Как узнать в какой порт вставлена флешка на сервере - в 2.0 или в 3.0 ?

The bcdUSB field reports the highest version of USB the device supports. The value is in binary coded decimal with a format of 0xJJMN where JJ is the major version number, M is the minor version number and N is the sub minor version number. e.g. USB 2.0 is reported as 0x0200, USB 1.1 as 0x0110 and USB 1.0 as 0x0100.

__le16 wSpeedSupported;
#define USB_LOW_SPEED_OPERATION		(1)	 /* Low speed operation */
#define USB_FULL_SPEED_OPERATION	(1 << 1) /* Full speed operation */
#define USB_HIGH_SPEED_OPERATION	(1 << 2) /* High speed operation */
#define USB_5GBPS_OPERATION		(1 << 3) /* Operation at 5Gbps */

$ lsusb | grep King
Bus 002 Device 002: ID 0951:1666 Kingston Technology DataTraveler 100 G3/G4/SE9 G2

$ sudo lsusb -vs 002:002 | grep SuperSpeed
can't get debug descriptor: Resource temporarily unavailable
  SuperSpeed USB Device Capability:
      Device can operate at SuperSpeed (5Gbps)

static void do_debug(libusb_device_handle *fd)
{
	unsigned char buf[4];
	int ret;

	ret = usb_control_msg(fd,
			LIBUSB_ENDPOINT_IN | LIBUSB_REQUEST_TYPE_STANDARD | LIBUSB_RECIPIENT_DEVICE,
			LIBUSB_REQUEST_GET_DESCRIPTOR,
			USB_DT_DEBUG << 8, 0,
			buf, sizeof buf, CTRL_TIMEOUT);
	if (ret < 0 && errno != EPIPE)
		perror("can't get debug descriptor");

	/* some high speed devices are also "USB2 debug devices", meaning
	 * you can use them with some EHCI implementations as another kind
	 * of system debug channel:  like JTAG, RS232, or a console.
	 */
	if (ret != sizeof buf
			|| buf[0] != ret
			|| buf[1] != USB_DT_DEBUG)
		return;

	printf("Debug descriptor:\n"
	       "  bLength              %4u\n"
	       "  bDescriptorType      %4u\n"
	       "  bDebugInEndpoint     0x%02x\n"
	       "  bDebugOutEndpoint    0x%02x\n",
	       buf[0], buf[1],
	       buf[2], buf[3]);
}