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authorBruce Allan <bruce.w.allan@intel.com>2009-06-02 11:29:37 +0000
committerDavid S. Miller <davem@davemloft.net>2009-06-03 02:46:36 -0700
commit37289d9c1e72a186ea5f28bee79efeb1d4e7309c (patch)
tree429af3e67d9f5d91cf472e40fd1039e6cffe3e69
parenta4f58f5455ba0efda36fb33c37074922d1527a10 (diff)
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>
-rw-r--r--drivers/net/e1000e/ich8lan.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/net/e1000e/ich8lan.c b/drivers/net/e1000e/ich8lan.c
index b69c8190da3..9e23f50fb9c 100644
--- a/drivers/net/e1000e/ich8lan.c
+++ b/drivers/net/e1000e/ich8lan.c
@@ -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)
- hw->fc.requested_mode = e1000_fc_full;
+ 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