netdev - [net-next-2.6 PATCH 3/3] e1000e: update to workaround for jumbo frames on 82577

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Message-ID: <20100803002748.4179.85660.stgit@localhost.localdomain>
Date:	Mon, 02 Aug 2010 17:27:50 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org, gospo@...hat.com, bphilips@...ell.com,
	Bruce Allan <bruce.w.allan@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next-2.6 PATCH 3/3] e1000e: update to workaround for jumbo
	frames on 82577

From: Bruce Allan <bruce.w.allan@...el.com>

For OEM systems with this part that also has Spread Spectrum Clocking (SSC)
enabled in the BIOS, there is an Rx performance issue with 4K jumbo frames.
Leaving the defaults in PHY page 770 register 26 resolves the issue, and
does not negatively impact jumbo frames on systems with SSC disabled.

Signed-off-by: Bruce Allan <bruce.w.allan@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---

 drivers/net/e1000e/netdev.c |    5 -----
 1 files changed, 0 insertions(+), 5 deletions(-)

diff --git a/drivers/net/e1000e/netdev.c b/drivers/net/e1000e/netdev.c
index 9e9164a..cc97b58 100644
--- a/drivers/net/e1000e/netdev.c
+++ b/drivers/net/e1000e/netdev.c
@@ -2727,11 +2727,6 @@ static void e1000_setup_rctl(struct e1000_adapter *adapter)
 	if ((hw->phy.type == e1000_phy_82577) && (rctl & E1000_RCTL_LPE)) {
 		u16 phy_data;
 
-		e1e_rphy(hw, PHY_REG(770, 26), &phy_data);
-		phy_data &= 0xfff8;
-		phy_data |= (1 << 2);
-		e1e_wphy(hw, PHY_REG(770, 26), phy_data);
-
 		e1e_rphy(hw, 22, &phy_data);
 		phy_data &= 0x0fff;
 		phy_data |= (1 << 14);

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