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Commit 0c02dd98 authored by Matthew Vick's avatar Matthew Vick Committed by Jeff Kirsher
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igb: Disable the BMC-to-OS Watchdog Enable bit for DMAC. 



Under certain scenarios, it's possible that bursty manageability traffic
over the BMC-to-OS path may overrun the internal manageability receive
buffer causing dropped manageability packets. Clearing this bit prevents
this situation by interrupting coalescing to allow manageability traffic
through.

Signed-off-by: default avatarMatthew Vick <matthew.vick@intel.com>
Tested-by: default avatarAaron Brown <aaron.f.brown@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
parent a3060858

drivers/net/ethernet/intel/igb/e1000_defines.h

+2 −0
Original line number Diff line number Diff line
@@ -301,6 +301,8 @@ 
							* transactions */

#define E1000_DMACR_DMAC_LX_SHIFT       28

#define E1000_DMACR_DMAC_EN             0x80000000 /* Enable DMA Coalescing */

/* DMA Coalescing BMC-to-OS Watchdog Enable */

#define E1000_DMACR_DC_BMC2OSW_EN	0x00008000



#define E1000_DMCTXTH_DMCTTHR_MASK      0x00000FFF /* DMA Coalescing Transmit

							* Threshold */

drivers/net/ethernet/intel/igb/igb_main.c

+3 −0
Original line number Diff line number Diff line
@@ -7147,6 +7147,9 @@ static void igb_init_dmac(struct igb_adapter *adapter, u32 pba) 


			/* watchdog timer= +-1000 usec in 32usec intervals */

			reg |= (1000 >> 5);



			/* Disable BMC-to-OS Watchdog Enable */

			reg &= ~E1000_DMACR_DC_BMC2OSW_EN;

			wr32(E1000_DMACR, reg);



			/*