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opengnsys_ipxe/src/arch/i386/drivers/net/undinet.c

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/*
* Copyright (C) 2007 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 <string.h>
#include <unistd.h>
#include <byteswap.h>
#include <pxe.h>
#include <realmode.h>
#include <pic8259.h>
#include <biosint.h>
#include <pnpbios.h>
#include <basemem_packet.h>
#include <ipxe/io.h>
#include <ipxe/iobuf.h>
#include <ipxe/netdevice.h>
#include <ipxe/if_ether.h>
#include <ipxe/ethernet.h>
#include <ipxe/profile.h>
#include <undi.h>
#include <undinet.h>
#include <pxeparent.h>
/** @file
*
* UNDI network device driver
*
*/
/** An UNDI NIC */
struct undi_nic {
/** Device supports IRQs */
int irq_supported;
/** Assigned IRQ number */
unsigned int irq;
/** Currently processing ISR */
int isr_processing;
/** Bug workarounds */
int hacks;
};
/**
* @defgroup undi_hacks UNDI workarounds
* @{
*/
/** Work around Etherboot 5.4 bugs */
#define UNDI_HACK_EB54 0x0001
/** @} */
/** Maximum number of times to retry PXENV_UNDI_INITIALIZE */
#define UNDI_INITIALIZE_RETRY_MAX 10
/** Delay between retries of PXENV_UNDI_INITIALIZE */
#define UNDI_INITIALIZE_RETRY_DELAY_MS 200
/** Maximum number of received packets per poll */
#define UNDI_RX_QUOTA 4
/** Alignment of received frame payload */
#define UNDI_RX_ALIGN 16
static void undinet_close ( struct net_device *netdev );
/** Address of UNDI entry point */
static SEGOFF16_t undinet_entry;
/** Transmit profiler */
static struct profiler undinet_tx_profiler __profiler =
{ .name = "undinet.tx" };
/** Transmit call profiler */
static struct profiler undinet_tx_call_profiler __profiler =
{ .name = "undinet.tx_call" };
/** IRQ profiler */
static struct profiler undinet_irq_profiler __profiler =
{ .name = "undinet.irq" };
/** ISR call profiler */
static struct profiler undinet_isr_call_profiler __profiler =
{ .name = "undinet.isr_call" };
/** Receive profiler */
static struct profiler undinet_rx_profiler __profiler =
{ .name = "undinet.rx" };
/*****************************************************************************
*
* UNDI interrupt service routine
*
*****************************************************************************
*/
/**
* UNDI interrupt service routine
*
* The UNDI ISR increments a counter (@c trigger_count) and exits.
*/
extern void undiisr ( void );
/** IRQ number */
uint8_t __data16 ( undiisr_irq );
#define undiisr_irq __use_data16 ( undiisr_irq )
/** IRQ chain vector */
struct segoff __data16 ( undiisr_next_handler );
#define undiisr_next_handler __use_data16 ( undiisr_next_handler )
/** IRQ trigger count */
volatile uint8_t __data16 ( undiisr_trigger_count ) = 0;
#define undiisr_trigger_count __use_data16 ( undiisr_trigger_count )
/** Last observed trigger count */
static unsigned int last_trigger_count = 0;
/**
* Hook UNDI interrupt service routine
*
* @v irq IRQ number
*/
static void undinet_hook_isr ( unsigned int irq ) {
assert ( irq <= IRQ_MAX );
assert ( undiisr_irq == 0 );
undiisr_irq = irq;
hook_bios_interrupt ( IRQ_INT ( irq ), ( ( intptr_t ) undiisr ),
&undiisr_next_handler );
}
/**
* Unhook UNDI interrupt service routine
*
* @v irq IRQ number
*/
static void undinet_unhook_isr ( unsigned int irq ) {
assert ( irq <= IRQ_MAX );
unhook_bios_interrupt ( IRQ_INT ( irq ), ( ( intptr_t ) undiisr ),
&undiisr_next_handler );
undiisr_irq = 0;
}
/**
* Test to see if UNDI ISR has been triggered
*
* @ret triggered ISR has been triggered since last check
*/
static int undinet_isr_triggered ( void ) {
unsigned int this_trigger_count;
/* Read trigger_count. Do this only once; it is volatile */
this_trigger_count = undiisr_trigger_count;
if ( this_trigger_count == last_trigger_count ) {
/* Not triggered */
return 0;
} else {
/* Triggered */
last_trigger_count = this_trigger_count;
return 1;
}
}
/*****************************************************************************
*
* UNDI network device interface
*
*****************************************************************************
*/
/** UNDI transmit buffer descriptor */
static struct s_PXENV_UNDI_TBD __data16 ( undinet_tbd );
#define undinet_tbd __use_data16 ( undinet_tbd )
/** UNDI transmit destination address */
static uint8_t __data16_array ( undinet_destaddr, [ETH_ALEN] );
#define undinet_destaddr __use_data16 ( undinet_destaddr )
/**
* Transmit packet
*
* @v netdev Network device
* @v iobuf I/O buffer
* @ret rc Return status code
*/
static int undinet_transmit ( struct net_device *netdev,
struct io_buffer *iobuf ) {
struct undi_nic *undinic = netdev->priv;
struct s_PXENV_UNDI_TRANSMIT undi_transmit;
const void *ll_dest;
const void *ll_source;
uint16_t net_proto;
unsigned int flags;
uint8_t protocol;
size_t len;
int rc;
/* Start profiling */
profile_start ( &undinet_tx_profiler );
/* Technically, we ought to make sure that the previous
* transmission has completed before we re-use the buffer.
* However, many PXE stacks (including at least some Intel PXE
* stacks and Etherboot 5.4) fail to generate TX completions.
* In practice this won't be a problem, since our TX datapath
* has a very low packet volume and we can get away with
* assuming that a TX will be complete by the time we want to
* transmit the next packet.
*/
/* Some PXE stacks are unable to cope with P_UNKNOWN, and will
* always try to prepend a link-layer header. Work around
* these stacks by stripping the existing link-layer header
* and allowing the PXE stack to (re)construct the link-layer
* header itself.
*/
if ( ( rc = eth_pull ( netdev, iobuf, &ll_dest, &ll_source,
&net_proto, &flags ) ) != 0 ) {
DBGC ( undinic, "UNDINIC %p could not strip Ethernet header: "
"%s\n", undinic, strerror ( rc ) );
return rc;
}
memcpy ( undinet_destaddr, ll_dest, sizeof ( undinet_destaddr ) );
switch ( net_proto ) {
case htons ( ETH_P_IP ) :
protocol = P_IP;
break;
case htons ( ETH_P_ARP ) :
protocol = P_ARP;
break;
case htons ( ETH_P_RARP ) :
protocol = P_RARP;
break;
default:
/* Unknown protocol; restore the original link-layer header */
iob_push ( iobuf, sizeof ( struct ethhdr ) );
protocol = P_UNKNOWN;
break;
}
/* Copy packet to UNDI I/O buffer */
len = iob_len ( iobuf );
if ( len > sizeof ( basemem_packet ) )
len = sizeof ( basemem_packet );
memcpy ( &basemem_packet, iobuf->data, len );
/* Create PXENV_UNDI_TRANSMIT data structure */
memset ( &undi_transmit, 0, sizeof ( undi_transmit ) );
undi_transmit.Protocol = protocol;
undi_transmit.XmitFlag = ( ( flags & LL_BROADCAST ) ?
XMT_BROADCAST : XMT_DESTADDR );
undi_transmit.DestAddr.segment = rm_ds;
undi_transmit.DestAddr.offset = __from_data16 ( &undinet_destaddr );
undi_transmit.TBD.segment = rm_ds;
undi_transmit.TBD.offset = __from_data16 ( &undinet_tbd );
/* Create PXENV_UNDI_TBD data structure */
undinet_tbd.ImmedLength = len;
undinet_tbd.Xmit.segment = rm_ds;
undinet_tbd.Xmit.offset = __from_data16 ( basemem_packet );
/* Issue PXE API call */
profile_start ( &undinet_tx_call_profiler );
if ( ( rc = pxeparent_call ( undinet_entry, PXENV_UNDI_TRANSMIT,
&undi_transmit,
sizeof ( undi_transmit ) ) ) != 0 )
goto done;
profile_stop ( &undinet_tx_call_profiler );
/* Free I/O buffer */
netdev_tx_complete ( netdev, iobuf );
profile_stop ( &undinet_tx_profiler );
done:
return rc;
}
/**
* Poll for received packets
*
* @v netdev Network device
*
* Fun, fun, fun. UNDI drivers don't use polling; they use
* interrupts. We therefore cheat and pretend that an interrupt has
* occurred every time undinet_poll() is called. This isn't too much
* of a hack; PCI devices share IRQs and so the first thing that a
* proper ISR should do is call PXENV_UNDI_ISR to determine whether or
* not the UNDI NIC generated the interrupt; there is no harm done by
* spurious calls to PXENV_UNDI_ISR. Similarly, we wouldn't be
* handling them any more rapidly than the usual rate of
* undinet_poll() being called even if we did implement a full ISR.
* So it should work. Ha!
*
* Addendum (21/10/03). Some cards don't play nicely with this trick,
* so instead of doing it the easy way we have to go to all the hassle
* of installing a genuine interrupt service routine and dealing with
* the wonderful 8259 Programmable Interrupt Controller. Joy.
*
* Addendum (10/07/07). When doing things such as iSCSI boot, in
* which we have to co-operate with a running OS, we can't get away
* with the "ISR-just-increments-a-counter-and-returns" trick at all,
* because it involves tying up the PIC for far too long, and other
* interrupt-dependent components (e.g. local disks) start breaking.
* We therefore implement a "proper" ISR which calls PXENV_UNDI_ISR
* from within interrupt context in order to deassert the device
* interrupt, and sends EOI if applicable.
*/
static void undinet_poll ( struct net_device *netdev ) {
struct undi_nic *undinic = netdev->priv;
struct s_PXENV_UNDI_ISR undi_isr;
struct io_buffer *iobuf = NULL;
unsigned int quota = UNDI_RX_QUOTA;
size_t len;
size_t reserve_len;
size_t frag_len;
size_t max_frag_len;
int rc;
if ( ! undinic->isr_processing ) {
/* Allow interrupt to occur. Do this even if
* interrupts are not known to be supported, since
* some cards erroneously report that they do not
* support interrupts.
*/
if ( ! undinet_isr_triggered() ) {
/* Allow interrupt to occur */
profile_start ( &undinet_irq_profiler );
__asm__ __volatile__ ( "sti\n\t"
"nop\n\t"
"nop\n\t"
"cli\n\t" );
profile_stop ( &undinet_irq_profiler );
/* If interrupts are known to be supported,
* then do nothing on this poll; wait for the
* interrupt to be triggered.
*/
if ( undinic->irq_supported )
return;
}
/* Start ISR processing */
undinic->isr_processing = 1;
undi_isr.FuncFlag = PXENV_UNDI_ISR_IN_PROCESS;
} else {
/* Continue ISR processing */
undi_isr.FuncFlag = PXENV_UNDI_ISR_IN_GET_NEXT;
}
/* Run through the ISR loop */
while ( quota ) {
profile_start ( &undinet_isr_call_profiler );
if ( ( rc = pxeparent_call ( undinet_entry, PXENV_UNDI_ISR,
&undi_isr,
sizeof ( undi_isr ) ) ) != 0 ) {
netdev_rx_err ( netdev, NULL, rc );
break;
}
profile_stop ( &undinet_isr_call_profiler );
switch ( undi_isr.FuncFlag ) {
case PXENV_UNDI_ISR_OUT_TRANSMIT:
/* We don't care about transmit completions */
break;
case PXENV_UNDI_ISR_OUT_RECEIVE:
/* Packet fragment received */
profile_start ( &undinet_rx_profiler );
len = undi_isr.FrameLength;
frag_len = undi_isr.BufferLength;
reserve_len = ( -undi_isr.FrameHeaderLength &
( UNDI_RX_ALIGN - 1 ) );
if ( ( len == 0 ) || ( len < frag_len ) ) {
/* Don't laugh. VMWare does it. */
DBGC ( undinic, "UNDINIC %p reported insane "
"fragment (%zd of %zd bytes)\n",
undinic, frag_len, len );
netdev_rx_err ( netdev, NULL, -EINVAL );
break;
}
if ( ! iobuf ) {
iobuf = alloc_iob ( reserve_len + len );
if ( ! iobuf ) {
DBGC ( undinic, "UNDINIC %p could not "
"allocate %zd bytes for RX "
"buffer\n", undinic, len );
/* Fragment will be dropped */
netdev_rx_err ( netdev, NULL, -ENOMEM );
goto done;
}
iob_reserve ( iobuf, reserve_len );
}
max_frag_len = iob_tailroom ( iobuf );
if ( frag_len > max_frag_len ) {
DBGC ( undinic, "UNDINIC %p fragment too big "
"(%zd+%zd does not fit into %zd)\n",
undinic, iob_len ( iobuf ), frag_len,
( iob_len ( iobuf ) + max_frag_len ) );
frag_len = max_frag_len;
}
copy_from_real ( iob_put ( iobuf, frag_len ),
undi_isr.Frame.segment,
undi_isr.Frame.offset, frag_len );
if ( iob_len ( iobuf ) == len ) {
/* Whole packet received; deliver it */
netdev_rx ( netdev, iob_disown ( iobuf ) );
quota--;
/* Etherboot 5.4 fails to return all packets
* under mild load; pretend it retriggered.
*/
if ( undinic->hacks & UNDI_HACK_EB54 )
--last_trigger_count;
}
profile_stop ( &undinet_rx_profiler );
break;
case PXENV_UNDI_ISR_OUT_DONE:
/* Processing complete */
undinic->isr_processing = 0;
goto done;
default:
/* Should never happen. VMWare does it routinely. */
DBGC ( undinic, "UNDINIC %p ISR returned invalid "
"FuncFlag %04x\n", undinic, undi_isr.FuncFlag );
undinic->isr_processing = 0;
goto done;
}
undi_isr.FuncFlag = PXENV_UNDI_ISR_IN_GET_NEXT;
}
done:
if ( iobuf ) {
DBGC ( undinic, "UNDINIC %p returned incomplete packet "
"(%zd of %zd)\n", undinic, iob_len ( iobuf ),
( iob_len ( iobuf ) + iob_tailroom ( iobuf ) ) );
netdev_rx_err ( netdev, iobuf, -EINVAL );
}
}
/**
* Open NIC
*
* @v netdev Net device
* @ret rc Return status code
*/
static int undinet_open ( struct net_device *netdev ) {
struct undi_nic *undinic = netdev->priv;
struct s_PXENV_UNDI_SET_STATION_ADDRESS undi_set_address;
struct s_PXENV_UNDI_OPEN undi_open;
int rc;
/* Hook interrupt service routine and enable interrupt if applicable */
if ( undinic->irq ) {
undinet_hook_isr ( undinic->irq );
enable_irq ( undinic->irq );
send_eoi ( undinic->irq );
}
/* Set station address. Required for some PXE stacks; will
* spuriously fail on others. Ignore failures. We only ever
* use it to set the MAC address to the card's permanent value
* anyway.
*/
memcpy ( undi_set_address.StationAddress, netdev->ll_addr,
sizeof ( undi_set_address.StationAddress ) );
pxeparent_call ( undinet_entry, PXENV_UNDI_SET_STATION_ADDRESS,
&undi_set_address, sizeof ( undi_set_address ) );
/* Open NIC. We ask for promiscuous operation, since it's the
* only way to ask for all multicast addresses. On any
* switched network, it shouldn't really make a difference to
* performance.
*/
memset ( &undi_open, 0, sizeof ( undi_open ) );
undi_open.PktFilter = ( FLTR_DIRECTED | FLTR_BRDCST | FLTR_PRMSCS );
if ( ( rc = pxeparent_call ( undinet_entry, PXENV_UNDI_OPEN,
&undi_open, sizeof ( undi_open ) ) ) != 0 )
goto err;
DBGC ( undinic, "UNDINIC %p opened\n", undinic );
return 0;
err:
undinet_close ( netdev );
return rc;
}
/**
* Close NIC
*
* @v netdev Net device
*/
static void undinet_close ( struct net_device *netdev ) {
struct undi_nic *undinic = netdev->priv;
struct s_PXENV_UNDI_ISR undi_isr;
struct s_PXENV_UNDI_CLOSE undi_close;
int rc;
/* Ensure ISR has exited cleanly */
while ( undinic->isr_processing ) {
undi_isr.FuncFlag = PXENV_UNDI_ISR_IN_GET_NEXT;
if ( ( rc = pxeparent_call ( undinet_entry, PXENV_UNDI_ISR,
&undi_isr,
sizeof ( undi_isr ) ) ) != 0 )
break;
switch ( undi_isr.FuncFlag ) {
case PXENV_UNDI_ISR_OUT_TRANSMIT:
case PXENV_UNDI_ISR_OUT_RECEIVE:
/* Continue draining */
break;
default:
/* Stop processing */
undinic->isr_processing = 0;
break;
}
}
/* Close NIC */
pxeparent_call ( undinet_entry, PXENV_UNDI_CLOSE,
&undi_close, sizeof ( undi_close ) );
/* Disable interrupt and unhook ISR if applicable */
if ( undinic->irq ) {
disable_irq ( undinic->irq );
undinet_unhook_isr ( undinic->irq );
}
DBGC ( undinic, "UNDINIC %p closed\n", undinic );
}
/**
* Enable/disable interrupts
*
* @v netdev Net device
* @v enable Interrupts should be enabled
*/
static void undinet_irq ( struct net_device *netdev, int enable ) {
struct undi_nic *undinic = netdev->priv;
/* Cannot support interrupts yet */
DBGC ( undinic, "UNDINIC %p cannot %s interrupts\n",
undinic, ( enable ? "enable" : "disable" ) );
}
/** UNDI network device operations */
static struct net_device_operations undinet_operations = {
.open = undinet_open,
.close = undinet_close,
.transmit = undinet_transmit,
.poll = undinet_poll,
.irq = undinet_irq,
};
/** A device with broken support for generating interrupts */
struct undinet_irq_broken {
/** PCI vendor ID */
uint16_t pci_vendor;
/** PCI device ID */
uint16_t pci_device;
};
/**
* List of devices with broken support for generating interrupts
*
* Some PXE stacks are known to claim that IRQs are supported, but
* then never generate interrupts. No satisfactory solution has been
* found to this problem; the workaround is to add the PCI vendor and
* device IDs to this list. This is something of a hack, since it
* will generate false positives for identical devices with a working
* PXE stack (e.g. those that have been reflashed with iPXE), but it's
* an improvement on the current situation.
*/
static const struct undinet_irq_broken undinet_irq_broken_list[] = {
/* HP XX70x laptops */
{ .pci_vendor = 0x8086, .pci_device = 0x1502 },
{ .pci_vendor = 0x8086, .pci_device = 0x1503 },
};
/**
* Check for devices with broken support for generating interrupts
*
* @v undi UNDI device
* @ret irq_is_broken Interrupt support is broken; no interrupts are generated
*/
static int undinet_irq_is_broken ( struct undi_device *undi ) {
const struct undinet_irq_broken *broken;
unsigned int i;
for ( i = 0 ; i < ( sizeof ( undinet_irq_broken_list ) /
sizeof ( undinet_irq_broken_list[0] ) ) ; i++ ) {
broken = &undinet_irq_broken_list[i];
if ( ( undi->dev.desc.bus_type == BUS_TYPE_PCI ) &&
( undi->dev.desc.vendor == broken->pci_vendor ) &&
( undi->dev.desc.device == broken->pci_device ) ) {
return 1;
}
}
return 0;
}
/**
* Probe UNDI device
*
* @v undi UNDI device
* @ret rc Return status code
*/
int undinet_probe ( struct undi_device *undi ) {
struct net_device *netdev;
struct undi_nic *undinic;
struct s_PXENV_START_UNDI start_undi;
struct s_PXENV_UNDI_STARTUP undi_startup;
struct s_PXENV_UNDI_INITIALIZE undi_init;
struct s_PXENV_UNDI_GET_INFORMATION undi_info;
struct s_PXENV_UNDI_GET_IFACE_INFO undi_iface;
struct s_PXENV_UNDI_SHUTDOWN undi_shutdown;
struct s_PXENV_UNDI_CLEANUP undi_cleanup;
struct s_PXENV_STOP_UNDI stop_undi;
unsigned int retry;
int rc;
/* Allocate net device */
netdev = alloc_etherdev ( sizeof ( *undinic ) );
if ( ! netdev )
return -ENOMEM;
netdev_init ( netdev, &undinet_operations );
undinic = netdev->priv;
undi_set_drvdata ( undi, netdev );
netdev->dev = &undi->dev;
memset ( undinic, 0, sizeof ( *undinic ) );
undinet_entry = undi->entry;
DBGC ( undinic, "UNDINIC %p using UNDI %p\n", undinic, undi );
/* Hook in UNDI stack */
if ( ! ( undi->flags & UNDI_FL_STARTED ) ) {
memset ( &start_undi, 0, sizeof ( start_undi ) );
start_undi.AX = undi->pci_busdevfn;
start_undi.BX = undi->isapnp_csn;
start_undi.DX = undi->isapnp_read_port;
start_undi.ES = BIOS_SEG;
start_undi.DI = find_pnp_bios();
if ( ( rc = pxeparent_call ( undinet_entry, PXENV_START_UNDI,
&start_undi,
sizeof ( start_undi ) ) ) != 0 )
goto err_start_undi;
}
undi->flags |= UNDI_FL_STARTED;
/* Bring up UNDI stack */
if ( ! ( undi->flags & UNDI_FL_INITIALIZED ) ) {
memset ( &undi_startup, 0, sizeof ( undi_startup ) );
if ( ( rc = pxeparent_call ( undinet_entry, PXENV_UNDI_STARTUP,
&undi_startup,
sizeof ( undi_startup ) ) ) != 0 )
goto err_undi_startup;
/* On some PXE stacks, PXENV_UNDI_INITIALIZE may fail
* due to a transient condition (e.g. media test
* failing because the link has only just come out of
* reset). We may therefore need to retry this call
* several times.
*/
for ( retry = 0 ; ; ) {
memset ( &undi_init, 0, sizeof ( undi_init ) );
if ( ( rc = pxeparent_call ( undinet_entry,
PXENV_UNDI_INITIALIZE,
&undi_init,
sizeof ( undi_init ))) ==0)
break;
if ( ++retry > UNDI_INITIALIZE_RETRY_MAX )
goto err_undi_initialize;
DBGC ( undinic, "UNDINIC %p retrying "
"PXENV_UNDI_INITIALIZE (retry %d)\n",
undinic, retry );
/* Delay to allow link to settle if necessary */
mdelay ( UNDI_INITIALIZE_RETRY_DELAY_MS );
}
}
undi->flags |= UNDI_FL_INITIALIZED;
/* Get device information */
memset ( &undi_info, 0, sizeof ( undi_info ) );
if ( ( rc = pxeparent_call ( undinet_entry, PXENV_UNDI_GET_INFORMATION,
&undi_info, sizeof ( undi_info ) ) ) != 0 )
goto err_undi_get_information;
memcpy ( netdev->hw_addr, undi_info.PermNodeAddress, ETH_ALEN );
memcpy ( netdev->ll_addr, undi_info.CurrentNodeAddress, ETH_ALEN );
undinic->irq = undi_info.IntNumber;
if ( undinic->irq > IRQ_MAX ) {
DBGC ( undinic, "UNDINIC %p has invalid IRQ %d\n",
undinic, undinic->irq );
rc = -EINVAL;
goto err_bad_irq;
}
DBGC ( undinic, "UNDINIC %p has MAC address %s and IRQ %d\n",
undinic, eth_ntoa ( netdev->hw_addr ), undinic->irq );
/* Get interface information */
memset ( &undi_iface, 0, sizeof ( undi_iface ) );
if ( ( rc = pxeparent_call ( undinet_entry, PXENV_UNDI_GET_IFACE_INFO,
&undi_iface,
sizeof ( undi_iface ) ) ) != 0 )
goto err_undi_get_iface_info;
DBGC ( undinic, "UNDINIC %p has type %s, speed %d, flags %08x\n",
undinic, undi_iface.IfaceType, undi_iface.LinkSpeed,
undi_iface.ServiceFlags );
if ( ( undi_iface.ServiceFlags & SUPPORTED_IRQ ) &&
( undinic->irq != 0 ) ) {
undinic->irq_supported = 1;
}
DBGC ( undinic, "UNDINIC %p using %s mode\n", undinic,
( undinic->irq_supported ? "interrupt" : "polling" ) );
if ( strncmp ( ( ( char * ) undi_iface.IfaceType ), "Etherboot",
sizeof ( undi_iface.IfaceType ) ) == 0 ) {
DBGC ( undinic, "UNDINIC %p Etherboot 5.4 workaround enabled\n",
undinic );
undinic->hacks |= UNDI_HACK_EB54;
}
if ( undinet_irq_is_broken ( undi ) ) {
DBGC ( undinic, "UNDINIC %p forcing polling mode due to "
"broken interrupts\n", undinic );
undinic->irq_supported = 0;
}
/* Register network device */
if ( ( rc = register_netdev ( netdev ) ) != 0 )
goto err_register;
/* Mark as link up; we don't handle link state */
netdev_link_up ( netdev );
DBGC ( undinic, "UNDINIC %p added\n", undinic );
return 0;
err_register:
err_undi_get_iface_info:
err_bad_irq:
err_undi_get_information:
err_undi_initialize:
/* Shut down UNDI stack */
memset ( &undi_shutdown, 0, sizeof ( undi_shutdown ) );
pxeparent_call ( undinet_entry, PXENV_UNDI_SHUTDOWN, &undi_shutdown,
sizeof ( undi_shutdown ) );
memset ( &undi_cleanup, 0, sizeof ( undi_cleanup ) );
pxeparent_call ( undinet_entry, PXENV_UNDI_CLEANUP, &undi_cleanup,
sizeof ( undi_cleanup ) );
undi->flags &= ~UNDI_FL_INITIALIZED;
err_undi_startup:
/* Unhook UNDI stack */
memset ( &stop_undi, 0, sizeof ( stop_undi ) );
pxeparent_call ( undinet_entry, PXENV_STOP_UNDI, &stop_undi,
sizeof ( stop_undi ) );
undi->flags &= ~UNDI_FL_STARTED;
err_start_undi:
netdev_nullify ( netdev );
netdev_put ( netdev );
undi_set_drvdata ( undi, NULL );
return rc;
}
/**
* Remove UNDI device
*
* @v undi UNDI device
*/
void undinet_remove ( struct undi_device *undi ) {
struct net_device *netdev = undi_get_drvdata ( undi );
struct undi_nic *undinic = netdev->priv;
struct s_PXENV_UNDI_SHUTDOWN undi_shutdown;
struct s_PXENV_UNDI_CLEANUP undi_cleanup;
struct s_PXENV_STOP_UNDI stop_undi;
/* Unregister net device */
unregister_netdev ( netdev );
/* If we are preparing for an OS boot, or if we cannot exit
* via the PXE stack, then shut down the PXE stack.
*/
if ( ! ( undi->flags & UNDI_FL_KEEP_ALL ) ) {
/* Shut down UNDI stack */
memset ( &undi_shutdown, 0, sizeof ( undi_shutdown ) );
pxeparent_call ( undinet_entry, PXENV_UNDI_SHUTDOWN,
&undi_shutdown, sizeof ( undi_shutdown ) );
memset ( &undi_cleanup, 0, sizeof ( undi_cleanup ) );
pxeparent_call ( undinet_entry, PXENV_UNDI_CLEANUP,
&undi_cleanup, sizeof ( undi_cleanup ) );
undi->flags &= ~UNDI_FL_INITIALIZED;
/* Unhook UNDI stack */
memset ( &stop_undi, 0, sizeof ( stop_undi ) );
pxeparent_call ( undinet_entry, PXENV_STOP_UNDI, &stop_undi,
sizeof ( stop_undi ) );
undi->flags &= ~UNDI_FL_STARTED;
}
/* Clear entry point */
memset ( &undinet_entry, 0, sizeof ( undinet_entry ) );
/* Free network device */
netdev_nullify ( netdev );
netdev_put ( netdev );
DBGC ( undinic, "UNDINIC %p removed\n", undinic );
}
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