On 2015-02-27 09:16 AM, Stefan Assmann wrote:

On 27.02.2015 15:02, nick wrote:

[...]

quoted

quoted

    i40e: Fix a bug where Rx would stop after some time
[...]

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index f7464e8..ff6d94d 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c

[...]

@@ -9169,6 +9178,13 @@ static int i40e_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	if (err)
 		dev_info(&pf->pdev->dev, "set phy mask fail, aq_err %d\n", err);

+	msleep(75);
+	err = i40e_aq_set_link_restart_an(&pf->hw, true, NULL);
+	if (err) {
+		dev_info(&pf->pdev->dev, "link restart failed, aq_err=%d\n",
+			 pf->hw.aq.asq_last_status);
+	}
+
 	/* The main driver is (mostly) up and happy. We need to set this state
 	 * before setting up the misc vector or we get a race and the vector
 	 * ends up disabled forever.

With this hunk removed the driver successfully unloaded/reloaded a
couple of hundred times. Would it be safe to just remove this hunk?
I haven't seen any negative effects by removing this yet.

  Stefan

Stefan,
I wouldn't remove them yet as this does look like a valid idea to check to see if the link is 
restarting successfully. On the other hand can you try removing the msleep line as this one is
most likely causing the issue due to sleeping for some long in a probe function is generally a
bad idea.
Thanks,
Nick

Thanks Nick for the quick reply. I tested removing the msleep but that
didn't make a difference. You actually need to remove the complete hunk
to get a stable driver reload.

  Stefan

Stefan,
Basically there are a few things that could be going wrong
1. You are getting a error return for the function,i40e_aq_set_link_restart_an
2. You are trying to re able the device again when not needed
3. You are sending a NULL value to a field for command arguments that takes a 0 and not NULL
to take no arguments
Nick 

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