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[intel] Force RX polling on VMware emulated 82545em

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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>
This commit is contained in:
Michael Brown
2015-04-21 16:43:30 +01:00
parent 63dcab002e
commit 8958f62a1c
2 changed files with 13 additions and 1 deletions
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10
src/drivers/net/intel.c
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@@ -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 ),