netdev - [net-next 18/20] fm10k: force link to remain down for at least a second on resume events

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Date:	Wed, 20 Jul 2016 15:23:56 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	davem@...emloft.net
Cc:	Jacob Keller <jacob.e.keller@...el.com>, netdev@...r.kernel.org,
	nhorman@...hat.com, sassmann@...hat.com, jogreene@...hat.com,
	guru.anbalagane@...cle.com,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next 18/20] fm10k: force link to remain down for at least a second on resume events

From: Jacob Keller <jacob.e.keller@...el.com>

When we resume from an AER recovery with many active VFs, the PF sees
many spurious link up and link down events. Prevent this by delaying
link down for at least one second after the resume event.

Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
Tested-by: Krishneil Singh <Krishneil.k.singh@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 drivers/net/ethernet/intel/fm10k/fm10k_pci.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_pci.c b/drivers/net/ethernet/intel/fm10k/fm10k_pci.c
index d4ccb2a..b8245c7 100644
--- a/drivers/net/ethernet/intel/fm10k/fm10k_pci.c
+++ b/drivers/net/ethernet/intel/fm10k/fm10k_pci.c
@@ -2158,6 +2158,10 @@ static int fm10k_handle_resume(struct fm10k_intfc *interface)
 	interface->host_ready = false;
 	fm10k_watchdog_host_not_ready(interface);
 
+	/* force link to stay down for a second to prevent link flutter */
+	interface->link_down_event = jiffies + (HZ);
+	set_bit(__FM10K_LINK_DOWN, &interface->state);
+
 	/* clear the service task disable bit to allow service task to start */
 	clear_bit(__FM10K_SERVICE_DISABLE, &interface->state);
 	fm10k_service_event_schedule(interface);
-- 
2.5.5