/*
Temporarily enable then reset the virtio-net device in order to retrieve
configuration values needed by Simple Network Protocol and Simple Network
Mode fields.
Only VirtioNetSnpPopulate() may call this function.
If the function fails for any reason, the virtio-net device is moved to
VSTAT_FAILED instead of being reset. This serves only informative purposes
for the host side.
param[in,out] Dev The VNET_DEV structure being created for
the virtio-net device.
param[out] MacAddress MAC address configured by the host.
param[out] MediaPresentSupported Link status is made available by the host.
param[out] MediaPresent If link status is made available by the
host, the current link status is stored in
*MediaPresent. Otherwise MediaPresent is
unused.
@retval EFI_UNSUPPORTED The host doesn't supply a MAC address.
@return Status codes from VirtIo protocol members.
@retval EFI_SUCCESS Configuration values retrieved.
*/
STATIC
EFI_STATUS
EFIAPI
VirtioNetGetFeatures (
IN OUT VNET_DEV *Dev,
OUT EFI_MAC_ADDRESS *MacAddress,
OUT BOOLEAN *MediaPresentSupported,
OUT BOOLEAN *MediaPresent
)
{
EFI_STATUS Status;
UINT8 NextDevStat;
UINT32 Features;
UINTN MacIdx;
UINT16 LinkStatus;
//
// Interrogate the device for features (virtio-0.9.5, 2.2.1 Device
// Initialization Sequence), but don't complete setting it up.
//
NextDevStat = 0; // step 1 -- reset device
Status = Dev->VirtIo->SetDeviceStatus (Dev->VirtIo, NextDevStat);
if (EFI_ERROR (Status)) {
return Status;
}
NextDevStat |= VSTAT_ACK; // step 2 -- acknowledge device presence
Status = Dev->VirtIo->SetDeviceStatus (Dev->VirtIo, NextDevStat);
if (EFI_ERROR (Status)) {
goto YieldDevice;
}
NextDevStat |= VSTAT_DRIVER; // step 3 -- we know how to drive it
Status = Dev->VirtIo->SetDeviceStatus (Dev->VirtIo, NextDevStat);
if (EFI_ERROR (Status)) {
goto YieldDevice;
}
//
// step 4a -- retrieve and validate features
//
Status = Dev->VirtIo->GetDeviceFeatures (Dev->VirtIo, &Features);
if (EFI_ERROR (Status)) {
goto YieldDevice;
}
//
// get MAC address byte-wise
//
if ((Features & VIRTIO_NET_F_MAC) == 0) {
Status = EFI_UNSUPPORTED;
goto YieldDevice;
}
for (MacIdx = 0; MacIdx < SIZE_OF_VNET (Mac); ++MacIdx) {
Status = Dev->VirtIo->ReadDevice (Dev->VirtIo,
OFFSET_OF_VNET (Mac) + MacIdx, // Offset
1, // FieldSize
1, // BufferSize
&MacAddress->Addr[MacIdx] // Buffer
);
if (EFI_ERROR (Status)) {
goto YieldDevice;
}
}
//
// check if link status is reported, and if so, what the link status is
//
if ((Features & VIRTIO_NET_F_STATUS) == 0) {
*MediaPresentSupported = FALSE;
}
else {
*MediaPresentSupported = TRUE;
Status = VIRTIO_CFG_READ (Dev, LinkStatus, &LinkStatus);
if (EFI_ERROR (Status)) {
goto YieldDevice;
}
*MediaPresent = !!(LinkStatus & VIRTIO_NET_S_LINK_UP);
}
YieldDevice:
Dev->VirtIo->SetDeviceStatus (Dev->VirtIo,
EFI_ERROR (Status) ? VSTAT_FAILED : 0);
return Status;
}
/*
Temporarily enable then reset the virtio-net device in order to retrieve
configuration values needed by Simple Network Protocol and Simple Network
Mode fields.
Only VirtioNetSnpPopulate() may call this function.
If the function fails for any reason, the virtio-net device is moved to
VSTAT_FAILED instead of being reset. This serves only informative purposes
for the host side.
param[in,out] Dev The VNET_DEV structure being created for
the virtio-net device.
param[out] MacAddress MAC address configured by the host.
param[out] MediaPresentSupported Link status is made available by the host.
param[out] MediaPresent If link status is made available by the
host, the current link status is stored in
*MediaPresent. Otherwise MediaPresent is
unused.
@retval EFI_UNSUPPORTED The host doesn't supply a MAC address.
@return Status codes from Dev->PciIo->Io.Read(),
VIRTIO_CFG_READ() and VIRTIO_CFG_WRITE().
@retval EFI_SUCCESS Configuration values retrieved.
*/
STATIC
EFI_STATUS
EFIAPI
VirtioNetGetFeatures (
IN OUT VNET_DEV *Dev,
OUT EFI_MAC_ADDRESS *MacAddress,
OUT BOOLEAN *MediaPresentSupported,
OUT BOOLEAN *MediaPresent
)
{
EFI_STATUS Status;
UINT8 NextDevStat;
UINT32 Features;
UINT16 LinkStatus;
//
// Interrogate the device for features (virtio-0.9.5, 2.2.1 Device
// Initialization Sequence), but don't complete setting it up.
//
NextDevStat = 0; // step 1 -- reset device
Status = VIRTIO_CFG_WRITE (Dev, Generic.VhdrDeviceStatus, NextDevStat);
if (EFI_ERROR (Status)) {
return Status;
}
NextDevStat |= VSTAT_ACK; // step 2 -- acknowledge device presence
Status = VIRTIO_CFG_WRITE (Dev, Generic.VhdrDeviceStatus, NextDevStat);
if (EFI_ERROR (Status)) {
goto YieldDevice;
}
NextDevStat |= VSTAT_DRIVER; // step 3 -- we know how to drive it
Status = VIRTIO_CFG_WRITE (Dev, Generic.VhdrDeviceStatus, NextDevStat);
if (EFI_ERROR (Status)) {
goto YieldDevice;
}
//
// step 4a -- retrieve and validate features
//
Status = VIRTIO_CFG_READ (Dev, Generic.VhdrDeviceFeatureBits, &Features);
if (EFI_ERROR (Status)) {
goto YieldDevice;
}
//
// get MAC address byte-wise
//
if ((Features & VIRTIO_NET_F_MAC) == 0) {
Status = EFI_UNSUPPORTED;
goto YieldDevice;
}
Status = Dev->PciIo->Io.Read (Dev->PciIo, // PciIo
EfiPciIoWidthUint8, // Width
PCI_BAR_IDX0, // BarIndex
OFFSET_OF_VNET (VhdrMac), // Offset
SIZE_OF_VNET (VhdrMac), // Count
MacAddress // Buffer
);
if (EFI_ERROR (Status)) {
goto YieldDevice;
}
//
// check if link status is reported, and if so, what the link status is
//
if ((Features & VIRTIO_NET_F_STATUS) == 0) {
*MediaPresentSupported = FALSE;
}
else {
*MediaPresentSupported = TRUE;
Status = VIRTIO_CFG_READ (Dev, VhdrLinkStatus, &LinkStatus);
if (EFI_ERROR (Status)) {
goto YieldDevice;
}
*MediaPresent = !!(LinkStatus & VIRTIO_NET_S_LINK_UP);
}
YieldDevice:
VIRTIO_CFG_WRITE (Dev, Generic.VhdrDeviceStatus,
EFI_ERROR (Status) ? VSTAT_FAILED : 0);
return Status;
}
