ixgbe: disable flow control by default
Since the adapter cannot tell what the remote end's flow control capability is through auto-neg, we must turn off flow control by default. Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
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@ -69,12 +69,12 @@
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/* flow control */
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#define IXGBE_DEFAULT_FCRTL 0x10000
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#define IXGBE_MIN_FCRTL 0
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#define IXGBE_MIN_FCRTL 0x40
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#define IXGBE_MAX_FCRTL 0x7FF80
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#define IXGBE_DEFAULT_FCRTH 0x20000
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#define IXGBE_MIN_FCRTH 0
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#define IXGBE_MIN_FCRTH 0x600
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#define IXGBE_MAX_FCRTH 0x7FFF0
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#define IXGBE_DEFAULT_FCPAUSE 0x6800 /* may be too long */
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#define IXGBE_DEFAULT_FCPAUSE 0xFFFF
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#define IXGBE_MIN_FCPAUSE 0
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#define IXGBE_MAX_FCPAUSE 0xFFFF
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@ -1064,6 +1064,13 @@ s32 ixgbe_setup_fc(struct ixgbe_hw *hw, s32 packetbuf_num)
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rmcs_reg = IXGBE_READ_REG(hw, IXGBE_RMCS);
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rmcs_reg &= ~(IXGBE_RMCS_TFCE_PRIORITY | IXGBE_RMCS_TFCE_802_3X);
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/*
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* 10 gig parts do not have a word in the EEPROM to determine the
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* default flow control setting, so we explicitly set it to full.
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*/
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if (hw->fc.type == ixgbe_fc_default)
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hw->fc.type = ixgbe_fc_full;
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/*
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* We want to save off the original Flow Control configuration just in
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* case we get disconnected and then reconnected into a different hub
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@ -1116,6 +1123,16 @@ s32 ixgbe_setup_fc(struct ixgbe_hw *hw, s32 packetbuf_num)
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IXGBE_WRITE_REG(hw, IXGBE_FCTRL, frctl_reg);
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IXGBE_WRITE_REG(hw, IXGBE_RMCS, rmcs_reg);
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/*
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* Check for invalid software configuration, zeros are completely
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* invalid for all parameters used past this point, and if we enable
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* flow control with zero water marks, we blast flow control packets.
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*/
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if (!hw->fc.low_water || !hw->fc.high_water || !hw->fc.pause_time) {
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hw_dbg(hw, "Flow control structure initialized incorrectly\n");
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return IXGBE_ERR_INVALID_LINK_SETTINGS;
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}
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/*
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* We need to set up the Receive Threshold high and low water
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* marks as well as (optionally) enabling the transmission of
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@ -2446,8 +2446,12 @@ static int __devinit ixgbe_sw_init(struct ixgbe_adapter *adapter)
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adapter->tx_eitr = 1;
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/* default flow control settings */
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hw->fc.original_type = ixgbe_fc_full;
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hw->fc.type = ixgbe_fc_full;
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hw->fc.original_type = ixgbe_fc_none;
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hw->fc.type = ixgbe_fc_none;
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hw->fc.high_water = IXGBE_DEFAULT_FCRTH;
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hw->fc.low_water = IXGBE_DEFAULT_FCRTL;
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hw->fc.pause_time = IXGBE_DEFAULT_FCPAUSE;
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hw->fc.send_xon = true;
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/* select 10G link by default */
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hw->mac.link_mode_select = IXGBE_AUTOC_LMS_10G_LINK_NO_AN;
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@ -3587,13 +3591,6 @@ static int __devinit ixgbe_probe(struct pci_dev *pdev,
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INIT_WORK(&adapter->reset_task, ixgbe_reset_task);
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/* initialize default flow control settings */
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hw->fc.original_type = ixgbe_fc_full;
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hw->fc.type = ixgbe_fc_full;
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hw->fc.high_water = IXGBE_DEFAULT_FCRTH;
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hw->fc.low_water = IXGBE_DEFAULT_FCRTL;
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hw->fc.pause_time = IXGBE_DEFAULT_FCPAUSE;
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err = ixgbe_init_interrupt_scheme(adapter);
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if (err)
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goto err_sw_init;
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