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Commit a626e847 authored by Don Skidmore's avatar Don Skidmore Committed by David S. Miller
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ixgbe: Fix - Do not allow Rx FC on 82598 at 1G due to errata 



The 82598 has an erratum that receipt of pause frames at 1G
could lead to a Tx Hang.  To avoid this this patch disables
Rx FC while at 1G speed for all 82598 parts.

Signed-off-by: default avatarDon Skidmore <donald.c.skidmore@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 3d0beb92

drivers/net/ixgbe/ixgbe_82598.c

+22 −0
Original line number Diff line number Diff line
@@ -357,12 +357,34 @@ static s32 ixgbe_fc_enable_82598(struct ixgbe_hw *hw, s32 packetbuf_num) 
	u32 fctrl_reg;

	u32 rmcs_reg;

	u32 reg;

	u32 link_speed = 0;

	bool link_up;



#ifdef CONFIG_DCB

	if (hw->fc.requested_mode == ixgbe_fc_pfc)

		goto out;



#endif /* CONFIG_DCB */

	/*

	 * On 82598 having Rx FC on causes resets while doing 1G

	 * so if it's on turn it off once we know link_speed. For

	 * more details see 82598 Specification update.

	 */

	hw->mac.ops.check_link(hw, &link_speed, &link_up, false);

	if (link_up && link_speed == IXGBE_LINK_SPEED_1GB_FULL) {

		switch (hw->fc.requested_mode) {

		case ixgbe_fc_full:

			hw->fc.requested_mode = ixgbe_fc_tx_pause;

			break;

		case ixgbe_fc_rx_pause:

			hw->fc.requested_mode = ixgbe_fc_none;

			break;

		default:

			/* no change */

			break;

		}

	}



	/* Negotiate the fc mode to use */

	ret_val = ixgbe_fc_autoneg(hw);

	if (ret_val)