[PATCH-RFC] drivers: net: ethernet: intel: e1000e: fix ethtool autoneg off for fiber

[PATCH-RFC] drivers: net: ethernet: intel: e1000e: fix ethtool autoneg off for fiber

[Daniel Walker]

From: Steve Shih <sshih@cisco.com>

This patch fixes the issues for disabling auto-negotiation and forcing
speed and duplex settings for the fiber media.

For fiber media, e1000_get_settings should return ETH_TP_MDI_INVALID for
eth_tp_mdix_ctrl instead of ETH_TP_MDI_AUTO so subsequent e1000_set_settings
call would not fail with -EOPNOTSUPP.

e1000_set_spd_dplx should not automatically turn autoneg back on for forced
1000 Mbps full duplex settings.

Cc: danielwa@fifo99.com
Cc: xe-kernel@external.cisco.com
Signed-off-by: Steve Shih <sshih@cisco.com>
---
 drivers/net/ethernet/intel/e1000e/ethtool.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/e1000e/ethtool.c b/drivers/net/ethernet/intel/e1000e/ethtool.c
index 6cab1f3..cd03dcd 100644
--- a/drivers/net/ethernet/intel/e1000e/ethtool.c
+++ b/drivers/net/ethernet/intel/e1000e/ethtool.c
@@ -201,6 +201,9 @@ static int e1000_get_settings(struct net_device *netdev,
 	else
 		ecmd->eth_tp_mdix_ctrl = hw->phy.mdix;
 
+	if (hw->phy.media_type != e1000_media_type_copper)
+		ecmd->eth_tp_mdix_ctrl = ETH_TP_MDI_INVALID;
+
 	return 0;
 }
 
@@ -236,8 +239,7 @@ static int e1000_set_spd_dplx(struct e1000_adapter *adapter, u32 spd, u8 dplx)
 		mac->forced_speed_duplex = ADVERTISE_100_FULL;
 		break;
 	case SPEED_1000 + DUPLEX_FULL:
-		mac->autoneg = 1;
-		adapter->hw.phy.autoneg_advertised = ADVERTISE_1000_FULL;
+		mac->forced_speed_duplex = ADVERTISE_1000_FULL;
 		break;
 	case SPEED_1000 + DUPLEX_HALF:	/* not supported */
 	default:
-- 
2.5.0

[Intel-wired-lan] [PATCH-RFC] drivers: net: ethernet: intel: e1000e: fix ethtool autoneg off for fiber

[Daniel Walker]

From: Steve Shih <sshih@cisco.com>

This patch fixes the issues for disabling auto-negotiation and forcing
speed and duplex settings for the fiber media.

For fiber media, e1000_get_settings should return ETH_TP_MDI_INVALID for
eth_tp_mdix_ctrl instead of ETH_TP_MDI_AUTO so subsequent e1000_set_settings
call would not fail with -EOPNOTSUPP.

e1000_set_spd_dplx should not automatically turn autoneg back on for forced
1000 Mbps full duplex settings.

Cc: danielwa at fifo99.com
Cc: xe-kernel at external.cisco.com
Signed-off-by: Steve Shih <sshih@cisco.com>
---
 drivers/net/ethernet/intel/e1000e/ethtool.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/e1000e/ethtool.c b/drivers/net/ethernet/intel/e1000e/ethtool.c
index 6cab1f3..cd03dcd 100644
--- a/drivers/net/ethernet/intel/e1000e/ethtool.c
+++ b/drivers/net/ethernet/intel/e1000e/ethtool.c
@@ -201,6 +201,9 @@ static int e1000_get_settings(struct net_device *netdev,
 	else
 		ecmd->eth_tp_mdix_ctrl = hw->phy.mdix;
 
+	if (hw->phy.media_type != e1000_media_type_copper)
+		ecmd->eth_tp_mdix_ctrl = ETH_TP_MDI_INVALID;
+
 	return 0;
 }
 
@@ -236,8 +239,7 @@ static int e1000_set_spd_dplx(struct e1000_adapter *adapter, u32 spd, u8 dplx)
 		mac->forced_speed_duplex = ADVERTISE_100_FULL;
 		break;
 	case SPEED_1000 + DUPLEX_FULL:
-		mac->autoneg = 1;
-		adapter->hw.phy.autoneg_advertised = ADVERTISE_1000_FULL;
+		mac->forced_speed_duplex = ADVERTISE_1000_FULL;
 		break;
 	case SPEED_1000 + DUPLEX_HALF:	/* not supported */
 	default:
-- 
2.5.0

Re: [PATCH-RFC] drivers: net: ethernet: intel: e1000e: fix ethtool autoneg off for fiber

[Daniel Walker]

So Intel maintainers (Jeff, Jesse, Shannon, Carolyn, Don, Bruce, and John)

I'm assuming no comments means this patch is acceptable , and I will 
resubmit it without the RFC. Is that acceptable ?


On 03/25/2016 02:58 PM, Daniel Walker wrote:
> From: Steve Shih <sshih@cisco.com>
>
> This patch fixes the issues for disabling auto-negotiation and forcing
> speed and duplex settings for the fiber media.
>
> For fiber media, e1000_get_settings should return ETH_TP_MDI_INVALID for
> eth_tp_mdix_ctrl instead of ETH_TP_MDI_AUTO so subsequent e1000_set_settings
> call would not fail with -EOPNOTSUPP.
>
> e1000_set_spd_dplx should not automatically turn autoneg back on for forced
> 1000 Mbps full duplex settings.
>
> Cc: danielwa@fifo99.com
> Cc: xe-kernel@external.cisco.com
> Signed-off-by: Steve Shih <sshih@cisco.com>
> ---
>   drivers/net/ethernet/intel/e1000e/ethtool.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/e1000e/ethtool.c b/drivers/net/ethernet/intel/e1000e/ethtool.c
> index 6cab1f3..cd03dcd 100644
> --- a/drivers/net/ethernet/intel/e1000e/ethtool.c
> +++ b/drivers/net/ethernet/intel/e1000e/ethtool.c
> @@ -201,6 +201,9 @@ static int e1000_get_settings(struct net_device *netdev,
>   	else
>   		ecmd->eth_tp_mdix_ctrl = hw->phy.mdix;
>   
> +	if (hw->phy.media_type != e1000_media_type_copper)
> +		ecmd->eth_tp_mdix_ctrl = ETH_TP_MDI_INVALID;
> +
>   	return 0;
>   }
>   
> @@ -236,8 +239,7 @@ static int e1000_set_spd_dplx(struct e1000_adapter *adapter, u32 spd, u8 dplx)
>   		mac->forced_speed_duplex = ADVERTISE_100_FULL;
>   		break;
>   	case SPEED_1000 + DUPLEX_FULL:
> -		mac->autoneg = 1;
> -		adapter->hw.phy.autoneg_advertised = ADVERTISE_1000_FULL;
> +		mac->forced_speed_duplex = ADVERTISE_1000_FULL;
>   		break;
>   	case SPEED_1000 + DUPLEX_HALF:	/* not supported */
>   	default:

[Intel-wired-lan] [PATCH-RFC] drivers: net: ethernet: intel: e1000e: fix ethtool autoneg off for fiber

[Daniel Walker]

So Intel maintainers (Jeff, Jesse, Shannon, Carolyn, Don, Bruce, and John)

I'm assuming no comments means this patch is acceptable , and I will 
resubmit it without the RFC. Is that acceptable ?


On 03/25/2016 02:58 PM, Daniel Walker wrote:
> From: Steve Shih <sshih@cisco.com>
>
> This patch fixes the issues for disabling auto-negotiation and forcing
> speed and duplex settings for the fiber media.
>
> For fiber media, e1000_get_settings should return ETH_TP_MDI_INVALID for
> eth_tp_mdix_ctrl instead of ETH_TP_MDI_AUTO so subsequent e1000_set_settings
> call would not fail with -EOPNOTSUPP.
>
> e1000_set_spd_dplx should not automatically turn autoneg back on for forced
> 1000 Mbps full duplex settings.
>
> Cc: danielwa at fifo99.com
> Cc: xe-kernel at external.cisco.com
> Signed-off-by: Steve Shih <sshih@cisco.com>
> ---
>   drivers/net/ethernet/intel/e1000e/ethtool.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/e1000e/ethtool.c b/drivers/net/ethernet/intel/e1000e/ethtool.c
> index 6cab1f3..cd03dcd 100644
> --- a/drivers/net/ethernet/intel/e1000e/ethtool.c
> +++ b/drivers/net/ethernet/intel/e1000e/ethtool.c
> @@ -201,6 +201,9 @@ static int e1000_get_settings(struct net_device *netdev,
>   	else
>   		ecmd->eth_tp_mdix_ctrl = hw->phy.mdix;
>   
> +	if (hw->phy.media_type != e1000_media_type_copper)
> +		ecmd->eth_tp_mdix_ctrl = ETH_TP_MDI_INVALID;
> +
>   	return 0;
>   }
>   
> @@ -236,8 +239,7 @@ static int e1000_set_spd_dplx(struct e1000_adapter *adapter, u32 spd, u8 dplx)
>   		mac->forced_speed_duplex = ADVERTISE_100_FULL;
>   		break;
>   	case SPEED_1000 + DUPLEX_FULL:
> -		mac->autoneg = 1;
> -		adapter->hw.phy.autoneg_advertised = ADVERTISE_1000_FULL;
> +		mac->forced_speed_duplex = ADVERTISE_1000_FULL;
>   		break;
>   	case SPEED_1000 + DUPLEX_HALF:	/* not supported */
>   	default:

Re: [PATCH-RFC] drivers: net: ethernet: intel: e1000e: fix ethtool autoneg off for fiber

[Jeff Kirsher]

[-- Attachment #1: Type: text/plain, Size: 437 bytes --]

On Wed, 2016-03-30 at 12:34 -0700, Daniel Walker wrote:
> 
> So Intel maintainers (Jeff, Jesse, Shannon, Carolyn, Don, Bruce, and
> John)
> 
> I'm assuming no comments means this patch is acceptable , and I will 
> resubmit it without the RFC. Is that acceptable ?

I personally do not see an issue with the patch, go ahead and submit it
as a non-RFC and I will make sure that the e1000e maintainer (Dima
Ruinskly) reviews it.

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[Intel-wired-lan] [PATCH-RFC] drivers: net: ethernet: intel: e1000e: fix ethtool autoneg off for fiber

[Jeff Kirsher]

On Wed, 2016-03-30 at 12:34 -0700, Daniel Walker wrote:
> 
> So Intel maintainers (Jeff, Jesse, Shannon, Carolyn, Don, Bruce, and
> John)
> 
> I'm assuming no comments means this patch is acceptable , and I will?
> resubmit it without the RFC. Is that acceptable ?

I personally do not see an issue with the patch, go ahead and submit it
as a non-RFC and I will make sure that the e1000e maintainer (Dima
Ruinskly) reviews it.
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RE: [Intel-wired-lan] [PATCH-RFC] drivers: net: ethernet: intel: e1000e: fix ethtool autoneg off for fiber

[Ruinskiy, Dima]

I have a couple of comments (sorry for not getting to it a bit sooner).

> For fiber media, e1000_get_settings should return ETH_TP_MDI_INVALID for
> eth_tp_mdix_ctrl instead of ETH_TP_MDI_AUTO so subsequent e1000_set_settings
> call would not fail with -EOPNOTSUPP.

Should this be specific to fiber? Because the code just checks media != copper. There is at least other media type (e1000_media_type_internal_serdes), which will be affected by this change as well. What is the proper behavior in this case?

> e1000_set_spd_dplx should not automatically turn autoneg back on for forced
> 1000 Mbps full duplex settings.

I seem to remember that this code is there because the copper-based NICs only support 1000Mbps in auto-negotiation mode, not forced (this is according to the IEEE spec, as far as I know). I believe this code is there to ensure that a user can force the speed to 1000 via the API, and still have the link resolve correctly via auto-negotiation. I am concerned that changing this code will break clients that rely on it. Maybe it is best to also limit it to fiber devices only?

Thanks,
Dima (Intel e1000e maintainer).

-----Original Message-----
From: Intel-wired-lan [mailto:intel-wired-lan-bounces@lists.osuosl.org] On Behalf Of Daniel Walker
Sent: Wednesday, 30 March, 2016 22:35
To: Kirsher, Jeffrey T; Brandeburg, Jesse; Nelson, Shannon; Wyborny, Carolyn; Skidmore, Donald C; Allan, Bruce W; Ronciak, John; Williams, Mitch A
Cc: netdev@vger.kernel.org; xe-kernel@external.cisco.com; danielwa@fifo99.com; linux-kernel@vger.kernel.org; Steve Shih; intel-wired-lan@lists.osuosl.org
Subject: Re: [Intel-wired-lan] [PATCH-RFC] drivers: net: ethernet: intel: e1000e: fix ethtool autoneg off for fiber


So Intel maintainers (Jeff, Jesse, Shannon, Carolyn, Don, Bruce, and John)

I'm assuming no comments means this patch is acceptable , and I will resubmit it without the RFC. Is that acceptable ?


On 03/25/2016 02:58 PM, Daniel Walker wrote:
> From: Steve Shih <sshih@cisco.com>
>
> This patch fixes the issues for disabling auto-negotiation and forcing
> speed and duplex settings for the fiber media.
>
> For fiber media, e1000_get_settings should return ETH_TP_MDI_INVALID for
> eth_tp_mdix_ctrl instead of ETH_TP_MDI_AUTO so subsequent e1000_set_settings
> call would not fail with -EOPNOTSUPP.
>
> e1000_set_spd_dplx should not automatically turn autoneg back on for forced
> 1000 Mbps full duplex settings.
>
> Cc: danielwa@fifo99.com
> Cc: xe-kernel@external.cisco.com
> Signed-off-by: Steve Shih <sshih@cisco.com>
> ---
>   drivers/net/ethernet/intel/e1000e/ethtool.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/e1000e/ethtool.c b/drivers/net/ethernet/intel/e1000e/ethtool.c
> index 6cab1f3..cd03dcd 100644
> --- a/drivers/net/ethernet/intel/e1000e/ethtool.c
> +++ b/drivers/net/ethernet/intel/e1000e/ethtool.c
> @@ -201,6 +201,9 @@ static int e1000_get_settings(struct net_device *netdev,
>   	else
>   		ecmd->eth_tp_mdix_ctrl = hw->phy.mdix;
>   
> +	if (hw->phy.media_type != e1000_media_type_copper)
> +		ecmd->eth_tp_mdix_ctrl = ETH_TP_MDI_INVALID;
> +
>   	return 0;
>   }
>   
> @@ -236,8 +239,7 @@ static int e1000_set_spd_dplx(struct e1000_adapter *adapter, u32 spd, u8 dplx)
>   		mac->forced_speed_duplex = ADVERTISE_100_FULL;
>   		break;
>   	case SPEED_1000 + DUPLEX_FULL:
> -		mac->autoneg = 1;
> -		adapter->hw.phy.autoneg_advertised = ADVERTISE_1000_FULL;
> +		mac->forced_speed_duplex = ADVERTISE_1000_FULL;
>   		break;
>   	case SPEED_1000 + DUPLEX_HALF:	/* not supported */
>   	default:

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---------------------------------------------------------------------
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This e-mail and any attachments may contain confidential material for
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recipient, please contact the sender and delete all copies.

[Intel-wired-lan] [PATCH-RFC] drivers: net: ethernet: intel: e1000e: fix ethtool autoneg off for fiber

[Ruinskiy, Dima]

I have a couple of comments (sorry for not getting to it a bit sooner).

> For fiber media, e1000_get_settings should return ETH_TP_MDI_INVALID for
> eth_tp_mdix_ctrl instead of ETH_TP_MDI_AUTO so subsequent e1000_set_settings
> call would not fail with -EOPNOTSUPP.

Should this be specific to fiber? Because the code just checks media != copper. There is at least other media type (e1000_media_type_internal_serdes), which will be affected by this change as well. What is the proper behavior in this case?

> e1000_set_spd_dplx should not automatically turn autoneg back on for forced
> 1000 Mbps full duplex settings.

I seem to remember that this code is there because the copper-based NICs only support 1000Mbps in auto-negotiation mode, not forced (this is according to the IEEE spec, as far as I know). I believe this code is there to ensure that a user can force the speed to 1000 via the API, and still have the link resolve correctly via auto-negotiation. I am concerned that changing this code will break clients that rely on it. Maybe it is best to also limit it to fiber devices only?

Thanks,
Dima (Intel e1000e maintainer).

-----Original Message-----
From: Intel-wired-lan [mailto:intel-wired-lan-bounces at lists.osuosl.org] On Behalf Of Daniel Walker
Sent: Wednesday, 30 March, 2016 22:35
To: Kirsher, Jeffrey T; Brandeburg, Jesse; Nelson, Shannon; Wyborny, Carolyn; Skidmore, Donald C; Allan, Bruce W; Ronciak, John; Williams, Mitch A
Cc: netdev at vger.kernel.org; xe-kernel at external.cisco.com; danielwa at fifo99.com; linux-kernel at vger.kernel.org; Steve Shih; intel-wired-lan at lists.osuosl.org
Subject: Re: [Intel-wired-lan] [PATCH-RFC] drivers: net: ethernet: intel: e1000e: fix ethtool autoneg off for fiber


So Intel maintainers (Jeff, Jesse, Shannon, Carolyn, Don, Bruce, and John)

I'm assuming no comments means this patch is acceptable , and I will resubmit it without the RFC. Is that acceptable ?


On 03/25/2016 02:58 PM, Daniel Walker wrote:
> From: Steve Shih <sshih@cisco.com>
>
> This patch fixes the issues for disabling auto-negotiation and forcing
> speed and duplex settings for the fiber media.
>
> For fiber media, e1000_get_settings should return ETH_TP_MDI_INVALID for
> eth_tp_mdix_ctrl instead of ETH_TP_MDI_AUTO so subsequent e1000_set_settings
> call would not fail with -EOPNOTSUPP.
>
> e1000_set_spd_dplx should not automatically turn autoneg back on for forced
> 1000 Mbps full duplex settings.
>
> Cc: danielwa at fifo99.com
> Cc: xe-kernel at external.cisco.com
> Signed-off-by: Steve Shih <sshih@cisco.com>
> ---
>   drivers/net/ethernet/intel/e1000e/ethtool.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/e1000e/ethtool.c b/drivers/net/ethernet/intel/e1000e/ethtool.c
> index 6cab1f3..cd03dcd 100644
> --- a/drivers/net/ethernet/intel/e1000e/ethtool.c
> +++ b/drivers/net/ethernet/intel/e1000e/ethtool.c
> @@ -201,6 +201,9 @@ static int e1000_get_settings(struct net_device *netdev,
>   	else
>   		ecmd->eth_tp_mdix_ctrl = hw->phy.mdix;
>   
> +	if (hw->phy.media_type != e1000_media_type_copper)
> +		ecmd->eth_tp_mdix_ctrl = ETH_TP_MDI_INVALID;
> +
>   	return 0;
>   }
>   
> @@ -236,8 +239,7 @@ static int e1000_set_spd_dplx(struct e1000_adapter *adapter, u32 spd, u8 dplx)
>   		mac->forced_speed_duplex = ADVERTISE_100_FULL;
>   		break;
>   	case SPEED_1000 + DUPLEX_FULL:
> -		mac->autoneg = 1;
> -		adapter->hw.phy.autoneg_advertised = ADVERTISE_1000_FULL;
> +		mac->forced_speed_duplex = ADVERTISE_1000_FULL;
>   		break;
>   	case SPEED_1000 + DUPLEX_HALF:	/* not supported */
>   	default:

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recipient, please contact the sender and delete all copies.

Re: [Intel-wired-lan] [PATCH-RFC] drivers: net: ethernet: intel: e1000e: fix ethtool autoneg off for fiber

[Daniel Walker]

On 04/03/2016 07:23 AM, Ruinskiy, Dima wrote:
> I have a couple of comments (sorry for not getting to it a bit sooner).
>
>> For fiber media, e1000_get_settings should return ETH_TP_MDI_INVALID for
>> eth_tp_mdix_ctrl instead of ETH_TP_MDI_AUTO so subsequent e1000_set_settings
>> call would not fail with -EOPNOTSUPP.
> Should this be specific to fiber? Because the code just checks media != copper. There is at least other media type (e1000_media_type_internal_serdes), which will be affected by this change as well. What is the proper behavior in this case?
Steve is shy, so here are his comments,

<Steve>
Regarding the 1st comment. The issue affects all non-copper media. In 
fact, we are using e1000_media_type_internal_serdes and are affected due 
to the following check in e1000_set_settings:

/* MDI setting is only allowed when autoneg enabled because
* some hardware doesn't allow MDI setting when speed or
* duplex is forced.
*/
if (ecmd->eth_tp_mdix_ctrl) {
if (hw->phy.media_type != e1000_media_type_copper)
return -EOPNOTSUPP;

if ((ecmd->eth_tp_mdix_ctrl != ETH_TP_MDI_AUTO) &&
(ecmd->autoneg != AUTONEG_ENABLE)) {
e_err("forcing MDI/MDI-X state is not supported when link speed and/or 
duplex are forced\n");
return -EINVAL;
}
}

</Steve>

>> e1000_set_spd_dplx should not automatically turn autoneg back on for forced
>> 1000 Mbps full duplex settings.
> I seem to remember that this code is there because the copper-based NICs only support 1000Mbps in auto-negotiation mode, not forced (this is according to the IEEE spec, as far as I know). I believe this code is there to ensure that a user can force the speed to 1000 via the API, and still have the link resolve correctly via auto-negotiation. I am concerned that changing this code will break clients that rely on it. Maybe it is best to also limit it to fiber devices only?
>

<Steve>
Regarding the 2nd comment. Yes, will limit to non-copper media.
</Steve>

He supplied me with a second patch which I can send.. Can we remove the 
RFC this time ?

Daniel

[Intel-wired-lan] [PATCH-RFC] drivers: net: ethernet: intel: e1000e: fix ethtool autoneg off for fiber

[Daniel Walker]

On 04/03/2016 07:23 AM, Ruinskiy, Dima wrote:
> I have a couple of comments (sorry for not getting to it a bit sooner).
>
>> For fiber media, e1000_get_settings should return ETH_TP_MDI_INVALID for
>> eth_tp_mdix_ctrl instead of ETH_TP_MDI_AUTO so subsequent e1000_set_settings
>> call would not fail with -EOPNOTSUPP.
> Should this be specific to fiber? Because the code just checks media != copper. There is at least other media type (e1000_media_type_internal_serdes), which will be affected by this change as well. What is the proper behavior in this case?
Steve is shy, so here are his comments,

<Steve>
Regarding the 1st comment. The issue affects all non-copper media. In 
fact, we are using e1000_media_type_internal_serdes and are affected due 
to the following check in e1000_set_settings:

/* MDI setting is only allowed when autoneg enabled because
* some hardware doesn't allow MDI setting when speed or
* duplex is forced.
*/
if (ecmd->eth_tp_mdix_ctrl) {
if (hw->phy.media_type != e1000_media_type_copper)
return -EOPNOTSUPP;

if ((ecmd->eth_tp_mdix_ctrl != ETH_TP_MDI_AUTO) &&
(ecmd->autoneg != AUTONEG_ENABLE)) {
e_err("forcing MDI/MDI-X state is not supported when link speed and/or 
duplex are forced\n");
return -EINVAL;
}
}

</Steve>

>> e1000_set_spd_dplx should not automatically turn autoneg back on for forced
>> 1000 Mbps full duplex settings.
> I seem to remember that this code is there because the copper-based NICs only support 1000Mbps in auto-negotiation mode, not forced (this is according to the IEEE spec, as far as I know). I believe this code is there to ensure that a user can force the speed to 1000 via the API, and still have the link resolve correctly via auto-negotiation. I am concerned that changing this code will break clients that rely on it. Maybe it is best to also limit it to fiber devices only?
>

<Steve>
Regarding the 2nd comment. Yes, will limit to non-copper media.
</Steve>

He supplied me with a second patch which I can send.. Can we remove the 
RFC this time ?

Daniel

RE: [Intel-wired-lan] [PATCH-RFC] drivers: net: ethernet: intel: e1000e: fix ethtool autoneg off for fiber

[Ruinskiy, Dima]

Sure, please send. It will be reviewed like any other patch. :)

-----Original Message-----
From: Daniel Walker [mailto:danielwa@cisco.com] 
Sent: Tuesday, April 05, 2016 02:04
To: Ruinskiy, Dima; Kirsher, Jeffrey T; Brandeburg, Jesse; Nelson, Shannon; Wyborny, Carolyn; Skidmore, Donald C; Allan, Bruce W; Ronciak, John; Williams, Mitch A
Cc: netdev@vger.kernel.org; xe-kernel@external.cisco.com; danielwa@fifo99.com; linux-kernel@vger.kernel.org; Steve Shih; intel-wired-lan@lists.osuosl.org
Subject: Re: [Intel-wired-lan] [PATCH-RFC] drivers: net: ethernet: intel: e1000e: fix ethtool autoneg off for fiber

On 04/03/2016 07:23 AM, Ruinskiy, Dima wrote:
> I have a couple of comments (sorry for not getting to it a bit sooner).
>
>> For fiber media, e1000_get_settings should return ETH_TP_MDI_INVALID for
>> eth_tp_mdix_ctrl instead of ETH_TP_MDI_AUTO so subsequent e1000_set_settings
>> call would not fail with -EOPNOTSUPP.
> Should this be specific to fiber? Because the code just checks media != copper. There is at least other media type (e1000_media_type_internal_serdes), which will be affected by this change as well. What is the proper behavior in this case?
Steve is shy, so here are his comments,

<Steve>
Regarding the 1st comment. The issue affects all non-copper media. In 
fact, we are using e1000_media_type_internal_serdes and are affected due 
to the following check in e1000_set_settings:

/* MDI setting is only allowed when autoneg enabled because
* some hardware doesn't allow MDI setting when speed or
* duplex is forced.
*/
if (ecmd->eth_tp_mdix_ctrl) {
if (hw->phy.media_type != e1000_media_type_copper)
return -EOPNOTSUPP;

if ((ecmd->eth_tp_mdix_ctrl != ETH_TP_MDI_AUTO) &&
(ecmd->autoneg != AUTONEG_ENABLE)) {
e_err("forcing MDI/MDI-X state is not supported when link speed and/or 
duplex are forced\n");
return -EINVAL;
}
}

</Steve>

>> e1000_set_spd_dplx should not automatically turn autoneg back on for forced
>> 1000 Mbps full duplex settings.
> I seem to remember that this code is there because the copper-based NICs only support 1000Mbps in auto-negotiation mode, not forced (this is according to the IEEE spec, as far as I know). I believe this code is there to ensure that a user can force the speed to 1000 via the API, and still have the link resolve correctly via auto-negotiation. I am concerned that changing this code will break clients that rely on it. Maybe it is best to also limit it to fiber devices only?
>

<Steve>
Regarding the 2nd comment. Yes, will limit to non-copper media.
</Steve>

He supplied me with a second patch which I can send.. Can we remove the 
RFC this time ?

Daniel
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[Intel-wired-lan] [PATCH-RFC] drivers: net: ethernet: intel: e1000e: fix ethtool autoneg off for fiber

[Ruinskiy, Dima]

Sure, please send. It will be reviewed like any other patch. :)

-----Original Message-----
From: Daniel Walker [mailto:danielwa at cisco.com] 
Sent: Tuesday, April 05, 2016 02:04
To: Ruinskiy, Dima; Kirsher, Jeffrey T; Brandeburg, Jesse; Nelson, Shannon; Wyborny, Carolyn; Skidmore, Donald C; Allan, Bruce W; Ronciak, John; Williams, Mitch A
Cc: netdev at vger.kernel.org; xe-kernel at external.cisco.com; danielwa at fifo99.com; linux-kernel at vger.kernel.org; Steve Shih; intel-wired-lan at lists.osuosl.org
Subject: Re: [Intel-wired-lan] [PATCH-RFC] drivers: net: ethernet: intel: e1000e: fix ethtool autoneg off for fiber

On 04/03/2016 07:23 AM, Ruinskiy, Dima wrote:
> I have a couple of comments (sorry for not getting to it a bit sooner).
>
>> For fiber media, e1000_get_settings should return ETH_TP_MDI_INVALID for
>> eth_tp_mdix_ctrl instead of ETH_TP_MDI_AUTO so subsequent e1000_set_settings
>> call would not fail with -EOPNOTSUPP.
> Should this be specific to fiber? Because the code just checks media != copper. There is at least other media type (e1000_media_type_internal_serdes), which will be affected by this change as well. What is the proper behavior in this case?
Steve is shy, so here are his comments,

<Steve>
Regarding the 1st comment. The issue affects all non-copper media. In 
fact, we are using e1000_media_type_internal_serdes and are affected due 
to the following check in e1000_set_settings:

/* MDI setting is only allowed when autoneg enabled because
* some hardware doesn't allow MDI setting when speed or
* duplex is forced.
*/
if (ecmd->eth_tp_mdix_ctrl) {
if (hw->phy.media_type != e1000_media_type_copper)
return -EOPNOTSUPP;

if ((ecmd->eth_tp_mdix_ctrl != ETH_TP_MDI_AUTO) &&
(ecmd->autoneg != AUTONEG_ENABLE)) {
e_err("forcing MDI/MDI-X state is not supported when link speed and/or 
duplex are forced\n");
return -EINVAL;
}
}

</Steve>

>> e1000_set_spd_dplx should not automatically turn autoneg back on for forced
>> 1000 Mbps full duplex settings.
> I seem to remember that this code is there because the copper-based NICs only support 1000Mbps in auto-negotiation mode, not forced (this is according to the IEEE spec, as far as I know). I believe this code is there to ensure that a user can force the speed to 1000 via the API, and still have the link resolve correctly via auto-negotiation. I am concerned that changing this code will break clients that rely on it. Maybe it is best to also limit it to fiber devices only?
>

<Steve>
Regarding the 2nd comment. Yes, will limit to non-copper media.
</Steve>

He supplied me with a second patch which I can send.. Can we remove the 
RFC this time ?

Daniel
---------------------------------------------------------------------
Intel Israel (74) Limited

This e-mail and any attachments may contain confidential material for
the sole use of the intended recipient(s). Any review or distribution
by others is strictly prohibited. If you are not the intended
recipient, please contact the sender and delete all copies.