iwlwifi: support channel switch offload in driver

Support channel switch in driver as a separated mac80211 callback
function instead of part of mac_config callback; by moving to this
approach, uCode can have more control of channel switch timing.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>

1 files changed, 94 insertions, 1 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index 021b01494a2a..9c85e1bd2971 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -120,7 +120,7 @@ int iwl_commit_rxon(struct iwl_priv *priv)
 	    (priv->switch_rxon.channel != priv->staging_rxon.channel)) {
 		IWL_DEBUG_11H(priv, "abort channel switch on %d\n",
 		      le16_to_cpu(priv->switch_rxon.channel));
-		priv->switch_rxon.switch_in_progress = false;
+		iwl_chswitch_done(priv, false);
 	}
 
 	/* If we don't need to send a full RXON, we can use
@@ -3325,6 +3325,98 @@ static int iwlagn_mac_sta_add(struct ieee80211_hw *hw,
 	return 0;
 }
 
+static void iwl_mac_channel_switch(struct ieee80211_hw *hw,
+				   struct ieee80211_channel_switch *ch_switch)
+{
+	struct iwl_priv *priv = hw->priv;
+	const struct iwl_channel_info *ch_info;
+	struct ieee80211_conf *conf = &hw->conf;
+	struct iwl_ht_config *ht_conf = &priv->current_ht_config;
+	u16 ch;
+	unsigned long flags = 0;
+
+	IWL_DEBUG_MAC80211(priv, "enter\n");
+
+	if (iwl_is_rfkill(priv))
+		goto out_exit;
+
+	if (test_bit(STATUS_EXIT_PENDING, &priv->status) ||
+	    test_bit(STATUS_SCANNING, &priv->status))
+		goto out_exit;
+
+	if (!iwl_is_associated(priv))
+		goto out_exit;
+
+	/* channel switch in progress */
+	if (priv->switch_rxon.switch_in_progress == true)
+		goto out_exit;
+
+	mutex_lock(&priv->mutex);
+	if (priv->cfg->ops->lib->set_channel_switch) {
+
+		ch = ieee80211_frequency_to_channel(
+			ch_switch->channel->center_freq);
+		if (le16_to_cpu(priv->active_rxon.channel) != ch) {
+			ch_info = iwl_get_channel_info(priv,
+						       conf->channel->band,
+						       ch);
+			if (!is_channel_valid(ch_info)) {
+				IWL_DEBUG_MAC80211(priv, "invalid channel\n");
+				goto out;
+			}
+			spin_lock_irqsave(&priv->lock, flags);
+
+			priv->current_ht_config.smps = conf->smps_mode;
+
+			/* Configure HT40 channels */
+			ht_conf->is_ht = conf_is_ht(conf);
+			if (ht_conf->is_ht) {
+				if (conf_is_ht40_minus(conf)) {
+					ht_conf->extension_chan_offset =
+						IEEE80211_HT_PARAM_CHA_SEC_BELOW;
+					ht_conf->is_40mhz = true;
+				} else if (conf_is_ht40_plus(conf)) {
+					ht_conf->extension_chan_offset =
+						IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
+					ht_conf->is_40mhz = true;
+				} else {
+					ht_conf->extension_chan_offset =
+						IEEE80211_HT_PARAM_CHA_SEC_NONE;
+					ht_conf->is_40mhz = false;
+				}
+			} else
+				ht_conf->is_40mhz = false;
+
+			/* if we are switching from ht to 2.4 clear flags
+			 * from any ht related info since 2.4 does not
+			 * support ht */
+			if ((le16_to_cpu(priv->staging_rxon.channel) != ch))
+				priv->staging_rxon.flags = 0;
+
+			iwl_set_rxon_channel(priv, conf->channel);
+			iwl_set_rxon_ht(priv, ht_conf);
+			iwl_set_flags_for_band(priv, conf->channel->band,
+					       priv->vif);
+			spin_unlock_irqrestore(&priv->lock, flags);
+
+			iwl_set_rate(priv);
+			/*
+			 * at this point, staging_rxon has the
+			 * configuration for channel switch
+			 */
+			if (priv->cfg->ops->lib->set_channel_switch(priv,
+								    ch_switch))
+				priv->switch_rxon.switch_in_progress = false;
+		}
+	}
+out:
+	mutex_unlock(&priv->mutex);
+out_exit:
+	if (!priv->switch_rxon.switch_in_progress)
+		ieee80211_chswitch_done(priv->vif, false);
+	IWL_DEBUG_MAC80211(priv, "leave\n");
+}
+
 /*****************************************************************************
  *
  * sysfs attributes
@@ -3646,6 +3738,7 @@ static struct ieee80211_ops iwl_hw_ops = {
 	.sta_notify = iwl_mac_sta_notify,
 	.sta_add = iwlagn_mac_sta_add,
 	.sta_remove = iwl_mac_sta_remove,
+	.channel_switch = iwl_mac_channel_switch,
 };
 
 static int iwl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)