 4,
-	WLAN_RC_PHY_HT_20_DS,
-	WLAN_RC_PHY_HT_40_SS,
-	WLAN_RC_PHY_HT_40_DS,
-	WLAN_RC_PHY_HT_20_SS_HGI,
-	WLAN_RC_PHY_HT_20_DS_HGI,
-	WLAN_RC_PHY_HT_40_SS_HGI,
-	WLAN_RC_PHY_HT_40_DS_HGI,
-	WLAN_RC_PHY_MAX
-};
+#define INVALID    0x0
+#define VALID      0x1
+#define VALID_20   0x2
+#define VALID_40   0x4
+#define VALID_2040 (VALID_20|VALID_40)
+#define VALID_ALL  (VALID_2040|VALID)
 
 #define WLAN_RC_PHY_DS(_phy)   ((_phy == WLAN_RC_PHY_HT_20_DS)		\
 				|| (_phy == WLAN_RC_PHY_HT_40_DS)	\
@@ -103,26 +49,22 @@ enum {
 
 #define WLAN_RC_PHY_HT(_phy)    (_phy >= WLAN_RC_PHY_HT_20_SS)
 
-/* Returns the capflag mode */
 #define WLAN_RC_CAP_MODE(capflag) (((capflag & WLAN_RC_HT_FLAG) ?	\
-		(capflag & WLAN_RC_40_FLAG) ? TRUE_40 : TRUE_20 : TRUE))
+		(capflag & WLAN_RC_40_FLAG) ? VALID_40 : VALID_20 : VALID))
 
 /* Return TRUE if flag supports HT20 && client supports HT20 or
  * return TRUE if flag supports HT40 && client supports HT40.
  * This is used becos some rates overlap between HT20/HT40.
  */
-
-#define WLAN_RC_PHY_HT_VALID(flag, capflag) (((flag & TRUE_20) && !(capflag \
-				& WLAN_RC_40_FLAG)) || ((flag & TRUE_40) && \
-				  (capflag & WLAN_RC_40_FLAG)))
+#define WLAN_RC_PHY_HT_VALID(flag, capflag)			\
+	(((flag & VALID_20) && !(capflag & WLAN_RC_40_FLAG)) || \
+	 ((flag & VALID_40) && (capflag & WLAN_RC_40_FLAG)))
 
 #define WLAN_RC_DS_FLAG         (0x01)
 #define WLAN_RC_40_FLAG         (0x02)
 #define WLAN_RC_SGI_FLAG        (0x04)
 #define WLAN_RC_HT_FLAG         (0x08)
 
-#define RATE_TABLE_SIZE		64
-
 /**
  * struct ath_rate_table - Rate Control table
  * @valid: valid for use in rate control
@@ -139,7 +81,7 @@ enum {
  * @max_4ms_framelen: maximum frame length(bytes) for tx duration
  * @probe_interval: interval for rate control to probe for other rates
  * @rssi_reduce_interval: interval for rate control to reduce rssi
- * @initial_ratemax: initial ratemax value used in ath_rc_sib_update()
+ * @initial_ratemax: initial ratemax value
  */
 struct ath_rate_table {
 	int rate_cnt;
@@ -169,15 +111,6 @@ struct ath_rate_table {
 	u8 initial_ratemax;
 };
 
-#define ATH_RC_PROBE_ALLOWED            0x00000001
-#define ATH_RC_MINRATE_LASTRATE         0x00000002
-
-/*
- * State structures for new rate adaptation code
- */
-#define	MAX_TX_RATE_TBL	        64
-#define MAX_TX_RATE_PHY         48
-
 struct ath_tx_ratectrl_state {
 	int8_t rssi_thres;	/* required rssi for this rate (dB) */
 	u8 per;			/* recent estimate of packet error rate (%) */
@@ -189,7 +122,7 @@ struct ath_rateset {
 };
 
 /**
- * struct ath_rate_node - Rate Control priv data
+ * struct ath_rate_priv - Rate Control priv data
  * @state: RC state
  * @rssi_last: last ACK rssi
  * @rssi_last_lookup: last ACK rssi used for lookup
@@ -214,9 +147,7 @@ struct ath_rateset {
  * @neg_rates: Negotatied rates
  * @neg_ht_rates: Negotiated HT rates
  */
-
-/* per-node state */
-struct ath_rate_node {
+struct ath_rate_priv {
 	int8_t rssi_last;
 	int8_t rssi_last_lookup;
 	int8_t rssi_last_prev;
@@ -228,11 +159,11 @@ struct ath_rate_node {
 	u8 probe_rate;
 	u8 hw_maxretry_pktcnt;
 	u8 max_valid_rate;
-	u8 valid_rate_index[MAX_TX_RATE_TBL];
+	u8 valid_rate_index[RATE_TABLE_SIZE];
 	u8 ht_cap;
 	u8 single_stream;
 	u8 valid_phy_ratecnt[WLAN_RC_PHY_MAX];
-	u8 valid_phy_rateidx[WLAN_RC_PHY_MAX][MAX_TX_RATE_TBL];
+	u8 valid_phy_rateidx[WLAN_RC_PHY_MAX][RATE_TABLE_SIZE];
 	u8 rc_phy_mode;
 	u8 rate_max_phy;
 	u32 rssi_time;
@@ -242,7 +173,7 @@ struct ath_rate_node {
 	u32 probe_interval;
 	u32 prev_data_rix;
 	u32 tx_triglevel_max;
-	struct ath_tx_ratectrl_state state[MAX_TX_RATE_TBL];
+	struct ath_tx_ratectrl_state state[RATE_TABLE_SIZE];
 	struct ath_rateset neg_rates;
 	struct ath_rateset neg_ht_rates;
 	struct ath_rate_softc *asc;
@@ -254,6 +185,9 @@ struct ath_tx_info_priv {
 	int n_bad_frames;
 };
 
+#define ATH_TX_INFO_PRIV(tx_info) \
+	((struct ath_tx_info_priv *)((tx_info)->rate_driver_data[0]))
+
 void ath_rate_attach(struct ath_softc *sc);
 u8 ath_rate_findrateix(struct ath_softc *sc, u8 dot11_rate);
 int ath_rate_control_register(void);

drivers/net/wireless/ath9k/xmit.c

@@ -536,7 +536,7 @@ static void ath_buf_set_rate(struct ath_softc *sc, struct ath_buf *bf)
 	 * just CTS.  Note that this is only done for OFDM/HT unicast frames.
 	 */
 	if (sc->sc_protmode != PROT_M_NONE && !(bf->bf_flags & ATH9K_TXDESC_NOACK)
-	    && (rt->info[rix].phy == WLAN_PHY_OFDM ||
+	    && (rt->info[rix].phy == WLAN_RC_PHY_OFDM ||
 		WLAN_RC_PHY_HT(rt->info[rix].phy))) {
 		if (sc->sc_protmode == PROT_M_RTSCTS)
 			flags = ATH9K_TXDESC_RTSENA;