From 6b8456c0199c4dd35bb7a04ff299ab925699e390 Mon Sep 17 00:00:00 2001 From: John Fastabend Date: Wed, 21 Sep 2011 14:44:10 +0000 Subject: ixgbe: X540 devices RX PFC frames pause traffic even if disabled Receiving PFC (priority flow control) frames while the feature is off should not pause the traffic class. On the X540 devices the traffic class react to frames if it was previously enabled because the field is incorrectly cleared. Signed-off-by: John Fastabend Tested-by: Ross Brattain Signed-off-by: Jeff Kirsher --- drivers/net/ethernet/intel/ixgbe/ixgbe_dcb_82599.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) (limited to 'drivers/net/ethernet/intel/ixgbe/ixgbe_dcb_82599.c') diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_dcb_82599.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_dcb_82599.c index 45fe71030455..32cd97bc794d 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_dcb_82599.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_dcb_82599.c @@ -271,13 +271,23 @@ s32 ixgbe_dcb_config_pfc_82599(struct ixgbe_hw *hw, u8 pfc_en, u8 *prio_tc) reg |= IXGBE_MFLCN_RPFCE | IXGBE_MFLCN_DPF; if (hw->mac.type == ixgbe_mac_X540) { - reg &= ~(IXGBE_MFLCN_RPFCE_MASK | 0x10); + reg &= ~IXGBE_MFLCN_RPFCE_MASK; reg |= pfc_en << IXGBE_MFLCN_RPFCE_SHIFT; } IXGBE_WRITE_REG(hw, IXGBE_MFLCN, reg); } else { + /* X540 devices have a RX bit that should be cleared + * if PFC is disabled on all TCs but PFC features is + * enabled. + */ + if (hw->mac.type == ixgbe_mac_X540) { + reg = IXGBE_READ_REG(hw, IXGBE_MFLCN); + reg &= ~IXGBE_MFLCN_RPFCE_MASK; + IXGBE_WRITE_REG(hw, IXGBE_MFLCN, reg); + } + for (i = 0; i < MAX_TRAFFIC_CLASS; i++) hw->mac.ops.fc_enable(hw, i); } -- cgit v1.2.1