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e1000e: suggest a possible workaround to a device hang on 82577/8

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There is a known issue in the 82577 and 82578 device that can cause a hang
in the device hardware during traffic stress; the current workaround in the
driver is to disable transmit flow control by default.  If the user enables
transmit flow control and the device hang occurs, provide a message in the
syslog suggesting to re-enable the workaround.

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Tested-by: Jeff Pieper <jeffrey.e.pieper@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Bruce Allan 2012-03-20 03:48:08 +00:00 committed by Jeff Kirsher
parent af94bf6db1
commit 7c0427ee76
1 changed files with 4 additions and 0 deletions
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drivers/net/ethernet/intel/e1000e/netdev.c
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@ -1084,6 +1084,10 @@ static void e1000_print_hw_hang(struct work_struct *work)
phy_1000t_status, phy_1000t_status,
phy_ext_status, phy_ext_status,
pci_status); pci_status);
/* Suggest workaround for known h/w issue */
if ((hw->mac.type == e1000_pchlan) && (er32(CTRL) & E1000_CTRL_TFCE))
e_err("Try turning off Tx pause (flow control) via ethtool\n");
} }
/** /**