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e1000e: apply burst mode settings only on default

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Devices that support FLAG2_DMA_BURST have different default values
for RDTR and RADV. Apply burst mode default settings only when no
explicit value was passed at module load.

The RDTR default is zero. If the module is loaded for low latency
operation with RxIntDelay=0, do not override this value with a burst
default of 32.

Move the decision to apply burst values earlier, where explicitly
initialized module variables can be distinguished from defaults.

Signed-off-by: Willem de Bruijn <willemb@google.com>
Acked-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:
Willem de Bruijn
2017-08-25 11:06:26 -04:00
committed by Jeff Kirsher
parent b10effb92e
commit 48072ae1ec
3 changed files with 15 additions and 13 deletions
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4
drivers/net/ethernet/intel/e1000e/e1000.h
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@@ -94,10 +94,6 @@ struct e1000_info;
*/
#define E1000_CHECK_RESET_COUNT 25
#define DEFAULT_RDTR 0
#define DEFAULT_RADV 8
#define BURST_RDTR 0x20
#define BURST_RADV 0x20
#define PCICFG_DESC_RING_STATUS 0xe4
#define FLUSH_DESC_REQUIRED 0x100