diff options
| author | Michael Brown <mcb30@ipxe.org> | 2019-04-22 14:43:23 +0100 |
|---|---|---|
| committer | Michael Brown <mcb30@ipxe.org> | 2019-04-24 11:41:38 +0100 |
| commit | afee77d816f42c7e405c065395c6a7f4dc2aade1 (patch) | |
| tree | d7a248ae2c5039622e5bbbee98fb31d0b65e7fc0 /src/include/ipxe/errfile.h | |
| parent | ebf2eaf515e46abd43bc798e7e4ba77bfe529218 (diff) | |
| download | ipxe-afee77d816f42c7e405c065395c6a7f4dc2aade1.tar.gz | |
[pci] Add support for PCI MSI-X interrupts
The Intel 40 Gigabit Ethernet virtual functions support only MSI-X
interrupts, and will write back completed interrupt descriptors only
when the device attempts to raise an interrupt (or when a complete
cacheline of receive descriptors has been completed).
We cannot actually use MSI-X interrupts within iPXE, since we never
have ownership of the APIC. However, an MSI-X interrupt is
fundamentally just a DMA write of a single dword to an arbitrary
address. We can therefore configure the device to "raise" an
interrupt by writing a meaningless value to an otherwise unused memory
location: this is sufficient to trigger the receive descriptor
writeback logic.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Diffstat (limited to 'src/include/ipxe/errfile.h')
| -rw-r--r-- | src/include/ipxe/errfile.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/include/ipxe/errfile.h b/src/include/ipxe/errfile.h index ce67fc66d..02e13d11b 100644 --- a/src/include/ipxe/errfile.h +++ b/src/include/ipxe/errfile.h @@ -205,6 +205,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); #define ERRFILE_ena ( ERRFILE_DRIVER | 0x00c90000 ) #define ERRFILE_icplus ( ERRFILE_DRIVER | 0x00ca0000 ) #define ERRFILE_intelxl ( ERRFILE_DRIVER | 0x00cb0000 ) +#define ERRFILE_pcimsix ( ERRFILE_DRIVER | 0x00cc0000 ) #define ERRFILE_aoe ( ERRFILE_NET | 0x00000000 ) #define ERRFILE_arp ( ERRFILE_NET | 0x00010000 ) |