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/*
* Copyright 2025 NVIDIA Corporation & Affiliates
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#include "config.h"
#include "fu-devlink-backend.h"
#include "fu-devlink-device.h"
struct _FuDevlinkBackend {
FuBackend parent_instance;
};
G_DEFINE_TYPE(FuDevlinkBackend, fu_devlink_backend, FU_TYPE_BACKEND)
static FuDevice *
fu_devlink_backend_create_pci_parent(FuDevlinkBackend *self,
const gchar *bus_name,
const gchar *dev_name,
GError **error)
{
FuContext *ctx = fu_backend_get_context(FU_BACKEND(self));
FuBackend *udev_backend = NULL;
g_autofree gchar *pci_sysfs_path = NULL;
g_autofree gchar *pci_sysfs_real = NULL;
g_autoptr(FuDevice) pci_device = NULL;
g_autoptr(GError) error_local = NULL;
/* get the udev backend to create PCI parent device */
udev_backend = fu_context_get_backend_by_name(ctx, "udev", &error_local);
if (udev_backend == NULL) {
g_set_error(error,
FWUPD_ERROR,
FWUPD_ERROR_NOT_SUPPORTED,
"udev backend not available: %s",
error_local->message);
return NULL;
}
/* construct PCI sysfs path from bus_name (e.g., "pci/0000:01:00.0") */
pci_sysfs_path = g_strdup_printf("/sys/bus/pci/devices/%s", dev_name);
pci_sysfs_real = fu_path_make_absolute(pci_sysfs_path, error);
if (pci_sysfs_real == NULL)
return NULL;
/* create PCI device from sysfs path */
pci_device = fu_backend_create_device(udev_backend, pci_sysfs_real, &error_local);
if (pci_device == NULL) {
g_set_error(error,
FWUPD_ERROR,
FWUPD_ERROR_NOT_FOUND,
"failed to create PCI device for %s: %s",
pci_sysfs_path,
error_local->message);
return NULL;
}
/* ensure PCI device is probed to get vendor/device info */
if (!fu_device_probe(pci_device, error)) {
g_prefix_error_literal(error, "failed to probe PCI device: ");
return NULL;
}
return g_steal_pointer(&pci_device);
}
static FuDevice *
fu_devlink_backend_create_netdevsim_parent(FuDevlinkBackend *self,
const gchar *bus_name,
const gchar *dev_name,
GError **error)
{
FuContext *ctx = fu_backend_get_context(FU_BACKEND(self));
g_autoptr(FuDevice) netdevsim_device = NULL;
g_autofree gchar *physical_id = NULL;
/* create a fake netdevsim parent device for testing */
netdevsim_device = fu_device_new(ctx);
/* set netdevsim device properties */
physical_id = g_strdup_printf("netdevsim-%s", dev_name);
fu_device_set_physical_id(netdevsim_device, physical_id);
fu_device_set_name(netdevsim_device, "Network Device Simulator");
return g_steal_pointer(&netdevsim_device);
}
FuDevice *
fu_devlink_backend_device_added(FuDevlinkBackend *self,
const gchar *bus_name,
const gchar *dev_name,
const gchar *serial_number,
GError **error)
{
FuContext *ctx = fu_backend_get_context(FU_BACKEND(self));
FuDevice *old_devlink_device;
g_autoptr(FuDevice) devlink_device = NULL;
g_autoptr(FuDevice) parent_device = NULL;
g_return_val_if_fail(FU_IS_DEVLINK_BACKEND(self), NULL);
g_return_val_if_fail(bus_name != NULL, NULL);
g_return_val_if_fail(dev_name != NULL, NULL);
g_return_val_if_fail(error == NULL || *error == NULL, NULL);
/* only support PCI and netdevsim buses */
if (g_strcmp0(bus_name, "pci") == 0) {
parent_device =
fu_devlink_backend_create_pci_parent(self, bus_name, dev_name, error);
if (parent_device == NULL)
return NULL;
} else if (g_strcmp0(bus_name, "netdevsim") == 0) {
parent_device =
fu_devlink_backend_create_netdevsim_parent(self, bus_name, dev_name, error);
if (parent_device == NULL)
return NULL;
} else {
g_set_error(error,
FWUPD_ERROR,
FWUPD_ERROR_NOT_SUPPORTED,
"unsupported bus type: %s (only 'pci' and 'netdevsim' are supported)",
bus_name);
return NULL;
}
/* create devlink device */
devlink_device = fu_devlink_device_new(ctx, bus_name, dev_name, serial_number);
if (devlink_device == NULL) {
g_set_error_literal(error,
FWUPD_ERROR,
FWUPD_ERROR_INTERNAL,
"failed to create devlink device");
return NULL;
}
/* only add one device for the PCI card, use serial number as backend id */
if (serial_number != NULL)
fu_device_set_backend_id(devlink_device, serial_number);
/* in case the device with the same backend id already exists, skip this one */
old_devlink_device =
fu_backend_lookup_by_id(FU_BACKEND(self), fu_device_get_backend_id(devlink_device));
if (old_devlink_device != NULL) {
g_set_error(error,
FWUPD_ERROR,
FWUPD_ERROR_NOTHING_TO_DO,
"device with the same backend id already exists: %s",
fu_device_get_backend_id(devlink_device));
return NULL;
}
/* incorporate information from parent device (without setting hierarchy) */
fu_device_incorporate(devlink_device,
parent_device,
FU_DEVICE_INCORPORATE_FLAG_BASECLASS |
FU_DEVICE_INCORPORATE_FLAG_VENDOR |
FU_DEVICE_INCORPORATE_FLAG_VENDOR_IDS |
FU_DEVICE_INCORPORATE_FLAG_VID | FU_DEVICE_INCORPORATE_FLAG_PID);
/* only add the devlink device to the backend - parent is managed by its own backend */
fu_backend_device_added(FU_BACKEND(self), devlink_device);
return g_steal_pointer(&devlink_device);
}
void
fu_devlink_backend_device_removed(FuDevlinkBackend *self, FuDevice *devlink_device)
{
g_return_if_fail(FU_IS_DEVLINK_BACKEND(self));
g_return_if_fail(FU_IS_DEVICE(devlink_device));
fu_backend_device_removed(FU_BACKEND(self), devlink_device);
}
static void
fu_devlink_backend_init(FuDevlinkBackend *self)
{
}
static void
fu_devlink_backend_class_init(FuDevlinkBackendClass *klass)
{
}
FuBackend *
fu_devlink_backend_new(FuContext *ctx)
{
return FU_BACKEND(g_object_new(FU_TYPE_DEVLINK_BACKEND,
"name",
"devlink",
"context",
ctx,
"device-gtype",
FU_TYPE_DEVLINK_DEVICE,
NULL));
}
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