/** @file Driver Binding code and its private helpers for the virtio-net driver. Copyright (c) 2021, Oracle and/or its affiliates. Copyright (C) 2013, Red Hat, Inc. Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent **/ #include #include #include #include #include #include "E1kNet.h" #define RECEIVE_FILTERS_NO_MCAST ((UINT32) ( \ EFI_SIMPLE_NETWORK_RECEIVE_UNICAST | \ EFI_SIMPLE_NETWORK_RECEIVE_BROADCAST | \ EFI_SIMPLE_NETWORK_RECEIVE_PROMISCUOUS \ )) STATIC EFI_STATUS E1kNetEepromRead ( IN E1K_NET_DEV *Dev, IN UINT8 Offset, OUT UINT16 *Data ) { EFI_STATUS Status; UINT32 RegEerd = 0; Status = E1kNetRegWrite32(Dev, E1K_REG_EERD, ((UINT32)Offset << 8) | E1K_REG_EERD_START); if (EFI_ERROR (Status)) return Status; // Wait for the read to complete while ( !EFI_ERROR (Status) && !(RegEerd & E1K_REG_EERD_DONE)) { gBS->Stall(1); Status = E1kNetRegRead32(Dev, E1K_REG_EERD, &RegEerd); } if (!EFI_ERROR(Status)) *Data = E1K_REG_EERD_DATA_GET(RegEerd); return Status; } STATIC EFI_STATUS E1kNetMacAddrRead ( IN E1K_NET_DEV *Dev ) { EFI_STATUS Status; UINT8 i; for (i = 0; i < 3; i++) { UINT16 MacAddr; Status = E1kNetEepromRead (Dev, i, &MacAddr); if (EFI_ERROR (Status)) return Status; Dev->Snm.CurrentAddress.Addr[i * 2] = MacAddr & 0xff; Dev->Snm.CurrentAddress.Addr[i * 2 + 1] = (MacAddr >> 8) & 0xff; } return Status; } /** Set up the Simple Network Protocol fields, the Simple Network Mode fields, and the Exit Boot Services Event of the virtio-net driver instance. This function may only be called by E1kNetDriverBindingStart(). @param[in,out] Dev The E1K_NET_DEV driver instance being created for the e1000 device. @return Status codes from the CreateEvent(). @retval EFI_SUCCESS Configuration successful. */ STATIC EFI_STATUS EFIAPI E1kNetSnpPopulate ( IN OUT E1K_NET_DEV *Dev ) { UINT32 RegSts; EFI_STATUS Status; // // We set up a function here that is asynchronously callable by an // external application to check if there are any packets available for // reception. The least urgent task priority level we can specify for such a // "software interrupt" is TPL_CALLBACK. // // TPL_CALLBACK is also the maximum TPL an SNP implementation is allowed to // run at (see 6.1 Event, Timer, and Task Priority Services in the UEFI // Specification 2.3.1+errC). // // Since we raise our TPL to TPL_CALLBACK in every single function that // accesses the device, and the external application also queues its interest // for received packets at the same TPL_CALLBACK, in effect the // E1kNetIsPacketAvailable() function will never interrupt any // device-accessing driver function, it will be scheduled in isolation. // // TPL_CALLBACK (which basically this entire driver runs at) is allowed // for "[l]ong term operations (such as file system operations and disk // I/O)". Because none of our functions block, we'd satisfy an even stronger // requirement. // Status = gBS->CreateEvent (EVT_NOTIFY_WAIT, TPL_CALLBACK, &E1kNetIsPacketAvailable, Dev, &Dev->Snp.WaitForPacket); if (EFI_ERROR (Status)) { return Status; } Dev->Snp.Revision = EFI_SIMPLE_NETWORK_PROTOCOL_REVISION; Dev->Snp.Start = &E1kNetStart; Dev->Snp.Stop = &E1kNetStop; Dev->Snp.Initialize = &E1kNetInitialize; Dev->Snp.Reset = &E1kNetReset; Dev->Snp.Shutdown = &E1kNetShutdown; Dev->Snp.ReceiveFilters = &E1kNetReceiveFilters; Dev->Snp.StationAddress = &E1kNetStationAddress; Dev->Snp.Statistics = &E1kNetStatistics; Dev->Snp.MCastIpToMac = &E1kNetMcastIpToMac; Dev->Snp.NvData = &E1kNetNvData; Dev->Snp.GetStatus = &E1kNetGetStatus; Dev->Snp.Transmit = &E1kNetTransmit; Dev->Snp.Receive = &E1kNetReceive; Dev->Snp.Mode = &Dev->Snm; Dev->Snm.State = EfiSimpleNetworkStopped; Dev->Snm.HwAddressSize = sizeof (E1K_NET_MAC); Dev->Snm.MediaHeaderSize = sizeof (E1K_NET_MAC) + // dst MAC sizeof (E1K_NET_MAC) + // src MAC 2; // Ethertype Dev->Snm.MaxPacketSize = 1500; Dev->Snm.NvRamSize = 0; Dev->Snm.NvRamAccessSize = 0; Dev->Snm.ReceiveFilterMask = RECEIVE_FILTERS_NO_MCAST; Dev->Snm.ReceiveFilterSetting = RECEIVE_FILTERS_NO_MCAST; Dev->Snm.MaxMCastFilterCount = 0; Dev->Snm.MCastFilterCount = 0; Dev->Snm.IfType = 1; // ethernet Dev->Snm.MacAddressChangeable = FALSE; Dev->Snm.MultipleTxSupported = TRUE; ASSERT (sizeof (E1K_NET_MAC) <= sizeof (EFI_MAC_ADDRESS)); Dev->Snm.MediaPresentSupported = TRUE; Status = E1kNetRegRead32(Dev, E1K_REG_STATUS, &RegSts); if (EFI_ERROR (Status)) { goto CloseWaitForPacket; } Dev->Snm.MediaPresent = (BOOLEAN)((RegSts & E1K_REG_STATUS_LU) != 0); Status = E1kNetMacAddrRead(Dev); CopyMem (&Dev->Snm.PermanentAddress, &Dev->Snm.CurrentAddress, sizeof (E1K_NET_MAC)); SetMem (&Dev->Snm.BroadcastAddress, sizeof (E1K_NET_MAC), 0xFF); // // E1kNetExitBoot() is queued by ExitBootServices(); its purpose is to // cancel any pending requests. The TPL_CALLBACK reasoning is // identical to the one above. There's one difference: this kind of // event is "globally visible", which means it can be signalled as soon as // we create it. We haven't raised our TPL here, hence E1kNetExitBoot() // could be entered immediately. E1kNetExitBoot() checks Dev->Snm.State, // so we're safe. // Status = gBS->CreateEvent (EVT_SIGNAL_EXIT_BOOT_SERVICES, TPL_CALLBACK, &E1kNetExitBoot, Dev, &Dev->ExitBoot); if (EFI_ERROR (Status)) { goto CloseWaitForPacket; } return EFI_SUCCESS; CloseWaitForPacket: gBS->CloseEvent (Dev->Snp.WaitForPacket); return Status; } /** Release any resources allocated by E1kNetSnpPopulate(). This function may only be called by E1kNetDriverBindingStart(), when rolling back a partial, failed driver instance creation, and by E1kNetDriverBindingStop(), when disconnecting a virtio-net device from the driver. @param[in,out] Dev The E1K_NET_DEV driver instance being destroyed. */ STATIC VOID EFIAPI E1kNetSnpEvacuate ( IN OUT E1K_NET_DEV *Dev ) { // // This function runs either at TPL_CALLBACK already (from // E1kNetDriverBindingStop()), or it is part of a teardown following // a partial, failed construction in E1kNetDriverBindingStart(), when // WaitForPacket was never accessible to the world. // gBS->CloseEvent (Dev->ExitBoot); gBS->CloseEvent (Dev->Snp.WaitForPacket); } /** Tests to see if this driver supports a given controller. If a child device is provided, it further tests to see if this driver supports creating a handle for the specified child device. This function checks to see if the driver specified by This supports the device specified by ControllerHandle. Drivers will typically use the device path attached to ControllerHandle and/or the services from the bus I/O abstraction attached to ControllerHandle to determine if the driver supports ControllerHandle. This function may be called many times during platform initialization. In order to reduce boot times, the tests performed by this function must be very small, and take as little time as possible to execute. This function must not change the state of any hardware devices, and this function must be aware that the device specified by ControllerHandle may already be managed by the same driver or a different driver. This function must match its calls to AllocatePages() with FreePages(), AllocatePool() with FreePool(), and OpenProtocol() with CloseProtocol(). Because ControllerHandle may have been previously started by the same driver, if a protocol is already in the opened state, then it must not be closed with CloseProtocol(). This is required to guarantee the state of ControllerHandle is not modified by this function. @param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance. @param[in] ControllerHandle The handle of the controller to test. This handle must support a protocol interface that supplies an I/O abstraction to the driver. @param[in] RemainingDevicePath A pointer to the remaining portion of a device path. This parameter is ignored by device drivers, and is optional for bus drivers. For bus drivers, if this parameter is not NULL, then the bus driver must determine if the bus controller specified by ControllerHandle and the child controller specified by RemainingDevicePath are both supported by this bus driver. @retval EFI_SUCCESS The device specified by ControllerHandle and RemainingDevicePath is supported by the driver specified by This. @retval EFI_ALREADY_STARTED The device specified by ControllerHandle and RemainingDevicePath is already being managed by the driver specified by This. @retval EFI_ACCESS_DENIED The device specified by ControllerHandle and RemainingDevicePath is already being managed by a different driver or an application that requires exclusive access. Currently not implemented. @retval EFI_UNSUPPORTED The device specified by ControllerHandle and RemainingDevicePath is not supported by the driver specified by This. **/ STATIC EFI_STATUS EFIAPI E1kNetDriverBindingSupported ( IN EFI_DRIVER_BINDING_PROTOCOL *This, IN EFI_HANDLE ControllerHandle, IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath OPTIONAL ) { EFI_STATUS Status; EFI_PCI_IO_PROTOCOL *PciIo; PCI_TYPE00 Pci; Status = gBS->OpenProtocol ( ControllerHandle, &gEfiPciIoProtocolGuid, (VOID **)&PciIo, This->DriverBindingHandle, ControllerHandle, EFI_OPEN_PROTOCOL_BY_DRIVER ); if (EFI_ERROR (Status)) { return Status; } Status = PciIo->Pci.Read ( PciIo, EfiPciIoWidthUint32, 0, sizeof (Pci) / sizeof (UINT32), &Pci ); if (EFI_ERROR (Status)) { goto Done; } if (Pci.Hdr.VendorId == INTEL_PCI_VENDOR_ID && (Pci.Hdr.DeviceId == INTEL_82540EM_PCI_DEVICE_ID || Pci.Hdr.DeviceId == INTEL_82543GC_PCI_DEVICE_ID || Pci.Hdr.DeviceId == INTEL_82545EM_PCI_DEVICE_ID)) { Status = EFI_SUCCESS; } else { Status = EFI_UNSUPPORTED; } Done: gBS->CloseProtocol ( ControllerHandle, &gEfiPciIoProtocolGuid, This->DriverBindingHandle, ControllerHandle ); return Status; } /** Starts a device controller or a bus controller. The Start() function is designed to be invoked from the EFI boot service ConnectController(). As a result, much of the error checking on the parameters to Start() has been moved into this common boot service. It is legal to call Start() from other locations, but the following calling restrictions must be followed, or the system behavior will not be deterministic. 1. ControllerHandle must be a valid EFI_HANDLE. 2. If RemainingDevicePath is not NULL, then it must be a pointer to a naturally aligned EFI_DEVICE_PATH_PROTOCOL. 3. Prior to calling Start(), the Supported() function for the driver specified by This must have been called with the same calling parameters, and Supported() must have returned EFI_SUCCESS. @param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance. @param[in] ControllerHandle The handle of the controller to start. This handle must support a protocol interface that supplies an I/O abstraction to the driver. @param[in] RemainingDevicePath A pointer to the remaining portion of a device path. This parameter is ignored by device drivers, and is optional for bus drivers. For a bus driver, if this parameter is NULL, then handles for all the children of Controller are created by this driver. If this parameter is not NULL and the first Device Path Node is not the End of Device Path Node, then only the handle for the child device specified by the first Device Path Node of RemainingDevicePath is created by this driver. If the first Device Path Node of RemainingDevicePath is the End of Device Path Node, no child handle is created by this driver. @retval EFI_SUCCESS The device was started. @retval EFI_DEVICE_ERROR The device could not be started due to a device error.Currently not implemented. @retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources. @retval Others The driver failed to start the device. **/ STATIC EFI_STATUS EFIAPI E1kNetDriverBindingStart ( IN EFI_DRIVER_BINDING_PROTOCOL *This, IN EFI_HANDLE ControllerHandle, IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath OPTIONAL ) { EFI_STATUS Status; E1K_NET_DEV *Dev; EFI_DEVICE_PATH_PROTOCOL *DevicePath; MAC_ADDR_DEVICE_PATH MacNode; DEBUG((DEBUG_INFO, "E1kNetControllerStart:\n")); Dev = AllocateZeroPool (sizeof (*Dev)); if (Dev == NULL) { return EFI_OUT_OF_RESOURCES; } Dev->Signature = E1K_NET_DEV_SIGNATURE; Status = gBS->OpenProtocol ( ControllerHandle, &gEfiPciIoProtocolGuid, (VOID **)&Dev->PciIo, This->DriverBindingHandle, ControllerHandle, EFI_OPEN_PROTOCOL_BY_DRIVER ); if (EFI_ERROR (Status)) { goto FreePool; } Status = Dev->PciIo->Attributes ( Dev->PciIo, EfiPciIoAttributeOperationGet, 0, &Dev->OriginalPciAttributes ); if (EFI_ERROR (Status)) { goto CloseProtocol; } // // Enable I/O Space & Bus-Mastering // Status = Dev->PciIo->Attributes ( Dev->PciIo, EfiPciIoAttributeOperationEnable, (EFI_PCI_IO_ATTRIBUTE_IO | EFI_PCI_IO_ATTRIBUTE_BUS_MASTER), NULL ); if (EFI_ERROR (Status)) { goto CloseProtocol; } // // Signal device supports 64-bit DMA addresses // Status = Dev->PciIo->Attributes ( Dev->PciIo, EfiPciIoAttributeOperationEnable, EFI_PCI_IO_ATTRIBUTE_DUAL_ADDRESS_CYCLE, NULL ); if (EFI_ERROR (Status)) { // // Warn user that device will only be using 32-bit DMA addresses. // // Note that this does not prevent the device/driver from working // and therefore we only warn and continue as usual. // DEBUG (( DEBUG_WARN, "%a: failed to enable 64-bit DMA addresses\n", __FUNCTION__ )); } DEBUG((DEBUG_INFO, "E1kNetControllerStart: Resetting NIC\n")); Status = E1kNetDevReset (Dev); if (EFI_ERROR (Status)) { goto RestoreAttributes; } // // now we can run a basic one-shot e1000 initialization required to // retrieve the MAC address // DEBUG((DEBUG_INFO, "E1kNetControllerStart: Populating SNP interface\n")); Status = E1kNetSnpPopulate (Dev); if (EFI_ERROR (Status)) { goto UninitDev; } // // get the device path of the e1000 device -- one-shot open // Status = gBS->OpenProtocol (ControllerHandle, &gEfiDevicePathProtocolGuid, (VOID **)&DevicePath, This->DriverBindingHandle, ControllerHandle, EFI_OPEN_PROTOCOL_GET_PROTOCOL); if (EFI_ERROR (Status)) { goto Evacuate; } // // create another device path that has the MAC address appended // MacNode.Header.Type = MESSAGING_DEVICE_PATH; MacNode.Header.SubType = MSG_MAC_ADDR_DP; SetDevicePathNodeLength (&MacNode, sizeof MacNode); CopyMem (&MacNode.MacAddress, &Dev->Snm.CurrentAddress, sizeof (EFI_MAC_ADDRESS)); MacNode.IfType = Dev->Snm.IfType; Dev->MacDevicePath = AppendDevicePathNode (DevicePath, &MacNode.Header); if (Dev->MacDevicePath == NULL) { Status = EFI_OUT_OF_RESOURCES; goto Evacuate; } // // create a child handle with the Simple Network Protocol and the new // device path installed on it // Status = gBS->InstallMultipleProtocolInterfaces (&Dev->MacHandle, &gEfiSimpleNetworkProtocolGuid, &Dev->Snp, &gEfiDevicePathProtocolGuid, Dev->MacDevicePath, NULL); if (EFI_ERROR (Status)) { goto FreeMacDevicePath; } DEBUG((DEBUG_INFO, "E1kNetControllerStart: returns EFI_SUCCESS\n")); return EFI_SUCCESS; FreeMacDevicePath: FreePool (Dev->MacDevicePath); Evacuate: E1kNetSnpEvacuate (Dev); UninitDev: E1kNetDevReset (Dev); RestoreAttributes: Dev->PciIo->Attributes ( Dev->PciIo, EfiPciIoAttributeOperationSet, Dev->OriginalPciAttributes, NULL ); CloseProtocol: gBS->CloseProtocol ( ControllerHandle, &gEfiPciIoProtocolGuid, This->DriverBindingHandle, ControllerHandle ); FreePool: FreePool (Dev); DEBUG((DEBUG_INFO, "E1kNetControllerStart: returns %u\n", Status)); return Status; } /** Stops a device controller or a bus controller. The Stop() function is designed to be invoked from the EFI boot service DisconnectController(). As a result, much of the error checking on the parameters to Stop() has been moved into this common boot service. It is legal to call Stop() from other locations, but the following calling restrictions must be followed, or the system behavior will not be deterministic. 1. ControllerHandle must be a valid EFI_HANDLE that was used on a previous call to this same driver's Start() function. 2. The first NumberOfChildren handles of ChildHandleBuffer must all be a valid EFI_HANDLE. In addition, all of these handles must have been created in this driver's Start() function, and the Start() function must have called OpenProtocol() on ControllerHandle with an Attribute of EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER. @param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance. @param[in] ControllerHandle A handle to the device being stopped. The handle must support a bus specific I/O protocol for the driver to use to stop the device. @param[in] NumberOfChildren The number of child device handles in ChildHandleBuffer. @param[in] ChildHandleBuffer An array of child handles to be freed. May be NULL if NumberOfChildren is 0. @retval EFI_SUCCESS The device was stopped. @retval EFI_DEVICE_ERROR The device could not be stopped due to a device error. **/ STATIC EFI_STATUS EFIAPI E1kNetDriverBindingStop ( IN EFI_DRIVER_BINDING_PROTOCOL *This, IN EFI_HANDLE ControllerHandle, IN UINTN NumberOfChildren, IN EFI_HANDLE *ChildHandleBuffer ) { if (NumberOfChildren > 0) { // // free all resources for whose access we need the child handle, because // the child handle is going away // EFI_STATUS Status; EFI_SIMPLE_NETWORK_PROTOCOL *Snp; E1K_NET_DEV *Dev; EFI_TPL OldTpl; ASSERT (NumberOfChildren == 1); Status = gBS->OpenProtocol (ChildHandleBuffer[0], &gEfiSimpleNetworkProtocolGuid, (VOID **)&Snp, This->DriverBindingHandle, ControllerHandle, EFI_OPEN_PROTOCOL_GET_PROTOCOL); ASSERT_EFI_ERROR (Status); Dev = E1K_NET_FROM_SNP (Snp); // // prevent any interference with WaitForPacket // OldTpl = gBS->RaiseTPL (TPL_CALLBACK); ASSERT (Dev->MacHandle == ChildHandleBuffer[0]); if (Dev->Snm.State != EfiSimpleNetworkStopped) { // // device in use, cannot stop driver instance // Status = EFI_DEVICE_ERROR; } else { gBS->UninstallMultipleProtocolInterfaces (Dev->MacHandle, &gEfiDevicePathProtocolGuid, Dev->MacDevicePath, &gEfiSimpleNetworkProtocolGuid, &Dev->Snp, NULL); FreePool (Dev->MacDevicePath); E1kNetSnpEvacuate (Dev); Dev->PciIo->Attributes ( Dev->PciIo, EfiPciIoAttributeOperationSet, Dev->OriginalPciAttributes, NULL ); gBS->CloseProtocol ( ControllerHandle, &gEfiPciIoProtocolGuid, This->DriverBindingHandle, ControllerHandle ); FreePool (Dev); } gBS->RestoreTPL (OldTpl); return Status; } return EFI_SUCCESS; } EFI_DRIVER_BINDING_PROTOCOL gE1kNetDriverBinding = { &E1kNetDriverBindingSupported, &E1kNetDriverBindingStart, &E1kNetDriverBindingStop, 0x10, NULL, NULL };