linux-kernel - [PATCH AUTOSEL 4.19 55/73] ice: Fix dead device link issue with flow control

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Date:   Wed, 14 Nov 2018 17:21:49 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Akeem G Abodunrin <akeem.g.abodunrin@...el.com>,
        Anirudh Venkataramanan <anirudh.venkataramanan@...el.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.19 55/73] ice: Fix dead device link issue with flow control

From: Akeem G Abodunrin <akeem.g.abodunrin@...el.com>

[ Upstream commit 0f5d4c21a50716f8bd4e220544b82dca7408d113 ]

Setting Rx or Tx pause parameter currently results in link loss on the
interface, requiring the platform/host to be cold power cycled. Fix it.

Signed-off-by: Akeem G Abodunrin <akeem.g.abodunrin@...el.com>
Signed-off-by: Anirudh Venkataramanan <anirudh.venkataramanan@...el.com>
Tested-by: Andrew Bowers <andrewx.bowers@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/intel/ice/ice_ethtool.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_ethtool.c b/drivers/net/ethernet/intel/ice/ice_ethtool.c
index c71a9b528d6d..0717d2e1ab67 100644
--- a/drivers/net/ethernet/intel/ice/ice_ethtool.c
+++ b/drivers/net/ethernet/intel/ice/ice_ethtool.c
@@ -786,10 +786,15 @@ ice_set_pauseparam(struct net_device *netdev, struct ethtool_pauseparam *pause)
 	}
 
 	if (!test_bit(__ICE_DOWN, pf->state)) {
-		/* Give it a little more time to try to come back */
+		/* Give it a little more time to try to come back. If still
+		 * down, restart autoneg link or reinitialize the interface.
+		 */
 		msleep(75);
 		if (!test_bit(__ICE_DOWN, pf->state))
 			return ice_nway_reset(netdev);
+
+		ice_down(vsi);
+		ice_up(vsi);
 	}
 
 	return err;
-- 
2.17.1