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[intel] Force RX polling on VMware emulated 82545em 

The emulated Intel 82545em in some versions of VMware (observed with
ESXi v5.1) seems to sometimes fail to set the RXT0 bit in the
interrupt cause register (ICR), causing iPXE to stop receiving
packets.  Work around this problem (for the 82545em only) by always
polling the receive queue regardless of the state of the ICR.

Reported-by: Slava Bendersky <volga629@networklab.ca>
Tested-by: Slava Bendersky <volga629@networklab.ca>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/36/head
Michael Brown 2015-04-21 16:43:30 +01:00
parent 63dcab002e
commit 8958f62a1c
2 changed files with 13 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
src/drivers/net/intel.c
View File

@ -572,6 +572,13 @@ static int intel_open ( struct net_device *netdev ) {
/* Update link state */
intel_check_link ( netdev );
/* Apply required errata */
if ( intel->flags & INTEL_VMWARE ) {
DBGC ( intel, "INTEL %p applying VMware errata workaround\n",
intel );
intel->force_icr = INTEL_IRQ_RXT0;
}
return 0;
intel_destroy_ring ( intel, &intel->rx );
@ -740,6 +747,7 @@ static void intel_poll ( struct net_device *netdev ) {
icr = readl ( intel->regs + INTEL_ICR );
profile_stop ( &intel_vm_poll_profiler );
profile_exclude ( &intel_vm_poll_profiler );
icr |= intel->force_icr;
if ( ! icr )
return;
@ -907,7 +915,7 @@ static struct pci_device_id intel_nics[] = {
PCI_ROM ( 0x8086, 0x100c, "82544gc", "82544GC (Copper)", 0 ),
PCI_ROM ( 0x8086, 0x100d, "82544gc-l", "82544GC (LOM)", 0 ),
PCI_ROM ( 0x8086, 0x100e, "82540em", "82540EM", 0 ),
PCI_ROM ( 0x8086, 0x100f, "82545em", "82545EM (Copper)", 0 ),
PCI_ROM ( 0x8086, 0x100f, "82545em", "82545EM (Copper)", INTEL_VMWARE ),
PCI_ROM ( 0x8086, 0x1010, "82546eb", "82546EB (Copper)", 0 ),
PCI_ROM ( 0x8086, 0x1011, "82545em-f", "82545EM (Fiber)", 0 ),
PCI_ROM ( 0x8086, 0x1012, "82546eb-f", "82546EB (Fiber)", 0 ),

4
src/drivers/net/intel.h
View File

@ -233,6 +233,8 @@ struct intel_nic {
unsigned int port;
/** Flags */
unsigned int flags;
/** Forced interrupts */
unsigned int force_icr;
/** EEPROM */
struct nvs_device eeprom;
@ -253,6 +255,8 @@ struct intel_nic {
enum intel_flags {
/** PBS/PBA errata workaround required */
INTEL_PBS_ERRATA = 0x0001,
/** VMware missing interrupt workaround required */
INTEL_VMWARE = 0x0002,
};
extern int intel_create_ring ( struct intel_nic *intel,