rsi: add rx control block to handle rx packets in USB

Rx bluetooth endpoint shall be added in further patches. Rx control
block is introduced here to handle Rx packets properly. Separate
function is written to initialize the RX control blocks.

Signed-off-by: Prameela Rani Garnepudi <prameela.j04cs@gmail.com>
Signed-off-by: Siva Rebbagondla <siva.rebbagondla@redpinesignals.com>
Signed-off-by: Amitkumar Karwar <amit.karwar@redpinesignals.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/rsi/rsi_91x_main.c

@@ -137,7 +137,7 @@ static struct sk_buff *rsi_prepare_skb(struct rsi_common *common,
  *
  * Return: 0 on success, -1 on failure.
  */
-int rsi_read_pkt(struct rsi_common *common, s32 rcv_pkt_len)
+int rsi_read_pkt(struct rsi_common *common, u8 *rx_pkt, s32 rcv_pkt_len)
 {
 	u8 *frame_desc = NULL, extended_desc = 0;
 	u32 index, length = 0, queueno = 0;
@@ -146,7 +146,7 @@ int rsi_read_pkt(struct rsi_common *common, s32 rcv_pkt_len)
 
 	index = 0;
 	do {
-		frame_desc = &common->rx_data_pkt[index];
+		frame_desc = &rx_pkt[index];
 		actual_length = *(u16 *)&frame_desc[0];
 		offset = *(u16 *)&frame_desc[2];
 

drivers/net/wireless/rsi/rsi_91x_sdio_ops.c

@@ -118,7 +118,7 @@ static int rsi_process_pkt(struct rsi_common *common)
 		goto fail;
 	}
 
-	status = rsi_read_pkt(common, rcv_pkt_len);
+	status = rsi_read_pkt(common, common->rx_data_pkt, rcv_pkt_len);
 
 fail:
 	kfree(common->rx_data_pkt);

drivers/net/wireless/rsi/rsi_91x_usb.c

@@ -247,12 +247,13 @@ static int rsi_usb_reg_write(struct usb_device *usbdev,
  */
 static void rsi_rx_done_handler(struct urb *urb)
 {
-	struct rsi_hw *adapter = urb->context;
-	struct rsi_91x_usbdev *dev = (struct rsi_91x_usbdev *)adapter->rsi_dev;
+	struct rx_usb_ctrl_block *rx_cb = urb->context;
+	struct rsi_91x_usbdev *dev = (struct rsi_91x_usbdev *)rx_cb->data;
 
 	if (urb->status)
 		return;
 
+	rx_cb->pend = 1;
 	rsi_set_event(&dev->rx_thread.event);
 }
 
@@ -262,10 +263,11 @@ static void rsi_rx_done_handler(struct urb *urb)
  *
  * Return: 0 on success, a negative error code on failure.
  */
-static int rsi_rx_urb_submit(struct rsi_hw *adapter)
+static int rsi_rx_urb_submit(struct rsi_hw *adapter, u8 ep_num)
 {
 	struct rsi_91x_usbdev *dev = (struct rsi_91x_usbdev *)adapter->rsi_dev;
-	struct urb *urb = dev->rx_usb_urb[0];
+	struct rx_usb_ctrl_block *rx_cb = &dev->rx_cb[ep_num - 1];
+	struct urb *urb = rx_cb->rx_urb;
 	int status;
 
 	usb_fill_bulk_urb(urb,
@@ -275,7 +277,7 @@ static int rsi_rx_urb_submit(struct rsi_hw *adapter)
 			  urb->transfer_buffer,
 			  3000,
 			  rsi_rx_done_handler,
-			  adapter);
+			  rx_cb);
 
 	status = usb_submit_urb(urb, GFP_KERNEL);
 	if (status)
@@ -484,14 +486,54 @@ static struct rsi_host_intf_ops usb_host_intf_ops = {
  */
 static void rsi_deinit_usb_interface(struct rsi_hw *adapter)
 {
+	u8 idx;
+
 	struct rsi_91x_usbdev *dev = (struct rsi_91x_usbdev *)adapter->rsi_dev;
 
 	rsi_kill_thread(&dev->rx_thread);
-	usb_free_urb(dev->rx_usb_urb[0]);
+
+	for (idx = 0; idx < MAX_RX_URBS; idx++) {
+		usb_free_urb(dev->rx_cb[idx].rx_urb);
+		kfree(dev->rx_cb[idx].rx_buffer);
+	}
+
 	kfree(adapter->priv->rx_data_pkt);
 	kfree(dev->tx_buffer);
 }
 
+static int rsi_usb_init_rx(struct rsi_hw *adapter)
+{
+	struct rsi_91x_usbdev *dev = (struct rsi_91x_usbdev *)adapter->rsi_dev;
+	struct rx_usb_ctrl_block *rx_cb;
+	u8 idx;
+
+	for (idx = 0; idx < MAX_RX_URBS; idx++) {
+		rx_cb = &dev->rx_cb[idx];
+
+		rx_cb->rx_buffer = kzalloc(RSI_USB_BUF_SIZE * 2,
+					   GFP_KERNEL);
+		if (!rx_cb->rx_buffer)
+			goto err;
+
+		rx_cb->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
+		if (!rx_cb->rx_urb) {
+			rsi_dbg(ERR_ZONE, "Failed alloc rx urb[%d]\n", idx);
+			goto err;
+		}
+		rx_cb->rx_urb->transfer_buffer = rx_cb->rx_buffer;
+		rx_cb->ep_num = idx + 1;
+		rx_cb->data = (void *)dev;
+	}
+	return 0;
+
+err:
+	for (idx = 0; idx < MAX_RX_URBS; idx++) {
+		kfree(dev->rx_cb[idx].rx_buffer);
+		kfree(dev->rx_cb[idx].rx_urb);
+	}
+	return -1;
+}
+
 /**
  * rsi_init_usb_interface() - This function initializes the usb interface.
  * @adapter: Pointer to the adapter structure.
@@ -504,7 +546,7 @@ static int rsi_init_usb_interface(struct rsi_hw *adapter,
 {
 	struct rsi_91x_usbdev *rsi_dev;
 	struct rsi_common *common = adapter->priv;
-	int status;
+	int status, i;
 
 	rsi_dev = kzalloc(sizeof(*rsi_dev), GFP_KERNEL);
 	if (!rsi_dev)
@@ -531,12 +573,12 @@ static int rsi_init_usb_interface(struct rsi_hw *adapter,
 		status = -ENOMEM;
 		goto fail_tx;
 	}
-	rsi_dev->rx_usb_urb[0] = usb_alloc_urb(0, GFP_KERNEL);
-	if (!rsi_dev->rx_usb_urb[0]) {
-		status = -ENOMEM;
-		goto fail_rx;
+
+	if (rsi_usb_init_rx(adapter)) {
+		rsi_dbg(ERR_ZONE, "Failed to init RX handle\n");
+		return -ENOMEM;
 	}
-	rsi_dev->rx_usb_urb[0]->transfer_buffer = adapter->priv->rx_data_pkt;
+
 	rsi_dev->tx_blk_size = 252;
 	adapter->block_size = rsi_dev->tx_blk_size;
 
@@ -564,9 +606,10 @@ static int rsi_init_usb_interface(struct rsi_hw *adapter,
 	return 0;
 
 fail_thread:
-	usb_free_urb(rsi_dev->rx_usb_urb[0]);
-fail_rx:
-	kfree(rsi_dev->tx_buffer);
+	for (i = 0; i < MAX_RX_URBS; i++) {
+		kfree(rsi_dev->rx_cb[i].rx_buffer);
+		kfree(rsi_dev->rx_cb[i].rx_urb);
+	}
 fail_tx:
 	kfree(common->rx_data_pkt);
 	return status;
@@ -698,7 +741,7 @@ static int rsi_probe(struct usb_interface *pfunction,
 		rsi_dbg(INIT_ZONE, "%s: Device Init Done\n", __func__);
 	}
 
-	status = rsi_rx_urb_submit(adapter);
+	status = rsi_rx_urb_submit(adapter, WLAN_EP);
 	if (status)
 		goto err1;
 

drivers/net/wireless/rsi/rsi_91x_usb_ops.c

@@ -29,28 +29,39 @@ void rsi_usb_rx_thread(struct rsi_common *common)
 {
 	struct rsi_hw *adapter = common->priv;
 	struct rsi_91x_usbdev *dev = (struct rsi_91x_usbdev *)adapter->rsi_dev;
-	int status;
+	struct rx_usb_ctrl_block *rx_cb;
+	int status, idx;
 
 	do {
 		rsi_wait_event(&dev->rx_thread.event, EVENT_WAIT_FOREVER);
 
 		if (atomic_read(&dev->rx_thread.thread_done))
 			goto out;
 
-		mutex_lock(&common->rx_lock);
-		status = rsi_read_pkt(common, 0);
-		if (status) {
-			rsi_dbg(ERR_ZONE, "%s: Failed To read data", __func__);
+		for (idx = 0; idx < MAX_RX_URBS; idx++) {
+			rx_cb = &dev->rx_cb[idx];
+			if (!rx_cb->pend)
+				continue;
+
+			mutex_lock(&common->rx_lock);
+			status = rsi_read_pkt(common, rx_cb->rx_buffer, 0);
+			if (status) {
+				rsi_dbg(ERR_ZONE, "%s: Failed To read data",
+					__func__);
+				mutex_unlock(&common->rx_lock);
+				break;
+			}
+			rx_cb->pend = 0;
 			mutex_unlock(&common->rx_lock);
-			return;
+
+			if (adapter->rx_urb_submit(adapter, rx_cb->ep_num)) {
+				rsi_dbg(ERR_ZONE,
+					"%s: Failed in urb submission",
+					__func__);
+				return;
+			}
 		}
-		mutex_unlock(&common->rx_lock);
 		rsi_reset_event(&dev->rx_thread.event);
-		if (adapter->rx_urb_submit(adapter)) {
-			rsi_dbg(ERR_ZONE,
-				"%s: Failed in urb submission", __func__);
-			return;
-		}
 	} while (1);
 
 out:

drivers/net/wireless/rsi/rsi_common.h

@@ -82,7 +82,7 @@ void rsi_mac80211_detach(struct rsi_hw *hw);
 u16 rsi_get_connected_channel(struct ieee80211_vif *vif);
 struct rsi_hw *rsi_91x_init(void);
 void rsi_91x_deinit(struct rsi_hw *adapter);
-int rsi_read_pkt(struct rsi_common *common, s32 rcv_pkt_len);
+int rsi_read_pkt(struct rsi_common *common, u8 *rx_pkt, s32 rcv_pkt_len);
 #ifdef CONFIG_PM
 int rsi_config_wowlan(struct rsi_hw *adapter, struct cfg80211_wowlan *wowlan);
 #endif

drivers/net/wireless/rsi/rsi_main.h

@@ -343,7 +343,7 @@ struct rsi_hw {
 	void *rsi_dev;
 	struct rsi_host_intf_ops *host_intf_ops;
 	int (*check_hw_queue_status)(struct rsi_hw *adapter, u8 q_num);
-	int (*rx_urb_submit)(struct rsi_hw *adapter);
+	int (*rx_urb_submit)(struct rsi_hw *adapter, u8 ep_num);
 	int (*determine_event_timeout)(struct rsi_hw *adapter);
 };
 

drivers/net/wireless/rsi/rsi_usb.h

@@ -39,12 +39,20 @@
 #define RSI_USB_BUF_SIZE	     4096
 #define RSI_USB_CTRL_BUF_SIZE	     0x04
 
+struct rx_usb_ctrl_block {
+	u8 *data;
+	struct urb *rx_urb;
+	u8 *rx_buffer;
+	u8 ep_num;
+	u8 pend;
+};
+
 struct rsi_91x_usbdev {
 	struct rsi_thread rx_thread;
 	u8 endpoint;
 	struct usb_device *usbdev;
 	struct usb_interface *pfunction;
-	struct urb *rx_usb_urb[MAX_RX_URBS];
+	struct rx_usb_ctrl_block rx_cb[MAX_RX_URBS];
 	u8 *tx_buffer;
 	__le16 bulkin_size;
 	u8 bulkin_endpoint_addr;