Commit 37289d9c authored Jun 02, 2009 by Bruce Allan Committed by David S. Miller Jun 03, 2009

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: Bruce Allan <bruce.w.allan@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent a4f58f54

drivers/net/e1000e/ich8lan.c

+7 −2

Original line number	Diff line number	Diff line
		@@ -2348,8 +2348,13 @@ static s32 e1000_setup_link_ich8lan(struct e1000_hw *hw)
		* the default flow control setting, so we explicitly
		* set it to full.
		*/
		if (hw->fc.requested_mode == e1000_fc_default)
		if (hw->fc.requested_mode == e1000_fc_default) {
		/* 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