linux-kernel - [PATCH net-next v1 4/4] net-e1000e: Report carrier in loopback mode

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Message-Id: <48f59d610f896ece906e0e03491fd51ceeb4b43a.1321917278.git.david.decotigny@google.com>
Date:	Mon, 21 Nov 2011 15:20:00 -0800
From:	David Decotigny <david.decotigny@...gle.com>
To:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Bruce Allan <bruce.w.allan@...el.com>,
	Carolyn Wyborny <carolyn.wyborny@...el.com>,
	Don Skidmore <donald.c.skidmore@...el.com>,
	Greg Rose <gregory.v.rose@...el.com>,
	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>,
	Alex Duyck <alexander.h.duyck@...el.com>,
	John Ronciak <john.ronciak@...el.com>,
	e1000-devel@...ts.sourceforge.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc:	David Decotigny <david.decotigny@...gle.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Ian Campbell <ian.campbell@...rix.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Maciej Żenczykowski <zenczykowski@...il.com>
Subject: [PATCH net-next v1 4/4] net-e1000e: Report carrier in loopback mode

From: Maciej Żenczykowski <zenczykowski@...il.com>

When interface is configured in loopback mode, force carrier check
positive.  This is useful when interface does not have carrier and
test puts the interface in loopback mode.

Tested: pktgen loopback on 80003ES2LAN


Signed-off-by: David Decotigny <david.decotigny@...gle.com>
---
 drivers/net/ethernet/intel/e1000e/phy.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/drivers/net/ethernet/intel/e1000e/phy.c b/drivers/net/ethernet/intel/e1000e/phy.c
index f487a7f..9476c8f 100644
--- a/drivers/net/ethernet/intel/e1000e/phy.c
+++ b/drivers/net/ethernet/intel/e1000e/phy.c
@@ -1781,6 +1781,11 @@ s32 e1000e_phy_has_link_generic(struct e1000_hw *hw, u32 iterations,
 	u16 phy_reg;
 	int good_reads_phy_status = 0;
 
+	/* If loopback is enabled, we claim the link is up */
+	if ((0 == e1e_rphy(hw, PHY_CONTROL, &phy_reg))
+	    && (phy_reg & MII_CR_LOOPBACK)) {
+		*success = true;
+		return 0;
 	}
 
 	/*
-- 
1.7.3.1

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