linux-kernel - [PATCH v2] USB: Support 20Gbps speed for ioctl USBDEVFS_GET

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Date:   Sat, 19 Aug 2023 13:46:55 +0800
From:   Dingyan Li <18500469033@....com>
To:     stern@...land.harvard.edu, gregkh@...uxfoundation.org
Cc:     hdegoede@...hat.com, xiaofanc@...il.com, oneukum@...e.com,
        lists.tormod@...il.com, sebastian.reichel@...labora.com,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] USB: Support 20Gbps speed for ioctl USBDEVFS_GET_SPEED

Currently ioctl USBDEVFS_GET_SPEED can only return
USB_SPEED_SUPER_PLUS at most. However, there are also
ssp rates to indicate different connection speeds, which
we can not tell further via USBDEVFS_GET_SPEED.

To fix it, this patch still uses USB_SPEED_SUPER_PLUS
to indicate USB_SSP_GEN_UNKNOWN, USB_SSP_GEN_2x1, and
USB_SSP_GEN_1x2. But need to #define a new value for
USB_SSP_GEN_2x2. Besides, move the definition of enum
usb_ssp_rate from include/linux/usb/ch9.h to
include/uapi/linux/usb/ch9.h, which is a better place
to hold it.

Signed-off-by: Dingyan Li <18500469033@....com>
---
 drivers/usb/core/devio.c          | 3 +++
 include/linux/usb/ch9.h           | 9 ---------
 include/uapi/linux/usb/ch9.h      | 8 ++++++++
 include/uapi/linux/usbdevice_fs.h | 8 ++++++--
 4 files changed, 17 insertions(+), 11 deletions(-)

diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index 1a16a8bdea60..ad13f58cbd06 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -2782,6 +2782,9 @@ static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
 		break;
 	case USBDEVFS_GET_SPEED:
 		ret = ps->dev->speed;
+		if (ret == USB_SPEED_SUPER_PLUS &&
+				ps->dev->ssp_rate == USB_SSP_GEN_2x2)
+			ret = USBDEVFS_SPEED_SUPER_PLUS_BY2;
 		break;
 	case USBDEVFS_FORBID_SUSPEND:
 		ret = proc_forbid_suspend(ps);
diff --git a/include/linux/usb/ch9.h b/include/linux/usb/ch9.h
index c93b410b314a..b5a0bc89de5c 100644
--- a/include/linux/usb/ch9.h
+++ b/include/linux/usb/ch9.h
@@ -32,15 +32,6 @@
 
 #include <uapi/linux/usb/ch9.h>
 
-/* USB 3.2 SuperSpeed Plus phy signaling rate generation and lane count */
-
-enum usb_ssp_rate {
-	USB_SSP_GEN_UNKNOWN = 0,
-	USB_SSP_GEN_2x1,
-	USB_SSP_GEN_1x2,
-	USB_SSP_GEN_2x2,
-};
-
 struct device;
 
 extern const char *usb_ep_type_string(int ep_type);
diff --git a/include/uapi/linux/usb/ch9.h b/include/uapi/linux/usb/ch9.h
index 8a147abfc680..62591eb4d30a 100644
--- a/include/uapi/linux/usb/ch9.h
+++ b/include/uapi/linux/usb/ch9.h
@@ -1185,6 +1185,14 @@ enum usb_device_speed {
 	USB_SPEED_SUPER_PLUS,			/* usb 3.1 */
 };
 
+/* USB 3.2 SuperSpeed Plus phy signaling rate generation and lane count */
+
+enum usb_ssp_rate {
+	USB_SSP_GEN_UNKNOWN = 0,
+	USB_SSP_GEN_2x1,
+	USB_SSP_GEN_1x2,
+	USB_SSP_GEN_2x2,
+};
 
 enum usb_device_state {
 	/* NOTATTACHED isn't in the USB spec, and this state acts
diff --git a/include/uapi/linux/usbdevice_fs.h b/include/uapi/linux/usbdevice_fs.h
index 74a84e02422a..46ba793f4938 100644
--- a/include/uapi/linux/usbdevice_fs.h
+++ b/include/uapi/linux/usbdevice_fs.h
@@ -180,9 +180,13 @@ struct usbdevfs_streams {
 };
 
 /*
- * USB_SPEED_* values returned by USBDEVFS_GET_SPEED are defined in
- * linux/usb/ch9.h
+ * For USBDEVFS_GET_SPEED:
+ *
+ * When speed is USB_SPEED_SUPER_PLUS and ssp_rate is USB_SSP_GEN_2x2
+ * or higher, use below definitions to indicate actual connection speed.
+ * Otherwise, just return USB_SPEED_* values defined in linux/usb/ch9.h.
  */
+#define USBDEVFS_SPEED_SUPER_PLUS_BY2	7	/* USB_SSP_GEN_2x2, 20Gbps */
 
 #define USBDEVFS_CONTROL           _IOWR('U', 0, struct usbdevfs_ctrltransfer)
 #define USBDEVFS_CONTROL32           _IOWR('U', 0, struct usbdevfs_ctrltransfer32)
-- 
2.25.1