From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Kirsher Subject: [net-2.6 PATCH 1/2] ixgbe: Fix - Do not allow Rx FC on 82598 at 1G due to errata Date: Thu, 11 Feb 2010 06:13:49 -0800 Message-ID: <20100211141319.25672.3041.stgit@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org, gospo@redhat.com, Don Skidmore , Jeff Kirsher To: davem@davemloft.net Return-path: Received: from qmta14.emeryville.ca.mail.comcast.net ([76.96.27.212]:56620 "EHLO qmta14.emeryville.ca.mail.comcast.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753054Ab0BKOOI (ORCPT ); Thu, 11 Feb 2010 09:14:08 -0500 Sender: netdev-owner@vger.kernel.org List-ID: From: Don Skidmore 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: Don Skidmore Signed-off-by: Jeff Kirsher --- drivers/net/ixgbe/ixgbe_82598.c | 22 ++++++++++++++++++++++ 1 files changed, 22 insertions(+), 0 deletions(-) diff --git a/drivers/net/ixgbe/ixgbe_82598.c b/drivers/net/ixgbe/ixgbe_82598.c index 3103f41..35a06b4 100644 --- a/drivers/net/ixgbe/ixgbe_82598.c +++ b/drivers/net/ixgbe/ixgbe_82598.c @@ -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)