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/** @file
Implementation of the SNP.GetStatus() function and its private helpers if
any.
Copyright (C) 2013, Red Hat, Inc.
Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials are licensed and made available
under the terms and conditions of the BSD License which accompanies this
distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include <Library/BaseLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include "VirtioNet.h"
/**
Reads the current interrupt status and recycled transmit buffer status from
a network interface.
@param This The protocol instance pointer.
@param InterruptStatus A pointer to the bit mask of the currently active
interrupts If this is NULL, the interrupt status will
not be read from the device. If this is not NULL, the
interrupt status will be read from the device. When
the interrupt status is read, it will also be
cleared. Clearing the transmit interrupt does not
empty the recycled transmit buffer array.
@param TxBuf Recycled transmit buffer address. The network
interface will not transmit if its internal recycled
transmit buffer array is full. Reading the transmit
buffer does not clear the transmit interrupt. If this
is NULL, then the transmit buffer status will not be
read. If there are no transmit buffers to recycle and
TxBuf is not NULL, * TxBuf will be set to NULL.
@retval EFI_SUCCESS The status of the network interface was
retrieved.
@retval EFI_NOT_STARTED The network interface has not been started.
@retval EFI_INVALID_PARAMETER One or more of the parameters has an
unsupported value.
@retval EFI_DEVICE_ERROR The command could not be sent to the network
interface.
@retval EFI_UNSUPPORTED This function is not supported by the network
interface.
**/
EFI_STATUS
EFIAPI
VirtioNetGetStatus (
IN EFI_SIMPLE_NETWORK_PROTOCOL *This,
OUT UINT32 *InterruptStatus OPTIONAL,
OUT VOID **TxBuf OPTIONAL
)
{
VNET_DEV *Dev;
EFI_TPL OldTpl;
EFI_STATUS Status;
UINT16 RxCurUsed;
UINT16 TxCurUsed;
if (This == NULL) {
return EFI_INVALID_PARAMETER;
}
Dev = VIRTIO_NET_FROM_SNP (This);
OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
switch (Dev->Snm.State) {
case EfiSimpleNetworkStopped:
Status = EFI_NOT_STARTED;
goto Exit;
case EfiSimpleNetworkStarted:
Status = EFI_DEVICE_ERROR;
goto Exit;
default:
break;
}
//
// update link status
//
if (Dev->Snm.MediaPresentSupported) {
UINT16 LinkStatus;
Status = VIRTIO_CFG_READ (Dev, LinkStatus, &LinkStatus);
if (EFI_ERROR (Status)) {
goto Exit;
}
Dev->Snm.MediaPresent = !!(LinkStatus & VIRTIO_NET_S_LINK_UP);
}
//
// virtio-0.9.5, 2.4.2 Receiving Used Buffers From the Device
//
MemoryFence ();
RxCurUsed = *Dev->RxRing.Used.Idx;
TxCurUsed = *Dev->TxRing.Used.Idx;
MemoryFence ();
if (InterruptStatus != NULL) {
//
// report the receive interrupt if there is data available for reception,
// report the transmit interrupt if we have transmitted at least one buffer
//
*InterruptStatus = 0;
if (Dev->RxLastUsed != RxCurUsed) {
*InterruptStatus |= EFI_SIMPLE_NETWORK_RECEIVE_INTERRUPT;
}
if (Dev->TxLastUsed != TxCurUsed) {
ASSERT (Dev->TxCurPending > 0);
*InterruptStatus |= EFI_SIMPLE_NETWORK_TRANSMIT_INTERRUPT;
}
}
if (TxBuf != NULL) {
if (Dev->TxLastUsed == TxCurUsed) {
*TxBuf = NULL;
}
else {
UINT16 UsedElemIdx;
UINT32 DescIdx;
//
// fetch the first descriptor among those that the hypervisor reports
// completed
//
ASSERT (Dev->TxCurPending > 0);
ASSERT (Dev->TxCurPending <= Dev->TxMaxPending);
UsedElemIdx = Dev->TxLastUsed++ % Dev->TxRing.QueueSize;
DescIdx = Dev->TxRing.Used.UsedElem[UsedElemIdx].Id;
ASSERT (DescIdx < (UINT32) (2 * Dev->TxMaxPending - 1));
//
// report buffer address to caller that has been enqueued by caller
//
*TxBuf = (VOID *)(UINTN) Dev->TxRing.Desc[DescIdx + 1].Addr;
//
// now this descriptor can be used again to enqueue a transmit buffer
//
Dev->TxFreeStack[--Dev->TxCurPending] = (UINT16) DescIdx;
}
}
Status = EFI_SUCCESS;
Exit:
gBS->RestoreTPL (OldTpl);
return Status;
}
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