staging: wfx: introduce wfx_set_default_unicast_key()

Currently code handle WEP keys manually. It is far easier to use
the set_default_unicast_key() callback provided by mac80211.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200420160311.57323-11-Jerome.Pouiller@silabs.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wfx/key.c

@@ -257,13 +257,3 @@ int wfx_upload_keys(struct wfx_vif *wvif)
 	return 0;
 }
 
-void wfx_wep_key_work(struct work_struct *work)
-{
-	struct wfx_vif *wvif = container_of(work, struct wfx_vif, wep_key_work);
-
-	wfx_tx_flush(wvif->wdev);
-	hif_wep_default_key_id(wvif, wvif->wep_default_key_id);
-	wfx_pending_requeue(wvif->wdev, wvif->wep_pending_skb);
-	wvif->wep_pending_skb = NULL;
-	wfx_tx_unlock(wvif->wdev);
-}

drivers/staging/wfx/key.h

@@ -17,6 +17,5 @@ int wfx_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 		struct ieee80211_vif *vif, struct ieee80211_sta *sta,
 		struct ieee80211_key_conf *key);
 int wfx_upload_keys(struct wfx_vif *wvif);
-void wfx_wep_key_work(struct work_struct *work);
 
 #endif /* WFX_STA_H */

drivers/staging/wfx/main.c

@@ -145,6 +145,7 @@ static const struct ieee80211_ops wfx_ops = {
 	.set_tim		= wfx_set_tim,
 	.set_key		= wfx_set_key,
 	.set_rts_threshold	= wfx_set_rts_threshold,
+	.set_default_unicast_key = wfx_set_default_unicast_key,
 	.bss_info_changed	= wfx_bss_info_changed,
 	.prepare_multicast	= wfx_prepare_multicast,
 	.configure_filter	= wfx_configure_filter,

drivers/staging/wfx/queue.c

@@ -254,36 +254,6 @@ bool wfx_tx_queues_has_cab(struct wfx_vif *wvif)
 	return false;
 }
 
-static bool wfx_handle_tx_data(struct wfx_dev *wdev, struct sk_buff *skb)
-{
-	struct hif_req_tx *req = wfx_skb_txreq(skb);
-	struct ieee80211_key_conf *hw_key = wfx_skb_tx_priv(skb)->hw_key;
-	struct ieee80211_hdr *frame =
-		(struct ieee80211_hdr *)(req->frame + req->data_flags.fc_offset);
-	struct wfx_vif *wvif =
-		wdev_to_wvif(wdev, ((struct hif_msg *)skb->data)->interface);
-
-	if (!wvif)
-		return false;
-
-	// FIXME: identify the exact scenario matched by this condition. Does it
-	// happen yet?
-	if (ieee80211_has_protected(frame->frame_control) &&
-	    hw_key && hw_key->keyidx != wvif->wep_default_key_id &&
-	    (hw_key->cipher == WLAN_CIPHER_SUITE_WEP40 ||
-	     hw_key->cipher == WLAN_CIPHER_SUITE_WEP104)) {
-		wfx_tx_lock(wdev);
-		WARN_ON(wvif->wep_pending_skb);
-		wvif->wep_default_key_id = hw_key->keyidx;
-		wvif->wep_pending_skb = skb;
-		if (!schedule_work(&wvif->wep_key_work))
-			wfx_tx_unlock(wdev);
-		return true;
-	} else {
-		return false;
-	}
-}
-
 static struct sk_buff *wfx_tx_queues_get_skb(struct wfx_dev *wdev)
 {
 	struct wfx_queue *sorted_queues[IEEE80211_NUM_ACS];
@@ -348,9 +318,6 @@ struct hif_msg *wfx_tx_queues_get(struct wfx_dev *wdev)
 			return NULL;
 		skb_queue_tail(&wdev->tx_pending, skb);
 		wake_up(&wdev->tx_dequeue);
-		// FIXME: is it useful?
-		if (wfx_handle_tx_data(wdev, skb))
-			continue;
 		tx_priv = wfx_skb_tx_priv(skb);
 		tx_priv->xmit_timestamp = ktime_get();
 		return (struct hif_msg *)skb->data;

drivers/staging/wfx/sta.c

@@ -275,6 +275,14 @@ static void wfx_beacon_loss_work(struct work_struct *work)
 			      msecs_to_jiffies(bss_conf->beacon_int));
 }
 
+void wfx_set_default_unicast_key(struct ieee80211_hw *hw,
+				 struct ieee80211_vif *vif, int idx)
+{
+	struct wfx_vif *wvif = (struct wfx_vif *)vif->drv_priv;
+
+	hif_wep_default_key_id(wvif, idx);
+}
+
 // Call it with wdev->conf_mutex locked
 static void wfx_do_unjoin(struct wfx_vif *wvif)
 {
@@ -560,13 +568,6 @@ void wfx_bss_info_changed(struct ieee80211_hw *hw,
 		wfx_filter_beacon(wvif, true);
 	}
 
-	/* assoc/disassoc, or maybe AID changed */
-	if (changed & BSS_CHANGED_ASSOC) {
-		wfx_tx_lock_flush(wdev);
-		wvif->wep_default_key_id = -1;
-		wfx_tx_unlock(wdev);
-	}
-
 	if (changed & BSS_CHANGED_ASSOC) {
 		if (info->assoc || info->ibss_joined)
 			wfx_join_finalize(wvif, info);
@@ -757,9 +758,6 @@ int wfx_add_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
 	INIT_WORK(&wvif->update_tim_work, wfx_update_tim_work);
 	INIT_DELAYED_WORK(&wvif->beacon_loss_work, wfx_beacon_loss_work);
 
-	wvif->wep_default_key_id = -1;
-	INIT_WORK(&wvif->wep_key_work, wfx_wep_key_work);
-
 	init_completion(&wvif->set_pm_mode_complete);
 	complete(&wvif->set_pm_mode_complete);
 	INIT_WORK(&wvif->tx_policy_upload_work, wfx_tx_policy_upload_work);

drivers/staging/wfx/sta.h

@@ -36,6 +36,8 @@ int wfx_start(struct ieee80211_hw *hw);
 void wfx_stop(struct ieee80211_hw *hw);
 int wfx_config(struct ieee80211_hw *hw, u32 changed);
 int wfx_set_rts_threshold(struct ieee80211_hw *hw, u32 value);
+void wfx_set_default_unicast_key(struct ieee80211_hw *hw,
+				 struct ieee80211_vif *vif, int idx);
 u64 wfx_prepare_multicast(struct ieee80211_hw *hw,
 			  struct netdev_hw_addr_list *mc_list);
 void wfx_configure_filter(struct ieee80211_hw *hw, unsigned int changed_flags,

drivers/staging/wfx/wfx.h

@@ -74,10 +74,6 @@ struct wfx_vif {
 	bool			after_dtim_tx_allowed;
 	struct delayed_work	beacon_loss_work;
 
-	s8			wep_default_key_id;
-	struct sk_buff		*wep_pending_skb;
-	struct work_struct	wep_key_work;
-
 	struct tx_policy_cache	tx_policy_cache;
 	struct work_struct	tx_policy_upload_work;