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[undi] Work around specific devices with known broken interrupt behaviour

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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 a list of devices which will be treated as simply not supporting
interrupts.

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.

Reported-by: Richard Moore <rich@richud.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2013-03-05 14:22:53 +00:00
parent e27803e40f
commit 9373ca8ea2
1 changed files with 52 additions and 0 deletions
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52
src/arch/i386/drivers/net/undinet.c
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@ -531,6 +531,53 @@ static struct net_device_operations undinet_operations = {
.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
*
@ -647,6 +694,11 @@ int undinet_probe ( struct undi_device *undi ) {
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 )