usb: gadget: add a inline function gether_bitrate()

In function ecm_bitrate(), it is not support report bit rate for super
speed plus mode, but it can use same bit rate value defined in ncm and
rndis.

Add a common inline function gether_bitrate() which report different for
all possible speeds, it can be used by ecm, ncm and rndis, also remove
old function from them.

Signed-off-by: Linyu Yuan <quic_linyyuan@quicinc.com>
Link: https://lore.kernel.org/r/20230803091053.9714-3-quic_linyyuan@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: Linyu Yuan

drivers/usb/gadget/function/f_ecm.c

@@ -65,17 +65,6 @@ static inline struct f_ecm *func_to_ecm(struct usb_function *f)
 	return container_of(f, struct f_ecm, port.func);
 }
 
-/* peak (theoretical) bulk transfer rate in bits-per-second */
-static inline unsigned ecm_bitrate(struct usb_gadget *g)
-{
-	if (g->speed == USB_SPEED_SUPER)
-		return 13 * 1024 * 8 * 1000 * 8;
-	else if (g->speed == USB_SPEED_HIGH)
-		return 13 * 512 * 8 * 1000 * 8;
-	else
-		return 19 * 64 * 1 * 1000 * 8;
-}
-
 /*-------------------------------------------------------------------------*/
 
 /*
@@ -411,10 +400,10 @@ static void ecm_do_notify(struct f_ecm *ecm)
 
 		/* SPEED_CHANGE data is up/down speeds in bits/sec */
 		data = req->buf + sizeof *event;
-		data[0] = cpu_to_le32(ecm_bitrate(cdev->gadget));
+		data[0] = cpu_to_le32(gether_bitrate(cdev->gadget));
 		data[1] = data[0];
 
-		DBG(cdev, "notify speed %d\n", ecm_bitrate(cdev->gadget));
+		DBG(cdev, "notify speed %d\n", gether_bitrate(cdev->gadget));
 		ecm->notify_state = ECM_NOTIFY_NONE;
 		break;
 	}

drivers/usb/gadget/function/f_ncm.c

@@ -80,21 +80,6 @@ static inline struct f_ncm *func_to_ncm(struct usb_function *f)
 	return container_of(f, struct f_ncm, port.func);
 }
 
-/* peak (theoretical) bulk transfer rate in bits-per-second */
-static inline unsigned ncm_bitrate(struct usb_gadget *g)
-{
-	if (!g)
-		return 0;
-	else if (g->speed >= USB_SPEED_SUPER_PLUS)
-		return 4250000000U;
-	else if (g->speed == USB_SPEED_SUPER)
-		return 3750000000U;
-	else if (g->speed == USB_SPEED_HIGH)
-		return 13 * 512 * 8 * 1000 * 8;
-	else
-		return 19 *  64 * 1 * 1000 * 8;
-}
-
 /*-------------------------------------------------------------------------*/
 
 /*
@@ -576,10 +561,10 @@ static void ncm_do_notify(struct f_ncm *ncm)
 
 		/* SPEED_CHANGE data is up/down speeds in bits/sec */
 		data = req->buf + sizeof *event;
-		data[0] = cpu_to_le32(ncm_bitrate(cdev->gadget));
+		data[0] = cpu_to_le32(gether_bitrate(cdev->gadget));
 		data[1] = data[0];
 
-		DBG(cdev, "notify speed %u\n", ncm_bitrate(cdev->gadget));
+		DBG(cdev, "notify speed %u\n", gether_bitrate(cdev->gadget));
 		ncm->notify_state = NCM_NOTIFY_CONNECT;
 		break;
 	}

drivers/usb/gadget/function/f_rndis.c

@@ -84,19 +84,6 @@ static inline struct f_rndis *func_to_rndis(struct usb_function *f)
 	return container_of(f, struct f_rndis, port.func);
 }
 
-/* peak (theoretical) bulk transfer rate in bits-per-second */
-static unsigned int bitrate(struct usb_gadget *g)
-{
-	if (g->speed >= USB_SPEED_SUPER_PLUS)
-		return 4250000000U;
-	if (g->speed == USB_SPEED_SUPER)
-		return 3750000000U;
-	else if (g->speed == USB_SPEED_HIGH)
-		return 13 * 512 * 8 * 1000 * 8;
-	else
-		return 19 * 64 * 1 * 1000 * 8;
-}
-
 /*-------------------------------------------------------------------------*/
 
 /*
@@ -640,7 +627,7 @@ static void rndis_open(struct gether *geth)
 	DBG(cdev, "%s\n", __func__);
 
 	rndis_set_param_medium(rndis->params, RNDIS_MEDIUM_802_3,
-				bitrate(cdev->gadget) / 100);
+				gether_bitrate(cdev->gadget) / 100);
 	rndis_signal_connect(rndis->params);
 }
 

drivers/usb/gadget/function/u_ether.h

@@ -279,4 +279,17 @@ static inline bool can_support_ecm(struct usb_gadget *gadget)
 	return true;
 }
 
+/* peak (theoretical) bulk transfer rate in bits-per-second */
+static inline unsigned int gether_bitrate(struct usb_gadget *g)
+{
+	if (g->speed >= USB_SPEED_SUPER_PLUS)
+		return 4250000000U;
+	if (g->speed == USB_SPEED_SUPER)
+		return 3750000000U;
+	else if (g->speed == USB_SPEED_HIGH)
+		return 13 * 512 * 8 * 1000 * 8;
+	else
+		return 19 * 64 * 1 * 1000 * 8;
+}
+
 #endif /* __U_ETHER_H */