From: Arjun Vynipadath <arjun@chelsio.com>
Date: Thu, 1 Mar 2018 15:01:04 +0530
Subject: cxgb4vf: Forcefully link up virtual interfaces
Patch-mainline: v4.17-rc1
Git-commit: 0913667ab3ad9e6c1797384410a0755757bcee55
References: bsc#1097585 bsc#1097586 bsc#1097587 bsc#1097588 bsc#1097583 bsc#1097584

The Virtual Interfaces are connected to an internal switch on the chip
which allows VIs attached to the same port to talk to each other even
when the port link is down.  As a result, we generally want to always
report a VI's link as being "up".

Based on the original work by: Casey Leedom <leedom@chelsio.com>
Signed-off-by: Arjun Vynipadath <arjun@chelsio.com>
Signed-off-by: Ganesh Goudar <ganeshgr@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/chelsio/cxgb4vf/cxgb4vf_main.c |   14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

--- a/drivers/net/ethernet/chelsio/cxgb4vf/cxgb4vf_main.c
+++ b/drivers/net/ethernet/chelsio/cxgb4vf/cxgb4vf_main.c
@@ -155,8 +155,6 @@ void t4vf_os_link_changed(struct adapter
 		const char *fc;
 		const struct port_info *pi = netdev_priv(dev);
 
-		netif_carrier_on(dev);
-
 		switch (pi->link_cfg.speed) {
 		case 100:
 			s = "100Mbps";
@@ -202,7 +200,6 @@ void t4vf_os_link_changed(struct adapter
 
 		netdev_info(dev, "link up, %s, full-duplex, %s PAUSE\n", s, fc);
 	} else {
-		netif_carrier_off(dev);
 		netdev_info(dev, "link down\n");
 	}
 }
@@ -278,6 +275,17 @@ static int link_start(struct net_device
 	 */
 	if (ret == 0)
 		ret = t4vf_enable_vi(pi->adapter, pi->viid, true, true);
+
+	/* The Virtual Interfaces are connected to an internal switch on the
+	 * chip which allows VIs attached to the same port to talk to each
+	 * other even when the port link is down.  As a result, we generally
+	 * want to always report a VI's link as being "up", provided there are
+	 * no errors in enabling vi.
+	 */
+
+	if (ret == 0)
+		netif_carrier_on(dev);
+
 	return ret;
 }