wl1251: enable tx path in monitor mode if necessary for packet injection

If necessary enable the tx path in monitor mode for packet injection using
the JOIN command with BSS_TYPE_STA_BSS and zero BSSID.
Signed-off-by: David Gnedt <david.gnedt@davizone.at>
Signed-off-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ti/wl1251/main.c

@@ -486,6 +486,7 @@ static void wl1251_op_stop(struct ieee80211_hw *hw)
 	wl->rssi_thold = 0;
 	wl->channel = WL1251_DEFAULT_CHANNEL;
 	wl->monitor_present = false;
+	wl->joined = false;
 
 	wl1251_debugfs_reset(wl);
 
@@ -545,6 +546,7 @@ static void wl1251_op_remove_interface(struct ieee80211_hw *hw,
 	mutex_lock(&wl->mutex);
 	wl1251_debug(DEBUG_MAC80211, "mac80211 remove interface");
 	wl->vif = NULL;
+	memset(wl->bssid, 0, ETH_ALEN);
 	mutex_unlock(&wl->mutex);
 }
 
@@ -623,6 +625,7 @@ static int wl1251_op_config(struct ieee80211_hw *hw, u32 changed)
 		 * at firmware level.
 		 */
 		if (wl->vif == NULL) {
+			wl->joined = false;
 			ret = wl1251_cmd_data_path_rx(wl, wl->channel, 1);
 		} else {
 			ret = wl1251_join(wl, wl->bss_type, wl->channel,
@@ -1507,7 +1510,9 @@ struct ieee80211_hw *wl1251_alloc_hw(void)
 	INIT_DELAYED_WORK(&wl->elp_work, wl1251_elp_work);
 	wl->channel = WL1251_DEFAULT_CHANNEL;
 	wl->monitor_present = false;
+	wl->joined = false;
 	wl->scanning = false;
+	wl->bss_type = MAX_BSS_TYPE;
 	wl->default_key = 0;
 	wl->listen_int = 1;
 	wl->rx_counter = 0;

drivers/net/wireless/ti/wl1251/tx.c

@@ -28,6 +28,7 @@
 #include "tx.h"
 #include "ps.h"
 #include "io.h"
+#include "event.h"
 
 static bool wl1251_tx_double_buffer_busy(struct wl1251 *wl, u32 data_out_count)
 {
@@ -277,6 +278,26 @@ static void wl1251_tx_trigger(struct wl1251 *wl)
 		TX_STATUS_DATA_OUT_COUNT_MASK;
 }
 
+static void enable_tx_for_packet_injection(struct wl1251 *wl)
+{
+	int ret;
+
+	ret = wl1251_cmd_join(wl, BSS_TYPE_STA_BSS, wl->channel,
+			      wl->beacon_int, wl->dtim_period);
+	if (ret < 0) {
+		wl1251_warning("join failed");
+		return;
+	}
+
+	ret = wl1251_event_wait(wl, JOIN_EVENT_COMPLETE_ID, 100);
+	if (ret < 0) {
+		wl1251_warning("join timeout");
+		return;
+	}
+
+	wl->joined = true;
+}
+
 /* caller must hold wl->mutex */
 static int wl1251_tx_frame(struct wl1251 *wl, struct sk_buff *skb)
 {
@@ -298,6 +319,10 @@ static int wl1251_tx_frame(struct wl1251 *wl, struct sk_buff *skb)
 		}
 	}
 
+	/* Enable tx path in monitor mode for packet injection */
+	if ((wl->vif == NULL) && !wl->joined)
+		enable_tx_for_packet_injection(wl);
+
 	ret = wl1251_tx_path_status(wl);
 	if (ret < 0)
 		return ret;

drivers/net/wireless/ti/wl1251/wl1251.h

@@ -305,6 +305,7 @@ struct wl1251 {
 	u8 listen_int;
 	int channel;
 	bool monitor_present;
+	bool joined;
 
 	void *target_mem_map;
 	struct acx_data_path_params_resp *data_path;