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igb: Add support for ethtool private flag to allow use of legacy Rx

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Since there are potential drawbacks to the new Rx allocation approach I
thought it best to add a "chicken bit" so that we can turn the feature off
if in the event that a problem is found.

It also provides a means of validating the legacy Rx path in the event that
we are forced to fall back.  At some point in the future when we are
convinced we don't need it anymore we might be able to drop the legacy-rx
flag.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Alexander Duyck
2017-02-06 18:26:52 -08:00
committed by Jeff Kirsher
parent 3456fd5342
commit e08912985b
2 changed files with 49 additions and 0 deletions
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drivers/net/ethernet/intel/igb/igb.h
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@@ -557,6 +557,7 @@ struct igb_adapter {
#define IGB_FLAG_HAS_MSIX BIT(13)
#define IGB_FLAG_EEE BIT(14)
#define IGB_FLAG_VLAN_PROMISC BIT(15)
#define IGB_FLAG_RX_LEGACY BIT(16)
/* Media Auto Sense */
#define IGB_MAS_ENABLE_0 0X0001