1 files changed, 504 insertions, 0 deletions
diff --git a/src/drivers/net/efi/mnpnet.c b/src/drivers/net/efi/mnpnet.c
new file mode 100644
index 000000000..a07eae54e
--- /dev/null
+++ b/src/drivers/net/efi/mnpnet.c
@@ -0,0 +1,504 @@
+/*
+ * Copyright (C) 2024 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+/** @file
+ *
+ * MNP NIC driver
+ *
+ */
+
+#include <string.h>
+#include <errno.h>
+#include <ipxe/iobuf.h>
+#include <ipxe/netdevice.h>
+#include <ipxe/ethernet.h>
+#include <ipxe/efi/efi.h>
+#include <ipxe/efi/efi_driver.h>
+#include <ipxe/efi/efi_service.h>
+#include <ipxe/efi/efi_utils.h>
+#include <ipxe/efi/Protocol/ManagedNetwork.h>
+#include "mnpnet.h"
+
+/** An MNP transmit or receive token */
+struct mnp_token {
+	/** MNP completion token */
+	EFI_MANAGED_NETWORK_COMPLETION_TOKEN token;
+	/** Token is owned by MNP */
+	int busy;
+};
+
+/** An MNP NIC */
+struct mnp_nic {
+	/** EFI device */
+	struct efi_device *efidev;
+	/** Managed network protocol */
+	EFI_MANAGED_NETWORK_PROTOCOL *mnp;
+	/** Generic device */
+	struct device dev;
+
+	/** Transmit token */
+	struct mnp_token tx;
+	/** Transmit descriptor */
+	EFI_MANAGED_NETWORK_TRANSMIT_DATA txdata;
+	/** Transmit I/O buffer */
+	struct io_buffer *txbuf;
+
+	/** Receive token */
+	struct mnp_token rx;
+};
+
+/**
+ * Transmit or receive token event
+ *
+ * @v event		Event
+ * @v context		Event context
+ */
+static VOID EFIAPI mnpnet_event ( EFI_EVENT event __unused, VOID *context ) {
+	struct mnp_token *token = context;
+
+	/* Sanity check */
+	assert ( token->busy );
+
+	/* Mark token as no longer owned by MNP */
+	token->busy = 0;
+}
+
+/**
+ * Transmit packet
+ *
+ * @v netdev		Network device
+ * @v iobuf		I/O buffer
+ * @ret rc		Return status code
+ */
+static int mnpnet_transmit ( struct net_device *netdev,
+			     struct io_buffer *iobuf ) {
+	struct mnp_nic *mnp = netdev->priv;
+	struct ll_protocol *ll_protocol = netdev->ll_protocol;
+	EFI_STATUS efirc;
+	int rc;
+
+	/* Do nothing if shutdown is in progress */
+	if ( efi_shutdown_in_progress )
+		return -ECANCELED;
+
+	/* Defer the packet if there is already a transmission in progress */
+	if ( mnp->txbuf ) {
+		netdev_tx_defer ( netdev, iobuf );
+		return 0;
+	}
+
+	/* Construct transmit token */
+	mnp->txdata.DataLength =
+		( iob_len ( iobuf ) - ll_protocol->ll_header_len );
+	mnp->txdata.HeaderLength = ll_protocol->ll_header_len;
+	mnp->txdata.FragmentCount = 1;
+	mnp->txdata.FragmentTable[0].FragmentLength = iob_len ( iobuf );
+	mnp->txdata.FragmentTable[0].FragmentBuffer = iobuf->data;
+	mnp->tx.token.Packet.TxData = &mnp->txdata;
+
+	/* Record as in use */
+	mnp->tx.busy = 1;
+
+	/* Transmit packet */
+	if ( ( efirc = mnp->mnp->Transmit ( mnp->mnp, &mnp->tx.token ) ) != 0 ){
+		rc = -EEFI ( efirc );
+		DBGC ( mnp, "MNP %s could not transmit: %s\n",
+		       netdev->name, strerror ( rc ) );
+		mnp->tx.busy = 0;
+		return rc;
+	}
+
+	/* Record I/O buffer */
+	mnp->txbuf = iobuf;
+
+	return 0;
+}
+
+/**
+ * Refill receive token
+ *
+ * @v netdev		Network device
+ */
+static void mnpnet_refill_rx ( struct net_device *netdev ) {
+	struct mnp_nic *mnp = netdev->priv;
+	EFI_STATUS efirc;
+	int rc;
+
+	/* Do nothing if receive token is still in use */
+	if ( mnp->rx.busy )
+		return;
+
+	/* Mark as in use */
+	mnp->rx.busy = 1;
+
+	/* Queue receive token */
+	if ( ( efirc = mnp->mnp->Receive ( mnp->mnp, &mnp->rx.token ) ) != 0 ) {
+		rc = -EEFI ( efirc );
+		DBGC ( mnp, "MNP %s could not receive: %s\n",
+		       netdev->name, strerror ( rc ) );
+		/* Wait for next refill */
+		mnp->rx.busy = 0;
+		return;
+	}
+}
+
+/**
+ * Poll for completed packets
+ *
+ * @v netdev		Network device
+ */
+static void mnpnet_poll_tx ( struct net_device *netdev ) {
+	struct mnp_nic *mnp = netdev->priv;
+	struct io_buffer *iobuf;
+	EFI_STATUS efirc;
+	int rc;
+
+	/* Do nothing if transmit token is still in use */
+	if ( mnp->tx.busy )
+		return;
+
+	/* Do nothing unless we have a completion */
+	if ( ! mnp->txbuf )
+		return;
+
+	/* Get completion status */
+	efirc = mnp->tx.token.Status;
+	rc = ( efirc ? -EEFI ( efirc ) : 0 );
+
+	/* Complete transmission */
+	iobuf = mnp->txbuf;
+	mnp->txbuf = NULL;
+	netdev_tx_complete_err ( netdev, iobuf, rc );
+}
+
+/**
+ * Poll for received packets
+ *
+ * @v netdev		Network device
+ */
+static void mnpnet_poll_rx ( struct net_device *netdev ) {
+	EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
+	struct mnp_nic *mnp = netdev->priv;
+	EFI_MANAGED_NETWORK_RECEIVE_DATA *rxdata;
+	struct io_buffer *iobuf;
+	size_t len;
+	EFI_STATUS efirc;
+	int rc;
+
+	/* Do nothing unless we have a completion */
+	if ( mnp->rx.busy )
+		return;
+	rxdata = mnp->rx.token.Packet.RxData;
+
+	/* Get completion status */
+	if ( ( efirc = mnp->rx.token.Status ) != 0 ) {
+		rc = -EEFI ( efirc );
+		netdev_rx_err ( netdev, NULL, rc );
+		goto recycle;
+	}
+
+	/* Allocate and fill I/O buffer */
+	len = rxdata->PacketLength;
+	iobuf = alloc_iob ( len );
+	if ( ! iobuf ) {
+		netdev_rx_err ( netdev, NULL, -ENOMEM );
+		goto recycle;
+	}
+	memcpy ( iob_put ( iobuf, len ), rxdata->MediaHeader, len );
+
+	/* Hand off to network stack */
+	netdev_rx ( netdev, iobuf );
+
+ recycle:
+	/* Recycle token */
+	bs->SignalEvent ( rxdata->RecycleEvent );
+}
+
+/**
+ * Poll for completed packets
+ *
+ * @v netdev		Network device
+ */
+static void mnpnet_poll ( struct net_device *netdev ) {
+	struct mnp_nic *mnp = netdev->priv;
+
+	/* Do nothing if shutdown is in progress */
+	if ( efi_shutdown_in_progress )
+		return;
+
+	/* Poll interface */
+	mnp->mnp->Poll ( mnp->mnp );
+
+	/* Process any transmit completions */
+	mnpnet_poll_tx ( netdev );
+
+	/* Process any receive completions */
+	mnpnet_poll_rx ( netdev );
+
+	/* Refill receive token */
+	mnpnet_refill_rx ( netdev );
+}
+
+/**
+ * Open network device
+ *
+ * @v netdev		Network device
+ * @ret rc		Return status code
+ */
+static int mnpnet_open ( struct net_device *netdev ) {
+	EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
+	static EFI_MANAGED_NETWORK_CONFIG_DATA config = {
+		.EnableUnicastReceive = TRUE,
+		.EnableMulticastReceive = TRUE,
+		.EnableBroadcastReceive = TRUE,
+		.EnablePromiscuousReceive = TRUE,
+		.FlushQueuesOnReset = TRUE,
+		.DisableBackgroundPolling = TRUE,
+	};
+	struct mnp_nic *mnp = netdev->priv;
+	EFI_STATUS efirc;
+	int rc;
+
+	/* Create transmit event */
+	if ( ( efirc = bs->CreateEvent ( EVT_NOTIFY_SIGNAL, TPL_NOTIFY,
+					 mnpnet_event, &mnp->tx,
+					 &mnp->tx.token.Event ) ) != 0 ) {
+		rc = -EEFI ( efirc );
+		DBGC ( mnp, "MNP %s could not create TX event: %s\n",
+		       netdev->name, strerror ( rc ) );
+		goto err_tx_event;
+	}
+
+	/* Create receive event */
+	if ( ( efirc = bs->CreateEvent ( EVT_NOTIFY_SIGNAL, TPL_NOTIFY,
+					 mnpnet_event, &mnp->rx,
+					 &mnp->rx.token.Event ) ) != 0 ) {
+		rc = -EEFI ( efirc );
+		DBGC ( mnp, "MNP %s could not create RX event: %s\n",
+		       netdev->name, strerror ( rc ) );
+		goto err_rx_event;
+	}
+
+	/* Configure MNP */
+	if ( ( efirc = mnp->mnp->Configure ( mnp->mnp, &config ) ) != 0 ) {
+		rc = -EEFI ( efirc );
+		DBGC ( mnp, "MNP %s could not configure: %s\n",
+		       netdev->name, strerror ( rc ) );
+		goto err_configure;
+	}
+
+	/* Refill receive token */
+	mnpnet_refill_rx ( netdev );
+
+	return 0;
+
+	mnp->mnp->Configure ( mnp->mnp, NULL );
+ err_configure:
+	bs->CloseEvent ( mnp->rx.token.Event );
+ err_rx_event:
+	bs->CloseEvent ( mnp->tx.token.Event );
+ err_tx_event:
+	return rc;
+}
+
+/**
+ * Close network device
+ *
+ * @v netdev		Network device
+ */
+static void mnpnet_close ( struct net_device *netdev ) {
+	EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
+	struct mnp_nic *mnp = netdev->priv;
+
+	/* Reset MNP (unless whole system shutdown is in progress) */
+	if ( ! efi_shutdown_in_progress )
+		mnp->mnp->Configure ( mnp->mnp, NULL );
+
+	/* Close events */
+	bs->CloseEvent ( mnp->rx.token.Event );
+	bs->CloseEvent ( mnp->tx.token.Event );
+
+	/* Reset tokens */
+	mnp->tx.busy = 0;
+	mnp->rx.busy = 0;
+
+	/* Discard any incomplete I/O buffer */
+	if ( mnp->txbuf ) {
+		netdev_tx_complete_err ( netdev, mnp->txbuf, -ECANCELED );
+		mnp->txbuf = NULL;
+	}
+}
+
+/** MNP network device operations */
+static struct net_device_operations mnpnet_operations = {
+	.open = mnpnet_open,
+	.close = mnpnet_close,
+	.transmit = mnpnet_transmit,
+	.poll = mnpnet_poll,
+};
+
+/**
+ * Attach driver to device
+ *
+ * @v efidev		EFI device
+ * @ret rc		Return status code
+ */
+int mnpnet_start ( struct efi_device *efidev ) {
+	EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
+	EFI_HANDLE device = efidev->device;
+	EFI_GUID *binding = &efi_managed_network_service_binding_protocol_guid;
+	EFI_SIMPLE_NETWORK_MODE mode;
+	union {
+		EFI_MANAGED_NETWORK_PROTOCOL *mnp;
+		void *interface;
+	} u;
+	struct net_device *netdev;
+	struct mnp_nic *mnp;
+	EFI_STATUS efirc;
+	int rc;
+
+	/* Allocate and initalise structure */
+	netdev = alloc_etherdev ( sizeof ( *mnp ) );
+	if ( ! netdev ) {
+		rc = -ENOMEM;
+		goto err_alloc;
+	}
+	netdev_init ( netdev, &mnpnet_operations );
+	mnp = netdev->priv;
+	mnp->efidev = efidev;
+	efidev_set_drvdata ( efidev, netdev );
+
+	/* Populate underlying device information */
+	efi_device_info ( device, "MNP", &mnp->dev );
+	mnp->dev.driver_name = "MNP";
+	mnp->dev.parent = &efidev->dev;
+	list_add ( &mnp->dev.siblings, &efidev->dev.children );
+	INIT_LIST_HEAD ( &mnp->dev.children );
+	netdev->dev = &mnp->dev;
+
+	/* Create MNP child */
+	if ( ( rc = efi_service_add ( device, binding,
+				      &efidev->child ) ) != 0 ) {
+		DBGC ( mnp, "MNP %s could not create child: %s\n",
+		       efi_handle_name ( device ), strerror ( rc ) );
+		goto err_service;
+	}
+
+	/* Open MNP protocol */
+	if ( ( efirc = bs->OpenProtocol ( efidev->child,
+					  &efi_managed_network_protocol_guid,
+					  &u.interface, efi_image_handle,
+					  efidev->child,
+					  ( EFI_OPEN_PROTOCOL_BY_DRIVER |
+					    EFI_OPEN_PROTOCOL_EXCLUSIVE )))!=0){
+		rc = -EEFI ( efirc );
+		DBGC ( mnp, "MNP %s could not open MNP protocol: %s\n",
+		       efi_handle_name ( device ), strerror ( rc ) );
+		goto err_open;
+	}
+	mnp->mnp = u.mnp;
+
+	/* Get configuration */
+	efirc = mnp->mnp->GetModeData ( mnp->mnp, NULL, &mode );
+	if ( ( efirc != 0 ) && ( efirc != EFI_NOT_STARTED ) ) {
+		rc = -EEFI ( efirc );
+		DBGC ( mnp, "MNP %s could not get mode data: %s\n",
+		       efi_handle_name ( device ), strerror ( rc ) );
+		goto err_mode;
+	}
+
+	/* Populate network device parameters */
+	if ( mode.HwAddressSize != netdev->ll_protocol->hw_addr_len ) {
+		DBGC ( device, "MNP %s has invalid hardware address length "
+		       "%d\n", efi_handle_name ( device ), mode.HwAddressSize );
+		rc = -ENOTSUP;
+		goto err_hw_addr_len;
+	}
+	memcpy ( netdev->hw_addr, &mode.PermanentAddress,
+		 netdev->ll_protocol->hw_addr_len );
+	if ( mode.HwAddressSize != netdev->ll_protocol->ll_addr_len ) {
+		DBGC ( device, "MNP %s has invalid link-layer address length "
+		       "%d\n", efi_handle_name ( device ), mode.HwAddressSize );
+		rc = -ENOTSUP;
+		goto err_ll_addr_len;
+	}
+	memcpy ( netdev->ll_addr, &mode.CurrentAddress,
+		 netdev->ll_protocol->ll_addr_len );
+
+	/* Register network device */
+	if ( ( rc = register_netdev ( netdev ) ) != 0 )
+		goto err_register;
+	DBGC ( mnp, "MNP %s registered as %s\n",
+	       efi_handle_name ( device ), netdev->name );
+
+	/* Mark as link up: we don't handle link state */
+	netdev_link_up ( netdev );
+
+	return 0;
+
+	unregister_netdev ( netdev );
+ err_register:
+ err_ll_addr_len:
+ err_hw_addr_len:
+ err_mode:
+	bs->CloseProtocol ( efidev->child, &efi_managed_network_protocol_guid,
+			    efi_image_handle, efidev->child );
+ err_open:
+	efi_service_del ( device, binding, efidev->child );
+ err_service:
+	list_del ( &mnp->dev.siblings );
+	netdev_nullify ( netdev );
+	netdev_put ( netdev );
+ err_alloc:
+	return rc;
+}
+
+/**
+ * Detach driver from device
+ *
+ * @v efidev		EFI device
+  */
+void mnpnet_stop ( struct efi_device *efidev ) {
+	EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
+	EFI_GUID *binding = &efi_managed_network_service_binding_protocol_guid;
+	struct net_device *netdev = efidev_get_drvdata ( efidev );
+	struct mnp_nic *mnp = netdev->priv;
+
+	/* Unregister network device */
+	unregister_netdev ( netdev );
+
+	/* Close MNP protocol */
+	bs->CloseProtocol ( efidev->child, &efi_managed_network_protocol_guid,
+			    efi_image_handle, efidev->child );
+
+	/* Remove MNP child (unless whole system shutdown is in progress) */
+	if ( ! efi_shutdown_in_progress )
+		efi_service_del ( efidev->device, binding, efidev->child );
+
+	/* Free network device */
+	list_del ( &mnp->dev.siblings );
+	netdev_nullify ( netdev );
+	netdev_put ( netdev );
+}