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[intel] Poll RX queue if hardware reports RX overflow 

The Intel NIC emulation in some versions of VMware seems to suffer
from a flaw whereby the Interrupt Cause Register (ICR) fails to assert
the usual "packet received" bit (ICR.RXT0) if a receive overflow
(ICR.RXO) has also occurred.

Work around this flaw by polling for completed descriptors whenever
either ICR.RXT0 or ICR.RXO is asserted.

Reported-by: Miroslav Halas <miroslav.halas@bankofamerica.com>
Debugged-by: Miroslav Halas <miroslav.halas@bankofamerica.com>
Tested-by: Miroslav Halas <miroslav.halas@bankofamerica.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2012-10-25 16:09:09 -07:00
parent c4ee23e7c6
commit 0c5e3df6d9
1 changed files with 1 additions and 1 deletions
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2
src/drivers/net/intel.c
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@ -700,7 +700,7 @@ static void intel_poll ( struct net_device *netdev ) {
intel_poll_tx ( netdev );
/* Poll for RX completions, if applicable */
if ( icr & INTEL_IRQ_RXT0 )
if ( icr & ( INTEL_IRQ_RXT0 | INTEL_IRQ_RXO ) )
intel_poll_rx ( netdev );
/* Report receive overruns */