net: dsa: microchip: Fix KSZ9477 HSR port setup issue

[PATCH net] net: dsa: microchip: Fix KSZ9477 HSR port setup issue

Posted by Tristram.Ha@microchip.com 1 month, 2 weeks ago

From: Tristram Ha <tristram.ha@microchip.com>

ksz9477_hsr_join() is called once to setup the HSR port membership, but
the port can be enabled later, or disabled and enabled back and the port
membership is not set correctly inside ksz_update_port_member().  The
added code always use the correct HSR port membership for HSR port that
is enabled.

Fixes: 2d61298fdd7b ("net: dsa: microchip: Enable HSR offloading for KSZ9477")
Reported-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Signed-off-by: Tristram Ha <tristram.ha@microchip.com>
---
 drivers/net/dsa/microchip/ksz_common.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index 4cb14288ff0f..9568cc391fe3 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -2457,6 +2457,12 @@ static void ksz_update_port_member(struct ksz_device *dev, int port)
 		dev->dev_ops->cfg_port_member(dev, i, val | cpu_port);
 	}
 
+	/* HSR ports are setup once so need to use the assigned membership
+	 * when the port is enabled.
+	 */
+	if (!port_member && p->stp_state == BR_STATE_FORWARDING &&
+	    (dev->hsr_ports & BIT(port)))
+		port_member = dev->hsr_ports;
 	dev->dev_ops->cfg_port_member(dev, port, port_member | cpu_port);
 }
 
-- 
2.34.1

Re: [PATCH net] net: dsa: microchip: Fix KSZ9477 HSR port setup issue

Posted by Frieder Schrempf 1 month, 2 weeks ago

Am 19.08.25 um 03:04 schrieb Tristram.Ha@microchip.com:
> From: Tristram Ha <tristram.ha@microchip.com>
> 
> ksz9477_hsr_join() is called once to setup the HSR port membership, but
> the port can be enabled later, or disabled and enabled back and the port
> membership is not set correctly inside ksz_update_port_member().  The
> added code always use the correct HSR port membership for HSR port that
> is enabled.
> 
> Fixes: 2d61298fdd7b ("net: dsa: microchip: Enable HSR offloading for KSZ9477")
> Reported-by: Frieder Schrempf <frieder.schrempf@kontron.de>
> Signed-off-by: Tristram Ha <tristram.ha@microchip.com>

Tested-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Reviewed-by: Frieder Schrempf <frieder.schrempf@kontron.de>

> ---
>  drivers/net/dsa/microchip/ksz_common.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
> index 4cb14288ff0f..9568cc391fe3 100644
> --- a/drivers/net/dsa/microchip/ksz_common.c
> +++ b/drivers/net/dsa/microchip/ksz_common.c
> @@ -2457,6 +2457,12 @@ static void ksz_update_port_member(struct ksz_device *dev, int port)
>  		dev->dev_ops->cfg_port_member(dev, i, val | cpu_port);
>  	}
>  
> +	/* HSR ports are setup once so need to use the assigned membership
> +	 * when the port is enabled.
> +	 */
> +	if (!port_member && p->stp_state == BR_STATE_FORWARDING &&
> +	    (dev->hsr_ports & BIT(port)))
> +		port_member = dev->hsr_ports;
>  	dev->dev_ops->cfg_port_member(dev, port, port_member | cpu_port);
>  }
>

Re: [PATCH net] net: dsa: microchip: Fix KSZ9477 HSR port setup issue

Posted by Łukasz Majewski 1 month, 2 weeks ago

On Mon, 18 Aug 2025 18:04:57 -0700
<Tristram.Ha@microchip.com> wrote:

> From: Tristram Ha <tristram.ha@microchip.com>
> 
> ksz9477_hsr_join() is called once to setup the HSR port membership,
> but the port can be enabled later, or disabled and enabled back and
> the port membership is not set correctly inside
> ksz_update_port_member().  The added code always use the correct HSR
> port membership for HSR port that is enabled.
> 
> Fixes: 2d61298fdd7b ("net: dsa: microchip: Enable HSR offloading for
> KSZ9477") Reported-by: Frieder Schrempf <frieder.schrempf@kontron.de>
> Signed-off-by: Tristram Ha <tristram.ha@microchip.com>
> ---
>  drivers/net/dsa/microchip/ksz_common.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/net/dsa/microchip/ksz_common.c
> b/drivers/net/dsa/microchip/ksz_common.c index
> 4cb14288ff0f..9568cc391fe3 100644 ---
> a/drivers/net/dsa/microchip/ksz_common.c +++
> b/drivers/net/dsa/microchip/ksz_common.c @@ -2457,6 +2457,12 @@
> static void ksz_update_port_member(struct ksz_device *dev, int port)
> dev->dev_ops->cfg_port_member(dev, i, val | cpu_port); }
>  
> +	/* HSR ports are setup once so need to use the assigned
> membership
> +	 * when the port is enabled.
> +	 */
> +	if (!port_member && p->stp_state == BR_STATE_FORWARDING &&
> +	    (dev->hsr_ports & BIT(port)))
> +		port_member = dev->hsr_ports;
>  	dev->dev_ops->cfg_port_member(dev, port, port_member |
> cpu_port); }
>  

Reviewed-by: Łukasz Majewski <lukma@nabladev.com>

-- 
Best regards,

Lukasz Majewski

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