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usb: endpoints calculation

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This commit is contained in:
Maxim Devaev
2025-01-04 18:27:17 +02:00
parent 7aa963330c
commit f9584929e3
3 changed files with 79 additions and 42 deletions
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83
kvmd/apps/otg/__init__.py
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@@ -102,31 +102,33 @@ def _check_config(config: Section) -> None:
# =====
class _GadgetConfig:
def __init__(self, gadget_path: str, profile_path: str, meta_path: str) -> None:
def __init__(self, gadget_path: str, profile_path: str, meta_path: str, eps: int) -> None:
self.__gadget_path = gadget_path
self.__profile_path = profile_path
self.__meta_path = meta_path
self.__eps_max = eps
self.__eps_used = 0
self.__hid_instance = 0
self.__msd_instance = 0
_mkdir(meta_path)
def add_serial(self, start: bool) -> None:
eps = 3
func = "acm.usb0"
func_path = join(self.__gadget_path, "functions", func)
_mkdir(func_path)
self.__create_function(func)
if start:
_symlink(func_path, join(self.__profile_path, func))
self.__create_meta(func, "Serial Port")
self.__start_function(func, eps)
self.__create_meta(func, "Serial Port", eps)
def add_ethernet(self, start: bool, driver: str, host_mac: str, kvm_mac: str) -> None:
eps = 3
if host_mac and kvm_mac and host_mac == kvm_mac:
raise RuntimeError("Ethernet host_mac should not be equal to kvm_mac")
real_driver = driver
if driver == "rndis5":
real_driver = "rndis"
func = f"{real_driver}.usb0"
func_path = join(self.__gadget_path, "functions", func)
_mkdir(func_path)
func_path = self.__create_function(func)
if host_mac:
_write(join(func_path, "host_addr"), host_mac)
if kvm_mac:
@@ -146,8 +148,8 @@ class _GadgetConfig:
_write(join(func_path, "os_desc/interface.rndis/sub_compatible_id"), "5162001")
_symlink(self.__profile_path, join(self.__gadget_path, "os_desc", usb.G_PROFILE_NAME))
if start:
_symlink(func_path, join(self.__profile_path, func))
self.__create_meta(func, "Ethernet")
self.__start_function(func, eps)
self.__create_meta(func, "Ethernet", eps)
def add_keyboard(self, start: bool, remote_wakeup: bool) -> None:
self.__add_hid("Keyboard", start, remote_wakeup, make_keyboard_hid())
@@ -157,9 +159,9 @@ class _GadgetConfig:
self.__add_hid(name, start, remote_wakeup, make_mouse_hid(absolute, horizontal_wheel))
def __add_hid(self, name: str, start: bool, remote_wakeup: bool, hid: Hid) -> None:
eps = 1
func = f"hid.usb{self.__hid_instance}"
func_path = join(self.__gadget_path, "functions", func)
_mkdir(func_path)
func_path = self.__create_function(func)
_write(join(func_path, "no_out_endpoint"), "1", optional=True)
if remote_wakeup:
_write(join(func_path, "wakeup_on_write"), "1", optional=True)
@@ -168,14 +170,17 @@ class _GadgetConfig:
_write(join(func_path, "report_length"), hid.report_length)
_write_bytes(join(func_path, "report_desc"), hid.report_descriptor)
if start:
_symlink(func_path, join(self.__profile_path, func))
self.__create_meta(func, name)
self.__start_function(func, eps)
self.__create_meta(func, name, eps)
self.__hid_instance += 1
def add_msd(self, start: bool, user: str, stall: bool, cdrom: bool, rw: bool, removable: bool, fua: bool) -> None:
# Endpoints number depends on transport_type but we can consider that this is 2
# because transport_type is always USB_PR_BULK by default if CONFIG_USB_FILE_STORAGE_TEST
# is not defined. See drivers/usb/gadget/function/storage_common.c
eps = 2
func = f"mass_storage.usb{self.__msd_instance}"
func_path = join(self.__gadget_path, "functions", func)
_mkdir(func_path)
func_path = self.__create_function(func)
_write(join(func_path, "stall"), int(stall))
_write(join(func_path, "lun.0/cdrom"), int(cdrom))
_write(join(func_path, "lun.0/ro"), int(not rw))
@@ -187,13 +192,30 @@ class _GadgetConfig:
_chown(join(func_path, "lun.0/file"), user)
_chown(join(func_path, "lun.0/forced_eject"), user)
if start:
_symlink(func_path, join(self.__profile_path, func))
self.__start_function(func, eps)
name = ("Mass Storage Drive" if self.__msd_instance == 0 else f"Extra Drive #{self.__msd_instance}")
self.__create_meta(func, name)
self.__create_meta(func, name, eps)
self.__msd_instance += 1
def __create_meta(self, func: str, name: str) -> None:
_write(join(self.__meta_path, f"{func}@meta.json"), json.dumps({"func": func, "name": name}))
def __create_function(self, func: str) -> str:
func_path = join(self.__gadget_path, "functions", func)
_mkdir(func_path)
return func_path
def __start_function(self, func: str, eps: int) -> None:
func_path = join(self.__gadget_path, "functions", func)
if self.__eps_max - self.__eps_used >= eps:
_symlink(func_path, join(self.__profile_path, func))
self.__eps_used += eps
else:
get_logger().info("Will not be started: No available endpoints")
def __create_meta(self, func: str, name: str, eps: int) -> None:
_write(join(self.__meta_path, f"{func}@meta.json"), json.dumps({
"function": func,
"name": name,
"endpoints": eps,
}))
def _cmd_start(config: Section) -> None: # pylint: disable=too-many-statements,too-many-branches
@@ -244,25 +266,18 @@ def _cmd_start(config: Section) -> None: # pylint: disable=too-many-statements,
# XXX: Should we use MaxPower=100 with Remote Wakeup?
_write(join(profile_path, "bmAttributes"), "0xA0")
gc = _GadgetConfig(gadget_path, profile_path, config.otg.meta)
gc = _GadgetConfig(gadget_path, profile_path, config.otg.meta, config.otg.endpoints)
cod = config.otg.devices
if cod.serial.enabled:
logger.info("===== Serial =====")
gc.add_serial(cod.serial.start)
if cod.ethernet.enabled:
logger.info("===== Ethernet =====")
gc.add_ethernet(**cod.ethernet._unpack(ignore=["enabled"]))
if config.kvmd.hid.type == "otg":
logger.info("===== HID-Keyboard =====")
gc.add_keyboard(cod.hid.keyboard.start, config.otg.remote_wakeup)
logger.info("===== HID-Mouse =====")
gc.add_mouse(cod.hid.mouse.start, config.otg.remote_wakeup, config.kvmd.hid.mouse.absolute, config.kvmd.hid.mouse.horizontal_wheel)
ckhm = config.kvmd.hid.mouse
gc.add_mouse(cod.hid.mouse.start, config.otg.remote_wakeup, ckhm.absolute, ckhm.horizontal_wheel)
if config.kvmd.hid.mouse_alt.device:
logger.info("===== HID-Mouse-Alt =====")
gc.add_mouse(cod.hid.mouse_alt.start, config.otg.remote_wakeup, (not config.kvmd.hid.mouse.absolute), config.kvmd.hid.mouse.horizontal_wheel)
gc.add_mouse(cod.hid.mouse_alt.start, config.otg.remote_wakeup, (not ckhm.absolute), ckhm.horizontal_wheel)
if config.kvmd.msd.type == "otg":
logger.info("===== MSD =====")
@@ -272,6 +287,14 @@ def _cmd_start(config: Section) -> None: # pylint: disable=too-many-statements,
logger.info("===== MSD Extra: %d =====", count + 1)
gc.add_msd(cod.drives.start, "root", **cod.drives.default._unpack())
if cod.ethernet.enabled:
logger.info("===== Ethernet =====")
gc.add_ethernet(**cod.ethernet._unpack(ignore=["enabled"]))
if cod.serial.enabled:
logger.info("===== Serial =====")
gc.add_serial(cod.serial.start)
logger.info("===== Preparing complete =====")
logger.info("Enabling the gadget ...")