[PATCH net-next v2 4/4] net-e1000e: Report carrier in loopback mode

[David Decotigny <david.decotigny@google.com>]

From: Maciej Żenczykowski <zenczykowski@gmail.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@google.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