e1000e: low throughput using 4K jumbos on I218

Alter the packet buffer allocation accordingly.

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>

diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index 99596a6..51b05fe 100644 (file)
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -3819,6 +3819,8 @@ void e1000e_reset(struct e1000_adapter *adapter)
                        break;
                }
 
+               pba = 14;
+               ew32(PBA, pba);
                fc->high_water = ((pba << 10) * 9 / 10) & E1000_FCRTH_RTH;
                fc->low_water = ((pba << 10) * 8 / 10) & E1000_FCRTL_RTL;
                break;