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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: Matthew Vick <matthew.vick@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:
Matthew Vick 2012-04-14 05:20:32 +00:00 committed by Jeff Kirsher
parent a3060858c2
commit 0c02dd983f
2 changed files with 5 additions and 0 deletions
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2
drivers/net/ethernet/intel/igb/e1000_defines.h
View File

@ -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 */

3
drivers/net/ethernet/intel/igb/igb_main.c
View File

@ -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);
/*