netdev - [PATCH net 7/9] bnx2x: Fix statistics gathering on link change

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Date:	Thu, 25 Jun 2015 15:19:27 +0300
From:	Yuval Mintz <Yuval.Mintz@...gic.com>
To:	<davem@...emloft.net>, <netdev@...r.kernel.org>
CC:	<Ariel.Elior@...gic.com>, Yuval Mintz <Yuval.Mintz@...gic.com>
Subject: [PATCH net 7/9] bnx2x: Fix statistics gathering on link change

From: Ariel Elior <Ariel.Elior@...gic.com>

Since driver statistics flow access MACs and those might reset during
link re-configurations, when we're about to change link properties we
have to make sure that statistics are not operational.
Statisics would be re-enabled [i.e., gathering of statistics would
re-commence] once physical link is achieved again.

Since driver employs a link-flap avoidance scheme, there are scenarios
where driver will receive no indication that the new link is up, and
as a result the statistics would not be re-enabled.

Preventing LFA from working in such cases would guarantee that we'll
always receive such indications and thus will fix statistics gathering.

Signed-off-by: Ariel Elior <Ariel.Elior@...gic.com>
Signed-off-by: Yuval Mintz <Yuval.Mintz@...gic.com>
---
 drivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c
index 733b0fc..caf6b31 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c
@@ -658,6 +658,7 @@ static int bnx2x_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 	bp->link_params.multi_phy_config = new_multi_phy_config;
 	if (netif_running(dev)) {
 		bnx2x_stats_handle(bp, STATS_EVENT_STOP);
+		bnx2x_force_link_reset(bp);
 		bnx2x_link_set(bp);
 	}

@@ -1969,6 +1970,7 @@ static int bnx2x_set_pauseparam(struct net_device *dev,

 	if (netif_running(dev)) {
 		bnx2x_stats_handle(bp, STATS_EVENT_STOP);
+		bnx2x_force_link_reset(bp);
 		bnx2x_link_set(bp);
 	}

-- 
1.9.3

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