Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1627318 > unrolled thread

[PATCH v1] net: phy: fix auto-negotiation stall due to unavailable interrupt

Back to article view | Back to linux.kernel

Contents

  [PATCH v1] net: phy: fix auto-negotiation stall due to unavailable interrupt Alexander Kochetkov <al.kochet@gmail.com> - 2017-04-20 13:10 +0200
    [PATCH v1] net: phy: fix auto-negotiation stall due to unavailable interrupt Alexander Kochetkov <al.kochet@gmail.com> - 2017-04-20 13:10 +0200
      Re: [PATCH v1] net: phy: fix auto-negotiation stall due to unavailable interrupt Alexander Kochetkov <al.kochet@gmail.com> - 2017-04-20 17:40 +0200
      Re: [PATCH v1] net: phy: fix auto-negotiation stall due to  unavailable interrupt Roger Quadros <rogerq@ti.com> - 2017-04-21 16:20 +0200
        Re: [PATCH v1] net: phy: fix auto-negotiation stall due to unavailable interrupt Alexander Kochetkov <al.kochet@gmail.com> - 2017-04-21 21:00 +0200

#1627318 — [PATCH v1] net: phy: fix auto-negotiation stall due to unavailable interrupt

Hello Florian, Roger and Madalin!

This is slightly modified version of previous patch[1].

It take into account that phy_start_aneg() may be called from
differend places not only from PHY state machine. So the patch
use phy_trigger_machine() to schedule link state update
correctly.

I borrow some text from Roger's commit message.

Added 'Cc: stable <stable@vger.kernel.org> tag'
because the problem exist on 4.9 and 4.10 branches.

Don't know what commit brake the code, so I don't add
Fixes tag.

Roger, could you please test this one patch?

Madalin, I found, that you tested Roger’s patch[2] and this
one patch will get upstream instead of patch[2]. Could you
please test it?

Regards,
Alexander.

[1] http://patchwork.ozlabs.org/patch/743773/
[2] https://lkml.org/lkml/2017/3/30/517

Alexander Kochetkov (1):
  net: phy: fix auto-negotiation stall due to unavailable interrupt

 drivers/net/phy/phy.c |   40 ++++++++++++++++++++++++++++++++++++----
 include/linux/phy.h   |    1 +
 2 files changed, 37 insertions(+), 4 deletions(-)

-- 
1.7.9.5

[toc] | [next] | [standalone]

#1627331

The Ethernet link on an interrupt driven PHY was not coming up if the Ethernet
cable was plugged before the Ethernet interface was brought up.

The patch trigger PHY state machine to update link state if PHY was requested to
do auto-negotiation and auto-negotiation complete flag already set.

During power-up cycle the PHY do auto-negotiation, generate interrupt and set
auto-negotiation complete flag. Interrupt is handled by PHY state machine but
doesn't update link state because PHY is in PHY_READY state. After some time
MAC bring up, start and request PHY to do auto-negotiation. If there are no new
settings to advertise genphy_config_aneg() doesn't start PHY auto-negotiation.
PHY continue to stay in auto-negotiation complete state and doesn't fire
interrupt. At the same time PHY state machine expect that PHY started
auto-negotiation and is waiting for interrupt from PHY and it won't get it.

Signed-off-by: Alexander Kochetkov <al.kochet@gmail.com>
Cc: stable <stable@vger.kernel.org> # v4.9+
---
 drivers/net/phy/phy.c |   40 ++++++++++++++++++++++++++++++++++++----
 include/linux/phy.h   |    1 +
 2 files changed, 37 insertions(+), 4 deletions(-)

diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index 7cc1b7d..2d9975b 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -591,16 +591,18 @@ int phy_mii_ioctl(struct phy_device *phydev, struct ifreq *ifr, int cmd)
 EXPORT_SYMBOL(phy_mii_ioctl);
 
 /**
- * phy_start_aneg - start auto-negotiation for this PHY device
+ * phy_start_aneg_priv - start auto-negotiation for this PHY device
  * @phydev: the phy_device struct
+ * @sync: indicate whether we should wait for the workqueue cancelation
  *
  * Description: Sanitizes the settings (if we're not autonegotiating
  *   them), and then calls the driver's config_aneg function.
  *   If the PHYCONTROL Layer is operating, we change the state to
  *   reflect the beginning of Auto-negotiation or forcing.
  */
-int phy_start_aneg(struct phy_device *phydev)
+static int phy_start_aneg_priv(struct phy_device *phydev, bool sync)
 {
+	bool trigger = 0;
 	int err;
 
 	mutex_lock(&phydev->lock);
@@ -625,10 +627,40 @@ int phy_start_aneg(struct phy_device *phydev)
 		}
 	}
 
+	/* Re-schedule a PHY state machine to check PHY status because
+	 * negotiation may already be done and aneg interrupt may not be
+	 * generated.
+	 */
+	if (phy_interrupt_is_valid(phydev) && (phydev->state == PHY_AN)) {
+		err = phy_aneg_done(phydev);
+		if (err > 0) {
+			trigger = true;
+			err = 0;
+		}
+	}
+
 out_unlock:
 	mutex_unlock(&phydev->lock);
+
+	if (trigger)
+		phy_trigger_machine(phydev, sync);
+
 	return err;
 }
+
+/**
+ * phy_start_aneg - start auto-negotiation for this PHY device
+ * @phydev: the phy_device struct
+ *
+ * Description: Sanitizes the settings (if we're not autonegotiating
+ *   them), and then calls the driver's config_aneg function.
+ *   If the PHYCONTROL Layer is operating, we change the state to
+ *   reflect the beginning of Auto-negotiation or forcing.
+ */
+int phy_start_aneg(struct phy_device *phydev)
+{
+	return phy_start_aneg_priv(phydev, true);
+}
 EXPORT_SYMBOL(phy_start_aneg);
 
 /**
@@ -656,7 +688,7 @@ void phy_start_machine(struct phy_device *phydev)
  *   state machine runs.
  */
 
-static void phy_trigger_machine(struct phy_device *phydev, bool sync)
+void phy_trigger_machine(struct phy_device *phydev, bool sync)
 {
 	if (sync)
 		cancel_delayed_work_sync(&phydev->state_queue);
@@ -1151,7 +1183,7 @@ void phy_state_machine(struct work_struct *work)
 	mutex_unlock(&phydev->lock);
 
 	if (needs_aneg)
-		err = phy_start_aneg(phydev);
+		err = phy_start_aneg_priv(phydev, false);
 	else if (do_suspend)
 		phy_suspend(phydev);
 
diff --git a/include/linux/phy.h b/include/linux/phy.h
index 7fc1105..b19ae66 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -840,6 +840,7 @@ int phy_drivers_register(struct phy_driver *new_driver, int n,
 void phy_mac_interrupt(struct phy_device *phydev, int new_link);
 void phy_start_machine(struct phy_device *phydev);
 void phy_stop_machine(struct phy_device *phydev);
+void phy_trigger_machine(struct phy_device *phydev, bool sync);
 int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd);
 int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd);
 int phy_ethtool_ksettings_get(struct phy_device *phydev,
-- 
1.7.9.5

[toc] | [prev] | [next] | [standalone]

#1627602

Hi, Alexandre!

Just found that you've fixed similar problem for Micrel PHY:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=99f81afc139c6edd14d77a91ee91685a414a1c66

Could you please test if my patch[1] fix your problem?

As reverting your patch will speedup MAC startup time for boards with Micrel PHY
on 3~5 sec (auto-negotiation time[2]). Could you check that also?

Regards,
Alexander.

[1] https://lkml.org/lkml/2017/4/20/357
[2] http://www.ieee802.org/3/af/public/jan02/brown_1_0102.pdf


> 20 апр. 2017 г., в 14:00, Alexander Kochetkov <al.kochet@gmail.com> написал(а):
> 
> The Ethernet link on an interrupt driven PHY was not coming up if the Ethernet
> cable was plugged before the Ethernet interface was brought up.
> 
> The patch trigger PHY state machine to update link state if PHY was requested to
> do auto-negotiation and auto-negotiation complete flag already set.
> 
> During power-up cycle the PHY do auto-negotiation, generate interrupt and set
> auto-negotiation complete flag. Interrupt is handled by PHY state machine but
> doesn't update link state because PHY is in PHY_READY state. After some time
> MAC bring up, start and request PHY to do auto-negotiation. If there are no new
> settings to advertise genphy_config_aneg() doesn't start PHY auto-negotiation.
> PHY continue to stay in auto-negotiation complete state and doesn't fire
> interrupt. At the same time PHY state machine expect that PHY started
> auto-negotiation and is waiting for interrupt from PHY and it won't get it.
> 
> Signed-off-by: Alexander Kochetkov <al.kochet@gmail.com>
> Cc: stable <stable@vger.kernel.org> # v4.9+
> ---
> drivers/net/phy/phy.c |   40 ++++++++++++++++++++++++++++++++++++----
> include/linux/phy.h   |    1 +
> 2 files changed, 37 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
> index 7cc1b7d..2d9975b 100644
> --- a/drivers/net/phy/phy.c
> +++ b/drivers/net/phy/phy.c
> @@ -591,16 +591,18 @@ int phy_mii_ioctl(struct phy_device *phydev, struct ifreq *ifr, int cmd)
> EXPORT_SYMBOL(phy_mii_ioctl);
> 
> /**
> - * phy_start_aneg - start auto-negotiation for this PHY device
> + * phy_start_aneg_priv - start auto-negotiation for this PHY device
>  * @phydev: the phy_device struct
> + * @sync: indicate whether we should wait for the workqueue cancelation
>  *
>  * Description: Sanitizes the settings (if we're not autonegotiating
>  *   them), and then calls the driver's config_aneg function.
>  *   If the PHYCONTROL Layer is operating, we change the state to
>  *   reflect the beginning of Auto-negotiation or forcing.
>  */
> -int phy_start_aneg(struct phy_device *phydev)
> +static int phy_start_aneg_priv(struct phy_device *phydev, bool sync)
> {
> +	bool trigger = 0;
> 	int err;
> 
> 	mutex_lock(&phydev->lock);
> @@ -625,10 +627,40 @@ int phy_start_aneg(struct phy_device *phydev)
> 		}
> 	}
> 
> +	/* Re-schedule a PHY state machine to check PHY status because
> +	 * negotiation may already be done and aneg interrupt may not be
> +	 * generated.
> +	 */
> +	if (phy_interrupt_is_valid(phydev) && (phydev->state == PHY_AN)) {
> +		err = phy_aneg_done(phydev);
> +		if (err > 0) {
> +			trigger = true;
> +			err = 0;
> +		}
> +	}
> +
> out_unlock:
> 	mutex_unlock(&phydev->lock);
> +
> +	if (trigger)
> +		phy_trigger_machine(phydev, sync);
> +
> 	return err;
> }
> +
> +/**
> + * phy_start_aneg - start auto-negotiation for this PHY device
> + * @phydev: the phy_device struct
> + *
> + * Description: Sanitizes the settings (if we're not autonegotiating
> + *   them), and then calls the driver's config_aneg function.
> + *   If the PHYCONTROL Layer is operating, we change the state to
> + *   reflect the beginning of Auto-negotiation or forcing.
> + */
> +int phy_start_aneg(struct phy_device *phydev)
> +{
> +	return phy_start_aneg_priv(phydev, true);
> +}
> EXPORT_SYMBOL(phy_start_aneg);
> 
> /**
> @@ -656,7 +688,7 @@ void phy_start_machine(struct phy_device *phydev)
>  *   state machine runs.
>  */
> 
> -static void phy_trigger_machine(struct phy_device *phydev, bool sync)
> +void phy_trigger_machine(struct phy_device *phydev, bool sync)
> {
> 	if (sync)
> 		cancel_delayed_work_sync(&phydev->state_queue);
> @@ -1151,7 +1183,7 @@ void phy_state_machine(struct work_struct *work)
> 	mutex_unlock(&phydev->lock);
> 
> 	if (needs_aneg)
> -		err = phy_start_aneg(phydev);
> +		err = phy_start_aneg_priv(phydev, false);
> 	else if (do_suspend)
> 		phy_suspend(phydev);
> 
> diff --git a/include/linux/phy.h b/include/linux/phy.h
> index 7fc1105..b19ae66 100644
> --- a/include/linux/phy.h
> +++ b/include/linux/phy.h
> @@ -840,6 +840,7 @@ int phy_drivers_register(struct phy_driver *new_driver, int n,
> void phy_mac_interrupt(struct phy_device *phydev, int new_link);
> void phy_start_machine(struct phy_device *phydev);
> void phy_stop_machine(struct phy_device *phydev);
> +void phy_trigger_machine(struct phy_device *phydev, bool sync);
> int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd);
> int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd);
> int phy_ethtool_ksettings_get(struct phy_device *phydev,
> -- 
> 1.7.9.5
> 

[toc] | [prev] | [next] | [standalone]

#1628310 — Re: [PATCH v1] net: phy: fix auto-negotiation stall due to unavailable interrupt

On 20/04/17 14:00, Alexander Kochetkov wrote:
> The Ethernet link on an interrupt driven PHY was not coming up if the Ethernet
> cable was plugged before the Ethernet interface was brought up.
> 
> The patch trigger PHY state machine to update link state if PHY was requested to
> do auto-negotiation and auto-negotiation complete flag already set.
> 
> During power-up cycle the PHY do auto-negotiation, generate interrupt and set
> auto-negotiation complete flag. Interrupt is handled by PHY state machine but
> doesn't update link state because PHY is in PHY_READY state. After some time
> MAC bring up, start and request PHY to do auto-negotiation. If there are no new
> settings to advertise genphy_config_aneg() doesn't start PHY auto-negotiation.
> PHY continue to stay in auto-negotiation complete state and doesn't fire
> interrupt. At the same time PHY state machine expect that PHY started
> auto-negotiation and is waiting for interrupt from PHY and it won't get it.
> 
> Signed-off-by: Alexander Kochetkov <al.kochet@gmail.com>
> Cc: stable <stable@vger.kernel.org> # v4.9+

Tested-by: Roger Quadros <rogerq@ti.com>

I think the following commit broke functionality with interrupt driven PHYs
3c293f4e08b5 ("net: phy: Trigger state machine on state change and not polling.")

cheers,
-roger

> ---
>  drivers/net/phy/phy.c |   40 ++++++++++++++++++++++++++++++++++++----
>  include/linux/phy.h   |    1 +
>  2 files changed, 37 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
> index 7cc1b7d..2d9975b 100644
> --- a/drivers/net/phy/phy.c
> +++ b/drivers/net/phy/phy.c
> @@ -591,16 +591,18 @@ int phy_mii_ioctl(struct phy_device *phydev, struct ifreq *ifr, int cmd)
>  EXPORT_SYMBOL(phy_mii_ioctl);
>  
>  /**
> - * phy_start_aneg - start auto-negotiation for this PHY device
> + * phy_start_aneg_priv - start auto-negotiation for this PHY device
>   * @phydev: the phy_device struct
> + * @sync: indicate whether we should wait for the workqueue cancelation
>   *
>   * Description: Sanitizes the settings (if we're not autonegotiating
>   *   them), and then calls the driver's config_aneg function.
>   *   If the PHYCONTROL Layer is operating, we change the state to
>   *   reflect the beginning of Auto-negotiation or forcing.
>   */
> -int phy_start_aneg(struct phy_device *phydev)
> +static int phy_start_aneg_priv(struct phy_device *phydev, bool sync)
>  {
> +	bool trigger = 0;
>  	int err;
>  
>  	mutex_lock(&phydev->lock);
> @@ -625,10 +627,40 @@ int phy_start_aneg(struct phy_device *phydev)
>  		}
>  	}
>  
> +	/* Re-schedule a PHY state machine to check PHY status because
> +	 * negotiation may already be done and aneg interrupt may not be
> +	 * generated.
> +	 */
> +	if (phy_interrupt_is_valid(phydev) && (phydev->state == PHY_AN)) {
> +		err = phy_aneg_done(phydev);
> +		if (err > 0) {
> +			trigger = true;
> +			err = 0;
> +		}
> +	}
> +
>  out_unlock:
>  	mutex_unlock(&phydev->lock);
> +
> +	if (trigger)
> +		phy_trigger_machine(phydev, sync);
> +
>  	return err;
>  }
> +
> +/**
> + * phy_start_aneg - start auto-negotiation for this PHY device
> + * @phydev: the phy_device struct
> + *
> + * Description: Sanitizes the settings (if we're not autonegotiating
> + *   them), and then calls the driver's config_aneg function.
> + *   If the PHYCONTROL Layer is operating, we change the state to
> + *   reflect the beginning of Auto-negotiation or forcing.
> + */
> +int phy_start_aneg(struct phy_device *phydev)
> +{
> +	return phy_start_aneg_priv(phydev, true);
> +}
>  EXPORT_SYMBOL(phy_start_aneg);
>  
>  /**
> @@ -656,7 +688,7 @@ void phy_start_machine(struct phy_device *phydev)
>   *   state machine runs.
>   */
>  
> -static void phy_trigger_machine(struct phy_device *phydev, bool sync)
> +void phy_trigger_machine(struct phy_device *phydev, bool sync)
>  {
>  	if (sync)
>  		cancel_delayed_work_sync(&phydev->state_queue);
> @@ -1151,7 +1183,7 @@ void phy_state_machine(struct work_struct *work)
>  	mutex_unlock(&phydev->lock);
>  
>  	if (needs_aneg)
> -		err = phy_start_aneg(phydev);
> +		err = phy_start_aneg_priv(phydev, false);
>  	else if (do_suspend)
>  		phy_suspend(phydev);
>  
> diff --git a/include/linux/phy.h b/include/linux/phy.h
> index 7fc1105..b19ae66 100644
> --- a/include/linux/phy.h
> +++ b/include/linux/phy.h
> @@ -840,6 +840,7 @@ int phy_drivers_register(struct phy_driver *new_driver, int n,
>  void phy_mac_interrupt(struct phy_device *phydev, int new_link);
>  void phy_start_machine(struct phy_device *phydev);
>  void phy_stop_machine(struct phy_device *phydev);
> +void phy_trigger_machine(struct phy_device *phydev, bool sync);
>  int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd);
>  int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd);
>  int phy_ethtool_ksettings_get(struct phy_device *phydev,
> 

[toc] | [prev] | [next] | [standalone]

#1628508

> 21 апр. 2017 г., в 17:18, Roger Quadros <rogerq@ti.com> написал(а):
> 
> I think the following commit broke functionality with interrupt driven PHYs
> 3c293f4e08b5 ("net: phy: Trigger state machine on state change and not polling.")

Probably this one[1] broke, according to Alexandre’s commit[2].
And it was since Nov 16 2015. But it was hidden by some other commits.

For Roger problem became visible after 3c293f4e08b5 ("net: phy:
Trigger state machine on state change and not polling.»),

For my problem became visible after 529ed1275263 ("net: phy: phy drivers
should not set SUPPORTED_[Asym_]Pause»). As commit 529ed1275263 
removed SUPPORTED_Pause flag from PHY advertising property and
genphy_config_aneg() began to skip PHY auto-negotiation.

Alexander.

[1] Fixes: 321beec5047a (net: phy: Use interrupts when available in NOLINK state)
     https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=321beec5047af83db90c88114b7e664b156f49fe
[2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=99f81afc139c6edd14d77a91ee91685a414a1c66

[toc] | [prev] | [standalone]

Back to top | Article view | linux.kernel

csiph-web