/*
* Copyright (C) 2014 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.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <stdlib.h>
#include <stdio.h>
#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/Protocol/SimpleNetwork.h>
#include <ipxe/efi/efi_driver.h>
#include <ipxe/efi/efi_pci.h>
#include "snpnet.h"
/** @file
*
* SNP NIC driver
*
*/
/** An SNP NIC */
struct snp_nic {
/** EFI device */
struct efi_device *efidev;
/** Simple network protocol */
EFI_SIMPLE_NETWORK_PROTOCOL *snp;
/** Generic device */
struct device dev;
/** Maximum packet size
*
* This is calculated as the sum of MediaHeaderSize and
* MaxPacketSize, and may therefore be an overestimate.
*/
size_t mtu;
/** Current transmit buffer */
struct io_buffer *txbuf;
/** Current receive buffer */
struct io_buffer *rxbuf;
};
/** Maximum number of received packets per poll */
#define SNP_RX_QUOTA 4
/** EFI simple network protocol GUID */
static EFI_GUID efi_simple_network_protocol_guid
= EFI_SIMPLE_NETWORK_PROTOCOL_GUID;
/** EFI PCI I/O protocol GUID */
static EFI_GUID efi_pci_io_protocol_guid
= EFI_PCI_IO_PROTOCOL_GUID;
/**
* Check link state
*
* @v netdev Network device
*/
static void snpnet_check_link ( struct net_device *netdev ) {
struct snp_nic *snp = netdev_priv ( netdev );
EFI_SIMPLE_NETWORK_MODE *mode = snp->snp->Mode;
/* Do nothing unless media presence detection is supported */
if ( ! mode->MediaPresentSupported )
return;
/* Report any link status change */
if ( mode->MediaPresent && ( ! netdev_link_ok ( netdev ) ) ) {
netdev_link_up ( netdev );
} else if ( ( ! mode->MediaPresent ) && netdev_link_ok ( netdev ) ) {
netdev_link_down ( netdev );
}
}
/**
* Transmit packet
*
* @v netdev Network device
* @v iobuf I/O buffer
* @ret rc Return status code
*/
static int snpnet_transmit ( struct net_device *netdev,
struct io_buffer *iobuf ) {
struct snp_nic *snp = netdev_priv ( netdev );
EFI_STATUS efirc;
int rc;
/* Defer the packet if there is already a transmission in progress */
if ( snp->txbuf ) {
netdev_tx_defer ( netdev, iobuf );
return 0;
}
/* Transmit packet */
if ( ( efirc = snp->snp->Transmit ( snp->snp, 0, iob_len ( iobuf ),
iobuf->data, NULL, NULL,
NULL ) ) != 0 ) {
rc = -EEFI ( efirc );
DBGC ( snp, "SNP %s could not transmit: %s\n",
netdev->name, strerror ( rc ) );
return rc;
}
snp->txbuf = iobuf;
return 0;
}
/**
* Poll for completed packets
*
* @v netdev Network device
*/
static void snpnet_poll_tx ( struct net_device *netdev ) {
struct snp_nic *snp = netdev->priv;
UINT32 irq;
VOID *txbuf;
EFI_STATUS efirc;
int rc;
/* Get status */
if ( ( efirc = snp->snp->GetStatus ( snp->snp, &irq, &txbuf ) ) != 0 ) {
rc = -EEFI ( efirc );
DBGC ( snp, "SNP %s could not get status: %s\n",
netdev->name, strerror ( rc ) );
netdev_rx_err ( netdev, NULL, rc );
return;
}
/* Do nothing unless we have a completion */
if ( ! txbuf )
return;
/* Sanity check */
if ( ! snp->txbuf ) {
DBGC ( snp, "SNP %s reported spurious TX completion\n",
netdev->name );
netdev_tx_err ( netdev, NULL, -EPIPE );
return;
}
/* Complete transmission */
netdev_tx_complete ( netdev, snp->txbuf );
snp->txbuf = NULL;
}
/**
* Poll for received packets
*
* @v netdev Network device
*/
static void snpnet_poll_rx ( struct net_device *netdev ) {
struct snp_nic *snp = netdev->priv;
UINTN len;
unsigned int quota;
EFI_STATUS efirc;
int rc;
/* Retrieve up to SNP_RX_QUOTA packets */
for ( quota = SNP_RX_QUOTA ; quota ; quota-- ) {
/* Allocate buffer, if required */
if ( ! snp->rxbuf ) {
snp->rxbuf = alloc_iob ( snp->mtu );
if ( ! snp->rxbuf ) {
/* Leave for next poll */
break;
}
}
/* Receive packet */
len = iob_tailroom ( snp->rxbuf );
if ( ( efirc = snp->snp->Receive ( snp->snp, NULL, &len,
snp->rxbuf->data, NULL,
NULL, NULL ) ) != 0 ) {
/* EFI_NOT_READY is just the usual "no packet"
* status indication; ignore it.
*/
if ( efirc == EFI_NOT_READY )
break;
/* Anything else is an error */
rc = -EEFI ( efirc );
DBGC ( snp, "SNP %s could not receive: %s\n",
netdev->name, strerror ( rc ) );
netdev_rx_err ( netdev, NULL, rc );
break;
}
/* Hand off to network stack */
iob_put ( snp->rxbuf, len );
netdev_rx ( netdev, snp->rxbuf );
snp->rxbuf = NULL;
}
}
/**
* Poll for completed packets
*
* @v netdev Network device
*/
static void snpnet_poll ( struct net_device *netdev ) {
/* Process any TX completions */
snpnet_poll_tx ( netdev );
/* Process any RX completions */
snpnet_poll_rx ( netdev );
/* Check for link state changes */
snpnet_check_link ( netdev );
}
/**
* Open network device
*
* @v netdev Network device
* @ret rc Return status code
*/
static int snpnet_open ( struct net_device *netdev ) {
struct snp_nic *snp = netdev->priv;
EFI_MAC_ADDRESS *mac = ( ( void * ) netdev->ll_addr );
UINT32 filters;
EFI_STATUS efirc;
int rc;
/* Try setting MAC address (before initialising) */
if ( ( efirc = snp->snp->StationAddress ( snp->snp, FALSE, mac ) ) !=0){
rc = -EEFI ( efirc );
DBGC ( snp, "SNP %s could not set station address before "
"initialising: %s\n", netdev->name, strerror ( rc ) );
/* Ignore error */
}
/* Initialise NIC */
if ( ( efirc = snp->snp->Initialize ( snp->snp, 0, 0 ) ) != 0 ) {
rc = -EEFI ( efirc );
DBGC ( snp, "SNP %s could not initialise: %s\n",
netdev->name, strerror ( rc ) );
return rc;
}
/* Try setting MAC address (after initialising) */
if ( ( efirc = snp->snp->StationAddress ( snp->snp, FALSE, mac ) ) !=0){
rc = -EEFI ( efirc );
DBGC ( snp, "SNP %s could not set station address after "
"initialising: %s\n", netdev->name, strerror ( rc ) );
/* Ignore error */
}
/* Set receive filters */
filters = ( EFI_SIMPLE_NETWORK_RECEIVE_UNICAST |
EFI_SIMPLE_NETWORK_RECEIVE_MULTICAST |
EFI_SIMPLE_NETWORK_RECEIVE_BROADCAST |
EFI_SIMPLE_NETWORK_RECEIVE_PROMISCUOUS |
EFI_SIMPLE_NETWORK_RECEIVE_PROMISCUOUS_MULTICAST );
if ( ( efirc = snp->snp->ReceiveFilters ( snp->snp, filters, 0, FALSE,
0, NULL ) ) != 0 ) {
rc = -EEFI ( efirc );
DBGC ( snp, "SNP %s could not set receive filters: %s\n",
netdev->name, strerror ( rc ) );
/* Ignore error */
}
return 0;
}
/**
* Close network device
*
* @v netdev Network device
*/
static void snpnet_close ( struct net_device *netdev ) {
struct snp_nic *snp = netdev->priv;
EFI_STATUS efirc;
int rc;
/* Shut down NIC */
if ( ( efirc = snp->snp->Shutdown ( snp->snp ) ) != 0 ) {
rc = -EEFI ( efirc );
DBGC ( snp, "SNP %s could not shut down: %s\n",
netdev->name, strerror ( rc ) );
/* Nothing we can do about this */
}
/* Discard transmit buffer, if applicable */
if ( snp->txbuf ) {
netdev_tx_complete_err ( netdev, snp->txbuf, -ECANCELED );
snp->txbuf = NULL;
}
/* Discard receive buffer, if applicable */
if ( snp->rxbuf ) {
free_iob ( snp->rxbuf );
snp->rxbuf = NULL;
}
}
/** SNP network device operations */
static struct net_device_operations snpnet_operations = {
.open = snpnet_open,
.close = snpnet_close,
.transmit = snpnet_transmit,
.poll = snpnet_poll,
};
/**
* Get underlying PCI device information
*
* @v efidev EFI device
* @v dev Generic device to fill in
* @ret rc Return status code
*/
static int snpnet_pci_info ( struct efi_device *efidev, struct device *dev ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
EFI_DEVICE_PATH_PROTOCOL *devpath = efidev->path;
struct pci_device pci;
EFI_HANDLE device;
EFI_STATUS efirc;
int rc;
/* Check for presence of PCI I/O protocol */
if ( ( efirc = bs->LocateDevicePath ( &efi_pci_io_protocol_guid,
&devpath, &device ) ) != 0 ) {
DBGC ( efidev->device, "SNP %p %s is not a PCI device\n",
efidev->device, efi_devpath_text ( efidev->path ) );
return -EEFI ( efirc );
}
/* Get PCI device information */
if ( ( rc = efipci_info ( device, &pci ) ) != 0 ) {
DBGC ( efidev->device, "SNP %p %s could not get PCI "
"information: %s\n", efidev->device,
efi_devpath_text ( efidev->path ), strerror ( rc ) );
return rc;
}
/* Populate SNP device information */
memcpy ( &dev->desc, &pci.dev.desc, sizeof ( dev->desc ) );
snprintf ( dev->name, sizeof ( dev->name ), "SNP-%s", pci.dev.name );
return 0;
}
/**
* Get underlying device information
*
* @v efidev EFI device
* @v dev Generic device to fill in
* @ret rc Return status code
*/
static int snpnet_dev_info ( struct efi_device *efidev, struct device *dev ) {
int rc;
/* Try getting underlying PCI device information */
if ( ( rc = snpnet_pci_info ( efidev, dev ) ) == 0 )
return 0;
DBGC ( efidev->device, "SNP %p %s could not get underlying device "
"information\n", efidev->device,
efi_devpath_text ( efidev->path ) );
return -ENOTTY;
}
/**
* Attach driver to device
*
* @v efidev EFI device
* @ret rc Return status code
*/
int snpnet_start ( struct efi_device *efidev ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
EFI_HANDLE device = efidev->device;
EFI_SIMPLE_NETWORK_MODE *mode;
struct net_device *netdev;
struct snp_nic *snp;
void *interface;
EFI_STATUS efirc;
int rc;
/* Open SNP protocol */
if ( ( efirc = bs->OpenProtocol ( device,
&efi_simple_network_protocol_guid,
&interface, efi_image_handle, device,
( EFI_OPEN_PROTOCOL_BY_DRIVER |
EFI_OPEN_PROTOCOL_EXCLUSIVE )))!=0){
rc = -EEFI ( efirc );
DBGC ( device, "SNP %p %s cannot open SNP protocol: %s\n",
device, efi_devpath_text ( efidev->path ),
strerror ( rc ) );
goto err_open_protocol;
}
/* Allocate and initialise structure */
netdev = alloc_etherdev ( sizeof ( *snp ) );
if ( ! netdev ) {
rc = -ENOMEM;
goto err_alloc;
}
netdev_init ( netdev, &snpnet_operations );
snp = netdev->priv;
snp->efidev = efidev;
snp->snp = interface;
mode = snp->snp->Mode;
efidev_set_drvdata ( efidev, netdev );
/* Populate underlying device information */
if ( ( rc = snpnet_dev_info ( efidev, &snp->dev ) ) != 0 )
goto err_info;
snp->dev.driver_name = "SNP";
snp->dev.parent = &efidev->dev;
list_add ( &snp->dev.siblings, &efidev->dev.children );
INIT_LIST_HEAD ( &snp->dev.children );
netdev->dev = &snp->dev;
/* Bring to the Started state */
if ( ( mode->State == EfiSimpleNetworkStopped ) &&
( ( efirc = snp->snp->Start ( snp->snp ) ) != 0 ) ) {
rc = -EEFI ( efirc );
DBGC ( device, "SNP %p %s could not start: %s\n", device,
efi_devpath_text ( efidev->path ), strerror ( rc ) );
goto err_start;
}
if ( ( mode->State == EfiSimpleNetworkInitialized ) &&
( ( efirc = snp->snp->Shutdown ( snp->snp ) ) != 0 ) ) {
rc = -EEFI ( efirc );
DBGC ( device, "SNP %p %s could not shut down: %s\n", device,
efi_devpath_text ( efidev->path ), strerror ( rc ) );
goto err_shutdown;
}
/* Populate network device parameters */
if ( mode->HwAddressSize != netdev->ll_protocol->hw_addr_len ) {
DBGC ( device, "SNP %p %s has invalid hardware address "
"length %d\n", device, efi_devpath_text ( efidev->path ),
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, "SNP %p %s has invalid link-layer address "
"length %d\n", device, efi_devpath_text ( efidev->path ),
mode->HwAddressSize );
rc = -ENOTSUP;
goto err_ll_addr_len;
}
memcpy ( netdev->ll_addr, &mode->CurrentAddress,
netdev->ll_protocol->ll_addr_len );
snp->mtu = ( snp->snp->Mode->MaxPacketSize +
snp->snp->Mode->MediaHeaderSize );
/* Register network device */
if ( ( rc = register_netdev ( netdev ) ) != 0 )
goto err_register_netdev;
DBGC ( device, "SNP %p %s registered as %s\n", device,
efi_devpath_text ( efidev->path ), netdev->name );
/* Set initial link state */
if ( snp->snp->Mode->MediaPresentSupported ) {
snpnet_check_link ( netdev );
} else {
netdev_link_up ( netdev );
}
return 0;
unregister_netdev ( netdev );
err_register_netdev:
err_ll_addr_len:
err_hw_addr_len:
err_shutdown:
err_start:
list_del ( &snp->dev.siblings );
err_info:
netdev_nullify ( netdev );
netdev_put ( netdev );
err_alloc:
bs->CloseProtocol ( device, &efi_simple_network_protocol_guid,
efi_image_handle, device );
err_open_protocol:
return rc;
}
/**
* Detach driver from device
*
* @v efidev EFI device
*/
void snpnet_stop ( struct efi_device *efidev ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
struct net_device *netdev = efidev_get_drvdata ( efidev );
struct snp_nic *snp = netdev->priv;
EFI_STATUS efirc;
int rc;
/* Unregister network device */
unregister_netdev ( netdev );
/* Stop SNP protocol */
if ( ( efirc = snp->snp->Stop ( snp->snp ) ) != 0 ) {
rc = -EEFI ( efirc );
DBGC ( efidev->device, "SNP %p %s could not stop: %s\n",
efidev->device, efi_devpath_text ( efidev->path ),
strerror ( rc ) );
/* Nothing we can do about this */
}
/* Free network device */
list_del ( &snp->dev.siblings );
netdev_nullify ( netdev );
netdev_put ( netdev );
/* Close SNP protocol */
bs->CloseProtocol ( efidev->device, &efi_simple_network_protocol_guid,
efi_image_handle, efidev->device );
}
