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opengnsys_ipxe/src/interface/efi/efi_snp.c

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/*
* Copyright (C) 2008 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include <byteswap.h>
#include <ipxe/netdevice.h>
#include <ipxe/iobuf.h>
#include <ipxe/in.h>
#include <ipxe/pci.h>
#include <ipxe/efi/efi.h>
#include <ipxe/efi/efi_pci.h>
#include <ipxe/efi/efi_driver.h>
#include <ipxe/efi/efi_strings.h>
#include <ipxe/efi/Protocol/SimpleNetwork.h>
#include <ipxe/efi/Protocol/NetworkInterfaceIdentifier.h>
#include <ipxe/efi/Protocol/DevicePath.h>
/** @file
*
* iPXE EFI SNP interface
*
*/
/** An SNP device */
struct efi_snp_device {
/** List of SNP devices */
struct list_head list;
/** The underlying iPXE network device */
struct net_device *netdev;
/** The underlying EFI PCI device */
struct efi_pci_device *efipci;
/** EFI device handle */
EFI_HANDLE handle;
/** The SNP structure itself */
EFI_SIMPLE_NETWORK_PROTOCOL snp;
/** The SNP "mode" (parameters) */
EFI_SIMPLE_NETWORK_MODE mode;
/** Outstanding TX packet count (via "interrupt status")
*
* Used in order to generate TX completions.
*/
unsigned int tx_count_interrupts;
/** Outstanding TX packet count (via "recycled tx buffers")
*
* Used in order to generate TX completions.
*/
unsigned int tx_count_txbufs;
/** Outstanding RX packet count (via "interrupt status") */
unsigned int rx_count_interrupts;
/** Outstanding RX packet count (via WaitForPacket event) */
unsigned int rx_count_events;
/** The network interface identifier */
EFI_NETWORK_INTERFACE_IDENTIFIER_PROTOCOL nii;
/** Device name */
wchar_t name[ sizeof ( ( ( struct net_device * ) NULL )->name ) ];
/** The device path
*
* This field is variable in size and must appear at the end
* of the structure.
*/
EFI_DEVICE_PATH_PROTOCOL path;
};
/** EFI simple network protocol GUID */
static EFI_GUID efi_simple_network_protocol_guid
= EFI_SIMPLE_NETWORK_PROTOCOL_GUID;
/** EFI device path protocol GUID */
static EFI_GUID efi_device_path_protocol_guid
= EFI_DEVICE_PATH_PROTOCOL_GUID;
/** EFI network interface identifier GUID */
static EFI_GUID efi_nii_protocol_guid
= EFI_NETWORK_INTERFACE_IDENTIFIER_PROTOCOL_GUID;
/** EFI network interface identifier GUID (extra special version) */
static EFI_GUID efi_nii31_protocol_guid = {
/* At some point, it seems that someone decided to change the
* GUID. Current EFI builds ignore the older GUID, older EFI
* builds ignore the newer GUID, so we have to expose both.
*/
0x1ACED566, 0x76ED, 0x4218,
{ 0xBC, 0x81, 0x76, 0x7F, 0x1F, 0x97, 0x7A, 0x89 }
};
/** List of SNP devices */
static LIST_HEAD ( efi_snp_devices );
/**
* Set EFI SNP mode based on iPXE net device parameters
*
* @v snp SNP interface
*/
static void efi_snp_set_mode ( struct efi_snp_device *snpdev ) {
struct net_device *netdev = snpdev->netdev;
EFI_SIMPLE_NETWORK_MODE *mode = &snpdev->mode;
struct ll_protocol *ll_protocol = netdev->ll_protocol;
unsigned int ll_addr_len = ll_protocol->ll_addr_len;
mode->HwAddressSize = ll_addr_len;
mode->MediaHeaderSize = ll_protocol->ll_header_len;
mode->MaxPacketSize = netdev->max_pkt_len;
mode->ReceiveFilterMask = ( EFI_SIMPLE_NETWORK_RECEIVE_UNICAST |
EFI_SIMPLE_NETWORK_RECEIVE_MULTICAST |
EFI_SIMPLE_NETWORK_RECEIVE_BROADCAST );
assert ( ll_addr_len <= sizeof ( mode->CurrentAddress ) );
memcpy ( &mode->CurrentAddress, netdev->ll_addr, ll_addr_len );
memcpy ( &mode->BroadcastAddress, netdev->ll_broadcast, ll_addr_len );
ll_protocol->init_addr ( netdev->hw_addr, &mode->PermanentAddress );
mode->IfType = ntohs ( ll_protocol->ll_proto );
mode->MacAddressChangeable = TRUE;
mode->MediaPresentSupported = TRUE;
mode->MediaPresent = ( netdev_link_ok ( netdev ) ? TRUE : FALSE );
}
/**
* Poll net device and count received packets
*
* @v snpdev SNP device
*/
static void efi_snp_poll ( struct efi_snp_device *snpdev ) {
struct io_buffer *iobuf;
unsigned int before = 0;
unsigned int after = 0;
unsigned int arrived;
/* We have to report packet arrivals, and this is the easiest
* way to fake it.
*/
list_for_each_entry ( iobuf, &snpdev->netdev->rx_queue, list )
before++;
netdev_poll ( snpdev->netdev );
list_for_each_entry ( iobuf, &snpdev->netdev->rx_queue, list )
after++;
arrived = ( after - before );
snpdev->rx_count_interrupts += arrived;
snpdev->rx_count_events += arrived;
}
/**
* Change SNP state from "stopped" to "started"
*
* @v snp SNP interface
* @ret efirc EFI status code
*/
static EFI_STATUS EFIAPI
efi_snp_start ( EFI_SIMPLE_NETWORK_PROTOCOL *snp ) {
struct efi_snp_device *snpdev =
container_of ( snp, struct efi_snp_device, snp );
DBGC2 ( snpdev, "SNPDEV %p START\n", snpdev );
snpdev->mode.State = EfiSimpleNetworkStarted;
return 0;
}
/**
* Change SNP state from "started" to "stopped"
*
* @v snp SNP interface
* @ret efirc EFI status code
*/
static EFI_STATUS EFIAPI
efi_snp_stop ( EFI_SIMPLE_NETWORK_PROTOCOL *snp ) {
struct efi_snp_device *snpdev =
container_of ( snp, struct efi_snp_device, snp );
DBGC2 ( snpdev, "SNPDEV %p STOP\n", snpdev );
snpdev->mode.State = EfiSimpleNetworkStopped;
return 0;
}
/**
* Open the network device
*
* @v snp SNP interface
* @v extra_rx_bufsize Extra RX buffer size, in bytes
* @v extra_tx_bufsize Extra TX buffer size, in bytes
* @ret efirc EFI status code
*/
static EFI_STATUS EFIAPI
efi_snp_initialize ( EFI_SIMPLE_NETWORK_PROTOCOL *snp,
UINTN extra_rx_bufsize, UINTN extra_tx_bufsize ) {
struct efi_snp_device *snpdev =
container_of ( snp, struct efi_snp_device, snp );
int rc;
DBGC2 ( snpdev, "SNPDEV %p INITIALIZE (%ld extra RX, %ld extra TX)\n",
snpdev, ( ( unsigned long ) extra_rx_bufsize ),
( ( unsigned long ) extra_tx_bufsize ) );
if ( ( rc = netdev_open ( snpdev->netdev ) ) != 0 ) {
DBGC ( snpdev, "SNPDEV %p could not open %s: %s\n",
snpdev, snpdev->netdev->name, strerror ( rc ) );
return RC_TO_EFIRC ( rc );
}
snpdev->mode.State = EfiSimpleNetworkInitialized;
return 0;
}
/**
* Reset the network device
*
* @v snp SNP interface
* @v ext_verify Extended verification required
* @ret efirc EFI status code
*/
static EFI_STATUS EFIAPI
efi_snp_reset ( EFI_SIMPLE_NETWORK_PROTOCOL *snp, BOOLEAN ext_verify ) {
struct efi_snp_device *snpdev =
container_of ( snp, struct efi_snp_device, snp );
int rc;
DBGC2 ( snpdev, "SNPDEV %p RESET (%s extended verification)\n",
snpdev, ( ext_verify ? "with" : "without" ) );
netdev_close ( snpdev->netdev );
snpdev->mode.State = EfiSimpleNetworkStarted;
if ( ( rc = netdev_open ( snpdev->netdev ) ) != 0 ) {
DBGC ( snpdev, "SNPDEV %p could not reopen %s: %s\n",
snpdev, snpdev->netdev->name, strerror ( rc ) );
return RC_TO_EFIRC ( rc );
}
snpdev->mode.State = EfiSimpleNetworkInitialized;
return 0;
}
/**
* Shut down the network device
*
* @v snp SNP interface
* @ret efirc EFI status code
*/
static EFI_STATUS EFIAPI
efi_snp_shutdown ( EFI_SIMPLE_NETWORK_PROTOCOL *snp ) {
struct efi_snp_device *snpdev =
container_of ( snp, struct efi_snp_device, snp );
DBGC2 ( snpdev, "SNPDEV %p SHUTDOWN\n", snpdev );
netdev_close ( snpdev->netdev );
snpdev->mode.State = EfiSimpleNetworkStarted;
return 0;
}
/**
* Manage receive filters
*
* @v snp SNP interface
* @v enable Receive filters to enable
* @v disable Receive filters to disable
* @v mcast_reset Reset multicast filters
* @v mcast_count Number of multicast filters
* @v mcast Multicast filters
* @ret efirc EFI status code
*/
static EFI_STATUS EFIAPI
efi_snp_receive_filters ( EFI_SIMPLE_NETWORK_PROTOCOL *snp, UINT32 enable,
UINT32 disable, BOOLEAN mcast_reset,
UINTN mcast_count, EFI_MAC_ADDRESS *mcast ) {
struct efi_snp_device *snpdev =
container_of ( snp, struct efi_snp_device, snp );
unsigned int i;
DBGC2 ( snpdev, "SNPDEV %p RECEIVE_FILTERS %08x&~%08x%s %ld mcast\n",
snpdev, enable, disable, ( mcast_reset ? " reset" : "" ),
( ( unsigned long ) mcast_count ) );
for ( i = 0 ; i < mcast_count ; i++ ) {
DBGC2_HDA ( snpdev, i, &mcast[i],
snpdev->netdev->ll_protocol->ll_addr_len );
}
/* Lie through our teeth, otherwise MNP refuses to accept us */
return 0;
}
/**
* Set station address
*
* @v snp SNP interface
* @v reset Reset to permanent address
* @v new New station address
* @ret efirc EFI status code
*/
static EFI_STATUS EFIAPI
efi_snp_station_address ( EFI_SIMPLE_NETWORK_PROTOCOL *snp, BOOLEAN reset,
EFI_MAC_ADDRESS *new ) {
struct efi_snp_device *snpdev =
container_of ( snp, struct efi_snp_device, snp );
struct ll_protocol *ll_protocol = snpdev->netdev->ll_protocol;
DBGC2 ( snpdev, "SNPDEV %p STATION_ADDRESS %s\n", snpdev,
( reset ? "reset" : ll_protocol->ntoa ( new ) ) );
/* Set the MAC address */
if ( reset )
new = &snpdev->mode.PermanentAddress;
memcpy ( snpdev->netdev->ll_addr, new, ll_protocol->ll_addr_len );
/* MAC address changes take effect only on netdev_open() */
if ( netdev_is_open ( snpdev->netdev ) ) {
DBGC ( snpdev, "SNPDEV %p MAC address changed while net "
"devive open\n", snpdev );
}
return 0;
}
/**
* Get (or reset) statistics
*
* @v snp SNP interface
* @v reset Reset statistics
* @v stats_len Size of statistics table
* @v stats Statistics table
* @ret efirc EFI status code
*/
static EFI_STATUS EFIAPI
efi_snp_statistics ( EFI_SIMPLE_NETWORK_PROTOCOL *snp, BOOLEAN reset,
UINTN *stats_len, EFI_NETWORK_STATISTICS *stats ) {
struct efi_snp_device *snpdev =
container_of ( snp, struct efi_snp_device, snp );
EFI_NETWORK_STATISTICS stats_buf;
DBGC2 ( snpdev, "SNPDEV %p STATISTICS%s", snpdev,
( reset ? " reset" : "" ) );
/* Gather statistics */
memset ( &stats_buf, 0, sizeof ( stats_buf ) );
stats_buf.TxGoodFrames = snpdev->netdev->tx_stats.good;
stats_buf.TxDroppedFrames = snpdev->netdev->tx_stats.bad;
stats_buf.TxTotalFrames = ( snpdev->netdev->tx_stats.good +
snpdev->netdev->tx_stats.bad );
stats_buf.RxGoodFrames = snpdev->netdev->rx_stats.good;
stats_buf.RxDroppedFrames = snpdev->netdev->rx_stats.bad;
stats_buf.RxTotalFrames = ( snpdev->netdev->rx_stats.good +
snpdev->netdev->rx_stats.bad );
if ( *stats_len > sizeof ( stats_buf ) )
*stats_len = sizeof ( stats_buf );
if ( stats )
memcpy ( stats, &stats_buf, *stats_len );
/* Reset statistics if requested to do so */
if ( reset ) {
memset ( &snpdev->netdev->tx_stats, 0,
sizeof ( snpdev->netdev->tx_stats ) );
memset ( &snpdev->netdev->rx_stats, 0,
sizeof ( snpdev->netdev->rx_stats ) );
}
return 0;
}
/**
* Convert multicast IP address to MAC address
*
* @v snp SNP interface
* @v ipv6 Address is IPv6
* @v ip IP address
* @v mac MAC address
* @ret efirc EFI status code
*/
static EFI_STATUS EFIAPI
efi_snp_mcast_ip_to_mac ( EFI_SIMPLE_NETWORK_PROTOCOL *snp, BOOLEAN ipv6,
EFI_IP_ADDRESS *ip, EFI_MAC_ADDRESS *mac ) {
struct efi_snp_device *snpdev =
container_of ( snp, struct efi_snp_device, snp );
struct ll_protocol *ll_protocol = snpdev->netdev->ll_protocol;
const char *ip_str;
int rc;
ip_str = ( ipv6 ? "(IPv6)" /* FIXME when we have inet6_ntoa() */ :
inet_ntoa ( *( ( struct in_addr * ) ip ) ) );
DBGC2 ( snpdev, "SNPDEV %p MCAST_IP_TO_MAC %s\n", snpdev, ip_str );
/* Try to hash the address */
if ( ( rc = ll_protocol->mc_hash ( ( ipv6 ? AF_INET6 : AF_INET ),
ip, mac ) ) != 0 ) {
DBGC ( snpdev, "SNPDEV %p could not hash %s: %s\n",
snpdev, ip_str, strerror ( rc ) );
return RC_TO_EFIRC ( rc );
}
return 0;
}
/**
* Read or write non-volatile storage
*
* @v snp SNP interface
* @v read Operation is a read
* @v offset Starting offset within NVRAM
* @v len Length of data buffer
* @v data Data buffer
* @ret efirc EFI status code
*/
static EFI_STATUS EFIAPI
efi_snp_nvdata ( EFI_SIMPLE_NETWORK_PROTOCOL *snp, BOOLEAN read,
UINTN offset, UINTN len, VOID *data ) {
struct efi_snp_device *snpdev =
container_of ( snp, struct efi_snp_device, snp );
DBGC2 ( snpdev, "SNPDEV %p NVDATA %s %lx+%lx\n", snpdev,
( read ? "read" : "write" ), ( ( unsigned long ) offset ),
( ( unsigned long ) len ) );
if ( ! read )
DBGC2_HDA ( snpdev, offset, data, len );
return EFI_UNSUPPORTED;
}
/**
* Read interrupt status and TX recycled buffer status
*
* @v snp SNP interface
* @v interrupts Interrupt status, or NULL
* @v txbufs Recycled transmit buffer address, or NULL
* @ret efirc EFI status code
*/
static EFI_STATUS EFIAPI
efi_snp_get_status ( EFI_SIMPLE_NETWORK_PROTOCOL *snp,
UINT32 *interrupts, VOID **txbufs ) {
struct efi_snp_device *snpdev =
container_of ( snp, struct efi_snp_device, snp );
DBGC2 ( snpdev, "SNPDEV %p GET_STATUS", snpdev );
/* Poll the network device */
efi_snp_poll ( snpdev );
/* Interrupt status. In practice, this seems to be used only
* to detect TX completions.
*/
if ( interrupts ) {
*interrupts = 0;
/* Report TX completions once queue is empty; this
* avoids having to add hooks in the net device layer.
*/
if ( snpdev->tx_count_interrupts &&
list_empty ( &snpdev->netdev->tx_queue ) ) {
*interrupts |= EFI_SIMPLE_NETWORK_TRANSMIT_INTERRUPT;
snpdev->tx_count_interrupts--;
}
/* Report RX */
if ( snpdev->rx_count_interrupts ) {
*interrupts |= EFI_SIMPLE_NETWORK_RECEIVE_INTERRUPT;
snpdev->rx_count_interrupts--;
}
DBGC2 ( snpdev, " INTS:%02x", *interrupts );
}
/* TX completions. It would be possible to design a more
* idiotic scheme for this, but it would be a challenge.
* According to the UEFI header file, txbufs will be filled in
* with a list of "recycled transmit buffers" (i.e. completed
* TX buffers). Observant readers may care to note that
* *txbufs is a void pointer. Precisely how a list of
* completed transmit buffers is meant to be represented as an
* array of voids is left as an exercise for the reader.
*
* The only users of this interface (MnpDxe/MnpIo.c and
* PxeBcDxe/Bc.c within the EFI dev kit) both just poll until
* seeing a non-NULL result return in txbufs. This is valid
* provided that they do not ever attempt to transmit more
* than one packet concurrently (and that TX never times out).
*/
if ( txbufs ) {
if ( snpdev->tx_count_txbufs &&
list_empty ( &snpdev->netdev->tx_queue ) ) {
*txbufs = "Which idiot designed this API?";
snpdev->tx_count_txbufs--;
} else {
*txbufs = NULL;
}
DBGC2 ( snpdev, " TX:%s", ( *txbufs ? "some" : "none" ) );
}
DBGC2 ( snpdev, "\n" );
return 0;
}
/**
* Start packet transmission
*
* @v snp SNP interface
* @v ll_header_len Link-layer header length, if to be filled in
* @v len Length of data buffer
* @v data Data buffer
* @v ll_src Link-layer source address, if specified
* @v ll_dest Link-layer destination address, if specified
* @v net_proto Network-layer protocol (in host order)
* @ret efirc EFI status code
*/
static EFI_STATUS EFIAPI
efi_snp_transmit ( EFI_SIMPLE_NETWORK_PROTOCOL *snp,
UINTN ll_header_len, UINTN len, VOID *data,
EFI_MAC_ADDRESS *ll_src, EFI_MAC_ADDRESS *ll_dest,
UINT16 *net_proto ) {
struct efi_snp_device *snpdev =
container_of ( snp, struct efi_snp_device, snp );
struct ll_protocol *ll_protocol = snpdev->netdev->ll_protocol;
struct io_buffer *iobuf;
size_t ll_headroom;
int rc;
EFI_STATUS efirc;
DBGC2 ( snpdev, "SNPDEV %p TRANSMIT %p+%lx", snpdev, data,
( ( unsigned long ) len ) );
if ( ll_header_len ) {
if ( ll_src ) {
DBGC2 ( snpdev, " src %s",
ll_protocol->ntoa ( ll_src ) );
}
if ( ll_dest ) {
DBGC2 ( snpdev, " dest %s",
ll_protocol->ntoa ( ll_dest ) );
}
if ( net_proto ) {
DBGC2 ( snpdev, " proto %04x", *net_proto );
}
}
DBGC2 ( snpdev, "\n" );
/* Sanity checks */
if ( ll_header_len ) {
if ( ll_header_len != ll_protocol->ll_header_len ) {
DBGC ( snpdev, "SNPDEV %p TX invalid header length "
"%ld\n", snpdev,
( ( unsigned long ) ll_header_len ) );
efirc = EFI_INVALID_PARAMETER;
goto err_sanity;
}
if ( len < ll_header_len ) {
DBGC ( snpdev, "SNPDEV %p invalid packet length %ld\n",
snpdev, ( ( unsigned long ) len ) );
efirc = EFI_BUFFER_TOO_SMALL;
goto err_sanity;
}
if ( ! ll_dest ) {
DBGC ( snpdev, "SNPDEV %p TX missing destination "
"address\n", snpdev );
efirc = EFI_INVALID_PARAMETER;
goto err_sanity;
}
if ( ! net_proto ) {
DBGC ( snpdev, "SNPDEV %p TX missing network "
"protocol\n", snpdev );
efirc = EFI_INVALID_PARAMETER;
goto err_sanity;
}
if ( ! ll_src )
ll_src = &snpdev->mode.CurrentAddress;
}
/* Allocate buffer */
ll_headroom = ( MAX_LL_HEADER_LEN - ll_header_len );
iobuf = alloc_iob ( ll_headroom + len );
if ( ! iobuf ) {
DBGC ( snpdev, "SNPDEV %p TX could not allocate %ld-byte "
"buffer\n", snpdev, ( ( unsigned long ) len ) );
efirc = EFI_DEVICE_ERROR;
goto err_alloc_iob;
}
iob_reserve ( iobuf, ll_headroom );
memcpy ( iob_put ( iobuf, len ), data, len );
/* Create link-layer header, if specified */
if ( ll_header_len ) {
iob_pull ( iobuf, ll_header_len );
if ( ( rc = ll_protocol->push ( snpdev->netdev,
iobuf, ll_dest, ll_src,
htons ( *net_proto ) )) != 0 ){
DBGC ( snpdev, "SNPDEV %p TX could not construct "
"header: %s\n", snpdev, strerror ( rc ) );
efirc = RC_TO_EFIRC ( rc );
goto err_ll_push;
}
}
/* Transmit packet */
if ( ( rc = netdev_tx ( snpdev->netdev, iob_disown ( iobuf ) ) ) != 0){
DBGC ( snpdev, "SNPDEV %p TX could not transmit: %s\n",
snpdev, strerror ( rc ) );
efirc = RC_TO_EFIRC ( rc );
goto err_tx;
}
/* Record transmission as outstanding */
snpdev->tx_count_interrupts++;
snpdev->tx_count_txbufs++;
return 0;
err_tx:
err_ll_push:
free_iob ( iobuf );
err_alloc_iob:
err_sanity:
return efirc;
}
/**
* Receive packet
*
* @v snp SNP interface
* @v ll_header_len Link-layer header length, if to be filled in
* @v len Length of data buffer
* @v data Data buffer
* @v ll_src Link-layer source address, if specified
* @v ll_dest Link-layer destination address, if specified
* @v net_proto Network-layer protocol (in host order)
* @ret efirc EFI status code
*/
static EFI_STATUS EFIAPI
efi_snp_receive ( EFI_SIMPLE_NETWORK_PROTOCOL *snp,
UINTN *ll_header_len, UINTN *len, VOID *data,
EFI_MAC_ADDRESS *ll_src, EFI_MAC_ADDRESS *ll_dest,
UINT16 *net_proto ) {
struct efi_snp_device *snpdev =
container_of ( snp, struct efi_snp_device, snp );
struct ll_protocol *ll_protocol = snpdev->netdev->ll_protocol;
struct io_buffer *iobuf;
const void *iob_ll_dest;
const void *iob_ll_src;
uint16_t iob_net_proto;
int rc;
EFI_STATUS efirc;
DBGC2 ( snpdev, "SNPDEV %p RECEIVE %p(+%lx)", snpdev, data,
( ( unsigned long ) *len ) );
/* Poll the network device */
efi_snp_poll ( snpdev );
/* Dequeue a packet, if one is available */
iobuf = netdev_rx_dequeue ( snpdev->netdev );
if ( ! iobuf ) {
DBGC2 ( snpdev, "\n" );
efirc = EFI_NOT_READY;
goto out_no_packet;
}
DBGC2 ( snpdev, "+%zx\n", iob_len ( iobuf ) );
/* Return packet to caller */
memcpy ( data, iobuf->data, iob_len ( iobuf ) );
*len = iob_len ( iobuf );
/* Attempt to decode link-layer header */
if ( ( rc = ll_protocol->pull ( snpdev->netdev, iobuf, &iob_ll_dest,
&iob_ll_src, &iob_net_proto ) ) != 0 ){
DBGC ( snpdev, "SNPDEV %p could not parse header: %s\n",
snpdev, strerror ( rc ) );
efirc = RC_TO_EFIRC ( rc );
goto out_bad_ll_header;
}
/* Return link-layer header parameters to caller, if required */
if ( ll_header_len )
*ll_header_len = ll_protocol->ll_header_len;
if ( ll_src )
memcpy ( ll_src, iob_ll_src, ll_protocol->ll_addr_len );
if ( ll_dest )
memcpy ( ll_dest, iob_ll_dest, ll_protocol->ll_addr_len );
if ( net_proto )
*net_proto = ntohs ( iob_net_proto );
efirc = 0;
out_bad_ll_header:
free_iob ( iobuf );
out_no_packet:
return efirc;
}
/**
* Poll event
*
* @v event Event
* @v context Event context
*/
static VOID EFIAPI efi_snp_wait_for_packet ( EFI_EVENT event,
VOID *context ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
struct efi_snp_device *snpdev = context;
DBGCP ( snpdev, "SNPDEV %p WAIT_FOR_PACKET\n", snpdev );
/* Do nothing unless the net device is open */
if ( ! netdev_is_open ( snpdev->netdev ) )
return;
/* Poll the network device */
efi_snp_poll ( snpdev );
/* Fire event if packets have been received */
if ( snpdev->rx_count_events != 0 ) {
DBGC2 ( snpdev, "SNPDEV %p firing WaitForPacket event\n",
snpdev );
bs->SignalEvent ( event );
snpdev->rx_count_events--;
}
}
/** SNP interface */
static EFI_SIMPLE_NETWORK_PROTOCOL efi_snp_device_snp = {
.Revision = EFI_SIMPLE_NETWORK_PROTOCOL_REVISION,
.Start = efi_snp_start,
.Stop = efi_snp_stop,
.Initialize = efi_snp_initialize,
.Reset = efi_snp_reset,
.Shutdown = efi_snp_shutdown,
.ReceiveFilters = efi_snp_receive_filters,
.StationAddress = efi_snp_station_address,
.Statistics = efi_snp_statistics,
.MCastIpToMac = efi_snp_mcast_ip_to_mac,
.NvData = efi_snp_nvdata,
.GetStatus = efi_snp_get_status,
.Transmit = efi_snp_transmit,
.Receive = efi_snp_receive,
};
/**
* Locate SNP device corresponding to network device
*
* @v netdev Network device
* @ret snp SNP device, or NULL if not found
*/
static struct efi_snp_device * efi_snp_demux ( struct net_device *netdev ) {
struct efi_snp_device *snpdev;
list_for_each_entry ( snpdev, &efi_snp_devices, list ) {
if ( snpdev->netdev == netdev )
return snpdev;
}
return NULL;
}
/**
* Create SNP device
*
* @v netdev Network device
* @ret rc Return status code
*/
static int efi_snp_probe ( struct net_device *netdev ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
struct efi_pci_device *efipci;
struct efi_snp_device *snpdev;
EFI_DEVICE_PATH_PROTOCOL *path_end;
MAC_ADDR_DEVICE_PATH *macpath;
size_t path_prefix_len = 0;
EFI_STATUS efirc;
int rc;
/* Find EFI PCI device */
efipci = efipci_find ( netdev->dev );
if ( ! efipci ) {
DBG ( "SNP skipping non-PCI device %s\n", netdev->name );
rc = 0;
goto err_no_pci;
}
/* Calculate device path prefix length */
path_end = efi_devpath_end ( efipci->path );
path_prefix_len = ( ( ( void * ) path_end ) -
( ( void * ) efipci->path ) );
/* Allocate the SNP device */
snpdev = zalloc ( sizeof ( *snpdev ) + path_prefix_len +
sizeof ( *macpath ) );
if ( ! snpdev ) {
rc = -ENOMEM;
goto err_alloc_snp;
}
snpdev->netdev = netdev_get ( netdev );
snpdev->efipci = efipci;
/* Sanity check */
if ( netdev->ll_protocol->ll_addr_len > sizeof ( EFI_MAC_ADDRESS ) ) {
DBGC ( snpdev, "SNPDEV %p cannot support link-layer address "
"length %d for %s\n", snpdev,
netdev->ll_protocol->ll_addr_len, netdev->name );
rc = -ENOTSUP;
goto err_ll_addr_len;
}
/* Populate the SNP structure */
memcpy ( &snpdev->snp, &efi_snp_device_snp, sizeof ( snpdev->snp ) );
snpdev->snp.Mode = &snpdev->mode;
if ( ( efirc = bs->CreateEvent ( EVT_NOTIFY_WAIT, TPL_NOTIFY,
efi_snp_wait_for_packet, snpdev,
&snpdev->snp.WaitForPacket ) ) != 0 ){
DBGC ( snpdev, "SNPDEV %p could not create event: %s\n",
snpdev, efi_strerror ( efirc ) );
rc = EFIRC_TO_RC ( efirc );
goto err_create_event;
}
/* Populate the SNP mode structure */
snpdev->mode.State = EfiSimpleNetworkStopped;
efi_snp_set_mode ( snpdev );
/* Populate the NII structure */
snpdev->nii.Revision =
EFI_NETWORK_INTERFACE_IDENTIFIER_PROTOCOL_REVISION;
strncpy ( snpdev->nii.StringId, "iPXE",
sizeof ( snpdev->nii.StringId ) );
/* Populate the device name */
efi_snprintf ( snpdev->name, ( sizeof ( snpdev->name ) /
sizeof ( snpdev->name[0] ) ),
"%s", netdev->name );
/* Populate the device path */
memcpy ( &snpdev->path, efipci->path, path_prefix_len );
macpath = ( ( ( void * ) &snpdev->path ) + path_prefix_len );
path_end = ( ( void * ) ( macpath + 1 ) );
memset ( macpath, 0, sizeof ( *macpath ) );
macpath->Header.Type = MESSAGING_DEVICE_PATH;
macpath->Header.SubType = MSG_MAC_ADDR_DP;
macpath->Header.Length[0] = sizeof ( *macpath );
memcpy ( &macpath->MacAddress, netdev->ll_addr,
sizeof ( macpath->MacAddress ) );
macpath->IfType = ntohs ( netdev->ll_protocol->ll_proto );
memset ( path_end, 0, sizeof ( *path_end ) );
path_end->Type = END_DEVICE_PATH_TYPE;
path_end->SubType = END_ENTIRE_DEVICE_PATH_SUBTYPE;
path_end->Length[0] = sizeof ( *path_end );
/* Install the SNP */
if ( ( efirc = bs->InstallMultipleProtocolInterfaces (
&snpdev->handle,
&efi_simple_network_protocol_guid, &snpdev->snp,
&efi_device_path_protocol_guid, &snpdev->path,
&efi_nii_protocol_guid, &snpdev->nii,
&efi_nii31_protocol_guid, &snpdev->nii,
NULL ) ) != 0 ) {
DBGC ( snpdev, "SNPDEV %p could not install protocols: "
"%s\n", snpdev, efi_strerror ( efirc ) );
rc = EFIRC_TO_RC ( efirc );
goto err_install_protocol_interface;
}
/* Add as child of PCI device */
if ( ( efirc = efipci_child_add ( efipci, snpdev->handle ) ) != 0 ) {
DBGC ( snpdev, "SNPDEV %p could not become child of " PCI_FMT
": %s\n", snpdev, PCI_ARGS ( &efipci->pci ),
efi_strerror ( efirc ) );
rc = EFIRC_TO_RC ( efirc );
goto err_efipci_child_add;
}
/* Add to list of SNP devices */
list_add ( &snpdev->list, &efi_snp_devices );
DBGC ( snpdev, "SNPDEV %p installed for %s as device %p\n",
snpdev, netdev->name, snpdev->handle );
return 0;
efipci_child_del ( efipci, snpdev->handle );
err_efipci_child_add:
bs->UninstallMultipleProtocolInterfaces (
snpdev->handle,
&efi_simple_network_protocol_guid, &snpdev->snp,
&efi_device_path_protocol_guid, &snpdev->path,
&efi_nii_protocol_guid, &snpdev->nii,
&efi_nii31_protocol_guid, &snpdev->nii,
NULL );
err_install_protocol_interface:
bs->CloseEvent ( snpdev->snp.WaitForPacket );
err_create_event:
err_ll_addr_len:
netdev_put ( netdev );
free ( snpdev );
err_alloc_snp:
err_no_pci:
return rc;
}
/**
* Handle SNP device or link state change
*
* @v netdev Network device
*/
static void efi_snp_notify ( struct net_device *netdev __unused ) {
/* Nothing to do */
}
/**
* Destroy SNP device
*
* @v netdev Network device
*/
static void efi_snp_remove ( struct net_device *netdev ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
struct efi_snp_device *snpdev;
/* Locate SNP device */
snpdev = efi_snp_demux ( netdev );
if ( ! snpdev ) {
DBG ( "SNP skipping non-SNP device %s\n", netdev->name );
return;
}
/* Uninstall the SNP */
efipci_child_del ( snpdev->efipci, snpdev->handle );
list_del ( &snpdev->list );
bs->UninstallMultipleProtocolInterfaces (
snpdev->handle,
&efi_simple_network_protocol_guid, &snpdev->snp,
&efi_device_path_protocol_guid, &snpdev->path,
&efi_nii_protocol_guid, &snpdev->nii,
&efi_nii31_protocol_guid, &snpdev->nii,
NULL );
bs->CloseEvent ( snpdev->snp.WaitForPacket );
netdev_put ( snpdev->netdev );
free ( snpdev );
}
/** SNP driver */
struct net_driver efi_snp_driver __net_driver = {
.name = "SNP",
.probe = efi_snp_probe,
.notify = efi_snp_notify,
.remove = efi_snp_remove,
};
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