diff options
| -rw-r--r-- | drivers/net/e1000e/defines.h | 2 | ||||
| -rw-r--r-- | drivers/net/e1000e/netdev.c | 14 |
2 files changed, 10 insertions, 6 deletions
diff --git a/drivers/net/e1000e/defines.h b/drivers/net/e1000e/defines.h index 243aa499fe9..9acfecddb27 100644 --- a/drivers/net/e1000e/defines.h +++ b/drivers/net/e1000e/defines.h @@ -469,6 +469,8 @@ #define AUTO_READ_DONE_TIMEOUT 10 /* Flow Control */ +#define E1000_FCRTH_RTH 0x0000FFF8 /* Mask Bits[15:3] for RTH */ +#define E1000_FCRTL_RTL 0x0000FFF8 /* Mask Bits[15:3] for RTL */ #define E1000_FCRTL_XONE 0x80000000 /* Enable XON frame transmission */ /* Transmit Configuration Word */ diff --git a/drivers/net/e1000e/netdev.c b/drivers/net/e1000e/netdev.c index 7e412d1168e..b7a46c51378 100644 --- a/drivers/net/e1000e/netdev.c +++ b/drivers/net/e1000e/netdev.c @@ -2751,23 +2751,25 @@ void e1000e_reset(struct e1000_adapter *adapter) /* * flow control settings * - * The high water mark must be low enough to fit one full frame + * The high water mark must be low enough to fit two full frame * (or the size used for early receive) above it in the Rx FIFO. * Set it to the lower of: * - 90% of the Rx FIFO size, and * - the full Rx FIFO size minus the early receive size (for parts * with ERT support assuming ERT set to E1000_ERT_2048), or - * - the full Rx FIFO size minus one full frame + * - the full Rx FIFO size minus two full frames */ - if (adapter->flags & FLAG_HAS_ERT) + if ((adapter->flags & FLAG_HAS_ERT) && + (adapter->netdev->mtu > ETH_DATA_LEN)) hwm = min(((pba << 10) * 9 / 10), ((pba << 10) - (E1000_ERT_2048 << 3))); else hwm = min(((pba << 10) * 9 / 10), - ((pba << 10) - adapter->max_frame_size)); + ((pba << 10) - (2 * adapter->max_frame_size))); - fc->high_water = hwm & 0xFFF8; /* 8-byte granularity */ - fc->low_water = fc->high_water - 8; + fc->high_water = hwm & E1000_FCRTH_RTH; /* 8-byte granularity */ + fc->low_water = (fc->high_water - (2 * adapter->max_frame_size)); + fc->low_water &= E1000_FCRTL_RTL; /* 8-byte granularity */ if (adapter->flags & FLAG_DISABLE_FC_PAUSE_TIME) fc->pause_time = 0xFFFF; |