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system76-edk2/OvmfPkg/VirtioNetDxe/VirtioNet.h
Brijesh Singh bd114d9f77 OvmfPkg/VirtioNetDxe: add Tx packet map/unmap helper functions 
When device is behind IOMMU, driver is require to pass the device address
of TxBuf in the Tx VRING. The patch adds helper functions and data
structure to map and unmap the TxBuf system physical address to a device
address.

Since the TxBuf is returned back to caller from VirtioNetGetStatus() hence
we use OrderedCollection interface to save the TxBuf system physical to
device address mapping. After the TxBuf is succesfully transmitted
VirtioNetUnmapTxBuf() does the reverse lookup in OrderedCollection data
structure to get the system physical address of TxBuf for a given device
address.

Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Regression-tested-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>
2017-09-14 23:54:15 +02:00

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/** @file
Internal definitions for the virtio-net driver, which produces Simple Network
Protocol instances for virtio-net devices.
Copyright (C) 2013, Red Hat, Inc.
Copyright (c) 2017, AMD Inc, 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.
**/
#ifndef _VIRTIO_NET_DXE_H_
#define _VIRTIO_NET_DXE_H_
#include <IndustryStandard/VirtioNet.h>
#include <Library/DebugLib.h>
#include <Library/VirtioLib.h>
#include <Protocol/ComponentName.h>
#include <Protocol/ComponentName2.h>
#include <Protocol/DevicePath.h>
#include <Protocol/DriverBinding.h>
#include <Protocol/SimpleNetwork.h>
#include <Library/OrderedCollectionLib.h>
#define VNET_SIG SIGNATURE_32 ('V', 'N', 'E', 'T')
//
// maximum number of pending packets, separately for each direction
//
#define VNET_MAX_PENDING 64
//
// State diagram:
//
// | ^
// | |
// BindingStart BindingStop
// +SnpPopulate |
// ++GetFeatures |
// | |
// v |
// +---------+ virtio-net device is reset, no resources are
// | stopped | allocated for traffic, but MAC address has
// +---------+ been retrieved
// | ^
// | |
// SNP.Start SNP.Stop
// | |
// v |
// +---------+
// | started | functionally identical to stopped
// +---------+
// | ^
// | |
// SNP.Initialize SNP.Shutdown
// | |
// v |
// +-------------+ Virtio-net setup complete, including DRIVER_OK
// | initialized | bit. The receive queue is populated with
// +-------------+ requests; McastIpToMac, GetStatus, Transmit,
// Receive are callable.
//
typedef struct {
//
// Parts of this structure are initialized / torn down in various functions
// at various call depths. The table to the right should make it easier to
// track them.
//
// field init function
// ------------------ ------------------------------
UINT32 Signature; // VirtioNetDriverBindingStart
VIRTIO_DEVICE_PROTOCOL *VirtIo; // VirtioNetDriverBindingStart
EFI_SIMPLE_NETWORK_PROTOCOL Snp; // VirtioNetSnpPopulate
EFI_SIMPLE_NETWORK_MODE Snm; // VirtioNetSnpPopulate
EFI_EVENT ExitBoot; // VirtioNetSnpPopulate
EFI_DEVICE_PATH_PROTOCOL *MacDevicePath; // VirtioNetDriverBindingStart
EFI_HANDLE MacHandle; // VirtioNetDriverBindingStart
VRING RxRing; // VirtioNetInitRing
VOID *RxRingMap; // VirtioRingMap and
// VirtioNetInitRing
UINT8 *RxBuf; // VirtioNetInitRx
UINT16 RxLastUsed; // VirtioNetInitRx
UINTN RxBufNrPages; // VirtioNetInitRx
EFI_PHYSICAL_ADDRESS RxBufDeviceBase; // VirtioNetInitRx
VOID *RxBufMap; // VirtioNetInitRx
VRING TxRing; // VirtioNetInitRing
VOID *TxRingMap; // VirtioRingMap and
// VirtioNetInitRing
UINT16 TxMaxPending; // VirtioNetInitTx
UINT16 TxCurPending; // VirtioNetInitTx
UINT16 *TxFreeStack; // VirtioNetInitTx
VIRTIO_1_0_NET_REQ *TxSharedReq; // VirtioNetInitTx
VOID *TxSharedReqMap; // VirtioNetInitTx
UINT16 TxLastUsed; // VirtioNetInitTx
ORDERED_COLLECTION *TxBufCollection; // VirtioNetInitTx
} VNET_DEV;
//
// In order to avoid duplication of interface documentation, please find all
// leading comments near the respective function / variable definitions (not
// the declarations here), which is where your code editor of choice takes you
// anyway when jumping to a function.
//
//
// utility macros
//
#define VIRTIO_NET_FROM_SNP(SnpPointer) \
CR (SnpPointer, VNET_DEV, Snp, VNET_SIG)
#define VIRTIO_CFG_WRITE(Dev, Field, Value) ((Dev)->VirtIo->WriteDevice ( \
(Dev)->VirtIo, \
OFFSET_OF_VNET (Field), \
SIZE_OF_VNET (Field), \
(Value) \
))
#define VIRTIO_CFG_READ(Dev, Field, Pointer) ((Dev)->VirtIo->ReadDevice ( \
(Dev)->VirtIo, \
OFFSET_OF_VNET (Field), \
SIZE_OF_VNET (Field), \
sizeof *(Pointer), \
(Pointer) \
))
//
// component naming
//
extern EFI_COMPONENT_NAME_PROTOCOL gVirtioNetComponentName;
extern EFI_COMPONENT_NAME2_PROTOCOL gVirtioNetComponentName2;
//
// driver binding
//
extern EFI_DRIVER_BINDING_PROTOCOL gVirtioNetDriverBinding;
//
// member functions implementing the Simple Network Protocol
//
EFI_STATUS
EFIAPI
VirtioNetStart (
IN EFI_SIMPLE_NETWORK_PROTOCOL *This
);
EFI_STATUS
EFIAPI
VirtioNetStop (
IN EFI_SIMPLE_NETWORK_PROTOCOL *This
);
EFI_STATUS
EFIAPI
VirtioNetInitialize (
IN EFI_SIMPLE_NETWORK_PROTOCOL *This,
IN UINTN ExtraRxBufferSize OPTIONAL,
IN UINTN ExtraTxBufferSize OPTIONAL
);
EFI_STATUS
EFIAPI
VirtioNetReset (
IN EFI_SIMPLE_NETWORK_PROTOCOL *This,
IN BOOLEAN ExtendedVerification
);
EFI_STATUS
EFIAPI
VirtioNetShutdown (
IN EFI_SIMPLE_NETWORK_PROTOCOL *This
);
EFI_STATUS
EFIAPI
VirtioNetReceiveFilters (
IN EFI_SIMPLE_NETWORK_PROTOCOL *This,
IN UINT32 Enable,
IN UINT32 Disable,
IN BOOLEAN ResetMCastFilter,
IN UINTN MCastFilterCnt OPTIONAL,
IN EFI_MAC_ADDRESS *MCastFilter OPTIONAL
);
EFI_STATUS
EFIAPI
VirtioNetStationAddress (
IN EFI_SIMPLE_NETWORK_PROTOCOL *This,
IN BOOLEAN Reset,
IN EFI_MAC_ADDRESS *New OPTIONAL
);
EFI_STATUS
EFIAPI
VirtioNetStatistics (
IN EFI_SIMPLE_NETWORK_PROTOCOL *This,
IN BOOLEAN Reset,
IN OUT UINTN *StatisticsSize OPTIONAL,
OUT EFI_NETWORK_STATISTICS *StatisticsTable OPTIONAL
);
EFI_STATUS
EFIAPI
VirtioNetMcastIpToMac (
IN EFI_SIMPLE_NETWORK_PROTOCOL *This,
IN BOOLEAN IPv6,
IN EFI_IP_ADDRESS *Ip,
OUT EFI_MAC_ADDRESS *Mac
);
EFI_STATUS
EFIAPI
VirtioNetNvData (
IN EFI_SIMPLE_NETWORK_PROTOCOL *This,
IN BOOLEAN ReadWrite,
IN UINTN Offset,
IN UINTN BufferSize,
IN OUT VOID *Buffer
);
EFI_STATUS
EFIAPI
VirtioNetGetStatus (
IN EFI_SIMPLE_NETWORK_PROTOCOL *This,
OUT UINT32 *InterruptStatus OPTIONAL,
OUT VOID **TxBuf OPTIONAL
);
EFI_STATUS
EFIAPI
VirtioNetTransmit (
IN EFI_SIMPLE_NETWORK_PROTOCOL *This,
IN UINTN HeaderSize,
IN UINTN BufferSize,
IN /* +OUT! */ VOID *Buffer,
IN EFI_MAC_ADDRESS *SrcAddr OPTIONAL,
IN EFI_MAC_ADDRESS *DestAddr OPTIONAL,
IN UINT16 *Protocol OPTIONAL
);
EFI_STATUS
EFIAPI
VirtioNetReceive (
IN EFI_SIMPLE_NETWORK_PROTOCOL *This,
OUT UINTN *HeaderSize OPTIONAL,
IN OUT UINTN *BufferSize,
OUT VOID *Buffer,
OUT EFI_MAC_ADDRESS *SrcAddr OPTIONAL,
OUT EFI_MAC_ADDRESS *DestAddr OPTIONAL,
OUT UINT16 *Protocol OPTIONAL
);
//
// utility functions shared by various SNP member functions
//
VOID
EFIAPI
VirtioNetShutdownRx (
IN OUT VNET_DEV *Dev
);
VOID
EFIAPI
VirtioNetShutdownTx (
IN OUT VNET_DEV *Dev
);
VOID
EFIAPI
VirtioNetUninitRing (
IN OUT VNET_DEV *Dev,
IN OUT VRING *Ring,
IN VOID *RingMap
);
//
// utility functions to map caller-supplied Tx buffer system physical address
// to a device address and vice versa
//
EFI_STATUS
EFIAPI
VirtioNetMapTxBuf (
IN VNET_DEV *Dev,
IN VOID *Buffer,
IN UINTN NumberOfBytes,
OUT EFI_PHYSICAL_ADDRESS *DeviceAddress
);
EFI_STATUS
EFIAPI
VirtioNetUnmapTxBuf (
IN VNET_DEV *Dev,
OUT VOID **Buffer,
IN EFI_PHYSICAL_ADDRESS DeviceAddress
);
INTN
EFIAPI
VirtioNetTxBufMapInfoCompare (
IN CONST VOID *UserStruct1,
IN CONST VOID *UserStruct2
);
INTN
EFIAPI
VirtioNetTxBufDeviceAddressCompare (
IN CONST VOID *StandaloneKey,
IN CONST VOID *UserStruct
);
//
// event callbacks
//
VOID
EFIAPI
VirtioNetIsPacketAvailable (
IN EFI_EVENT Event,
IN VOID *Context
);
VOID
EFIAPI
VirtioNetExitBoot (
IN EFI_EVENT Event,
IN VOID *Context
);
#endif // _VIRTIO_NET_DXE_H_
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