| Vishal Bhoj | 82c8071 | 2015-12-15 21:13:33 +0530 | [diff] [blame^] | 1 | /** @file
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| 2 |
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| 3 | Implementation of the SNP.GetStatus() function and its private helpers if
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| 4 | any.
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| 5 |
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| 6 | Copyright (C) 2013, Red Hat, Inc.
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| 7 | Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>
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| 8 |
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| 9 | This program and the accompanying materials are licensed and made available
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| 10 | under the terms and conditions of the BSD License which accompanies this
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| 11 | distribution. The full text of the license may be found at
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| 12 | http://opensource.org/licenses/bsd-license.php
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| 13 |
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| 14 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
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| 15 | WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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| 16 |
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| 17 | **/
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| 18 |
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| 19 | #include <Library/BaseLib.h>
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| 20 | #include <Library/UefiBootServicesTableLib.h>
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| 21 |
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| 22 | #include "VirtioNet.h"
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| 23 |
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| 24 | /**
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| 25 | Reads the current interrupt status and recycled transmit buffer status from
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| 26 | a network interface.
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| 27 |
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| 28 | @param This The protocol instance pointer.
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| 29 | @param InterruptStatus A pointer to the bit mask of the currently active
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| 30 | interrupts If this is NULL, the interrupt status will
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| 31 | not be read from the device. If this is not NULL, the
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| 32 | interrupt status will be read from the device. When
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| 33 | the interrupt status is read, it will also be
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| 34 | cleared. Clearing the transmit interrupt does not
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| 35 | empty the recycled transmit buffer array.
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| 36 | @param TxBuf Recycled transmit buffer address. The network
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| 37 | interface will not transmit if its internal recycled
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| 38 | transmit buffer array is full. Reading the transmit
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| 39 | buffer does not clear the transmit interrupt. If this
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| 40 | is NULL, then the transmit buffer status will not be
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| 41 | read. If there are no transmit buffers to recycle and
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| 42 | TxBuf is not NULL, * TxBuf will be set to NULL.
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| 43 |
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| 44 | @retval EFI_SUCCESS The status of the network interface was
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| 45 | retrieved.
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| 46 | @retval EFI_NOT_STARTED The network interface has not been started.
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| 47 | @retval EFI_INVALID_PARAMETER One or more of the parameters has an
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| 48 | unsupported value.
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| 49 | @retval EFI_DEVICE_ERROR The command could not be sent to the network
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| 50 | interface.
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| 51 | @retval EFI_UNSUPPORTED This function is not supported by the network
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| 52 | interface.
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| 53 |
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| 54 | **/
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| 55 |
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| 56 | EFI_STATUS
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| 57 | EFIAPI
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| 58 | VirtioNetGetStatus (
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| 59 | IN EFI_SIMPLE_NETWORK_PROTOCOL *This,
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| 60 | OUT UINT32 *InterruptStatus OPTIONAL,
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| 61 | OUT VOID **TxBuf OPTIONAL
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| 62 | )
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| 63 | {
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| 64 | VNET_DEV *Dev;
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| 65 | EFI_TPL OldTpl;
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| 66 | EFI_STATUS Status;
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| 67 | UINT16 RxCurUsed;
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| 68 | UINT16 TxCurUsed;
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| 69 |
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| 70 | if (This == NULL) {
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| 71 | return EFI_INVALID_PARAMETER;
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| 72 | }
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| 73 |
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| 74 | Dev = VIRTIO_NET_FROM_SNP (This);
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| 75 | OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
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| 76 | switch (Dev->Snm.State) {
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| 77 | case EfiSimpleNetworkStopped:
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| 78 | Status = EFI_NOT_STARTED;
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| 79 | goto Exit;
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| 80 | case EfiSimpleNetworkStarted:
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| 81 | Status = EFI_DEVICE_ERROR;
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| 82 | goto Exit;
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| 83 | default:
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| 84 | break;
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| 85 | }
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| 86 |
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| 87 | //
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| 88 | // update link status
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| 89 | //
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| 90 | if (Dev->Snm.MediaPresentSupported) {
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| 91 | UINT16 LinkStatus;
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| 92 |
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| 93 | Status = VIRTIO_CFG_READ (Dev, LinkStatus, &LinkStatus);
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| 94 | if (EFI_ERROR (Status)) {
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| 95 | goto Exit;
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| 96 | }
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| 97 | Dev->Snm.MediaPresent =
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| 98 | (BOOLEAN) ((LinkStatus & VIRTIO_NET_S_LINK_UP) != 0);
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| 99 | }
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| 100 |
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| 101 | //
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| 102 | // virtio-0.9.5, 2.4.2 Receiving Used Buffers From the Device
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| 103 | //
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| 104 | MemoryFence ();
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| 105 | RxCurUsed = *Dev->RxRing.Used.Idx;
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| 106 | TxCurUsed = *Dev->TxRing.Used.Idx;
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| 107 | MemoryFence ();
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| 108 |
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| 109 | if (InterruptStatus != NULL) {
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| 110 | //
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| 111 | // report the receive interrupt if there is data available for reception,
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| 112 | // report the transmit interrupt if we have transmitted at least one buffer
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| 113 | //
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| 114 | *InterruptStatus = 0;
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| 115 | if (Dev->RxLastUsed != RxCurUsed) {
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| 116 | *InterruptStatus |= EFI_SIMPLE_NETWORK_RECEIVE_INTERRUPT;
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| 117 | }
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| 118 | if (Dev->TxLastUsed != TxCurUsed) {
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| 119 | ASSERT (Dev->TxCurPending > 0);
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| 120 | *InterruptStatus |= EFI_SIMPLE_NETWORK_TRANSMIT_INTERRUPT;
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| 121 | }
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| 122 | }
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| 123 |
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| 124 | if (TxBuf != NULL) {
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| 125 | if (Dev->TxLastUsed == TxCurUsed) {
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| 126 | *TxBuf = NULL;
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| 127 | }
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| 128 | else {
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| 129 | UINT16 UsedElemIdx;
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| 130 | UINT32 DescIdx;
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| 131 |
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| 132 | //
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| 133 | // fetch the first descriptor among those that the hypervisor reports
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| 134 | // completed
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| 135 | //
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| 136 | ASSERT (Dev->TxCurPending > 0);
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| 137 | ASSERT (Dev->TxCurPending <= Dev->TxMaxPending);
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| 138 |
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| 139 | UsedElemIdx = Dev->TxLastUsed++ % Dev->TxRing.QueueSize;
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| 140 | DescIdx = Dev->TxRing.Used.UsedElem[UsedElemIdx].Id;
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| 141 | ASSERT (DescIdx < (UINT32) (2 * Dev->TxMaxPending - 1));
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| 142 |
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| 143 | //
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| 144 | // report buffer address to caller that has been enqueued by caller
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| 145 | //
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| 146 | *TxBuf = (VOID *)(UINTN) Dev->TxRing.Desc[DescIdx + 1].Addr;
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| 147 |
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| 148 | //
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| 149 | // now this descriptor can be used again to enqueue a transmit buffer
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| 150 | //
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| 151 | Dev->TxFreeStack[--Dev->TxCurPending] = (UINT16) DescIdx;
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| 152 | }
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| 153 | }
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| 154 |
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| 155 | Status = EFI_SUCCESS;
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| 156 |
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| 157 | Exit:
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| 158 | gBS->RestoreTPL (OldTpl);
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| 159 | return Status;
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| 160 | }
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