diff options
| author | John Fastabend <john.r.fastabend@intel.com> | 2011-08-23 07:14:22 +0400 |
|---|---|---|
| committer | Jeff Kirsher <jeffrey.t.kirsher@intel.com> | 2011-09-29 10:09:59 +0400 |
| commit | 9da712d2ede7e3e3a0da180351505310ee271773 (patch) | |
| tree | b1892a255c4d20c71b66d8a96c0554cc42463863 /drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c | |
| parent | 934c18cc5a2318f525a187e77a46d559d3b8cb44 (diff) | |
| download | linux-9da712d2ede7e3e3a0da180351505310ee271773.tar.xz | |
ixgbe: update {P}FC thresholds to account for X540 and loopback
Revise high and low threshold marks wrt flow control to account
for the X540 devices and latency introduced by the loopback
switch.
Without this it was in theory possible to drop frames on a
supposedly lossless link with X540 or SR-IOV enabled.
Previously we used a magic number in a define to calculate the
threshold values. This made it difficult to sort out exactly
which latencies were or were not being accounted for. Here
I was overly explicit and tried to used #define names that would
be recognizable after reading the IEEE 802.1Qbb specification.
Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
Tested-by: Ross Brattain <ross.b.brattain@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Diffstat (limited to 'drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c')
| -rw-r--r-- | drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c | 8 |
1 files changed, 2 insertions, 6 deletions
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c index b816a624a6ce..fa079bbab89a 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c @@ -358,7 +358,6 @@ static s32 ixgbe_fc_enable_82598(struct ixgbe_hw *hw, s32 packetbuf_num) u32 fctrl_reg; u32 rmcs_reg; u32 reg; - u32 rx_pba_size; u32 link_speed = 0; bool link_up; @@ -461,16 +460,13 @@ static s32 ixgbe_fc_enable_82598(struct ixgbe_hw *hw, s32 packetbuf_num) /* Set up and enable Rx high/low water mark thresholds, enable XON. */ if (hw->fc.current_mode & ixgbe_fc_tx_pause) { - rx_pba_size = IXGBE_READ_REG(hw, IXGBE_RXPBSIZE(packetbuf_num)); - rx_pba_size >>= IXGBE_RXPBSIZE_SHIFT; - - reg = (rx_pba_size - hw->fc.low_water) << 6; + reg = hw->fc.low_water << 6; if (hw->fc.send_xon) reg |= IXGBE_FCRTL_XONE; IXGBE_WRITE_REG(hw, IXGBE_FCRTL(packetbuf_num), reg); - reg = (rx_pba_size - hw->fc.high_water) << 6; + reg = hw->fc.high_water[packetbuf_num] << 6; reg |= IXGBE_FCRTH_FCEN; IXGBE_WRITE_REG(hw, IXGBE_FCRTH(packetbuf_num), reg); |