Commit 37289d9c authored by Bruce Allan's avatar Bruce Allan Committed by David S. Miller

e1000e: workaround a Tx hang on 82577/82578

With bi-directional stress traffic, the receiver could hang causing the
hardware to stop and a "Detected Tx Unit Hang" message dumped to the system
logfile.  Temporarily workaround this issue by disabling Tx flow control by
default.  The issue is currently being investigated and a follow-on patch
will be provided to revert this when it is resolved.
Signed-off-by: default avatarBruce Allan <bruce.w.allan@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent a4f58f54
...@@ -2348,8 +2348,13 @@ static s32 e1000_setup_link_ich8lan(struct e1000_hw *hw) ...@@ -2348,8 +2348,13 @@ static s32 e1000_setup_link_ich8lan(struct e1000_hw *hw)
* the default flow control setting, so we explicitly * the default flow control setting, so we explicitly
* set it to full. * set it to full.
*/ */
if (hw->fc.requested_mode == e1000_fc_default) if (hw->fc.requested_mode == e1000_fc_default) {
hw->fc.requested_mode = e1000_fc_full; /* Workaround h/w hang when Tx flow control enabled */
if (hw->mac.type == e1000_pchlan)
hw->fc.requested_mode = e1000_fc_rx_pause;
else
hw->fc.requested_mode = e1000_fc_full;
}
/* /*
* Save off the requested flow control mode for use later. Depending * Save off the requested flow control mode for use later. Depending
......
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