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ixgbe: dcb: IEEE PFC stats and reset logic incorrect 

PFC stats are only tabulated when PFC is enabled. However in IEEE
mode the ieee_pfc pfc_tc bits were not checked and the calculation
was aborted.

This results in statistics not being reported through ethtool and
possible a false Tx hang occurring when receiving pause frames.

Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
Tested-by: Ross Brattain <ross.b.brattain@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
John Fastabend 2012-04-23 22:27:28 +00:00 committed by Jeff Kirsher
parent a61d3d1422
commit e1abc1bb85
2 changed files with 12 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/net/ethernet/intel/ixgbe/ixgbe_dcb_nl.c
View File

@ -662,6 +662,13 @@ static int ixgbe_dcbnl_ieee_setpfc(struct net_device *dev,
return -ENOMEM;
}
if (pfc->pfc_en) {
adapter->last_lfc_mode = adapter->hw.fc.current_mode;
adapter->hw.fc.current_mode = ixgbe_fc_pfc;
} else {
adapter->hw.fc.current_mode = adapter->last_lfc_mode;
}
prio_tc = adapter->ixgbe_ieee_ets->prio_tc;
memcpy(adapter->ixgbe_ieee_pfc, pfc, sizeof(*adapter->ixgbe_ieee_pfc));
return ixgbe_dcb_hw_pfc_config(&adapter->hw, pfc->pfc_en, prio_tc);

6
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
View File

@ -637,7 +637,11 @@ static void ixgbe_update_xoff_received(struct ixgbe_adapter *adapter)
clear_bit(__IXGBE_HANG_CHECK_ARMED,
&adapter->tx_ring[i]->state);
return;
} else if (!(adapter->dcb_cfg.pfc_mode_enable))
} else if (((adapter->dcbx_cap & DCB_CAP_DCBX_VER_CEE) &&
!(adapter->dcb_cfg.pfc_mode_enable)) ||
((adapter->dcbx_cap & DCB_CAP_DCBX_VER_IEEE) &&
adapter->ixgbe_ieee_pfc &&
!(adapter->ixgbe_ieee_pfc->pfc_en)))
return;
/* update stats for each tc, only valid with PFC enabled */