e1000: omit stats for broken counter in 82543

The 82543 chip does not count tx_carrier_errors properly in FD mode;
report zeros instead of garbage.

Originally from Jesse Brandeburg <jesse.brandeburg@intel.com>, rewritten
to use feature flags by me.

Signed-off-by: Jeff Garzik <jeff@garzik.org>

diff --git a/drivers/net/e1000/e1000_hw.c b/drivers/net/e1000/e1000_hw.c
index 0201ca5..ce82eb5 100644 (file)
--- a/drivers/net/e1000/e1000_hw.c
+++ b/drivers/net/e1000/e1000_hw.c
@@ -442,6 +442,12 @@ e1000_set_mac_type(struct e1000_hw *hw)
                break;
        }
 
+       /* The 82543 chip does not count tx_carrier_errors properly in
+        * FD mode
+        */
+       if (hw->mac_type == e1000_82543)
+               hw->bad_tx_carr_stats_fd = TRUE;
+
        return E1000_SUCCESS;
 }
 

diff --git a/drivers/net/e1000/e1000_hw.h b/drivers/net/e1000/e1000_hw.h
index 28cdfe3..fef1f7b 100644 (file)
--- a/drivers/net/e1000/e1000_hw.h
+++ b/drivers/net/e1000/e1000_hw.h
@@ -1460,6 +1460,7 @@ struct e1000_hw {
        boolean_t               mng_reg_access_disabled;
        boolean_t               leave_av_bit_off;
        boolean_t               kmrn_lock_loss_workaround_disabled;
+       boolean_t               bad_tx_carr_stats_fd;
 };
 
 

diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index 62ef267..0816de2 100644 (file)
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -3581,6 +3581,11 @@ e1000_update_stats(struct e1000_adapter *adapter)
        adapter->net_stats.tx_aborted_errors = adapter->stats.ecol;
        adapter->net_stats.tx_window_errors = adapter->stats.latecol;
        adapter->net_stats.tx_carrier_errors = adapter->stats.tncrs;
+       if (adapter->hw.bad_tx_carr_stats_fd &&
+           adapter->link_duplex == FULL_DUPLEX) {
+               adapter->net_stats.tx_carrier_errors = 0;
+               adapter->stats.tncrs = 0;
+       }
 
        /* Tx Dropped needs to be maintained elsewhere */