[PATCH net-next] igb: reset PHY after recovering from PHY power down

[PATCH net-next] igb: reset PHY after recovering from PHY power down

[Koki Sanagi]

According to 82576_Datasheet.pdf, PHY setting is lost after PHY power down.
So resetting PHY is needed when recovering from PHY power down to set a default
setting to PHY register.

Owing to this lack, NIC doesn't link up in some rare situation.
The situation I encountered is following.


1.Both ports connect to switch.
+---------+           +--------+
|         |-----------|        |
| 82576NS |           | switch |
|         |-----------|        |
+---------+           +--------+

2.Detach both cables from switch.
+---------+           +--------+
|         |-------    |        |
| 82576NS |           | switch |
|         |-------    |        |
+---------+           +--------+

3.Detach one cable from one port.
+---------+           +--------+
|         |-------    |        |
| 82576NS |           | switch |
|         |           |        |
+---------+           +--------+

4.Attach that cable to the other port.(It means connecting directly each port)
+---------+           +--------+
|         |-------+   |        |
| 82576NS |       |   | switch |
|         |-------+   |        |
+---------+           +--------+

As a result, NIC doesn't link up sometimes.

Signed-off-by: Koki Sanagi <sanagi.koki@jp.fujitsu.com>
---
 drivers/net/ethernet/intel/igb/igb_main.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index bd9b30e..4d4f065 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -2496,6 +2496,7 @@ static int igb_open(struct net_device *netdev)
 		goto err_setup_rx;
 
 	igb_power_up_link(adapter);
+	igb_reset_phy(hw);
 
 	/* before we allocate an interrupt, we must be ready to handle it.
 	 * Setting DEBUG_SHIRQ in the kernel makes it fire an interrupt

RE: [PATCH net-next] igb: reset PHY after recovering from PHY power down

[Wyborny, Carolyn]

>-----Original Message-----
>From: Koki Sanagi [mailto:sanagi.koki@jp.fujitsu.com]
>Sent: Wednesday, November 23, 2011 7:18 PM
>To: netdev@vger.kernel.org; Kirsher, Jeffrey T; Brandeburg, Jesse;
>Allan, Bruce W; Wyborny, Carolyn; Skidmore, Donald C; Rose, Gregory V;
>Waskiewicz Jr, Peter P; Duyck, Alexander H; Ronciak, John; e1000-
>devel@lists.sourceforge.net
>Cc: davem@davemloft.net
>Subject: [PATCH net-next] igb: reset PHY after recovering from PHY power
>down
>
>According to 82576_Datasheet.pdf, PHY setting is lost after PHY power
>down.
>So resetting PHY is needed when recovering from PHY power down to set a
>default
>setting to PHY register.
>
>Owing to this lack, NIC doesn't link up in some rare situation.
>The situation I encountered is following.
>
>
>1.Both ports connect to switch.
>+---------+           +--------+
>|         |-----------|        |
>| 82576NS |           | switch |
>|         |-----------|        |
>+---------+           +--------+
>
>2.Detach both cables from switch.
>+---------+           +--------+
>|         |-------    |        |
>| 82576NS |           | switch |
>|         |-------    |        |
>+---------+           +--------+
>
>3.Detach one cable from one port.
>+---------+           +--------+
>|         |-------    |        |
>| 82576NS |           | switch |
>|         |           |        |
>+---------+           +--------+
>
>4.Attach that cable to the other port.(It means connecting directly each
>port)
>+---------+           +--------+
>|         |-------+   |        |
>| 82576NS |       |   | switch |
>|         |-------+   |        |
>+---------+           +--------+
>
>As a result, NIC doesn't link up sometimes.
>
>Signed-off-by: Koki Sanagi <sanagi.koki@jp.fujitsu.com>
>---
> drivers/net/ethernet/intel/igb/igb_main.c |    1 +
> 1 files changed, 1 insertions(+), 0 deletions(-)
>
>diff --git a/drivers/net/ethernet/intel/igb/igb_main.c
>b/drivers/net/ethernet/intel/igb/igb_main.c
>index bd9b30e..4d4f065 100644
>--- a/drivers/net/ethernet/intel/igb/igb_main.c
>+++ b/drivers/net/ethernet/intel/igb/igb_main.c
>@@ -2496,6 +2496,7 @@ static int igb_open(struct net_device *netdev)
> 		goto err_setup_rx;
>
> 	igb_power_up_link(adapter);
>+	igb_reset_phy(hw);
>
> 	/* before we allocate an interrupt, we must be ready to handle it.
> 	 * Setting DEBUG_SHIRQ in the kernel makes it fire an interrupt

Hello,

This seems reasonable, however it would only cover cases where igb_open is being called.  It would be better to integrate the phy_reset call into igb_power_up_link, so that's the default. I can provide an alternate by end of the week.

Thanks,

Carolyn

Carolyn Wyborny
Linux Development
LAN Access Division
Intel Corporation

Re: [PATCH net-next] igb: reset PHY after recovering from PHY power down

[Koki Sanagi]

(2011/11/29 2:57), Wyborny, Carolyn wrote:
> 
> 
>> -----Original Message-----
>> From: Koki Sanagi [mailto:sanagi.koki@jp.fujitsu.com]
>> Sent: Wednesday, November 23, 2011 7:18 PM
>> To: netdev@vger.kernel.org; Kirsher, Jeffrey T; Brandeburg, Jesse;
>> Allan, Bruce W; Wyborny, Carolyn; Skidmore, Donald C; Rose, Gregory V;
>> Waskiewicz Jr, Peter P; Duyck, Alexander H; Ronciak, John; e1000-
>> devel@lists.sourceforge.net
>> Cc: davem@davemloft.net
>> Subject: [PATCH net-next] igb: reset PHY after recovering from PHY power
>> down
>>
>> According to 82576_Datasheet.pdf, PHY setting is lost after PHY power
>> down.
>> So resetting PHY is needed when recovering from PHY power down to set a
>> default
>> setting to PHY register.
>>
>> Owing to this lack, NIC doesn't link up in some rare situation.
>> The situation I encountered is following.
>>
>>
>> 1.Both ports connect to switch.
>> +---------+           +--------+
>> |         |-----------|        |
>> | 82576NS |           | switch |
>> |         |-----------|        |
>> +---------+           +--------+
>>
>> 2.Detach both cables from switch.
>> +---------+           +--------+
>> |         |-------    |        |
>> | 82576NS |           | switch |
>> |         |-------    |        |
>> +---------+           +--------+
>>
>> 3.Detach one cable from one port.
>> +---------+           +--------+
>> |         |-------    |        |
>> | 82576NS |           | switch |
>> |         |           |        |
>> +---------+           +--------+
>>
>> 4.Attach that cable to the other port.(It means connecting directly each
>> port)
>> +---------+           +--------+
>> |         |-------+   |        |
>> | 82576NS |       |   | switch |
>> |         |-------+   |        |
>> +---------+           +--------+
>>
>> As a result, NIC doesn't link up sometimes.
>>
>> Signed-off-by: Koki Sanagi <sanagi.koki@jp.fujitsu.com>
>> ---
>> drivers/net/ethernet/intel/igb/igb_main.c |    1 +
>> 1 files changed, 1 insertions(+), 0 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/intel/igb/igb_main.c
>> b/drivers/net/ethernet/intel/igb/igb_main.c
>> index bd9b30e..4d4f065 100644
>> --- a/drivers/net/ethernet/intel/igb/igb_main.c
>> +++ b/drivers/net/ethernet/intel/igb/igb_main.c
>> @@ -2496,6 +2496,7 @@ static int igb_open(struct net_device *netdev)
>> 		goto err_setup_rx;
>>
>> 	igb_power_up_link(adapter);
>> +	igb_reset_phy(hw);
>>
>> 	/* before we allocate an interrupt, we must be ready to handle it.
>> 	 * Setting DEBUG_SHIRQ in the kernel makes it fire an interrupt
> 
> Hello,
> 
> This seems reasonable, however it would only cover cases where igb_open is being called.  It would be better to integrate the phy_reset call into igb_power_up_link, so that's the default. I can provide an alternate by end of the week.
> 

When will the alternate be provided ?

In addition, more general problem which this lack of reset causes is found.

Two machine have 82576NS and each NIC is connected directly each other.

+--------+                           +--------+
|        |                           |        |
|        +-------+           +-------+        |
|        |       |           |       |        |
|machineA|82576NS|-----------|82576NS|machineB|
|        |       |           |       |        |
|        +-------+           +-------+        |
|        |                           |        |
+--------+                           +--------+

When attaching and detaching a cable repeatedly on one side port,
that side port becomes not link up.

This is also fixed by adding resetting phy.

Thanks,
Koki Sanagi

> Thanks,
> 
> Carolyn
> 
> Carolyn Wyborny
> Linux Development
> LAN Access Division
> Intel Corporation
> 
> 
> 
> 



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RE: [PATCH net-next] igb: reset PHY after recovering from PHY power down

[Wyborny, Carolyn]

>-----Original Message-----
>From: Koki Sanagi [mailto:sanagi.koki@jp.fujitsu.com]
>Sent: Wednesday, November 23, 2011 7:18 PM
>To: netdev@vger.kernel.org; Kirsher, Jeffrey T; Brandeburg, Jesse;
>Allan, Bruce W; Wyborny, Carolyn; Skidmore, Donald C; Rose, Gregory V;
>Waskiewicz Jr, Peter P; Duyck, Alexander H; Ronciak, John; e1000-
>devel@lists.sourceforge.net
>Cc: davem@davemloft.net
>Subject: [PATCH net-next] igb: reset PHY after recovering from PHY power
>down
>
>According to 82576_Datasheet.pdf, PHY setting is lost after PHY power
>down.
>So resetting PHY is needed when recovering from PHY power down to set a
>default
>setting to PHY register.
>
>Owing to this lack, NIC doesn't link up in some rare situation.
>The situation I encountered is following.
>
>
>1.Both ports connect to switch.
>+---------+           +--------+
>|         |-----------|        |
>| 82576NS |           | switch |
>|         |-----------|        |
>+---------+           +--------+
>
>2.Detach both cables from switch.
>+---------+           +--------+
>|         |-------    |        |
>| 82576NS |           | switch |
>|         |-------    |        |
>+---------+           +--------+
>
>3.Detach one cable from one port.
>+---------+           +--------+
>|         |-------    |        |
>| 82576NS |           | switch |
>|         |           |        |
>+---------+           +--------+
>
>4.Attach that cable to the other port.(It means connecting directly each
>port)
>+---------+           +--------+
>|         |-------+   |        |
>| 82576NS |       |   | switch |
>|         |-------+   |        |
>+---------+           +--------+
>
>As a result, NIC doesn't link up sometimes.
>
>Signed-off-by: Koki Sanagi <sanagi.koki@jp.fujitsu.com>
>---
> drivers/net/ethernet/intel/igb/igb_main.c |    1 +
> 1 files changed, 1 insertions(+), 0 deletions(-)
>
>diff --git a/drivers/net/ethernet/intel/igb/igb_main.c
>b/drivers/net/ethernet/intel/igb/igb_main.c
>index bd9b30e..4d4f065 100644
>--- a/drivers/net/ethernet/intel/igb/igb_main.c
>+++ b/drivers/net/ethernet/intel/igb/igb_main.c
>@@ -2496,6 +2496,7 @@ static int igb_open(struct net_device *netdev)
> 		goto err_setup_rx;
>
> 	igb_power_up_link(adapter);
>+	igb_reset_phy(hw);
>
> 	/* before we allocate an interrupt, we must be ready to handle it.
> 	 * Setting DEBUG_SHIRQ in the kernel makes it fire an interrupt

I apologize for the delay in getting back to you.  After a review, I see that the needed change is simpler than I thought at first.  Can you resubmit with the igb_reset_phy call being added to the end of the igb_power_up_link function instead of after it in igb_open.  That way, whenever igb_power_link is called in the code, it will also execute the igb_reset_phy function which is the complete solution.  Thank you for your work on the igb driver.

Carolyn

Carolyn Wyborny
Linux Development
LAN Access Division
Intel Corporation

Re: [PATCH net-next] igb: reset PHY after recovering from PHY power down

[Koki Sanagi]

(2011/12/17 0:53), Wyborny, Carolyn wrote:
> 
> 
>> -----Original Message-----
>> From: Koki Sanagi [mailto:sanagi.koki@jp.fujitsu.com]
>> Sent: Wednesday, November 23, 2011 7:18 PM
>> To: netdev@vger.kernel.org; Kirsher, Jeffrey T; Brandeburg, Jesse;
>> Allan, Bruce W; Wyborny, Carolyn; Skidmore, Donald C; Rose, Gregory V;
>> Waskiewicz Jr, Peter P; Duyck, Alexander H; Ronciak, John; e1000-
>> devel@lists.sourceforge.net
>> Cc: davem@davemloft.net
>> Subject: [PATCH net-next] igb: reset PHY after recovering from PHY power
>> down
>>
>> According to 82576_Datasheet.pdf, PHY setting is lost after PHY power
>> down.
>> So resetting PHY is needed when recovering from PHY power down to set a
>> default
>> setting to PHY register.
>>
>> Owing to this lack, NIC doesn't link up in some rare situation.
>> The situation I encountered is following.
>>
>>
>> 1.Both ports connect to switch.
>> +---------+           +--------+
>> |         |-----------|        |
>> | 82576NS |           | switch |
>> |         |-----------|        |
>> +---------+           +--------+
>>
>> 2.Detach both cables from switch.
>> +---------+           +--------+
>> |         |-------    |        |
>> | 82576NS |           | switch |
>> |         |-------    |        |
>> +---------+           +--------+
>>
>> 3.Detach one cable from one port.
>> +---------+           +--------+
>> |         |-------    |        |
>> | 82576NS |           | switch |
>> |         |           |        |
>> +---------+           +--------+
>>
>> 4.Attach that cable to the other port.(It means connecting directly each
>> port)
>> +---------+           +--------+
>> |         |-------+   |        |
>> | 82576NS |       |   | switch |
>> |         |-------+   |        |
>> +---------+           +--------+
>>
>> As a result, NIC doesn't link up sometimes.
>>
>> Signed-off-by: Koki Sanagi <sanagi.koki@jp.fujitsu.com>
>> ---
>> drivers/net/ethernet/intel/igb/igb_main.c |    1 +
>> 1 files changed, 1 insertions(+), 0 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/intel/igb/igb_main.c
>> b/drivers/net/ethernet/intel/igb/igb_main.c
>> index bd9b30e..4d4f065 100644
>> --- a/drivers/net/ethernet/intel/igb/igb_main.c
>> +++ b/drivers/net/ethernet/intel/igb/igb_main.c
>> @@ -2496,6 +2496,7 @@ static int igb_open(struct net_device *netdev)
>> 		goto err_setup_rx;
>>
>> 	igb_power_up_link(adapter);
>> +	igb_reset_phy(hw);
>>
>> 	/* before we allocate an interrupt, we must be ready to handle it.
>> 	 * Setting DEBUG_SHIRQ in the kernel makes it fire an interrupt
> 
> I apologize for the delay in getting back to you.  After a review, I see 
> that the needed change is simpler than I thought at first.  Can you resubmit
> with the igb_reset_phy call being added to the end of the igb_power_up_link 
> function instead of after it in igb_open.  That way, whenever igb_power_link
> is called in the code, it will also execute the igb_reset_phy function which 
> is the complete solution.  Thank you for your work on the igb driver.
> 

Thank you for your reply.

O.K. I'll resubmit it soon.

Thanks!
Koki Sanagi


> Carolyn
> 
> Carolyn Wyborny
> Linux Development
> LAN Access Division
> Intel Corporation
> 
> 
> 
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