mwifiex: channel switch support for mwifiex

This patch adds cfg80211 channel_switch support for mwifiex.
Upon receiving channel switch request, driver would parse channel
switch announcement IE from beacon_data.
If TX is blocked, netdev queues are stopped. IEs from csa_beacon
are then parsed and set to FW.

Signed-off-by: Avinash Patil <patila@marvell.com>
Signed-off-by: Qingshui Gao <gaoqs@marvell.com>
Signed-off-by: Cathy Luo <cluo@marvell.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

4 files changed, 136 insertions, 3 deletions

diff --git a/drivers/net/wireless/mwifiex/11h.c b/drivers/net/wireless/mwifiex/11h.c
index 08c12aece9ae..d794686e31d6 100644
--- a/drivers/net/wireless/mwifiex/11h.c
+++ b/drivers/net/wireless/mwifiex/11h.c
@@ -240,3 +240,40 @@ int mwifiex_11h_handle_radar_detected(struct mwifiex_private *priv,
 
         return 0;
 }
+
+/* This is work queue function for channel switch handling.
+ * This function takes care of updating new channel definitin to
+ * bss config structure, restart AP and indicate channel switch success
+ * to cfg80211.
+ */
+void mwifiex_dfs_chan_sw_work_queue(struct work_struct *work)
+{
+        struct mwifiex_uap_bss_param *bss_cfg;
+        struct delayed_work *delayed_work =
+                        container_of(work, struct delayed_work, work);
+        struct mwifiex_private *priv =
+                        container_of(delayed_work, struct mwifiex_private,
+                                     dfs_chan_sw_work);
+
+        if (WARN_ON(!priv))
+                return;
+
+        bss_cfg = &priv->bss_cfg;
+        if (!bss_cfg->beacon_period) {
+                dev_err(priv->adapter->dev,
+                        "channel switch: AP already stopped\n");
+                return;
+        }
+
+        mwifiex_uap_set_channel(bss_cfg, priv->dfs_chandef);
+
+        if (mwifiex_config_start_uap(priv, bss_cfg)) {
+                dev_dbg(priv->adapter->dev,
+                        "Failed to start AP after channel switch\n");
+                return;
+        }
+
+        dev_notice(priv->adapter->dev,
+                   "indicating channel switch completion to kernel\n");
+        cfg80211_ch_switch_notify(priv->netdev, &priv->dfs_chandef);
+}
diff --git a/drivers/net/wireless/mwifiex/cfg80211.c b/drivers/net/wireless/mwifiex/cfg80211.c
index 7a969fd2f0cd..2d1ea938e08e 100644
--- a/drivers/net/wireless/mwifiex/cfg80211.c
+++ b/drivers/net/wireless/mwifiex/cfg80211.c
@@ -2399,7 +2399,7 @@ struct wireless_dev *mwifiex_add_virtual_intf(struct wiphy *wiphy,
         struct mwifiex_private *priv;
         struct net_device *dev;
         void *mdev_priv;
-        char dfs_cac_str[MWIFIEX_MAX_WQ_LEN];
+        char dfs_cac_str[MWIFIEX_MAX_WQ_LEN], dfs_chsw_str[MWIFIEX_MAX_WQ_LEN];
 
         if (!adapter)
                 return ERR_PTR(-EFAULT);
@@ -2582,6 +2582,24 @@ struct wireless_dev *mwifiex_add_virtual_intf(struct wiphy *wiphy,
 
         INIT_DELAYED_WORK(&priv->dfs_cac_work, mwifiex_dfs_cac_work_queue);
 
+        strcpy(dfs_chsw_str, "MWIFIEX_DFS_CHSW");
+        strcat(dfs_chsw_str, name);
+        priv->dfs_chan_sw_workqueue = alloc_workqueue(dfs_chsw_str,
+                                                      WQ_HIGHPRI | WQ_UNBOUND |
+                                                      WQ_MEM_RECLAIM, 1);
+        if (!priv->dfs_chan_sw_workqueue) {
+                wiphy_err(wiphy, "cannot register virtual network device\n");
+                free_netdev(dev);
+                priv->bss_mode = NL80211_IFTYPE_UNSPECIFIED;
+                priv->netdev = NULL;
+                memset(&priv->wdev, 0, sizeof(priv->wdev));
+                priv->wdev.iftype = NL80211_IFTYPE_UNSPECIFIED;
+                return ERR_PTR(-ENOMEM);
+        }
+
+        INIT_DELAYED_WORK(&priv->dfs_chan_sw_work,
+                          mwifiex_dfs_chan_sw_work_queue);
+
         sema_init(&priv->async_sem, 1);
 
         dev_dbg(adapter->dev, "info: %s: Marvell 802.11 Adapter\n", dev->name);
@@ -2637,6 +2655,11 @@ int mwifiex_del_virtual_intf(struct wiphy *wiphy, struct wireless_dev *wdev)
                 priv->dfs_cac_workqueue = NULL;
         }
 
+        if (priv->dfs_chan_sw_workqueue) {
+                flush_workqueue(priv->dfs_chan_sw_workqueue);
+                destroy_workqueue(priv->dfs_chan_sw_workqueue);
+                priv->dfs_chan_sw_workqueue = NULL;
+        }
         /* Clear the priv in adapter */
         priv->netdev->ieee80211_ptr = NULL;
         priv->netdev = NULL;
@@ -3116,6 +3139,62 @@ mwifiex_cfg80211_add_station(struct wiphy *wiphy, struct net_device *dev,
 }
 
 static int
+mwifiex_cfg80211_channel_switch(struct wiphy *wiphy, struct net_device *dev,
+                                struct cfg80211_csa_settings *params)
+{
+        struct ieee_types_header *chsw_ie;
+        struct ieee80211_channel_sw_ie *channel_sw;
+        int chsw_msec;
+        struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
+
+        if (priv->adapter->scan_processing) {
+                dev_err(priv->adapter->dev,
+                        "radar detection: scan in process...\n");
+                return -EBUSY;
+        }
+
+        if (priv->wdev.cac_started)
+                return -EBUSY;
+
+        if (cfg80211_chandef_identical(&params->chandef,
+                                       &priv->dfs_chandef))
+                return -EINVAL;
+
+        chsw_ie = (void *)cfg80211_find_ie(WLAN_EID_CHANNEL_SWITCH,
+                                           params->beacon_csa.tail,
+                                           params->beacon_csa.tail_len);
+        if (!chsw_ie) {
+                dev_err(priv->adapter->dev,
+                        "Could not parse channel switch announcement IE\n");
+                return -EINVAL;
+        }
+
+        channel_sw = (void *)(chsw_ie + 1);
+        if (channel_sw->mode) {
+                if (netif_carrier_ok(priv->netdev))
+                        netif_carrier_off(priv->netdev);
+                mwifiex_stop_net_dev_queue(priv->netdev, priv->adapter);
+        }
+
+        if (mwifiex_del_mgmt_ies(priv))
+                wiphy_err(wiphy, "Failed to delete mgmt IEs!\n");
+
+        if (mwifiex_set_mgmt_ies(priv, &params->beacon_csa)) {
+                wiphy_err(wiphy, "%s: setting mgmt ies failed\n", __func__);
+                return -EFAULT;
+        }
+
+        memcpy(&priv->dfs_chandef, &params->chandef, sizeof(priv->dfs_chandef));
+        memcpy(&priv->beacon_after, &params->beacon_after,
+               sizeof(priv->beacon_after));
+
+        chsw_msec = max(channel_sw->count * priv->bss_cfg.beacon_period, 100);
+        queue_delayed_work(priv->dfs_chan_sw_workqueue, &priv->dfs_chan_sw_work,
+                           msecs_to_jiffies(chsw_msec));
+        return 0;
+}
+
+static int
 mwifiex_cfg80211_start_radar_detection(struct wiphy *wiphy,
                                        struct net_device *dev,
                                        struct cfg80211_chan_def *chandef,
@@ -3210,6 +3289,7 @@ static struct cfg80211_ops mwifiex_cfg80211_ops = {
         .add_station = mwifiex_cfg80211_add_station,
         .change_station = mwifiex_cfg80211_change_station,
         .start_radar_detection = mwifiex_cfg80211_start_radar_detection,
+        .channel_switch = mwifiex_cfg80211_channel_switch,
 };
 
 #ifdef CONFIG_PM
@@ -3313,7 +3393,8 @@ int mwifiex_register_cfg80211(struct mwifiex_adapter *adapter)
         wiphy->flags |= WIPHY_FLAG_HAVE_AP_SME |
                         WIPHY_FLAG_AP_PROBE_RESP_OFFLOAD |
                         WIPHY_FLAG_AP_UAPSD |
-                        WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
+                        WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL |
+                        WIPHY_FLAG_HAS_CHANNEL_SWITCH;
 
         if (ISSUPP_TDLS_ENABLED(adapter->fw_cap_info))
                 wiphy->flags |= WIPHY_FLAG_SUPPORTS_TDLS |
diff --git a/drivers/net/wireless/mwifiex/ie.c b/drivers/net/wireless/mwifiex/ie.c
index a6af7b88bf05..f3b6ed249403 100644
--- a/drivers/net/wireless/mwifiex/ie.c
+++ b/drivers/net/wireless/mwifiex/ie.c
@@ -325,6 +325,7 @@ static int mwifiex_uap_set_head_tail_ies(struct mwifiex_private *priv,
 {
         struct mwifiex_ie *gen_ie;
         struct ieee_types_header *rsn_ie = NULL, *wpa_ie = NULL;
+        struct ieee_types_header *chsw_ie = NULL;
         u16 gen_idx = MWIFIEX_AUTO_IDX_MASK, ie_len = 0;
         const u8 *vendor_ie;
 
@@ -356,9 +357,18 @@ static int mwifiex_uap_set_head_tail_ies(struct mwifiex_private *priv,
                         ie_len += wpa_ie->len + 2;
                         gen_ie->ie_length = cpu_to_le16(ie_len);
                 }
+
+                chsw_ie = (void *)cfg80211_find_ie(WLAN_EID_CHANNEL_SWITCH,
+                                                   info->tail, info->tail_len);
+                if (chsw_ie) {
+                        memcpy(gen_ie->ie_buffer + ie_len,
+                               chsw_ie, chsw_ie->len + 2);
+                        ie_len += chsw_ie->len + 2;
+                        gen_ie->ie_length = cpu_to_le16(ie_len);
+                }
         }
 
-        if (rsn_ie || wpa_ie) {
+        if (rsn_ie || wpa_ie || chsw_ie) {
                 if (mwifiex_update_uap_custom_ie(priv, gen_ie, &gen_idx, NULL,
                                                  NULL, NULL, NULL)) {
                         kfree(gen_ie);
diff --git a/drivers/net/wireless/mwifiex/main.h b/drivers/net/wireless/mwifiex/main.h
index ad9d679c3eed..599698c6b627 100644
--- a/drivers/net/wireless/mwifiex/main.h
+++ b/drivers/net/wireless/mwifiex/main.h
@@ -591,6 +591,10 @@ struct mwifiex_private {
         struct cfg80211_chan_def dfs_chandef;
         struct workqueue_struct *dfs_cac_workqueue;
         struct delayed_work dfs_cac_work;
+        struct timer_list dfs_chan_switch_timer;
+        struct workqueue_struct *dfs_chan_sw_workqueue;
+        struct delayed_work dfs_chan_sw_work;
+        struct cfg80211_beacon_data beacon_after;
 };
 
 enum mwifiex_ba_status {
@@ -1394,6 +1398,7 @@ struct sk_buff *
 mwifiex_clone_skb_for_tx_status(struct mwifiex_private *priv,
                                 struct sk_buff *skb, u8 flag, u64 *cookie);
 void mwifiex_dfs_cac_work_queue(struct work_struct *work);
+void mwifiex_dfs_chan_sw_work_queue(struct work_struct *work);
 void mwifiex_abort_cac(struct mwifiex_private *priv);
 int mwifiex_11h_handle_radar_detected(struct mwifiex_private *priv,
                                       struct sk_buff *skb);