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[efi] Rewrite SNP NIC driver 

Rewrite the SNP NIC driver to use non-blocking and deferrable
transmissions, to provide link status detection, to provide
information about the underlying (PCI) hardware device, and to avoid
unnecessary I/O buffer allocations during receive polling.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2014-07-04 16:52:10 +01:00
parent 56b2f66dd2
commit d0cfbd01f5
5 changed files with 421 additions and 513 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

146
src/drivers/net/efi/snp.c
View File

@ -19,17 +19,12 @@
FILE_LICENCE ( GPL2_OR_LATER );
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <ipxe/efi/efi.h>
#include <ipxe/efi/Protocol/SimpleNetwork.h>
#include <ipxe/efi/efi_driver.h>
#include <ipxe/efi/efi_snp.h>
#include <ipxe/efi/efi_pci.h>
#include "snpnet.h"
#include "snp.h"
/** @file
*
@ -41,10 +36,6 @@ FILE_LICENCE ( GPL2_OR_LATER );
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 to see if driver supports a device
*
@ -77,143 +68,10 @@ static int snp_supported ( EFI_HANDLE device ) {
return 0;
}
/**
* Get underlying PCI device information
*
* @v snpdev SNP device
* @ret rc Return status code
*/
static int snp_pci_info ( struct snp_device *snpdev ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
struct efi_device *efidev = snpdev->efidev;
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 ( &snpdev->dev.desc, &pci.dev.desc, sizeof ( snpdev->dev.desc ));
snprintf ( snpdev->dev.name, sizeof ( snpdev->dev.name ), "SNP-%s",
pci.dev.name );
return 0;
}
/**
* Attach driver to device
*
* @v efidev EFI device
* @ret rc Return status code
*/
static int snp_start ( struct efi_device *efidev ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
EFI_HANDLE device = efidev->device;
struct snp_device *snpdev;
union {
EFI_SIMPLE_NETWORK_PROTOCOL *snp;
void *interface;
} snp;
EFI_STATUS efirc;
int rc;
/* Check that this is not a device we are providing ourselves */
if ( find_snpdev ( efidev->device ) != NULL ) {
DBGCP ( device, "SNP %p %s is provided by this binary\n",
device, efi_devpath_text ( efidev->path ) );
rc = -ENOTTY;
goto err_own;
}
/* Allocate and initialise structure */
snpdev = zalloc ( sizeof ( *snpdev ) );
if ( ! snpdev ) {
rc = -ENOMEM;
goto err_alloc;
}
snpdev->efidev = efidev;
snpdev->dev.driver_name = "SNP";
INIT_LIST_HEAD ( &snpdev->dev.children );
/* See if device is an SNP device */
if ( ( efirc = bs->OpenProtocol ( device,
&efi_simple_network_protocol_guid,
&snp.interface, efi_image_handle,
device,
( EFI_OPEN_PROTOCOL_BY_DRIVER |
EFI_OPEN_PROTOCOL_EXCLUSIVE )))!=0){
rc = -EEFI ( efirc );
DBGCP ( device, "SNP %p %s cannot open SNP protocol: %s\n",
device, efi_devpath_text ( efidev->path ),
strerror ( rc ) );
goto err_open_protocol;
}
snpdev->snp = snp.snp;
/* Get underlying device information */
if ( ( rc = snp_pci_info ( snpdev ) ) != 0 )
goto err_info;
/* Mark SNP device as a child of the EFI device */
snpdev->dev.parent = &efidev->dev;
list_add ( &snpdev->dev.siblings, &efidev->dev.children );
/* Create SNP network device */
if ( ( rc = snpnet_probe ( snpdev ) ) != 0 )
goto err_probe;
efidev_set_drvdata ( efidev, snpdev );
return 0;
snpnet_remove ( snpdev );
err_probe:
list_del ( &snpdev->dev.siblings );
err_info:
bs->CloseProtocol ( device, &efi_simple_network_protocol_guid,
efi_image_handle, device );
err_open_protocol:
free ( snpdev );
err_alloc:
err_own:
return rc;
}
/**
* Detach driver from device
*
* @v efidev EFI device
*/
static void snp_stop ( struct efi_device *efidev ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
struct snp_device *snpdev = efidev_get_drvdata ( efidev );
snpnet_remove ( snpdev );
list_del ( &snpdev->dev.siblings );
bs->CloseProtocol ( efidev->device, &efi_simple_network_protocol_guid,
efi_image_handle, efidev->device );
free ( snpdev );
}
/** EFI SNP driver */
struct efi_driver snp_driver __efi_driver ( EFI_DRIVER_NORMAL ) = {
.name = "SNP",
.supported = snp_supported,
.start = snp_start,
.stop = snp_stop,
.start = snpnet_start,
.stop = snpnet_stop,
};

48
src/drivers/net/efi/snp.h
View File

@ -1,48 +0,0 @@
/*
* Copyright (C) 2010 VMware, Inc. All Rights Reserved.
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef _SNP_H
#define _SNP_H
/** @file
*
* SNP driver
*
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <ipxe/device.h>
#include <ipxe/efi/efi.h>
#include <ipxe/efi/Protocol/SimpleNetwork.h>
/** An SNP device */
struct snp_device {
/** EFI device */
struct efi_device *efidev;
/** Simple network protocol */
EFI_SIMPLE_NETWORK_PROTOCOL *snp;
/** Generic device */
struct device dev;
/** Network device */
struct net_device *netdev;
/** State to restore when removing the device */
UINT32 removal_state;
};
#endif /* _SNP_H */

602
src/drivers/net/efi/snpnet.c
View File

@ -1,5 +1,5 @@
/*
* Copyright (C) 2010 VMware, Inc. All Rights Reserved.
* 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
@ -13,38 +13,85 @@
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA.
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ipxe/io.h>
#include <errno.h>
#include <ipxe/iobuf.h>
#include <ipxe/netdevice.h>
#include <ipxe/if_ether.h>
#include <ipxe/ethernet.h>
#include <ipxe/efi/efi.h>
#include <ipxe/efi/Protocol/SimpleNetwork.h>
#include "snp.h"
#include <ipxe/efi/efi_driver.h>
#include <ipxe/efi/efi_pci.h>
#include "snpnet.h"
/** @file
*
* SNP network device driver
* SNP NIC driver
*
*/
/** SNP net device structure */
struct snpnet_device {
/** The underlying simple network protocol */
/** 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;
/** State that the SNP should be in after close */
UINT32 close_state;
/** 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
*
@ -54,297 +101,438 @@ struct snpnet_device {
*/
static int snpnet_transmit ( struct net_device *netdev,
struct io_buffer *iobuf ) {
struct snpnet_device *snpnetdev = netdev->priv;
EFI_SIMPLE_NETWORK_PROTOCOL *snp = snpnetdev->snp;
void *txbuf=NULL;
size_t len = iob_len ( iobuf );
struct snp_nic *snp = netdev_priv ( netdev );
EFI_STATUS efirc;
int rc;
if ( ( efirc = snp->Transmit ( snp, 0, len, iobuf->data, NULL, NULL,
NULL ) ) != 0 ) {
return -EEFI ( efirc );
/* Defer the packet if there is already a transmission in progress */
if ( snp->txbuf ) {
netdev_tx_defer ( netdev, iobuf );
return 0;
}
/* since GetStatus is so inconsistent, don't try more than one outstanding transmit at a time */
while ( txbuf == NULL ) {
if ( ( efirc = snp->GetStatus ( snp, NULL, &txbuf ) ) != 0 ) {
rc = -EEFI ( efirc );
DBGC ( snp, "SNP %p could not get status %s\n", snp,
strerror ( rc ) );
break;
}
/* 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;
}
netdev_tx_complete ( netdev, iobuf );
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 ( struct net_device *netdev ) {
struct snpnet_device *snpnetdev = netdev->priv;
EFI_SIMPLE_NETWORK_PROTOCOL *snp = snpnetdev->snp;
struct io_buffer *iobuf = NULL;
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;
/* Process received packets */
while ( 1 ) {
/* The spec is not clear if the max packet size refers to the
* payload or the entire packet including headers. The Receive
* function needs a buffer large enough to contain the headers,
* and potentially a 4-byte CRC and 4-byte VLAN tag (?), so add
* some breathing room.
*/
len = snp->Mode->MaxPacketSize + ETH_HLEN + 8;
iobuf = alloc_iob ( len );
if ( iobuf == NULL ) {
netdev_rx_err ( netdev, NULL, -ENOMEM );
break;
/* 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;
}
}
efirc = snp->Receive ( snp, NULL, &len, iobuf->data,
NULL, NULL, NULL );
/* Receive packet */
len = iob_tailroom ( snp->rxbuf );
if ( ( efirc = snp->snp->Receive ( snp->snp, NULL, &len,
snp->rxbuf->data, NULL,
NULL, NULL ) ) != 0 ) {
/* No packets left? */
if ( efirc == EFI_NOT_READY ) {
free_iob ( iobuf );
break;
}
/* EFI_NOT_READY is just the usual "no packet"
* status indication; ignore it.
*/
if ( efirc == EFI_NOT_READY )
break;
/* Other error? */
if ( efirc != 0 ) {
/* Anything else is an error */
rc = -EEFI ( efirc );
DBGC ( snp, "SNP %p receive packet error: %s "
"(len was %zd, is now %zd)\n",
snp, strerror ( rc ), iob_len(iobuf),
(size_t)len );
netdev_rx_err ( netdev, iobuf, rc );
DBGC ( snp, "SNP %s could not receive: %s\n",
netdev->name, strerror ( rc ) );
netdev_rx_err ( netdev, NULL, rc );
break;
}
/* Packet is valid, deliver it */
iob_put ( iobuf, len );
netdev_rx ( netdev, iob_disown ( iobuf ) );
/* Hand off to network stack */
iob_put ( snp->rxbuf, len );
netdev_rx ( netdev, snp->rxbuf );
snp->rxbuf = NULL;
}
}
/**
* Open NIC
* Poll for completed packets
*
* @v netdev Net device
* @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 snpnet_device *snpnetdev = netdev->priv;
EFI_SIMPLE_NETWORK_PROTOCOL *snp = snpnetdev->snp;
EFI_MAC_ADDRESS *mac;
UINT32 enableFlags, disableFlags;
struct snp_nic *snp = netdev->priv;
EFI_MAC_ADDRESS *mac = ( ( void * ) netdev->ll_addr );
UINT32 filters;
EFI_STATUS efirc;
int rc;
snpnetdev->close_state = snp->Mode->State;
if ( snp->Mode->State != EfiSimpleNetworkInitialized ) {
if ( ( efirc = snp->Initialize ( snp, 0, 0 ) ) != 0 ) {
rc = -EEFI ( efirc );
DBGC ( snp, "SNP %p could not initialize: %s\n",
snp, strerror ( rc ) );
return rc;
}
}
/* Use the default MAC address */
mac = ( ( void * ) netdev->ll_addr );
if ( ( efirc = snp->StationAddress ( snp, FALSE, mac ) ) != 0 ) {
/* Try setting MAC address (before initialising) */
if ( ( efirc = snp->snp->StationAddress ( snp->snp, FALSE, mac ) ) !=0){
rc = -EEFI ( efirc );
DBGC ( snp, "SNP %p could not reset station address: %s\n",
snp, strerror ( rc ) );
DBGC ( snp, "SNP %s could not set station address before "
"initialising: %s\n", netdev->name, strerror ( rc ) );
/* Ignore error */
}
/* Set up receive filters to receive unicast and broadcast packets
* always. Also, enable either promiscuous multicast (if possible) or
* promiscuous operation, in order to catch all multicast packets.
*/
enableFlags = snp->Mode->ReceiveFilterMask &
( EFI_SIMPLE_NETWORK_RECEIVE_UNICAST |
EFI_SIMPLE_NETWORK_RECEIVE_BROADCAST );
disableFlags = snp->Mode->ReceiveFilterMask &
( EFI_SIMPLE_NETWORK_RECEIVE_MULTICAST |
EFI_SIMPLE_NETWORK_RECEIVE_PROMISCUOUS |
EFI_SIMPLE_NETWORK_RECEIVE_PROMISCUOUS_MULTICAST );
if ( snp->Mode->ReceiveFilterMask &
EFI_SIMPLE_NETWORK_RECEIVE_PROMISCUOUS_MULTICAST ) {
enableFlags |= EFI_SIMPLE_NETWORK_RECEIVE_PROMISCUOUS_MULTICAST;
} else if ( snp->Mode->ReceiveFilterMask &
EFI_SIMPLE_NETWORK_RECEIVE_PROMISCUOUS ) {
enableFlags |= EFI_SIMPLE_NETWORK_RECEIVE_PROMISCUOUS;
}
disableFlags &= ~enableFlags;
if ( ( efirc = snp->ReceiveFilters ( snp, enableFlags, disableFlags,
FALSE, 0, NULL ) ) != 0 ) {
/* Initialise NIC */
if ( ( efirc = snp->snp->Initialize ( snp->snp, 0, 0 ) ) != 0 ) {
rc = -EEFI ( efirc );
DBGC ( snp, "SNP %p could not set receive filters: %s\n",
snp, strerror ( rc ) );
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 */
}
DBGC ( snp, "SNP %p opened\n", snp );
return 0;
}
/**
* Close NIC
* Close network device
*
* @v netdev Net device
* @v netdev Network device
*/
static void snpnet_close ( struct net_device *netdev ) {
struct snpnet_device *snpnetdev = netdev->priv;
EFI_SIMPLE_NETWORK_PROTOCOL *snp = snpnetdev->snp;
struct snp_nic *snp = netdev->priv;
EFI_STATUS efirc;
int rc;
if ( snpnetdev->close_state != EfiSimpleNetworkInitialized ) {
if ( ( efirc = snp->Shutdown ( snp ) ) != 0 ) {
rc = -EEFI ( efirc );
DBGC ( snp, "SNP %p could not shut down: %s\n",
snp, strerror ( 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 */
}
}
/**
* Enable/disable interrupts
*
* @v netdev Net device
* @v enable Interrupts should be enabled
*/
static void snpnet_irq ( struct net_device *netdev, int enable ) {
struct snpnet_device *snpnetdev = netdev->priv;
EFI_SIMPLE_NETWORK_PROTOCOL *snp = snpnetdev->snp;
/* Discard transmit buffer, if applicable */
if ( snp->txbuf ) {
netdev_tx_complete_err ( netdev, snp->txbuf, -ECANCELED );
snp->txbuf = NULL;
}
/* On EFI, interrupts are never necessary. (This function is only
* required for BIOS PXE.) If interrupts were required, they could be
* simulated using a fast timer.
*/
DBGC ( snp, "SNP %p cannot %s interrupts\n",
snp, ( enable ? "enable" : "disable" ) );
/* 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,
.irq = snpnet_irq,
.open = snpnet_open,
.close = snpnet_close,
.transmit = snpnet_transmit,
.poll = snpnet_poll,
};
/**
* Probe SNP device
* Get underlying PCI device information
*
* @v snpdev SNP device
* @v efidev EFI device
* @v dev Generic device to fill in
* @ret rc Return status code
*/
int snpnet_probe ( struct snp_device *snpdev ) {
EFI_SIMPLE_NETWORK_PROTOCOL *snp = snpdev->snp;
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;
struct net_device *netdev;
struct snpnet_device *snpnetdev;
int rc;
DBGC ( snp, "SNP %p probing...\n", snp );
/* 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 );
}
/* Allocate net device */
netdev = alloc_etherdev ( sizeof ( struct snpnet_device ) );
if ( ! netdev )
return -ENOMEM;
/* 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 );
netdev->dev = &snpdev->dev;
snpdev->netdev = netdev;
snpnetdev = netdev->priv;
snpnetdev->snp = snp;
snpdev->removal_state = snp->Mode->State;
snp = netdev->priv;
snp->efidev = efidev;
snp->snp = interface;
mode = snp->snp->Mode;
efidev_set_drvdata ( efidev, netdev );
/* Start the interface */
if ( snp->Mode->State == EfiSimpleNetworkStopped ) {
if ( ( efirc = snp->Start ( snp ) ) != 0 ) {
rc = -EEFI ( efirc );
DBGC ( snp, "SNP %p could not start: %s\n", snp,
strerror ( rc ) );
goto err_start;
}
/* 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;
}
if ( snp->Mode->HwAddressSize > sizeof ( netdev->hw_addr ) ) {
DBGC ( snp, "SNP %p hardware address is too large\n", snp );
rc = -EINVAL;
goto err_hwaddr;
/* 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, snp->Mode->PermanentAddress.Addr,
snp->Mode->HwAddressSize );
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;
goto err_register_netdev;
DBGC ( device, "SNP %p %s registered as %s\n", device,
efi_devpath_text ( efidev->path ), netdev->name );
/* Mark as link up; we don't handle link state */
netdev_link_up ( netdev );
/* Set initial link state */
if ( snp->snp->Mode->MediaPresentSupported ) {
snpnet_check_link ( netdev );
} else {
netdev_link_up ( netdev );
}
DBGC ( snp, "SNP %p added\n", snp );
return 0;
err_register:
err_hwaddr:
if ( snpdev->removal_state == EfiSimpleNetworkStopped )
snp->Stop ( snp );
err_start:
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 );
snpdev->netdev = NULL;
err_alloc:
bs->CloseProtocol ( device, &efi_simple_network_protocol_guid,
efi_image_handle, device );
err_open_protocol:
return rc;
}
/**
* Remove SNP device
* Detach driver from device
*
* @v snpdev SNP device
*/
void snpnet_remove ( struct snp_device *snpdev ) {
EFI_SIMPLE_NETWORK_PROTOCOL *snp = snpdev->snp;
struct net_device *netdev = snpdev->netdev;
* @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;
if ( snp->Mode->State == EfiSimpleNetworkInitialized &&
snpdev->removal_state != EfiSimpleNetworkInitialized ) {
DBGC ( snp, "SNP %p shutting down\n", snp );
if ( ( efirc = snp->Shutdown ( snp ) ) != 0 ) {
rc = -EEFI ( efirc );
DBGC ( snp, "SNP %p could not shut down: %s\n",
snp, strerror ( rc ) );
}
}
if ( snp->Mode->State == EfiSimpleNetworkStarted &&
snpdev->removal_state == EfiSimpleNetworkStopped ) {
DBGC ( snp, "SNP %p stopping\n", snp );
if ( ( efirc = snp->Stop ( snp ) ) != 0 ) {
rc = -EEFI ( efirc );
DBGC ( snp, "SNP %p could not be stopped: %s\n",
snp, strerror ( rc ) );
}
}
/* Unregister net device */
/* 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 );
DBGC ( snp, "SNP %p removed\n", snp );
/* Close SNP protocol */
bs->CloseProtocol ( efidev->device, &efi_simple_network_protocol_guid,
efi_image_handle, efidev->device );
}

26
src/drivers/net/efi/snpnet.h
View File

@ -1,35 +1,17 @@
/*
* Copyright (C) 2010 VMware, Inc. All Rights Reserved.
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef _SNPNET_H
#define _SNPNET_H
/** @file
*
* EFI Simple Network Protocol network device driver
* SNP NIC driver
*
*/
FILE_LICENCE ( GPL2_OR_LATER );
struct snp_device;
struct efi_device;
extern int snpnet_probe ( struct snp_device *snpdev );
extern void snpnet_remove ( struct snp_device *snpdev );
extern int snpnet_start ( struct efi_device *efidev );
extern void snpnet_stop ( struct efi_device *efidev );
#endif /* _SNPNET_H */

112
src/drivers/net/efi/snponly.c
View File

@ -1,5 +1,5 @@
/*
* Copyright (C) 2010 VMware, Inc. All Rights Reserved.
* 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
@ -13,117 +13,45 @@
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA.
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <string.h>
#include <errno.h>
#include <ipxe/device.h>
#include <ipxe/init.h>
#include <ipxe/efi/efi.h>
#include <ipxe/efi/Protocol/SimpleNetwork.h>
#include "snp.h"
#include <ipxe/efi/efi_driver.h>
#include "snpnet.h"
/** @file
*
* Chain-loading Simple Network Protocol Bus Driver
* SNP chainloaded-device-only driver
*
* This bus driver allows iPXE to use the EFI Simple Network Protocol provided
* by the platform to transmit and receive packets. It attaches to only the
* device handle that iPXE was loaded from, that is, it will only use the
* Simple Network Protocol on the current loaded image's device handle.
*
* Eseentially, this driver provides the EFI equivalent of the "undionly"
* driver.
*/
/** The one and only SNP network device */
static struct snp_device snponly_dev;
/** EFI simple network protocol GUID */
static EFI_GUID efi_simple_network_protocol_guid
= EFI_SIMPLE_NETWORK_PROTOCOL_GUID;
/**
* Probe SNP root bus
* Check to see if driver supports a device
*
* @v rootdev SNP bus root device
*
* Look at the loaded image's device handle and see if the simple network
* protocol exists. If so, register a driver for it.
* @v device EFI device handle
* @ret rc Return status code
*/
static int snpbus_probe ( struct root_device *rootdev ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
EFI_STATUS efirc;
int rc;
void *snp;
static int snponly_supported ( EFI_HANDLE device ) {
efirc = bs->OpenProtocol ( efi_loaded_image->DeviceHandle,
&efi_simple_network_protocol_guid,
&snp, efi_image_handle, NULL,
EFI_OPEN_PROTOCOL_GET_PROTOCOL );
if ( efirc ) {
DBG ( "Could not find Simple Network Protocol!\n" );
return -ENODEV;
}
snponly_dev.snp = snp;
/* Check that this device is our loaded image's device */
if ( device != efi_loaded_image->DeviceHandle )
return -ENOTTY;
/* Add to device hierarchy */
strncpy ( snponly_dev.dev.name, "EFI SNP",
( sizeof ( snponly_dev.dev.name ) - 1 ) );
snponly_dev.dev.parent = &rootdev->dev;
list_add ( &snponly_dev.dev.siblings, &rootdev->dev.children);
INIT_LIST_HEAD ( &snponly_dev.dev.children );
/* Create network device */
if ( ( rc = snpnet_probe ( &snponly_dev ) ) != 0 )
goto err;
DBGC ( device, "SNP %p %s is the SNP chainloading device\n",
device, efi_handle_devpath_text ( device ) );
return 0;
err:
list_del ( &snponly_dev.dev.siblings );
return rc;
}
/**
* Remove SNP root bus
*
* @v rootdev SNP bus root device
*/
static void snpbus_remove ( struct root_device *rootdev __unused ) {
snpnet_remove ( &snponly_dev );
list_del ( &snponly_dev.dev.siblings );
}
/** SNP bus root device driver */
static struct root_driver snp_root_driver = {
.probe = snpbus_probe,
.remove = snpbus_remove,
};
/** SNP bus root device */
struct root_device snp_root_device __root_device = {
.dev = { .name = "EFI SNP" },
.driver = &snp_root_driver,
};
/**
* Prepare for exit
*
* @v booting System is shutting down for OS boot
*/
static void snponly_shutdown ( int booting ) {
/* If we are shutting down to boot an OS, make sure the SNP does not
* stay active.
*/
if ( booting )
snponly_dev.removal_state = EfiSimpleNetworkStopped;
}
struct startup_fn startup_snponly __startup_fn ( STARTUP_LATE ) = {
.shutdown = snponly_shutdown,
/** EFI SNP driver */
struct efi_driver snponly_driver __efi_driver ( EFI_DRIVER_NORMAL ) = {
.name = "SNPONLY",
.supported = snponly_supported,
.start = snpnet_start,
.stop = snpnet_stop,
};