iwlwifi: control 11n capabilities through module param

This patch adds module param 11n_disable to allow configuration of 11n
capabilities. The default value of this param is 11n enabled (value 0).

Signed-off-by: Ron Rindjunsky <ron.rindjunsky@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-4965.c

@@ -2075,6 +2075,9 @@ int iwl4965_mac_ampdu_action(struct ieee80211_hw *hw,
 	IWL_DEBUG_HT("A-MPDU action on addr %s tid %d\n",
 		     print_mac(mac, addr), tid);
 
+	if (!(priv->cfg->sku & IWL_SKU_N))
+		return -EACCES;
+
 	switch (action) {
 	case IEEE80211_AMPDU_RX_START:
 		IWL_DEBUG_HT("start Rx\n");
@@ -2457,11 +2460,14 @@ MODULE_PARM_DESC(disable_hw_scan, "disable hardware scanning (default 0)");
 
 module_param_named(queues_num, iwl4965_mod_params.num_of_queues, int, 0444);
 MODULE_PARM_DESC(queues_num, "number of hw queues.");
-
 /* QoS */
 module_param_named(qos_enable, iwl4965_mod_params.enable_qos, int, 0444);
 MODULE_PARM_DESC(qos_enable, "enable all QoS functionality");
+/* 11n */
+module_param_named(11n_disable, iwl4965_mod_params.disable_11n, int, 0444);
+MODULE_PARM_DESC(11n_disable, "disable 11n functionality");
 module_param_named(amsdu_size_8K, iwl4965_mod_params.amsdu_size_8K, int, 0444);
 MODULE_PARM_DESC(amsdu_size_8K, "enable 8K amsdu size");
+
 module_param_named(fw_restart4965, iwl4965_mod_params.restart_fw, int, 0444);
 MODULE_PARM_DESC(fw_restart4965, "restart firmware in case of error");

drivers/net/wireless/iwlwifi/iwl-5000.c

@@ -1540,6 +1540,8 @@ module_param_named(queues_num50, iwl50_mod_params.num_of_queues, int, 0444);
 MODULE_PARM_DESC(queues_num50, "number of hw queues in 50xx series");
 module_param_named(qos_enable50, iwl50_mod_params.enable_qos, int, 0444);
 MODULE_PARM_DESC(qos_enable50, "enable all 50XX QoS functionality");
+module_param_named(11n_disable50, iwl50_mod_params.disable_11n, int, 0444);
+MODULE_PARM_DESC(11n_disable50, "disable 50XX 11n functionality");
 module_param_named(amsdu_size_8K50, iwl50_mod_params.amsdu_size_8K, int, 0444);
 MODULE_PARM_DESC(amsdu_size_8K50, "enable 8K amsdu size in 50XX series");
 module_param_named(fw_restart50, iwl50_mod_params.restart_fw, int, 0444);

drivers/net/wireless/iwlwifi/iwl-core.c

@@ -495,7 +495,9 @@ static int iwlcore_init_geos(struct iwl_priv *priv)
 	sband->bitrates = &rates[IWL_FIRST_OFDM_RATE];
 	sband->n_bitrates = IWL_RATE_COUNT - IWL_FIRST_OFDM_RATE;
 
-	iwlcore_init_ht_hw_capab(priv, &sband->ht_info, IEEE80211_BAND_5GHZ);
+	if (priv->cfg->sku & IWL_SKU_N)
+		iwlcore_init_ht_hw_capab(priv, &sband->ht_info,
+					 IEEE80211_BAND_5GHZ);
 
 	sband = &priv->bands[IEEE80211_BAND_2GHZ];
 	sband->channels = channels;
@@ -503,7 +505,9 @@ static int iwlcore_init_geos(struct iwl_priv *priv)
 	sband->bitrates = rates;
 	sband->n_bitrates = IWL_RATE_COUNT;
 
-	iwlcore_init_ht_hw_capab(priv, &sband->ht_info, IEEE80211_BAND_2GHZ);
+	if (priv->cfg->sku & IWL_SKU_N)
+		iwlcore_init_ht_hw_capab(priv, &sband->ht_info,
+					 IEEE80211_BAND_2GHZ);
 
 	priv->ieee_channels = channels;
 	priv->ieee_rates = rates;
@@ -819,8 +823,9 @@ int iwl_setup_mac(struct iwl_priv *priv)
 		    IEEE80211_HW_NOISE_DBM;
 	/* Default value; 4 EDCA QOS priorities */
 	hw->queues = 4;
-	/* Enhanced value; more queues, to support 11n aggregation */
-	hw->ampdu_queues = 12;
+	/* queues to support 11n aggregation */
+	if (priv->cfg->sku & IWL_SKU_N)
+		hw->ampdu_queues = 12;
 
 	hw->conf.beacon_int = 100;
 
@@ -853,6 +858,9 @@ int iwl_set_hw_params(struct iwl_priv *priv)
 		priv->hw_params.rx_buf_size = IWL_RX_BUF_SIZE_4K;
 	priv->hw_params.max_pkt_size = priv->hw_params.rx_buf_size - 256;
 
+	if (priv->cfg->mod_params->disable_11n)
+		priv->cfg->sku &= ~IWL_SKU_N;
+
 	/* Device-specific setup */
 	return priv->cfg->ops->lib->set_hw_params(priv);
 }

drivers/net/wireless/iwlwifi/iwl-core.h

@@ -159,6 +159,7 @@ struct iwl_mod_params {
 	int disable_hw_scan;	/* def: 0 = use h/w scan */
 	int num_of_queues;	/* def: HW dependent */
 	int enable_qos;		/* def: 1 = use quality of service */
+	int disable_11n;	/* def: 0 = disable 11n capabilities */
 	int amsdu_size_8K;	/* def: 1 = enable 8K amsdu size */
 	int antenna;  		/* def: 0 = both antennas (use diversity) */
 	int restart_fw;		/* def: 1 = restart firmware */