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

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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: Bruce Allan <bruce.w.allan@intel.com>
Tested-by: Jeff Pieper <jeffrey.e.pieper@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Bruce Allan 2012-12-08 00:35:35 +00:00 committed by Jeff Kirsher
parent a8fc18910b
commit 347b5201cb
1 changed files with 9 additions and 6 deletions
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15
drivers/net/ethernet/intel/e1000e/netdev.c
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@ -3724,14 +3724,17 @@ void e1000e_reset(struct e1000_adapter *adapter)
break;
case e1000_pch2lan:
case e1000_pch_lpt:
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);
if (adapter->netdev->mtu <= ETH_DATA_LEN) {
fc->high_water = 0x05C20;
fc->low_water = 0x05048;
fc->pause_time = 0x0650;
break;
}
fc->high_water = ((pba << 10) * 9 / 10) & E1000_FCRTH_RTH;
fc->low_water = ((pba << 10) * 8 / 10) & E1000_FCRTL_RTL;
break;
}