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Commit 347b5201 authored by Bruce Allan's avatar Bruce Allan Committed by Jeff Kirsher
Browse files

e1000e: fix flow-control thresholds for jumbo frames on 82579/I217/I218 



The previous static flow-control thresholds were causing unnecessary pause
packets to be transmitted when jumbo frames are configured reducing the
throughput.

Signed-off-by: default avatarBruce Allan <bruce.w.allan@intel.com>
Tested-by: default avatarJeff Pieper <jeffrey.e.pieper@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
parent a8fc1891

drivers/net/ethernet/intel/e1000e/netdev.c

+9 −6
Original line number Diff line number Diff line
@@ -3724,14 +3724,17 @@ void e1000e_reset(struct e1000_adapter *adapter) 
		break;

	case e1000_pch2lan:

	case e1000_pch_lpt:

		fc->refresh_time = 0x0400;



		if (adapter->netdev->mtu <= ETH_DATA_LEN) {

			fc->high_water = 0x05C20;

			fc->low_water = 0x05048;

			fc->pause_time = 0x0650;

		fc->refresh_time = 0x0400;

		if (adapter->netdev->mtu > ETH_DATA_LEN) {

			pba = 14;

			ew32(PBA, pba);

			break;

		}



		fc->high_water = ((pba << 10) * 9 / 10) & E1000_FCRTH_RTH;

		fc->low_water = ((pba << 10) * 8 / 10) & E1000_FCRTL_RTL;

		break;

	}